Manual and automatic switching device of valve electric actuator

Abstract

The invention provides a manual and automatic switching device of a valve electric actuator, which comprises a clutch rotating shaft, two transmission gears are coaxially connected onto the clutch rotating shaft, the two transmission gears are respectively in transmission connection with a manual module and an electric module, and a clutch wheel is arranged between the two transmission gears; the clutch wheel can axially move along the clutch rotating shaft, and when the clutch wheel axially moves to a limit position along the clutch rotating shaft, the clutch wheel can synchronously rotate with the two transmission gears respectively; the supporting column is arranged between the first transmission gear and the clutch wheel, when the supporting column is in a vertical posture, one end of the supporting column can abut against the first transmission gear, and the other end of the supporting column supports the clutch wheel to rotate synchronously with the second transmission gear; when the supporting column is in the lodging posture, the clutch wheel and the first transmission gear can rotate synchronously, and the supporting column is provided with a limiting column matched with the limiting flange. The posture of the supporting column is changed, so that the electric actuator is switched between a manual mode and an automatic mode, a pressure spring is omitted, and the electric actuating mechanism is simplified and is more convenient to mount.

Description

Technical Field

[0001] The invention belongs to the field of valve control, and in particular relates to a manual-automatic switching device of a valve electric actuator. Background Art

[0002] The valve electric actuator refers to a machine that uses electricity as the main energy source to drive the valve. It controls the opening and closing of the valve through a motor, but in special circumstances, it is also necessary to manually operate the electric actuator to control the valve urgently. In order to achieve the switching between manual operation and electric automatic operation, a clutch is set inside the existing electric actuator to switch the torque transmission module. The existing clutch switching structure often drives the switching body on the switching handle shaft to rotate clockwise by operating the switching handle shaft. The switching body is connected to a torsion spring, and the clutch is kept in the engaged or disengaged state by the torsion spring. One end of the switching body presses down the clutch, and a compression spring is installed in the axial direction of the clutch. Through the contact between the switching body and the clutch, the compression spring is compressed to achieve the purpose of changing the clutch position. When the force applied to the switching handle shaft is removed, the compression spring is reset, the clutch rises, and the switching body is driven to rotate counterclockwise to achieve the effect of clutch reset. Although this structure of adding a compression spring in the axial direction of the clutch and adjusting the clutch position through the contact of the switching body can achieve the effect of clutch reset, in actual application, the overall switching structure needs to be fixed on the frame, and the torsion spring needs to be compressed during the installation of the switching body, which makes it inconvenient for operators to install. Moreover, each time the manual and automatic modes are changed, a wrench needs to be pulled, which makes the operation complicated. Summary of the invention

[0003] In view of this, the present invention aims to provide a manual-automatic switching device for a valve electric actuator to simplify the structure of the manual-automatic switching of the electric actuator and make the switching structure easier to install.

[0004] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0005] A manual-automatic switching device for a valve electric actuator, comprising

[0006] A clutch shaft, on which a first transmission gear and a second transmission gear are coaxially connected, the first transmission gear is transmission-connected to the manual module, the second transmission gear is transmission-connected to the electric module, and a clutch wheel is disposed between the first transmission gear and the second transmission gear;

[0007] The clutch wheel can move axially along the clutch shaft, and when the clutch wheel moves axially along the clutch shaft to the limit position, it can be respectively attached to the first transmission gear or the second transmission gear and rotate synchronously;

[0008] A support column is placed between the first transmission gear and the clutch wheel. The support column can be transformed into a vertical posture or an inverted posture by rotating around the rotating axis. When the support column is in the vertical posture, one end of the support column can be against the first transmission gear, and the other end supports the clutch wheel to rotate synchronously with the second transmission gear; when the support column is in the inverted posture, the clutch wheel can rotate synchronously with the first transmission gear.

[0009] Furthermore, the rotating shaft of the support column is placed at one end of the support column, and the end of the support column that abuts against the first transmission gear is away from the rotating shaft of the support column, and the axial direction of the rotating shaft is perpendicular to the axial direction of the support column.

[0010] Furthermore, an abutting plane is provided at one end of the support column abutting against the first transmission gear, and a rounded corner is provided at the edge of the abutting plane.

[0011] Furthermore, a support head is provided at the top end of the support column toward the clutch wheel, and a boss is extended outwardly along the circumference of the clutch wheel, and the boss can be overlapped on the support head.

