Part-turn electric actuator

Abstract

The present invention provides a partial rotation electric actuator, including a motor, a primary gear, a secondary gear sheet, an eccentric shaft, a manual worm, a worm gear internal gear, a planetary gear, an output internal gear, an output shaft, an actuator housing, an actuator cover, and an actuator upper cover, characterized in that: the secondary gear sheet is installed on the large diameter end of the eccentric shaft, the worm gear internal gear is installed in the large diameter end of the eccentric shaft, the planetary gear is installed on the small diameter end of the eccentric shaft, the output shaft is installed on the output internal gear and passes through the shaft hole of the eccentric shaft, the output internal gear is installed in the actuator housing, the manual worm passes through the worm hole of the actuator housing, and the actuator upper cover is installed on the actuator housing. The advantages of the present invention are: simple structure, convenient parts processing; a large number of meshing teeth during gear transmission, greatly increased gear life; the use of internal gear transmission, a very high reduction ratio can be achieved with very few gears, and the output torque is also correspondingly improved.

Description

Technical Field

[0001] The present invention relates to the field of valves, and in particular to an electric valve actuator. Background Art

[0002] An electric actuator is an electric mechanism that controls the opening and closing of a valve by receiving an electrical signal from a control unit, thereby controlling the flow rate in a pipeline. There are two types of electric actuators: partial-turn and multi-turn. Structurally, an electric actuator consists of two parts: one is the electrical part, which is mainly composed of electrical appliances such as motors, capacitors, micro switches, cams, heating resistors, and control circuit boards. The other part is the mechanical part, which is mainly composed of bearings, gears, worm wheels, and worms.

[0003] Some rotary electric actuators on the market use external gear meshing reduction mechanisms. Due to the small number of external gear meshing teeth, each meshing tooth bears relatively more force under a certain force, resulting in a shorter gear life and low output torque. At the same time, the external gear meshing torque must be transmitted to the worm, which drives the output worm wheel to rotate. The worm is the core component of manual operation, so when the actuator is electric, manual operation is not allowed and cannot be performed, which will bring a lot of inconvenience in on-site working conditions. Summary of the invention

[0004] In order to solve the problems existing in the existing part-turn electric actuator, the present invention adopts a part-turn electric actuator to solve the problems of short gear life, low force transmission efficiency and the actuator being unable to be manually operated when the power is on.

[0005] The technical solution adopted by the present invention is as follows: a partial rotation electric actuator, including a motor, a primary gear, a secondary gear plate, an eccentric shaft, a manual worm, a worm wheel internal gear, a planetary gear, an output internal gear, an output shaft, a large bearing, a small bearing, an actuator housing, an actuator cover plate, an actuator upper cover, a micro switch, a cam, a capacitor, the secondary gear plate is installed on the large diameter end of the eccentric shaft, a large bearing is provided in the shaft hole of the worm wheel internal gear, the worm wheel internal gear loaded with the large bearing is installed in the large diameter end of the eccentric shaft, a small bearing is provided in the shaft hole of the planetary gear and is installed on the small diameter end of the eccentric shaft, the output shaft is installed on the output internal gear and passes through the shaft hole of the eccentric shaft, the output internal gear is installed in the actuator housing, the manual worm passes through the worm hole of the actuator housing, and cooperates with the worm wheel of the worm wheel internal gear. A primary gear is installed on the output shaft of the motor, the motor is fixed on the actuator cover, the actuator cover is installed on the actuator box, and the primary gear is meshed with the secondary gear sheet. The capacitor is installed on the actuator cover, and the cam passes through the output shaft and is installed on the actuator cover. It is locked with the output shaft through the top screw to form a whole. A micro switch is provided next to the cam to cooperate with it to control the on and off of the actuator circuit, and an actuator cover is installed on the actuator box.

[0006] Preferably, the axis center of the large diameter end of the eccentric shaft does not coincide with the axis center line of the small diameter end.

