Anti-reverse rotation heat dissipation fan and server

Abstract

The present invention discloses an anti-reverse cooling fan and server, and relates to the technical field of cooling fans. The anti-reverse cooling fan includes a motor stator, a motor rotor, fan blades, and a one-way limiting device. The fan blades are arranged on the outer peripheral side of the motor rotor; the one-way limiting device is arranged between the motor rotor and the motor stator; when the one-way limiting device is in a first position, the motor rotor can rotate in a forward direction or a reverse direction relative to the motor stator; when the one-way limiting device is in a second position, the motor rotor can rotate in a forward direction relative to the motor stator and be locked in a reverse direction. In the present invention, by providing a one-way limiting device, the motor rotor can be rotated in a forward direction relative to the motor stator and locked in a reverse direction, thereby preventing the motor rotor from reversing relative to the motor stator, effectively protecting the anti-reverse cooling fan, and enabling the anti-reverse cooling fan to start normally even when the direction of the surrounding airflow is opposite to the direction of the forward rotating airflow.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat dissipation fans, in particular to a reverse-preventing heat dissipation fan. In addition, the present application also relates to a server comprising the reverse-preventing heat dissipation fan. BACKGROUND

[0002] The heat dissipation fan is generally arranged at the rear window of the server. With the increase of the power density of the server, the heat generated in the server increases, and the required system fan rotating speed also increases. During the process of fan hot plug maintenance, when the fan is inserted into the system, the inserted fan will be reversed due to the negative air pressure in the system because the rotating speed of other fans in the system is very high. The fan may not start normally due to the excessively high reverse rotating speed, and even the fan may be damaged. If the fan is always in a fault state, the server system air flow cannot take out the heat, which will cause the temperature of the internal components of the server to rise, affect the performance and service life of the components, and even cause the server to be shut down due to over-temperature protection.

[0003] In summary, how to avoid the reverse of the heat dissipation fan when the heat dissipation fan is inserted into the system is a technical problem to be solved by the technical personnel in the field. SUMMARY

[0004] The purpose of the present application is to provide a reverse-preventing heat dissipation fan, which can limit the motor rotor to rotate only in the forward direction relative to the motor stator through a one-way limiting device, so as to avoid the reverse of the heat dissipation fan when the heat dissipation fan is inserted into the system.

[0005] In addition, another purpose of the present application is to provide a server comprising the reverse-preventing heat dissipation fan.

[0006] In order to solve the above technical problems, the present application provides a reverse-preventing heat dissipation fan, comprising:

[0007] a motor stator;

[0008] a motor rotor, which is sleeved on the outer periphery of the motor stator in the axial direction of the motor;

[0009] a fan blade, which is arranged on the outer peripheral side of the motor rotor;

[0010] a one-way limiting device, which is arranged between the motor rotor and the motor stator, and can be switched to a first position or a second position;

[0011] When the one-way limiting device is located at the first position, the motor rotor can rotate in the forward direction or the reverse direction relative to the motor stator; when the one-way limiting device is located at the second position, the motor rotor can rotate in the forward direction relative to the motor stator and is locked in the reverse direction.

[0012] In one aspect, the one-way limiting device comprises:

[0013] a first clamping groove, arranged in one of the motor rotor and the motor stator;

[0014] a first stop structure, movably arranged in the other one of the motor rotor and the motor stator between the first position and the second position;

[0015] a first elastic support structure, one end of which is connected to the first stop structure and the other end of which is connected to a first adjusting device;

[0016] the first adjusting device, arranged in the other one of the motor rotor and the motor stator, is used to adjust the extension state of the first elastic support structure, so that the first stop structure switches to the first position or the second position.

[0017] In another aspect, the first adjusting device comprises a limiting ring and a limiting block arranged on the limiting ring, the limiting ring is rotatably arranged on the other one of the motor rotor and the motor stator between a first angular position and a second angular position; the first stop structure is rotatably arranged on the limiting ring;

[0018] when the limiting ring rotates to the first angular position, the first elastic support structure is in a stretched state, and the first stop structure is in the first position;

[0019] when the limiting ring rotates to the second angular position, the first elastic support structure is in a compressed state, the first stop structure is in the second position, and the first stop structure is in contact with the limiting block to limit the rotation of the first stop structure to the side close to the limiting block.

[0020] In another aspect, the limiting ring is sleeved on the outer periphery of the motor stator; the first adjusting device further comprises an angular position adjusting assembly for controlling the rotation of the limiting ring, the angular position adjusting assembly comprises:

[0021] a first elastic member, one end of which is connected to the limiting ring and the other end of which is connected to the motor stator;

[0022] a first electromagnet, one of the limiting ring and the motor stator is provided with the first electromagnet, and the other one of the limiting ring and the motor stator is provided with a first magnetic attraction member for being attracted to the first electromagnet;

[0023] When the first electromagnet is powered on, the first electromagnet is attracted to the first magnetic attraction element, and the limiting ring rotates to the first angle position; when the first electromagnet is powered off, the first electromagnet is released from the attraction to the first magnetic attraction element, and the limiting ring rotates to the second angle position under the elastic force of the first elastic element.

[0024] In another aspect, further comprising:

[0025] A first information acquisition device is configured to acquire rotation speed information of the motor rotor and first direction information;

[0026] A second information acquisition device is configured to acquire position information of the limiting ring;

[0027] A controller is configured to adjust the position of the limiting ring according to the rotation speed information, the first direction information, and the position information.

[0028] In another aspect, the first adjusting device includes a telescopic limiting structure, one end of the telescopic limiting structure is connected to the first stop structure, and the other end is connected to the other one of the motor rotor or the motor stator; the first stop structure is rotatably arranged on the other one of the motor rotor or the motor stator;

[0029] When the telescopic limiting structure is in the extended state, the first stop structure rotates to the second position;

[0030] When the telescopic limiting structure is in the retracted state, the first stop structure rotates to the first position.

