Spring reset type electric actuator

Abstract

The utility model discloses a spring reset type electric actuator which comprises a shell, the shell is provided with a base and a driving device, the driving device is connected with a valve control mechanism, the valve control mechanism comprises a sector tooth and a rotor, the tooth end of the sector tooth is in tooth connection with a motor output shaft of the driving device, and a clamping hole is formed in the middle of the sector tooth and connected with the upper end of the rotor in a clamped mode. A valve rod mounting hole is formed in the middle of the rotor, the lower end of the sector gear is fixedly connected with two symmetrically-arranged connecting rods, each connecting rod is connected with a reset tension spring in a hung mode, the two reset tension springs are horizontally and obliquely mounted, and the mounting directions are opposite. The sector gear and the rotor are matched for transmission opening of the valve, the reset tension spring is adopted for automatic reset closing of the valve, it is ensured that the valve can be kept in the opening or closing state, meanwhile, manual, electric and reset switching without a clutch can be achieved, switching is convenient, free of disturbance, simple and safe, the tension spring is adopted for reset, the structure is simple, and cost is low. And maintenance and overhaul are easy.

Description

Technical Field

[0001] The utility model belongs to the technical field of electric actuators, and in particular relates to a spring-reset electric actuator. Background Art

[0002] An electric actuator is a driving device that can provide linear or rotary motion. It controls the opening and closing of the valve body by moving the output shaft of the actuator up and down. The electric actuator is an indispensable and important component of the automatic control system. In order to cope with emergencies, existing electric actuators are beginning to be equipped with manual actuators and reset actuators. In the event of an emergency such as a power outage or when the power source is cut off for some reason, the valve body can be opened or closed quickly by manual control or automatic reset.

[0003] The existing electric actuator uses a clutch to switch between the manual actuator and the electric actuator, which is inconvenient and complicated to operate. The additional clutch increases the product cost, which is not conducive to the popularization of electric actuators with manual actuators. Most of the reset execution units of existing electric actuators use worm spring energy storage reset. Due to the limitation of the manufacturing process, the worm spring energy storage has a small reset torque and cannot be used in high reset torque scenarios.

[0004] Therefore, a spring-reset electric actuator is needed to solve the technical problems in the prior art of using a clutch to switch between manual execution and electric execution, which is inconvenient and complicated to operate, and the reset execution unit uses a spiral spring energy storage reset, which has a small torque. Utility Model Content

[0005] The purpose of the utility model is to provide a spring-return electric actuator to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a spring-reset electric actuator, with a valve connected at the bottom, the actuator comprising a shell, the shell being provided with a base, a driving device being provided in the shell, the driving device being connected to a valve control mechanism, the valve control mechanism comprising fan teeth and a rotor, the tooth ends of the fan teeth being gear-engaged with the motor output shaft of the driving device, a clamping hole being provided in the middle for clamping with the upper end of the rotor, a valve stem mounting hole being provided in the middle of the rotor, the shape and size of the valve stem mounting hole matching the valve stem of the valve, two symmetrically arranged connecting rods being fixedly connected to the lower end of the fan teeth, each of the connecting rods being provided with a hanging interface, the hanging interfaces of the two connecting rods facing opposite directions, each of which is hung with a reset tension spring, and the two reset tension springs are horizontally and obliquely installed with opposite installation directions.

[0007] Furthermore, the driving device is a hysteresis synchronous motor, which is mounted on a motor mounting seat. The motor mounting seat is provided with legs and is mounted on the base. The motor output shaft of the driving device passes through the motor mounting seat and is connected to the valve control mechanism.

[0008] Furthermore, the shell also includes an outer shell, which covers the base up and down to form a cavity, and the drive device and the valve control mechanism are installed in the cavity; the base is U-shaped, and hanging rings are provided on the inner sides of two relative U-shaped surfaces, and the other ends of the two reset springs are hung on the two inner hanging rings of the base in opposite directions.

[0009] Furthermore, the rotor is installed at the bottom of the base through a rotor seat, the interior of the rotor seat is a through hole, the rotor is rotatably installed inside the rotor seat, and the rotor seat passes through the base and is clamped with the valve.