[0007] Preferably, the external teeth of the worm gear internal gear and the manual worm form a worm gear structure.

[0008] Preferably, the upper half of the teeth of the planetary gear meshes with the internal teeth of the worm gear internal gear, and the lower half meshes with the internal teeth of the output internal gear.

[0009] Preferably, the number of internal teeth of the worm gear internal gear differs from the number of internal teeth of the output internal gear by 1, so that the output internal gear rotates 1 tooth when the worm gear internal gear rotates one circle.

[0010] The advantages of the present invention are: simple structure and convenient parts processing; a large number of meshing teeth during gear transmission, which greatly increases the gear life; the use of internal gear transmission can achieve a very high reduction ratio with a small number of gears, the reduction ratio is greatly improved, and the output torque is also correspondingly improved; when the actuator is electrically driven, the manual worm will not passively participate in the rotation, and at the same time, the manual worm can be manually operated to assist the operation of the actuator, so that the valve can be opened and closed faster or slower. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of the present invention.

[0012] The serial numbers in the figure represent the names: 1. Motor 2. Primary gear 3. Secondary gear piece 4. Eccentric shaft 5. Large bearing 6. Manual worm 7. Worm gear internal gear 8. Planetary gear 9. Small bearing 10. Output internal gear 11. Output shaft 12. Actuator housing 13. Actuator cover 14. Actuator upper cover 15 Micro switch 16 Cam 17 Capacitor. DETAILED DESCRIPTION

[0013] In order to make the purpose and technical solution of the present invention more clear, the present invention is further described below with reference to the accompanying drawings.

[0014] A partial-rotation electric actuator comprises a motor 1, a primary gear 2, a secondary gear piece 3, an eccentric shaft 4, a large bearing 5, a manual worm 6, a worm gear internal gear 7, a planetary gear 8, a small bearing 9, an output internal gear 10, an output shaft 11, an actuator housing 12, an actuator cover plate 13, an actuator upper cover 14, a micro switch 15, a cam 16, and a capacitor 17. The secondary gear piece 3 is mounted on the large-diameter end of the eccentric shaft 4, and this component is defined as component No. 1; the large bearing 5 is mounted in the shaft hole of the worm gear internal gear 7, and the worm gear internal gear 7 with the large bearing 5 mounted thereon is installed from the small-diameter end of the eccentric shaft 4 of component No. 1 to the large-diameter end, and the overall definition is It is component No. 2; small bearing 9 is installed in the shaft hole of planetary gear 8, and this component is defined as component No. 3. Component No. 3 is installed in the small diameter end of eccentric shaft 4 of component No. 2, and the upper half of the teeth of planetary gear 8 meshes with the internal teeth of worm gear internal gear 7, and the whole is defined as component No. 4; output shaft 11 is installed on output internal gear 10, passes through the shaft hole of eccentric shaft 4 of component No. 4, and the lower half of the teeth of planetary gear 8 meshes with the internal teeth of output internal gear 10, and the whole is defined as component No. 5. Component No. 5 is installed in actuator housing 12, and manual worm 6 passes through the worm hole of actuator housing 12 and matches with the worm wheel of worm gear internal gear 7. A primary gear 2 is installed on the output shaft of motor 1, and this component is defined as component No. 6. Component No. 6 is fixed on actuator cover 13, and actuator cover 13 is installed on actuator housing 12, and primary gear 2 meshes with secondary gear sheet 3.

[0015] Furthermore, the capacitor 17 is installed on the actuator cover 13, the cam 16 passes through the output shaft 11 and is installed on the actuator cover 13, and is locked with the output shaft 11 by a top screw to form a whole. A micro switch 15 is provided next to the cam 16 to cooperate with it to control the on and off of the actuator circuit, and an actuator cover 14 is installed on the actuator box 12.

