High-temperature-resistant long shaft fan

Abstract

The utility model relates to fan equipment technical field, concretely is high temperature resistant lengthened shaft fan, including motor, fan blade, normal temperature axle, high temperature axle, flange, upper bearing seat, lower bearing seat, bolt one, screw hole, bolt two, gasket, nut, cold water pipe, limiting hole, water inlet and water outlet, normal temperature axle and high temperature axle are connected through flange and adopt bolt two, gasket and nut fixed formation quick -detach structure, high temperature axle outside is equipped with upper bearing seat and lower bearing seat, bearing seat inside arrangement cold water pipe, cold water pipe both ends connect water inlet and water outlet and form circulating cooling passageway, and the lower bearing seat bottom sets up limiting hole and fixedly connected with the mounting bottom plate, the utility model discloses through flange heat insulation and water cooling structure solve high temperature conduction and lead to motor overheating and the problem of unstable operation of shaft body, reach stable transmission, strengthen cooling and prolong the service life technical effect.

Description

Technical Field

[0001] This utility model relates to the field of fan equipment technology, and in particular to a high-temperature resistant extended shaft fan. Background Technology

[0002] In high-temperature furnace and kiln heat treatment chemical flue gas purification scenarios, forced air supply and circulating heat exchange are required in high-temperature areas. Traditional fans place the impeller and drive end in relatively close spatial positions, and heat is conducted along the transmission axis to the motor side. When the motor's heat dissipation conditions are limited, insulation aging and failure will occur. As the axial length increases, the natural frequency of the shaft decreases, and the sway and vibration intensify. Insufficient support stiffness leads to uneven bearing stress and early wear. Long-term high-temperature environment will also cause the lubricating medium to oxidize and deteriorate, which will further amplify wear and noise. Existing water-cooled or air-cooled structures provide local cooling of the base body. The cooling circuit is not closed or the flow channel is unevenly distributed, making it difficult to achieve effective cooling in areas with significant temperature gradients. At the same time, traditional rigid connections will produce coaxiality deviation and additional axial force under the action of thermal expansion and contraction. The maintenance process involves cumbersome disassembly and assembly steps and long downtime. The overall reliability and maintainability cannot meet the requirements of continuous and stable operation.

[0003] Under the combined effects of the aforementioned application environment and failure mechanism, existing technologies urgently need to achieve synergistic optimization in three aspects: power transmission, thermal insulation support, and cooling. This requires constructing a thermally isolated transmission link between the normal temperature end and the high temperature end, setting up a support system that can increase the critical speed of the long shaft and suppress sway, establishing a distributed cooling channel covering the high-temperature concentrated area and forming a circulation path, and introducing structures that are easy to disassemble and assemble at the connection points to shorten the maintenance cycle and improve the continuous stability and safety of the device under high-temperature conditions. Therefore, this utility model proposes a high-temperature resistant extended shaft fan to solve the shortcomings of existing technologies. Utility Model Content

[0004] In view of the problems of existing high-temperature resistant extended shaft fans, such as the single heat dissipation path, heat transfer to the motor leading to overheating and damage, unstable operation of the extended shaft, and difficulty in maintenance and replacement, this utility model aims to provide a high-temperature resistant extended shaft fan with an improved structure that can effectively insulate and cool down while maintaining stable transmission.

[0005] This utility model provides a high-temperature resistant extended shaft fan, including a motor, fan blades, normal temperature shaft, high temperature shaft, flange, upper bearing seat, lower bearing seat, bolt one, screw hole, bolt two, gasket, nut, cold water pipe, limiting hole, water inlet and water outlet, as well as cooling components and support components for achieving cooling and fixation.

[0006] The high-temperature shaft has an upper bearing seat and a lower bearing seat on its outer wall. The two bearing seats form a bearing mounting cavity that surrounds the high-temperature shaft. A cold water pipe is installed outside the cavity. The inlet and outlet of the cold water pipe are fixedly connected to the two ends of the cold water pipe to form a cooling circulation channel.

[0007] The ambient temperature shaft and the high temperature shaft are connected by a flange. The flanges are fastened with bolts, gaskets and nuts to form a quick-release connection structure. The flange structure realizes the separation and thermal isolation of the ambient temperature shaft and the high temperature shaft. The fan blade is fixed to the right end of the high temperature shaft by a key connection structure. The motor drives the ambient temperature shaft to rotate the high temperature shaft and the fan blade to generate air supply and cool the high temperature shaft.

