Actuator for a fire damper smoke damper

Abstract

The utility model relates to an actuator of fireproof smoke exhaust valve, it includes box, bottom plate, swing bar, L type swing arm, cylinder, ratchet wheel, electric drive mechanism and manual drive mechanism, swing arm cooperates through buckle one, two with swing bar, when double drive mechanism drives swing arm to rotate, swing arm and swing bar are unlocked and swing bar upper ratchet pawl separates from ratchet wheel, release cylinder to control smoke exhaust valve switch, manual drive mechanism contains revolving stage, rotary lever and return spring, the convex of uniform distribution is established to the lateral wall of revolving stage periphery, and screw rotary lever drives revolving stage to rotate, and the convex extrude the lug on connecting arm one, the manual drive mechanism in embodiment two contains pivot, torsional spring and fixed block, and torsional spring is fixed with the connecting portion of clamping sheet type in connecting arm one, and connecting arm one is formed operation end through box arc movable slot, and can drive to push, this actuator simplifies structure, reduces the number of parts and mould investment, reduces cost and promotes assembly efficiency, reduces transmission wear and failure risk simultaneously, and convenient and reliable operation.

Description

Technical Field

[0001] This utility model relates to the field of fire damper actuators, and in particular to an actuator for a fire-resistant smoke exhaust valve. Background Technology

[0002] As a core control component of building fire ventilation systems, smoke exhaust valves require actuators to simultaneously meet three core requirements: compact size, reliable drive, and controllable cost. Among existing technologies, the actuator of the smoke exhaust valve with patent number "202020930925.7" has proposed many optimized designs. For example, the length of the base plate is reduced by bending the second swing arm, achieving initial compactness of the actuator. At the same time, a dual drive path of electric drive and manual drive is set to meet the usage requirements of electric priority and manual backup, which is a certain progress in the industry.

[0003] However, its independent structure design of the manual drive device still has many defects that need to be improved, making it difficult to meet the requirements of reliable drive. For example, the manual drive device requires separate assembly of the pressure rod, return spring, button and trigger part. There are more than four parts related to manual drive alone. This not only increases the material procurement cost, but also requires additional design of pressure rod mounting holes, return spring positioning structure, etc., which leads to more processing steps for the base plate. At the same time, during assembly, it is necessary to ensure the coaxiality of the pressure rod and the trigger part, and the contact accuracy between the conical surface of the trigger part and the first connecting rod. Accumulated tolerances can easily cause assembly errors and reduce production efficiency. Furthermore, the driving force is transmitted through the line contact between the conical surface of the trigger part and the first connecting rod. After long-term use, the conical surface is prone to wear, which can reduce the contact area and cause slippage or incomplete drive. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides an actuator for a fireproof smoke exhaust valve.

[0005] The actuator of the fireproof smoke exhaust valve provided by this utility model adopts the following technical solution:

[0006] An actuator for a fireproof smoke exhaust valve includes a housing, a base plate, a rocker arm, a rocker rod, a roller, a ratchet, an electric drive mechanism, and a manual drive mechanism. The ratchet is fixed to the roller. The rocker arm has a pawl that abuts against the ratchet. The rocker arm is L-shaped and specifically includes a connecting arm one and a connecting arm two. The connection between the connecting arm one and the connecting arm two is rotatably connected to the base plate. The connecting arm two has a latch one and a latch two. One end of the rocker arm is hinged to the base plate, and the other end of the rocker arm is latched onto the latch one and the latch two. When the electric drive mechanism or the manual drive mechanism drives the rocker arm to rotate, the rocker arm and the rocker arm unlock, and the pawl disengages from the ratchet. The output end of the electric drive mechanism is connected to the connecting arm. First, a protrusion is provided at the end of the connecting arm away from the bend. The manual drive mechanism consists of a turntable, a rotating rod, a return spring, and a protrusion. The turntable is rotatably connected to the base plate via a mounting shaft. Several protrusions are spaced circumferentially on the outer side wall of the turntable. One end of the rotating rod is coaxially fixedly connected to the turntable, and the other end of the rotating rod passes through the housing and extends to the outside of the housing. When the rotating rod is turned, the rotating rod can drive the turntable to rotate synchronously, so that the protrusions on the turntable abut against and press the protrusion of the connecting arm, thereby driving the connecting arm to rotate the swing arm. One end of the return spring is fixed to the end of the connecting arm away from the second connecting arm, and the other side of the return spring is fixed to the base plate. The return spring applies a downward preload to the connecting arm.

