CN220667883U - Linkage adjustment mechanism and petal type air damper - Google Patents

Abstract

The utility model provides a linkage adjusting mechanism which comprises a plurality of rotating units and straight rods, wherein each rotating unit comprises a bearing seat arranged on a cylinder body, a rotating shaft matched with the bearing seat and a rotating arm connected to one end of the rotating shaft, the other end of the rotating shaft penetrates through the cylinder body to be connected with a blade, the rotating arm is a strip-shaped plate bent into five sections along four bending lines, each rotating arm comprises a middle section connected with the rotating shaft, two connecting sections positioned at two ends and two transition sections connected with the middle section and the connecting sections, the middle section and the connecting sections at two sides of the transition sections are respectively folded in opposite directions, the two bending lines separating the middle section and the transition sections are mutually parallel, the two bending lines separating the transition sections and the connecting sections are mutually parallel, and the two connecting sections on each rotating arm are respectively connected with the connecting sections at the same side on the adjacent rotating arm through the straight rods. The petal type air damper comprises a cylinder body, an odd number of fan-shaped blades arranged in the cylinder body and a linkage adjusting mechanism, and is low in assembly difficulty, easy to process, few in casting use and lower in manufacturing cost.

Description

Linkage adjustment mechanism and petal type air damper

Technical Field

The utility model relates to the field of fans, in particular to a linkage adjusting mechanism and a petal type air damper.

Background

The fan is mainly used for occasions such as a boiler combustion system, a drying system, a cooling system, a ventilation system and the like. The air damper is used as a common accessory of the fan, has the function of adjusting the air quantity, is generally axially arranged in front of the air inlet, and has the adjusting range of 0-90 degrees. When the fan is started, in order to avoid overload of the motor current equipped with the fan, the air damper is required to be closed, and the air damper is gradually opened after the air damper is stabilized.

The petal type air damper is a common fan air damper type and generally comprises an outer cylinder, fan-shaped blades arranged in the outer cylinder and a rotating mechanism for driving the blades to rotate. For example: the Chinese patent publication No. CN 214199951U discloses a fan damper, wherein the rotating mechanism consists of a plurality of rotating arm assemblies which are arranged around the annular outer side wall of the damper and are mutually linked, each rotating arm assembly comprises a shaft sleeve in the middle and rotating arms fixedly connected with two sides of the shaft sleeve, and the shaft sleeve is sleeved on the outer wall of a rotating shaft fixedly connected with a blade and is fastened by bolts and nuts. Two adjacent rotating arm assemblies are fixedly connected with two rotating arms on the same side through a connecting rod, so that the mutual linkage of the rotating arm assemblies is realized.

However, the rotating arm and the shaft sleeve are manufactured by adopting castings in actual production, so that the cost is high; the joint bearing for connecting the rotating arm and the connecting rod has a limited moving range, the straight-plate-shaped rotating arm makes the whole assembly of the rotating mechanism more difficult, and the connecting rod needs to be bent for a certain angle, so that the processing steps are complicated; the friction force between the shaft sleeve and the shaft can be reduced by lubricant such as grease, and the opening and closing resistance of the air door can be larger.

Disclosure of Invention

The present utility model has been made to solve the above-described problems, and an object of the present utility model is to provide a linkage adjustment mechanism and a petal damper which are inexpensive and easy to manufacture.

In order to achieve the above purpose, the present utility model provides the following technical solutions:

the utility model provides a linkage adjustment mechanism, sets up on the barrel of petal formula air damper, includes a plurality of rotary units and a plurality of straight-bars of connecting rotary unit of following barrel circumference equidistant arrangement, wherein: the rotary unit comprises a bearing seat arranged on the side wall of the cylinder body, a rotary shaft matched with the bearing seat and a rotary arm connected to one end of the rotary shaft, wherein the other end of the rotary shaft penetrates through the side wall of the cylinder body and is connected with blades of the air damper in a one-to-one correspondence manner, the rotary arm is a strip-shaped plate bent into five sections along four bending lines, the rotary arm comprises a middle section connected with the rotary shaft, two connecting sections positioned at two ends and two transition sections connected with the middle section and the connecting sections positioned at two ends, the middle section and the connecting sections positioned at two ends are respectively folded in opposite directions, the two bending lines separating the middle section and the transition sections are parallel to each other, the two connecting sections separating the transition sections and the connecting sections are connected with the connecting sections positioned at the same side on the adjacent rotary arm through straight rods.