[0010] Furthermore, a manual switch is sleeved on the rotor, and a limiting groove is provided on one side of the base. The manual switch is in the shape of a flat strip, one end of which is a circular ring sleeved on the rotor, and the other end is a flat rectangular block passing through the limiting groove and suspended on the outside of the base, and the limiting groove is in the shape of an inverted L.

[0011] Furthermore, a limit block is provided on the lower end surface of the motor mounting seat.

[0012] Furthermore, a valve mounting slide plate is provided on the base, and the slide plate is a flat plate. A sliding hole is provided on the side of the base, and the slide plate passes through the sliding hole and slides under the limit of the sliding hole; a sliding groove is provided in the middle of the slide plate, and the sliding groove is an inverted V-shape, which is wider in the front and narrower in the back. There is a protrusion on the valve, and the protrusion is provided with grooves on both sides. After the valve is installed, the slide plate is pulled out, and the rear part of the sliding groove will be stuck in the groove.

[0013] Furthermore, a vertical rod is provided at the front end of the slide slot, and the vertical rod is connected to a disassembly tension spring, and one end of the disassembly tension spring is hung on the inner side of the base.

[0014] Compared with the prior art, the spring return electric actuator provided by the utility model has at least the following beneficial effects:

[0015] (1) The utility model uses the cooperation of the fan teeth and the rotor to drive the valve to open, and uses the reset spring to automatically reset and close the valve, so as to ensure that the valve can remain in the open or closed state, and can realize manual, electric and reset switching without the need for a clutch, which is convenient, disturbance-free, simple and safe to switch, and uses the spring reset, which has a simple structure and is easy to maintain and repair;

[0016] (2) The utility model provides a slide plate that cooperates with the protrusion on the valve to achieve rapid disassembly and assembly of the valve, greatly improving the convenience of valve maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional structural schematic diagram of the overall structure of the utility model;

[0018] Figure 2 It is a schematic diagram of the disassembly of the utility model;

[0019] Figure 3 It is an exploded schematic diagram of the valve control mechanism;

[0020] Figure 4 It is a schematic diagram of the fan tooth shape;

[0021] Figure 5 This is a schematic diagram of skateboard installation;

[0022] In the figure: 1 shell, 11 housing, 12 base, 121 hanging ring, 122 limiting groove, 123 sliding hole;

[0023] 2 driving device, 21 motor mounting seat, 22 motor output shaft, 23 limit block;

[0024] 3 valve control mechanism, 31 sector teeth, 32 rotor, 33 reset spring, 34 rotor seat, 311 tooth end, 312 clamping hole, 313 connecting rod, 314 hanging interface, 321 valve stem mounting hole.

[0025] 4 valve, 41 valve stem, 42 protrusion, 421 groove;

[0026] 5 manual switch, 6 slide plate, 61 slide slot, 62 vertical rod, 63 disassembly and assembly of tension spring. DETAILED DESCRIPTION

[0027] See also Figure 1-5The utility model provides a spring return electric actuator, including a housing 1, the housing 1 is provided with a base 12, a driving device 2 is provided in the housing 1, the driving device 2 is a hysteresis synchronous motor, the driving device 2 is mounted on a motor mounting seat 21, the motor mounting seat 21 is provided with a support leg, and is mounted on the base 12, the motor output shaft 22 of the driving device 2 passes through the motor mounting seat 21 and is connected to the valve control mechanism 3, the valve control mechanism 3 is installed below the motor mounting seat 21, and includes a sector tooth 31 and a rotor 32, the sector tooth 31 is a flat half gear, the tooth end 311 is gear-connected with the motor output shaft 22 of the driving device 2, and a clamping hole 312 is opened in the middle to be connected with the rotor 32 The rotor 32 is clamped at the end, and a valve stem mounting hole 321 is provided in the middle of the rotor 32. The shape and size of the valve stem mounting hole 321 match the valve stem 41 of the valve 4 below. The valve stem 41 passes through the housing 1 and is inserted into the valve stem mounting hole 321. When the driving device 2 drives the rotor 32 to rotate through the sector teeth 31, the valve stem 41 rotates with the rotor 32 to open or close the valve 4. The lower end of the sector teeth 31 is fixedly connected with two symmetrically arranged connecting rods 313, and each connecting rod 313 is provided with a hanging interface 314. The hanging interfaces 314 of the two connecting rods 313 face opposite directions, and each is hung with a reset tension spring 33. The two reset tension springs 33 are installed horizontally and obliquely, and the installation directions are opposite.

