CN218408214U - Main shaft connecting structure of fan - Google Patents
Main shaft connecting structure of fan Download PDFInfo
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- CN218408214U CN218408214U CN202221752131.1U CN202221752131U CN218408214U CN 218408214 U CN218408214 U CN 218408214U CN 202221752131 U CN202221752131 U CN 202221752131U CN 218408214 U CN218408214 U CN 218408214U
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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 force application surface groove structure is configured into a hollow cylinder, and the end surface of the hollow cylinder is provided with a concentric annular groove; a main shaft 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 force-applying surface groove structure and the spindle.
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.
SUMMERY OF THE UTILITY MODEL
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 solve the technical problem, the utility model provides a fan main shaft connection structure, include:
the force application surface groove structure is configured into a hollow cylinder, and a concentric annular groove is formed in the end face of the hollow cylinder;
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
and the axial pretension structure is configured to provide an axial tensioning force between the force application surface groove structure 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 spindle connecting structure, the force application surface groove structure includes:
the gear box input shaft is configured to form an inner ring connection matching surface on the outer side surface of the gear box input shaft; and
a locking outer ring configured such that an inner side surface thereof constitutes an outer ring connection mating surface;
the input shaft of the gear box is arranged on the inner periphery, the locking outer ring is arranged on the periphery, and the input shaft and the locking outer ring radially surround to form an acting surface groove structure.
Optionally, in the fan main shaft connecting structure, the gear box input shaft includes:
the outer side surface of the first hollow cylindrical section forms an inner ring connection matching surface;
a second hollow cylindrical section having an outer diameter greater than the outer diameter of the first hollow cylindrical section; and
and the third hollow cylindrical section is positioned at one end far away from the main shaft.
Optionally, in the fan spindle connection structure, an outer side surface of the first hollow cylindrical section is a conical surface, an outer diameter of the first hollow cylindrical section gradually increases from an end surface of the hollow cylinder to the second hollow cylindrical section, and an inner 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 first hollow cylindrical section have 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 spindle connecting structure, the outer side surface of the first hollow cylindrical section is provided with a first annular protrusion structure;
the inner side surface of the locking outer ring is provided with a second annular protrusion structure;
the axial pre-tightening tension structure is a locking bolt, and the locking bolt penetrates through the end face of the main shaft after sequentially penetrating through the first annular protrusion structure and the second annular protrusion structure.
Optionally, in the fan main shaft 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 reduced from the end surface with the groove to the second annular protrusion structure, 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.
Optionally, in the connection structure of the main shaft of the wind turbine, the main shaft further includes:
the irregular column section is formed by splicing a plurality of conical surfaces, stepped cylindrical surfaces and arc surfaces on the outer side surface and the inner side surface.
Optionally, in the fan spindle connection structure, an inner axial tangent and an outer axial tangent of the circular cylinder and an inner axial tangent of the first hollow cylindrical section both have an included angle of 0 to 20 °.
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 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 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 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 locking disc is connected to the spindle 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.
Based on above insights, the utility model provides a fan main shaft connection structure through removing the locking dish inner ring, only adopts the conical surface and the main shaft interference of locking outer loop to be connected, can strengthen main shaft (foundry goods main shaft) rigidity even, and is further, with main shaft and gear box input shaft (planet carrier) conical surface interference fit, then the main shaft has two interference fit and realizes passing and turn round, has increased the biography ability of turning round. The main shaft and the locking outer ring form an interference fit torque transmission structure of the locking outer ring, the main shaft and the input end of the gear box form an interference fit torque transmission structure of the locking inner ring, the conical surfaces of the main shaft and the input end of the gear box are flattened through the locking bolt, and under the action of conical surface fit, positive pressure is generated to inhibit slipping between the main shaft and the gear box. The invention has the following advantages:
one locking disc inner ring component is reduced, torque transmission is achieved 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 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;
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 provided by the present invention is further 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 a very simplified form and are not to precise scale, which is only used for the purpose of facilitating and clearly explaining 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: the force application surface groove structure is configured into a hollow cylinder, and a concentric annular groove is formed in the end face of the hollow cylinder; 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 force-applying surface groove structure and the spindle.
