Micro valve electric actuator

Abstract

The utility model discloses a micro valve electric actuator which comprises a shell, a driving motor fixed in the shell, an output shaft rotationally arranged in the shell, and a planetary gear reducing mechanism connected with the driving motor and the output shaft. The planetary gear speed reducing mechanism comprises a planet carrier, a first inner gear ring, a second inner gear ring, a sun gear and a plurality of duplex planetary gears. And the planet carrier is rotationally supported on the output shaft. The multiple duplex planet gears are rotationally connected to the planet carrier, and each duplex planet gear comprises a small planet gear and a large planet gear which are sequentially and coaxially fixed in the direction from the output shaft to the driving motor. The first inner gear ring is fixedly connected with the output shaft and meshed with the small planetary gears. And the second inner gear ring is meshed with each large planetary gear. And the sun gear is connected with a motor output shaft of the driving motor and is meshed with the major planetary gears. The electric actuator is compact in structure, less in required parts and smaller in overall size, and overall miniaturization and light weight of the electric actuator can be achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of electric actuators, in particular to a micro valve electric actuator. Background Art

[0002] Electric valves are an important device in industrial automation control systems. They can accurately adjust and control the flow and pressure of fluids, thereby ensuring the stability and efficiency of industrial production processes. The core component of electric valves is the actuator, which can convert electrical signals into mechanical motion to control the opening and closing of the valve. The core components of electric actuators are motors and reducers. When the electric drive motor starts, it drives the reducer to transfer power to the valve body, causing the valve body to open or close.

[0003] Planetary gear reducers are widely used, and primary planetary transmission or secondary planetary transmission accounts for a high proportion. For example, the Chinese utility model patent with announcement number CN203671972U discloses a solar pipeline emptying device, which is provided with an emptying valve installed in the solar hot water pipeline, which includes a controller for controlling the opening and closing of the emptying valve, and the controller includes a reduction box housing, and the reduction box housing is equipped with a primary planetary gear reduction mechanism, a secondary planetary gear reduction mechanism, an input shaft connected to the motor, and an output shaft connected to the emptying valve in the solar hot water pipeline, the primary planetary gear reduction mechanism is sleeved on the input shaft, the primary planetary gear reduction mechanism includes a primary planetary gear, a primary ring gear, a primary planet carrier and a primary sun gear sleeved on the input shaft, the primary ring gear is fixedly connected to the reduction box housing, the secondary planetary gear reduction mechanism includes an intermediate transmission shaft, a secondary sun gear sleeved on the intermediate transmission shaft, a secondary planetary gear, a secondary ring gear and a secondary planet carrier, the secondary planet carrier is fixedly connected to the reduction box housing, the intermediate transmission shaft is fixedly installed at the center of the primary planet carrier, and the secondary ring gear is connected to the output shaft through a connecting turntable. Traditional two-stage planetary transmission involves many spare parts, the structural design is relatively complex, the usage ratio is relatively small, and the planetary carrier is mostly a single part, resulting in many parts, a large overall structure, and not compact enough, which is not conducive to the overall miniaturization and lightweight of the electric actuator. Utility Model Content

[0004] The utility model aims to provide an external micro valve electric actuator to solve the technical problems of the traditional two-stage planetary transmission actuator having more parts, a larger overall structure, a more complex structure and not compact enough.

[0005] In order to achieve the above-mentioned purpose, the technical solution proposed by the utility model is:

[0006] A micro valve electric actuator, comprising: a housing, a driving motor fixed in the housing, an output shaft rotatably arranged in the housing, and a planetary gear reduction mechanism connecting the driving motor and the output shaft. The planetary gear reduction mechanism comprises: a planet carrier, a first inner gear ring, a second inner gear ring, a sun gear and a plurality of double-linked planetary gears. The planet carrier is rotatably supported on the output shaft. A plurality of double-linked planetary gears are rotatably connected to the planet carrier, and the double-linked planetary gears comprise small planetary gears and large planetary gears coaxially fixed in sequence from the output shaft to the driving motor. The first inner gear ring is fixedly connected to the output shaft and meshes with each small planetary gear. The second inner gear ring meshes with each large planetary gear. The sun gear is connected to the motor output shaft of the driving motor and meshes with each large planetary gear.

