Torque output shaft of electric actuator

Abstract

The utility model provides a torque output shaft of an electric actuator and the electric actuator, the torque output shaft comprises a torque output main shaft which is rotatably arranged in a shell and a fan-shaped turbine which is circumferentially fixed on the torque output main shaft, the end part of the torque output main shaft is detachably connected with a transition shaft along the axial direction; the transition shaft penetrates through an opening in the side portion of the shell and extends into the shell, and the inner side wall of the barrel structure of the transition shaft is connected with the valve rod through a key groove. The transition shaft is connected with the end face of the main shaft in an embedded mode through a protruding block and a groove. In the corresponding electric actuator, a connecting ring with threads is arranged at an opening of a shell, the transition shaft is supported on the inner side of the connecting ring through a bearing and a stepped cylinder, and a shifting piece is arranged on the outer side to facilitate quick disassembly and assembly. Through the modular design of the transition shaft, the shell does not need to be integrally disassembled when the specification of the valve rod is matched, and the replacement efficiency and the maintenance convenience are remarkably improved.

Description

Technical Field

[0001] This utility model relates to the field of electric actuator technology, and specifically to a torque output shaft for an electric actuator. Background Technology

[0002] Electric actuators, also known as electric valve devices, convert electrical signals into mechanical motion, enabling the opening and closing and precise adjustment of mechanisms such as valves and baffles. Specifically, they utilize a motor as the driving force, which is reduced in speed and increased in torque through a reduction gear mechanism before outputting a specific rotation angle.

[0003] Utility model patent CN215172626U discloses an output connection structure for an electric actuator. By providing an octagonal hole at the end of the torque output shaft, and fitting this hole onto a replaceable torque output shaft, the electric actuator can be connected to valves of different specifications simply by adjusting the torque output shaft of different sizes. However, the torque output shaft, which is rotatably located inside the housing, is connected to a sector worm gear, making its replacement somewhat inconvenient. Furthermore, care must be taken regarding the meshing relationship of the worm gear during replacement. Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings of the prior art and provide an output connection structure for an electric actuator, thereby improving the technical problem of inconvenient disassembly and assembly.

[0005] To achieve the above objectives, in a first aspect, the present invention provides a torque output shaft for an electric actuator, comprising a torque output main shaft rotatably disposed inside a housing, a fan-shaped turbine fixedly disposed circumferentially on the torque output main shaft, a transition shaft detachably connected axially to the end of the torque output main shaft, an opening provided on the side of the housing, the transition shaft passing through the opening and disposed inside the housing, the transition shaft being a cylindrical body, and the inner sidewall of the transition shaft being used to connect a valve stem passing through the opening.

[0006] To prevent relative slippage between the transition shaft and the torque output spindle due to high torque loads, and to establish an axial alignment reference so that operators can achieve precise docking of the transition shaft and the torque output spindle without the need for special tools, and to reduce the difficulty of disassembly and assembly, a preferred embodiment is that the end faces of the transition shaft and the torque output spindle are fitted together.

[0007] As a preferred embodiment, the end face of the transition shaft is provided with at least one set of protrusions along the axial direction, and the end face of the torque output spindle is provided with a groove that adapts to the protrusions.

[0008] To ensure efficient torque transmission and precise alignment, and to guarantee the synchronization of the electric actuator's output action with the valve opening, the connection process is simplified while eliminating hole misalignment issues associated with traditional flange bolt fixing methods. This enhances the contact area of ​​the circumferential force-bearing surface, improves transmission stability and overload resistance, and thus adapts to different torque levels and complex load conditions in industrial scenarios. As a preferred implementation, a keyway is provided on the inner wall of the transition shaft.

[0009] To ensure compatibility with valve stems of different cross-sectional shapes and avoid clearance issues caused by valve stem machining errors, the keyway is preferably one of a single-key keyway, a symmetrical double-key keyway, or a spline keyway.

