CN112922860A

CN112922860A - Centrifugal fan

Info

Publication number: CN112922860A
Application number: CN202110210622.7A
Authority: CN
Inventors: 梁文锋; 干宏伟
Original assignee: Shaoxing Shangyu Yucai Fan Manufacturing Co ltd
Current assignee: Shaoxing Shangyu Yucai Fan Manufacturing Co ltd
Priority date: 2021-02-25
Filing date: 2021-02-25
Publication date: 2021-06-08

Abstract

The invention relates to the technical field of fans, in particular to a centrifugal fan which comprises a device body, wherein the device body comprises a base, one end of the base is fixedly provided with a supporting frame, one end of the supporting frame is fixedly provided with a fixing box, and a motor is fixedly arranged in the fixing box. According to the fan blade reversing limiting device, the first fixing frame, the first connecting block, the first spring, the first supporting rod, the second connecting block, the limiting block, the fixing plate, the third connecting block, the second supporting rod, the first connecting rod, the limiting plate, the limiting rod and the ratchet wheel are arranged, when a fan blade reverses, the ratchet wheel can be hooked to pull the fan blade on the limiting plate, when the limiting plate is pulled, the first supporting rod is driven to move through the second supporting rod, after the first supporting rod moves to be abutted against the limiting block, the ratchet wheel is blocked, the fan blade is limited, the problem that the fan blade reverses is solved, the damage of a motor is reduced, and the reliability of the fan blade reversing limiting device is improved.

Description

Centrifugal fan

Technical Field

The invention relates to the technical field of fans, in particular to a centrifugal fan.

Background

The fans are machines which increase the pressure of gas and discharge gas by means of input mechanical energy, and include various axial fans, centrifugal fans and the like, and the centrifugal fans are widely used for ventilation, dust exhaust and cooling of factories, mines, tunnels, cooling towers, vehicles, ships and buildings, and ventilation and air induction of boilers and industrial furnaces.

At present, most centrifugal fans convey airflow through positive rotation, but in the running process, because a mechanism for limiting the rotation direction of the centrifugal fan is lacked, the centrifugal fan is easy to rotate reversely, the inside of the centrifugal fan is damaged in the reverse rotation process, and the normal use of the centrifugal fan is influenced, for example, the centrifugal fan with the reverse rotation prevention mechanism disclosed in CN201811160684.6 drives a rotating shaft to rotate when a fan blade works normally, and further drives a ratchet wheel to rotate, the ratchet wheel can continuously lift up and then descend a non-return pawl, and further drives a pressure plate to continuously lift up and descend, so that a striking rod continuously strikes a bell, the bell can continuously make a sound to indicate that the fan blade works normally, when the fan blade rotates reversely, the ratchet wheel can rotate reversely, and at the time, the non-return pawl can block the ratchet wheel to avoid the reverse rotation of the ratchet wheel, and then avoided beating the pole and shake from top to bottom, and then the small bell can stop sounding, just at this moment is reminding staff that the fan leaf has appeared reversing, and centrifugal fan has stopped working, has avoided centrifugal fan reversal to lead to the machine to damage, still has the problem that clamp plate and beating the pole and appear wearing and tearing fracture.

Therefore, it is desirable to design a centrifugal fan to solve the above problems.

Disclosure of Invention

The present invention aims to provide a centrifugal fan, so as to solve the problems that most of the existing centrifugal fans proposed in the background art convey airflow by forward rotation, but in the operation process, because a mechanism for limiting the rotation direction of the centrifugal fan is absent, the centrifugal fan is easy to reverse rotation, and the inside of the centrifugal fan is damaged by the reverse rotation process, so that the normal use of the centrifugal fan is affected.

