Valve actuator with high safety performance

Abstract

The utility model relates to the technical field of industrial automation control and fluid control equipment, and discloses a valve actuator with high safety performance, which comprises a pipeline, the top of the pipeline is fixedly connected with an actuator shell, and a passive safety structure is arranged in the actuator shell. According to the valve actuator with the high safety performance, through a transmission system composed of a servo motor, a driving gear, a rack and a driven gear, the rotating motion of the motor is accurately converted into stable driving of the opening and closing action of the valve clack, and through an electromagnetic clutch mechanism composed of an electromagnet, a first spring and a clamping block, the safety performance is improved; reliable combination of power in a power-on state through the connecting block and instantaneous automatic release of power in power-off are achieved, through the second spring and the limiting block which are connected with the two ends of the rack, the rack can automatically buffer and reset to a safe position determined by the limiting block in the power-off or fault process, and therefore the valve clack is driven to return to a safe default state; and the intrinsic safety and reliability of the equipment are improved.

Description

Technical Field

[0001] This utility model relates to the field of industrial automation control and fluid control equipment technology, specifically a valve actuator with high safety performance. Background Technology

[0002] As a key terminal actuator in automated control systems, valve actuators are widely used in critical process industries such as petroleum, chemical, power, and municipal pipeline networks, responsible for driving valves to complete the opening, closing, and regulation of pipeline media.

[0003] Existing electric valve actuators still have significant shortcomings in safety and reliability when dealing with sudden power outages or loss of control signals. Most products rely on motor self-locking or external uninterruptible power supply systems to maintain the valve position. The former cannot operate after power failure, causing the valve to stop in an arbitrary and unknown position, which may lead to process disruption or even safety accidents. The latter has the problems of system complexity, high cost and battery failure risk. Therefore, a valve actuator with high safety performance is proposed to solve the above problems. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a valve actuator with high safety performance. It has the advantages of being able to passively and automatically reset to a safe position in the event of power failure or other faults, and has rapid power transmission and disengagement response and high reliability. It solves the problems of traditional actuators being highly dependent on continuous power, the valve state being uncontrollable after power failure, and the complexity and slow response of existing safety mechanisms.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a valve actuator with high safety performance, including a pipeline, an actuator housing fixedly connected to the top of the pipeline, and a passive safety structure provided inside the actuator housing;

[0006] The passive safety structure includes a servo motor, the output shaft of which is snapped with a connecting block, a rotating rod fixedly connected to the outside of the connecting block, a drive gear fixedly connected to the outside of the rotating rod, and a rack slidably connected to the inner bottom wall of the actuator housing.

[0007] Preferably, the rack has teeth on its top and left sides, and the top teeth of the rack mesh with the drive gear.

[0008] Preferably, a valve disc is rotatably connected inside the pipe, and a driven gear is fixedly connected to the top of the valve disc, with the left tooth of the rack meshing with the driven gear.

[0009] Preferably, a second spring is fixedly connected to the inner wall of the actuator housing. There are two second springs, which are respectively fixedly connected to both ends of the rack. A limit block is fixedly connected to the inner wall of the actuator housing, and the limit block is located inside the second spring.

[0010] Preferably, an electromagnet is fixedly connected inside the output shaft of the servo motor, and a first spring is fixedly connected outside the electromagnet, with a locking block fixedly connected to one end of the first spring.

[0011] Preferably, the connecting block has a T-shaped slot inside, the card block is engaged inside the T-shaped slot, and a magnet is provided inside the card block near the electromagnet.

[0012] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0013] This high-safety valve actuator achieves stable drive by precisely converting the motor's rotational motion into valve disc opening and closing action through a transmission system consisting of a servo motor, drive gear, rack, and driven gear. An electromagnetic clutch mechanism, composed of an electromagnet, a first spring, and a locking block, ensures reliable engagement of power via the connecting block when energized and instantaneous automatic disengagement of power when de-energized. A second spring and limit block connected to both ends of the rack automatically buffer and reset to the safe position determined by the limit block in the event of power failure or malfunction, thereby driving the valve disc back to its safe default state. Ultimately, through the comprehensive design of these passive safety structures, a valve actuator is achieved that can automatically trigger and return to a safe state mechanically without external commands when the power source is lost, greatly improving the inherent safety and reliability of the equipment. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is a front sectional view of the structure of this utility model;

[0016] Figure 3 This is a three-dimensional view of the connection between the drive gear and the valve disc in the structure of this utility model;

[0017] Figure 4 This is a left sectional view of the structure of this utility model;

[0018] Figure 5 for Figure 2 Enlarged view of point A in the middle.