[0012] Furthermore, meshing teeth are extended axially from both end faces of the clutch wheel, and meshing teeth are extended toward the clutch wheel from the surfaces of the first transmission gear and the second transmission gear on one side of the clutch wheel, and the clutch wheel rotates synchronously with the first transmission gear or the second transmission gear through the meshing teeth that cooperate with each other.

[0013] Furthermore, the switching device also includes a limit plate, on which a limit rib is provided, and a limit column is provided in the middle of the support column. When the support column changes from a lying posture to a vertical posture, the limit column can move against the limit rib.

[0014] Furthermore, the switching device also includes a switching crank, the end of which is connected to the support column via a rotating shaft, and the switching crank can rotate around the other end thereof.

[0015] Furthermore, the support head is formed by extending the crank outward.

[0016] Furthermore, the knob is connected to the crank via a connecting shaft, and the connecting shaft passes through a limiting plate.

[0017] Compared with the prior art, the manual-automatic switching device of a valve electric actuator described in the present invention has the following advantages:

[0018] The present invention utilizes the change in posture of the support column to drive the change in position of the clutch wheel, so that the electric actuator can realize the switching of the manual and automatic modes, eliminating the compression spring, simplifying the structure of the electric actuator, making the electric actuator structure easier to install, and ensuring the reliability of the switching process through the cooperation of the limit column and the limit frame;

[0019] The support column and the first transmission gear are offset against each other. When the automatic mode needs to be switched, it is only necessary to start the motor of the electric actuator to drive the first transmission gear to rotate, thereby quickly destroying the force position of the support column, causing the support column to fall down, and switching the electric actuator to the automatic state, eliminating the step of turning the wrench back and forth. At the same time, when the electric actuator suddenly works electrically, the transmission connection of the manual operation is directly cut off, which protects the operator.

[0020] The support head is arranged on the crank to prevent the clutch wheel from affecting the support column in the process of rotation, causing the support column to fall down accidentally.

[0021] The limiting rib and the limiting column are matched to ensure that the supporting column rotates around the rotating shaft when the crank drives the supporting column to move. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0023] Figure 1 It is a schematic diagram of the internal transmission mechanism of the electric actuator;

[0024] Figure 2 It is a schematic diagram of the hand automatic transformation structure;

[0025] Figure 3 It is a cross-sectional schematic diagram of the hand automatic transformation structure;

[0026] Figure 4 It is a schematic diagram of the vertical posture of the support column;

[0027] Figure 5 This is a schematic diagram of the posture of the support column after it falls to both sides;

[0028] Figure 6 It is a schematic diagram of the clutch wheel structure;

[0029] Figure 7 It is a schematic diagram of the support column structure;

[0030] Figure 8 It is a schematic diagram of the limiting frame structure in the limiting piece.

[0031] Description of reference numerals:

[0032] 1-clutch shaft; 11-first transmission gear; 12-second transmission gear; 13-clutch wheel; 131-engaging teeth; 132-boss; 2-support column; 21-top plane; 22-limiting column; 3-crank; 31-support head; 32-rotating shaft; 4-knob; 5-connecting shaft; 6-torque output gear; 7-executing gear; 8-limiting plate; 81-limiting frame; 811-limiting retaining edge; 812-accommodating portion. DETAILED DESCRIPTION

[0033] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0034] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0035] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0036] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0037] The manual-automatic switching device of the valve electric actuator described in the present invention comprises a clutch shaft 1, on which a first transmission gear 11 and a second transmission gear 12 are sleeved, and the first transmission gear 11 is transmission-connected to the manual module, and the second transmission gear 12 is transmission-connected to the electric module, a clutch wheel 13 is placed between the first transmission gear 11 and the second transmission gear 12, and the clutch wheel 13 rotates synchronously with the clutch shaft 1. In this embodiment, the clutch wheel 13 is connected to the clutch shaft 1 through a spline or a sliding key; a support column 2 is provided between the first transmission gear 11 and the clutch wheel 13, and a crank 3 is connected to one end of the support column 2 through a rotating shaft 32, and The axial length of the rotating shaft 32 is perpendicular to the length direction of the support column 2, and the crank 3 can rotate around its other end, and when the crank 3 rotates, it can drive one end of the support column 2 to move upward. Under the action of the rotating shaft 32 and its own gravity, the support column 2 can be transformed from a lying posture to a vertical posture. A support head 31 extends outward from the end of the crank 3, and a boss 132 extends outward along the circumference of the edge of the clutch wheel 13, and the support head 31 is below the boss 132. When the support head 31 moves upward, the clutch wheel 13 can cooperate with the boss 132 and the support head 31 to make the clutch wheel 13 and the support head 31 move synchronously along the axial direction of the clutch rotating shaft 1. When the support column 2 is in a vertical state, the bottom end of the support column 2 abuts against the first transmission gear 11, so that the support column 2 maintains a fixed posture, thereby making the support head 31 in the upper limit position, and the clutch wheel 13 in the upper limit position; when the support column 2 rotates and is in a prostrate state, the support head 31 is in the lower limit position, and the support head 31 is placed between the boss 132 and the first transmission gear 11. Optionally, the support head 31 can also be set as a whole with the support column 2.

