Common electric actuator power line phase sequence misconnection protection structure and actuator

Abstract

The utility model discloses a normal type electric actuator power line phase sequence misconnection protection structure and an actuator, the normal type electric actuator power line phase sequence misconnection protection structure comprises a mounting seat and a trigger assembly, the trigger assembly comprises a rotating shaft rotating on the mounting seat, the rotating shaft is provided with a driving part matched with an annular projection and a trigger assembly for triggering a microswitch, and the driving part is provided with an annular projection. The device is characterized in that the mounting seat is provided with a microswitch assembly, the microswitch assembly is provided with at least four microswitches, and the trigger assembly is provided with trigger parts corresponding to the microswitches. The utility model has the following advantages and effects: when the phase sequence of an input power supply or a control line is wrongly connected, the trigger can prompt and protect the actuator, and normal use is not influenced.

Description

Technical Field

[0001] This utility model relates to the field of electric actuators, and more specifically, it relates to a protection structure for incorrect phase sequence connection of power lines in a general electric actuator and the actuator itself. Background Technology

[0002] A valve electric actuator is a device that can automatically control the opening and closing of valves, enabling precise control of fluid parameters such as flow rate and pressure.

[0003] Valve electric actuators on the market include a motor, a protective structure, a worm gear, and a worm. The motor drives the rotation of the worm gear and worm, and the worm connects to the valve drive shaft to control the opening and closing of the valve. When the worm gear switches between forward and reverse rotation, the worm, which it works with, will move to a certain extent axially. The protective structure is a protective device that cuts off the motor when the worm moves too far. One end of the worm has a protruding annular protrusion, and a sliding groove is formed between two annular protrusions. The protective structure includes a triggering component and a micro switch. The triggering component is located in the sliding groove. When the worm moves excessively, the annular protrusion will drive the triggering component to trigger the micro switch to open or close the electric actuator.

[0004] If the power line and control line are reversed when wiring the electric actuator, the triggering component will trigger the wrong microswitch, preventing the electric actuator from being powered off. The electric actuator will continue to work until the motor and other transmission components of the electric actuator are damaged. Utility Model Content

[0005] This utility model provides a protection structure for incorrect phase sequence connection of the power supply line of an electric actuator, aiming to solve the problem that electric actuators in the prior art do not have a protection structure for incorrect connection.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a common type electric actuator power line phase sequence misconnection protection structure, including a mounting base and a trigger assembly. The trigger assembly includes a rotating shaft rotating on the mounting base. The rotating shaft is provided with a driving part that cooperates with an annular protrusion and a trigger assembly that triggers micro switches. The mounting base is provided with a micro switch assembly, and the micro switch assembly is provided with at least four micro switches. The trigger assembly is provided with a trigger part corresponding to the micro switches. The trigger parts are staggered in the circumferential direction of the rotating shaft.

[0007] The present invention is further configured such that: the micro switch assembly includes a micro switch group one and a micro switch group two, each micro switch of the micro switch assembly has a guide piece for trigger contacts, the micro switch guide pieces on the micro switch group one and the micro switch group two face opposite directions, and each group is provided with at least two micro switches.

[0008] The present invention is further configured such that: one of the micro switch group one and the micro switch group two includes a valve closing torque fault switch and a valve opening phase sequence fault switch, and the other of the micro switch group one and the micro switch group two includes a valve opening torque fault switch and a valve closing phase sequence fault switch, and at least one of the valve closing torque fault switch, the valve opening phase sequence fault switch, the valve opening torque fault switch, and the valve closing phase sequence fault switch is provided.

[0009] The present invention is further configured such that: the triggering component includes a triggering structure one and a triggering structure two, the triggering parts on the triggering structure one and the triggering structure two are arranged radially symmetrically along the rotation axis, and the triggering parts on the triggering structure one and the triggering structure two are staggered in the circumferential direction of the rotation axis.

[0010] This utility model is further configured such that: the triggering parts on triggering structure one and triggering structure two correspond one-to-one with the drive rods of microswitch group one and microswitch group two, respectively; the stroke of the triggering part corresponding to the valve opening phase sequence fault switch is shorter than the stroke of the triggering part corresponding to the valve closing over-torque fault switch; and the stroke of the triggering part corresponding to the valve closing phase sequence fault switch is shorter than the stroke of the triggering part corresponding to the valve opening over-torque fault switch.

[0011] The present invention is further configured such that: the triggering component includes a trigger plate fixed to the rotating shaft, and the triggering part is a protrusion integrally formed with the trigger plate.

[0012] The present invention is further configured such that: a trigger element is fixedly connected to the trigger piece, and the trigger element has the trigger portion formed thereon.

[0013] The present invention is further configured such that: the triggering component includes a trigger block sleeved on the rotating shaft, and the triggering part is a protrusion integrally formed with the trigger block.

