Executing mechanism of fireproof valve

Abstract

The invention discloses a fireproof valve executing mechanism, and aims to solve the problems that the resetting operation of a valve clack of an existing executing mechanism is tedious, an elastic piece is rusted and aged due to the fact that impurities enter a shell and a groove is formed, and a resetting assembly is low in reliability. The executing mechanism comprises a bottom plate, a rotating shaft, a cam, a reset assembly, a swing frame and a control piece. The control piece comprises a mechanical control assembly and an elastic reset piece, automatic reset of the swing frame position can be achieved, the sealing performance is improved, and the product service life is prolonged. The reset assembly is composed of a first magnetic ring and a second magnetic ring which are coaxially arranged and have repulsive force, is arranged below the cam and can drive the rotating shaft to reset when the limiting shaft is separated from the notch. Compared with a traditional coil spring structure, performance degradation is avoided, and reliability and stability are improved. Meanwhile, by designing the structure of the magnetic ring, the number of the magnetic blocks and the installation angle, magnetic driving is optimized, and accurate resetting of the rotating shaft is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of fire dampers, and in particular to a fire damper actuator. Background Art

[0002] A fire damper is a fire-fighting device installed on ventilation and air-conditioning system pipes. It automatically closes through a temperature-triggered mechanism to prevent fire and smoke from spreading through the pipes in the event of a fire. The fire damper on the market consists of a valve body and a valve disc. The valve disc is connected to the valve body through a rotating shaft, and then the opening and closing actions are realized through an actuator connected to the rotating shaft.

[0003] The existing fire damper actuator mainly includes an electromagnetic component, a micro switch and a cam structure connected to the rotating shaft, wherein a lever is provided on one side of the cam structure, which can engage with the cam structure to lock the position of the rotating shaft and control the micro switch at the same time; and an operating lever is provided between the lever and the electromagnetic component, which can fix the position of the lever; with the current actuator, before the staff reset the valve disc, they need to manually reset the position of the lever, and then operate the rotating shaft to rotate it to ensure that the cam structure connected to the rotating shaft can achieve position locking with the lever.

[0004] However, the above structure requires one end of the lever to pass through the housing of the actuator to the outside to facilitate the staff to control the lever, and at the same time, a groove for the movement of the lever must be opened on the housing. This design not only increases the operating steps for the staff when resetting the valve disc, but the groove opened on the housing will also cause external impurities and dust to enter the interior of the actuator, causing the internal springs, coil springs and other elastic parts to easily fatigue and age due to dust accumulation and rust, affecting the normal operation of the actuator and reducing the service life of the product. Summary of the Invention

[0005] The main purpose of the present invention is to provide a fire damper actuator to solve the problems of cumbersome valve disc reset operation of existing actuators, and the ingress of impurities and dust due to the slots in the shell, which causes rust and aging of internal elastic parts, affects normal operation and shortens the service life of the product. At the same time, the reliability and stability of the reset component are improved to ensure that the shaft can be accurately reset.

[0006] To achieve the above objectives, the present invention provides a fire damper actuator, comprising a base plate and a rotating shaft rotatably mounted on the base plate, the rotating shaft being provided with a cam having a notched edge; a reset assembly and a swing frame mounted on the base plate, the swing frame being rotatably mounted on one side of the cam and having a limit shaft disposed above the swing frame that can engage with the notch; the reset assembly being disposed between the rotating shaft and the base plate and configured to drive the rotating shaft to reset when the limit shaft disengages the notch; It also includes a control component arranged on the base plate, which includes a mechanical control component and an elastic reset component. The mechanical control component is used to drive the swing frame to swing away from the cam; the elastic reset component is connected between the swing frame and the base plate, and is used to drive the swing frame to swing toward the side of the cam after the mechanical control component releases the force on the swing frame.

[0007] In a possible embodiment, the mechanical control component includes an electromagnet assembly and a rocker arm arranged on the base plate. The rocker arm is rotatably arranged on the base plate by a pin shaft, and one end of the rocker arm is connected to the electromagnet assembly, and the other end is connected to the end of the rocker frame on the base plate to form a lever structure. The section of the rocker arm that cooperates with the electromagnet assembly is the control section, and the section connected to the rocker arm is the driving section. When the rocker arm is subjected to external force, the driving section swings toward the end away from the rocker frame to drive the rocker frame to swing toward the side away from the cam.

[0008] In one possible embodiment, an abutment plate is extended vertically toward the driving section at one end of the swing frame close to the swing rod, and a driving plate is fixedly provided on the driving section to abut against one side of the abutment plate. The driving plate is located on the side of the abutment plate close to the cam, and is used to control the driving plate to drive the swing frame to swing away from the cam when the driving section drives it to move in an arc with the pin shaft as the center.

[0009] In a possible implementation, the elastic return member is a tension spring, one end of the tension spring is connected to an end of the swing frame close to the swing rod, and the other end is connected to the base.

[0010] In one possible embodiment, the reset assembly is located below the cam, and includes a first magnetic ring fixedly connected to the circumference of the rotating shaft and a second magnetic ring fixedly set on the base plate, the first magnetic ring and the second magnetic ring are coaxially arranged, and there is a repulsive force between the second magnetic ring and the first magnetic ring, and the first magnetic ring is driven to rotate by the repulsive effect of the second magnetic ring on the first magnetic ring; it also includes a limit plate fixedly set on the base and located on the movement path of the cam, and the limit plate is used to limit the rotation angle of the cam.