[0008] The upper and lower bearing housings are locked together by bolts through the screw holes to form a clamping structure for the high-temperature shaft. The bottom of the lower bearing housing is provided with a limiting hole, which is fixedly connected to the mounting base to keep the extended shaft running smoothly. The circulating water in the cold water pipe cools the bearing housing and isolates it from the high temperature.

[0009] Preferably, the flange has a quick-release structure, with symmetrically arranged bolt holes and positioning bosses on opposite sides of the flange. The positioning bosses achieve coaxial positioning, and bolts are installed in the bolt holes and locked by washers and nuts, thereby achieving quick assembly and disassembly.

[0010] Preferably, the upper bearing housing and the lower bearing housing clamp the high-temperature shaft to form a fixed support structure, and the contact surface between the two is an arc-shaped mating surface, which improves the uniformity of force distribution and enhances the support stability through surface contact.

[0011] Preferably, the cold water pipe extends axially along the high-temperature axis, and a denser cooling channel is arranged near the high-temperature zone to achieve gradient cooling.

[0012] Preferably, the inlet and outlet are distributed on the left and right sides of the upper and lower bearing housings, forming a flow structure of convection-type circulating cooling water channels to improve heat dissipation efficiency.

[0013] Preferably, the limiting hole at the bottom of the lower bearing housing is fixedly connected to the mounting base plate by anchor bolts, so that the bearing housing remains stable when the fan is running.

[0014] Preferably, bolt one, bolt two, and nuts are all high-temperature resistant fasteners, and the screw holes are symmetrically distributed around the top of the upper bearing seat to ensure uniform locking force.

[0015] Preferably, the ambient temperature shaft is made of heat-resistant steel, the high temperature shaft is made of high temperature alloy, and the flange adopts a pin and bolt composite positioning structure to ensure connection strength and coaxial accuracy under high temperature environment.

[0016] Preferably, the fan blades are fixed to the right end of the high-temperature shaft by a positioning key and a clamping bolt, forming a torque transmission structure for transmitting torque and preventing loosening.

[0017] This utility model has the following beneficial effects: 1. This utility model solves the problem of motor overheating and unstable shaft operation caused by the excessive heat transfer of the extended shaft structure in the prior art under high temperature environment, by setting a quick-release flange connection structure between the normal temperature shaft and the high temperature shaft, and adopting upper and lower bearing seats for support and cold water pipe circulation cooling. It achieves the technical effect of maintaining stable power transmission, effective heat insulation protection and extending the service life of the whole machine under high temperature conditions.

[0018] 2. This utility model solves the problems of low cooling efficiency, high bearing temperature, and vibration displacement during operation of existing fans by arranging cold water pipes inside the upper and lower bearing housings and setting up dense cooling channels in high-temperature areas, while adding limiting holes at the bottom of the lower bearing housing to achieve stable installation. It achieves the technical effects of improving cooling uniformity, enhancing structural stability, and ensuring the long-term safe operation of the fan. Attached Figure Description

[0019] Figure 1 This is a perspective view of the high-temperature resistant extended shaft fan proposed in this utility model; Figure 2 This is a front view of the high-temperature resistant extended shaft fan proposed in this utility model; Figure 3 This is an exploded view of a partial structure of the high-temperature resistant extended shaft fan proposed in this utility model; Figure 4 This is a cross-sectional view of a partial structure of the high-temperature resistant extended shaft fan proposed in this utility model.

[0020] Legend: 1. Motor; 2. Fan blade; 3. Normal temperature shaft; 4. High temperature shaft; 5. Flange; 6. Upper bearing housing; 7. Lower bearing housing; 8. Bolt 1; 9. Screw hole; 10. Bolt 2; 11. Washer; 12. Nut; 13. Cold water pipe; 14. Limiting hole; 15. Water inlet. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are all within the protection scope of this utility model.

[0022] Example: Please refer to Figures 1 to 4This utility model provides a high-temperature resistant extended shaft fan, which aims to solve the problems in the prior art where the extended drive shaft conducts heat to the motor 1 under high temperature environment, causing the motor 1 to overheat and be damaged, as well as the problems of unstable shaft support and poor cooling effect.