[0007] Optionally, the protrusion and the connecting arm are fixedly connected by welding, threaded connection or high-strength adhesive, and the side of the protrusion facing the turntable is set as the force-bearing surface.

[0008] Optionally, the edges of the protrusions and bumps are set to be smooth and without sharp corners.

[0009] Optionally, the number of protrusions on the turntable is set to 3-4, and each protrusion is evenly distributed along the circumference of the turntable. The included angle between two adjacent protrusions is 90-120°, so as to ensure that the protrusions can quickly abut against the lugs when the rotating rod is turned, thereby reducing the operating stroke.

[0010] Optionally, the manual drive mechanism consists of a rotating shaft, a torsion spring, and a fixing block. One end of the rotating shaft is fixed at the connection between connecting arm one and connecting arm two, and the other end of the rotating shaft is rotatably connected to the base plate. The torsion spring is sleeved on the rotating shaft and is located between connecting arm one and the base plate. One end of the torsion spring is hooked onto connecting arm one at a position away from connecting arm two, and the other end of the torsion spring is hooked onto the fixing block. The fixing block is fixed to the base plate. A movable groove is provided on the side wall of the housing. The end of connecting arm one away from connecting arm two extends out of the movable groove, and connecting arm one rotates within the movable groove. When the swing arm is not under force, the torsion spring is in a pre-tightened state, and its elastic force direction causes buckle one or buckle two to lock with the swing arm.

[0011] Optionally, a connecting part is provided on the hook at one end of the torsion spring, and the end of the torsion spring is fixed to the connecting arm through the connecting part.

[0012] In summary, this utility model has at least one of the following beneficial technical effects:

[0013] 1. High component integration: manual drive requires only three core components: turntable, rotating rod, and reset spring. Compared with the prior patent, this reduces the number of parts, lowers material costs and base plate processing steps, reduces assembly tolerance accumulation, significantly improves production efficiency, and enhances drive reliability. The turntable protrusion and connecting arm protrusion are in surface contact with each other, and the edges of both are rounded and polished for easy turning. This avoids the problem of slippage or incomplete drive caused by wear and tear on the original conical surface after long-term use.

[0014] 2. The protrusion and connecting arm one are fixedly connected by welding, threaded connection or high-strength adhesive. Connecting arm one and protrusion one can be processed separately using existing general molds, without the need to develop a special composite mold for the integrated structure of connecting arm one.

[0015] 3. The manual drive mechanism consists only of a rotating shaft, a torsion spring, and a fixed block. There are no precision-machined parts such as a turntable or rotating rod. The rotating shaft can use existing standard shaft parts processing molds, and the torsion spring is a universal standard part. Furthermore, manual operation is more direct and convenient. The connecting arm extends directly to the outside of the housing to form the operating end. There is no need for indirect transmission through rotating rods, protrusions, and blocks. Manually pushing the operating end can directly drive the swing arm to rotate, reducing the wear and failure risk caused by the transmission links. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the actuator (excluding the housing) of a fireproof smoke exhaust valve in Embodiment 1.

[0017] Figure 2 This is a schematic diagram of the actuator (excluding the housing) of a fireproof smoke exhaust valve in Embodiment 2.

[0018] Figure 3 This is a schematic diagram of the actuator of a fireproof smoke exhaust valve in Embodiment 2.

