Fan capable of preventing impeller from loosening

Abstract

The invention provides a fan capable of preventing an impeller from loosening, and relates to the field of fans, the fan comprises a main shaft, the impeller mounted on the main shaft, a shell for accommodating the impeller, a driving device, an anti-loosening mechanism and a transmission isolation mechanism; the anti-loosening mechanism comprises a centrifugal triggering assembly and an axial locking assembly. The centrifugal triggering assembly comprises a mounting base and a centrifugal sliding block, the mounting base is arranged on the impeller, and the centrifugal sliding block is arranged on the mounting base; the axial locking assembly comprises a force bearing seat and a centrifugal pressing block, the force bearing seat is arranged on the main shaft and located on the axial side of the impeller, and the centrifugal pressing block is movably arranged on the force bearing seat. The transmission isolation mechanism comprises a flexible coupler and a supporting bearing set, the flexible coupler is arranged between the driving device and the main shaft, and the supporting bearing set is arranged between the machine shell and the main shaft. The impeller is actively and dynamically prevented from loosening, and through systematic design, the operation stability, the safety reliability and the maintenance convenience of the fan under complex working conditions are remarkably improved.

Description

A fan to prevent impeller loosening Technical Field

[0001] This invention relates to the field of fans, and more particularly to a fan that prevents the impeller from loosening. Background Technology

[0002] Fans are key equipment in industrial production and environmental control systems, providing gas transport and pressurization. The reliable fixation of the impeller on the main shaft directly affects the stability and safety of the entire machine. Under long-term high-speed rotation and complex load conditions, ensuring the impeller is reliably fixed on the main shaft and preventing relative loosening or displacement is a core technical requirement for ensuring the continuous and efficient operation of the fan and avoiding catastrophic failures.

[0003] Traditional methods of preventing loosening of wind turbine impellers often rely on initial interference fits, key connections, or mechanical tightening with axial lock nuts. These static tightening methods suffer from gradually diminishing preload or stress relaxation under continuous vibration, periodic load changes, and potential thermal expansion differences between the shaft and impeller, leading to decreased reliability. Furthermore, the lack of an automatic locking mechanism linked to wind turbine operating conditions (such as speed) prevents dynamic compensation of the loosening force. In addition, vibrations and thermal loads at the drive end are easily transmitted directly to the impeller shaft system through rigid transmission components, potentially interfering with the stability of the fixed interface. Routine maintenance and inspection often require shutdown and disassembly, a cumbersome process that cannot provide real-time assessment of the locking status. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a fan that prevents the impeller from loosening, in view of the above-mentioned defects in the prior art.

[0005] In order to overcome the above-mentioned defects of the prior art, embodiments of the present invention provide a fan that prevents the impeller from loosening, so as to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a fan for preventing impeller loosening, comprising: a main shaft, an impeller mounted on the main shaft, a housing accommodating the impeller, and a drive device, characterized in that it further comprises an anti-loosening mechanism and a transmission isolation mechanism; the anti-loosening mechanism is disposed at the assembly position of the impeller and the main shaft; the anti-loosening mechanism includes a centrifugal triggering component and an axial locking component; the centrifugal triggering component includes a mounting base and a centrifugal slider, the mounting base is disposed on the impeller, and the centrifugal slider is slidably disposed on the mounting base; the axial locking component includes a bearing seat and a centrifugal pressure block, the bearing seat is disposed on the main shaft and located on one axial side of the impeller, and the centrifugal pressure block is movably disposed on the bearing seat; the centrifugal slider and the centrifugal pressure block are drively connected; the transmission isolation mechanism includes a flexible coupling and a support bearing assembly, the flexible coupling is disposed between the drive device and the main shaft, and the support bearing assembly is disposed between the housing and the main shaft.

[0007] Preferably, the centrifugal trigger assembly further includes a guide and a reset component; the guide is disposed on the mounting base, the centrifugal slider slides in cooperation with the guide, and the extension direction of the guide forms an acute angle with the axial direction of the main shaft; the reset component is disposed between the mounting base and the centrifugal slider, and is used to apply an elastic force to the centrifugal slider toward the initial position.