In order to achieve the purpose, the invention provides the following technical scheme: a centrifugal fan comprises a device body, wherein the device body comprises a base, one end of the base is fixedly provided with a support frame, one end of the support frame is fixedly provided with a fixed box, the inside of the fixed box is fixedly provided with a motor, one end of the motor extends to the outer side of the fixed box, one side of the fixed box at one end of the support frame is fixedly provided with a transmission shaft, one end of the transmission shaft is fixedly connected with one end of the motor, one end of the base is fixedly provided with a spiral case, the inside of the spiral case is movably provided with a fan blade, one end of the fan blade extends to the outer side of the spiral case and is fixedly connected with one end of the transmission shaft, one end of the base is fixedly provided with a control panel, one end of the spiral case is provided with an anti-reversion mechanism, the anti-reversion mechanism comprises a fixed frame, one end of the spiral case is fixedly provided with a fixed frame, and, a first spring is fixedly arranged in the first connecting block, one end of the first spring is fixedly connected with a first supporting rod, one end of the first fixing frame, which is far away from the first connecting block, is fixedly provided with a second connecting block, the inside of the second connecting block is fixedly provided with a limiting block, one end of the first supporting rod extends into the second connecting block, the bottom end of the first supporting rod is fixedly provided with a supporting wheel, the inside of the first fixing frame is fixedly provided with a fixed plate, one end of the fixed plate is provided with a groove, one end of the supporting wheel extends and slides in the groove, the bottom end of the fixed plate is fixedly provided with a third connecting block, the inside of the third connecting block is movably provided with a second supporting rod, one end of the second supporting rod extends into the spiral case, and the front of the second supporting rod is movably provided with a first connecting rod, and the one end that No. two bracing pieces were kept away from to a connecting rod and the positive swing joint of bracing piece No. one, the one end of No. two bracing pieces has the limiting plate through pivot movable mounting, and the one end of limiting plate is the arc, the positive fixed mounting of No. two bracing pieces has the gag lever post, and the one end of gag lever post and the positive counterbalance of limiting plate close, the fixed cover of one end of fan leaf has connect the ratchet, the one end of limiting plate is laminated with the one end of ratchet mutually.

Preferably, the bottom of base is provided with damper, damper includes fixed box, the both sides fixed mounting of base bottom has fixed box, and the quantity of every side fixed box all is four, the inside all fixed mounting of fixed box has No. two springs, No. two equal fixedly connected with No. three bracing pieces in the one end of spring, and the one end of No. three bracing pieces all extends to the outside of fixed box, the one end all swing joint of No. two connecting rods of No. three bracing pieces, the one end all swing joint of No. two connecting rods has the cushion socket.

Preferably, the front of fixed case is provided with protection machanism, protection machanism includes the hinge, the positive fixed mounting of fixed case has the hinge, and the quantity of hinge is two, the one end all activity hinges of hinge has the guard plate, the positive fixed mounting of guard plate has a magnetic path, and the quantity of a magnetic path is two, the positive fixed mounting of fixed case has No. two magnetic paths, and the quantity of No. two magnetic paths is two, the one end of a magnetic path and the one end of No. two magnetic paths adsorb each other.

Preferably, the one end of fixed case is provided with heat dissipation mechanism, heat dissipation mechanism includes the cavity No. one, the cavity No. one has evenly been seted up to the one end of fixed case, the inside all fixed mounting of cavity has the fixed block, the one end movable mounting of fixed block has the kelly, and the quantity of kelly is two, two fixedly connected with No. four springs between the kelly, the one end swing joint of kelly has the mount No. two, the inside fixed mounting of mount No. two has radiator fan, and radiator fan's one end laminating is in the one end of fixed case.

Preferably, the one end of a mount is provided with warning mechanism, warning mechanism includes No. three mounts, the one end fixed mounting of a mount has No. three mounts, the one end fixed mounting of No. three mounts has the singlechip box body, the inside of singlechip box body is provided with the singlechip main part, the top fixed mounting of singlechip box body has the siren, the bottom fixed mounting of singlechip box body has pressure sensor, and pressure sensor's one end extends to the inboard of singlechip box body, the even fixed mounting in one end of singlechip box body has the link, the inside all movable mounting of link has an extrusion piece No. one, the one end fixed mounting of a bracing piece has No. two extrusion pieces, the one end of an extrusion piece and No. two extrusion pieces all is the arc.

Preferably, the inside of fixed box all is provided with slide mechanism, slide mechanism includes the slide rail, the inside all fixed mounting of fixed box has the slide rail, the spout has all been seted up to the one end of slide rail, the inside all movable mounting of spout has the slider, and the one end of slider and the one end fixed connection of No. three bracing pieces.