[0019] In the diagram: 1. Pipeline; 2. Actuator housing; 3. Passive safety structure; 301. Servo motor; 3021. Locking block; 3022. Electromagnet; 3023. Connecting block; 3024. First spring; 303. Rotating rod; 304. Drive gear; 305. Rack; 306. Driven gear; 307. Valve disc; 308. Second spring; 309. Limit block. 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] Please see Figure 1-5 In this embodiment, a valve actuator with high safety performance includes a pipe 1, an actuator housing 2 is fixedly connected to the top of the pipe 1, and a passive safety structure 3 is provided inside the actuator housing 2.

[0022] The passive safety structure 3 includes a servo motor 301, the output shaft of the servo motor 301 is snapped with a connecting block 3023, a rotating rod 303 is fixedly connected to the outside of the connecting block 3023, a drive gear 304 is fixedly connected to the outside of the rotating rod 303, and a rack 305 is slidably connected to the inner bottom wall of the actuator housing 2.

[0023] The rack 305 has teeth on its top and left side. The top teeth of the rack 305 mesh with the drive gear 304 to receive the active driving force from the servo motor 301. The teeth on its left side mesh with the driven gear 306 to ultimately transmit the received power to the valve disc 307. Through this bidirectional tooth design, an effective and reliable power transmission path is achieved from the actuator to the valve body.

[0024] A valve disc 307 is rotatably connected inside the pipe 1. A driven gear 306 is fixedly connected to the top of the valve disc 307. The left tooth of the rack 305 meshes with the driven gear 306. By fixing the driven gear 306 to the top of the valve disc 307 and meshing the driven gear 306 with the left tooth of the rack 305, the linear motion of the rack 305 is accurately converted into the rotational motion of the driven gear 306 and the valve disc 307.

[0025] Two second springs 308 are fixedly connected to the inner wall of the actuator housing 2, respectively, and are fixedly connected to both ends of the rack 305. A limit block 309 is fixedly connected to the inner wall of the actuator housing 2. The limit block 309 is located inside the second springs 308. When the servo motor 301 is powered off or malfunctions, the two second springs 308 can absorb the kinetic energy of the rack 305 and push the rack 305 back to the mechanical neutral position determined by the limit block 309. This ensures that the rack 305 can automatically and reliably reset regardless of its position, thereby driving the valve disc 307 back to a safe default state such as the intermediate position or the closed position. No power is required to maintain this state, which improves the safety performance of the system.

[0026] An electromagnet 3022 is fixedly connected inside the output shaft of the servo motor 301, and a first spring 3024 is fixedly connected outside the electromagnet 3022. A locking block 3021 is fixedly connected to one end of the first spring 3024. The power transmission is controlled by energizing and de-energizing the electromagnet 3022. When energized, the electromagnet 3022 generates magnetic force, which overcomes the elastic force of the first spring 3024 and attracts the locking block 3021 to engage tightly with the connecting block 3023, thereby connecting the output shaft of the servo motor 301 to the transmission system. When de-energized, the electromagnetic force disappears, and the first spring 3024 pushes the locking block 3021 to retract, causing the power connection to automatically disengage, thus creating conditions for subsequent passive safety actions.

[0027] The connecting block 3023 has a T-shaped slot inside, and the locking block 3021 is locked inside the T-shaped slot. A magnet is provided inside the locking block 3021 near the electromagnet 3022. The function of the T-shaped slot and the locking block 3021 is to ensure the reliability of torque transmission when the power is engaged, and to allow the locking block 3021 to slide in and out smoothly along a specific trajectory. The magnet inside the locking block 3021 enhances the attraction between it and the electromagnet 3022 when energized, ensuring a more stable power engagement. When the power is off, the elastic force of the first spring 3024 is sufficient to overcome the remaining weak magnetic force, achieving quick and complete disengagement, which improves the sensitivity and reliability of the clutch response.