[0008] Preferably, the axial locking assembly further includes a pre-tightening member and a guide portion; the pre-tightening member is disposed between the bearing seat and the centrifugal pressing block; the guide portion is disposed on the mating surface of the bearing seat and the centrifugal pressing block, and is used to guide the movement direction of the centrifugal pressing block within the bearing seat.

[0009] Preferably, a first mating inclined surface and a second mating inclined surface are provided at the connection between the centrifugal slider and the centrifugal pressing block; the first mating inclined surface is provided on the centrifugal slider; and the second mating inclined surface is provided on the centrifugal pressing block.

[0010] Preferably, the transmission isolation mechanism further includes a heat insulation sleeve; the heat insulation sleeve is fitted onto the main shaft and located between the drive device and the impeller.

[0011] Preferably, it further includes a monitoring mechanism; the monitoring mechanism includes a sensor and a signal processor; the sensor is disposed on the housing, and its sensing direction is towards the impeller; the signal processor is connected to the sensor.

[0012] Preferably, the centrifugal slider and the centrifugal pressing block are connected by a drive pin; the centrifugal pressing block is provided with a guide groove that cooperates with the drive pin.

[0013] Preferably, it further includes an auxiliary locking assembly; the auxiliary locking assembly includes a locking member and an anti-loosening member; the locking member is disposed at the end of the main shaft; the anti-loosening member is disposed between the locking member and the impeller.

[0014] Preferably, the device further includes a testing assembly, which includes a testing rod and an indicator; the testing rod is axially movable and disposed in the housing, with one end located outside the housing and the other end extending into the housing and capable of moving to contact the centrifugal slider during axial movement; the indicator is disposed outside the housing and connected to the testing rod, for indicating the axial displacement of the testing rod.

[0015] Preferably, the housing is provided with a maintenance window and a cover plate; the maintenance window is opened in the housing; the cover plate is detachably provided in the maintenance window.

[0016] Preferably, the heat insulation sleeve is a cylinder made of heat insulation material, which is interference-fitted onto the outer surface of the main shaft section located between the impeller and the flexible coupling.

[0017] The present invention adopts the above technical solution and has the following technical effects compared with the prior art: 1. Realize dynamic adaptive anti-loosening: The anti-loosening mechanism can automatically convert the centrifugal force of the impeller rotation into the axial locking force on the impeller. The higher the speed, the greater the locking force, which effectively prevents loosening caused by vibration and stress relaxation, and has high reliability.

[0018] 2. Effective isolation of external interference: The transmission isolation mechanism can reduce the vibration of the drive end and the transfer of heat from the impeller end to the main shaft, providing a stable operating environment for the core working components.

[0019] 3. Facilitates status monitoring and maintenance: The status can be sensed in real time through the monitoring mechanism, and the anti-loosening function can be manually checked through external testing components. Combined with the maintenance window on the casing, maintenance and inspection are more convenient.

[0020] 4. Structural coordination and safety redundancy: Each component is efficiently linked through inclined planes, guides and other structures, and forms a double guarantee with the auxiliary locking components, resulting in strong overall system safety and reliability.

[0021] 5. The combination of heat insulation sleeve and flexible coupling isolates external vibration and heat interference from the core working components, creating a clean environment for the stable operation of the anti-loosening mechanism; this combination of multiple isolation and dynamic anti-loosening has a synergistic effect, which not only solves the loosening problem itself, but also improves the operational stability and reliability of the entire fan system under complex working conditions. Attached Figure Description

[0022] Figure 1 is a schematic diagram of a fan for preventing impeller loosening according to the present invention; Figure 2 is a schematic diagram of the main shaft and casing of a fan for preventing impeller loosening according to the present invention; Figure 3 is a schematic diagram of the impeller and anti-loosening mechanism of a fan for preventing impeller loosening according to the present invention; Figure 4 is a schematic diagram of the centrifugal slider and centrifugal pressure block of a fan for preventing impeller loosening according to the present invention; Figure 5 is a schematic diagram of the axial locking assembly and transmission pin of a fan for preventing impeller loosening according to the present invention; Figure 6 is a schematic diagram of the centrifugal triggering assembly of a fan for preventing impeller loosening according to the present invention; Figure 7 is a schematic diagram of the main shaft and transmission isolation mechanism of a fan for preventing impeller loosening according to the present invention; Figure 8 is a schematic diagram of the main shaft and impeller of a fan for preventing impeller loosening according to the present invention.