[0011] In one possible embodiment, the first magnetic ring includes a connecting ring fixedly connected to the rotating shaft, a plurality of slots are arranged at equal distances on the circumferential edge of the connecting ring, a mounting bracket is fixedly arranged in the slot, one end of the mounting bracket extends toward the second magnetic ring and is provided with a first magnetic block; the second magnetic ring includes a cylinder fixedly set on the bottom plate, a plurality of guide blocks are provided on the inner wall of the cylinder, a second magnetic block arranged opposite to the first magnetic block is provided on the guide block, and an isolation gap is provided between the second magnetic block and the first magnetic block.

[0012] In one possible embodiment, the mounting frame and the guide surface are both provided with mounting surfaces, and the normal direction of the mounting surfaces is inclined relative to the radial direction of the rotating shaft; the first magnetic block and the second magnetic block are respectively fixed to the mounting surfaces, and their opposing active surfaces are magnetic surfaces of the same polarity, for forming a magnetic repulsion effect; When the first magnetic block and the second magnetic block are relatively close and generate a repulsive force, the repulsive force is decomposed into a radial component and a tangential component along the inclined mounting surface, wherein the tangential component acts along the rotation direction of the shaft, thereby applying a driving torque to the shaft, causing it to rotate in the reset direction.

[0013] In a possible implementation manner, the ratio of the number of the first magnetic blocks to the number of the second magnetic blocks is 1:2.

[0014] In a possible embodiment, a limiting surface is formed on the cam and is in contact with one side of the limiting plate, a third magnetic block is protruding from the limiting surface, and a fourth magnetic block is provided on one side of the limiting plate and is attracted to the third magnetic block; it also includes a buffer panel arranged on the limiting plate and located on the side of the fourth magnetic block opposite to the third magnetic block, and a through hole is provided on the buffer panel to match the third magnetic block.

[0015] In one possible embodiment, a force-applying surface is formed on the cam, and the force-applying surface is located on the side of the cam that rotates relative to the force storage direction. A fifth magnetic block is provided on the force-applying surface, and a sixth magnetic block that can repel the fifth magnetic block is provided on the bottom plate. When the cam rotates to the force storage position, the notch is engaged with the limit shaft, and the fifth magnetic block and the sixth magnetic block are close to each other.

[0016] In summary, the beneficial effects of this application are: Compared with the prior art, the present application provides a control component for controlling the swing frame on the base plate, which is responsible for driving the swing frame to move closer to or away from the cam. The mechanical control component can drive the swing frame to swing away from the cam under the action of external force. After the mechanical control component releases the force, the elastic reset component can drive the swing frame to swing toward the side of the cam, thereby realizing automatic reset of the swing frame position. This design avoids the situation where a groove is opened on the shell to facilitate manual control of the lever like traditional actuators, greatly improves the sealing of the actuator, effectively blocks the invasion of external impurities and dust, solves the problem of rust and fatigue aging of internal elastic parts due to accumulation of impurities and dust, and significantly extends the service life of the product.

[0017] The reset component arranged between the rotating shaft and the base plate is located below the cam and consists of a first magnetic ring tightly fixedly connected to the circumference of the rotating shaft and a second magnetic ring firmly arranged on the base plate. The two magnetic rings are coaxially arranged and have a repulsive force between each other. The magnetic force of the second magnetic ring on the first magnetic ring can apply a driving torque to the rotating shaft, causing it to rotate in the reset direction, thereby realizing the reset of the rotating shaft; compared with the existing coil spring structure, it avoids the performance degradation problem of the coil spring caused by dust or rust, greatly improves the reliability and stability of the reset component, and increases the service life of the equipment; on the other hand, through the careful design of the magnetic ring structure, the number of magnetic blocks and the installation angle, the magnetic drive effect is further optimized, and a more stable and accurate reset driving force can be provided, ensuring that the rotating shaft can be reliably reset to the predetermined position every time, making its operation more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0019] Figure 1 It is the external structure diagram of the present invention; Figure 2 Schematic diagram of the internal structure of the present invention; Figure 3 This is a structural diagram of the control component of the present invention; Figure 4 for Figure 3 A magnified view of point A; Figure 5 It is a bottom structure diagram of the present invention; Figure 6 It is a partial schematic diagram of the fuse mechanism of the present invention; Figure 7 Schematic diagram of the coordination between the swing rod and the swing frame of the present invention; Figure 8 It is a schematic diagram of the cam structure of the present invention; Figure 9 for Figure 8 Enlarged view of point B; Figure 10 This is a diagram of the internal structure of the reset component; Figure 11 for Figure 10 Enlarged view of point C.

[0020] Description of Figure Numbers: 1. Base plate; 2. Rotating shaft; 3. Cam; 30. Notch; 4. Reset assembly; 40. First magnetic ring; 401. Connecting ring; 402. Mounting bracket; 403. First magnetic block; 41. Second magnetic ring; 411. Cylinder; 412. Guide block; 413. Second magnetic block; 42. Mounting surface; 5. Swing frame; 50. Limiting shaft; 6. Control element; 60. Mechanical control assembly; 601. Electromagnet assembly; 602. Swing rod; 612. Control section; 613, driving section; 603, pin shaft; 604, abutment plate; 605, driving plate; 61, elastic return member; 62, fuse; 621, tube body; 622, slide bar; 623, extrusion block; 624, fuse piece; 625, abutment spring; 7, limit plate; 8, third magnetic block; 9, fourth magnetic block; 10, buffer panel; 11, fifth magnetic block; 12, sixth magnetic block; 13, micro switch; 14, pressing member.