[0019] Explanation of reference numerals in the attached drawings: 1. Box body; 11. Movable groove; 2. Base plate; 3. Swing rod; 4. Swing arm; 41. Connecting arm one; 411. Protrusion; 42. Connecting arm two; 421. Snap one; 422. Snap two; 5. Ratchet; 6. Pawl; 7. Electric drive mechanism; 8. Manual drive mechanism; 81. Turntable; 82. Rotating rod; 83. Return spring; 84. Protrusion; 85. Rotating shaft; 86. Torsion spring; 87. Fixing block; 88. Connecting part. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0022] Furthermore, "several" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0023] Example 1

[0024] Reference Figure 1An actuator for a fireproof smoke exhaust valve includes a housing 1, a base plate 2, a rocker arm 3, a swing arm 4, a roller, a ratchet 5, an electric drive mechanism 7, and a manual drive mechanism 8. The ratchet 5 is fixed to the roller. The rocker arm 3 is provided with a pawl 6 that abuts against the ratchet 5. The swing arm 4 is L-shaped and specifically includes a connecting arm 41 and a connecting arm 42. The connection between the connecting arm 41 and the connecting arm 42 is rotatably connected to the base plate 2. The connecting arm 42 is provided with a latch 421 and a latch 422. One end of the rocker arm 3 is hinged to the base plate 2, and the other end of the rocker arm 3 is latched to the latch 421. On buckle 21 and latch 422, after the electric drive mechanism 7 or the manual drive mechanism 8 drives the swing arm 4 to rotate, the swing arm 4 and the swing rod 3 unlock, and at the same time the pawl 6 disengages from the ratchet 5. The output end of the electric drive mechanism is connected to the connecting arm 41. The end of the connecting arm 41 away from the bend is provided with a protrusion 411. The manual drive mechanism 8 consists of a turntable 81, a rotating rod 82, a reset spring 83, and a protrusion 84. The turntable 81 is rotatably connected to the base plate 2 through a mounting shaft. Several protrusions 84 are provided circumferentially at intervals on the outer side wall of the turntable 81. One end of the rotating rod 82 is coaxially fixed to the turntable 81. Next, the other end of the rotating rod 82 passes through the housing 1 and extends to the outside of the housing 1. When the rotating rod 82 is turned, the rotating rod 82 can drive the turntable 81 to rotate synchronously, so that the protrusion 84 on the turntable 81 abuts against and presses the protrusion 411 of the connecting arm 1 41, thereby driving the connecting arm 1 41 to drive the swing arm 4 to rotate. One end of the return spring 83 is fixed to the end of the connecting arm 1 41 away from the connecting arm 2 42, and the other side of the return spring 83 is fixed to the base plate 2. The return spring 83 applies a downward preload to the connecting arm, and the end of the swing rod 3 is engaged with the buckle 421 of the connecting arm 2 42. The swing arm 4 and the swing rod 3 form a locking engagement. At this time, the pawl 6 on the swing rod 3 abuts against the ratchet 5 to restrict the rotation of the roller. When manual unlocking is required, the rotating rod 82 outside the housing 1 is turned. The rotating rod 82 drives the turntable 81 to rotate. The protrusion 84 on the side wall of the turntable 81 abuts against and presses the protrusion 411 on the connecting arm 1 as the turntable 81 rotates. The protrusion 411 is forced to rotate the swing arm 4. The latch 1 421 of the connecting arm 2 42 disengages from the end of the swing rod 3. The rear end of the swing rod 3 follows and engages with the latch 2 422 to unlock. At the same time, the swing rod 3 drives the pawl 6 to disengage from the ratchet 5.

[0025] This design achieves high component integration, requiring only 3 core components for manual drive: turntable 81, rotating rod 82, and reset spring 833. Compared to prior patents, this reduces the number of components, lowers material costs and processing steps for the base plate 2, reduces assembly tolerance accumulation, significantly improves production efficiency, and enhances drive reliability. The design utilizes the face contact between the turntable 81 protrusion 84 and the connecting arm 41 protrusion 411, with rounded edges and polished surfaces for easy screwing. This avoids the problem of slippage or incomplete drive caused by wear and tear on the original conical surface after long-term use.

[0026] The protrusion 411 and the connecting arm 41 are fixedly connected by welding, threaded connection or high-strength adhesive. The connecting arm 41 and the protrusion 411 can be processed separately using existing general molds. There is no need to develop a special composite mold for the integrated structure of the connecting arm 41. If integrated molding is used, the mold cavity or the punch and die of the stamping mold needs to be designed separately for the size and position of the protrusion 411. Not only is the mold development cost high, but the cycle is also long. The protrusion 411 can be mass-produced using standard parts or general molds. The side of the protrusion 411 facing the turntable 81 protrusion 84 is set as the force-bearing surface.