[0031] In another aspect, the other end of the telescopic limiting structure is connected to the motor stator; the first adjusting device further includes a second electromagnet for controlling the extension of the telescopic limiting structure, the second electromagnet is arranged on one of the telescopic limiting structure and the motor stator, and the other one of the telescopic limiting structure and the motor stator is provided with a second magnetic attraction element for being attracted to the second electromagnet;

[0032] When the second electromagnet is powered on, the second electromagnet is attracted to the second magnetic attraction element, and the telescopic limiting structure is in the retracted state; when the second electromagnet is powered off, the second electromagnet is released from the attraction to the second magnetic attraction element, and the telescopic limiting structure is in the extended state under the elastic force of the first elastic support structure.

[0033] In another aspect, the first clamping groove comprises an arc-shaped guiding surface and a first limiting plane, the first limiting plane extends along the radial direction of the motor rotor or the motor stator, one end of the arc-shaped guiding surface is connected with the first limiting plane, and the other end of the arc-shaped guiding surface extends to the inner side surface of the motor rotor or the outer side surface of the motor stator.

[0034] The first stop structure is provided with an arc-shaped sliding surface for cooperating with the arc-shaped guiding surface and a second limiting plane for cooperating with the first limiting plane.

[0035] In another aspect, the one-way limiting device is movably arranged along the axial direction of the motor stator; the one-way limiting device comprises a first gear ring and a second gear ring, and the first gear ring and the second gear ring are both sleeved on the outer periphery of the motor stator.

[0036] The outer side surface of the first gear ring is provided with a second stop structure and a second elastic support structure, and the inner side surface of the motor rotor is provided with a second clamping groove for cooperating with the second stop structure; the second stop structure is rotatably arranged on the first gear ring; one end of the second elastic support structure is connected to the second stop structure, and the other end of the second elastic support structure is connected to the first gear ring; when the one-way limiting device is located at the first position, the second gear ring corresponds to the second clamping groove; when the one-way limiting device is located at the second position, the second stop structure cooperates with the second clamping groove.

[0037] The first gear ring and the second gear ring are fixedly connected; the anti-reverse heat dissipation fan further comprises a second adjusting device for driving the one-way limiting device to switch between the first position and the second position, the second adjusting device comprises a third electromagnet, a third magnetic attraction member for being attracted to the third electromagnet, and a third elastic member, one of the third electromagnet and the third magnetic attraction member is arranged on the one-way limiting device, and the other of the third electromagnet and the third magnetic attraction member is arranged on the motor stator; one end of the third elastic member is connected to the one-way limiting device, and the other end of the third elastic member is connected to the motor stator.

[0038] The anti-reverse heat dissipation fan further comprises a turning detection member and an alarm device, the turning detection member is used for acquiring second turning information of the fan blade, and when the turning detection member detects that the fan blade reversely rotates, the alarm device sends warning information.

[0039] A server, characterized by comprising a server main body, a heat dissipation module, and a power module, the heat dissipation module and the power module both comprise the anti-reverse heat dissipation fan of any one of the above.

[0040] From the above technical scheme can be seen, the anti-reverse heat dissipation fan provided by the application comprises a motor stator, a motor rotor, fan blades and a one-way limiting device. The motor rotor is rotatably sleeved on the outer periphery of the motor stator around the axial direction of the motor; the fan blades are arranged on the outer peripheral side of the motor rotor; the one-way limiting device is arranged between the motor rotor and the motor stator, and the one-way limiting device can be switched to a first position or a second position; when the one-way limiting device is located at the first position, the motor rotor can rotate in the forward direction or the reverse direction relative to the motor stator; when the one-way limiting device is located at the second position, the motor rotor can rotate in the forward direction relative to the motor stator and is locked in the reverse direction.

[0041] In actual use, when the anti-reverse heat dissipation fan is normally used, the one-way limiting device can be controlled to be located at the first position, and the motor rotor can rotate in the forward direction or the reverse direction relative to the motor stator, and the specific rotating direction can be determined according to actual conditions; when the anti-reverse heat dissipation fan is inserted into a server system, first, the one-way limiting device is adjusted to the second position, the motor rotor can rotate in the forward direction relative to the motor stator and is locked in the reverse direction, so that the reverse rotation of the fan blades can be avoided, then the motor rotor is controlled to drive the fan blades to rotate in the forward direction until the rotating speed of the fan blades is greater than a preset rotating speed, when this time, the one-way limiting device is adjusted to the first position, and the motor rotor is controlled to drive the fan blades to continue to rotate in the forward direction. The preset rotating speed mentioned here refers to the minimum rotating speed of the anti-reverse heat dissipation fan that is not affected by the surrounding airflow, when the rotating speed of the anti-reverse heat dissipation fan is less than the preset rotating speed, if the one-way limiting device is at the first position at this time, the anti-reverse heat dissipation fan will be affected by the surrounding airflow and will be reversed or the rotating speed will be reduced; when the rotating speed of the anti-reverse heat dissipation fan is greater than the preset rotating speed, if the one-way limiting device is at the first position at this time, the anti-reverse heat dissipation fan can maintain normal forward rotation and will not be affected by the surrounding airflow to be reversed or the rotating speed to be reduced.

[0042] The application has the following beneficial effects:

[0043] 1. In the application, the one-way limiting device is arranged, so that the motor rotor can rotate in the forward direction relative to the motor stator and is locked in the reverse direction, the reverse rotation of the motor rotor relative to the motor stator is avoided, and the reverse rotation of the fan blades is avoided, so that the anti-reverse heat dissipation fan can be effectively protected, and the anti-reverse heat dissipation fan can be normally started even in the case that the direction of the surrounding airflow is opposite to the direction of the forward rotating airflow.

[0044] 2. In the application, the position of the one-way limiting device can be switched, so that the normal rotation or one-way rotation of the motor rotor relative to the motor stator can be adjusted, different requirements can be met, and the use range of the anti-reverse heat dissipation fan can be expanded.

[0045] In addition, the application also relates to a server comprising the anti-reverse heat dissipation fan. BRIEF DESCRIPTION OF DRAWINGS

[0046] In order to more clearly illustrate the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings described in the following embodiments are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort based on these drawings.

[0047] Figure 1 The structure schematic view of the one-way limiting device in the anti-reverse heat dissipation fan provided by the embodiments of the present application in the second position.

[0048] Figure 2 The structure schematic view of the one-way limiting device in the anti-reverse heat dissipation fan provided by the embodiments of the present application in the first position.

[0049] Figure 3 The side view schematic view of the anti-reverse heat dissipation fan provided by the embodiments of the present application.