Further, a through hole matched with the rotating shaft is formed in the middle section of the rotating arm, the rotating shaft penetrates through the through hole of the rotating arm and is fixed through welding, a threaded connection hole is further formed in the connecting section of the rotating arm, a ball head is mounted at the threaded connection hole, positive threads and negative threads are respectively arranged at the two ends of the straight rod, rod end joint bearings matched with the ball head are connected through threads, two locking nuts opposite in rotation direction are further mounted on the straight rod, and the two locking nuts are used for locking the two rod end joint bearings respectively.

Further, the rotary unit further comprises a bearing mounting plate welded on the outer side wall of the cylinder body, the bearing seat is connected to the bearing mounting plate through a plurality of bolts in a fastening mode, a rotating shaft mounting hole in clearance fit with the rotating shaft is formed in the middle of the bearing mounting plate, a gasket mounting groove is formed in the bottom of the bearing mounting plate, a rotating shaft connecting hole is formed in the side wall of the cylinder body, a cavity is formed jointly by the gasket mounting groove and the rotating shaft connecting hole, a positioning gasket consistent with the cavity is arranged in the cavity, a rotating shaft positioning hole matched with the rotating shaft is formed in the middle of the positioning gasket, and a spring retainer ring for the shaft is sleeved at the position, close to the positioning gasket, on the rotating shaft.

Further, the rotating unit further comprises a cylindrical shaft sleeve sleeved on the rotating shaft, the shaft sleeve is in clearance fit with the rotating shaft and is positioned between the bearing seat and the rotating arm for axial positioning.

Further, the rotating arms are divided into a forward rotating arm and a reverse rotating arm with opposite bending directions, and the forward rotating arm and the reverse rotating arm are alternately arranged at intervals in a plurality of rotating units surrounding the outer side wall of the cylinder body.

Further, one of the plurality of rotating units is a driving rotating unit, the other rotating units are driven rotating units, a rotating shaft in the driving rotating unit is a driving rotating shaft, a rotating shaft in the driven rotating unit is a driven rotating shaft, the length of the driving rotating shaft is larger than that of the driven rotating shaft, and a handle for driving the driving rotating shaft to rotate is arranged at one end of the driving rotating shaft, which is located outside the cylinder body.

Further, a bolt hole is formed in the handle, a fan-shaped angle limiting plate is further arranged on the outer side of the barrel, a plurality of positioning holes corresponding to the bolt holes are formed in the angle limiting plate at equal intervals along the circumferential direction, and the bolt hole is connected with one of the positioning holes through a bolt so as to lock the handle.

Further, in one of the driven rotary units adjacent to the driving rotary unit, a threaded hole is axially formed in one end of the driven rotary shaft, located outside the cylinder, and a pointer is mounted through a bolt, a sector-ring-shaped dial is further arranged outside the cylinder, and the pointer is matched with the dial and used for indicating the rotation angle of the blade.

A petal damper comprising: barrel, set up in the inside odd fan-shaped blade of barrel and foretell linkage adjustment mechanism.

Further, the inside core that is equipped with of barrel, this core include the core main part and connect core lower cover and the core blank cap at core main part both ends respectively, and the central line position fixedly connected with blade pivot of blade, blade pivot rotationally connect in the core main part, are connected with a plurality of strengthening ribs between core main part and the barrel inner wall, are equipped with rotatory spacing piece on one of them blade, and this rotatory spacing piece offsets with the strengthening rib when the blade rotates to 90.

The utility model has the following beneficial effects:

1. in the linkage adjusting mechanism and the petal type air damper, the rotating arm is a bent strip-shaped plate, and compared with the conventional straight plate-shaped rotating arm, the bent rotating arm has higher adaptation degree with the radian of the outer wall of the cylinder, has low assembly difficulty, is easy to process, reduces the use of castings, and reduces the manufacturing cost.

2. In the linkage adjusting mechanism and the petal type air damper, the rotating shaft is arranged on the cylinder body through the bearing seat, so that the opening and closing resistance of the air damper is smaller, the adjustment is convenient, the use of castings is reduced, and the manufacturing cost is reduced.

3. In the linkage adjusting mechanism and the petal type air damper, the straight rod is adopted to replace the bent connecting rod, so that the structure is simple, the processing steps are fewer, and the processing time and the processing cost can be saved.

