阅读说明：本技术 一种具有防回流的计算机风扇 (Computer fan with anti-return ) 是由 章丽 于 2019-11-25 设计创作，主要内容包括：本发明属于风扇技术领域,尤其涉及一种具有防回流的计算机风扇,它包括基座、固定于基座上的支架、安装于支架上的驱动电机、安装于驱动电机输出轴上的风扇本体,该风扇,因增加的控制装置使得风扇的可靠性降低,实用性减小；特别是长时间使用风扇内的第一弹簧会受损失效,扇叶不能进行正常侧摆或复位；这种状态下,本发明中通过风力驱动不能正常侧摆的扇叶进行摆动打开,而在复位的时候,通过复位弹簧下压调节环,调节环驱动未复位的扇叶摆动复位,实现了第一弹簧受损后,对应扇叶的打开和复位功能；另外,本发明设计的滑块与滑套的脱开机结构保证了第一弹簧损坏情况下,风扇在风的作用下摆动时不会受到滑块与固定轴螺纹配合的限制。(The invention belongs to the technical field of fans, and particularly relates to a computer fan with backflow prevention, which comprises a base, a bracket fixed on the base, a driving motor arranged on the bracket, and a fan body arranged on an output shaft of the driving motor, wherein the fan is reduced in reliability and reduced in practicability due to the addition of a control device; particularly, the first spring in the fan can be damaged and failed after long-time use, and the fan blades can not normally sway laterally or reset; in the state, the fan blades which cannot normally swing laterally are driven to swing and open by wind power, and when the fan blades are reset, the adjusting ring is pressed down by the reset spring and drives the fan blades which are not reset to swing and reset by the adjusting ring, so that the opening and resetting functions of the corresponding fan blades are realized after the first spring is damaged; in addition, the structure of the disconnecting machine for the sliding block and the sliding sleeve ensures that the fan cannot be limited by the threaded matching of the sliding block and the fixed shaft when swinging under the action of wind under the condition that the first spring is damaged.)

1. The utility model provides a computer fan with anti-return, it includes the base, is fixed in the support on the base, installs driving motor on the support, installs the fan body on the driving motor output shaft, its characterized in that: the fan body consists of a rotor and fan blades, one end of the rotor is provided with a nested circular groove, the rotor is nested at one end of the driving motor, which is provided with an output shaft, through the nested circular groove, and the inner end surface of the nested circular groove is fixedly connected with the output shaft of the driving motor; the plurality of fan blades are uniformly arranged on the outer circular surface of the rotor in the circumferential direction, a control device is arranged between each fan blade and the rotor, and the control device controls the fan blades to swing through the radial centrifugal motion of the centrifugal force generated by the rotation of the rotor; one end of the rotor, which is far away from the driving motor, is provided with an adjusting device;

the adjusting device comprises a spring mounting plate, an adjusting ring and a return spring, wherein the spring mounting plate is fixedly mounted on one side of the rotor, which is far away from the driving motor; the adjusting ring is arranged on the outer circular surface of the rotor in a sliding fit manner; and a return spring is arranged between the adjusting ring and the spring mounting plate.

2. The computer fan with backflow prevention as claimed in claim 1, wherein: the outer circular surface of the rotor is uniformly provided with a plurality of circular openings in the circumferential direction, one end of each circular opening, which is far away from the outer circular surface of the rotor, is provided with an installation ring groove, the inner circular surface of each installation chute is uniformly provided with two first guide grooves and two third guide grooves in the circumferential direction, the symmetrical surfaces of the two third guide grooves and the symmetrical surfaces of the two first guide grooves are vertical to each other, and the inner end surface of each installation chute is provided with an installation circular groove;

the control device comprises a first spring, a second spring, a sliding sleeve, a sliding block and a fixed shaft, wherein an external thread is arranged on the outer circular surface of the fixed shaft, the fixed shaft is arranged on the rotor through a circular opening, one end of the sliding sleeve is an opening end, a circular hole is formed in the other end of the sliding sleeve, two second guide grooves are uniformly formed in the inner circular surface of the sliding sleeve in the circumferential direction, two first guide blocks are uniformly arranged in the outer circular surface of the sliding sleeve in the circumferential direction, and the sliding sleeve is arranged in corresponding mounting sliding grooves through the sliding fit of the two first guide blocks and the two third guide grooves; the sliding block is composed of a mounting disc and a sliding disc, the mounting disc is fixedly connected with the sliding disc, an internal thread is arranged on the inner circular surface of the sliding block, two second guide blocks are uniformly and circumferentially arranged on the outer circular surface of the mounting disc, two third guide blocks are uniformly and circumferentially arranged on the outer circular surface of the sliding disc, the sliding block is arranged on the sliding sleeve through the sliding fit of the two third guide blocks on the sliding disc and the two second guide grooves formed on the sliding sleeve, the two second guide blocks on the mounting disc on the sliding block are in sliding fit with the two first guide grooves formed in the corresponding mounting ring groove, and meanwhile, the two second guide blocks can swing in the corresponding two first guide grooves; the internal thread on the sliding block is in threaded fit with the external thread on the fixed shaft; a second spring is arranged between the sliding disc and the inner end face of the sliding sleeve; a first spring is arranged between the sliding disc and a mounting circular groove which is opened in the corresponding mounting sliding groove; the first spring is an extension spring and has pretension; the second spring is a compression spring and has pre-pressure; the thread lead angle of the external thread on the fixed shaft is more than 45 degrees and less than 70 degrees; the thread lead angle of the internal thread on the sliding sleeve is larger than 45 degrees and smaller than 70 degrees.

3. The computer fan with backflow prevention as claimed in claim 2, wherein: all install one on the fixed axle of installation on the above-mentioned rotor and prevent that the fixed axle roll-off corresponds the spacing dish of installation spout.