Preferably, the both sides of cushion socket one end are all fixed mounting have the dead lever, the bottom of base is all even fixed mounting have spacing, and the one end of spacing all activity cup joints the one end at the dead lever, the inside of spacing all fixed mounting have No. three springs, and the one end of No. three springs all is connected with the one end of dead lever.

Preferably, No. two cavities have all been seted up to the one end of slider, No. two inside movable mounting of cavity have the ball all, and the one end of ball all laminates with the inner wall of No. two springs mutually.

Compared with the prior art, the invention has the beneficial effects that:

1. through being provided with the mount No. one, a connecting block, a spring, a bracing piece, No. two connecting blocks, the stopper, the supporting wheel, the fixed plate, a groove, No. three connecting blocks, No. two bracing pieces, a connecting rod, the limiting plate, gag lever post and ratchet, when the fan leaf reverses, the ratchet then can the barb stimulate it on the limiting plate, then can drive a bracing piece through No. two bracing pieces and remove when the limiting plate is promoted, a bracing piece removes and supports the back of closing with the stopper, blockking the ratchet, and then spacing fan leaf has been carried out, the condition that the fan leaf reverses has been solved and has been produced, the condition that the motor damaged appears in the reduction, the reliability of this device has been promoted.

2. Through being provided with cavity, fixed block, kelly, No. four springs, No. two mounts and radiator fan, vent department in fixed bottom of the case portion sets up radiator fan, can solve the motor heat dissipation problem, and the help motor carries out quick cooling, makes its stable operation, has promoted the reliability of this device.

3. Through being provided with No. three mounts, the singlechip box body, the singlechip main part, the siren, pressure sensor, the link, extrusion piece and No. two extrusion pieces, drive extrusion piece and extrude the piece No. one after a bracing piece aversion, make extrusion piece touch pressure sensor No. one, thereby make the singlechip main part receive the signal control siren and start, can play the effect of reminding to the staff, make that the staff can be timely operate the motor and close, and then prevent that the motor from continuously operating and causing and the condition of internal damage from taking place, the security of this device has been promoted.

Drawings

FIG. 1 is a schematic sectional elevation view of the structure of the present invention;

FIG. 2 is a schematic front view of the structure of the present invention;

FIG. 3 is a schematic side view of the structure of the present invention;

FIG. 4 is a partially enlarged schematic view of the structure of the anti-reverse mechanism of the present invention;

FIG. 5 is a partial side view of the anti-wind-back mechanism of the present invention;

FIG. 6 is a partially enlarged view of the structure of the damper mechanism and the slide mechanism of the present invention;

FIG. 7 is an enlarged view of a portion of the structure at A in FIG. 1 according to the present invention;

FIG. 8 is an enlarged view of a portion of the structure shown at B in FIG. 4 according to the present invention;

fig. 9 is an enlarged view of a portion of the structure at C in fig. 6 according to the present invention.

In the figure: 100. a device body; 110. a base; 111. a support frame; 112. a fixed box; 113. a motor; 114. a drive shaft; 115. a screw box; 116. a fan blade; 117. a control panel; 200. a reverse rotation prevention mechanism; 210. a first fixing frame; 211. a first connecting block; 212. a first spring; 213. a first support rod; 214. a second connecting block; 215. a limiting block; 216. a support wheel; 217. a fixing plate; 218. a groove; 219. a third connecting block; 220. a second support rod; 221. a first connecting rod; 222. a limiting plate; 223. a limiting rod; 224. a ratchet wheel; 300. a damping mechanism; 310. a fixing box; 311. a second spring; 312. a third support rod; 313. a second connecting rod; 314. a shock absorbing seat; 315. fixing the rod; 316. a limiting frame; 317. a third spring; 400. a protection mechanism; 410. a hinge; 411. a protection plate; 412. a first magnetic block; 413. a second magnetic block; 500. a heat dissipation mechanism; 510. a first cavity; 511. a fixed block; 512. a clamping rod; 513. a fourth spring; 514. a second fixing frame; 515. a heat radiation fan; 600. a warning mechanism; 610. a third fixing frame; 611. a single chip microcomputer box body; 612. a singlechip main body; 613. an alarm; 614. a pressure sensor; 615. a connecting frame; 616. a first extrusion block; 617. a second extrusion block; 700. a sliding mechanism; 710. a slide rail; 711. a chute; 712. a slider; 713. a cavity II; 714. and a ball.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-9, an embodiment of the present invention is shown:

a centrifugal fan comprises a device body 100, wherein a fixed box 112, a cooling fan 515, a singlechip main body 612, an alarm 613 and a pressure sensor 614 which are used in the centrifugal fan are all products which can be directly purchased in the market, the principle and the connection mode of the centrifugal fan are the prior art which are well known to those skilled in the art, and therefore the description is omitted, the device body 100 comprises a base 110, one end of the base 110 is fixedly provided with a support frame 111, one end of the support frame 111 is fixedly provided with the fixed box 112, the inside of the fixed box 112 is fixedly provided with a motor 113, one end of the motor 113 extends to the outer side of the fixed box 112, one side of one end of the support frame 111 is fixedly provided with a transmission shaft 114, one end of the transmission shaft 114 is fixedly connected with one end of the motor 113, one end of the base 110 is fixedly provided with a screw box 115, the inside of the screw box 115 is movably provided with a fan blade 116, one end of the fan blade 116, a control panel 117 is fixedly installed at one end of the base 110, an output end of the control panel 117 is respectively electrically connected with an input end of the fixed box 112, an input end of the cooling fan 515 and an input end of the single chip microcomputer main body 612, an anti-reversion mechanism 200 is arranged at one end of the spiral case 115, the anti-reversion mechanism 200 comprises a first fixed frame 210, the first fixed frame 210 is fixedly installed at one end of the spiral case 115, the first connecting block 211 is fixedly installed inside the first fixed frame 210, the first spring 212 is fixedly installed inside the first connecting block 211, the first support rod 213 is fixedly connected at one end of the first spring 212, the second connecting block 214 is fixedly installed at one end of the first fixed frame 210 far away from the first connecting block 211, the limiting block 215 is fixedly installed inside the second connecting block 214, one end of the first support rod 213 extends to the inside of the second connecting block 214, and a support wheel 216, a fixing plate 217 is fixedly arranged inside the first fixing frame 210, a groove 218 is formed at one end of the fixing plate 217, one end of a supporting wheel 216 extends and slides inside the groove 218, a third connecting block 219 is fixedly arranged at the bottom end of the fixing plate 217, a second supporting rod 220 is movably arranged inside the third connecting block 219, one end of the second supporting rod 220 extends to the inside of the screw box 115, a first connecting rod 221 is movably arranged on the front surface of the second supporting rod 220, one end of the first connecting rod 221, which is far away from the second supporting rod 220, is movably connected with the front surface of the first supporting rod 213, a limiting plate 222 is movably arranged at one end of the second supporting rod 220 through a rotating shaft, one end of the limiting plate 222 is arc-shaped, a limiting rod 223 is fixedly arranged on the front surface of the second supporting rod 220, one end of the limiting rod 223 abuts against the front surface of the limiting plate 222, a ratchet wheel 224 is fixedly sleeved at one end of, when fan leaf 116 reverses, ratchet 224 can then barb and stimulate it on limiting plate 222, then can drive a bracing piece 213 through No. two bracing pieces 220 when limiting plate 222 is promoted and remove, a bracing piece 213 removes and closes with stopper 215 is to the back, has blockked ratchet 224, and then has carried out spacingly to fan leaf 116, has solved the condition that fan leaf 116 reverses and has produced reversing, reduces the condition that motor 113 appears damaging, has promoted the reliability of this device.

Further, the bottom of base 110 is provided with damper 300, damper 300 includes fixed box 310, the both sides fixed mounting of base 110 bottom has fixed box 310, and the quantity of the fixed box 310 of every side all is four, the inside all fixed mounting of fixed box 310 has No. two springs 311, No. three bracing pieces 312 of the all fixedly connected with of one end of No. two springs 311, and the one end of No. three bracing pieces 312 all extends to the outside of fixed box 310, the all swing joint of one end of No. three bracing pieces 312 has No. two connecting rods 313, the all swing joint of one end of No. two connecting rods 313 has cushion socket 314, set up damper 300 in the bottom and can play the absorbing effect of buffering when motor 113 and fan blade 116 move, alleviate the range of rocking of motor 113 and fan blade 116, the damage that vibrations led to the fact motor 113 and fan blade 116 has been solved, the reliability of this device has been promoted.