[0023] The reference numerals in the attached drawings are as follows: 1. Main shaft; 2. Impeller; 3. Casing; 301. Maintenance window; 302. Cover plate; 4. Drive device; 5. Anti-loosening mechanism; 501. Centrifugal trigger assembly; 5011. Mounting base; 5012. Centrifugal slider; 5013. Guide component; 5014. Reset component; 5015. First mating inclined surface; 502. Axial locking assembly; 5021. Bearing seat; 5022. Centrifugal pressure block; 5023. Pre-locking mechanism. Fastener; 5024, Guide section; 5025, Second mating inclined surface; 5026, Guide groove; 6, Transmission isolation mechanism; 601, Flexible coupling; 602, Support bearing assembly; 603, Heat insulation sleeve; 7, Monitoring mechanism; 701, Sensor; 702, Signal processor; 8, Transmission pin; 9, Auxiliary locking assembly; 901, Locking component; 902, Anti-loosening component; 10, Test assembly; 1001, Test rod; 1002, Indicator. Detailed Implementation

[0024] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0025] Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Example 1

[0027] As shown in Figures 1 to 8, a fan designed to prevent impeller loosening has a main shaft 1 with a stepped shaft structure. The first shaft section is fitted to the hub hole of the impeller 2 via an interference fit or key connection. The second shaft section is supported in the bearing seat of the casing 3 via a support bearing assembly 602. The third shaft section is connected to the output shaft of the drive device 4 via a flexible coupling 601. When the drive device 4 is started, power is transmitted to the main shaft 1 via the flexible coupling 601, driving the main shaft 1, along with the impeller 2 and related components of the anti-loosening mechanism 5, to rotate. The impeller 2 is an integral structure including a hub and multiple blades. The hub has a mounting hole at its center that matches the first shaft section of the main shaft 1. The blades are circumferentially and radially fixed to the outer circumference of the hub. When the impeller 2 rotates, its hub provides a fixed foundation for the mounting base 5011, the blades push the airflow to generate wind pressure, and the centrifugal force generated by the rotation acts on the centrifugal slider 5012.

[0028] The housing 3 is configured as a volute or cylindrical structure, with an internal cavity accommodating the impeller 2. Air inlets and outlets are located on the side walls or ends. A maintenance window 301 is located on the wall of the housing 3 corresponding to the anti-loosening mechanism 5 or the impeller 2 hub area. A cover plate 302 is attached to the maintenance window 301 by bolts or snap-fit ​​locking, and a sealing ring is sandwiched between the cover plate 302 and the window edge. The drive unit 4 is configured as an electric motor or turbine, its body fixedly mounted on the outside of the housing 3 or on an independent base via a base. The output shaft axis of the drive unit 4 is aligned with the axis of the main shaft 1.

[0029] The anti-loosening mechanism 5 is arranged around the assembly joint between the impeller 2 and the main shaft 1. In the centrifugal trigger assembly 501, the mounting base 5011 is set as an annular sleeve or multiple independent seats, which are fixed to the end face or inner hole step of the impeller 2 hub by screw fastening or welding; the centrifugal slider 5012 is set as a wedge-shaped block or a rectangular block, which is slidably nested in the inclined groove or guide hole opened in the mounting base 5011. The extension direction of the groove or guide hole forms an acute angle with the axial direction of the main shaft 1; that is, it forms an inclined setting, so that the centrifugal slider 5012 generates an axial component force under the action of centrifugal force.

