Valve actuating mechanism

Abstract

The valve actuating mechanism comprises a machine body, an inner gear ring A, an inner gear ring B, a planet carrier and a duplex planet wheel are arranged in the machine body, the duplex planet wheel is installed in the planet carrier through a planet wheel shaft and a bearing and can freely rotate, and the inner gear ring A, the inner gear ring B, the duplex planet wheel and the planet carrier form an NN type planet wheel mechanism. A worm pair and an output disc are further arranged in the machine body, the worm pair is composed of a worm, a worm gear and a hand wheel, the worm gear is integrated on the inner gear ring A, the hand wheel is installed on the worm, and the output disc is installed on the inner gear ring B. The utility model further comprises a driving motor which is connected with the planet carrier through a coupler. A multi-stage speed reducing mechanism is replaced by the first-stage NN type planet wheel mechanism, and the mechanism is self-locked when the planet wheel carrier is driven. A worm pair is used for self-locking, a worm gear and an inner gear ring A are integrated, the inner gear ring A is fixed during electric operation, a hand wheel is shaken during manual operation, automatic switching of manual operation and electric operation is achieved, and a self-locking mechanism and a manual operation and electric operation switching device are omitted.

Description

Technical Field

[0001] The utility model belongs to the field of valve actuators, especially an electric valve actuator with self-locking function, and specifically relates to a valve actuator. Background Art

[0002] The existing valve actuators are composed of a multi-stage speed reduction mechanism, a self-locking mechanism and a manual and electric switching mechanism, which causes technical problems such as complex mechanism, many parts, difficult manufacturing and assembly, low efficiency, high cost and large volume of the mechanism. Specifically, the existing actuators on the market use radial flux motors. Due to structural limitations, the motor torque needs to be amplified to the output end through the way of worm and worm gear transmission. The transmission efficiency of the self-locking worm and worm gear is often less than 40%. Not only is the efficiency low, but the worm and worm gear running at high speed will also generate a high temperature rise due to pressure and friction, seriously affecting the service life of the equipment. And a manual and electric switching device is also provided on the existing actuators, increasing the number of parts, manufacturing and assembly difficulties. Content of the Utility Model

[0003] The purpose of the utility model is to provide a valve actuator, which solves the technical problems of how to simplify the existing valve actuator and improve the execution efficiency, and proposes a valve actuator combining an NN type planetary mechanism and a worm gear pair, and changing from radial motor drive to axial motor drive.

[0004] A valve actuator includes a body, in which an internal gear ring A, an internal gear ring B, a planetary gear carrier, a double planetary gear 1 and a double planetary gear 2 coaxially arranged are provided, and an NN type planetary gear mechanism is formed. The internal gear ring A and the internal gear ring B are coaxially arranged. The double planetary gear 1 and the double planetary gear 2 are both installed in the planetary gear carrier through planetary gear shafts and bearings and can rotate freely.

[0005] The body also includes a worm gear pair and an output disk. The worm gear pair includes a worm, a worm wheel meshed with the worm, and a hand wheel. The worm wheel is coaxially integrally connected to the internal gear ring A. The hand wheel is coaxially installed at one end of the worm. The output disk is coaxially installed on the internal gear ring B.

[0006] The planetary gear carrier is connected to the rotor of the drive motor through a coupling.

[0007] The double planetary gear 1 installed on the planetary gear carrier through the planetary gear shaft and bearing meshes with the internal gear ring A to revolve and rotate, and the double planetary gear 1 meshes with the internal gear ring B. The internal gear ring B is connected to the output disk.

[0008] The internal gear ring A, the internal gear ring B, the planetary gear carrier, the double planetary gear 1 and the double planetary gear 2 form a first-stage NN type planetary gear reduction mechanism with the planetary gear carrier as the driving part and the internal gear ring B as the driven part.

[0009] The internal gear ring A, internal gear ring B, planet carrier, double planet gear I and double planet gear II form a first-stage NN-type planetary gear speed increasing mechanism with internal gear ring B as the driver and planet carrier as the follower. This NN-type planetary gear mechanism is self-locking.

[0010] The handwheel is coaxially installed at one end of the worm. The worm drives the internal gear ring A of the integrated worm gear engaged with it to rotate. The internal gear ring A drives the double planet gear I engaged with it to rotate. The double planet gear II drives the internal gear ring B engaged with it to rotate. The internal gear ring B is connected to the output disc.