[0007] Preferably, the planet carrier includes: a retaining frame, a support ring, a plurality of T-shaped guide shafts, a plurality of first bearings and a plurality of shaft retaining rings. The retaining frame is rotatably supported on the output shaft, and a plurality of circumferentially arranged step holes are provided on one end face of the retaining frame. The support ring is fixed on the other end face of the retaining frame and is provided with a plurality of circumferentially arranged sockets. One end of the T-shaped guide shaft is limited in the step hole, and the other end is inserted into the socket through the step hole. A first bearing is assembled on the T-shaped guide shaft between the retaining frame and the support ring, and the first bearing is used to assemble the duplex planetary gear. A shaft retaining ring is clamped on each T-shaped guide shaft for axially limiting the first bearing and the T-shaped guide shaft.

[0008] Preferably, a flange is mounted and fixed on the output shaft, the first inner gear ring is fixedly connected to the output shaft via the flange, and the planet carrier and the sun gear are both rotatably supported on the output shaft.

[0009] Preferably, the sun gear is connected to the motor output shaft of the drive motor through a check valve.

[0010] Preferably, a switch position display ring is sleeved and fixed on the first inner gear ring, and the outer shell is provided with a transparent window that cooperates with the switch position display ring.

[0011] Preferably, the driving motor has a manual input shaft coaxially connected to the motor output shaft, the manual input shaft extends out of the housing to connect to the handwheel, and the housing is equipped with a protective cover covering the handwheel.

[0012] Preferably, a drive controller is fixed in the housing, and the drive controller is electrically connected to the drive motor.

[0013] Preferably, a plastic gear is fixed on the output shaft, an encoder feedback mechanism matched with the plastic gear is fixed in the housing, and the encoder feedback mechanism is electrically connected to the drive controller.

[0014] Preferably, the housing includes an outer cover with two open ends, a base mounted at the open end of the outer cover, a transparent window sealed between the base and the outer cover, an upper cover sealed at the open end of the outer cover, and a bracket fixedly connected to the inner side of the base. The base is provided with an output shaft hole, and the output shaft is rotatably supported in the output shaft hole through a second bearing. The upper cover is provided with an input shaft hole, and the manual input shaft extends out of the input shaft hole. The second inner gear ring is fixed to the end face of the bracket facing the base, the drive motor is fixed to the end face of the bracket facing the upper cover, and the encoder feedback mechanism is fixed to the side of the bracket. The drive controller is fixed to the inner side of the upper cover.

[0015] Preferably, the outer cover has an opening on the side, and is equipped with a side cover which seals the opening and is used for cable connection, and a plurality of plugs are provided on the side cover.

[0016] Preferably, a first oil seal is installed between the output shaft hole and the output shaft, and a second oil seal is installed between the input shaft hole and the manual input shaft.

[0017] By adopting the above technical scheme, the beneficial effects of the utility model are as follows: the micro valve electric actuator of the utility model adopts a two-stage planetary gear reduction mechanism, which can more finely control the rotation position of the output shaft compared to the one-stage planetary transmission mechanism, and thus can more accurately control the opening and closing angles of the valve. Compared with the traditional two-stage planetary transmission mechanism, its connection and assembly are simpler and more compact, requiring fewer and more streamlined parts, and the overall size is smaller, which is conducive to the overall miniaturization and lightweight of the electric actuator. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional structural schematic diagram of a micro valve electric actuator according to a preferred embodiment of the utility model.

[0019] Figure 2 for Figure 1 Schematic diagram of the explosion structure.

[0020] Figure 3 for Figure 1 Half-section diagram.

[0021] Figure 4 for Figure 1 Schematic diagram of the main view of the planetary gear reduction mechanism of the medium and micro valve electric actuator.

[0022] Figure 5 for Figure 4 Schematic diagram of the top view of the planetary gear reduction mechanism.

[0023] Figure 6 for Figure 4 Schematic diagram of the exploded structure of the planetary gear reduction mechanism.

[0024] Figure 7 for Figure 4 Half-section schematic diagram of the planetary gear reduction mechanism.