[0038] Optionally, the clutch wheel 13 can be connected to the first transmission gear 11 and the second transmission gear 12 through friction, so that when the clutch wheel 13 is in the upper limit position, the upper end surface of the clutch wheel 13 is in contact with the second transmission gear 12. When the operator turns the handwheel of the manual operation module, the torque is transmitted to the second transmission gear 12 through gear transmission, and then the second transmission gear 12 drives the clutch wheel 13 to rotate through the friction force. Similarly, when the clutch wheel 13 is in the lower limit position, the clutch wheel 13 is in contact with the first transmission gear 11. When the electric module is started, the motor transmits the torque to the first transmission gear 11 through gear transmission, and drives the clutch wheel 13 to rotate through friction, thereby rotating the clutch shaft 1. In this embodiment, a torque output gear 6 is provided on the clutch shaft 1. When the clutch shaft 1 rotates, the torque output gear 6 drives the actuator gear 7 on one side. The actuator gear 7 is connected to the valve stem of the valve through a linkage shaft, thereby driving the valve stem of the valve to move along the axis or rotate around the axis according to the needs of the scene.

[0039] In this embodiment, in order to improve the torque transmission reliability between the clutch wheel 13 and the first transmission gear 11 and the second transmission gear 12, meshing teeth 131 are extended axially from the two end surfaces of the clutch wheel 13 respectively, and the surfaces of the first transmission gear 11 and the second transmission gear 12 facing the side of the clutch wheel 13 extend meshing teeth 131 toward the clutch wheel 13, and the clutch wheel 13 rotates synchronously with the first transmission gear 11 or the second transmission gear 12 through the meshing teeth 131 that cooperate with each other.

[0040] The support column 2 is provided with a top surface 21 at one end away from the rotating shaft 32, and the edge of the top surface 21 is rounded. When the support column 2 maintains a vertical posture, when the first transmission gear 11 rotates, the force between the top surface of the support column 2 and the first transmission gear 11 becomes unstable, causing the support column 2 to deflect and fall to one side. The rounded corner design prevents the support column 2 from scratching the first transmission gear 11.

[0041] The manual-automatic switching device of the valve electric actuator described in the present invention also includes a limit plate 8. The crank 3 is connected to a knob 4 through a connecting shaft 5, and the crank 3 passes through the limit plate 8 so that the knob 4 is placed outside the electric actuator to facilitate the operator to operate the knob 4. The limiting plate 8 is provided with a special-shaped hole as a limiting frame 81, and two limiting ribs 811 are provided on the upper edge of the limiting frame 81, and the two limiting ribs 811 are inclined, and their tops are connected to each other so that the two limiting ribs 811 are arranged in an inverted V shape, and an accommodating portion 812 is also provided below the two limiting ribs, and a limiting column 22 extends outward from the middle part of the support column 2, and when the support column 2 is in a lying posture, the limiting column 22 is placed at the lower end of one of the limiting ribs 811, that is, away from the end of the other limiting rib. More specifically, the support column can be placed in the accommodating portion 812 at this time, and when the support column 2 changes to a vertical posture, the limiting rib 811 can pull the support column 2 downward through the limiting column 22, so that the support column 2 is in a vertical posture, to prevent the support column 2 from being unable to rotate with the rotating shaft 32 when the support column 2 and the rotating shaft 32 are stuck.