[0050] Figure 4 The structure schematic view of the motor rotor and the fan blade.

[0051] Figure 5 The installation position schematic view of the first stop structure.

[0052] Figure 6 The structure schematic view of the one-way limiting device.

[0053] Figure 7 The control logic schematic view of the anti-reverse heat dissipation fan.

[0054] Figures 1 to 7 In the drawings, the reference signs are as follows:

[0055] 1-motor stator;

[0056] 11-rotating shaft;

[0057] 2-motor rotor;

[0058] 3-fan blade;

[0059] 4-one-way limiting device;

[0060] 41-first clamping groove; 42-first stop structure; 43-first elastic support structure; 44-first adjusting device; 441-limiting ring; 442-limiting block;

[0061] 5-fan frame;

[0062] 6-controller;

[0063] 61-first control unit; 62-second control unit;

[0064] 7 - the first information acquisition device;

[0065] 8 - the second information acquisition device. DETAILED DESCRIPTION

[0066] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0067] The core of the present application is to provide an anti-reverse heat dissipation fan, which can limit the motor rotor to rotate only in the forward direction relative to the motor stator through the one-way limiting device, thereby avoiding the reverse rotation of the heat dissipation fan when it is inserted into the system.

[0068] In addition, another core of the present application is to provide a server comprising the anti-reverse heat dissipation fan.

[0069] The anti-reverse heat dissipation fan provided in the embodiments comprises a motor stator 1, a motor rotor 2, fan blades 3, and a one-way limiting device 4. The motor rotor 2 is rotatably sleeved on the outer periphery of the motor stator 1 along the axial direction of the motor; the fan blades 3 are arranged on the outer peripheral side of the motor rotor 2; the one-way limiting device 4 is arranged between the motor rotor 2 and the motor stator 1, and the one-way limiting device 4 can be switched to a first position or a second position; when the one-way limiting device 4 is located at the first position, the motor rotor 2 can rotate in the forward direction or the reverse direction relative to the motor stator 1; when the one-way limiting device 4 is located at the second position, the motor rotor 2 can rotate in the forward direction relative to the motor stator 1 and is locked in the reverse direction.

[0070] It should be noted that the anti-reverse heat dissipation fan can further comprise a fan frame 5, the fan frame 5 is covered on the outside of the fan blades 3, and the fan frame 5 is provided with an air inlet hole and an air outlet hole; in actual use, the fan frame 5 can protect the internal fan blades 3, and at the same time, avoid damaging the surrounding parts during the rotation of the fan blades 3, thereby improving the safety.

[0071] In actual use, when the anti-reverse heat dissipation fan is used normally, the one-way limiting device 4 can be controlled to be located at the first position, and the motor rotor 2 can rotate in the forward direction or the reverse direction relative to the motor stator 1, and the specific rotation direction can be determined according to the actual situation.

[0072] When the anti-reverse heat dissipation fan is pulled out, the one-way limiting device 4 is adjusted to the second position, and due to the effect of inertia, the fan blades 3 continue to rotate in the forward direction until they stop rotating; after the fan blades 3 stop rotating, due to the one-way limiting device 4 being in the second position, the fan blades 3 cannot rotate in the reverse direction.

[0073] When the anti-reverse heat dissipation fan is inserted into the server system, first, the one-way limiting device 4 is adjusted to the second position, the motor rotor 2 is rotatable in the forward direction and locked in the reverse direction relative to the motor stator 1, which can prevent the fan blades 3 from reversing, then the motor rotor 2 is controlled to drive the fan blades 3 to rotate in the forward direction until the rotation speed of the fan blades 3 is greater than the preset rotation speed, at this time the one-way limiting device 4 is adjusted to the first position, and the motor rotor 2 is controlled to drive the fan blades 3 to continue to rotate in the forward direction. The preset rotation speed mentioned in this application refers to the minimum rotation speed of the anti-reverse heat dissipation fan that is not affected by the surrounding airflow. When the rotation speed of the anti-reverse heat dissipation fan is less than the preset rotation speed, if the one-way limiting device 4 is in the first position at this time, the anti-reverse heat dissipation fan will reverse or the rotation speed will decrease due to the influence of the surrounding airflow; when the rotation speed of the anti-reverse heat dissipation fan is greater than the preset rotation speed, if the one-way limiting device 4 is in the first position at this time, the anti-reverse heat dissipation fan can maintain normal forward rotation and will not reverse or decrease in rotation speed due to the influence of the surrounding airflow.

[0074] When the anti-reverse heat dissipation fan needs to be paused for a period of time, first, the motor rotor 2 is controlled to stop rotating; the fan blades 3 will continue to rotate forward due to inertia, and when the forward rotation speed of the fan blades 3 is less than the preset rotation speed, the one-way limiting device 4 is controlled to switch to the second position until the fan blades 3 stop rotating. When the anti-reverse heat dissipation fan needs to be started again, the fan blades 3 are controlled to rotate forward until the forward rotation speed of the fan blades 3 is greater than the preset rotation speed, the one-way limiting device 4 is controlled to switch to the first position, and the fan blades 3 are controlled to continue to rotate forward.

[0075] In this embodiment, by setting the one-way limiting device 4, the motor rotor 2 can be rotatable in the forward direction and locked in the reverse direction relative to the motor stator 1, which can prevent the motor rotor 2 from reversing relative to the motor stator 1, and further prevent the fan blades 3 from reversing, which can effectively protect the anti-reverse heat dissipation fan and enable the anti-reverse heat dissipation fan to start normally even when the direction of the surrounding airflow is opposite to the direction of the forward rotating airflow; in this embodiment, the one-way limiting device 4 can be switched to adjust the normal rotation or one-way rotation of the motor rotor 2 relative to the motor stator 1, which can adapt to different needs and expand the use range of the anti-reverse heat dissipation fan.

[0076] On the basis of the above-mentioned embodiments, the one-way limiting device 4 can include a first clamping groove 41, a first stop structure 42, a first elastic supporting structure 43, and a first adjusting device 44. The first clamping groove 41 is arranged in one of the motor rotor 2 or the motor stator 1. The first stop structure 42 is movably arranged in the other of the motor rotor 2 or the motor stator 1 between a first position and a second position. One end of the first elastic supporting structure 43 is connected to the first stop structure 42, and the other end is connected to the first adjusting device 44. The first adjusting device 44 is arranged in the other of the motor rotor 2 or the motor stator 1. The first adjusting device 44 is used to adjust the extension state of the first elastic supporting structure 43, so that the first stop structure 42 is switched to the first position or the second position.