[0030] In the axial locking assembly 502, the support seat 5021 is configured as an annular flange or end face boss, fixed to the shoulder of the main shaft 1 by interference fit or key connection, and adjacent to the end face of the impeller 2 hub. Its left side can serve as one of the axial positioning references of the impeller 2. The centrifugal pressure block 5022 can specifically be composed of a wedge-shaped drive block and a rectangular clamping block. The rectangular clamping block is located to the left of the wedge-shaped drive block and directly faces the end face of the impeller 2 hub. The centrifugal pressure block 5022 can be axially movable and accommodated in the groove or cavity of the support seat 5021 facing the impeller 2.

[0031] It should be noted that the sliding direction of the centrifugal slider 5012 is defined by the guide member 5013 as an inclined direction forming an acute angle with the axial direction of the main shaft 1. When the impeller 2 rotates, the radially outward centrifugal force acts on the centrifugal slider 5012. This centrifugal force can be decomposed along the inclined direction into a component force parallel to the guide member 5013 and a component force perpendicular to the guide member 5013. Among them, the component force parallel to the guide member 5013 drives the centrifugal slider 5012 to slide away from the center of the impeller 2 hub along the guide member 5013, while the component force perpendicular to the guide member 5013 is balanced by the side wall of the mounting base 5011. When the rotational speed decreases and the centrifugal force decreases, the elastic force of the reset member 5014 drives the centrifugal slider 5012 to slide back to its original position along the guide member 5013. This structural design directly utilizes the inclined guide to convert radial centrifugal force into driving force along the guide, eliminating the need for an additional inclined plane conversion structure. In the transmission isolation mechanism 6, the flexible coupling 601 is configured as an elastic sleeve pin coupling or diaphragm coupling, connected to the output shaft of the drive unit 4 and the third shaft section of the main shaft 1 respectively via keys and lock nuts, used to compensate for minor axial misalignment and absorb torsional vibration. The support bearing assembly 602 is configured as a pair of angular contact ball bearings or tapered roller bearings, with the outer ring of the bearing installed in the bearing seat hole of the housing 3, and the inner ring installed in the second shaft section of the main shaft 1. Bearing caps are provided at both ends of the bearing for axial positioning and sealing. The heat insulation sleeve 603 is a cylinder made of ceramic fiber or special alloy, interference-fitted onto the outer surface of the main shaft 1 section located between the impeller 2 and the flexible coupling 601.

[0032] In monitoring unit 7, sensor 701 is configured as an eddy current displacement sensor or an acceleration sensor. Sensor 701 is fixed to the bearing cover of housing 3 or a specially designed bracket via a threaded mounting base. The sensing probe of sensor 701 is axially or radially aligned with the designated monitoring surface of impeller 2 hub. Signal processor 702 is configured as a controller with an analog-to-digital converter and a communication interface. Signal processor 702 is installed in the control cabinet and connected to sensor 701 via a shielded cable.

[0033] The centrifugal slider 5012 and the centrifugal pressing block 5022 are connected by a transmission pin 8. The transmission pin 8 is a cylindrical pin, one end of which is tightly fitted into a pin hole on the side of the centrifugal slider 5012. The guide groove 5026 on the centrifugal pressing block 5022 is an elongated hole or an oblique channel, and the other end of the transmission pin 8 extends into this guide groove 5026. In the auxiliary locking assembly 9, the locking element 901 is a round nut, which engages with the external thread at the end of the main shaft 1. The anti-loosening element 902 is a pair of disc springs or wave spring washers placed opposite each other. The anti-loosening element 902 is sleeved on the main shaft 1 and located between the locking element 901 and the hub end face of the impeller 2. In the test assembly 10, the test rod 1001 is axially movable within the housing 3, with one end located outside the housing 3 and the other end extending inside the housing 3 and capable of moving axially to contact the centrifugal slider 5012. Specifically, the test rod 1001 is a round metal rod that slides through the sealing bushing on the side wall of the housing 3. The test rod 1001 is only inserted when the fan is completely stopped and must be removed before the fan starts running, with the test hole on the housing 3 sealed by a sealing cover. The rod end inside the housing 3 is machined into a ball head or a flat surface, while the rod body outside the housing 3 is machined with external threads. The indicator 1002 is a dial with a pointer, and is fixed to the rod end of the test rod 1001 located outside the housing 3 via a threaded connection.