[0011] A driving motor is further provided on the machine body. The driving motor includes a machine shell installed on the machine body, a stator and a rotor installed in the machine shell. The rotor and the stator are axially installed. The rotor is connected to the planet carrier through a coupling and drives the planet carrier to rotate;

[0012] The middle of the stator and the rotor is hollow, and the screw rod of the valve can pass through the middle.

[0013] The driving motor is an axial flux motor and is coaxially arranged with the output shaft direction of the planet carrier.

[0014] The axial flux motor is a disc motor with axial magnetic field.

[0015] An application of a valve actuator on an actuator product.

[0016] The positive effects of the present utility model are as follows:

[0017] (1) This solution uses an NN-type planetary gear mechanism. When the planet carrier is the follower, the NN-type planetary gear mechanism is self-locking. The original self-locking mechanism is cancelled. The worm gear pair self-locking is used, and the worm gear is integrated on the internal gear ring. The worm gear and the internal gear ring are integrated to realize the manual and electric automatic switching. The manual and electric switching device is cancelled, reducing the number of parts, lowering the manufacturing and assembly difficulty, improving the efficiency, and reducing the cost. The axial motor drive is used instead of the radial motor drive, with a small axial dimension, large torque, reducing the volume of the mechanism, and the middle of the axial motor is hollow and can pass through the valve screw rod mechanism;

[0018] (2) The axial flux motor used in this solution adopts an axial layout. Along the output shaft direction of the actuator, the power transmission does not need to rely on the worm gear structure, and the structure is more compact; and the NN-type planetary gear mechanism of this solution has its own self-locking property and a transmission efficiency of up to 95%, perfectly realizing the manual and automatic switching function required by the valve actuator. At the same time, the structure is compact, and the transmission efficiency is more than twice that of the original solution; at the same time, the transmission method of the NN-type planetary gear mechanism belongs to the gear meshing form, with a long service life and maintenance-free;

[0019] (3) This solution belongs to the electric actuator on the valve, and a disk motor with axial magnetic field is used. The important innovation lies in the application of the combination of the disk motor and the planet on the actuator product. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic structural diagram of the valve actuator in the present utility model.

[0021] Figure 2 It is a schematic structural diagram of the double planetary gear mechanism in the present utility model.

[0022] Figure 3 It is a schematic structural diagram of the valve in the present utility model.

[0023] Among them, the reference numerals in the drawings are: 1, internal gear ring A; 2, internal gear ring B; 21, housing; 22, stator; 23, rotor; 3, planetary gear carrier; 4, double planetary gear one; 5, planetary gear shaft; 6, bearing; 7, worm; 8, handwheel; 9, valve; 91, screw rod; 92, connecting disk; 100, body; 200, driving motor; 300, coupling; 400, output disk. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] In order to more clearly illustrate the technical features of this solution, the following elaborates on this solution through specific embodiments.

[0025] See Figure 1 - Figure 3 , a valve actuator, including a body 100, inside which there are an internal gear ring A 1, an internal gear ring B 2, a planetary gear carrier 3, a double planetary gear one 4 and a double planetary gear two arranged coaxially, and they form an NN-type planetary gear mechanism. The internal gear ring A 1 and the internal gear ring B 2 are arranged coaxially. The double planetary gear one 4 and the double planetary gear two are both installed in the planetary gear carrier 3 through the planetary gear shaft 5 and the bearing 6 and can rotate freely;

[0026] The body 100 also includes a worm gear pair and an output disk 400. The worm gear pair includes a worm 7, a worm wheel meshed with the worm 7, and a handwheel 8. The worm wheel is coaxially integrally connected to the internal gear ring A 1, and the handwheel 8 is coaxially installed at one end of the worm 7. The output disk 400 is coaxially installed on the internal gear ring B 2.

[0027] The planetary gear carrier 3 is connected to the rotor 23 of the driving motor 200 through a coupling 300.

[0028] The double planetary gear one 4 installed on the planetary gear carrier 3 through the planetary gear shaft 5 and the bearing 6 meshes with the internal gear ring A 1 to revolve and rotate, the double planetary gear two meshes with the internal gear ring B 2, and the internal gear ring B 2 is connected to the output disk 400;

[0029] The internal gear ring A1, internal gear ring B2, planet carrier 3, double planetary gear 1 4 and double planetary gear 2 form a first-stage NN-type planetary gear reduction mechanism with the planet carrier 3 as the driving member and the internal gear ring B2 as the driven member.