[0077] In actual use, when it is necessary to adjust the first stop structure 42 to the second position, the first elastic supporting structure 43 is in a compressed state through the first adjusting device 44. The first elastic supporting structure 43 pushes the first stop structure 42 to move in a direction close to the first clamping groove 41. Under the elastic force of the first elastic supporting structure 43, the first stop structure 42 cooperates with the first clamping groove 41 to limit the rotation of the motor rotor 2 relative to the motor stator 1, so that the motor rotor 2 can only rotate in the forward direction relative to the motor stator 1. When it is necessary to adjust the first stop structure 42 to the first position, the first elastic supporting structure 43 is in a stretched state through the first adjusting device 44. The first elastic supporting structure 43 pulls the first stop structure 42 to move in a direction away from the first clamping groove 41. Under the elastic force of the first elastic supporting structure 43, the first stop structure 42 is disengaged from the first clamping groove 41, and the motor rotor 2 can rotate in the forward direction or the reverse direction relative to the motor stator 1.

[0078] It should be noted that the first adjusting device 44 in the specific embodiment can adjust the extension state of the first elastic supporting structure 43 by rotating to different positions, or can adjust the extension state of the first elastic supporting structure 43 by stretching to different positions, or can adjust the extension state of the first elastic supporting structure 43 by other means. The specific method is determined according to the actual situation.

[0079] In the specific embodiment, the different positions of the first stop structure 42 are adjusted to realize the clamping cooperation or disengagement of the first stop structure 42 and the first clamping groove 41, so as to realize the one-way rotation or disengage the one-way rotation limitation of the motor rotor 2 relative to the motor stator 1. The cooperation of the first stop structure 42 and the first clamping groove 41 realizes the one-way rotation through the mechanical structure, which can effectively improve the reliability of the one-way rotation of the motor rotor 2 relative to the motor stator 1. In addition, the arrangement of the first elastic supporting structure 43 can realize the reset of the first stop structure 42, and the control process is simple and convenient.

[0080] In a specific embodiment, combining Figure 1 、 Figure 2 、 Figure 6 As shown, the first adjustment device 44 can include a limit ring 441 and a limit block 442 arranged on the limit ring 441, and the limit ring 441 can be rotatably arranged on the other of the motor rotor 2 or the motor stator 1 between the first angular position and the second angular position; the first stop structure 42 is rotatably set on the limit ring 441; when the limit ring 441 is rotated to the first angular position, the first elastic support structure 43 is in a stretched state, and the first stop structure 42 is in the first position; when the limit ring 441 is rotated to the second angular position, the first elastic support structure 43 is in a compressed state, the first stop structure 42 is in the second position, and the first stop structure 42 is in contact with the limit block 442 to limit the first stop structure 42 from rotating toward the side close to the limit block 442.

[0081] like Figure 5 As shown, the first stopping structure 42 is rotatably disposed on the motor stator 1 via the rotating shaft 11 .

[0082] In actual use, when the control limit ring 441 is rotated to the first position, as shown in FIG. Figure 2 As shown, the first elastic support structure 43 is in a stretched state. Under the pull of the first elastic support structure 43, the first stop structure 42 deflects to a position close to the motor stator 1, and the first stop structure 42 is released from the first slot 41; at this time, the motor rotor 2 can rotate both forward and reverse relative to the motor stator 1; the forward direction is as shown in FIG. Figure 1 、 Figure 2 The direction indicated by the arrow; the reverse direction is as follows Figure 1 、 Figure 2 When the control limit ring 441 rotates to the second position, as shown in FIG. Figure 1 As shown, the first elastic support structure 43 is in a compressed state or a natural state. Under the push of the elastic force of the first elastic support structure 43, the first stop structure 42 deflects to a position close to the motor rotor 2, and the first stop structure 42 is engaged with the first slot 41, and at this time the first stop structure 42 is in contact with the limit block 442, which can avoid excessive deflection of the first stop structure 42; at this time, the motor rotor 2 can only rotate forward relative to the motor stator 1. When the motor rotor 2 rotates reversely relative to the motor stator 1 at this time, the first stop structure 42 is engaged with the first slot 41, and the limit block 442 limits the first stop structure 42 from continuing to deflect, which can effectively limit the reverse rotation of the motor rotor 2 relative to the motor stator 1.

[0083] The position of the first stop structure 42 can be adjusted through the setting of the limiting ring 441 and the limiting block 442, and the adjustment process is convenient and easy to operate. In addition, the limiting block 442 can effectively limit the deflection angle of the first stop structure 42, and when the first stop structure 42 is located at the second position, the reverse rotation of the motor rotor 2 relative to the motor stator 1 can be effectively limited, thereby improving the reliability of the one-way rotation of the motor rotor 2 relative to the motor stator 1.

[0084] On the basis of the above embodiment, the limiting ring 441 is sleeved on the outer periphery of the motor stator 1; the first adjusting device 44 further includes an angle position adjusting assembly for controlling the rotation of the limiting ring 441, and the angle position adjusting assembly includes a first elastic member, a first electromagnet and a first magnetic attraction member. One end of the first elastic member is connected to the limiting ring 441, and the other end is connected to the motor stator 1; one of the limiting ring 441 and the motor stator 1 is provided with the first electromagnet; the other of the limiting ring 441 and the motor stator 1 is provided with the first magnetic attraction member for being attracted to the first electromagnet; when the first electromagnet is powered on, the first electromagnet is attracted to the first magnetic attraction member, and the limiting ring 441 rotates to the first angle position; when the first electromagnet is powered off, the first electromagnet is unattracted to the first magnetic attraction member, and the limiting ring 441 rotates to the second angle position under the elastic force of the first elastic member.

[0085] It should be noted that the first magnetic attraction member in the embodiment can also be an electromagnet. By controlling the flow direction of the current flowing through the electromagnets in the first electromagnet and the first magnetic attraction member, an attractive force or a repulsive force can be generated between them, so that the limiting ring 441 rotates to the first angle position or the second angle position.