[0014] The present invention is further configured such that: the drive rod includes a rotating part, and the rotating part is rotatably fixed to one end of the drive rod away from the micro switch.

[0015] An actuator includes a housing, within which a motor, a worm gear, and a worm are disposed. The motor drives the rotation of the worm gear and the worm. A sliding groove is formed on the worm. The actuator is characterized in that the housing is equipped with the aforementioned electric actuator misconnection protection structure.

[0016] This invention has the following advantages: by setting staggered contact ends, the contact between the contact ends and the micro switch is different in sequence, ensuring that electric cutting can still be performed even when the connection is incorrect. Attached Figure Description

[0017] Figure 1 This is a side view of an embodiment of the present utility model;

[0018] Figure 2 This is a schematic diagram of the trigger plate structure according to an embodiment of the present invention;

[0019] Figure 3 This is a top view of an embodiment of the present utility model;

[0020] Figure 4 This is a diagram of the worm gear structure in an electric actuator that cooperates with this invention.

[0021] Figure 5 (A) and (B) are perspective views of the first embodiment and the second embodiment of the micro switch of this utility model;

[0022] Figure 6 This is a perspective view of the device equipped with a trigger block in an embodiment of this utility model.

[0023] In the diagram: 1. Mounting base; 12. Worm gear; 13. Sliding groove; 2. Rotating shaft; 3. Micro switch assembly; 31. Micro switch; 31. Rotating part; 4. Trigger plate; 41. Trigger part; 5. Trigger block; 6. Valve closing torque fault switch; 7. Valve opening phase sequence fault switch; 8. Valve opening torque fault switch; 9. Valve closing phase sequence fault switch. Detailed Implementation

[0024] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0025] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] Reference Figures 1 to 6 The embodiments of this utility model will be further described below.

[0027] A common type of electric actuator power line phase sequence misconnection protection structure includes a mounting base 1 and a trigger assembly. The trigger assembly includes a rotating shaft 2 that rotates on the mounting base 1. The rotating shaft 2 is provided with a driving part that cooperates with an annular protrusion and a trigger assembly that triggers micro switches 31. The mounting base 1 is provided with a micro switch 31 assembly 3, and the micro switch 31 assembly 3 is provided with at least four micro switches 31. The trigger assembly is provided with a trigger part 41 corresponding to the micro switches 31. The trigger parts 41 are staggered in the circumferential direction of the rotating shaft 2, and are provided with four micro switches 31. Compared with the prior art, at least two more micro switches 31 are added, so that even if the line is reversed, the added micro switches 31 can still cut off the motor, effectively ensuring the protection of the actuator itself when the line is misconnected.

[0028] The micro switch assembly 31 includes a micro switch group 1 and a micro switch group 2. Each micro switch 31 in the micro switch assembly 31 has a guide plate for triggering contacts. The guide plates of the micro switches 31 in the micro switch group 1 and the micro switch group 31 in the micro switch group 2 face opposite directions, and each group has at least two micro switches 31. The micro switches 31 are divided into two groups and stacked and fixed on the mounting base 1, and the guide plates of the two groups of micro switches 31 are opposite. When the worm gear 12 rotates too far forward or too far in reverse, the rotating shaft 2 rotates forward or in reverse accordingly, which can trigger the two groups of micro switches 31 respectively. Each group of micro switches 31 has at least two, which ensures that the micro switches 31 can be triggered to cut off the motor whether the wire is connected correctly or reversed.

[0029] One of the micro switch group 31 and the micro switch group 31 includes a valve closing over-torque fault switch 6 and a valve opening phase sequence fault switch 7. The other of the micro switch group 31 and the micro switch group 31 includes a valve opening over-torque fault switch 8 and a valve closing phase sequence fault switch 9. At least one of the valve closing over-torque fault switch 6, the valve opening phase sequence fault switch 7, the valve opening over-torque fault switch 8, and the valve closing phase sequence fault switch 9 is provided.

[0030] The triggering component includes a triggering structure one and a triggering structure two. The triggering parts 41 on the triggering structure one and the triggering structure two are arranged radially symmetrically along the rotation axis 2, and the triggering parts 41 on the triggering structure one and the triggering structure two are staggered in the circumferential direction of the rotation axis 2.