[0021] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of this application more clearly understood, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0023] like Figure 1-11 As shown, the present invention proposes a fire damper actuator, including a base plate 1 and a rotating shaft 2 rotatably set on the base plate 1, one end of the rotating shaft 2 passes through the base plate 1 and is fixedly connected to the valve stem of the externally connected valve disc, thereby realizing the connection with the valve disc, making it convenient for the staff to control the opening and closing of the valve disc through the rotating shaft 2; and in order to facilitate the user to operate and detect the rotating shaft 2, a handle is provided at the other end of the rotating shaft 2, through which the user can control the rotating shaft 2 more conveniently.

[0024] like Figure 2 As shown, a cam 3 is provided on the rotating shaft 2. The cross section of the rotating shaft 2 is hexagonal. There is a hexagonal hole on the cam 3. Through the hexagonal hole, the cam 3 can be stably mounted on the rotating shaft 2 and rotate synchronously with the rotating shaft 2.

[0025] like Figure 3 As shown, a notch 30 is provided on the edge of the cam 3, and a reset assembly 4 and a swing frame 5 are provided on the base plate 1. One end of the swing frame 5 is rotatably provided on the circumference of the cam 3, and a limiting shaft 50 that can be engaged with the notch 30 is provided on the side opposite to the cam 3. The limiting shaft 50 is used to limit the rotation and reset of the rotating shaft 2 by locking the cam 3; the reset assembly 4 is provided between the rotating shaft 2 and the base plate 1, and is used to drive the rotating shaft 2 to reset when the limiting shaft 50 is disengaged from the notch 30; It also includes a control component 6 arranged on the base plate 1 for driving the swing frame 5 to move away from or closer to the cam 3. The control component 6 includes a mechanical control component 60 and an elastic reset component 61. The mechanical control component 60 is used to drive the swing frame 5 to swing away from the cam 3 under the action of an external force; the elastic reset component 61 is connected between the swing frame 5 and the base plate 1, and is used to drive the swing frame 5 to swing toward the side of the cam 3 after the mechanical control component 60 releases the force on the swing frame 5.

[0026] When the fire damper actuator is working, the staff controls the opening and closing of the valve disc connected to it through the valve stem fixedly connected to one end of the rotating shaft 2, and can operate and inspect the rotating shaft 2 more conveniently through the handle set at the other end of the rotating shaft 2.

[0027] When the rotating shaft 2 rotates, due to its hexagonal cross-section, the cam 3 is stably mounted on the rotating shaft 2 through the hexagonal hole, thereby rotating synchronously with the rotating shaft 2. When the rotating shaft 2 needs to be restrained and reset, the limit shaft 50 on the side of the swing frame 5 opposite the cam 3 engages the notch 30 on the edge of the cam 3, thereby locking the cam 3 and thus restraining the rotating shaft 2. When the rotating shaft 2 needs to be reset, the control member 6 activates. Its mechanical control assembly 60, under the action of an external force, drives the swing frame 5 to swing away from the cam 3, causing the limit shaft 50 to disengage the notch 30 in the cam 3. At this time, the reset assembly 4, located between the rotating shaft 2 and the base plate 1, activates. Utilizing two coaxially arranged, repulsive first and second magnetic rings 40 and 41, the repulsive action of the second magnetic ring 41 on the first magnetic ring 40 drives the first magnetic ring 40 to rotate, thereby applying a driving torque to the rotating shaft 2, causing the rotating shaft 2 to rotate in the reset direction.

[0028] When the external force is released, the rocker arm 602 will reset under the action of the mechanical control component 60. At this time, since the elastic reset member 61 is connected between the rocker frame 5 and the base plate 1, it will drive the rocker frame 5 to swing toward the cam 3 so that the limit shaft 50 will engage with the notch 30 of the cam 3 again next time to limit the rotation reset of the rotating shaft 2.

[0029] Among them, such as Figure 2-4 As shown, the mechanical control component 60 includes an electromagnet component 601 and a rocker arm 602 arranged on the base plate 1. The electromagnet component 601 is an existing product, which is connected to the external circuit. At the same time, the moving iron core therein is hinged to one end of the rocker arm 602. The external circuit can realize the movement of the rocker arm 602 by extending and retracting the moving iron core, thereby realizing the control of the rocker frame 5.

[0030] The rocker arm 602 is rotatably arranged on the base plate 1 through a pin shaft 603, and one end of the rocker arm 602 is connected to the moving iron core in the electromagnet assembly 601, and the other end is connected to the end of the rocker frame 5 on the base plate 1 to form a lever structure. The section of the rocker arm 602 that cooperates with the electromagnet assembly 601 is the control section 612, and the section connected to the rocker arm 602 is the driving section 613. When the rocker arm 602 is subjected to external force, the driving section 613 will swing toward the end away from the rocker frame 5 to drive the rocker frame 5 to swing toward the side away from the cam 3.

[0031] At the same time, if Figure 5-6 As shown, it also includes a fuse 62 arranged on the base plate 1 and located in a section of the control section 612, which is a prior art, including a tube body 621 fixedly arranged on the base plate 1 and one end of which passes through the base plate 1 to the valve disc position. The tube body 621 is hollow, and a slide rod 622 is slidably arranged on its upper end. A conical extrusion block 623 is provided on the upper end of the slide rod 622. The extrusion block 623 is used to abut against the side of the rocker arm 602 when the slide rod 622 slides down, thereby driving the driving section 613 of the rocker arm 602 to swing toward the electromagnet assembly 601, so that the moving iron core retracts while the control section 612 drives the rocker frame 5 away from the cam 3 to release the lock on the cam 3.