[0086] In the embodiment, by setting the first electromagnet and the first magnetic attraction member, the on-off of the first electromagnet can be controlled to control the attraction or unattraction between the first electromagnet and the first magnetic attraction member in actual use. The control process is convenient and conducive to automatic control.

[0087] In a specific embodiment, the anti-reverse rotation heat dissipation fan further includes a first information acquisition device 7, a second information acquisition device 8 and a controller 6. The first information acquisition device 7 is used to acquire the rotation speed information and the first rotation direction information of the motor rotor 2; the second information acquisition device 8 is used to acquire the position information of the limiting ring 441; and the controller 6 is used to adjust the position of the limiting ring 441 according to the rotation speed information, the first rotation direction information and the position information.

[0088] As shown in Figure 7 The controller 6 further includes a first control unit 61 and a second control unit 62. The first control unit 61 is used to control the rotation of the motor rotor 2; and the second control unit 62 is used to control the rotation of the limiting ring 441.

[0089] In actual use, the first information acquisition device 7 can acquire the rotating speed information of the motor rotor 2 and the first rotating direction information, and send the rotating speed information and the first rotating direction information to the controller 6; the second information acquisition device 8 can acquire the position information of the limiting ring 441; and the controller 6 can control the motor rotor 2 to rotate according to the rotating speed information, the first rotating direction information and the position information of the limiting ring 441.

[0090] Specifically, the use process is as follows:

[0091] Firstly, the first information acquisition device 7 acquires the rotating speed information of the motor rotor 2 and the first rotating direction information; and the second information acquisition device 8 acquires the position information of the limiting ring 441.

[0092] Secondly, the controller 6 judges whether the limiting ring 441 is at the second angle position according to the position information, and controls the anti-reverse cooling fan to be plugged in if yes.

[0093] Thirdly, the first control unit 61 controls the motor rotor 2 to drive the fan blade 3 to rotate in the positive direction.

[0094] Fourthly, the first information acquisition device acquires the rotating speed information of the motor rotor 2 again.

[0095] Fifthly, the controller 6 judges whether the rotating speed of the fan blade 3 is greater than the preset rotating speed according to the rotating speed information, and proceeds to the next step if yes, or returns to the third step if no.

[0096] Sixthly, the second control unit 62 controls the limiting ring 441 to rotate to the first angle position.

[0097] The anti-reverse cooling fan in the embodiment can realize the automatic control of the rotating process of the anti-reverse cooling fan, and is convenient for acquiring the rotating speed and rotating direction information of the anti-reverse cooling fan in time, which is beneficial to taking measures in time. Moreover, the rotating position of the limiting ring 441 can be controlled, so that the use process of the anti-reverse cooling fan is more convenient.

[0098] In an embodiment, the first adjusting device 44 comprises a telescopic limiting structure, one end of which is connected with the first stop structure 42, and the other end of which is connected with the other one of the motor rotor 2 or the motor stator 1; the first stop structure 42 is rotatably arranged on the other one of the motor rotor 2 or the motor stator 1; when the telescopic limiting structure is in the extended state, the first stop structure 42 rotates to the second position; and when the telescopic limiting structure is in the retracted state, the first stop structure 42 rotates to the first position.

[0099] In actual use, when the position of the first stop structure 42 needs to be adjusted to the first position, the telescopic limiting structure can be adjusted to the retracted state. During the retraction of the telescopic limiting structure, the first stop structure 42 is driven to rotate to the first position, so that the first stop structure 42 is disengaged from the first clamping groove 41. When the position of the first stop structure 42 needs to be adjusted to the second position, the telescopic limiting structure can be adjusted to the extended state. During the extension of the telescopic limiting structure, the first stop structure 42 is driven to rotate to the second position, so that the first stop structure 42 is engaged with the first clamping groove 41. When the first stop structure 42 is located at the second position, the first elastic support structure 43 mainly supports the first stop structure 42. During the reverse rotation of the motor rotor 2 relative to the motor stator 1, the first stop structure 42 repeatedly engages and disengages from the first clamping groove 41, and the telescopic limiting structure repeatedly extends and retracts in a small stroke, so as to realize the one-way limiting rotation of the motor rotor 2 relative to the motor stator 1.

[0100] In the specific embodiment, the first adjusting device 44 includes a telescopic limiting structure. The telescopic limiting structure adjusts the position of the first stop structure 42 by adjusting the telescopic state, so as to realize the one-way limiting rotation of the motor rotor 2 relative to the motor stator 1. In addition, compared with the limiting ring 441, the telescopic limiting structure in the specific embodiment does not need to rotate around the motor stator 1, and the operation process is more convenient.

[0101] On the basis of the above-mentioned embodiment, the other end of the telescopic limiting structure can be connected to the motor stator 1. The first adjusting device 44 further includes a second electromagnet for controlling the extension of the telescopic limiting structure. The second electromagnet is arranged on one of the telescopic limiting structure and the motor stator 1, and the other of the telescopic limiting structure and the motor stator 1 is provided with a second magnetic attraction member for being attracted to the second electromagnet. When the second electromagnet is powered on, the second electromagnet is attracted to the second magnetic attraction member, and the telescopic limiting structure is in the retracted state. When the second electromagnet is powered off, the second electromagnet is disengaged from the second magnetic attraction member, and the telescopic limiting structure is in the extended state under the elastic force of the first elastic support structure 43.

[0102] In the embodiment, the adjustment of the extension state of the telescopic limiting structure can be realized by controlling the on-off of the second electromagnet, the adjustment process is convenient, and the automation of the working process of the anti-reverse heat dissipation fan is facilitated. In addition, in the embodiment, the first elastic supporting structure 43 can elastically support the telescopic limiting structure, so that when the first stop structure 42 is located at the second position, the first stop structure 42 can enter the first clamping groove 41 under the elastic force of the first elastic supporting structure 43 during the rotation of the motor rotor 2 relative to the motor stator 1, and the clamping of the first stop structure 42 and the first clamping groove 41 is realized. At the same time, when the motor rotor 2 rotates relative to the motor stator 1 in the forward direction, the first stop structure 42 can compress the first elastic supporting structure 43, and the temporary release of the clamping of the first stop structure 42 and the first clamping groove 41 is realized.