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: the force surface groove structure (comprising the gearbox input shaft 12 and the locking outer ring 16) is configured as a hollow cylinder, and the end surface of the hollow cylinder is provided with a concentric annular groove; 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 force-facing groove structure and the spindle.
In this embodiment, the connection structure is connected with the main shaft 11 side through the outer ring auxiliary ferrule (locking outer ring 16) to form a locking outer ring with higher rigidity, the inner ring on the planet carrier side (gear box input shaft 12) and the outer ring on the main shaft 11 bearing side generate axial displacement and radial interference through the locking bolt 13, torque is transmitted by using the radial pressure and the anti-sliding capability of the cone interference matching surface, and the transmission chain structure which is beneficial to installation and maintenance from the gear box is realized.
The outer ring of the cone interference fit surface is positioned on the main shaft side; the inner ring of the cone interference fit surface is positioned on the low-speed spindle side. The locking bolt 13 is pre-tightened from the gear box side; the required axial pre-tightening tension is low, and the number of bolts is small. The diameter is subject to main shaft bearing internal diameter in the fitting surface, compares traditional scheme and promotes great, and transmission torque capacity is bigger. The embodiment is suitable for the connection scheme of a pneumatic low-speed main shaft and a gear box, the number of bolts is enough, the low-speed shaft and the gear box are in direct interference connection and mutually support, and torque transmission is achieved.
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 fitting surface 142 is in interference fit with the outer ring connecting fitting surface 142.
Furthermore, in the fan spindle connecting structure, the force application surface groove structure includes: a gear box input shaft 12 configured such that an outer side surface thereof constitutes an inner ring connection mating surface 141; and a lock outer ring 16 configured such that an inner side surface thereof constitutes a cup joint mating 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 force application surface groove structure. In the fan main shaft connecting structure, as shown in fig. 5, the gear box input shaft includes: a first hollow cylindrical section 121, the outer side of which forms an inner ring connection mating surface; a second hollow cylindrical section 122 having an outer diameter greater than the outer diameter of the first hollow cylindrical section; and a third hollow cylindrical section 123 at an end remote from the main shaft.
In order to form 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 conical surface, the outer diameter of the first hollow cylindrical section is gradually increased from the end surface of the hollow cylinder 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 reduced from the end surface with the groove to the second annular protrusion structure, 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, wherein the optimal angle is 2-10 degrees. In the connecting structure of the fan main shaft, an inner axial tangent and an outer axial tangent of the circular cylinder body and an inner axial tangent of the first hollow cylinder section both have included angles of 0-20 degrees, wherein the optimal angle is 2-10 degrees.
In order to realize interference between the two interference matching surfaces, axial tension needs to be provided between the main shaft and the force application surface groove structure, so that the main shaft and the force application surface groove structure are as close as possible, and in the fan main shaft connecting structure, as shown in fig. 5, the outer side surface of the first hollow cylindrical section is provided with a first annular protrusion structure 124; as shown in fig. 6, the inner side surface of the lock outer ring has a second annular projection structure 161; the axial pretension structure is a locking bolt 13, and the locking bolt 13 passes through the first annular protrusion structure 124 and the second annular protrusion structure 161 in sequence and then passes through the end surface 112 of the spindle 11.
Firstly, an outer ring auxiliary ferrule (a locking outer ring 16) is placed on a low-speed main shaft 11, the low-speed main shaft 11 or a gearbox input shaft 12 is fixed, the gearbox input shaft 12 or the low-speed main shaft 11 is gradually moved along a cone interference fit surface through the pre-tightening of a locking bolt 13, and the purpose of interference torque transmission is achieved when no axial gap exists between the low-speed main shaft 11 and the gearbox input shaft 12 (a planet carrier). 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 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 addition, in the connection structure of the main shaft of the wind turbine, as shown in fig. 4, the main shaft further includes: the irregular cylindrical section 111 is configured by splicing a plurality of conical surfaces, stepped cylindrical surfaces, and arc surfaces on the outer side surface and the inner side surface.