Drawings

FIG. 1 is a schematic view of a petal damper in an embodiment of the present utility model;

FIG. 2 is a front view of a petal damper in an embodiment of the present utility model;

FIG. 3 is a top view of a petal damper in an embodiment of the present utility model;

FIG. 4 is a cross-sectional view of section A-A of FIG. 3;

FIG. 5 is an enlarged view of the structure within circle B of FIG. 4;

FIG. 6 is an enlarged view of the structure within circle C of FIG. 4;

FIG. 7 is a front view of a swivel arm in an embodiment of the utility model;

FIG. 8 is a top view of a swivel arm in an embodiment of the utility model;

FIG. 9 is a cross-sectional view of section D-D of FIG. 8;

FIG. 10 is a cross-sectional view of section E-E of FIG. 8;

fig. 11 is an expanded view of the forward rotating arm and the reverse rotating arm in the embodiment of the present utility model.

Reference numerals:

the device comprises a 10-cylinder body, a 11-core body, a 12-core lower cover, a 13-core blank cap, a 14-reinforcing rib, a 15-rotating shaft connecting hole, a 20-blade, a 21-blade rotating shaft, a 22-rotating limiting piece, a 30-linkage adjusting mechanism, a 31-straight rod, a 32-bearing seat, a 321-first bolt, a 33-rotating shaft, a 33 a-driving rotating shaft, a 33 b-driven rotating shaft, a 34-rotating arm, a 34 a-forward rotating arm, a 34 b-reverse rotating arm, a 341-middle section, a 342-connecting section, a 343-transition section, a 344-through hole, a 345-threaded connecting hole, a 351-ball head, a 352-rod end joint bearing, 353-locking nut, a 36-bearing mounting plate, 361-rotating shaft mounting hole, a 362-lining mounting groove, a 37-locating lining, a 371-rotating shaft locating hole, a 38-shaft spring retainer ring, a 39-sleeve, a 41-handle, a 411-tubular extension piece, a 412-flat key, a 413-plug pin hole, a 414-operating hole, a 42-angle limiting plate, a 421-locating hole, a 43-second bolt, a 44-pointer and 45-pointer.

Detailed Description

In order to make the technical means, creation characteristics, achievement purposes and effects of the utility model easy to understand, the following embodiments specifically describe the linkage adjusting mechanism and the petal type air damper according to the utility model with reference to the accompanying drawings.

< example >

As shown in fig. 1 to 3, in the present embodiment, the petal damper includes a cylinder 10, an odd number of fan blades 20 provided inside the cylinder 10, and a linkage adjustment mechanism 30.

The cylinder 10 has a cylindrical structure, and a core is provided inside, as shown in fig. 4, and includes a core main body 11, and a core lower cover 12 and a core cover 13 respectively connected to both ends of the core main body 11. The core body 11 is cylindrical, the core blank cap 13 is spherical shell, and the core blank cap 13 in the embodiment is formed by pressing a compression mold, so that the traditional turning is replaced, and the processing and material cost is reduced.

The blades 20 are fan-shaped plates with the same size, a blade rotating shaft 21 is fixedly connected to the center line of the blades 20, and the blade rotating shaft 21 is rotatably connected to the core body 11. All the blades 20 are uniformly arranged around the core, and the sum of central angles of all the blades 20 is 360 degrees. The rotation angle of the blades 20 is 0-90 degrees, when the blades 20 rotate to the 0-degree position, the edges of the two sides of all the blades 20 are sequentially connected to form a circular surface to block the inside of the cylinder 10, and when the blades 20 rotate to the 90-degree position, all the blades 20 are parallel to each other, and the inside of the cylinder 10 is smooth.

A plurality of reinforcing ribs 14 are connected between the core body 11 and the inner wall of the cylinder 10. In this embodiment, the number of the reinforcing ribs 14 is 3, and the reinforcing ribs are disposed around the core at a distance of 120 ° and spaced apart from the blades 20 in the axial direction of the cylinder 10. In this embodiment, the number of the blades 20 is 9, and a rotation limiting piece 22 is further provided on one of the blades 20, and the rotation limiting piece 22 can abut against the corresponding reinforcing rib 14 when the blade 20 rotates to 90 ° and abut against the adjacent blade when the blade rotates to 0 °, so as to limit the rotation angle of the blade 20, and make the adjustment more accurate.

As shown in fig. 1 and 2, the linkage adjustment mechanism 30 is disposed on the barrel 10 of the petal type damper, and includes a plurality of rotation units and a plurality of straight rods 31 connected with the rotation units, which are equally spaced along the circumference of the barrel 10. The number of the rotating units corresponds to the number of the blades 20, and is also odd, so that the installation can be prevented from being influenced by over-positioning.

