CN215908100U - Structure for monitoring and protecting fracture of driving connecting rod of movable blade adjustable axial flow fan - Google Patents
Structure for monitoring and protecting fracture of driving connecting rod of movable blade adjustable axial flow fan Download PDFInfo
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- CN215908100U CN215908100U CN202122358387.6U CN202122358387U CN215908100U CN 215908100 U CN215908100 U CN 215908100U CN 202122358387 U CN202122358387 U CN 202122358387U CN 215908100 U CN215908100 U CN 215908100U
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Abstract
The utility model relates to a movable blade adjustable axial flow fan driving connecting rod fracture monitoring and protecting structure which comprises an indicating shaft, a driving connecting rod and a servo motor, wherein the indicating shaft is connected with an input shaft of an electric actuator, the output end of the servo motor is connected with a driving arm, two ends of the driving connecting rod are respectively hinged with the indicating shaft and the driving arm, the movable blade adjustable axial flow fan driving connecting rod further comprises a telescopic spare rod, two ends of the telescopic spare rod are respectively hinged with the indicating shaft and the driving arm, a telescopic amount detection unit and a telescopic locking unit are arranged on the spare rod, the telescopic amount detection unit detects whether the telescopic amount of the spare rod exceeds a set value range, and when the telescopic amount of the spare rod is larger than the set value range, the telescopic locking unit locks the telescopic spare rod. The utility model has reasonable design, can monitor the bending or the fracture of the driving connecting rod, and the standby rod can play a role in protecting the driving connecting rod when the driving connecting rod is fractured, thereby ensuring that the movable blade of the fan can still be adjusted and effectively preventing the occurrence of production accidents.
Description
The technical field is as follows:
the utility model relates to a structure for monitoring and protecting fracture of a driving connecting rod of a movable blade adjustable axial flow fan.
Background art:
with the development of boiler units of thermal power plants towards high capacity and high parameter directions, the movable blade adjustable axial flow fan is gradually and widely applied to large boiler units as a main auxiliary device. The performance of the movable vane adjustable axial flow fan is adjusted by changing the working angle of the impeller vane (movable vane) through a hydraulic adjusting system. When the angle of the movable blade is changed, the air volume, the air pressure and the power of the movable blade are changed accordingly.
In the prior art, the hydraulic adjusting system is driven by an electric actuator, the electric actuator comprises a servo motor, a driving connecting rod, an indicating shaft and an electric actuator input shaft, the driving connecting rod drives the indicating shaft to rotate under the driving of the servo motor, and the indicating shaft drives the electric actuator input shaft to rotate, so that the opening of a movable blade is adjusted to change the output of the fan. But the driving connecting rod is bent and broken under the action of annual stress and rust corrosion. The drive connecting rod is bent to enable the opening of the movable blade to be inaccurately adjusted or break under the action of tensile force, so that the movable blade of the fan is unbalanced in stress and cannot keep constant opening, the opening of the movable blade is changed violently, and the output force is also changed violently to cause a series of production accidents.
The utility model has the following contents:
the utility model aims at solving the problems in the prior art, namely, the utility model aims to provide a structure for monitoring and protecting the fracture of the driving connecting rod of the movable blade adjustable axial flow fan, which has reasonable design and effectively prevents accidents.
In order to achieve the purpose, the utility model adopts the technical scheme that: the utility model provides a structure of axial fan drive connecting rod fracture monitoring and protection with adjustable movable vane, includes the instruction axle of being connected with the electric actuator input shaft, drive connecting rod, servo motor's output is connected with the actuating arm, the both ends of drive connecting rod are articulated mutually with instruction axle and actuating arm respectively, still include both ends also respectively with instruction axle and actuating arm articulated scalable reserve pole mutually, be provided with flexible volume detecting element and flexible locking unit on the reserve pole, flexible volume detecting element detects whether the flexible volume of reserve pole exceeds the setting value scope, and when the flexible volume of reserve pole was greater than the setting value scope, flexible locking unit is with the flexible locking of reserve pole.
Furthermore, the standby rod comprises an upper rod body and a lower rod body, the upper end of the upper rod body is hinged with the indicating shaft, and the lower end of the upper rod body is fixedly connected with the outer cylinder body; the lower end of the lower rod body is hinged to the driving arm, the upper end of the lower rod body extends into the outer cylinder body and is fixedly connected with the piston, and the piston is in sliding fit with the outer cylinder body.