[0032] The lower end of the slide bar 622 is fixedly connected to a fuse piece 624, and the lower end of the tube body 621 is also fixedly connected to a fuse piece 624. The two fuse pieces 624 are staggered and fixed together by solder with a melting point of 70 degrees Celsius or 280 degrees Celsius. At the same time, an abutment spring 625 is provided between the slide bar 622 and the tube body 621.

[0033] Under normal operating conditions, the electromagnet assembly 601 is connected to an external circuit, and its movable core is hinged to one end of the rocker arm 602. The rocker arm 602 is pivotally mounted on the base plate 1 via a pin 603. One end is connected to the movable core of the electromagnet assembly 601 as the control section 612, and the other end is connected to the end of the rocker arm 5 as the drive section 613, forming a lever structure on the base plate 1. When the external circuit controls the extension and retraction of the movable core of the electromagnet assembly 601, the rocker arm 602 rotates around the pin 603 as a fulcrum. If the movable core retracts, the control section 612 of the rocker arm 602 is stressed. Based on the principle of leverage, the drive section 613 swings away from the rocker arm 5, thereby driving the rocker arm 5 away from the cam 3. At this point, the stopper shaft 50, which was engaged with the notch 30 of the cam 3 on the rocker arm 5, disengages from the notch 30, releasing the lock on the cam 3. This allows the shaft 2 to rotate the valve disc back to its original position, completing the valve closing process.

[0034] At the same time, a micro switch 13 is also provided on the base plate 1, and a pressing member 14 acting on the micro switch 13 is provided on the swing frame 5. When the swing frame 5 releases the lock on the cam 3, the pressing member 14 moves away from the micro switch 13, so that the micro switch 13 sends a signal to the external equipment, so that the staff can know the situation.

[0035] The fuse 62 serves as a temperature-triggered safety mechanism in the entire system. The tube body 621 of the fuse 62 is fixed on the base plate 1, with one end penetrating the base plate 1 and connected to the valve disc position. The tube body 621 is hollow. The slide rod 622 is slidably arranged at the upper end of the tube body 621. A conical extrusion block 623 is installed at its upper end, and a fuse piece 624 is fixedly connected to the lower end. A fuse piece 624 is also fixed to the lower end of the tube body 621. The two fuse pieces 624 are staggered and fixed together by solder with a melting point of 70 degrees Celsius or 280 degrees Celsius. An abutment spring 625 is arranged between the slide rod 622 and the tube body 621.

[0036] When the temperature of the flue gas passing through the valve in the air duct rises to the melting point of the solder, the solder melts, and the connection between the two fuse links 624, originally secured by the solder, is lost. At this point, the slide bar 622 slides downward under the action of the abutment spring 625. As the slide bar 622 descends, the conical extrusion block 623 at its upper end abuts the side of the rocker arm 602. Due to the conical structure of the extrusion block 623, this abutment generates a force on the rocker arm 602 toward the electromagnet assembly 601. This force causes the rocker arm 602 to rotate about the pin 603, causing the drive section 613 to swing toward the electromagnet assembly 601. This swing causes the movable core of the electromagnet assembly 601, which is connected to the rocker arm 602, to retract. Simultaneously, the control section 612 of the rocker arm 602 drives the swing frame 5 away from the cam 3, disengaging the limit shaft 50 from the notch 30 of the cam 3 and releasing the lock on the cam 3. This process does not rely on active control of an external circuit. Instead, the temperature rise triggers the action of the fuse 62, thereby automatically adjusting the position of the swing frame 5, ensuring that when a fire occurs or the temperature rises abnormally, the fire damper can be closed in time, effectively preventing the fire and smoke from spreading through the pipeline.

[0037] Further, such as Figure 3-4 As shown, an abutment plate 604 is vertically extended toward the driving section 613 at one end of the swing frame 5 close to the swing rod 602, and a driving plate 605 is fixedly provided on the driving section 613 to abut against one side of the abutment plate 604. The driving plate 605 is located on the side of the abutment plate 604 close to the cam 3, and is used to control the driving plate 605 to drive the swing frame 5 to swing away from the cam 3 when the driving section 613 drives it to make an arc motion with the pin shaft 603 as the center.

[0038] When the moving iron core of the electromagnet assembly 601 retracts and contracts, it drives the hinged rocker 602 to rotate about the pin 603. At this point, the driving section 613 of the rocker 602 moves in an arc centered around the pin 603. Because the driving plate 605 is fixed to the driving section 613, and the end of the rocker frame 5 closest to the rocker 602 has an abutment plate 604 extending perpendicularly toward the driving section 613, and the driving plate 605 is located on the side of the abutment plate 604 closest to the cam 3, when the driving section 613 moves, the driving plate 605 moves with it and comes into contact with the abutment plate 604. Based on the principles of mechanical transmission, this abutment enables the driving plate 605 to push the abutment plate 604, thereby causing the rocker frame 5 to swing away from the cam 3.

[0039] This structure precisely controls the swing direction and amplitude of the swing frame 5. The tight contact between the drive plate 605 and the abutment plate 604 ensures that the swing frame 5 swings stably and accurately away from the cam 3, preventing deviation and ensuring that the fire damper closes promptly as designed, effectively preventing the spread of fire and smoke in the event of a fire. Furthermore, the coordination between the abutment plate 604 and the drive plate 605 enhances the stability of the connection between the swing frame 5 and the rocker 602. Compared to other connection methods, the tight contact between the vertically extending abutment plate 604 and the corresponding drive plate 605 better withstands the forces of movement, reduces component shake and looseness, improves the operational stability of the actuator, and extends its service life.