[0034] When the fan is running, the main shaft 1 drives the impeller 2 and the mounting base 5011 to rotate. The centrifugal slider 5012, under centrifugal force, overcomes the elastic force of the reset member 5014 and slides along the guide member 5013 away from the impeller 2. The radial movement of the centrifugal slider 5012 pushes the second mating inclined surface 5025 on the centrifugal pressing block 5022 through the first mating inclined surface 5015 on it, or through the sliding of the transmission pin 8 in the guide groove 5026, and is converted into an axial thrust on the centrifugal pressing block 5022, forcing the centrifugal pressing block 5022 to overcome the pressure of the preload member 5023 and move along the guide portion 5024 of the bearing seat 5021 towards the end face of the impeller 2 and press the impeller 2. At the same time, the vibration on the drive side is attenuated by the flexible coupling 601, the heat at the end of the impeller 2 is blocked by the heat insulation sleeve 603, and the main shaft 1 is stably supported by the support bearing assembly 602. The sensor 701 monitors the state of the impeller 2 and transmits the signal to the signal processor 702. The auxiliary locking assembly 9 provides static preload. When testing is required, pushing the test rod 1001 from the outside can simulate centrifugal force to trigger the anti-loosening mechanism 5, and the displacement is displayed by the indicator 1002. During maintenance, the removable cover 302 can be used to access the internal mechanism through the maintenance window 301.

[0035] Example 2

[0036] Based on Embodiment 1, as another feasible alternative to the present invention, as shown in Figures 1 to 8, and detailed in the following description: Further, the guide member 5013 is configured as a guide rod or guide groove structure, the mounting base 5011 is correspondingly provided with a fixing hole or fixing groove for mounting the guide member 5013, and the centrifugal slider 5012 is correspondingly provided with a guide hole or guide block that slides with the guide member 5013, ensuring that the sliding trajectory of the centrifugal slider 5012 forms an acute angle with the axial direction of the main shaft 1; the reset member 5014 is configured as a spiral... A spring or disc spring, one end of which abuts against a spring seat on the inner wall of the mounting base 5011, and the other end of which abuts against the end face of the centrifugal slider 5012 facing the inside of the mounting base 5011, when the centrifugal force generated by the rotation of the impeller 2 drives the centrifugal slider 5012 to slide along the guide member 5013 in a direction away from the axis of the main shaft 1, the reset member 5014 is compressed and stores energy; when the speed of the impeller 2 decreases and the centrifugal force weakens, the reset member 5014 releases the stored energy and drives the centrifugal slider 5012 to slide back to the initial position along the guide member 5013.

[0037] Furthermore, the preload element 5023 is configured as a compression spring. One end of the preload element 5023 is installed on the bottom surface of the inner cavity of the support seat 5021, and the other end abuts against the back of the centrifugal pressure block 5022 to provide an initial preload force to the centrifugal pressure block 5022 in the direction of the centrifugal slider 5012. The guide part 5024 is configured as a cooperating guide rail and a slide groove. The guide rail is set on the inner wall of the support seat 5021, and the slide groove is correspondingly opened on the side of the centrifugal pressure block 5022, or the slide groove is set on the inner wall of the support seat 5021. The guide rail is correspondingly protruding on the side of the centrifugal pressing block 5022 to ensure that the moving direction of the centrifugal pressing block 5022 is perpendicular to the axis of the main shaft 1. When the centrifugal slider 5012 moves under the action of centrifugal force and pushes the centrifugal pressing block 5022, the centrifugal pressing block 5022 moves towards the end face of the impeller 2 along the direction defined by the guide part 5024 and squeezes the pre-tightening member 5023 to achieve axial pressing of the impeller 2. When the centrifugal force decreases, the elastic force of the pre-tightening member 5023 pushes the centrifugal pressing block 5022 to move in the opposite direction along the guide part 5024 to reset.