4. The computer fan with backflow prevention as claimed in claim 2, wherein: the thread lead angle of the external thread on the fixed shaft is 60 degrees; the thread lead angle of the internal thread on the sliding sleeve is 60 degrees.

5. The computer fan with backflow prevention as claimed in claim 1, wherein: under the condition that the first spring and the second spring are not damaged, the sliding disk of the sliding block is always positioned in the sliding sleeve.

6. The computer fan with backflow prevention as claimed in claim 1, wherein: the driving motor is detachably arranged on the bracket.

7. The computer fan with backflow prevention as claimed in claim 1, wherein: the outer circle surface of the rotor is uniformly provided with a plurality of avoidance notches for preventing the fan blades from interfering with the outer circle surface of the rotor in the swinging process in the circumferential direction.

8. The computer fan with backflow prevention as claimed in claim 2, wherein: the fixed shaft is detachably connected with the corresponding fan blades.

9. The computer fan with backflow prevention as claimed in claim 1, wherein: the fixed shaft is connected with the corresponding round opening through a bearing.

10. The computer fan with backflow prevention as claimed in claim 1, wherein: the spring mounting plate is fixedly mounted on the end face of one side, far away from the driving motor, of the rotor in a welding mode.

Technical Field

The invention belongs to the technical field of fans, and particularly relates to a computer fan with backflow prevention.

Background

Along with the rapid update of electronic products, the hardware performance of computers is more and more powerful, which inevitably results in that the computer hardware with good performance can generate a large amount of heat when in use, and the temperature of the computer hardware is too high when in work, so that the use performance of the computer hardware can be greatly reduced, therefore, a heat dissipation mechanism needs to be arranged to effectively dissipate heat, and the hardware is ensured to keep high-performance operation for a long time.

In a computer, a plurality of fans are usually installed to dissipate heat of electronic components in the electronic product. However, when some fans stop rotating due to a fault, the fault fan may generate an air flow backflow, thereby causing an air flow disturbance and affecting the heat dissipation of the system.

For the fan fixing device designed in the publication No. 103906408, in order to solve the problem, a first wind-blocking sheet and a second wind-blocking sheet are arranged on the fan frame, and the first wind-blocking sheet and the second wind-blocking sheet vertically cover the side of the fan vent opposite to the fan through the action of gravity, so that the backflow wind flow can be blocked; however, when a certain wind-blocking sheet structure in the shielding mechanism breaks down, the whole fan frame is inevitably replaced instead of maintained according to the current after-sale service rule, and when the fan unit on the original fan frame is replaced, the fan unit needs to be detached and reinstalled on a newly replaced mounting frame, so that the operation is very troublesome, and the replacement performance is relatively low. In addition, the baffle plate of the patent depends on the gravity action, so the installation axis of the fan unit of the baffle plate is required to be horizontally arranged, and the installation flexibility of the fan unit is influenced.

The present invention is directed to a computer fan with backflow prevention to solve the above problems.

Disclosure of Invention

In order to solve the above defects in the prior art, the invention discloses a computer fan with backflow prevention, which is realized by adopting the following technical scheme.

The utility model provides a computer fan with anti-return, it includes the base, is fixed in the support on the base, installs driving motor on the support, installs the fan body on the driving motor output shaft, its characterized in that: the fan body consists of a rotor and fan blades, one end of the rotor is provided with a nested circular groove, the rotor is nested at one end of the driving motor, which is provided with an output shaft, through the nested circular groove, and the inner end surface of the nested circular groove is fixedly connected with the output shaft of the driving motor; the installation mode of the rotor designed by the invention is the same as that of the rotor in the traditional computer fan; one end of the rotor is nested on the driving motor and is overlapped with the driving motor into a part, so that the design has the advantages that the occupied space of the driving motor and the rotor can be reduced, the structure distribution of the fan is compact, and the occupied space of the fan in a computer shell is reduced; the plurality of fan blades are uniformly arranged on the outer circular surface of the rotor in the circumferential direction, a control device is arranged between each fan blade and the rotor, and the control device controls the fan blades to swing through the radial centrifugal motion of the centrifugal force generated by the rotation of the rotor; in the working state, the corresponding fan blades can swing by a certain angle relative to the horizontal state through the control device, the angle is basically the same as the angle of the fan blades arranged on the rotor in the traditional fan, and the fan blades can normally work under the angle to dissipate heat of the computer; and one end of the rotor, which is far away from the driving motor, is provided with an adjusting device.

The adjusting device comprises a spring mounting plate, an adjusting ring and a return spring, wherein the spring mounting plate is fixedly mounted on one side of the rotor, which is far away from the driving motor; the adjusting ring is arranged on the outer circular surface of the rotor in a sliding fit manner; and a return spring is arranged between the adjusting ring and the spring mounting plate.

As a further improvement of the present technology, a plurality of circular ports are uniformly circumferentially opened on the outer circumferential surface of the rotor, an installation ring groove is formed at one end of each circular port, which is far away from the outer circumferential surface of the rotor, two first guide grooves and two third guide grooves are uniformly circumferentially opened on the inner circumferential surface of each installation chute, the symmetric surfaces of the two third guide grooves and the symmetric surfaces of the two first guide grooves are perpendicular to each other, and an installation circular groove is formed on the inner end surface of each installation chute.