Further, the front of fixed box 112 is provided with protection machanism 400, protection machanism 400 includes hinge 410, the front fixed mounting of fixed box 112 has hinge 410, and the quantity of hinge 410 is two, the one end all activity hinges of hinge 410 has guard plate 411, the front fixed mounting of guard plate 411 has a magnetic path 412, and the quantity of a magnetic path 412 is two, the front fixed mounting of fixed box 112 has No. two magnetic paths 413, and the quantity of No. two magnetic paths 413 is two, the one end of a magnetic path 412 and the one end of No. two magnetic paths 413 adsorb each other, it seals fixed box 112 to set up guard plate 411, thereby play the effect of protection to its inside motor 113, prevent that motor 113 from receiving external destruction, it causes the condition emergence of damage to have solved motor 113, the security of this device has been promoted.

Further, the one end of fixed case 112 is provided with heat dissipation mechanism 500, heat dissipation mechanism 500 includes cavity 510, cavity 510 has evenly been seted up to fixed case 112's one end, the inside all fixed mounting of cavity 510 has fixed block 511, the one end movable mounting of fixed block 511 has kelly 512, and the quantity of kelly 512 is two, fixedly connected with four number springs 513 between two kellies 512, the one end movable connection of kelly 512 has mount 514 No. two, the inside fixed mounting of mount 514 has radiator fan 515, and radiator fan 515's one end laminating is in the one end of fixed case 112, vent department in fixed case 112 bottom sets up radiator fan 515, can solve motor 113 heat dissipation problem, help motor 113 to carry out quick cooling, make its stable operation, the reliability of this device has been promoted.

Further, an alarming mechanism 600 is arranged at one end of the first fixing frame 210, the alarming mechanism 600 comprises a third fixing frame 610, the third fixing frame 610 is fixedly installed at one end of the first fixing frame 210, a single-chip microcomputer box body 611 is fixedly installed at one end of the third fixing frame 610, a single-chip microcomputer main body 612 is arranged inside the single-chip microcomputer box body 611, an alarm 613 is fixedly installed at the top end of the single-chip microcomputer box body 611, a pressure sensor 614 is fixedly installed at the bottom end of the single-chip microcomputer box body 611, one end of the pressure sensor 614 extends to the inner side of the single-chip microcomputer box body 611, a connecting frame 615 is uniformly and fixedly installed at one end of the single-chip microcomputer box body 611, a first extruding block 616 is movably installed inside the connecting frame 615, a second extruding block 617 is fixedly installed at one end of the first supporting rod 213, one ends of the first extruding block 616 and the second extruding block 617 are both arc-shaped, make an extrusion piece 616 touch pressure sensor 614 to make singlechip main part 612 receive signal control siren 613 and start, can play the effect of reminding to the staff, make that the staff can be timely operate motor 113 and close, and then prevent that motor 113 continuous operation from causing and the condition of internal damage from taking place, promoted the security of this device.

Further, fixed box 310's inside all is provided with slide mechanism 700, slide mechanism 700 includes slide rail 710, fixed box 310's inside all fixed mounting has slide rail 710, slide rail 710's one end has all been seted up spout 711, the inside all movable mounting of spout 711 has slider 712, and slider 712's one end and No. three one end fixed connection of bracing piece 312, slider 712 connects No. three bracing piece 312 and slides in No. two spring 311's inside, the effect of support has been played No. three bracing piece 312, thereby play stable effect to No. two spring 311, the condition production that appears the skew when having solved vibrations, prevent the cracked condition of skew, the reliability of this device has been promoted.

Further, the both sides of cushion socket 314 one end are fixed mounting all has dead lever 315, the bottom of base 110 is all even fixed mounting has spacing 316, and the one end of spacing 316 is all the activity cup jointed in the one end of dead lever 315, the inside of spacing 316 is all fixed mounting has No. three spring 317, and No. three spring 317's one end is all connected with the one end of dead lever 315, dead lever 315 activity cup joints the inside at spacing 316, can play stable effect to No. two connecting rod 313 and cushion socket 314, skew about taking place when preventing the shock attenuation, the amplitude that further reduction rocked, certain shock attenuation effect has been increased, the reliability of this device has been promoted.