The rotating unit comprises a bearing seat 32 arranged on the side wall of the cylinder body 10, a rotating shaft 33 matched with the bearing seat 32 and a rotating arm 34 connected to one end of the rotating shaft 33, and the other end of the rotating shaft 33 penetrates through the side wall of the cylinder body 10 to be connected with the blades 20 of the air damper in a one-to-one correspondence mode.

As shown in fig. 7 and 8, the rotating arm 34 is a strip-shaped plate bent into five sections along four bending lines, and includes a middle section 341 connected with the rotating shaft 33, two connecting sections 342 at two ends, and two transition sections 343 connecting the middle section 341 and the connecting sections 342 at two ends. The middle section 341 and the connecting section 342 on both sides of the same transition section 343 are respectively folded in opposite directions. The two bend lines separating the middle section 341 and the transition section 343 are parallel to each other, and the two bend lines separating the transition section 343 and the connecting section 342 are parallel to each other. The two connecting sections 342 on each rotating arm 34 are respectively connected with the connecting sections 342 on the same side on the adjacent rotating arm 34 through the straight rod 31, so that linkage is realized.

As shown in fig. 7 to 10, in the present embodiment, the whole length of the rotating arm is 194.6mm, the width is 45mm, the bending angle between the middle section 341 and the adjacent transition section 343 is 25 °, and the bending angle between the transition section 343 and the adjacent connecting section 342 is 27.2 °. When the rotating arm 34 is manufactured, a plate made of Q235A material and 6mm in thickness is used as a raw material, blanking is carried out through laser cutting according to the outline of the rotating arm 34, bending lines are formed through laser lithography at four positions needing to be bent, a semi-finished product is bent at a preset angle along the bending lines, and a round angle with the radius of 6mm is formed at the bending positions.

During assembly, the bent rotating arms can realize angle compensation, have good adaptation degree with the side wall of the cylinder body, and are easy to assemble, so that all the rotating arms 34 and the straight rods 31 in the linkage adjusting mechanism 30 can be sequentially connected to form a closed loop, and meanwhile, good flexibility is ensured during linkage. In practical applications, the appropriate bending angle may be set according to the number of blades 20, the size of the rotating arm 34, the position of the bending line, the length of the straight rod 31, and so on.

Further, as shown in fig. 2 and 5, a through hole 344 matching with the rotation shaft 33 is formed in the middle section 341 of the rotation arm 34, and the rotation shaft 33 is inserted into the through hole 344 of the rotation arm 34 and fixed by welding. The connecting section 342 of the rotating arm 34 is also provided with a threaded connecting hole 345, and a ball head 351 is arranged at the threaded connecting hole 345. The two ends of the straight rod 31 are respectively provided with a positive thread and a negative thread, and are connected with rod end joint bearings 352 matched with the ball head 351 through threads, the straight rod 31 is also provided with two locking nuts 353 with opposite rotation directions, and the two locking nuts 353 can respectively lock the two rod end joint bearings 352.

Further, the rotating unit further includes a bearing mounting plate 36 welded to the outer sidewall of the cylinder 10, and the bearing housing 32 is fastened to the bearing mounting plate 36 by a plurality of first bolts 321. The bearing mounting plate 36 is provided with a rotating shaft mounting hole 361 which is in clearance fit with the rotating shaft 33 in the middle, the bottom of the bearing mounting plate 36 is provided with a gasket mounting groove 362, the side wall of the cylinder body 10 is provided with a rotating shaft connecting hole 15, the gasket mounting groove 362 and the rotating shaft connecting hole 15 jointly form a cavity, a positioning gasket 37 which is consistent with the cavity shape is arranged in the cavity, and the middle of the positioning gasket 37 is provided with a rotating shaft positioning hole 371 which is matched with the rotating shaft 33. The rotating shaft 33 is also sleeved with a spring retainer ring 38 for the shaft at the position, close to the positioning gasket 37, on one end of the inner side of the cylinder body 10, the spring retainer ring 38 can prevent axial movement, the influence of impact and vibration on the bearing in the running process of the equipment is reduced, the service life of the bearing can be prolonged, and the stability of the equipment is improved.

Further, the rotating unit further includes a cylindrical shaft sleeve 39 sleeved on the rotating shaft 33, and the shaft sleeve 39 is in clearance fit with the rotating shaft 33 and is located between the bearing seat 32 and the rotating arm 34, so that axial positioning can be performed, the rotating arm 34 and the bearing seat 32 keep a certain distance, and interference between the rotating arm 34 and the first bolt 321 for installing the bearing seat 32 is avoided.