Furthermore, the telescopic locking unit comprises an electromagnet fixedly installed at the lower end opening of the outer cylinder, and the electromagnet adsorbs the piston when being electrified.
Furthermore, the telescopic quantity detection unit comprises a displacement sensor arranged at the bottom of the electromagnet, a shaft core of the displacement sensor penetrates through the electromagnet and is fixedly connected to the bottom of the piston, and the piston drives the shaft core of the displacement sensor to displace.
And the control unit is electrically connected with the displacement sensor and the electromagnet, and controls the electromagnet to be electrified according to a signal detected by the displacement sensor.
The device further comprises an alarm module, wherein the alarm module is connected with the control unit, and when the signal detected by the displacement sensor exceeds a set value range, the control unit drives the alarm module to give an alarm prompt.
Furthermore, a pointer is installed on the input shaft of the electric actuator, and an opening degree indicating disc is arranged below the pointer.
Compared with the prior art, the utility model has the following effects: the utility model has reasonable design, can monitor the bending or the fracture of the driving connecting rod, and the standby rod can play a role in protecting the driving connecting rod when the driving connecting rod is fractured, thereby ensuring that the movable blade of the fan can still be adjusted and effectively preventing the occurrence of production accidents.
Description of the drawings:
FIG. 1 is a schematic construction of an embodiment of the present invention;
fig. 2 is a partial configuration diagram of a backup lever in the embodiment of the present invention.
The specific implementation mode is as follows:
the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description of the present invention, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
As shown in fig. 1-2, the structure for monitoring and protecting the fracture of the driving connecting rod of the movable blade adjustable axial flow fan comprises an indicating shaft 2, a driving connecting rod 3 and a servo motor 4, wherein one end of the indicating shaft 2 is connected with an input shaft 1 of an electric actuator, an output end of the servo motor 3 is connected with a driving arm 5, two ends of the driving connecting rod 3 are respectively hinged with the indicating shaft 2 and the driving arm 5, the structure further comprises a retractable spare rod 6 arranged beside the driving connecting rod 3, two ends of the spare rod 6 are respectively hinged with the indicating shaft 2 and the driving arm 5, the spare rod 6 is provided with a retractable amount detection unit and a retractable locking unit, the retractable amount detection unit detects whether the retractable amount of the spare rod exceeds a set value range (i.e. a retractable range), when the retractable amount of the spare rod 6 is larger than the set value range, the driving connecting rod 3 fractures at the moment, the retractable locking unit locks the retractable spare rod 6, the spare rod can not be stretched out and drawn back any more, and the spare rod replaces the drive connecting rod, guarantees that the fan movable vane still can be adjusted, effectively prevents the emergence of production accident. Through being connected telescopic spare pole between instruction axle and actuating arm, under normal operating condition (drive connecting rod is intact promptly), the drive connecting rod drives the instruction axle and rotates under servo motor's drive to adjust movable vane aperture and change the power of fan, spare pole is flexible along with the change of aperture this moment, nevertheless no matter how the aperture changes, the flexible scope of spare pole is fixed. When the telescopic amount detection unit detects that the telescopic amount of the standby rod is smaller than the set value range, the driving connecting rod is proved to be bent, and when the telescopic amount detection unit detects that the telescopic amount of the standby rod is larger than the set value range, the driving connecting rod is proved to be broken.
In this embodiment, the standby rod 6 is a split structure, and includes an upper rod body 7 and a lower rod body 8, the upper end of the upper rod body 7 is hinged to the indicating shaft 2, the lower end of the upper rod body 7 is fixedly connected to an outer cylinder body 9, and the bottom of the outer cylinder body 9 is provided with an opening; the lower end of the lower rod body 8 is hinged to the driving arm 5, the upper end of the lower rod body 8 extends into the outer cylinder 9 and is fixedly connected with the piston 10, the piston 10 is in sliding fit with the outer cylinder 9, the piston 10 can only move inside the outer cylinder 9, and the length of the outer cylinder 9 is larger than the normal moving range of the piston 10. A standby rod 6 is formed by an upper rod body 7, a lower rod body 8, an outer cylinder body 9 and a piston 10, and the upper rod body and the lower rod body form a telescopic structure with the outer cylinder body 9 through the piston 10. During operation, the movement position of the piston 10 changes along with the change of the opening degree, but the movement range of the piston 10 is fixed no matter how the opening degree changes, so the outer cylinder 9 is designed to be totally closed, the piston 10 can only move in the outer cylinder, and the length of the outer cylinder 9 is slightly longer than the movement range of the piston 10, so that the freedom of the movement of the piston is ensured.