[0028] Further as Figure 1 , 2 As shown, the housing 1 includes a shell 11, and the shell 11 and the base 12 are covered up and down to form a cavity, and the drive device 2 and the valve control mechanism 3 are installed in the cavity. The base 12 is U-shaped, and a hanging ring 121 is provided on the inner sides of two opposite U-shaped surfaces. The other ends of the two reset tension springs 33 are respectively hung on the two inner hanging rings 121 of the base 12 in opposite directions.

[0029] Further as Figure 2 , 3 As shown, the rotor 32 is installed at the bottom of the base 12 through a rotor seat 34 . The rotor seat 34 has a through hole inside. The rotor 32 is rotatably installed inside the rotor seat 34 . The rotor seat 34 passes through the base 12 and is engaged with the valve 4 .

[0030] Further as Figure 2 , 3As shown, a manual switch 5 is also sleeved on the rotor 32, and a limit groove 122 is provided on one side of the base 12. The manual switch 5 is in the shape of a flat strip, one end of which is a circular ring sleeved on the rotor 32, and the other end is a flat rectangular parallelepiped passing through the limit groove 122 and suspended outside the base 12. The limit groove 122 is in the shape of an inverted L, with the long side on the top and the short side on the bottom. When the power is off, the valve 4 can be opened by toggling the manual switch 5. The manual switch 5 slides on the upper part of the limit groove 122, and is pressed down after being dialed to the upper end of the limit groove 122. It can be stuck in the lower short side of the limit groove 122 to keep the valve open. When the valve needs to be closed, the manual switch 5 is pushed up to disengage the lower short side limit of the limit groove 122, and the reset tension spring 33 will pull the fan teeth 31 to drive the rotor 32 to rotate.

[0031] Further as Figure 3 As shown, a limit block 23 is provided on the lower end surface of the motor mounting seat 21. When the sector teeth 31 rotate to open, they hit the limit block 23 and stop rotating, thereby preventing the valve 4 from opening too much.

[0032] Further as Figure 5 As shown, in order to facilitate the rapid disassembly and assembly of the valve body 4, a valve installation slide plate 6 is also provided on the base 12. The slide plate 6 is a flat plate. A slide hole 123 is provided on the side of the base 12. The slide plate 6 passes through the slide hole 123 and can slide under the limit of the slide hole 123. A slide groove 61 is provided in the middle of the slide plate 6. The slide groove 61 is an inverted V-shaped, wide at the front and narrow at the back. There is a protrusion 42 on the valve 4, and grooves 421 on both sides are provided on the protrusion 42. When the valve is to be installed in the actuator, the slide plate 6 is first pushed in until the protrusion 42 is located at the front end of the slide groove 61. After the valve 4 is installed, the slide plate 6 is pulled out, and the rear part of the slide groove 61 is stuck in the groove 421. The protrusion 42 is limited in the slide groove 61, and the installation of the valve is completed. The front end of the slide groove 61 is provided with a vertical rod 62, and the vertical rod 62 is connected with a disassembly spring 63, and one end of the disassembly spring 63 is hung on the inner side of the base 12. When disassembling the valve 4, the slide plate 6 is pushed inward outside the base 12, and the disassembly spring 63 will be stretched. After the protrusion 42 of the valve 4 is inserted into or pulled out of the front end of the slide groove 61, the slide plate 6 is released, and the disassembly spring 63 retracts to drive the slide plate 6 to reset. The front and rear ends of the slide plate 6 are both provided with limit stops.