[0038] Furthermore, the first mating inclined surface 5015 is disposed on the side of the centrifugal slider 5012 facing the axis of the main shaft 1 and inclined away from the impeller 2. The second mating inclined surface 5025 is disposed on the end of the centrifugal pressing block 5022 facing the centrifugal slider 5012 and matches the inclination angle of the first mating inclined surface 5015. The two inclined surfaces are in contact with each other. When the impeller 2 rotates, the centrifugal slider 5012 slides outward along the axis of the main shaft 1 under the action of centrifugal force. Through the contact between the first mating inclined surface 5015 and the second mating inclined surface 5025 and the setting of the transmission pin 8 and the guide groove 5026, the sliding is converted into a thrust on the centrifugal pressing block 5022, driving the centrifugal pressing block 5022 to move towards the end face of the impeller 2 in a direction parallel to the axis of the main shaft 1. When the centrifugal force decreases, the centrifugal slider 5012 slides radially inward under the action of the reset member 5014, while the centrifugal pressing block 5022 moves axially under the action of the pre-tightening member 5023.

[0039] Furthermore, the heat insulation sleeve 603 is configured as a cylindrical sleeve made of heat insulation material. The heat insulation sleeve 603 is fixedly sleeved on the outer circumferential surface of the main shaft 1 by interference fit or key connection. One end face of the heat insulation sleeve 603 is close to the hub of the impeller 2 in the axial direction, and the other end face is close to the output end of the drive device 4 in the axial direction, thereby forming a thermal barrier area between the impeller 2 and the drive device 4 in the axial direction of the main shaft 1. When the main shaft 1 is driven to rotate by the drive device 4, the heat insulation sleeve 603 rotates synchronously with the main shaft 1. When the heat generated in the impeller 2 area is conducted through the main shaft 1, it is blocked by the rotating heat insulation sleeve 603 to reduce the heat transfer to the drive device 4.

[0040] Furthermore, sensor 701 is configured as a vibration sensor or displacement sensor. Sensor 701 is fixedly installed on the side wall or end cover of housing 3 via threaded connection or bracket, and its sensing probe is precisely aligned with the hub or blade root area of ​​impeller 2. Signal processor 702 is configured as a microcontroller or application-specific integrated circuit. Signal processor 702 is connected to the electrical interface of sensor 701 via signal cable. When impeller 2 rotates, sensor 701 detects the vibration amplitude or axial displacement of impeller 2 in real time and converts the detected physical quantity into an electrical signal. Signal processor 702 continuously receives and processes the electrical signal. When the processed signal value exceeds a preset threshold, signal processor 702 triggers an alarm circuit or sends a shutdown command to the fan control system.

[0041] Furthermore, the transmission pin 8 is rotatably hinged to a groove inside the centrifugal slider 5012, with its pin body inclined toward the centrifugal pressing block 5022, and its end extending out of the centrifugal slider 5012 and inserted into the guide groove 5026 of the centrifugal pressing block 5022. The guide groove 5026 is located at the corresponding position of the centrifugal pressing block 5022 and is an inclined arc-shaped groove with sufficient depth and length, with its right side wall and bottom wall forming a continuous arc-shaped guide surface. In the initial state, under the action of the reset member 5014, the end of the transmission pin 8 is located at the upper right part of the guide groove 5026. When the centrifugal slider 5012 slides along an inclined direction forming an acute angle with the axial direction of the main shaft 1 under the action of centrifugal force, the hinged transmission pin 8 moves to the right accordingly. Its end first contacts and presses against the right arc-shaped wall of the guide groove 5026. As the sliding continues, the transmission pin 8 slides to the lower left along the arc-shaped wall until its trajectory is guided to contact the left side wall of the guide groove 5026. During this process, the pressing action of the transmission pin 8 against the groove wall generates a component force that forces the centrifugal block 5022 to move to the left as a whole, thereby driving the centrifugal block 5022 to slide to the left along its guide portion 5024. When the centrifugal force decreases, each component is reset under the action of the reset member 5014 and the pre-tightening member 5023.