The control device comprises a first spring, a second spring, a sliding sleeve, a sliding block and a fixed shaft, wherein one end of the sliding sleeve is an open end, an external thread is arranged on the outer circular surface of the fixed shaft, the fixed shaft is installed on the rotor through a circular opening, a circular hole is formed in the other end of the sliding sleeve, two second guide grooves are uniformly formed in the inner circular surface of the sliding sleeve in the circumferential direction, two first guide blocks are uniformly installed on the outer circular surface of the sliding sleeve in the circumferential direction, and the sliding sleeve is installed in corresponding installation sliding grooves through the sliding fit of the two first guide blocks and the two third guide grooves; the sliding block is composed of a mounting disc and a sliding disc, the mounting disc is fixedly connected with the sliding disc, an internal thread is arranged on the inner circular surface of the sliding block, two second guide blocks are uniformly and circumferentially arranged on the outer circular surface of the mounting disc, two third guide blocks are uniformly and circumferentially arranged on the outer circular surface of the sliding disc, the sliding block is arranged on the sliding sleeve through the sliding fit of the two third guide blocks on the sliding disc and the two second guide grooves formed on the sliding sleeve, the two second guide blocks on the mounting disc on the sliding block are in sliding fit with the two first guide grooves formed in the corresponding mounting ring groove, and meanwhile, the two second guide blocks can swing in the corresponding two first guide grooves; the internal thread on the sliding block is in threaded fit with the external thread on the fixed shaft; a second spring is arranged between the sliding disc and the inner end face of the sliding sleeve; a first spring is arranged between the sliding disc and a mounting circular groove which is opened in the corresponding mounting sliding groove; the first spring is an extension spring and has pretension; the second spring is a compression spring and has pre-pressure; the thread lead angle of the external thread on the fixed shaft is more than 45 degrees and less than 70 degrees; the thread lead angle of the internal thread on the sliding sleeve is larger than 45 degrees and smaller than 70 degrees.

In the invention, under the condition that the fan does not work, the sliding sleeve is positioned on one side of the mounting chute close to the axle center of the rotor under the action of the first spring.

Under the normal working state, when the rotor rotates, the rotor can enable the sliding sleeve and the sliding block which are arranged on the rotor to slide to one side close to the outer circular surface of the rotor under the action of centrifugal force, the sliding sleeve is arranged in the corresponding installation sliding chute through the sliding fit of the two first guide blocks and the two third guide grooves, the sliding block is arranged on the sliding sleeve through the sliding fit of the two third guide blocks on the sliding disc and the two second guide grooves which are formed in the sliding sleeve, and the sliding block and the sliding sleeve are kept in a relatively static state under the action of the tension of the first spring and the pressure of the second spring; when the fan breaks down, the rotor stops rotating, the sliding block and the sliding sleeve lose centrifugal force, the sliding block and the sliding sleeve can reversely reset and slide under the action of the first spring, the sliding block drives the fixed shaft to rotate in the sliding process, and the fixed shaft rotates to drive the fan blades to reversely swing and reset.

After long-time use, because the fatigue degrees of the first springs are different and the resistance at the rotating or sliding fit position is different, the resistance on each fan blade is different in the opening process of the fan blades, and the centrifugal force on the sliding block drives the fixed shaft to drive the fan blades to swing in the opening process of the fan blades to be different; the fan blades with larger resistance have smaller rotating speed of the corresponding fixed shafts, so that the condition that the final rotating angle is smaller than the normal working angle can occur, namely the opening amplitude of the fan blades can be smaller than the normal opening amplitude; the fan blades with smaller resistance can smoothly swing to a normal working angle, and the final working angles of the fan blades with different resistances are different, so that the pushing action on wind is different, and the pulsation can occur among the fan blades; in order to prevent the pulsation, the invention designs the adjusting ring, when the total thrust is greater than the elastic force of the return spring in the opening process of the fan blade with larger opening amplitude, the fan blade can extrude the adjusting ring to move the adjusting ring upwards relative to the rotor, the movement of the adjusting ring can extrude the return spring to press the return spring, the return spring reversely applies pressure to the adjusting ring, the adjusting ring transmits the pressure to the fan blade with larger opening amplitude to provide resistance for the fan blade with larger opening amplitude, the fan blade with larger opening amplitude can be subjected to two types of resistance at the moment, the resistance of the fan blade swinging and the resistance applied by the adjusting ring, in this state, the clearance is formed between the fan blade with smaller opening amplitude and the adjusting ring due to the upward movement of the adjusting ring, the fan blade with smaller opening amplitude is not limited by the adjusting ring, only the resistance of swinging is realized, and the difficulty of the sliding block driving the corresponding fixed shaft to, the opening angle difference of each fan blade is reduced, the fan blades arranged on the rotor are synchronously adjusted to a certain extent through the reset spring and the adjusting ring, and pulsation is reduced.

The first spring in the invention is always stretched in a reciprocating way relative to the second spring, and has smaller volume relative to the return spring, so that the first spring in the control device is most easily damaged when being stretched in a reciprocating way and returned after being used for a long time.

If one of the first springs in the control device is damaged and loses the pulling force on the corresponding slide block, the related structure change corresponding to the first spring caused by the damage of the first spring is as follows (taking the non-working state of the fan as an example): under the action of the second spring, the sliding block can slide towards one side far away from the sliding sleeve, because the sliding sleeve is arranged in the corresponding installation sliding groove through the sliding fit of the two first guide blocks and the two third guide grooves, the sliding block is arranged on the sliding sleeve through the sliding fit of the two third guide blocks on the sliding disc and the two second guide grooves formed in the sliding sleeve, the sliding block can only slide relative to the sliding sleeve and cannot rotate, the sliding block can drive the fixed shaft to rotate by sliding, the fixed shaft drives the fan blades to swing, after the sliding disc of the sliding block is separated from the sliding sleeve, the sliding sleeve loses the limit on the rotating direction of the sliding block, and the second spring is completely released; the fan blade corresponding to the damaged first spring swings by a small angle; in this state, a corresponding small gap appears in the merged blades, but the gap does not have a large influence on the backflow of the wind, compared with the case that the blades are completely opened.