[0040] Furthermore, the elastic return member 61 is a tension spring, one end of which is connected to the end of the pendulum frame 5 closest to the pendulum rod 602, and the other end is connected to the base. When the electromagnet assembly 601 drives the pendulum rod 602, causing the pendulum frame 5 to swing away from the cam 3, the tension spring is stretched. This stores elastic potential energy because the external force changes the spring's shape, causing it to deform elastically.

[0041] When the electromagnet assembly 601 releases its force on the swing frame 5, the tension spring begins to release its stored elastic potential energy. Because one end of the tension spring is connected to the end of the swing frame 5 near the rocker 602 and the other end is connected to the base, the elastic potential energy causes the tension spring to contract, exerting a pulling force on the swing frame 5, causing it to swing toward the cam 3. Under this pulling force, the swing frame 5 overcomes a certain resistance and swings toward the cam 3 until it returns to its initial position, allowing the limit shaft 50 to reengage with the notch 30 of the cam 3, completing the reset process. This provides an automatic reset mechanism, ensuring that the swing frame 5 can reliably return to its position near the cam 3 after the force from the electromagnet assembly 601 is removed, ready for the next possible actuation and ensuring the continuity and stability of the fire damper actuator. Compared to the prior art process that requires manual reset of the rocker 602, this method avoids the tedious manual reset of the swing frame 5. Furthermore, it eliminates the need for additional slots in the housing, reducing the risk of external impurities and dust entering the housing through the slots and affecting the elastic element.

[0042] In addition to the above, existing fire dampers all use a coil spring for the reset assembly 4 that controls the rotational reset of the shaft 2. Typically, the coil spring is helically wound around the shaft 2. Therefore, when dust, fibers, or metal debris in the air enter the actuator, they tend to accumulate in the coil spring's spiral gaps. This causes dust to form abrasive particles between the coil spring turns. When the coil spring rotates, the dust particles exacerbate friction between the spring wires. Furthermore, due to the coil spring's helical structure and rotational motion characteristics, it is more susceptible to dust and impurities than springs and tension springs. Dust accumulation increases frictional resistance and reduces elasticity, directly impacting the fire damper's reset reliability.

[0043] Therefore, based on the above structure, in order to solve the problem that the traditional coil spring is easily affected by the external environment and suffers from fatigue, rust and wear, it makes it difficult for workers to overcome the force of the coil spring to reset the rotating shaft 2. At the same time, the coil spring will get stuck after aging and cannot be reset in time.

[0044] like Figure 7-11 As shown, in the present application, the reset assembly 4 is located below the cam 3, and includes a first magnetic ring 40 fixedly connected to the circumference of the rotating shaft 2 and a second magnetic ring 41 fixedly arranged on the base plate 1. The first magnetic ring 40 and the second magnetic ring 41 are coaxially arranged. There is a repulsive force between the second magnetic ring 41 and the first magnetic ring 40. The repulsive effect of the second magnetic ring 41 on the first magnetic ring 40 is used to drive the first magnetic ring 40 to rotate; it also includes a limit plate 7 fixedly arranged on the base and located on the movement path of the cam 3. The limit plate 7 is used to limit the rotation angle of the cam 3.

[0045] By providing a reset assembly 4 below the rotating shaft 2 to achieve the automatic rotation and reset function of the rotating shaft 2, the automation level and reliability of the actuator are further improved. The reset assembly 4 includes a first magnetic ring 40 fixedly connected to the circumference of the rotating shaft 2 and a second magnetic ring 41 fixedly mounted on the base plate 1. The two are coaxially arranged and structurally form a mutually repulsive magnetic field relationship. When the rotating shaft 2 drives the first magnetic ring 40 to deviate from the initial position, the second magnetic ring 41 will exert a continuous repulsive force on the first magnetic ring 40. This repulsive force acts between the magnetic rings in the radial spacing direction, and through the inclined installation structure of the magnetic block, the repulsive force is effectively converted into a tangential component in the direction of the rotating shaft 2, thereby forming a stable rotational torque. This torque is sufficient to drive the rotating shaft 2 to automatically rotate in the predetermined reset direction, thereby driving the valve disc back to the closed or initial position, achieving reset control without manual intervention.

[0046] Furthermore, a limit plate 7, fixed to the base and positioned along the motion path of cam 3, effectively limits the rotation angle of cam 3, ensuring that the rotation range of shaft 2 remains within safe control and preventing impact or misalignment caused by excessive rotation. The coordinated cooperation of the magnetic reset and limit mechanism not only ensures the precision and consistency of the actuator's movement but also reduces the probability of failure due to elastic fatigue or corrosion within the mechanism by eliminating the traditional coil spring structure. This results in a simpler structure, longer lifespan, and easier maintenance.

[0047] like Figure 10-11 As shown, the first magnetic ring 40 includes a connecting ring 401 fixedly connected to the rotating shaft 2, and a plurality of slots are arranged at equal distances on the circumferential edge of the connecting ring 401. A mounting bracket 402 is fixedly arranged in the slot, and one end of the mounting bracket 402 extends toward the second magnetic ring 41 and is provided with a first magnetic block 403; the second magnetic ring 41 includes a cylinder 411 fixedly set on the base plate 1, and a plurality of guide blocks 412 are provided on the inner wall of the cylinder 411. A second magnetic block 413 arranged opposite to the first magnetic block 403 is provided on the guide block 412, and an isolation gap is provided between the second magnetic block 413 and the first magnetic block 403.