[0042] Furthermore, the locking element 901 is configured as a locking nut, which is screwed onto the external thread section at the end of the main shaft 1 via a threaded connection; the anti-loosening element 902 is configured as an elastic washer or a disc spring, which is sleeved on the main shaft 1 and located between the locking element 901 and the hub end face of the impeller 2; when the locking element 901 is tightened, the locking element 901 moves axially along the thread of the main shaft 1 and presses against the anti-loosening element 902, causing the anti-loosening element 902 to undergo elastic deformation, thereby applying a continuous axial preload to the hub of the impeller 2; this preload, together with the clamping force generated by the anti-loosening mechanism 5, works to prevent the impeller 2 from axially loosening on the main shaft 1; when disassembly is required, the locking element 901 is loosened in the opposite direction, the locking element 901 retracts axially, releasing the compression on the anti-loosening element 902, and the elastic deformation of the anti-loosening element 902 is restored.

[0043] Furthermore, the test rod 1001 is configured as a cylindrical rod body, passing through a through hole opened on the housing 3, and is axially movable to the housing 3 through a threaded connection or bushing installation; the end face of the test rod 1001 located inside the housing 3 is configured as a flat surface or a ball head, and this end face is directly opposite the outer end face or side boss of the centrifugal slider 5012; the indicator 1002 is a scale provided on the test rod 1001, and a pointer is provided at a corresponding position on the housing 3 to indicate the distance the test rod 1001 has entered the housing 3. The indicator 1002 is fixedly installed on one end of the test rod 1001 located outside the housing 3. When it is necessary to test the function of the anti-loosening mechanism 5, the test is only carried out when the fan is stopped. The test rod 1001 is pushed or pulled axially from the outside. The end of the test rod 1001 presses against or pulls the centrifugal slider 5012, simulating centrifugal force to produce sliding displacement, thereby visually displaying the movable stroke and reset state of the centrifugal slider 5012. After the test is completed, the external force is removed, the test rod 1001 is taken out, the opening at the housing 3 is sealed, and the centrifugal slider 5012 is reset under the action of the reset component 5014.

[0044] Furthermore, the maintenance window 301 is configured as a circular or rectangular through-hole, and the maintenance window 301 is opened on the side wall or end of the housing 3, with its opening position corresponding to the installation area of ​​the internal anti-loosening mechanism 5 or impeller 2; the cover plate 302 is configured as a plate body that matches the shape of the maintenance window 301, and the cover plate 302 is detachably connected to the housing 3 at the edge of the maintenance window 301 by multiple bolts or buckle structures; a sealing gasket is provided at the mating surface of the cover plate 302 and the maintenance window 301, and when the cover plate 302 is installed in place and fastened by the connector, the cover plate 302 presses the sealing gasket to achieve the closure and sealing of the maintenance window 301; when maintenance or inspection is required, the connector of the cover plate 302 is removed, and the cover plate 302 can be removed from the maintenance window 301 to expose the internal space of the housing 3.

[0045] Finally, several points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly, and can refer to mechanical or electrical connections, or internal connections between two components, or direct connections. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may change. Second, the accompanying drawings of the embodiments disclosed in this invention only involve structures relevant to the embodiments disclosed in this invention; other structures can refer to common designs. Where there is no conflict, the same embodiment and different embodiments of this invention can be combined with each other. Finally, the above descriptions are merely preferred embodiments of this invention and are not intended to limit this invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A fan for preventing impeller loosening, comprising: The assembly comprises a main shaft (1), an impeller (2) mounted on the main shaft (1), a housing (3) housing the impeller (2), and a drive device (4), characterized in that it further comprises an anti-loosening mechanism (5) and a transmission isolation mechanism (6); the anti-loosening mechanism (5) is located at the assembly position of the impeller (2) and the main shaft (1); the anti-loosening mechanism (5) comprises a centrifugal trigger assembly (501) and an axial locking assembly (502); the centrifugal trigger assembly (501) comprises a mounting base (5011) and a centrifugal slider (5012), the mounting base (5011) is disposed on the impeller (2), and the centrifugal slider (5012) is slidably disposed on the mounting base (5011); The axial locking assembly (502) includes a bearing seat (5021) and a centrifugal pressure block (5022). The bearing seat (5021) is disposed on the main shaft (1) and located on one axial side of the impeller (2). The centrifugal pressure block (5022) is movably disposed on the bearing seat (5021). The centrifugal slider (5012) is connected to the centrifugal pressure block (5022) in a transmission connection. The transmission isolation mechanism (6) includes a flexible coupling (601) and a support bearing assembly (602). The flexible coupling (601) is disposed between the drive device (4) and the main shaft (1). The support bearing assembly (602) is disposed between the housing (3) and the main shaft (1).