[0010] Secondly, this utility model also relates to an electric actuator having any or at least one of the above-mentioned technical features.

[0011] To facilitate easier disassembly and assembly of the transition shaft from the housing, provide axial support for the transition section, and facilitate valve stem connection, a preferred embodiment includes a connecting ring at the opening of the housing, the outer circumference of which is threaded to the housing.

[0012] To reduce frictional resistance during the rotation of the transition shaft, improve transmission efficiency, and extend component life, a preferred embodiment is provided in which a bearing is coaxially connected to the inner side of the housing, the inner side of the bearing is fixed to the connecting ring, and the outer side of the bearing is connected to the end of the transition shaft away from the torque output main shaft.

[0013] In order to properly fix the bearing and improve the concentricity of the transition shaft and the bearing, and prevent misalignment, as a preferred embodiment, the connection between the transition shaft and the bearing is made by a stepped cylinder.

[0014] To facilitate easier separation of the connecting ring from the housing, in a preferred embodiment, a lever is radially provided on the side of the connecting ring furthest from the housing.

[0015] The advantages and beneficial effects of this utility model are as follows: The transition shaft is axially detachable and connected to the end of the torque output main shaft. When matching valve stems of different specifications, only the transition shaft needs to be replaced, without disassembling the entire housing, which facilitates maintenance. The end face of the transition shaft and the end face of the main shaft are engaged by a protrusion-groove fit, which enhances the torsional strength and prevents transmission slippage. The keyway on the inner side of the transition shaft connects to the valve stem that passes through the opening, which is quick and convenient.

[0016] A threaded connecting ring is installed at the side opening of the housing, and the tightness between the ring and the housing can be adjusted by rotation. The inner ring of the bearing is fixed to the connecting ring, and the outer ring is connected to the far end of the transition shaft through a stepped cylinder, forming a multi-stage support structure to reduce radial vibration. The radial lever on the outside of the connecting ring facilitates quick manual disassembly and assembly, adapting to tool-free operation scenarios. Attached Figure Description

[0017] Figure 1 This is a cross-sectional structural schematic diagram of the present invention;

[0018] Figure 2 This is a schematic diagram of the transition shaft of this utility model;

[0019] Figure 3 This is an enlarged structural schematic diagram of point A in this utility model;

[0020] Reference numerals: 1-Housing, 2-Torque output spindle, 3-Fan-shaped turbine, 4-Transition shaft, 5-Opening, 6-Protrusion, 7-Groove, 8-Keyway, 9-Connecting ring, 10-Thread, 11-Bearing, 12-Stepped cylinder, 13-Paddle. Detailed Implementation

[0021] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of this utility model and should not be construed as limiting the scope of protection of this utility model.

[0022] Example 1

[0023] Please see Figures 1-2 An electric actuator torque output shaft includes a torque output main shaft 2 rotatably disposed inside a housing 1. The torque output main shaft 2 is circumferentially fixedly connected to a fan-shaped turbine 3. The end of the torque output main shaft 2 is axially detachably connected to a transition shaft 4. The two are detachably connected by end face fitting. The transition shaft 4 passes through an opening 5 on the side of the housing 1, and its inner wall is directly sleeved with a valve stem through an elastic sleeve (rubber sleeve).

[0024] Example 2

[0025] An electric actuator torque output shaft, based on embodiment 1, has two sets of protrusions 6 axially arranged on the end face of the transition shaft 4, and a groove 7 adapted to the protrusions 6 is provided on the end face of the torque output main shaft 2, forming a mechanical interlock; a single keyway 8 is opened on the inner side wall of the transition shaft 4, and the keyway 8 cooperates with the key on the valve stem to transmit torque. A connecting ring 9 is threadedly connected to the opening 5 of the housing 1. After the connecting ring 9 is removed from the housing 1, the transition shaft 4 can be taken out from the inside of the housing through the opening. The inner diameter of the connecting ring 9 allows the valve stem to be keyed to the transition shaft 4 while also limiting the axial movement of the transition shaft 4.