Furthermore, No. two cavities 713 have all been seted up to the one end of slider 712, and No. two cavities 713's inside all movable mounting has ball 714, and ball 714's one end all laminates mutually with the inner wall of No. two springs 311, sets up ball 714 and rolls in the one end of slider 712, has solved the wearing and tearing that produce when slider 712 slides to increased slider 712's life, made slider 712 can be permanent use, promoted this device's reliability.

The working principle is as follows: when fan leaf 116 moves, because limiting plate 222 passes through pivot swing joint, so can not spacing ratchet 224, when fan leaf 116 takes place to overturn, because limiting plate 222 openly has spacing pole 223 to support to close, so ratchet 224 can the joint on limiting plate 222, thereby drive limiting plate 222 and remove, can stimulate No. two bracing pieces 220 downstream when limiting plate 222 removes, No. two bracing pieces 220 then can drive a bracing piece 213 through a connecting rod 221 and remove, after a bracing piece 213 removed and stopper 215 supported each other, then can carry out spacing fixed to limiting plate 222, thereby spacing ratchet 224 has been carried out, make fan leaf 116 stop the reversal.

When the first supporting rod 213 moves, the second extruding block 617 moves along with the first supporting rod 213, the second extruding block 617 extrudes the first extruding block 616, the first extruding block 616 slides upwards along the connecting frame 615 to extrude the pressure sensor 614, the pressure sensor 614 extrudes the first extruding block 616, and then transmits a signal to the single chip microcomputer main body 612, the single chip microcomputer main body 612 controls the alarm 613 to start an alarm, so that a worker is reminded to close the motor 113, and the reverse rotation is prevented from being damaged.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

1. A centrifugal fan comprising a device body (100), characterized in that: the device body (100) comprises a base (110), a support frame (111) is fixedly mounted at one end of the base (110), a fixed box (112) is fixedly mounted at one end of the support frame (111), a motor (113) is fixedly mounted inside the fixed box (112), one end of the motor (113) extends to the outside of the fixed box (112), a transmission shaft (114) is fixedly mounted at one side of the fixed box (112) at one end of the support frame (111), one end of the transmission shaft (114) is fixedly connected with one end of the motor (113), a spiral case (115) is fixedly mounted at one end of the base (110), a fan blade (116) is movably mounted inside the spiral case (115), one end of the fan blade (116) extends to the outside of the spiral case (115) and is fixedly connected with one end of the transmission shaft (114), and a control panel (117) is fixedly mounted at one end of the base (110), the one end of spiral shell box (115) is provided with prevents reverse mechanism (200), prevent reverse mechanism (200) and include mount (210) No. one, the one end fixed mounting of spiral shell box (115) has mount (210) No. one, the inside fixed mounting of mount (210) has connecting block (211) No. one, the inside fixed mounting of connecting block (211) has spring (212) No. one, the one end fixed connection of spring (212) has bracing piece (213) No. one, the one end fixed mounting that connecting block (211) was kept away from to mount (210) has connecting block (214) No. two, the inside fixed mounting of connecting block (214) No. two has stopper (215), the one end of bracing piece (213) extends to the inside of connecting block (214) No. two, the bottom fixed mounting of bracing piece (213) has supporting wheel (216), the inside fixed mounting of No. one mount (210) has fixed plate (217), recess (218) are seted up to the one end of fixed plate (217), the one end of supporting wheel (216) extends to slide in the inside of recess (218), the bottom fixed mounting of fixed plate (217) has No. three connecting block (219), the inside movable mounting of No. three connecting block (219) has No. two bracing pieces (220), and the one end of No. two bracing pieces (220) extends to the inside of spiral case (115), the positive movable mounting of No. two bracing pieces (220) has connecting rod (221), and the one end that No. two bracing pieces (220) were kept away from to connecting rod (221) and the positive swing joint of bracing piece (213), the one end of No. two bracing pieces (220) has limiting plate (222) through pivot movable mounting, and the one end of limiting plate (222) is the arc, the positive fixed mounting of No. two bracing pieces (220) has limiting rod (223), and one end of the limiting rod (223) is abutted against the front surface of the limiting plate (222), one end of the fan blade (116) is fixedly sleeved with a ratchet wheel (224), and one end of the limiting plate (222) is attached to one end of the ratchet wheel (224).