Further, as shown in fig. 11 (a) and 11 (b), the broken line in the drawing indicates a bending line, and the rotating arm 34 is divided into a forward rotating arm 34a and a reverse rotating arm 34b which are opposite in bending direction. In the plurality of rotary units surrounding the outer side wall of the cylinder 10, the forward rotary arms 34a and the reverse rotary arms 34b are alternately arranged at intervals, that is, the rotary arms 34 in one rotary unit are the forward rotary arms 34a, and the rotary arms 34 in the adjacent rotary units on both sides are the reverse rotary arms 34b.

Specifically, one of the plurality of rotating units serves as a driving rotating unit, and the rest serves as a driven rotating unit. As shown in fig. 5 and 6, in the present embodiment, the rotation shaft 33 in the driving rotation unit is referred to as a driving rotation shaft 33a, the rotation shaft 33 in the driven rotation unit is referred to as a driven rotation shaft 33b, and the length of the driving rotation shaft 33a is longer than the length of the driven rotation shaft 33 b.

Further, a handle 41 for driving the driving rotation shaft 33a to rotate is provided at one end of the driving rotation shaft 33a located outside the cylinder 10. In this embodiment, the handle 41 has a cylindrical extension 411 at one end, and the cylindrical extension 411 is sleeved on the driving rotation shaft 33a and fixed by a flat key 412.

Further, as shown in fig. 1 and 2, a bolt hole 413 is formed at the other end of the handle 41, a fan-shaped angle limiting plate 42 is further arranged at the outer side of the cylinder 10, a plurality of positioning holes 421 corresponding to the bolt hole 413 are formed in the angle limiting plate 42 at equal intervals along the circumferential direction, and the bolt hole 413 is connected with one of the positioning holes 421 through a bolt. The bolt can be pulled down when adjusting the air damper, and the bolt is reinserted into the bolt hole and the corresponding positioning hole after the adjustment is finished, so that the handle 41 can be locked at a required angle, the handle 41 is prevented from accidentally rotating to drive the blade 20 to rotate, and the accuracy and the stability of the opening and closing angle of the air damper are improved.

In this embodiment, two operation holes 414 are further formed on two sides of the latch hole 413 on the handle 41, and are used for connecting with an electric actuator, and controlling the opening and closing of the damper by connecting with the electric actuator; in practical applications, the handle 41 may be directly manually rotated to operate.

When the opening and closing angle of the petal type damper is required to be adjusted, the handle 41 is rotated to enable the driving rotating shaft 33a connected with the handle 41 to rotate together, meanwhile, the driving rotating shaft 33a drives all the driven rotating shafts 33b to synchronously rotate through the straight rod 31 and the rotating arm 34, the driving rotating shaft 33a and the driven rotating shafts 33b respectively drive the corresponding blades 20 to rotate by the same angle, so that gaps between the adjacent blades 20 for fluid to pass through are reduced or increased, and finally air quantity adjustment is achieved.

Further, in one of the driven rotary units adjacent to the driving rotary unit, the driven rotary shaft 33b is provided with a threaded mounting hole along the axial direction at one end of the outer side of the cylinder 10 and is provided with a pointer 44 through a second bolt 43, the outer side of the cylinder 10 is further provided with a sector ring-shaped dial 45, the pointer 44 is matched with the dial 45, the rotary angle of the blade 20 can be indicated, and the opening and closing condition of the air damper can be displayed more intuitively and accurately.

The above embodiments are preferred examples of the present utility model, and are not intended to limit the scope of the present utility model.

Claims (10)

1. The utility model provides a linkage adjustment mechanism, sets up on the barrel of petal formula air damper, its characterized in that, includes along a plurality of rotary units of barrel circumference equidistant arrangement and connect a plurality of straight-bars of rotary unit, wherein:

the rotating unit comprises a bearing seat arranged on the side wall of the cylinder, a rotating shaft matched with the bearing seat and a rotating arm connected with one end of the rotating shaft, the other end of the rotating shaft penetrates through the side wall of the cylinder to be correspondingly connected with the blades of the air damper one by one,

the swinging boom is for buckling into five sections of strip shaped plates along four kink lines, include with the middle section that the rotation axis is connected, be located two linkage segments at both ends and link up the middle section with both ends two changeover portion of linkage segment, the middle section of same changeover portion both sides with the linkage segment is folded respectively to opposite direction, separates the middle section with two kink lines of changeover portion are parallel to each other, separate the changeover portion with two kink lines of linkage segment are parallel to each other, every two on the swinging boom the linkage segment is passed through respectively the straight-bar is adjacent lie in the homonymy on the swinging boom the linkage segment is connected.