[0023] like Figure 1 and Figure 2 As shown, the high-temperature resistant extended shaft fan includes a motor 1, a fan blade 2, a normal temperature shaft 3, a high-temperature shaft 4, a flange 5, an upper bearing seat 6, a lower bearing seat 7, a bolt 1 8, a screw hole 9, a bolt 2 10, a gasket 11, a nut 12, a cold water pipe 13, a limiting hole 14, a water inlet 15, and a water outlet. The motor 1 is mounted on the base plate via a mounting bracket. The output end of the motor 1 is fixedly connected to the normal temperature shaft 3. The right end of the normal temperature shaft 3 is connected to the high-temperature shaft 4 via the flange 5. The flanges 5 are fastened together with bolt 2 10, gasket 11, and nut 12 to form a connection structure that can be quickly disassembled and assembled. The normal temperature shaft 3 is used to transmit the rotational power of the motor 1 to the high-temperature shaft 4, ensuring that the fan blade 2 still operates stably under high-temperature conditions.

[0024] The fan blade 2 is fixed to the right end of the high-temperature shaft 4 via a keyed connection structure. The fan blade 2 is used to output airflow to create a blowing effect. The middle outer wall of the high-temperature shaft 4 is supported by the upper bearing seat 6 and the lower bearing seat 7. The two bearing seats are connected and fixed by bolts 8 passing through the screw holes 9, forming a symmetrical clamping structure to stabilize the position of the long shaft during rotation and prevent the extended shaft from shifting or deforming due to vibration. The upper bearing seat 6 and the lower bearing seat 7 are equipped with a cooling water pipe 13. The two ends of the cooling water pipe 13 are connected to the inlet 15 and the outlet 15, respectively. The inlet 15 is used to introduce external cooling water, and the outlet is used to discharge the heated cooling water, forming a cooling circulation channel, thereby reducing the overall temperature of the high-temperature shaft 4 and the bearing seats, and preventing the high temperature from affecting the normal operation of the room-temperature shaft 3 and the motor 1.

[0025] The bottom of the lower bearing housing 7 is provided with a limiting hole 14. The limiting hole 14 is fixedly connected to the mounting base plate by bolts, so that the lower bearing housing 7 maintains a stable position during operation and prevents the bearing housing from loosening or shifting due to vibration. The entire fan forms a power transmission chain of motor 1, normal temperature shaft 3, flange 5, high temperature shaft 4 and fan blade 2. The upper bearing housing 6 and the lower bearing housing 7 jointly support the high temperature shaft 4. The cold water pipe 13 forms a cooling circuit. The water inlet 15 and the water outlet realize cooling circulation. The limiting hole 14 fixes the overall structure, so that the high temperature resistant extended shaft fan forms an integrated device with complete structure, stable transmission and effective cooling.

[0026] To solve the above technical problems, the core of the technical solution for the high-temperature resistant extended shaft fan is that it includes an upper bearing housing 6 and a lower bearing housing 7, and the upper bearing housing 6 and the lower bearing housing 7 form a specific structural fit and connection relationship. Please refer to Figure 3 and Figure 4The core structure is described in detail below. Both the upper bearing housing 6 and the lower bearing housing 7 are integral metal structures with axially continuous bearing mounting cavities inside. Their outlines are symmetrical. The top of the upper bearing housing 6 has screw holes 9 around its perimeter, and the corresponding position of the top of the lower bearing housing 7 has through holes. Bolts 8 pass through the screw holes 9 and through holes in sequence and are tightened by nuts 12, so that the upper bearing housing 6 and the lower bearing housing 7 are mated and fixedly clamped to hold the high-temperature shaft 4. The high-temperature shaft 4 is rotatably connected to the bearing housing through the bearing in the bearing mounting cavity. After installation, the upper bearing housing 6 and the lower bearing housing 7 form a complete support assembly. A small gap is maintained between the inner wall of the upper bearing housing 6 and the high-temperature shaft 4 to ensure the smooth rotation of the high-temperature shaft 4. The upper bearing housing 6 and the lower bearing housing 7 clamp the high-temperature shaft 4 to form a fixed support structure. The contact surface between the two is an arc-shaped mating surface to enhance the containment of the shaft and the vibration resistance.