2. The centrifugal fan according to claim 1, wherein: the bottom of base (110) is provided with damper (300), damper (300) are including fixed box (310), the both sides fixed mounting of base (110) bottom has fixed box (310), and the quantity of the fixed box (310) of every side all is four, the inside all fixed mounting of fixed box (310) has No. two springs (311), No. three bracing pieces (312) of all fixedly connected with in the one end of No. two springs (311), and the one end of No. three bracing pieces (312) all extends to the outside of fixed box (310), No. two connecting rods (313) of all swing joint in the one end of No. three bracing pieces (312), the one end all swing joint of No. two connecting rods (313) has cushion (314).

3. The centrifugal fan according to claim 1, wherein: the front of fixed case (112) is provided with protection machanism (400), protection machanism (400) are including hinge (410), the positive fixed mounting of fixed case (112) has hinge (410), and the quantity of hinge (410) is two, the all movable hinges of one end of hinge (410) have guard plate (411), the positive fixed mounting of guard plate (411) has magnetic block (412) No. one, and the quantity of magnetic block (412) is two, the positive fixed mounting of fixed case (112) has magnetic block (413) No. two, and the quantity of magnetic block (413) No. two, the one end of magnetic block (412) and the one end mutual adsorption of magnetic block (413) No. two.

4. The centrifugal fan according to claim 1, wherein: the one end of fixed case (112) is provided with heat dissipation mechanism (500), heat dissipation mechanism (500) includes cavity (510) No. one, cavity (510) have evenly been seted up to the one end of fixed case (112), the inside all fixed mounting of cavity (510) has fixed block (511), the one end movable mounting of fixed block (511) has kelly (512), and the quantity of kelly (512) is two, two fixedly connected with four number spring (513) between kelly (512), the one end swing joint of kelly (512) has No. two mount (514), the inside fixed mounting of No. two mount (514) has radiator fan (515), and the one end laminating of radiator fan (515) is in the one end of fixed case (112).

5. The centrifugal fan according to claim 1, wherein: one end of the first fixing frame (210) is provided with a warning mechanism (600), the warning mechanism (600) comprises a third fixing frame (610), the third fixing frame (610) is fixedly installed at one end of the first fixing frame (210), a single chip microcomputer box body (611) is fixedly installed at one end of the third fixing frame (610), a single chip microcomputer main body (612) is arranged inside the single chip microcomputer box body (611), an alarm (613) is fixedly installed at the top end of the single chip microcomputer box body (611), a pressure sensor (614) is fixedly installed at the bottom end of the single chip microcomputer box body (611), one end of the pressure sensor (614) extends to the inner side of the single chip microcomputer box body (611), a connecting frame (615) is uniformly and fixedly installed at one end of the single chip microcomputer box body (611), a first extruding block (616) is movably installed inside the connecting frame (615), and a second extruding block (617) is fixedly installed at one end of the first supporting, one end of the first extrusion block (616) and one end of the second extrusion block (617) are both arc-shaped.

6. A centrifugal fan according to claim 2, wherein: the inside of fixed box (310) all is provided with slide mechanism (700), slide mechanism (700) includes slide rail (710), the inside all fixed mounting of fixed box (310) has slide rail (710), spout (711) have all been seted up to the one end of slide rail (710), the inside all movable mounting of spout (711) has slider (712), and the one end of slider (712) and the one end fixed connection of No. three bracing pieces (312).

7. A centrifugal fan according to claim 2, wherein: the utility model discloses a damping mount, including shock attenuation seat (314), base (110), spacing frame (316), the one end of spacing frame (316) is all movably connected in the one end of dead lever (315), the inside of spacing frame (316) is all fixedly connected with No. three spring (317), and the one end of No. three spring (317) all is connected with the one end of dead lever (315).

8. The centrifugal fan according to claim 6, wherein: no. two cavities (713) are all seted up to the one end of slider (712), the inside of No. two cavities (713) all movable mounting have ball (714), and the one end of ball (714) all laminates with the inner wall of No. two spring (311).