After the first spring is damaged and loses the pulling force on the sliding block, the structure corresponding to the damaged first spring after the fan starts to work again operates as follows: under the action of the second spring, before the fan does not work, the sliding block slides to drive the fan blades to swing for a certain angle through the fixed shaft, and the sliding sleeve loses the limit on the sliding block, so that the second spring is completely released; when the fan starts to work, the fan blade can swing to a working position under the relative blowing of wind in the rotating process due to small-amplitude swing displacement generated before the fan blade, and the structure of the disconnecting machine for the sliding block and the sliding sleeve ensures that the fan cannot be limited by the threaded matching of the sliding block and the fixed shaft when swinging under the action of wind under the condition that the first spring is damaged. In the process of swinging the working position, the sliding block and the fixed shaft rotate and slide, the resistance of the two motions and the influence of centrifugal force are exerted, the sliding block can generate three different motion processes, firstly, the sliding block and the fixed shaft are relatively static, the sliding block can swing along with the fan blade under the driving of the fixed shaft, and until the fan blade swings, the second guide block arranged on the mounting disc of the sliding block just rotates to be in contact with the tail end of the first guide groove formed on the corresponding mounting sliding groove, and the sliding block does not touch the wall surface of one end of the mounting sliding groove close to the axle center of the rotor; in this state, the sliding block is self-locked with the fixed shaft in the rotating direction through threads and is in a static state; the sliding block can not slide relative to the fixed shaft; secondly, the sliding block slides and rotates relative to the fixed shaft under the action of centrifugal force, namely the sliding block and the fixed shaft continue to rotate under the matching of threads while the fan blades drive the fixed shaft to rotate, and after the fan blades swing, a second guide block arranged on an installation disc of the sliding block just rotates to the position where the starting end and the tail end of a first guide groove formed in a corresponding installation sliding groove are not contacted, and the sliding block does not contact with the wall surface of one end, close to the axis of the rotor, of the installation sliding groove; thirdly, the sliding block slides and rotates relative to the fixed shaft under the action of centrifugal force, but the sliding block rotates at a higher speed under the action of centrifugal force, before the fan blades swing, the sliding block touches the wall surface of one end, close to the axis of the rotor, of the mounting sliding groove, at the moment, the second guide block does not contact with the starting end and the tail end of the first guide groove formed in the corresponding mounting sliding groove, and then the fan blades continue to swing and can drive the sliding block to swing together through the fixed shaft until the fan blades swing. The fan can swing to a working state under the action of wind to normally work in any one of the three movement modes of the sliding block.

If the first spring in the control device is damaged and loses the pulling force on the sliding block, the undamaged first spring can drive the corresponding fan blade to swing flat when the fan is in a working state and the fan fails or is powered off, the damaged first spring loses the reset function on the corresponding fan blade, and the fan blade cannot swing to reset; under the flabellum that the drive of undamaged first spring corresponds was leveled the condition, the adjustable ring is because of losing most flabellum thrust upwards, will move down under reset spring's effect, the adjustable ring moves down will extrude the flabellum that does not swing, make the flabellum that does not swing to level, but because the first spring that corresponds with this flabellum is impaired, the second spring makes the slider that corresponds break away from with the sliding sleeve, lead to the flabellum to swing a small angle relative original horizontal state, so the flabellum after the combination can appear corresponding microgap in this flabellum department, be convenient for blow by wind, but this kind of clearance is opened for the flabellum completely, can not cause too big influence to the backward flow of wind.

The return spring designed by the invention has two functions, namely, in the process of opening the fan blades, the opening angles of the fan blades are different due to different resistance generated by long-time damage of the fan; in this state, the return spring applies downward pressure to the adjusting ring, so that the opening angle difference of each fan blade is reduced, and the effect of basically synchronously adjusting the fan blades is achieved; secondly, when the first spring in the control device loses the reset function of the corresponding fan blade due to long-time use loss, the adjusting ring is pressed down through the reset spring, and the fan blade which is not reset is pressed and moved through the adjusting ring to reset.

As a further improvement of the technology, a limiting disc for preventing the fixed shaft from sliding out of the corresponding mounting sliding groove is mounted on all the fixed shafts mounted on the rotor.

As a further improvement of the technology, the thread lead angle of the external thread on the fixed shaft is 60 degrees; the thread lead angle of the internal thread on the sliding sleeve is 60 degrees.

As a further improvement of the present technology, the sliding disk of the slider is always located in the slider case when neither the first spring nor the second spring is damaged.

As a further improvement of the technology, the driving motor is detachably mounted on the bracket.

As a further improvement of the technology, a plurality of avoiding gaps for preventing the fan blades from interfering with the outer circular surface of the rotor in the swinging process are uniformly formed on the outer circular surface of the rotor in the circumferential direction.

As a further improvement of the technology, the fixed shaft is detachably connected with the corresponding fan blades.

As a further improvement of the technology, the fixed shaft is connected with the corresponding round opening through a bearing; the fan blades can be cleaned at regular time.

As a further improvement of the present technology, the spring mounting plate is fixedly mounted on an end surface of the rotor on a side away from the driving motor by welding.

Compared with the traditional fan technology, the fan has the following beneficial effects:

1. when the fan used by the computer designed by the invention is used, the sliding block in the control device can drive the corresponding fan blade to swing by a certain angle under the action of centrifugal force, the angle is basically the same as the angle of the fan blade arranged on the rotor in the traditional fan, and the fan blade can normally work under the angle to dissipate heat of the computer; namely, the fan has the function of radiating heat of the fan arranged in the traditional computer.