2. The linkage adjustment mechanism of claim 1, wherein:

wherein the middle section of the rotating arm is provided with a through hole matched with the rotating shaft, the rotating shaft is arranged at the through hole of the rotating arm in a penetrating way and is fixed by welding,

a threaded connecting hole is also arranged on the connecting section of the rotating arm, a ball head is arranged at the threaded connecting hole,

the two ends of the straight rod are respectively provided with a positive thread and a negative thread, and are connected with a rod end joint bearing matched with the ball head through threads,

and two locking nuts with opposite rotation directions are further arranged on the straight rod and are used for locking the two rod end joint bearings respectively.

3. The linkage adjustment mechanism of claim 1, wherein:

the rotary unit further comprises a bearing mounting plate welded on the outer side wall of the cylinder body, the bearing seat is connected to the bearing mounting plate through a plurality of bolts in a fastening mode, a rotary shaft mounting hole in clearance fit with the rotary shaft is formed in the middle of the bearing mounting plate, a gasket mounting groove is formed in the bottom of the bearing mounting plate, a rotary shaft connecting hole is formed in the side wall of the cylinder body, a cavity is formed in the gasket mounting groove and the rotary shaft connecting hole together, a positioning gasket consistent with the cavity is arranged in the cavity, a rotary shaft positioning hole matched with the rotary shaft is formed in the middle of the positioning gasket, and a spring retainer ring for the shaft is sleeved on the rotary shaft close to the positioning gasket.

4. A linkage adjustment mechanism according to claim 3, wherein:

the rotating unit further comprises a cylindrical shaft sleeve sleeved on the rotating shaft, the shaft sleeve is in clearance fit with the rotating shaft, and the shaft sleeve is located between the bearing seat and the rotating arm and used for axial positioning.

5. The linkage adjustment mechanism of claim 1, wherein:

the rotary arms are divided into forward rotary arms and reverse rotary arms with opposite bending directions, and the forward rotary arms and the reverse rotary arms are alternately arranged at intervals in a plurality of rotary units surrounding the outer side wall of the cylinder body.

6. The linkage adjustment mechanism of claim 1, wherein:

one of the plurality of rotating units is a driving rotating unit, the other rotating units are driven rotating units, a rotating shaft in the driving rotating unit is a driving rotating shaft, a rotating shaft in the driven rotating unit is a driven rotating shaft, the length of the driving rotating shaft is larger than that of the driven rotating shaft, and a handle used for driving the driving rotating shaft to rotate is arranged at one end of the driving rotating shaft, which is located outside the cylinder body.

7. The linkage adjustment mechanism of claim 6, wherein:

the handle is provided with a bolt hole, a fan-shaped angle limiting plate is further arranged on the outer side of the barrel, a plurality of positioning holes corresponding to the bolt holes are formed in the angle limiting plate at equal intervals along the circumferential direction, and the bolt hole is connected with one of the positioning holes through a bolt so as to lock the handle.

8. The linkage adjustment mechanism of claim 7, wherein:

in one of the driven rotating units adjacent to the driving rotating unit, a threaded hole is formed in one end, located on the outer side of the cylinder, of the driven rotating shaft in the axial direction, a pointer is mounted through a bolt, a sector-shaped dial is further arranged on the outer side of the cylinder, and the pointer is matched with the dial and used for indicating the rotating angle of the blade.

9. A petal damper, comprising: a cylinder, an odd number of fan-shaped blades arranged inside the cylinder, and a linkage adjusting mechanism according to any one of claims 1 to 8.

10. The petal damper according to claim 9, wherein:

wherein the cylinder body is internally provided with a core body which comprises a core body main body, a core body lower cover and a core body blank cap which are respectively connected with two ends of the core body main body,

the center line of the blade is fixedly connected with a blade rotating shaft which is rotatably connected with the core body,

the novel rotary blade is characterized in that a plurality of reinforcing ribs are connected between the core body and the inner wall of the cylinder body, one of the blades is provided with a rotary limiting piece, and the rotary limiting piece abuts against the reinforcing ribs when the blade rotates to 90 degrees.