[0048] Through the above structure, the first magnetic ring 40 is fixedly mounted on the side of the rotating shaft 2 via a connecting ring 401. Several slots are evenly arranged along the edge of the connecting ring 401. Mounting brackets 402 are installed in these slots, extending toward the second magnetic ring 41. Each mounting bracket 402 is equipped with a first magnetic block 403. Correspondingly, the second magnetic ring 41 is fixedly mounted on the base plate 1 in the form of a cylinder 411. Its inner wall is provided with several guide blocks 412. Each guide block 412 is equipped with a second magnetic block 413, which is in a corresponding relationship with the corresponding first magnetic block 403. To prevent magnetic short circuits and physical interference, an isolation gap is retained between the first magnetic block 403 and the second magnetic block 413, so that they are always in a non-contact magnetic repulsion zone.

[0049] During the rotation of the shaft 2, the connecting ring 401 rotates along with the shaft 2, driving the first magnetic blocks 403 on the first magnetic ring 40 to move synchronously along the circumference. When the first magnetic blocks 403 rotate away from their static position directly opposite the second magnetic blocks 413, a repulsive force is generated between the two sets of magnetic blocks of the same polarity. Due to the inclined arrangement of the magnetic block mounting surface 42, this magnetic repulsion not only provides a radial ejection effect but also generates a significant tangential component along the inclined surface. This component exerts a rotational torque along the rotation direction of the shaft 2, thereby continuously pushing the shaft 2 back to its original reset position, achieving an automatic reset function.

[0050] This structure's operating principle relies on the spatial distribution of magnetic repulsion and the force decomposition mechanism of inclined surfaces. This effectively converts the originally linear repulsive force in the magnetic field into a torque output that drives shaft 2, eliminating the need for traditional elastic elements such as coil or torsion springs. Furthermore, a sealing cover is provided between connecting ring 401 and cylinder 411, enclosing the magnetic block structure. The absence of mechanical contact between the magnetic blocks not only reduces friction and wear, but also prevents the intrusion of dust and impurities that could affect reset performance.

[0051] Furthermore, the normal direction of the mounting surface 42 is inclined relative to the radial direction of the rotating shaft 2. The first magnetic block 403 and the second magnetic block 413 are respectively fixed on the mounting surface 42, and their opposing surfaces are magnetic surfaces of the same polarity, for forming a magnetic repulsion effect; When the first magnetic block 403 and the second magnetic block 413 are relatively close and generate a repulsive force, the repulsive force is decomposed into a radial component and a tangential component along the inclined mounting surface 42, wherein the tangential component acts along the rotation direction of the rotating shaft 2, thereby applying a driving torque to the rotating shaft 2, causing it to rotate in the reset direction.

[0052] The first magnetic block 403 and the second magnetic block 413 are respectively fixed to the mounting bracket 402 on one side of the rotating shaft 2 and the guide block 412 on the side of the base plate 1. The two magnetic blocks are respectively located on the mounting surface 42, and the normal direction of the mounting surface 42 is inclined relative to the radial direction of the rotating shaft 2. This inclined arrangement is the key to this solution. It ensures that the magnetic repulsive force generated by the two magnetic blocks when they approach each other no longer acts simply in the radial direction, but instead forms a force decomposition mechanism through the inclined surface.

[0053] When the rotating shaft 2 drives the first magnetic block 403 to rotate and gradually approaches the second magnetic block 413 fixed to the second magnetic ring 41, a stable magnetic repulsion is generated because the two magnetic surfaces have the same polarity. This repulsive force acts along the interaction surface between the two magnetic blocks and can be mechanically decomposed into two components on the inclined surface: a radial component, which manifests as the tendency of the two magnetic blocks to move away from each other; and a tangential component, which is the rotational driving force acting along the circumference of the rotating shaft 2.

[0054] It is this tangential force component, when distributed equally across multiple magnet groups, that creates a continuous, consistent resultant torque, directly applied to shaft 2, causing it to rotate in the desired reset direction. Because the first magnet 403 is rigidly connected to shaft 2, this torque is smoothly transmitted to shaft 2 and further to the valve disc, enabling the fire damper to automatically rotate back to its closed position.

[0055] Furthermore, the ratio of the number of the first magnetic blocks 403 to the number of the second magnetic blocks 413 is 1:2. By setting the number of the first magnetic blocks 403 to the second magnetic blocks 413 to 1:2, that is, each first magnetic block 403 corresponds to two second magnetic blocks 413, an asymmetric but rhythmically continuous magnetic force structure is formed.

[0056] As the shaft 2 rotates, the first magnet 403 approaches the second magnet 413 at two different locations along its path, resulting in multiple, continuous magnetic repulsion drives. Because magnetic repulsion is strongest when the magnets are relatively close, each time the first magnet 403 enters a new repulsive zone, it generates another repulsive force acting on the inclined mounting surface 42. This force is decomposed into a stable tangential component based on the angle of the mounting surface 42, continuously providing a consistent torque in the direction of rotation for the shaft 2.

[0057] Because a single first magnet 403 can interact with multiple second magnets 413 sequentially during rotation, the torque output during the entire resetting process is no longer a single, brief, instantaneous thrust. Instead, it is a rhythmic and continuous driving force sequence, ensuring that the rotating shaft 2 is always driven in a consistent direction during rotation. This structural design not only enhances the smoothness and reliability of the resetting action of the rotating shaft 2, but also avoids the problem of insufficient torque caused by the limited range of action of a single magnet, thereby effectively improving resetting efficiency and action continuity.