[0025] Among them: 1. housing, 2. drive motor, 3. output shaft, 4. planet carrier, 5. double planetary gear, 6. small planetary gear, 7. large planetary gear, 8. first inner ring gear, 9. second inner ring gear, 10. sun gear, 11. motor output shaft, 12. cage, 13. step hole, 14. support ring, 15. jack, 16. T-type guide shaft, 17. first bearing, 18. shaft retaining ring, 19. flange, 20. check valve, 21. switch position display ring, 22. transparent window, 23. manual input shaft, 24. handwheel, 25. protective cover, 26. drive controller, 27. plastic gear, 28. encoder feedback mechanism, 29. outer cover, 30. base, 31. upper cover, 32. bracket, 33. second bearing, 34. third bearing, 35. side cover, 36. plug, 37. first oil seal, 38. second oil seal. DETAILED DESCRIPTION

[0026] The utility model is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0027] like Figure 1 to Figure 7 As shown, the micro valve electric actuator of this embodiment includes a housing 1 and a drive motor 2 installed in the housing 1, an output shaft 3, a planetary gear reduction mechanism, a check valve 20, a switch position display ring 21, a drive controller 26, a plastic gear 27 and an encoder feedback mechanism 28.

[0028] The housing 1 includes an outer cover 29, a base 30, an upper cover 31, a bracket 32, a transparent window 22 and a side cover 35. The outer cover 29 is open at both ends, the base 30 is assembled at one end of the outer cover 29 by screws, the transparent window 22 is clamped and fixed between the outer cover 29 and the base 30, and sealing rings are arranged between the transparent window 22, the base 30 and the outer cover 29. The side of the outer cover 29 is open and a side cover 35 is assembled by screws to seal the opening. A sealing ring is arranged between the side cover 35 and the outer cover 29, and the side cover 35 is provided with a plurality of plugs 36. When actually used, the plugs 36 can be removed as needed to install the waterproof joint. The upper cover 31 is assembled at the other end of the outer cover 29 by screws, and a sealing ring is arranged between the outer cover 29 and the upper cover 31. The bracket 32 ​​is assembled on the inner side of the base 30 by screws. The base 30 is provided with an output shaft hole, and the upper cover 31 is provided with an input shaft hole. The housing 1 of this embodiment facilitates the assembly of various components inside it, and has good sealing performance and is waterproof and dustproof.

[0029] The output shaft 3 is rotatably supported in the output shaft hole by the second bearing 33. The output shaft 3 is sleeved with a first oil seal 37 for sealing the gap between the output shaft hole and the output shaft 3. The output shaft 3 is sleeved with a flange 19 located on the inner side of the base 30.

[0030] The planetary gear reduction mechanism includes a planet carrier 4, a first inner gear ring 8, a second inner gear ring 9, a sun gear 10 and a plurality of double-linked planetary gears 5. The first inner gear ring 8 is mounted on the output shaft 3 and fixedly connected to the flange 19 by screws to realize the synchronous rotation of the first inner gear ring 8 and the output shaft 3. The planet carrier 4 is rotatably supported on the output shaft 3, and three circumferentially arranged double-linked planetary gears 5 are arranged on the planet carrier 4. The double-linked planetary gears 5 include small planetary gears 6 and large planetary gears 7 that are integrally formed and coaxially connected. The three small planetary gears 6 are all meshed with the first inner gear ring 8. The second inner gear ring 9 is mounted on the output shaft 3 and fixed to the end surface of the bracket 32 ​​facing the base 30 by screws, and the second inner gear ring 9 is meshed with the three large planetary gears 7. The sun gear 10 is rotatably supported on the output shaft 3 by the third bearing 34, and the sun gear 10 is meshed with the three large planetary gears 7. The drive motor 2 is fixed on the end face of the bracket 32 ​​facing the upper cover 31. The drive motor 2 has a motor output shaft 11 and a manual input shaft 23 connected coaxially. The motor output shaft 11 is connected to the sun gear 10 through the check valve 20, and the manual input shaft 23 extends out of the input shaft hole and is connected to the handwheel 24. The handwheel 24 can be used to manually control the opening and closing of the valve in the event of power failure. In order to avoid accidental contact affecting the accuracy of the opening and closing of the valve, a detachable protective cover 25 is provided on the housing 1 to protect the handwheel 24. In order to improve the sealing performance, a second oil seal 38 is mounted on the manual input shaft 23 to seal the gap between the input shaft hole and the manual input shaft 23.