[0027] The upper bearing housing 6 and the lower bearing housing 7 are equipped with axially extending cooling water pipes 13. The cooling water pipes 13 are metal heat-conducting pipes, with the left end fixedly connected to the inlet 15 and the right end fixedly connected to the outlet. The cooling water pipes 13 are more densely distributed in the high-temperature area near the right end, which is used to form enhanced cooling in the high-temperature concentrated area. The outer walls of the upper bearing housing 6 and the lower bearing housing 7 are respectively provided with inlet 15 and outlet interfaces to realize the circulation input and output of cooling water. When the cooling water flows along the cooling water pipes 13, it absorbs the heat generated by the high-temperature shaft 4 and bearing housing and is discharged through the outlet, thereby effectively reducing the temperature of the bearing housing and preventing high temperature from damaging the structural components. The cooling water pipes 13 are separated from the bearing mounting cavity by a partition metal wall to prevent coolant from seeping into the bearing cavity and affecting lubrication.

[0028] The bottom of the lower bearing housing 7 is provided with a limiting hole 14, which passes through the base plate and is fixed to the mounting base by bolts, playing the role of overall positioning and limiting. In the assembled state, the upper bearing housing 6 and the lower bearing housing 7 together form a bidirectional support for the high-temperature shaft 4, so that the high-temperature shaft 4 remains coaxial and stable during operation, reducing the eccentric vibration caused by the increase in shaft length. At the same time, the continuous circulation of the cooling water pipe 13 realizes the efficient cooling of the high-temperature shaft 4 and the bearing housing, thereby ensuring the long-term stable operation of the fan in the high-temperature environment.

[0029] Based on the above embodiments, the high-temperature resistant extended shaft fan may also include the following preferred technical solutions. As a preferred embodiment, in order to improve the disassembly and assembly efficiency of the ambient temperature shaft 3 and the high-temperature shaft 4, the flange 5 is set as a quick-release structure. The opposite surfaces of the flange 5 are machined with symmetrically arranged bolt holes and positioning bosses. The positioning bosses achieve precise centering. The bolts 10 are used for connection and are locked with the gasket 11 and nut 12. This allows the flange 5 to maintain a high-strength connection while having a quick disassembly and assembly function. During the disassembly and assembly process, only the nut 12 needs to be loosened to separate the ambient temperature shaft 3 and the high-temperature shaft 4, which facilitates the replacement and maintenance of the high-temperature shaft 4.

[0030] As another preferred embodiment, in order to enhance the operational stability of the high-temperature shaft 4, the contact surface between the upper bearing housing 6 and the lower bearing housing 7 is an arc-shaped mating surface. This surface contact form increases the support area and disperses stress, avoiding local indentations and wear. At the same time, the upper bearing housing 6 and the lower bearing housing 7 are locked together by bolts 8 and screw holes 9 in a symmetrical arrangement, forming a stable clamping structure, ensuring that the high-temperature shaft 4 remains coaxial and stable when running at high speed, and reducing vibration and offset.

[0031] As another preferred embodiment, in order to improve the heat dissipation effect, the cold water pipe 13 extends along the axial direction of the high temperature shaft 4. The density of the cold water pipe 13 gradually increases in the high temperature region near the right end. After the cooling water enters through the inlet 15, it forms a dense flow channel in the high temperature region, absorbs the heat generated by the high temperature shaft 4 during operation, and is discharged through the outlet to form a circulating cooling path, thereby achieving gradient cooling. The inlet 15 and the outlet are distributed on the left and right sides of the upper bearing seat 6 and the lower bearing seat 7, forming a flow direction structure of the convection circulating cooling water channel.

[0032] As another preferred embodiment, in order to further stabilize the installation structure, a limiting hole 14 is provided at the bottom of the lower bearing seat 7. The limiting hole 14 is fixedly connected to the mounting base plate by anchor bolts. After installation, a reliable limiting positioning point is formed to prevent the lower bearing seat 7 from shifting or rotating during the operation of the fan, and to ensure the overall structure is firm.

[0033] As another preferred embodiment, in order to improve the high-temperature durability of the fasteners, bolt 8, bolt 10 and nut 12 are all high-temperature resistant fasteners. The screw holes 9 are symmetrically distributed around the top of the upper bearing seat 6. This multi-point locking method makes the force more uniform, prevents the connection from loosening, and ensures the tight connection of the structure under high temperature environment.