[0028] When implementing this procedure, please follow these steps:

[0029] 1) First, the system is initialized and powered on. The power is connected to the servo motor 301 and the electromagnet 3022. At this time, the electromagnet 3022 is energized and generates magnetic force, which attracts the locking block 3021 to move inward against the elastic force of the first spring 3024, so that the locking block 3021 is firmly locked into the T-shaped slot of the connecting block 3023, thus completing the power connection between the output shaft of the servo motor 301 and the transmission system.

[0030] 2) Then, normal drive operation is performed. The control system sends a command to the servo motor 301 to make its output shaft rotate as required. The power is transmitted to the drive gear 304 through the connecting block 3023 and the rotating rod 303 in sequence. The rotation of the drive gear 304 drives the rack 305 meshing with it to make linear motion.

[0031] 3) Next, the opening and closing control of the valve is realized. The linear motion of the rack 305 drives the driven gear 306 to rotate through the teeth on its side, thereby driving the valve disc 307, which is fixedly connected to the driven gear 306, to rotate inside the pipeline 1, so as to realize precise control of the flow of the medium. During this process, the range of motion of the rack 305 is buffered and mechanically limited by the second spring 308 at both ends and the limit block 309.

[0032] 4) Finally, the passive safety protection is triggered. When an unexpected power outage occurs, the electromagnet 3022 instantly loses its magnetism. The first spring 3024 quickly pushes the locking block 3021 away from the connecting block 3023, cutting off the power connection between the servo motor 301 and the transmission chain. At the same time, the two second springs 308 release elastic potential energy, pushing the rack 305 to reset to the mechanical neutral position determined by the limit block 309, thereby driving the driven gear 306 and the valve disc 307 to rotate synchronously to the safe default closed or open state, completing the passive safety protection without external energy.

[0033] In summary, this high-safety valve actuator, through a transmission system consisting of a servo motor 301, a drive gear 304, a rack 305, and a driven gear 306, achieves stable drive by precisely converting the motor's rotational motion into the opening and closing action of the valve disc 307. By incorporating an electromagnetic clutch mechanism consisting of an electromagnet 3022, a first spring 3024, and a locking block 3021, it ensures reliable engagement of power via the connecting block 3023 when energized and instantaneous automatic disengagement of power when de-energized. Furthermore, by providing a second spring 308 and a limit block 309 connected to both ends of the rack 305, it ensures that the rack 305 automatically buffers and resets to the safe position determined by the limit block 309 in the event of power failure or malfunction, thereby driving the valve disc 307 back to its safe default state.

[0034] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0035] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A valve actuator with high safety performance, comprising a pipeline (1), characterized in that: The top of the pipe (1) is fixedly connected to an actuator housing (2), and a passive safety structure (3) is provided inside the actuator housing (2). The passive safety structure (3) includes a servo motor (301), the output shaft of the servo motor (301) is snapped with a connecting block (3023), a rotating rod (303) is fixedly connected to the outside of the connecting block (3023), a drive gear (304) is fixedly connected to the outside of the rotating rod (303), and a rack (305) is slidably connected to the inner bottom wall of the actuator housing (2).

2. The valve actuator with high safety performance according to claim 1, characterized in that: The rack (305) is provided with teeth on the top and left side, and the top teeth of the rack (305) mesh with the drive gear (304).

3. A valve actuator with high safety performance according to claim 2, characterized in that: The pipe (1) is rotatably connected to a valve disc (307), and a driven gear (306) is fixedly connected to the top of the valve disc (307). The left tooth of the rack (305) meshes with the driven gear (306).

4. A valve actuator with high safety performance according to claim 1, characterized in that: The inner wall of the actuator housing (2) is fixedly connected with a second spring (308). There are two second springs (308), which are fixedly connected to both ends of the rack (305). The inner wall of the actuator housing (2) is fixedly connected with a limit block (309), which is located inside the second spring (308).

5. A valve actuator with high safety performance according to claim 1, characterized in that: An electromagnet (3022) is fixedly connected inside the output shaft of the servo motor (301), and a first spring (3024) is fixedly connected outside the electromagnet (3022). A locking block (3021) is fixedly connected to one end of the first spring (3024).

6. A valve actuator with high safety performance according to claim 5, characterized in that: The connecting block (3023) has a T-shaped slot inside, and the card block (3021) is engaged inside the T-shaped slot. A magnet block is provided inside the card block (3021) on the side near the electromagnet (3022).

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