To sum up the utility model provides a fan main shaft connection structure, through removing the locking dish inner ring, only adopt the conical surface and the main shaft interference of locking outer loop to be connected, can strengthen main shaft (foundry goods main shaft) rigidity even, further, with main shaft and gear box input shaft (planet carrier) conical surface interference fit, then the main shaft has two interference fit and realizes passing the turn round, has increased and has passed the ability of turning round. The main shaft and the locking outer ring form an interference fit torque transmission structure of the locking outer ring, the main shaft and the input end of the gear box form an interference fit torque transmission structure of the locking inner ring, the main shaft and the conical surface of the input end of the gear box are leveled through the locking bolt, and positive pressure is generated under the matching action of the conical surfaces to inhibit slipping between the main shaft and the gear box. The invention has the following advantages:
one locking disc inner ring component is reduced, torque transmission is achieved 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.
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:
the force application surface groove structure is configured into a hollow cylinder, and the end surface of the hollow cylinder is provided with a concentric annular groove;
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
and the axial pre-tensioning force structure is configured to provide an axial tensioning force between the force application surface groove structure 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 force surface groove structure comprises:
a gear box input shaft configured such that an outer side surface thereof constitutes an inner ring connection mating surface; and
a locking outer ring configured such that an inner side surface thereof constitutes an outer ring connection mating surface;
the input shaft of the gear box is arranged on the inner periphery, the locking outer ring is arranged on the periphery, and the input shaft and the locking outer ring radially surround to form an acting surface groove structure.
4. The wind turbine main shaft connection structure of claim 3, wherein the gearbox input shaft comprises:
the outer side surface of the first hollow cylindrical section forms an inner ring connection matching surface;
a second hollow cylindrical section having an outer diameter greater than the outer diameter of the first hollow cylindrical section; and
and the third hollow cylindrical section is positioned at one end far away from the main shaft.
5. The main shaft connecting structure of a blower according to claim 4, wherein the outer side surface of the first hollow cylindrical section is a tapered surface, the outer diameter of the first hollow cylindrical section gradually increases from the end surface of the hollow cylinder to the second hollow cylindrical section, and the inner 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 first hollow cylindrical section have an included angle of 0-20 degrees.
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 first hollow cylindrical section;
wherein the center of the inner ring bushing also has a lightening hole.
7. The connecting structure for the main shaft of the wind turbine according to claim 5, wherein the outer side surface of the first hollow cylindrical section is provided with a first annular protrusion structure;
the inner side surface of the locking outer ring is provided with a second annular protrusion structure;
the axial pre-tightening tension structure is a locking bolt, and the locking bolt penetrates through the end face of the main shaft after sequentially penetrating through the first annular protruding structure and the second annular protruding structure.
8. The wind turbine main shaft connecting structure according to claim 7,
the inner side surface of the locking outer ring is a conical surface, the inner diameter of the locking outer ring is gradually reduced from the end surface with the groove to the second annular protrusion structure, 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.
9. The fan main shaft connecting structure according to claim 3, wherein the main shaft further comprises:
the irregular column section is formed by splicing a plurality of conical surfaces, stepped cylindrical surfaces and arc surfaces on the outer side surface and the inner side surface.
10. The main shaft connecting structure of a wind turbine according to claim 3, wherein the inner axial tangent and the outer axial tangent of the circular cylindrical body and the inner axial tangent of the first hollow cylindrical section each have an included angle of 0 to 20 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221752131.1U CN218408214U (en) | 2022-07-08 | 2022-07-08 | Main shaft connecting structure of fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221752131.1U CN218408214U (en) | 2022-07-08 | 2022-07-08 | Main shaft connecting structure of fan |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218408214U true CN218408214U (en) | 2023-01-31 |
Family
ID=85012006
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221752131.1U Active CN218408214U (en) | 2022-07-08 | 2022-07-08 | Main shaft connecting structure of fan |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218408214U (en) |
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2022
- 2022-07-08 CN CN202221752131.1U patent/CN218408214U/en active Active
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