2. The computer is usually provided with a plurality of fans, and when one fan fails, the fan stops rotating, at the moment, under the action of a first spring in a control device, fan blades on the fan can swing, reset and combine together to shield an air port of the fan to a certain extent, so that the problem that air flow backflow is generated at the failed fan, and the air flow is disordered to influence the heat dissipation of the system is avoided; meanwhile, the dust can be prevented from floating into the inner side of the fan after the fan breaks down to a certain extent.

3. The fan used by the computer designed by the invention has the advantages that the reliability of the fan is reduced due to the added control device, and the practicability is reduced; particularly, the first spring in the fan can be damaged and failed after long-time use, and the fan blades can not normally sway laterally or reset; in the state, the fan blades which cannot normally swing laterally are driven to swing and open by wind power, and when the fan blades are reset, the adjusting ring is pressed down by the reset spring and drives the fan blades which are not reset to swing and reset by the adjusting ring, so that the opening and resetting functions of the corresponding fan blades are realized after the first spring is damaged; in addition, the structure of the disconnecting machine for the sliding block and the sliding sleeve ensures that the fan cannot be limited by the threaded matching of the sliding block and the fixed shaft when swinging under the action of wind under the condition that the first spring is damaged.

4. The invention designs a structure integrating a wind shielding structure and a fan unit, when the fan unit has a problem, the fan unit is directly replaced, when the wind shielding mechanism has a problem, the fan unit corresponding to the wind shielding sheet is detached to replace a new fan unit, and after batch production, the simple replacement of the low-cost fan unit is more suitable for the current after-sale service compared with the fussy replacement operation in the comparison patent mentioned in the background.

5. The structure operation in the invention is not influenced by gravity, and the arrangement position and direction of the fan can be flexibly arranged according to the setting requirement.

Drawings

Fig. 1 is an external view of an entire part.

Fig. 2 is a schematic view of the overall component distribution.

Fig. 3 is a schematic view of the internal structure installation of the integral component.

Fig. 4 is a schematic view of the bracket mounting.

Fig. 5 is a schematic view of the adjustment device installation.

FIG. 6 is a schematic view of fan blade installation.

Fig. 7 is a schematic view of a rotor structure.

Fig. 8 is a schematic structural diagram of the control device.

Figure 9 is a schematic view of a sliding sleeve and slider installation.

Figure 10 is a schematic view of a sliding sleeve and slider configuration.

FIG. 11 is a schematic view of the blade and fixed shaft mounting.

Number designation in the figures: 1. a base; 2. a fan body; 3. an adjustment device; 4. a support; 5. a drive motor; 6. a spring mounting plate; 7. an adjusting ring; 8. a return spring; 9. a control device; 10. a fixed shaft; 11. nesting the circular grooves; 12. a rotor; 13. fixing a sleeve; 14. a first spring; 15. a sliding sleeve; 16. a slider; 17. a fan blade; 18. a limiting disc; 22. installing a chute; 23. avoiding the notch; 24. a circular port; 25. installing a circular groove; 26. a first guide groove; 27. a second spring; 28. an external thread; 29. a circular hole; 30. a second guide groove; 31. a first guide block; 32. a second guide block; 33. mounting a disc; 34. a sliding disk; 35. a third guide block; 36. an internal thread; 37. and a third guide groove.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples or figures are illustrative of the present invention and are not intended to limit the scope of the present invention.

As shown in fig. 1, 2 and 3, the fan comprises a base 1, a bracket 4 fixed on the base 1 as shown in fig. 4, a driving motor 5 installed on the bracket 4, and a fan body 2 installed on an output shaft of the driving motor 5, and is characterized in that: as shown in fig. 6, the fan body 2 is composed of a rotor 12 and fan blades 17, as shown in fig. 7, one end of the rotor 12 is provided with a nesting circular groove 11, as shown in fig. 3 and 5, the rotor 12 is nested at one end of the driving motor 5 provided with an output shaft through the nesting circular groove 11, and the inner end surface of the nesting circular groove 11 is fixedly connected with the output shaft of the driving motor 5; the rotor 12 of the present invention is mounted in the same manner as the rotor 12 of a conventional computer fan; one end of the rotor 12 is nested on the driving motor 5 and is overlapped with a part of the driving motor 5, so that the design has the advantages that the occupied space of the driving motor 5 and the rotor 12 can be reduced, the structure distribution of the fan is compact, and the occupied space of the fan in a computer shell is reduced; a plurality of fan blades 17 are circumferentially and uniformly arranged on the outer circumferential surface of the rotor 12, a control device 9 is respectively arranged between each fan blade 17 and the rotor 12, and the control device 9 controls the fan blades 17 to swing through the radial centrifugal motion of the centrifugal force generated by the rotation of the rotor 12; in the working state, the corresponding fan blade 17 can swing a certain angle relative to the horizontal state through the control device 9, the angle is basically the same as the angle of the fan blade 17 installed on the rotor 12 in the traditional fan, and the fan blade 17 can normally work under the angle to dissipate heat of the computer; the end of the rotor 12 remote from the drive motor 5 is fitted with an adjusting device 3.

As shown in fig. 3 and 5, the adjusting device 3 includes a spring mounting plate 6, an adjusting ring 7, and a return spring 8, wherein the spring mounting plate 6 is fixedly mounted on a side of the rotor 12 away from the driving motor 5; the adjusting ring 7 is arranged on the outer circular surface of the rotor 12 in a sliding fit manner; a return spring 8 is arranged between the adjusting ring 7 and the spring mounting plate 6.