[0058] Through the 1:2 magnetic block configuration, the present invention achieves the purpose of improving the magnetic drive frequency and distribution density in a limited space, realizes stronger driving ability with a simpler structure, and further optimizes the reset performance of the rotating shaft 2, solving the reset hysteresis or uneven torque problems existing in traditional structures.

[0059] Further, such as Figure 8 -As shown, a limiting surface is formed on the cam 3 and is in contact with one side of the limiting plate 7. A third magnetic block 8 is protruding from the limiting surface, and a fourth magnetic block 9 is provided on one side of the limiting plate 7 and is attracted to the third magnetic block 8. It also includes a buffer panel 10 provided on the limiting plate 7 and located on the side of the fourth magnetic block 9 opposite to the third magnetic block 8. A through hole adapted to the third magnetic block 8 is provided on the buffer panel 10.

[0060] By providing a limiting surface on the cam 3 structure, with a third magnetic block 8 protruding from this limiting surface, and a fourth magnetic block 9 positioned on one side of the limiting plate 7 that abuts against it, and engaging with the third magnetic block 8, a magnetically locked end-position relationship is established. When the shaft 2 rotates, driving the cam 3 to the set end angle, the third magnetic block 8 faces the fourth magnetic block 9. The attraction between the two due to the opposite magnetic poles causes the cam 3 to be firmly magnetically fixed in the limiting position, thus stably maintaining the end position of the shaft 2 and ensuring the stable closure of the valve disc.

[0061] At the same time, in order to further alleviate the impact problem that may occur during the magnetic attraction process, this solution also adds a buffer panel 10 on the limit plate 7, and sets a through hole adapted to the third magnetic block 8 on it, so that the third magnetic block 8 can be partially embedded in the through hole during the adsorption process, which can not only provide the adsorption positioning function, but also absorb the inertial impact force of the end rotation through the buffer panel 10 material, thereby preventing the magnetic block from being damaged and deformed or falling off due to severe impact.

[0062] Further, such as Figure 9 As shown, a force-applying surface is formed on the cam 3, and the force-applying surface is located on the side of the cam 3 that rotates relative to the force storage direction. A fifth magnetic block 11 is provided on the force-applying surface, and a sixth magnetic block 12 that can repel each other with the fifth magnetic block 11 is provided on the base plate 1. When the cam 3 rotates to the force storage position, the notch 30 is engaged with the limit shaft 50, and the fifth magnetic block 11 and the sixth magnetic block 12 are close to each other.

[0063] By disposing a fifth magnetic block 11 on the force-applying surface of cam 3 and a sixth magnetic block 12 on base plate 1 to repel it, a pair of magnetic elements with the same polarity and a repulsive relationship is formed. The force-applying surface is located in the direction of rotation of cam 3 about shaft 2, i.e., toward the reset activation angle. When cam 3 rotates to the set "force-storage position" after completing normal operation, notch 30 engages with limit shaft 50, and cam 3 is locked and ready for reset. At this time, the fifth magnetic block 11 and the sixth magnetic block 12 are relatively close and in a repulsive range.

[0064] Because the fifth magnetic block 11 is fixed to the cam 3 and rotates with the shaft 2, and the sixth magnetic block 12 is fixed to the base plate 1 and does not move, when the two magnetic fields overlap, a significant repulsive force is generated. The direction of this repulsive force is consistent with the rotational reset direction of the cam 3, and thus is structurally equivalent to an initial boost torque acting on the shaft 2. That is, when the system is ready to release from the static state and initiate the reset action, this magnetic repulsion can actively push the cam 3 away from the locked position, helping the shaft 2 overcome the initial static friction or mechanical resistance and smoothly enter the rotation state. This makes the reset component 4 have a more stable, fast, and interference-resistant operation performance, and improves the self-recovery ability and reliability of the fire damper actuator at critical moments.

[0065] On the basis of the above scheme, Figure 10-11 As shown, a thermal insulation layer is also provided on the inner wall of cylinder 411. This layer effectively blocks the transfer of high external temperatures to the interior, protecting key components within reset assembly 4, such as first and second magnetic rings 40 and 41. Because the magnetism of magnetic materials is generally affected by temperature, excessively high temperatures can weaken or even eliminate the magnetism, thereby affecting the reset assembly 4's ability to reset the rotating shaft 2 using magnetic repulsion. By reducing heat transfer, the thermal insulation layer ensures that the first and second magnetic rings operate within a suitable temperature range, maintaining their stable magnetism and magnetic repulsion. This ensures that the reset assembly 4 reliably resets the rotating shaft 2, allowing the fire damper actuator to operate normally even in high-temperature fire environments.

[0066] The same or similar numbers in the drawings of this embodiment correspond to the same or similar parts; in the description of this application, it should be understood that if the terms "upper", "lower", "left", "right", etc. indicate an orientation or position relationship, they are based on the orientation or position relationship shown in the drawings. This is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0067] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A fire damper actuator, comprising a base plate (1) and a rotating shaft (2) rotatably arranged on the base plate (1), wherein a cam (3) with a notch (30) on the edge is arranged on the rotating shaft (2); characterized in that: It also includes a reset assembly (4) and a swing frame (5) arranged on the bottom plate (1), wherein the swing frame (5) is rotatably arranged on one side of the cam (3), and a limit shaft (50) is arranged above the swing frame and can be engaged with the notch (30); the reset assembly (4) is arranged between the rotating shaft (2) and the bottom plate (1), and is used to drive the rotating shaft (2) to reset when the limit shaft (50) is separated from the notch (30); The invention also includes a control member (6) arranged on the base plate (1), wherein the control member (6) includes a mechanical control component (60) and an elastic reset member (61), wherein the mechanical control component (60) is used to drive the swing frame (5) to swing in a direction away from the cam (3); and the elastic reset member (61) is connected between the swing frame (5) and the base plate (1), and is used to drive the swing frame (5) to swing toward the side of the cam (3) after the mechanical control component (60) releases the force acting on the swing frame (5).