[0030] The internal gear ring A1, internal gear ring B2, planet carrier 3, double planetary gear 1 4 and double planetary gear 2 form a first-stage NN-type planetary gear speed-increasing mechanism with the internal gear ring B2 as the driving member and the planet carrier 3 as the driven member, and this NN-type planetary gear mechanism is self-locking.

[0031] The handwheel 8 is coaxially installed at one end of the worm 7. The worm 7 drives the internal gear ring A1 of the integrated worm gear meshing with it to rotate. The internal gear ring A1 drives the double planetary gear 1 4 meshing with it to rotate. The double planetary gear 2 drives the internal gear ring B2 meshing with it to rotate, and the internal gear ring B2 is connected to the output disk 400.

[0032] The machine body 100 is also provided with a driving motor 200. The driving motor 200 includes a housing 21 installed on the machine body 100, a stator 22 and a rotor 23 installed in the housing 21. The rotor 23 is axially installed with the stator 22, and the rotor 23 is connected to the planet carrier 3 through a coupling 300 and drives the planet carrier 3 to rotate;

[0033] The middle of the stator 22 and the rotor 23 is hollow, and the screw 91 of the valve 9 can pass through the middle.

[0034] The driving motor 200 is an axial-flux motor and is coaxially arranged with the output shaft direction of the planet carrier 3.

[0035] The axial-flux motor is a disk-type motor with an axial magnetic field.

[0036] The application of a valve actuator on an actuator product.

[0037] The specific working process of the present utility model:

[0038] When the rotor 23 of the driving motor 200 drives the planet carrier 3 to rotate through the coupling 300, due to the self-locking of the worm gear pair composed of the worm gear integrated on the internal gear ring A1 and the worm 7, the internal gear ring A1 is fixed. The double planetary gear 1 4 installed on the planet carrier 3 through the planet gear shaft 5 and the bearing 6 meshes with the internal gear ring A1 and revolves and rotates. The double planetary gear 2 meshes with the internal gear ring B2, and the internal gear ring B2 drives the output disk 400 to rotate together. The internal gear ring A1, internal gear ring B2, planet carrier 3, double planetary gear 1 4 and double planetary gear 2 form a first-stage NN-type planetary gear reduction mechanism with the planet carrier 3 as the driving member and the internal gear ring B2 as the driven member.

[0039] When the driving motor 200 is stationary, there is no revolution torque on the double planetary gear I 4 and the double planetary gear II. The internal gear ring A1, the internal gear ring B2, the planetary gear carrier 3, the double planetary gear I 4 and the double planetary gear II form a first-stage NN-type planetary gear speed increasing mechanism with the internal gear ring B2 as the driving part and the planetary gear carrier 3 as the driven part. Since the worm gear pair composed of the worm gear integrated on the internal gear ring A1 and the worm 7 is self-locking, the internal gear ring A1 is fixed. The double planetary gear meshes with both the internal gear ring B2 and the internal gear ring A1 simultaneously, so the internal gear ring B2 cannot rotate, achieving the self-locking of the mechanism.

[0040] When an emergency occurs, such as a power outage or a line fault, the driving motor 200 stops working at this time, and it is necessary to manually rotate the handwheel 8 to work; when the handwheel 8 drives the worm 7 to rotate, the worm 7 drives the internal gear ring A1 integrated with the worm gear to rotate. The internal gear ring A1 drives the double planetary gear I 4 meshing with it to rotate self. The rotating double planetary gear II drives the internal gear ring B2 meshing with it to rotate. The internal gear ring B2 drives the output disk 400 to rotate. Since the double planetary gear II only rotates self and does not revolve, and the planetary gear carrier 3 is stationary and does not rotate, the rotor 23 of the driving motor 200 connected to the planetary gear carrier 3 through the coupling 300 is stationary and does not rotate, realizing the manual and electric automatic switching.