[0103] In an embodiment, the first clamping groove 41 can include an arc-shaped guide surface and a first limiting plane, the first limiting plane extends along the radial direction of the motor rotor 2 or the motor stator 1, one end of the arc-shaped guide surface is connected with the first limiting plane, and the other end of the arc-shaped guide surface extends to the inner side surface of the motor rotor 2 or the outer side surface of the motor stator 1; the first stop structure 42 is provided with an arc-shaped sliding surface for cooperating with the arc-shaped guide surface and a second limiting plane for cooperating with the first limiting plane.

[0104] In combination with the embodiments shown in Figure 1 , Figure 2 , Figure 4 , Figure 5 , in actual use, when the first stop structure 42 is located at the second position and the motor rotor 2 rotates relative to the motor stator 1 in the reverse direction, the first limiting plane and the second limiting plane are in close contact, and at this time the motor rotor 2 cannot rotate relative to the motor stator 1; when the motor rotor 2 rotates relative to the motor stator 1 in the forward direction, the arc-shaped guide surface of the first clamping groove 41 slides along the arc-shaped sliding surface until the first stop structure 42 is separated from the first clamping groove 41, and when it rotates to the next first clamping groove 41, the first stop structure 42 enters the first clamping groove 41 under the elastic force of the first elastic supporting structure 43, the motor rotor 2 continues to rotate relative to the motor stator 1 in the reverse direction, the arc-shaped guide surface of the first clamping groove 41 slides along the arc-shaped sliding surface until the first stop structure 42 is separated from the first clamping groove 41, and the process is repeated to realize the rotation of the motor rotor 2 relative to the motor stator 1 in the reverse direction.

[0105] In the embodiment, by making the first clamping groove 41 include an arc-shaped guide surface and a first limiting plane, the one-way rotation of the motor rotor 2 relative to the motor stator 1 can be limited; in addition, the cooperation of the arc-shaped guide surface and the arc-shaped sliding surface can avoid the occurrence of jamming during the forward rotation of the motor rotor 2 relative to the motor stator 1, and ensure the smoothness of the forward rotation of the motor rotor 2 relative to the motor stator 1.

[0106] In a specific embodiment, the one-way limiting device 4 can be arranged to be movable along the axial direction of the motor stator 1; the one-way limiting device 4 comprises a first gear ring and a second gear ring, both of which are sleeved on the outer periphery of the motor stator 1.

[0107] The outer side of the first gear ring is provided with a second stop structure and a second elastic support structure, and the inner side of the motor rotor 2 is provided with a second clamping groove for cooperating with the second stop structure; the second stop structure is rotatably arranged on the first gear ring; one end of the second elastic support structure is connected to the second stop structure, and the other end of the second elastic support structure is connected to the first gear ring; when the one-way limiting device 4 is located at the first position, the second gear ring corresponds to the second clamping groove; when the one-way limiting device 4 is located at the second position, the second stop structure can cooperate with the second clamping groove.

[0108] The outer periphery of the second gear ring is not provided with other structures to ensure that when the second gear ring corresponds to the position of the motor rotor 2 provided with the second clamping groove, the second gear ring will not affect the rotation of the motor rotor 2 relative to the motor stator 1 in the forward or reverse direction.

[0109] The first gear ring and the second gear ring are fixedly connected; the anti-reverse cooling fan further comprises a second adjusting device for switching the one-way limiting device 4 between the first position and the second position, the second adjusting device comprising a third electromagnet, a third magnetic attraction member for attracting the third electromagnet, and a third elastic member, one of the third electromagnet and the third magnetic attraction member being arranged on the one-way limiting device 4, and the other of the third electromagnet and the third magnetic attraction member being arranged on the motor stator 1; one end of the third elastic member is connected to the one-way limiting device 4, and the other end of the third elastic member is connected to the motor stator 1.

[0110] In actual use, when it is necessary to make the motor rotor 2 rotate relative to the motor stator 1 in one direction, the third electromagnet can be controlled to be powered on, the third electromagnet and the third magnetic attraction member are attracted, and in the process of attracting the third electromagnet and the third magnetic attraction member, the one-way limiting device 4 moves to the second position, at this time, the second stop structure on the outer side of the first gear ring corresponds to the second clamping groove; when it is necessary to make the motor rotor 2 rotate relative to the motor stator 1 in the forward or reverse direction, the third electromagnet is controlled to be powered off, the third electromagnet and the third magnetic attraction member are released from attraction, and in the process of releasing the third electromagnet and the third magnetic attraction member from attraction, the one-way limiting device 4 moves to the first position under the elastic force of the second elastic support structure, at this time, the second gear ring corresponds to the second clamping groove.

[0111] Of course, the installation position of the second elastic support structure or the third electromagnet can also be adjusted, so that when the third electromagnet is powered off, the one-way limiting device 4 moves to the second position, and when the third electromagnet is powered on, the one-way limiting device 4 moves to the second position under the elastic force of the second elastic support structure; the specific determination is made according to the actual situation, which is not described here.

[0112] In the embodiment, the axial position of the first and second toothed rings is adjusted by controlling the movement of the one-way limiting device 4 along the axial direction of the motor stator 1. When the first toothed ring corresponds to the second clamping groove, the second stop structure does not contact the motor rotor 2 during the rotation of the motor rotor 2 relative to the motor stator 1, thereby effectively reducing the friction during the rotation of the motor rotor 2. The motor rotor 2 can rotate in both the forward and reverse directions relative to the motor stator 1. When the second toothed ring corresponds to the second clamping groove, the second stop structure is clamped and matched with the second clamping groove, so that the motor rotor 2 can only rotate in the forward direction relative to the motor stator 1. In addition, the control process of the movement of the one-way limiting device 4 along the axial direction of the motor stator 1 is relatively simple and easy to implement.

[0113] On the basis of the above embodiment, the anti-reverse heat dissipation fan further includes a turning detection member and an alarm device. The turning detection member is used to obtain second turning information of the fan blade 3. When the turning detection member detects that the fan blade 3 rotates in the reverse direction, the alarm device sends a warning information.