[0034] As another preferred embodiment, in order to enhance the transmission reliability between the high-temperature shaft 4 and the fan blade 2, the fan blade 2 is fixed to the right end of the high-temperature shaft 4 by a positioning key and a clamping bolt, forming a torque transmission structure for transmitting torque and preventing loosening. The positioning key is inserted into the keyway at the end of the high-temperature shaft 4, and the clamping bolt locks the fan blade 2, so that the fan blade 2 and the high-temperature shaft 4 maintain a reliable coaxial connection, avoiding loosening or slippage under long-term high-temperature rotation.

[0035] As another preferred embodiment, in order to ensure the structural strength of the overall connection under high temperature conditions, the normal temperature shaft 3 is made of heat-resistant steel, the high temperature shaft 4 is made of high temperature-resistant alloy material, and the flange 5 adopts a pin and bolt composite positioning structure. The pin is used to achieve precise positioning, and the bolt is used to achieve high-strength fastening, so that the transmission structure remains stable and reliable in the thermal expansion and contraction environment.

[0036] Working principle: When the motor 1 is powered on, the output end of the motor 1 starts to rotate. The ambient temperature shaft 3 is fixedly connected to the output shaft of the motor 1. The rotational power of the motor 1 is transmitted to the flange 5 through the ambient temperature shaft 3. The flange 5 and the high temperature shaft 4 are fastened together by bolts 10, gaskets 11 and nuts 12 to form an integral connection. After the high temperature shaft 4 obtains torque, it drives the fan blade 2 at the right end to rotate. The fan blade 2 is reliably connected to the high temperature shaft 4 through the positioning key and clamping bolt, so that the fan blade 2 and the high temperature shaft 4 rotate synchronously, thereby forming a forced air supply effect. During the rotation process, the fan blade 2 continuously pushes the air flow and generates a stable airflow output to achieve the ventilation and cooling functions. Motor 1 operates at normal temperature. The normal temperature shaft 3 and the high temperature shaft 4 are separated by flange 5. Flange 5 forms a thermal isolation interface, which can effectively block the heat conduction from the high temperature shaft 4 to the normal temperature shaft 3 and motor 1, so that the heat in the high temperature area does not diffuse to the normal temperature end, thereby avoiding overheating damage to motor 1. Flange 5 adopts a pin and bolt composite positioning structure, which ensures good coaxiality while ensuring connection strength, and ensures stable torque transmission. The quick-release structure between the normal temperature shaft 3 and the high temperature shaft 4 makes maintenance and replacement more convenient. When maintenance is required, it can be separated simply by loosening nut 12, reducing maintenance time and improving the reliability of the device. During high-speed rotation, the high-temperature shaft 4 is supported and maintains stable operation by bearings in the upper bearing housing 6 and the lower bearing housing 7. The upper bearing housing 6 and the lower bearing housing 7 adopt an arc-shaped mating surface to form an enclosed structure, ensuring the stability of the shaft center position when the high-temperature shaft 4 rotates and preventing swaying and vibration caused by the extended structure. The upper bearing housing 6 and the lower bearing housing 7 are locked by bolts 8 through screw holes 9 to form a rigid clamping support. The bearings in the bearing mounting cavity reduce frictional resistance through precision fit, enabling the high-temperature shaft 4 to rotate smoothly under the driving force. The bottom of the upper bearing housing 6 and the lower bearing housing 7 are fixedly connected to the mounting base plate through limiting holes 14 and anchor bolts, thereby ensuring that the overall fan will not shift or loosen during operation. The high-temperature shaft 4 will accumulate heat during long-term operation in a high-temperature environment. The upper bearing housing 6 and the lower bearing housing 7 are equipped with a cooling water pipe 13. The left end of the cooling water pipe 13 is fixedly connected to the water inlet 15, and the right end is fixedly connected to the water outlet. After entering from the water inlet 15, the cooling water flows to the right along the cooling water pipe 13. It is densely distributed at the end near the fan blade 2, and the flow rate is accelerated, forming enhanced convection heat transfer. When the cooling water flows through the high-temperature area, it absorbs the heat generated by the high-temperature shaft 4 and the bearing housing, and is discharged through the water outlet to realize the circulating cooling process. The thermal conductivity of the metal of the cooling water pipe 13 makes the cooling more uniform. The high-temperature shaft 4 and the cooling water pipe 13 are separated by a metal partition to prevent condensate from entering the bearing cavity and affecting lubrication. The cooling system can effectively reduce the temperature of the high-temperature shaft 4 under continuous operation, keeping the bearing housing within the safe operating temperature range, thereby ensuring the continuous and stable operation of the fan in a high-temperature environment. When motor 1 drives fan blade 2 to rotate, the airflow generated by fan blade 2 simultaneously dissipates heat from the surrounding equipment. The temperature rise of the high-temperature shaft 4 is continuously carried away by the cooling water flowing inside the cold water pipe 13. The inlet 15 and outlet form a circulating water channel, and the cooling system maintains the shaft temperature stability. The flange 5 structure keeps the normal temperature shaft 3 away from the high-temperature area. The limiting structure of the upper bearing seat 6 and the lower bearing seat 7 ensures axial stability. The entire system forms a working system in which five parts cooperate: motor 1 drive, mechanical transmission, thermal isolation, cooling circulation, and structural limiting. This allows the fan to maintain a reliable working state in the environment of long shaft, high temperature, and high speed, effectively avoiding problems such as shaft deformation, motor 1 overheating, and fan blade 2 instability, and achieving a comprehensive performance of efficient ventilation and long-lasting high temperature resistance.