In this embodiment, the telescopic locking unit includes an electromagnet 11 fixedly installed at the lower end of the outer cylinder 9, and the electromagnet 11 attracts the piston when energized. Adsorb the piston through the electromagnet, the flexible length of whole root spare pole 6 is the biggest this moment, and spare pole can't stretch out and draw back again, forms the integral type structure, can play the effect that acts as the drive connecting rod.
In this embodiment, the unit for detecting the amount of stretching and retracting includes a displacement sensor 12 installed at the bottom of an electromagnet 11, an axial core of the displacement sensor 12 passes through the electromagnet 11 and is fixedly connected to the bottom of a piston 10, and the piston 10 drives the axial core of the displacement sensor 12 to displace. The electromagnetic control device is characterized by further comprising a control unit 13, wherein the control unit 13 is electrically connected with the displacement sensor 12 and the electromagnet 11, and the control unit 13 controls the electromagnet 11 to be electrified according to a signal detected by the displacement sensor 12. The displacement sensor 12 is connected to the control unit 13 to measure the distance of the piston 10 from the bottom of the outer cylinder 9. If the driving connecting rod 3 is bent, the distance between the piston 10 and the bottom of the outer cylinder 9 is greatly increased, namely the displacement is greatly increased (namely the expansion amount of the standby rod is smaller than the normal expansion range); if the driving connecting rod 3 is broken, the opening degree of the movable blade under the action of the internal wind and smoke is increased, so that the indication shaft 2 is farther away from the driving arm 5 of the servo motor 4, the outer cylinder 9 is driven to move upwards, the piston 10 moves towards the bottom of the outer cylinder 9, and the piston 10 is instantly touched with the bottom of the outer cylinder 9 (at the moment, the piston displacement is 0, namely, the expansion amount of the standby rod is maximum); from the displacement distance, it can be quickly judged whether the drive link 3 is bent or broken. If the piston 10 displacement is detected to be 0, the control unit 13 enables the electromagnet 11 to be electrified to generate large magnetic force to suck the piston 10 (the piston is made of iron), so that the piston 10 and the outer cylinder 9 become the fixed standby rod 6, the fan movable blade is still adjustable under the condition that the driving connecting rod is broken, and production accidents are prevented.
In this embodiment, the device further includes an alarm module (not shown in the figure), the alarm module is connected to the control unit, when the signal detected by the displacement sensor exceeds a set value range, the driving link is bent or broken, and the control unit drives the alarm module to give an alarm prompt. It should be noted that displacement sensors, control units, alarm modules and electromagnets are all prior art. For example, a linear displacement sensor is adopted, and a single chip microcomputer or a PLC and the like can be adopted as the control unit.
In this embodiment, the electric actuator input shaft 1 is provided with a pointer 14, an opening degree indicating dial 15 is arranged below the pointer 14, and scales on the indicating dial are used for indicating the opening degree of a movable blade of a fan blade.
In this embodiment, the input shaft 1 of the electric actuator is longitudinally arranged, the indicating shaft 2 and the driving arm 5 are vertically distributed, the left end of the indicating shaft 2 is connected with the input shaft 1 of the electric actuator, and the right end is hinged with the upper end of the driving connecting rod 3; the left end of the driving arm 5 is fixedly connected with the output end of the servo motor 4, the right end of the driving arm is hinged with the lower end of the driving connecting rod 3, and the upper end and the lower end of the standby rod 6 are respectively hinged with the indicating shaft 2 and the driving arm 5.
It should be noted that, the structure that electric actuator input shaft, instruction axle, drive connecting rod, actuating arm and servo motor constitute is prior art, and it constitutes electric actuator for be connected with the control head of the hydraulic pressure governing system of movable vane adjustable axial fan, be used for driving hydraulic pressure governing system action, in order to realize adjusting movable vane aperture. The pointer is arranged on the input shaft of the electric actuator and rotates together with the input shaft of the electric actuator, and the pointer indicates the opening degree of the movable blade of the fan blade.
The utility model has the advantages that: not only realized crooked or cracked intelligent monitoring of drive connecting rod and reported to the police, under the cracked condition of drive connecting rod, realized the regulation protect function of reserve pole for the fan movable vane is still adjustable, will greatly effectively prevent the emergence of production accident.