[0033] This solution has the following working process: when the user needs to open the valve 4, the actuator can be controlled manually or electrically to open it. In the electric mode, the drive device 2 is started, and the motor output shaft 22 drives the fan teeth 31 to rotate, thereby driving the rotor 32 to rotate, and then driving the valve stem 41 inserted in the rotor 32 to rotate, so as to open the valve 4. When the fan teeth 31 rotate, the reset spring 33 is stretched. After the drive device 2 is closed, the reset spring 33 retracts to drive the fan teeth 31 to rotate, and the rotor 32 drives the valve stem 41 to rotate so that the valve 4 is closed. In the manual mode, by toggling the manual switch 5, the rotor 32 is driven to rotate, thereby opening the valve 4. The manual switch 5 is stuck in the lower part of the limit slot 122 to keep the valve open. After the manual switch 5 is separated from the lower part of the limit slot 122, the reset spring 33 retracts to drive the valve 4 to close.

[0034] When maintenance is required, the protrusion 42 on the valve 4 can be inserted into or out of the slide groove 61 by pushing the slide plate 6, so as to realize the rapid disassembly and assembly of the valve 4. After the valve 4 is installed, the slide plate 6 is released, the disassembly and assembly tension spring 63 is retracted, and the groove 421 of the protrusion 42 is inserted into the narrow part of the rear end of the slide groove 61, so that the valve 4 can be fixed.

[0035] The above description is only a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any minor modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the protection scope of the present invention.

Claims

1. A spring return electric actuator with a valve connected below, characterized in that: The actuator comprises a shell, the shell is provided with a base, a driving device is arranged in the shell, the driving device is connected to a valve control mechanism, the valve control mechanism comprises a sector tooth and a rotor, the tooth end of the sector tooth is engaged with the motor output shaft of the driving device, a clamping hole is provided in the middle to clamp with the upper end of the rotor, a valve stem mounting hole is provided in the middle of the rotor, the shape and size of the valve stem mounting hole match the valve stem of the valve, the lower end of the sector tooth is fixedly connected with two symmetrically arranged connecting rods, each of the connecting rods is provided with a hanging interface, the hanging interfaces of the two connecting rods face oppositely, each is hung with a reset tension spring, and the two reset tension springs are horizontally and obliquely installed with opposite installation directions; The base is also provided with a valve installation slide plate, which is a flat plate, and a sliding hole is opened on the side of the base, and the slide plate passes through the sliding hole and slides under the limit of the sliding hole; a slide groove is provided in the middle of the slide plate, and the slide groove is an inverted V-shape, which is wide at the front and narrow at the back. There is a protrusion on the valve, and the protrusion is provided with grooves on both sides. After the valve is installed, the slide plate is pulled out, and the rear part of the slide groove will be stuck in the groove; A vertical rod is arranged at the front end of the slide slot, and the vertical rod is connected with a disassembly and assembly tension spring, and one end of the disassembly and assembly tension spring is hung on the inner side of the base.

2. A spring return electric actuator according to claim 1, characterized in that: The driving device is a hysteresis synchronous motor, which is mounted on a motor mounting seat. The motor mounting seat is provided with legs and is mounted on the base. The motor output shaft of the driving device passes through the motor mounting seat and is connected to the valve control mechanism.

3. A spring return electric actuator according to claim 2, characterized in that: The lower end surface of the motor mounting seat is provided with a limiting block.

4. A spring return electric actuator according to claim 2, characterized in that: The shell also includes an outer shell, which covers the base up and down to form a cavity, and the drive device and the valve control mechanism are installed in the cavity; the base is U-shaped, and hanging rings are provided on the inner sides of two relative U-shaped surfaces, and the other ends of the two reset tension springs are respectively hung on the two inner hanging rings of the base in opposite directions.

5. The spring return electric actuator according to claim 1, characterized in that: The rotor is installed at the bottom of the base through a rotor seat. The rotor seat has a through hole inside. The rotor is rotatably installed inside the rotor seat. The rotor seat passes through the base and is clamped with the valve.

6. A spring return electric actuator according to claim 1, characterized in that: The rotor is also provided with a manual switch, and a limiting groove is provided on one side of the base. The manual switch is in the shape of a flat strip, one end of which is a circular ring provided on the rotor, and the other end is a flat rectangular block passing through the limiting groove and suspended on the outside of the base, and the limiting groove is in the shape of an inverted L.

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