[0031] In order to facilitate assembly, the planet carrier 4 of this embodiment includes a retainer 12, a support ring 14, three T-shaped guide shafts 16, six first bearings 17 and three shaft retaining rings 18. The retainer 12 is rotatably supported on the output shaft 3, and the retainer 12 is provided with three circumferentially arranged step holes 13 from one end face thereof. The support ring 14 is fixed to the other end face of the retainer 12 and is provided with three circumferentially arranged insertion holes 15. The T-shaped guide shaft 16 passes through the step hole 13 from the side of one end of the retainer 12 to the other end of the T-shaped guide shaft 16 and is axially limited in the step hole 13, the two first bearings 17 are assembled on the T-shaped guide shaft 16 and are clamped and limited by the shaft retaining ring 18, and the T-shaped guide shaft 16 is also axially limited, and after the insertion hole 15 is aligned with the T-shaped guide shaft 16, the support ring 14 is fixed to the other end face of the retainer 12 with screws, so that the two ends of the T-shaped guide shaft 16 are supported on the retainer 12 and the support ring 14 respectively.

[0032] The switch position display ring 21 is fixed on the first inner gear ring 8 by a plunger inserted radially into the flange 19, and rotates synchronously with the first inner gear ring 8. The outer surface of the switch position display ring 21 is engraved with OPEN and CLOSE marks along the circumferential direction. The switch position display ring 21 faces the transparent window 22. By observing the switch position display ring 21 through the transparent window 22, the switch state of the valve can be intuitively understood.

[0033] The plastic gear 27 is coaxially fixed on the output shaft 3, and the encoder feedback mechanism 28 is fixed on the side of the bracket 32. The encoder feedback mechanism 28 feeds back the position angle speed through the plastic gear 27. The drive controller 26 is fixed on the inner side of the upper cover 31, and is electrically connected to the drive motor 2 and the encoder feedback mechanism 28. The electric actuator of this embodiment can be assembled in a modular manner. The base 30, the output shaft 3, the plastic gear 27, the switch position display ring 21, the first inner gear ring 8, the planet carrier 4, the double planetary gear 5 and the sun gear 10 can be used as an assembly module, the bracket 32, the second inner gear ring 9, the encoder feedback mechanism 28, the drive motor 2 and the check valve 20 can be used as an assembly module, and the drive controller 26 and the upper cover 31 can be used as an assembly module. The various assembly modules are assembled first and then the subsequent overall assembly is performed to reduce the difficulty of assembly and improve the assembly efficiency.

[0034] The micro valve electric actuator of this embodiment controls the operation of the drive motor 2 through the drive controller 26. The drive motor 2 drives the sun gear 10 to rotate, and the sun gear 10 drives the large planetary gear 7 to rotate. At the same time, the small planetary gear 6 drives the first inner ring 8 to rotate. The first inner ring 8 is fixed on the output shaft 3. The output shaft 3 rotates at the same time. The output shaft 3 is used to connect with the valve to control the opening and closing of the valve. Compared with the traditional two-stage planetary transmission mechanism, the micro valve electric actuator of this embodiment omits the setting of the secondary sun gear, the intermediate transmission shaft, the secondary planetary carrier, etc., and has a more compact and streamlined structure and a smaller overall volume, which is conducive to realizing the overall miniaturization and lightweight of the electric actuator.

[0035] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, those skilled in the art should understand that various changes in form and details of the present invention are within the scope of protection of the present invention without departing from the spirit and scope of the present invention as defined in the appended claims.

Claims

1. A micro valve electric actuator, characterized in that: include: A housing (1), a driving motor (2) fixed in the housing (1), an output shaft (3) rotatably arranged in the housing (1), and a planetary gear reduction mechanism connecting the driving motor (2) and the output shaft (3); The planetary gear reduction mechanism comprises: A planet carrier (4) rotatably supported on the output shaft (3); A plurality of double planetary gears (5) are rotatably connected to the planet carrier (4), wherein the double planetary gears (5) include a small planetary gear (6) and a large planetary gear (7) which are coaxially fixed in sequence from the output shaft (3) to the drive motor (2); A first internal gear ring (8) fixedly connected to the output shaft (3) and meshing with each of the planetary gears (6); A second inner gear ring (9) meshing with each of the large planetary gears (7); The sun gear (10) is connected to the motor output shaft (11) of the drive motor (2) and meshes with each of the large planetary gears (7).