[0114] In view of the fact that some anti-reverse heat dissipation fans can only rotate in the forward direction, in the embodiment, the turning detection member and the alarm device are arranged, so that the turning information of the fan blade 3 can be found in time, and the alarm device sends a warning information when the fan blade 3 rotates in the reverse direction, which is beneficial for the staff to take measures in time.

[0115] In an embodiment, the fan blade 3 is of a split structure, and the fan blade 3 includes a first blade unit fixed to the motor rotor 2, a second blade unit reversibly arranged on the first blade unit, and a limiting structure for limiting the second blade unit from being reversed in the second direction.

[0116] In the initial state, the second blade unit extends along the extension direction of the first blade unit, and the first blade unit and the second blade unit are combined as the fan blade 3. When the fan blade 3 rotates in the forward direction, the first limiting surface contacts the second limiting surface, so that the first blade unit and the second blade unit maintain the initial state. When the fan blade 3 rotates in the reverse direction, the second blade unit is reversed relative to the first blade unit, the first limiting surface is separated from the second limiting surface, and the length of the fan blade 3 is reduced. Specifically, the second blade unit can be reversed to the back of the first blade unit, or the second blade unit can be reversed to a position where the included angle between the extension direction and the extension direction of the first blade unit is less than or equal to 90°.

[0117] Further, the elastic reset structure can be arranged, one end of the elastic reset structure is connected with the first blade unit, and the other end of the elastic reset structure is connected with the second blade unit; in actual use, when the fan blade 3 stops rotating, under the elastic force of the elastic reset structure, the second blade unit is flipped to a position where the first limiting surface and the second limiting surface are in contact.

[0118] In the embodiment, the fan blade 3 is arranged in a split structure, in actual use, even if the motor rotor 2 reversely rotates relative to the motor stator 1, the second blade unit is flipped to a position where the included angle between the extension direction of the second blade unit and the extension direction of the first blade unit is less than or equal to 90°, the stress area of the fan blade 3 can be effectively reduced, the rotating speed of the fan blade 3 is reduced, and the adverse effect of the reverse rotation of the motor rotor 2 relative to the motor stator 1 is reduced; in the case of accidental damage of the one-way limiting device 4, the loss is minimized as much as possible, and the reverse rotation cooling fan and related equipment can be effectively protected.

[0119] In addition to the reverse rotation prevention cooling fan, the application further provides a server comprising a server body, a cooling module and a power module, the cooling module and the power module each comprise the reverse rotation prevention cooling fan of any one of the above.

[0120] In actual use, when the reverse rotation prevention cooling fan is used normally, the one-way limiting device 4 can be controlled to be located at the first position, the motor rotor 2 is controlled to rotate in the positive direction relative to the motor stator 1, and the rotating speed can be adjusted according to actual conditions.

[0121] When the reverse rotation prevention cooling fan is pulled out, the one-way limiting device 4 is adjusted to the second position, due to the effect of inertia, the fan blade 3 continues to rotate in the positive direction and stops rotating; after the fan blade 3 stops rotating, since the one-way limiting device 4 is located at the second position, the reverse rotation of the fan blade 3 can be avoided.

[0122] When the reverse rotation prevention cooling fan is inserted into the server system, first, the one-way limiting device 4 is adjusted to the second position to avoid the reverse rotation of the fan blade 3, then the motor rotor 2 is controlled to drive the fan blade 3 to rotate in the positive direction until the rotating speed of the fan blade 3 is greater than a preset rotating speed, at this time, the one-way limiting device 4 is adjusted to the first position, and the motor rotor 2 is controlled to drive the fan blade 3 to continue to rotate in the positive direction.

[0123] When software upgrade is needed in the server, the anti-reverse cooling fan needs to be paused for a period of time, first control the motor rotor 2 to stop rotating, the fan blade 3 will continue to rotate forward due to inertia, when the forward rotating speed of the fan blade 3 is less than the preset rotating speed, control the one-way limiting device 4 to switch to the second position, until the fan blade 3 stops rotating. When the anti-reverse cooling fan needs to be started again, first need to judge whether the one-way limiting device 4 is located in the second position, only in the case that the one-way limiting device 4 is located in the second position, the fan blade 3 can be controlled to rotate forward, until the forward rotating speed of the fan blade 3 is greater than the preset rotating speed, control the one-way limiting device 4 to switch to the first position, and control the fan blade 3 to continue to rotate forward.

[0124] In the server in the specific embodiment, the anti-reverse cooling fan is arranged in the power module and the cooling module, so that the heat maintenance is convenient, and the situation that the anti-reverse cooling fan and the power module cannot be normally started due to the reverse rotation of the fan caused by the negative air pressure in the system after the anti-reverse cooling fan and the power module are inserted into the system can be prevented. In addition, the application can solve the problem of the reverse rotation of the fan caused by the software upgrade of the fan, and solve the problem of the online upgrade of the fan.

[0125] It should also be noted that the terms such as first and second in the specification are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment. Without more limitation, the element defined by the statement "including a" does not exclude the presence of other identical elements in the process, method, article or equipment including the element.

[0126] The anti-reverse cooling fan and the server provided by the application are described in detail above. The embodiments in the specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same or similar parts of each embodiment can be referred to each other. For the system disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the method part. It should be pointed out that for ordinary skilled in the art, without departing from the principle of the application, some improvements and modifications can be made to the application, and these improvements and modifications also fall within the protection scope of the application.

Claims

1. An anti-reverse cooling fan, characterized in that: include: Motor stator (1); A motor rotor (2) is rotatably sleeved on the outer periphery of the motor stator (1) around the axial direction of the motor; Fan blades (3) are arranged on the outer peripheral side of the motor rotor (2); A one-way limiting device (4) is provided between the motor rotor (2) and the motor stator (1), and the one-way limiting device (4) can be switched to a first position or a second position; When the one-way limiting device (4) is located at the first position, the motor rotor (2) can rotate in the forward direction or the reverse direction relative to the motor stator (1); when the one-way limiting device (4) is located at the second position, the motor rotor (2) can rotate in the forward direction relative to the motor stator (1) and is locked in the reverse direction; The one-way limiting device (4) is movably arranged along the axial direction of the motor stator (1); the one-way limiting device (4) comprises a first gear ring and a second gear ring, and the first gear ring and the second gear ring are both sleeved on the outer periphery of the motor stator (1); The outer side surface of the first gear ring is provided with a second stop structure and a second elastic support structure, and the inner side surface of the motor rotor (2) is provided with a second clamping groove for cooperating with the second stop structure; the second stop structure is rotatably provided on the first gear ring; one end of the second elastic support structure is connected to the second stop structure, and the other end of the second elastic support structure is connected to the first gear ring; when the one-way limiting device (4) is located in the first position, the second gear ring corresponds to the second clamping groove; when the one-way limiting device (4) is located in the second position, the second stop structure cooperates with the second clamping groove; The first ring gear is fixedly connected to the second ring gear.