If the utility model discloses or relates to parts or structures which are fixedly connected to each other, the fixedly connected parts can be understood as follows, unless otherwise stated: a detachable fixed connection (for example using bolts or screws) is also understood as: non-detachable fixed connections (e.g. riveting, welding), but of course, fixed connections to each other may also be replaced by one-piece structures (e.g. manufactured integrally using a casting process) (unless it is obviously impossible to use an integral forming process).
In addition, terms used in any technical solutions disclosed in the present invention to indicate positional relationships or shapes include approximate, similar or approximate states or shapes unless otherwise stated.
Any part provided by the utility model can be assembled by a plurality of independent components or can be manufactured by an integral forming process.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the utility model or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the utility model as defined by the appended claims.
Claims (7)
1. The utility model provides an axial fan drive connecting rod fracture monitoring and structure of protection with adjustable movable vane, includes the instruction axle of being connected with the electric actuator input shaft, drive connecting rod, servo motor's output is connected with the actuating arm, the both ends of drive connecting rod are articulated mutually with instructing axle and actuating arm respectively, its characterized in that: still include both ends also respectively with instruct axle and actuating arm looks articulated scalable reserve pole, be provided with flexible volume detecting element and flexible locking unit on the reserve pole, flexible volume detecting element detects whether the flexible volume of reserve pole exceeds the setting value scope, when the flexible volume of reserve pole is greater than the setting value scope, flexible locking unit is with the flexible locking of reserve pole.
2. The structure for monitoring and protecting the fracture of the driving connecting rod of the movable blade adjustable axial flow fan according to claim 1, wherein: the standby rod comprises an upper rod body and a lower rod body, the upper end of the upper rod body is hinged with the indicating shaft, and the lower end of the upper rod body is fixedly connected with the outer cylinder body; the lower end of the lower rod body is hinged to the driving arm, the upper end of the lower rod body extends into the outer cylinder body and is fixedly connected with the piston, and the piston is in sliding fit with the outer cylinder body.
3. The structure for monitoring and protecting the fracture of the driving connecting rod of the movable blade adjustable axial flow fan according to claim 2, characterized in that: the telescopic locking unit comprises an electromagnet fixedly installed at the lower end port of the outer cylinder body, and the electromagnet adsorbs the piston when being electrified.
4. The structure for monitoring and protecting the fracture of the driving connecting rod of the movable blade adjustable axial flow fan according to claim 3, wherein: the telescopic quantity detection unit comprises a displacement sensor arranged at the bottom of the electromagnet, a shaft core of the displacement sensor penetrates through the electromagnet and is fixedly connected to the bottom of the piston, and the piston drives the shaft core of the displacement sensor to displace.
5. The structure for monitoring and protecting the fracture of the driving connecting rod of the movable blade adjustable axial flow fan according to claim 4, wherein: the electromagnetic switch comprises a control unit, wherein the control unit is electrically connected with a displacement sensor and an electromagnet, and the control unit controls the electromagnet to be electrified according to a signal detected by the displacement sensor.
6. The structure for monitoring and protecting the fracture of the driving connecting rod of the movable blade adjustable axial flow fan according to claim 5, wherein: the displacement sensor is characterized by further comprising an alarm module, the alarm module is connected with the control unit, and when a signal detected by the displacement sensor exceeds a set value range, the control unit drives the alarm module to give an alarm prompt.
7. The structure for monitoring and protecting the fracture of the driving connecting rod of the movable blade adjustable axial flow fan according to claim 1, wherein: the electric actuator is characterized in that a pointer is installed on the input shaft of the electric actuator, and an opening degree indicating disc is arranged below the pointer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122358387.6U CN215908100U (en) | 2021-09-28 | 2021-09-28 | Structure for monitoring and protecting fracture of driving connecting rod of movable blade adjustable axial flow fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122358387.6U CN215908100U (en) | 2021-09-28 | 2021-09-28 | Structure for monitoring and protecting fracture of driving connecting rod of movable blade adjustable axial flow fan |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215908100U true CN215908100U (en) | 2022-02-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122358387.6U Active CN215908100U (en) | 2021-09-28 | 2021-09-28 | Structure for monitoring and protecting fracture of driving connecting rod of movable blade adjustable axial flow fan |
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| Country | Link |
|---|---|
| CN (1) | CN215908100U (en) |
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2021
- 2021-09-28 CN CN202122358387.6U patent/CN215908100U/en active Active
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