2. The fan for preventing impeller loosening according to claim 1, characterized in that: The centrifugal trigger assembly (501) further includes a guide (5013) and a reset member (5014); the guide (5013) is disposed on the mounting base (5011), the centrifugal slider (5012) is slidably engaged with the guide (5013), and the extension direction of the guide (5013) forms an acute angle with the axial direction of the main shaft (1); the reset member (5014) is disposed between the mounting base (5011) and the centrifugal slider (5012), and is used to apply an elastic force toward the initial position to the centrifugal slider (5012).

3. The fan for preventing impeller loosening according to claim 1, characterized in that: The axial locking assembly (502) further includes a pre-tightening member (5023) and a guide portion (5024); the pre-tightening member (5023) is disposed between the bearing seat (5021) and the centrifugal pressing block (5022); the guide portion (5024) is disposed on the mating surface of the bearing seat (5021) and the centrifugal pressing block (5022) and is used to guide the movement direction of the centrifugal pressing block (5022) within the bearing seat (5021).

4. A fan for preventing impeller loosening according to claim 2, characterized in that: The centrifugal slider (5012) and the centrifugal pressing block (5022) are connected by a first mating inclined surface (5015) and a second mating inclined surface (5025); the first mating inclined surface (5015) is provided on the centrifugal slider (5012); the second mating inclined surface (5025) is provided on the centrifugal pressing block (5022).

5. A fan for preventing impeller loosening according to claim 1, characterized in that: The transmission isolation mechanism (6) further includes a heat insulation sleeve (603); the heat insulation sleeve (603) is sleeved on the main shaft (1) and located between the drive device (4) and the impeller (2).

6. A fan for preventing impeller loosening according to claim 1, characterized in that: It also includes a monitoring mechanism (7); the monitoring mechanism (7) includes a sensor (701) and a signal processor (702); the sensor (701) is disposed on the housing (3) and its sensing direction is toward the impeller (2); the signal processor (702) is connected to the sensor (701).

7. A fan for preventing impeller loosening according to claim 4, characterized in that: The centrifugal slider (5012) and the centrifugal pressing block (5022) are connected by a transmission pin (8); the centrifugal pressing block (5022) is provided with a guide groove (5026) that cooperates with the transmission pin (8).

8. A fan for preventing impeller loosening according to claim 1, characterized in that: It also includes an auxiliary locking assembly (9); the auxiliary locking assembly (9) includes a locking member (901) and an anti-loosening member (902); the locking member (901) is disposed at the end of the main shaft (1); the anti-loosening member (902) is disposed between the locking member (901) and the impeller (2).

9. A fan for preventing impeller loosening according to claim 1, characterized in that: It also includes a test assembly (10), which includes a test rod (1001) and an indicator (1002); the test rod (1001) is axially movable and disposed on the housing (3), with one end located outside the housing (3) and the other end extending into the housing (3) and able to move to contact the centrifugal slider (5012) during axial movement; the indicator (1002) is disposed outside the housing (3) and connected to the test rod (1001) for indicating the axial displacement of the test rod (1001).

10. A fan for preventing impeller loosening according to claim 5, characterized in that: The housing (3) is provided with a maintenance window (301) and a cover plate (302); the maintenance window (301) is opened on the housing (3); the cover plate (302) is detachably provided on the maintenance window (301); the heat insulation sleeve (603) is a cylinder made of heat insulation material, which is interference fitted on the outer surface of the main shaft (1) section located between the impeller (2) and the flexible coupling (601).

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