2. The anti-reverse cooling fan according to claim 1, characterized in that: The one-way limiting device (4) comprises: A first slot (41) is provided on one of the motor rotor (2) or the motor stator (1); a first stop structure (42) movably disposed on the other of the motor rotor (2) or the motor stator (1) between the first position and the second position; A first elastic support structure (43), one end of which is connected to the first stop structure (42) and the other end of which is connected to the first adjustment device (44); The first adjustment device (44) is provided on the other of the motor rotor (2) or the motor stator (1), and the first adjustment device (44) is used to adjust the telescopic state of the first elastic support structure (43) so as to switch the first stop structure (42) to the first position or the second position.

3. The anti-reverse cooling fan according to claim 2, characterized in that: The first adjustment device (44) comprises a limiting ring (441) and a limiting block (442) arranged on the limiting ring (441); the limiting ring (441) is rotatably arranged on the other of the motor rotor (2) and the motor stator (1) between a first angular position and a second angular position; the first stop structure (42) is rotatably arranged on the limiting ring (441); When the limiting ring (441) rotates to the first angular position, the first elastic support structure (43) is in a stretched state, and the first stop structure (42) is in the first position; When the limiting ring (441) rotates to the second angular position, the first elastic support structure (43) is in a compressed state, the first stop structure (42) is in the second position, and the first stop structure (42) is in contact with the limiting block (442) to limit the first stop structure (42) from rotating toward the side close to the limiting block (442).

4. The anti-reverse cooling fan according to claim 3, characterized in that: The limiting ring (441) is sleeved on the outer circumference of the motor stator (1); the first adjustment device (44) further comprises an angular position adjustment component for controlling the rotation of the limiting ring (441), the angular position adjustment component comprising: a first elastic member, one end of which is connected to the limiting ring (441) and the other end of which is connected to the motor stator (1); a first electromagnet, wherein one of the limiting ring (441) and the motor stator (1) is provided with the first electromagnet, and the other of the limiting ring (441) and the motor stator (1) is provided with a first magnetic attraction member for attracting the first electromagnet; When the first electromagnet is powered on, the first electromagnet is attracted to the first magnetic member, and the limiting ring (441) rotates to the first angular position; when the first electromagnet is powered off, the first electromagnet is disengaged from the first magnetic member, and the limiting ring (441) rotates to the second angular position under the elastic force of the first elastic member.

5. The anti-reverse cooling fan according to claim 4, characterized in that: Also includes: A first information acquisition device (7) is used to acquire rotational speed information and first direction information of the motor rotor (2); A second information acquisition device (8) for acquiring position information of the limit ring (441); A controller (6) is used to adjust the position of the limit ring (441) according to the rotation speed information, the first steering information and the position information.

6. The anti-reverse cooling fan according to claim 2, characterized in that: The first adjustment device (44) includes a telescopic limiting structure, one end of the telescopic limiting structure is connected to the first stop structure (42), and the other end is connected to the other of the motor rotor (2) or the motor stator (1); the first stop structure (42) is rotatably arranged on the other of the motor rotor (2) or the motor stator (1); When the telescopic limiting structure is in an extended state, the first stop structure (42) rotates to the second position; When the telescopic limiting structure is in a retracted state, the first stopping structure (42) rotates to the first position.

7. The anti-reverse cooling fan according to claim 6, characterized in that: The other end of the telescopic limit structure is connected to the motor stator (1); the first adjustment device (44) further includes a second electromagnet for controlling the extension of the telescopic limit structure, the second electromagnet being provided on one of the telescopic limit structure and the motor stator (1), and the other of the telescopic limit structure and the motor stator (1) being provided with a second magnetic attraction member for attracting the second electromagnet; When the second electromagnet is powered on, the second electromagnet is attracted to the second magnetic member, and the telescopic limiting structure is in a retracted state; when the second electromagnet is powered off, the second electromagnet is released from the second magnetic member, and the telescopic limiting structure is in an extended state under the elastic force of the first elastic support structure (43).

8. The anti-reverse cooling fan according to claim 2, characterized in that: The first clamping groove (41) includes an arc-shaped guide surface and a first limiting plane, the first limiting plane extending along the radial direction of the motor rotor (2) or the motor stator (1), one end of the arc-shaped guide surface is connected to the first limiting plane, and the other end of the arc-shaped guide surface extends to the inner side surface of the motor rotor (2) or the outer side surface of the motor stator (1); The first stopping structure (42) is provided with an arcuate sliding surface for cooperating with the arcuate guide surface and a second limiting plane cooperating with the first limiting plane.

9. The anti-reverse cooling fan according to any one of claims 1 to 7, characterized in that: The anti-reverse cooling fan further comprises a second adjustment device for driving the one-way limiting device (4) to switch between the first position and the second position, the second adjustment device comprising a third electromagnet, a third magnetic member for engaging with the third electromagnet, and a third elastic member, one of the third electromagnet and the third magnetic member being arranged on the one-way limiting device (4), and the other of the third electromagnet and the third magnetic member being arranged on the motor stator (1); one end of the third elastic member being connected to the one-way limiting device (4), and the other end of the third elastic member being connected to the motor stator (1); The anti-reversal cooling fan further comprises a steering detection member and an alarm device, wherein the steering detection member is used to obtain second steering information of the fan blade (3), and when the steering detection member detects that the fan blade (3) is rotating in the reverse direction, the alarm device issues a warning message.

10. A server, characterized in that: The server comprises a server body, a heat dissipation module and a power supply module, wherein the heat dissipation module and the power supply module both comprise the anti-reversal heat dissipation fan according to any one of claims 1 to 9.

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