[0027] The number of protrusions 84 on the turntable 81 is set to 3-4, and each protrusion 84 is evenly distributed around the circumference of the turntable 81. The included angle between two adjacent protrusions 84 is 90-120°, which ensures that the protrusions 84 can quickly abut against the protrusions 411 when the rotating rod 82 is turned, thus reducing the operating stroke.

[0028] Example 2

[0029] The structure of the manual drive mechanism 8 differs from that of Embodiment 1. Specifically, it includes a rotating shaft 85, a torsion spring 86, and a fixing block 87. One end of the rotating shaft 85 is fixedly connected to the bent connection of the connecting arm 41 and the connecting arm 42 of the swing arm 4. The other end of the rotating shaft 85 is rotatably connected to the mounting hole of the base plate 2 via a bearing or bushing, enabling the swing arm 4 to rotate flexibly around the base plate 2. The torsion spring 86 is coaxially sleeved on the rotating shaft 85, and the entire torsion spring 86 is located in the gap between the connecting arm 41 and the base plate 2 to avoid motion interference with other components. One end of the torsion spring 86 is provided with a hook with a connecting part 88. The connecting part 88 is specifically a flat snap-fit ​​piece integrally formed with the hook. The snap-fit ​​piece is embedded in the pre-set slot at the end of the connecting arm 41 away from the connecting arm 42, thereby firmly fixing one end of the torsion spring 86 to the connecting arm 41. The hook at the other end of the torsion spring 86 is directly snapped onto the fixing block 87, which is fixed by welding. A curved movable groove 11 is provided on the side wall of the housing 1 at the position corresponding to the position where the connecting arm 41 protrudes. The center of the curved movable groove 11 coincides with the axis of the rotating shaft 85. The width of the movable groove 11 is 0.5-1mm larger than the thickness of the connecting arm 41. The end of the connecting arm 41 away from the connecting arm 42 passes through the curved movable groove 11 and extends to the outside of the housing 1, forming a manual operating end. When the operating end of the connecting arm 41 is manually pushed, the connecting arm 41... 41 can rotate around the rotating shaft 85 along the trajectory of the arc-shaped movable groove 11. The torsion spring 86 is always in a pre-tight state when the swing arm 4 is not under force. Its elastic force direction is opposite to the manual rotation direction of the connecting arm 41. It can continuously apply a reset torque to the connecting arm 41 to ensure that the swing arm 4 maintains its initial position when it is not driven, so that the buckle 421 on the connecting arm 42 is stably engaged with the swing rod 3, or drive the swing arm 4 back to its original position after driving, so that the buckle 421 is locked with the swing rod 3 again.

[0030] The advantage of this design is that the structure is simpler, eliminating the need for additional mold making and complex parts processing. The manual drive mechanism 8 consists only of a rotating shaft 85, a torsion spring 86, and a fixed block 87, without components such as a turntable 81 and a rotating rod 82 that require precision machining. The rotating shaft 85 can use existing standard shaft parts processing molds, and the torsion spring 86 is a universal standard part. Furthermore, manual operation is more direct and convenient. The connecting arm 41 extends directly to the outside of the housing 1 to form the operating end. There is no need for indirect transmission through the rotating rod 82, the protrusion 84, and the protrusion 411. Manually pushing the operating end can directly drive the swing arm 4 to rotate, reducing the wear and failure risk caused by the transmission links. In addition, the arc-shaped movable groove 11 can accurately limit the rotation trajectory of the connecting arm 41.

[0031] The above are all preferred embodiments of this utility model, and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape and principle of this utility model should be covered within the scope of protection of this utility model.