[0016] Furthermore, when the valve is working, the external power supply supplies power to the motor 1, the motor 1 drives the first-stage gear 2 to rotate, the first-stage gear 2 drives the second-stage gear plate 3 and the eccentric shaft 4 to rotate together, and the rotation of the eccentric shaft 4 drives the planetary gear 8 to move eccentrically. Since the upper half of the teeth of the planetary gear 8 are meshed with the internal teeth of the worm gear internal gear 7, and the lower half is meshed with the internal teeth of the output internal gear 10, the planetary gear 8 will simultaneously drive the worm gear internal gear 7 and the output internal gear 10 to move together. Since the worm gear structure has a self-locking function, the worm gear internal gear 7 will not rotate when the planetary gear 8 rotates, and the planetary gear 8 can only drive the output internal gear 10 and the output shaft 11 to rotate. The rotation of the output shaft 11 drives the cam 16 to rotate, and the cam 16 touches the micro switch 15 to control the on-off of the actuator circuit, thereby controlling the operation of the actuator and the opening and closing of the valve.

[0017] Furthermore, the number of internal teeth of the worm gear internal gear 7 differs from the number of internal teeth of the output internal gear 10 by 1, so that when the worm gear internal gear 7 rotates one circle, the output internal gear 10 rotates only one tooth, thereby achieving a large reduction ratio and a large transmission torque.

[0018] Furthermore, since the worm gear structure has a self-locking function, in on-site working conditions, if the valve needs to be opened and closed slowly or quickly, the worker can manually crank the manual worm 6 while the actuator is powered on, so that the manual worm 6 drives the worm gear internal gear 7 to rotate clockwise or counterclockwise, thereby speeding up or slowing down the rotation of the planetary gear 8, affecting the rotation speed of the output internal gear 10 and the output shaft 11, thereby affecting the slow or fast opening and closing of the valve.

Claims

1. A part-rotation electric actuator, comprising a motor (1), a first-stage gear (2), a second-stage gear plate (3), an eccentric shaft (4), a large bearing (5), a manual worm (6), a worm gear internal gear (7), a planetary gear (8), a small bearing (9), an output internal gear (10), an output shaft (11), an actuator housing (12), an actuator cover plate (13), an actuator upper cover (14), a micro switch (15), a cam (16), and a capacitor (17). Features: The secondary gear piece (3) is mounted on the large diameter end of the eccentric shaft (4), a large bearing (5) is provided in the shaft hole of the worm gear internal gear (7), the worm gear internal gear (7) installed with the large bearing (5) is installed in the large diameter end of the eccentric shaft (4), a small bearing (9) is provided in the shaft hole of the planetary gear (8), and is installed on the small diameter end of the eccentric shaft (4), an output shaft (11) is mounted on the output internal gear (10) and passes through the shaft hole of the eccentric shaft (4), the output internal gear (10) is installed in the actuator housing (12), a manual worm (6) passes through the worm hole of the actuator housing (12), and cooperates with the worm of the worm gear internal gear (7), and the motor (1) A first-stage gear (2) is installed on the output shaft, the motor (1) is fixed on the actuator cover (13), the actuator cover (13) is installed on the actuator housing (12), and the first-stage gear (2) is meshed with the second-stage gear plate (3). The capacitor (17) is installed on the actuator cover (13). The cam (16) passes through the output shaft (11) and is installed on the actuator cover (13). It is locked with the output shaft (11) to form a whole. A micro switch (15) is provided next to the cam (16) to cooperate with it to control the on and off of the actuator circuit. An actuator upper cover (14) is installed on the actuator housing (12).

2. A part-turn electric actuator according to claim 1, Features: The axis center of the large diameter end of the eccentric shaft (4) does not coincide with the axis center line of the small diameter end.

3. A part-turn electric actuator according to claim 1, Features: The upper half of the teeth of the planetary gear (8) meshes with the internal teeth of the worm gear internal gear (7), and the lower half meshes with the internal teeth of the output internal gear (10).

4. A part-turn electric actuator according to claim 1, Features: The number of internal teeth of the worm gear internal gear (7) differs from the number of internal teeth of the output internal gear (10) by one.

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