As shown in fig. 7, a plurality of circular openings 24 are uniformly formed in the circumferential direction on the outer circumferential surface of the rotor 12, one end of each circular opening 24, which is away from the outer circumferential surface of the rotor 12, is formed with a mounting ring groove, two first guide grooves 26 and two third guide grooves 37 are uniformly formed in the circumferential direction on the inner circumferential surface of each mounting chute 22, the symmetric surfaces of the two third guide grooves 37 and the symmetric surfaces of the two first guide grooves 26 are perpendicular to each other, and one mounting ring groove 25 is formed on the inner circumferential surface of each mounting chute 22.

As shown in fig. 8 and 9, the control device 9 includes a first spring 14, a second spring 27, a sliding sleeve 15, a sliding block 16, and a fixed shaft 10, as shown in fig. 8 and 11, wherein an outer circumferential surface of the fixed shaft 10 has an external thread 28, the fixed shaft 10 is mounted on the rotor 12 through a circular opening 24, one end of the sliding sleeve 15 is an open end, the other end of the sliding sleeve 15 is opened with a circular hole 29, an inner circumferential surface of the sliding sleeve 15 is circumferentially and uniformly opened with two second guide grooves 30, an outer circumferential surface of the sliding sleeve 15 is circumferentially and uniformly mounted with two first guide blocks 31, and the sliding sleeve 15 is mounted in the corresponding mounting chute 22 through sliding engagement of the two first guide blocks 31 and the two third guide grooves 37; as shown in fig. 10, the slider 16 is composed of two parts, namely, a mounting disc 33 and a sliding disc 34, the mounting disc 33 is fixedly connected with the sliding disc 34, an internal thread 36 is arranged on the inner circular surface of the slider 16, two second guide blocks 32 are uniformly circumferentially arranged on the outer circular surface of the mounting disc 33, as shown in fig. 8 and 9, two third guide blocks 35 are uniformly circumferentially arranged on the outer circular surface of the sliding disc 34, the slider 16 is arranged on the sliding sleeve 15 through the sliding fit of the two third guide blocks 35 on the sliding disc 34 and the two second guide grooves 30 formed on the sliding sleeve 15, the two second guide blocks 32 on the mounting disc 33 on the slider 16 are slidably fitted with the two first guide grooves 26 formed in the corresponding mounting ring groove, and the two second guide blocks 32 can swing in the corresponding two first guide grooves 26; the internal thread 36 on the sliding block 16 is in threaded fit with the external thread 28 on the fixed shaft 10; a second spring 27 is arranged between the sliding disc 34 and the inner end surface of the sliding sleeve 15; a first spring 14 is arranged between the sliding disc 34 and the mounting circular groove 25 opened in the corresponding mounting sliding groove 22; the first spring 14 is an extension spring and has a pretension; the second spring 27 is a compression spring and has a pre-pressure; the thread lead angle of the external thread 28 on the fixed shaft 10 is more than 45 degrees and less than 70 degrees; the thread lead angle of the internal thread 36 on the sliding sleeve 15 is more than 45 degrees and less than 70 degrees.

In the present invention, in the state that the fan is not operated, the sliding sleeve 15 is positioned at one side of the mounting chute 22 close to the axle center of the rotor 12 under the action of the first spring 14.

In a normal working state, when the rotor 12 rotates, the rotor 12 can enable the sliding sleeve 15 and the sliding block 16 which are installed on the rotor 12 to slide to one side close to the outer circular surface of the rotor 12 under the action of centrifugal force, because the sliding sleeve 15 is installed in the corresponding installation sliding chute 22 through the sliding fit of the two first guide blocks 31 and the two third guide grooves 37, the sliding block 16 is installed on the sliding sleeve 15 through the sliding fit of the two third guide blocks 35 on the sliding disk 34 and the two second guide grooves 30 which are opened on the sliding sleeve 15, and under the action of the tension of the first spring 14 and the pressure of the second spring 27, the sliding block 16 and the sliding sleeve 15 keep a relative static state, at this time, when the sliding block 16 slides, the sliding block 16 can drive the fixed shaft 10 which is connected with the sliding block through threaded fit to rotate under the action of threads, and the fixed shaft 10 rotates to drive the corresponding fan; when the fan fails, the rotor 12 stops rotating, the sliding block 16 and the sliding sleeve 15 lose centrifugal force, at this time, the sliding block 16 and the sliding sleeve 15 can reversely reset and slide under the action of the first spring 14, the sliding block 16 drives the fixed shaft 10 to rotate in the sliding process, and the fixed shaft 10 rotates to drive the fan blades 17 to reversely swing and reset.

In the invention, after long-time use, because the fatigue degrees of the first spring 14 are different and the resistance at the rotating or sliding matching position is different, the resistance of each fan blade 17 is different in the opening process of the fan blades 17, and the centrifugal force applied to the sliding block 16 drives the fixed shaft 10 to drive the fan blades 17 to swing in the opening process of the fan blades 17 is different; the fan blade 17 with large resistance has a relatively low rotating speed of the corresponding fixed shaft 10, and the final rotating angle may be smaller than the normal working angle, that is, the opening amplitude of the fan blade 17 may be smaller than the normal opening amplitude; the fan blades 17 with smaller resistance can smoothly swing to a normal working angle, and because the final working angles of the fan blades 17 with different resistances are different, the pushing action on wind is different, so that pulsation can occur among the fan blades 17; in order to prevent the pulsation, the adjusting ring 7 is designed, in the opening process of the fan blade 17 with larger opening amplitude, when the total thrust is larger than the elastic force of the return spring 8, the fan blade 17 can extrude the adjusting ring 7 to move upwards relative to the rotor 12, the return spring 8 can be extruded by the movement of the adjusting ring 7, the return spring 8 is pressed, the return spring 8 reversely provides a pressure to the adjusting ring 7, the adjusting ring 7 transmits the pressure to the fan blade 17 with larger opening amplitude to provide a resistance to the fan blade 17 with larger opening amplitude, the fan blade 17 with larger opening amplitude can be subjected to two resistances at the moment, the resistance of the fan blade 17 swinging and the resistance applied by the adjusting ring 7, and in this state, the gap is formed between the fan blade 17 with smaller opening amplitude and the adjusting ring 7 due to the upward movement of the adjusting ring 7, and the fan blade 17 with smaller opening amplitude is not limited by the adjusting ring 7, the sliding block 16 drives the corresponding fixed shaft 10 to drive the fan blades 17 to swing only by the aid of swinging resistance, difficulty degree of the fan blades 17 to swing is relatively reduced, angle difference of opening of each fan blade 17 is reduced, the fan blades 17 mounted on the rotor 12 are synchronously adjusted to a certain extent through the return spring 8 and the adjusting ring 7, and pulsation is reduced.