2. The micro valve electric actuator according to claim 1, characterized in that: The planet carrier (4) comprises: A retainer (12) is rotatably supported on the output shaft (3), and the retainer (12) is provided with a plurality of circumferentially arranged step holes (13) on one end surface thereof; A support ring (14) is fixed to the other end surface of the retaining frame (12) and is provided with a plurality of circumferentially arranged insertion holes (15); A plurality of T-shaped guide shafts (16), one end of each of the T-shaped guide shafts (16) being limited in the step hole (13) and the other end of each of the T-shaped guide shafts (16) passing through the step hole (13) and inserted into the insertion hole (15); a plurality of first bearings (17) mounted on the T-shaped guide shaft (16) between the retaining frame (12) and the support ring (14), the first bearings (17) being used to assemble the double-linked planetary gear (5); A plurality of shaft retaining rings (18) are clamped on the T-shaped guide shaft (16) and are used to axially limit the first bearing (17) and the T-shaped guide shaft (16).

3. The micro valve electric actuator according to claim 1, characterized in that: A flange (19) is fixedly mounted on the output shaft (3), the first internal gear ring (8) is fixedly connected to the output shaft (3) via the flange (19), and the planet carrier (4) and the sun gear (10) are both rotatably supported on the output shaft (3).

4. The micro valve electric actuator according to claim 1, characterized in that: The sun gear (10) is connected to the motor output shaft (11) of the drive motor (2) via a backflow prevention device (20).

5. The micro valve electric actuator according to any one of claims 1 to 4, characterized in that: A switch position display ring (21) is sleeved and fixed on the first inner gear ring (8), and the outer shell (1) is provided with a transparent window (22) that cooperates with the switch position display ring (21).

6. The micro valve electric actuator according to claim 5, characterized in that: The drive motor (2) has a manual input shaft (23) coaxially connected to the motor output shaft (11); the manual input shaft (23) extends out of the housing (1) to connect to a hand wheel (24); and the housing (1) is equipped with a protective cover (25) for covering the hand wheel (24).

7. The micro valve electric actuator according to claim 6, characterized in that: It also includes a drive controller (26) fixed in the housing (1), wherein the drive controller (26) is electrically connected to the drive motor (2).

8. The micro valve electric actuator according to claim 7, characterized in that: It also includes a plastic gear (27) and an encoder feedback mechanism (28) that cooperates with the plastic gear (27), wherein the plastic gear (27) is coaxially fixed on the output shaft (3), and the encoder feedback mechanism (28) is fixed in the housing (1) and is electrically connected to the drive controller (26).

9. The micro valve electric actuator according to claim 8, characterized in that: The housing (1) comprises an outer cover (29) with two open ends, a base (30) mounted on the open end of the outer cover (29), a transparent window (22) sealed between the base (30) and the outer cover (29), an upper cover (31) sealed on the open end of the outer cover (29), and a bracket (32) fixedly connected to the inner side of the base (30); The base (30) is provided with an output shaft hole, and the output shaft (3) is rotatably supported in the output shaft hole via a second bearing (33); the upper cover (31) is provided with an input shaft hole, and the manual input shaft (23) extends out of the input shaft hole; the second inner gear ring (9) is fixed to an end surface of the bracket (32) facing the base (30), the drive motor (2) is fixed to an end surface of the bracket (32) facing the upper cover (31), and the encoder feedback mechanism (28) is fixed to a side surface of the bracket (32); and the drive controller (26) is fixed to the inner side of the upper cover (31).

10. The micro valve electric actuator according to claim 9, characterized in that: The outer cover (29) has a side opening, and the outer cover (29) is equipped with a side cover (35) for sealing the opening and for cable wiring, and the side cover (35) is provided with a plurality of plugs (36); a first oil seal (37) is installed between the output shaft hole and the output shaft (3); and a second oil seal (38) is installed between the input shaft hole and the manual input shaft (23).

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