Claims

1. An actuator for a fireproof smoke exhaust valve, comprising a housing (1), a base plate (2), a rocker arm (3), a swing arm (4), a roller, a ratchet (5), an electric drive mechanism (7), and a manual drive mechanism (8), wherein the ratchet (5) is fixed on the roller, the rocker arm (3) is provided with a pawl (6) that abuts against the ratchet (5), the swing arm (4) is configured as an L-shape, and the swing arm (4) specifically includes a connecting arm one (41) and a connecting arm two (42), the connection point of the connecting arm one (41) and the connecting arm two (42) is rotatably connected to the base plate (2). The connecting arm 2 (42) is provided with buckle 1 (421) and buckle 2 (422). One end of the swing rod (3) is hinged to the base plate (2), and the other end of the swing rod (3) is engaged with buckle 1 (421) and buckle 2 (422). After the electric drive mechanism (7) or the manual drive mechanism (8) drives the swing arm (4) to rotate, the swing arm (4) and the swing rod (3) are unlocked, and the pawl (6) disengages from the ratchet (5). The output end of the electric drive mechanism is connected to the connecting arm 1 (41). The feature is that: The end of the connecting arm (41) away from the bend is provided with a protrusion (411). The manual drive mechanism (8) consists of a turntable (81), a rotating rod (82), a return spring (83), and a protrusion (84). The turntable (81) is rotatably connected to the base plate (2) via a mounting shaft. Several protrusions (84) are spaced circumferentially on the outer side wall of the turntable (81). One end of the rotating rod (82) is coaxially fixedly connected to the turntable (81), and the other end of the rotating rod (82) passes through the housing (1) and extends to the outside of the housing (1). When the rod (82) is turned, the rotating rod (82) can drive the turntable (81) to rotate synchronously, so that the protrusion (84) on the turntable (81) abuts against and squeezes the protrusion (411) of the connecting arm (41), thereby driving the connecting arm (41) to drive the swing arm (4) to rotate. One end of the reset spring (83) is fixed to the end of the connecting arm (41) away from the connecting arm (42), and the other side of the reset spring (83) is fixed on the base plate (2). The reset spring (83) applies a downward preload to the connecting arm (41).

2. An actuator for a fire damper according to claim 1, wherein: The protrusion (411) and the connecting arm (41) are fixedly connected by welding, threaded connection or high-strength adhesive, and the side of the protrusion (411) facing the turntable (81) with protrusion (84) is set as the force-bearing surface.

3. The actuator of a fireproof smoke exhaust valve according to claim 1, characterized in that: The edges of the protrusions (84) and bumps (411) are both set to be smooth and without sharp edges.

4. An actuator for a fire damper according to claim 1, wherein: The number of protrusions (84) on the turntable (81) is set to 3-4, and each protrusion (84) is evenly distributed along the circumference of the turntable (81). The included angle between two adjacent protrusions (84) is 90-120°, so as to ensure that the protrusions (84) can quickly abut against the protrusions (411) when the rotating rod (82) is turned, thus reducing the operating stroke.

5. A fire damper actuator according to claim 1, wherein: The manual drive mechanism (8) consists of a rotating shaft (85), a torsion spring (86), and a fixing block (87). One end of the rotating shaft (85) is fixed at the connection between the first connecting arm (41) and the second connecting arm (42), and the other end of the rotating shaft (85) is rotatably connected to the base plate (2). The torsion spring (86) is sleeved on the rotating shaft (85) and is located between the first connecting arm (41) and the base plate (2). One end of the torsion spring (86) is hooked onto the first connecting arm (41) at a position away from the second connecting arm (42). The other end of the torsion spring (86) is hooked to the fixing block (87), which is fixed on the base plate (2). The side wall of the box (1) is provided with a movable groove (11). The end of the connecting arm one (41) away from the connecting arm two (42) passes through the movable groove (11). The connecting arm one (41) rotates in the movable groove (11). The torsion spring (86) is in a pre-tightened state when the swing arm (4) is not under force. Its elastic force direction makes the buckle one (421) or the buckle two (422) lock with the swing rod (3).

6. A fire damper actuator according to claim 5, wherein: A connecting part (88) is provided on the hook at one end of the torsion spring (86), and the end of the torsion spring (86) is fixed to the connecting arm (41) through the connecting part (88).

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