The first spring 14 in the present invention is always stretched in a reciprocating manner with respect to the second spring 27, and is small in size with respect to the return spring 8, and damage is most likely to occur when the first spring 14 in the control device 9 is stretched in a reciprocating manner and returned after a long period of use.

If one of the first springs 14 in the control device 9 is damaged and loses the tension on the corresponding slider 16, the related structural changes corresponding to the first spring 14 caused by the damage of the first spring 14 are as follows (taking the fan non-operating state as an example): under the action of the second spring 27, the sliding block 16 can slide to one side far away from the sliding sleeve 15, because the sliding sleeve 15 is installed in the corresponding installation sliding chute 22 through the sliding fit of the two first guide blocks 31 and the two third guide grooves 37, the sliding block 16 is installed on the sliding sleeve 15 through the sliding fit of the two third guide blocks 35 on the sliding disk 34 and the two second guide grooves 30 opened on the sliding sleeve 15, the sliding block 16 can only slide relative to the sliding sleeve 15 and can not rotate, so the sliding block 16 can drive the fixed shaft 10 to rotate, the fixed shaft 10 drives the fan blades 17 to swing, when the sliding disk 34 of the sliding block 16 is separated from the sliding sleeve 15, the sliding sleeve 15 loses the limitation on the rotating direction of the sliding block 16, and at the moment, the second spring 27 is completely released; the fan blade 17 corresponding to the damaged first spring 14 swings through a small angle; in this state, a corresponding small gap will appear in the merged blades 17, but this gap will not have too great an effect on the return flow of the wind relative to a complete opening of the blades 17.

After the first spring 14 is damaged and loses the pulling force on the slider 16, the corresponding structure of the damaged first spring 14 after the fan starts to work again operates as follows: under the action of the second spring 27, before the fan does not work, the sliding block 16 slides and drives the fan blades 17 to swing for a certain angle through the fixed shaft 10, and the sliding sleeve 15 loses the limit on the sliding block 16, so that the second spring 27 is completely released; when the fan starts to work, the fan blade 17 can swing to a working position under the relative blowing of wind in the rotating process due to the small-amplitude swing displacement generated before, and the structure of the release machine of the sliding block 16 and the sliding sleeve 15 ensures that the fan cannot be limited by the threaded matching of the sliding block 16 and the fixed shaft 10 when swinging under the action of the wind under the condition that the first spring 14 is damaged. In the process of swinging the working position, the slider 16 and the fixed shaft 10 rotate and slide with the resistance and the centrifugal force, the slider 16 can have three different movement processes, firstly, the slider 16 and the fixed shaft 10 are relatively static, the slider 16 can swing along with the fan blades 17 under the driving of the fixed shaft 10, until the fan blades 17 swing, the second guide block 32 arranged on the mounting disc 33 of the slider 16 also just rotates to be in contact with the tail end of the first guide groove 26 arranged on the corresponding mounting chute 22, and the slider 16 does not touch the wall surface of the mounting chute 22 close to one end of the axis of the rotor 12; in this state, the slider 16 is self-locked with the fixed shaft 10 in the rotation direction by the screw thread and is in a static state; the sliding block 16 cannot slide relative to the fixed shaft 10; secondly, the sliding block 16 slides and rotates relative to the fixed shaft 10 under the action of centrifugal force, namely, the sliding block 16 and the fixed shaft 10 continue to rotate under the matching of threads while the fan blade 17 drives the fixed shaft 10 to rotate, after the fan blade 17 swings, a second guide block 32 arranged on a mounting disc 33 of the sliding block 16 just rotates to the position where the starting end and the tail end of a first guide groove 26 formed on a corresponding mounting sliding groove 22 are not contacted, and the sliding block 16 does not contact with the wall surface of one end of the mounting sliding groove 22 close to the axis of the rotor 12; thirdly, the sliding block 16 slides and rotates relative to the fixed shaft 10 under the action of centrifugal force, but the sliding block 16 rotates at a higher speed under the action of centrifugal force, before the fan blade 17 swings, the sliding block 16 touches the wall surface of the installation sliding groove 22 close to one end of the axis of the rotor 12, at this time, the second guide block 32 does not contact with the starting end and the tail end of the first guide groove 26 formed in the corresponding installation sliding groove 22, and then the fan blade 17 swings continuously and drives the sliding block 16 to swing continuously through the fixed shaft 10 until the fan blade 17 swings completely. In the third-middle movement mode of the sliding block 16, the fan can swing to a working state under the action of wind to normally work in any mode.