[0042] The manual-automatic switching device of the valve electric actuator described in the present invention, during the installation process, the assembler only needs to install the various parts together in a predetermined order, without involving parts such as springs, and does not need to work with the elastic force of the customer springs, which reduces the labor intensity of the assembler and reduces the difficulty of installation. During the working process, the support column 2 can be converted to a vertical posture by rotating the knob 4, so that the meshing teeth 131 at the top of the clutch wheel 13 are meshed with the meshing teeth 131 of the second transmission gear 12, so that the second transmission gear 12 can drive the clutch wheel 13 and the clutch shaft 1 to rotate, thereby completing the change of the valve state; when it is necessary to convert to the automatic control state, it is only necessary to start the motor of the electric actuator to rotate the first transmission gear 11, thereby converting the support column 2 into a lying posture, so that the meshing teeth 131 at the bottom of the clutch wheel 13 are meshed with the meshing teeth 131 of the first transmission gear 11, so that the first transmission gear 11 drives the clutch shaft 1 to rotate.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A manual-automatic switching device for a valve electric actuator, characterized in that: include A clutch shaft, on which a first transmission gear and a second transmission gear are coaxially connected, the first transmission gear is transmission-connected to the manual module, the second transmission gear is transmission-connected to the electric module, and a clutch wheel is disposed between the first transmission gear and the second transmission gear; The clutch wheel can move axially along the clutch shaft, and when the clutch wheel moves axially along the clutch shaft to the limit position, it can be in contact with the first transmission gear or the second transmission gear and rotate synchronously; A support column, which is placed between the first transmission gear and the clutch wheel, and the support column can be transformed into a vertical posture or a lying posture by rotating around the rotation axis, and when the support column is in the vertical posture, one end of the support column can be against the first transmission gear, and the other end supports the clutch wheel to rotate synchronously with the second transmission gear; when the support column is in the lying posture, the clutch wheel can rotate synchronously with the first transmission gear; The support column extends outwardly to form a limiting column, and the limiting column passes through a limiting frame. The limiting frame includes at least one limiting rib, and when the support column rotates from a lying posture to a vertical posture, the limiting column can abut against the limiting rib and move along the limiting rib.

2. The manual-automatic switching device of a valve electric actuator according to claim 1, characterized in that: There are two limit guards, and one end of the two limit guards is connected to each other so that the two limit guards form a V shape. When the support column is in a lying position, the limit column is placed at the end of one of the limit guards away from the other limit guard. When the support column is in a vertical position, the limit column is placed at one end where the two limit guards are connected.

3. A manual-automatic switching device for a valve electric actuator according to claim 1 or 2, characterized in that: The limiting frame also includes a receiving portion disposed at the bottom end of the limiting retaining edge, and when the supporting column is in a lying posture, the limiting column is disposed in the receiving portion.

4. The manual-automatic switching device of a valve electric actuator according to claim 1, characterized in that: The rotating shaft of the support column is arranged at one end of the support column, and the end of the support column abutting against the first transmission gear is far away from the rotating shaft of the support column, and the axial direction of the rotating shaft is perpendicular to the axial direction of the support column.

5. The manual-automatic switching device of a valve electric actuator according to claim 1, characterized in that: An abutting plane is arranged at one end of the support column abutting against the first transmission gear, and a rounded corner is provided at the edge of the abutting plane.

6. The manual-automatic switching device of a valve electric actuator according to claim 1, characterized in that: A support head is arranged at the top end of the support column toward the clutch wheel. A boss is extended outwardly along the circumference of the clutch wheel. The boss can be overlapped on the support head.

7. The manual-automatic switching device of a valve electric actuator according to claim 1, characterized in that: Meshing teeth are extended axially from both end faces of the clutch wheel, and meshing teeth are extended toward the clutch wheel from the surfaces of the first transmission gear and the second transmission gear facing the clutch wheel. The clutch wheel rotates synchronously with the first transmission gear or the second transmission gear through the meshing teeth that cooperate with each other.

8. The manual-automatic switching device of a valve electric actuator according to claim 6, characterized in that: It also includes a limiting piece, and the limiting frame is a special-shaped hole opened on the limiting piece.

9. The manual-automatic switching device of a valve electric actuator according to claim 8, characterized in that: It also includes a switching crank, the end of which is connected to the supporting column through a rotating shaft, and the switching crank can rotate around the other end of itself.

10. The manual-automatic switching device of a valve electric actuator according to claim 8, characterized in that: The support head is formed by extending the crank outwards.

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