Claims

1. High-temperature resistant extended shaft fan, including motor (1), fan blade (2), normal temperature shaft (3), high temperature shaft (4), flange (5), upper bearing seat (6), lower bearing seat (7), bolt one (8), screw hole (9), bolt two (10), gasket (11), nut (12), cold water pipe (13), limit hole (14), water inlet (15) and water outlet; Its features are, The ambient temperature shaft (3) and the high temperature shaft (4) are connected by a flange (5). The flange (5) is fastened with bolts (10), gaskets (11) and nuts (12) to form a quick-release structure. The upper bearing seat (6) and the lower bearing seat (7) are installed on the outer wall of the high temperature shaft (4). The upper bearing seat (6) and the lower bearing seat (7) are fixedly clamped by bolts (8) passing through screw holes (9). The upper bearing seat (6) and the lower bearing seat (7) are equipped with cold water pipes (13). The inlet (15) and the outlet are respectively fixedly connected to the two ends of the cold water pipes (13) to form a cooling circulation channel. The bottom of the lower bearing seat (7) is equipped with a limiting hole (14) for installation and positioning. The fan blade (2) is fixed to the right end of the high temperature shaft (4) by a key connection structure. The motor (1) drives the ambient temperature shaft (3) to drive the high temperature shaft (4) and the fan blade (2) to rotate to achieve air supply and cooling of the high temperature shaft (4).

2. The high-temperature resistant extended shaft fan according to claim 1, characterized in that, The flange (5) between the ambient temperature shaft (3) and the high temperature shaft (4) is a quick-release structure. The positioning structure is quickly disassembled and assembled by the symmetrically arranged bolt holes and the positioning boss.

3. The high-temperature resistant extended shaft fan according to claim 1, characterized in that, The upper bearing housing (6) and the lower bearing housing (7) clamp the high-temperature shaft (4) to form a fixed support structure. The contact surface between the two is an arc-shaped mating surface. The extended shaft is stabilized by fastening with bolts (8).

4. The high-temperature resistant extended shaft fan according to claim 1, characterized in that, The cold water pipe (13) is axially arranged along the high temperature axis (4) and the density gradually increases from left to right, which is used to achieve gradient cooling in the high temperature concentrated area.

5. The high-temperature resistant extended shaft fan according to claim 1, characterized in that, The inlet (15) and outlet are located on the left and right sides of the upper bearing housing (6) and the lower bearing housing (7), respectively, forming a flow direction structure of the convection circulating cooling water channel.

6. The high-temperature resistant extended shaft fan according to claim 1, characterized in that, Bolt 1 (8), Bolt 2 (10) and nut (12) are all high temperature resistant fasteners. The screw holes (9) are distributed around the top of the upper bearing seat (6) for uniform force fixation.

7. The high-temperature resistant extended shaft fan according to claim 1, characterized in that, The normal temperature shaft (3) is made of heat-resistant steel, the high temperature shaft (4) is made of high temperature alloy, and the flange (5) adopts a composite connection with a pin and bolt positioning structure to ensure reliable connection under high temperature operation.

8. The high-temperature resistant extended shaft fan according to claim 1, characterized in that, A positioning key and a clamping bolt are provided between the fan blade (2) and the high-temperature shaft (4) to form a torque transmission structure for transmitting torque and preventing loosening.

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