In the invention, if the first spring 14 in the control device 9 is damaged and loses the pulling force on the slider 16, then, when the fan is in a working state and the fan fails or is powered off, the undamaged first spring 14 can drive the corresponding fan blade 17 to swing flat, while the fan blade 17 corresponding to the damaged first spring 14 loses the reset function, and the fan blade 17 cannot swing and reset; under the condition that the undamaged first spring 14 drives the corresponding fan blade 17 to swing flat, the adjusting ring 7 moves downwards under the action of the return spring 8 because most of the upward pushing force of the fan blade 17 is lost, the adjusting ring 7 moves downwards to press the un-swung fan blade 17, so that the un-swung fan blade 17 swings flat, but because the first spring 14 corresponding to the fan blade 17 is damaged, the second spring 27 enables the corresponding sliding block 16 to be separated from the sliding sleeve 15, so that the fan blade 17 swings at a small angle relative to the original horizontal state, a corresponding small gap can be formed at the fan blade 17 of the combined fan blade 17, and the combined fan blade 17 is convenient to be blown up by wind, but the gap can not cause too large influence on the backflow of the wind relative to the complete opening of the fan blade 17.

The return spring 8 designed by the invention has two functions, firstly, in the process of opening the fan blades 17, the opening angles of the fan blades 17 are different due to different resistance generated by the long-time damage of the fan; in this state, the return spring 8 applies downward pressure to the adjusting ring 7, so that the opening angle difference of each fan blade 17 is reduced, and the function of basically synchronously adjusting the fan blades 17 is achieved; secondly, when the first spring 14 in the control device 9 loses its restoring function to the corresponding blade 17 due to a loss of use for a long time, the return spring 8 pushes down the adjusting ring 7, and the non-restored blade 17 is pushed by the adjusting ring 7 to be restored.

As shown in fig. 11, a stopper plate 18 for preventing the fixed shaft 10 from sliding out of the corresponding mounting slot 22 is mounted on all the fixed shafts 10 mounted on the rotor 12.

The lead angle of the external thread 28 on the fixed shaft 10 is 60 °; the thread lead angle of the internal thread 36 on the sliding sleeve 15 is 60 degrees.

In the above-described case where neither the first spring 14 nor the second spring 27 is damaged, the sliding disk 34 of the slider 16 is always located inside the sliding sleeve 15.

The driving motor 5 is detachably mounted on the stand 4.

A plurality of avoiding gaps 23 for preventing the fan blades 17 from interfering with the outer circumferential surface of the rotor 12 in the swinging process are uniformly formed on the outer circumferential surface of the rotor 12 in the circumferential direction.

The fixed shaft 10 is detachably connected with the corresponding fan blades 17.

The fixed shaft 10 is connected with the corresponding round opening 24 through a bearing; the fan blades 17 can be cleaned regularly.

The spring mounting plate 6 is fixedly mounted on the end face of the rotor 12 far away from the driving motor 5 in a welding mode.

The specific working process is as follows: when the fan designed by the invention is used, in a normal state, when the fan is used, the rotor 12 is controlled to rotate by the driving motor 5, the rotor 12 can enable the sliding sleeve 15 and the sliding block 16 which are installed on the rotor 12 to slide towards one side close to the outer circular surface of the rotor 12 under the action of centrifugal force, because the sliding sleeve 15 is installed in the corresponding installation sliding chute 22 through the sliding fit of the two first guide blocks 31 and the two third guide grooves 37, the sliding block 16 is installed on the sliding sleeve 15 through the sliding fit of the two third guide blocks 35 on the sliding disc 34 and the two second guide grooves 30 which are opened on the sliding sleeve 15, and under the action of the pulling force of the first spring 14 and the pressure of the second spring 27, the sliding block 16 and the sliding sleeve 15 keep a relative static state, at the moment, when the sliding block 16 slides, the sliding block 16 can drive the fixed shaft 10 which is connected with the sliding sleeve through thread fit under the action of threads to rotate, the, then rotating to dissipate heat of the computer; when the fan fails or is powered off, the rotor 12 stops rotating, the sliding block 16 and the sliding sleeve 15 lose centrifugal force, at the moment, the sliding block 16 and the sliding sleeve 15 can reversely reset and slide under the action of the first spring 14, the sliding block 16 drives the fixed shaft 10 to rotate in the sliding process, the fixed shaft 10 rotates to drive the fan blades 17 to reversely swing and reset, the fan blades are combined to shield an air opening of the fan to a certain degree, and the fan can be prevented from generating airflow backflow at the position of the failed fan, so that airflow disorder is caused, and the heat dissipation of a system is influenced; meanwhile, the dust can be prevented from floating into the inner side of the fan after the fan breaks down to a certain extent. When the first spring 14 in the control device 9 is damaged after long-term use, and the fan starts to work, the fan blade 17 corresponding to the damaged first spring 14 is continuously opened under the blowing of wind, and the fan continues to work; when the fan fails or is powered off, the undamaged first spring 14 can drive the corresponding fan blade 17 to swing flat, the fan blade 17 corresponding to the damaged first spring 14 loses the reset function, and the fan blade 17 cannot swing to reset; in this case, the adjusting ring 7 moves downward under the action of the return spring 8 because most of the upward pushing force of the fan blades 17 is lost, the adjusting ring 7 moves downward to press the fan blades 17 which are not swung, so that the fan blades 17 which are not swung are swung flat, but the corresponding sliders 16 are separated from the sliding sleeves 15 due to the fact that the first springs 14 corresponding to the fan blades 17 are damaged, so that the fan blades 17 swing at a small angle relative to the original horizontal state, and therefore corresponding small gaps can appear at the fan blades 17 of the combined fan blades 17, but the gaps do not have too large influence on the backflow of wind relative to the fact that the fan blades 17 are completely opened; the fan blades 17 of the fan are sealed to a certain degree, and the air port of the fan is shielded to a certain degree through the sealed fan, so that the situation that air flow backflow is generated at the fault fan, and the air flow is disordered to influence the heat dissipation of a system is prevented; meanwhile, the dust can be prevented from floating into the inner side of the fan after the fan breaks down to a certain extent.