2. A fire damper actuator according to claim 1, characterized in that: The mechanical control component (60) includes an electromagnet component (601) and a rocker (602) arranged on the base plate (1). The rocker (602) is rotatably arranged on the base plate (1) through a pin shaft (603), and one end of the rocker (602) is connected to the electromagnet component (601), and the other end is connected to the end of the rocker frame (5) on the base plate (1) to form a lever structure. The section of the rocker (602) that cooperates with the electromagnet component (601) is a control section (612), and the section connected to the rocker (602) is a driving section (613). When the rocker (602) is subjected to an external force, the driving section (613) swings toward the end away from the rocker frame (5) to drive the rocker frame (5) to swing toward the side away from the cam (3).

3. A fire damper actuator according to claim 2, characterized in that: An end of the swing frame (5) close to the swing rod (602) is provided with an abutment plate (604) extending vertically in the direction of the driving section (613). A driving plate (605) is fixedly provided on the driving section (613) and is in abutment with one side of the abutment plate (604). The driving plate (605) is located on a side of the abutment plate (604) close to the cam (3) and is used to control the driving plate (605) to drive the swing frame (5) to swing in a direction away from the cam (3) when the driving section (613) drives it to make an arc motion with the pin shaft (603) as the center.

4. The fire damper actuator according to claim 1, characterized in that: The elastic reset member (61) is a tension spring, one end of which is connected to one end of the swing frame (5) close to the swing rod (602), and the other end of which is connected to the base.

5. A fire damper actuator according to any one of claims 1 to 4, characterized in that: The reset assembly (4) is located below the cam (3), and includes a first magnetic ring (40) fixedly connected to the circumference of the rotating shaft (2) and a second magnetic ring (41) fixedly arranged on the bottom plate (1), wherein the first magnetic ring (40) and the second magnetic ring (41) are coaxially arranged, and there is a repulsive force between the second magnetic ring (41) and the first magnetic ring (40), and the repulsive action of the second magnetic ring (41) on the first magnetic ring (40) drives the first magnetic ring (40) to rotate; and further includes a limit plate (7) fixedly arranged on the base and located on the movement path of the cam (3), wherein the limit plate (7) is used to limit the rotation angle of the cam (3).

6. The fire damper actuator according to claim 5, characterized in that: The first magnetic ring (40) includes a connecting ring (401) fixedly connected to the rotating shaft (2), a plurality of slots are arranged at equal distances on the peripheral edge of the connecting ring (401), a mounting frame (402) is fixedly arranged in the slot, one end of the mounting frame (402) extends toward the second magnetic ring (41) and is provided with a first magnetic block (403); the second magnetic ring (41) includes a cylinder (411) fixedly arranged on the bottom plate (1), a plurality of guide blocks (412) are arranged on the inner wall of the cylinder (411), a second magnetic block (413) arranged opposite to the first magnetic block (403) is arranged on the guide block (412), and an isolation gap is provided between the second magnetic block (413) and the first magnetic block (403).

7. The fire damper actuator according to claim 6, characterized in that: The mounting frame (402) and the guide surface are both provided with mounting surfaces (42), the normal direction of the mounting surface (42) being inclined relative to the radial direction of the rotating shaft (2), the first magnetic block (403) and the second magnetic block (413) being respectively fixed on the mounting surface (42), and their relative action surfaces are magnetic surfaces of the same polarity, for forming a magnetic repulsion effect; When the first magnetic block (403) and the second magnetic block (413) are relatively close and generate a repulsive force, the repulsive force is decomposed into a radial component and a tangential component along the direction of the inclined mounting surface (42), wherein the tangential component acts along the rotation direction of the rotating shaft (2), thereby applying a driving torque to the rotating shaft (2), causing it to rotate in the reset direction.

8. The fire damper actuator according to claim 7, characterized in that: The ratio of the number of the first magnetic blocks (403) to the number of the second magnetic blocks (413) is 1:

2.

9. The fire damper actuator according to claim 5, characterized in that: The cam (3) is formed with a limiting surface that is in contact with one side of the limiting plate (7), and a third magnetic block (8) is protruding from the limiting surface. A fourth magnetic block (9) that is attracted to the third magnetic block (8) is provided on one side of the limiting plate (7); and the cam (3) further includes a buffer panel (10) that is provided on the limiting plate (7) and is located on a side of the fourth magnetic block (9) opposite to the third magnetic block (8), and a through hole that is adapted to the third magnetic block (8) is provided on the buffer panel (10).

10. The fire damper actuator according to claim 9, characterized in that: A force-applying surface is formed on the cam (3), and the force-applying surface is located on the side of the cam (3) that rotates relative to the force storage direction. A fifth magnetic block (11) is provided on the force-applying surface, and a sixth magnetic block (12) that can repel the fifth magnetic block (11) is provided on the bottom plate (1). When the cam (3) rotates to the force storage position, the notch (30) is engaged with the limiting shaft (50), and the fifth magnetic block (11) and the sixth magnetic block (12) are close to each other.

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