[0041] The stator 22 of the driving motor 200 is installed in the machine shell 21. The rotor 23 and the stator 22 are axially installed with a small axial dimension and a large torque. The middle of the stator 22 and the rotor 23 is hollow and can be connected through a valve screw mechanism; specifically, the valve 9 is connected to the internal gear ring B2 through the connecting disk 92. The screw 91 of the valve 9 extends into the hollow rotor 23. When the valve 9 is opened or closed, it is convenient for the screw 91 to move up and down inside the rotor 23. The connecting disk 92 is threadedly connected to the screw 91. Similar to the principle of a lead screw drive, the connecting disk 92 rotates under the drive of the internal gear ring B2, so that the screw 91 moves up and down.

[0042] It should be noted that the double planetary gear described in this solution is actually an integral body. In this solution, it is only for convenient description and is divided into the double planetary gear I 4 and the double planetary gear II. The double planetary gear is actually composed of two gears with different tooth numbers and different outer diameters fixed coaxially up and down, which belongs to the prior art. This is hereby stated.

[0043] The technical features not described in this utility model can be realized by or adopted the prior art, and will not be elaborated here. Of course, the above description is not a limitation to this utility model, and this utility model is not limited to the above examples. Changes, modifications, additions or substitutions made by those of ordinary skill in the art within the scope of the essence of this utility model should also belong to the protection scope of this utility model.

Claims

1. A valve actuator, comprising a body (100), characterized in that: The body (100) is provided with an inner gear ring A (1), an inner gear ring B (2), a planetary wheel carrier (3), a coaxially arranged double planetary wheel one (4) and a coaxially arranged double planetary wheel two, and forms an NN type planetary wheel mechanism, wherein the inner gear ring A (1) and the inner gear ring B (2) are coaxially arranged, and the double planetary wheel one (4) and the double planetary wheel two are both installed in the planetary wheel carrier (3) through a planetary wheel shaft (5) and a bearing (6) and can rotate freely; The machine body (100) further comprises a worm pair and an output disk (400), wherein the worm pair comprises a worm (7), a worm wheel meshingly connected to the worm (7), and a hand wheel (8), wherein the worm wheel is coaxially integrated on the inner gear ring A (1), the hand wheel (8) is coaxially mounted on one end of the worm (7), and the output disk (400) is coaxially mounted on the inner gear ring B (2).

2. A valve actuator according to claim 1, characterized in that: A double planetary gear 1 (4) mounted on a planetary gear carrier (3) through a planetary gear shaft (5) and a bearing (6) is meshed with an inner gear ring A (1) to revolve and rotate, and the double planetary gear 2 is meshed with an inner gear ring B (2), and the inner gear ring B (2) is connected to an output disk (400); The inner gear ring A (1), the inner gear ring B (2), the planetary gear carrier (3), the double planetary gear one (4) and the double planetary gear two form a first-stage NN type planetary gear reduction mechanism in which the planetary gear carrier (3) is the active one and the inner gear ring B (2) is the driven one.

3. A valve actuator according to claim 1, characterized in that: The inner gear ring A (1), the inner gear ring B (2), the planetary wheel carrier (3), the double planetary wheel one (4) and the double planetary wheel two form a first-stage NN type planetary wheel speed increasing mechanism in which the inner gear ring B (2) is active and the planetary wheel carrier (3) is driven. The NN type planetary wheel mechanism is self-locking.

4. A valve actuator according to claim 1, characterized in that: The hand wheel (8) is coaxially mounted on one end of the worm (7); the worm (7) drives the inner gear ring A (1) of the integrated worm wheel meshing with it to rotate; the inner gear ring A (1) drives the double planetary gear 1 (4) meshing with it to rotate; the double planetary gear 2 drives the inner gear ring B (2) meshing with it to rotate; the inner gear ring B (2) is connected to the output disk (400).

5. A valve actuator according to claim 1, characterized in that: The machine body (100) is also provided with a driving motor (200), the driving motor (200) comprising a housing (21) mounted on the machine body (100), a stator (22) and a rotor (23) mounted in the housing (21), the rotor (23) being axially mounted on the stator (22), the rotor (23) being connected to the planetary wheel carrier (3) via a coupling (300) and driving the planetary wheel carrier (3) to rotate; The stator (22) and the rotor (23) are hollow in the middle, so that the screw of the valve can pass through the middle.

6. A valve actuator according to claim 5, characterized in that: The drive motor (200) is an axial flux motor and is arranged coaxially with the output shaft direction of the planetary wheel carrier (3).

7. A valve actuator according to claim 6, characterized in that: The axial flux motor is a disc-type motor with an axial magnetic field.

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