[0026] Example 3

[0027] In an electric actuator, based on embodiment 2, a connecting ring 9 is coaxially mounted with a bearing 11 inside the housing. The outer ring of the bearing 11 is connected to a stepped cylinder 12 located at the lower end of a transition shaft 4. Two levers 13 are radially extended from the outer side of the connecting ring 9 away from the housing.

[0028] Example 4 is an electric actuator having a torque output shaft and a corresponding housing as described in any one of Examples 1-3.

[0029] The working principle of this utility model is as follows: First, the keyway 8 on the inner side of the transition shaft 4 matches the key size of the valve stem to be connected. The mating surfaces of the groove 7 on the end face of the torque output main shaft 2 and the protrusion 6 on the end face of the transition shaft 4 are checked to ensure compatibility. When the transition shaft 4 needs to be replaced, the paddle 13 is rotated in the reverse direction to disengage the connecting ring 9, and the transition shaft 4 is pulled out axially, causing the protrusion 6 to disengage from the groove 7. The original transition shaft is then removed. The compatible transition shaft 4 is pushed axially into the opening 5 of the housing 1, aligning the protrusion 6 with the groove 7 on the end face of the main shaft 2. Axial pressure is applied until the transition shaft 4 and the main shaft 2 are fully engaged. The paddle 13 is rotated to move the connecting ring 9 into the housing 1 until the outer ring of the bearing 11 mates with the stepped cylinder 12. The valve stem is passed through the cylinder of the transition shaft 4, ensuring that the key on the valve stem is aligned with the keyway 8. A locking nut or snap ring is used to secure the end of the valve stem to prevent axial movement.

[0030] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A torque output shaft for an electric actuator, comprising a torque output main shaft (2) rotatably disposed inside a housing (1), wherein a sector turbine (3) is circumferentially fixedly disposed on the torque output main shaft (2), characterized in that: The end of the torque output main shaft (2) is detachably connected to a transition shaft (4) along the axial direction. The housing (1) has an opening (5) on its side. The transition shaft (4) passes through the opening (5) and is located inside the housing (1). The transition shaft (4) is a cylindrical structure.

2. The torque output shaft of the electric actuator according to claim 1, characterized in that: The transition shaft (4) is fitted and connected to the end face of the torque output main shaft (2).

3. The torque output shaft of the electric actuator according to claim 2, characterized in that: The end face of the transition shaft (4) is provided with at least one set of protrusions (6) along the axial direction, and the end face of the torque output main shaft (2) is provided with a groove (7) that is adapted to the protrusions (6).

4. The torque output shaft of the electric actuator according to claim 1, characterized in that: The inner wall of the transition shaft (4) is provided with a keyway (8).

5. The torque output shaft of the electric actuator according to claim 4, characterized in that: The keyway (8) is one of a single-key keyway, a symmetrical double-key keyway, or a spline keyway.

6. An electric actuator, characterized in that: The electric actuator includes a torque output shaft as claimed in any one of claims 1 to 5.

7. The electric actuator according to claim 6, characterized in that: A connecting ring (9) is provided at the opening (5) of the housing (1), and the outer periphery of the connecting ring (9) is connected to the housing (1) by a thread (10).

8. The electric actuator according to claim 7, characterized in that: The connecting ring (9) is coaxially connected to a bearing (11) on the inner side of the housing (1). The inner side of the bearing (11) is fixed to the connecting ring (9), and the outer side of the bearing (11) is connected to one end of the transition shaft (4) away from the torque output main shaft (2).

9. The electric actuator according to claim 8, characterized in that: The transition shaft (4) and the bearing (11) are connected by a stepped tube (12).

10. The electric actuator according to claim 7, characterized in that: The connecting ring (9) has a paddle (13) radially disposed on the side away from the housing (1).

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