[0031] The triggering parts 41 on triggering structure one and triggering structure two correspond one-to-one with the drive rods of microswitch group one and microswitch group two, respectively. The stroke of the triggering part 41 corresponding to the valve opening phase sequence fault switch 7 is shorter than the stroke of the triggering part 41 corresponding to the valve closing over-torque fault switch 6, and the stroke of the triggering part 41 corresponding to the valve closing phase sequence fault switch 9 is shorter than the stroke of the triggering part 41 corresponding to the valve opening over-torque fault switch 8. For efficiency and structural considerations, four microswitches 31 can be used in actual use, one for each valve closing over-torque fault. There is one of each of the following: switch 6, valve opening phase sequence fault switch 7, valve opening over-torque fault switch 8, and valve closing phase sequence fault switch 9. For ease of description, the following text will use the example of the valve closing over-torque fault switch 6, valve opening phase sequence fault switch 7, valve opening over-torque fault switch 8, and valve closing phase sequence fault switch stacked on the mounting base 1 from top to bottom. In actual use, the two groups of micro switches 31 group one and micro switches 31 group two can be adjusted up and down, and the switches within the group can also be adjusted up and down. Then, the trigger part 41 can be adjusted accordingly.

[0032] When the electric actuator is connected to the wrong power or control line when opening the valve; (the valve closing torque fault switch 6, valve opening phase sequence fault switch 7, valve opening torque fault switch 8, and valve closing phase sequence fault switch 9 are stacked from top to bottom)

[0033] 1. When the valve opening button is pressed in the remote control box or central control room, the electric actuator will move in the valve closing direction. When the trigger component presses the valve opening phase sequence fault switch 7, it will cut off the power to protect the electric actuator and output a set of unconnected valve opening phase sequence fault signals to the control box or central control room. At this time, you only need to reconnect the power line or control line correctly, and the electric actuator will run normally and the fault signal will be automatically extinguished.

[0034] 2. When the valve close button is pressed in the remote control box or central control room, the electric actuator will move in the valve open direction. When the trigger component presses the valve close phase sequence fault switch 9, it will cut off the power to protect the electric actuator and output a set of uncontact valve close phase sequence fault signals to the control box or central control room. At this time, you only need to reconnect the power line or control line correctly, and the electric actuator will run normally and the fault signal will be automatically extinguished.

[0035] When the electric actuator is connected to the correct power or control line when opening the valve;

[0036] 1. When the electric actuator is operating normally in valve opening mode, if the electric actuator experiences excessive torque due to the medium in the pipeline or other reasons, the contact part with a relatively short stroke in the triggering component will press the valve closing phase sequence fault switch 9 2 seconds in advance, outputting a set of valve closing phase sequence fault signals. In the following 2 seconds, the contact part with a relatively long stroke in the triggering component will press the valve opening over-torque fault switch 8, cutting off the power supply to protect the electric actuator and outputting a set of valve opening over-torque fault signals. At the same time, the control box or central control room will display one valve closing phase sequence fault and one valve opening over-torque fault.

[0037] 2. When the electric actuator is operating normally in valve closing mode, if the electric actuator experiences excessive torque due to the medium in the pipeline or other reasons, the contact part with a relatively short stroke in the triggering component will press the valve opening phase sequence fault switch 7 2 seconds in advance, outputting a set of valve opening phase sequence fault signals. 2 seconds later, the contact part with a relatively long stroke in the triggering component will press the valve closing over-torque fault switch 6, cutting off the power supply to protect the electric actuator and outputting a set of valve closing over-torque fault signals. The control box or central control room will simultaneously display one valve opening phase sequence fault and one valve closing over-torque fault.

[0038] The triggering assembly includes a trigger plate 4 fixed to the rotating shaft 2. The triggering part 41 is a protrusion integrally formed with the trigger plate 4. Depending on the application, a plate-shaped triggering assembly can be used, which is more cost-effective and easier to install (see attached diagram). Figure 1 ).

[0039] A trigger element is fixedly connected to the trigger piece 4, and the trigger element has the trigger part 41 formed on it. This structure allows for the direct installation of a second, staggered trigger piece 4 on the trigger piece 4, saving costs and making adjustment and installation convenient.

[0040] The triggering component includes a trigger block 5 sleeved on the rotating shaft 2. The triggering part 41 is a protrusion integrally formed with the trigger block 5. The trigger block 5 can be block-shaped, which results in a longer product service life and greater stability.

[0041] The drive rod includes a rotating part 31, which is rotatably fixed to one end of the drive rod away from the micro switch 31. The micro switch 31 can be a drive rod with the rotating part 31, or it can be a micro switch 31 with only the drive rod (see attached diagram). Figure 5 ).

[0042] An actuator includes a housing, in which a motor, a worm gear, and a worm 12 are disposed. The motor drives the rotation of the worm gear and the worm 12. A sliding groove 13 is formed on the worm. The actuator is characterized in that the housing is equipped with the aforementioned electric actuator misconnection protection structure.

[0043] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

Claims

1. A common type of electric actuator power line phase sequence misconnection protection structure, comprising a mounting base and a trigger assembly, wherein the trigger assembly includes a rotating shaft rotating on the mounting base, and the rotating shaft is provided with a driving part that cooperates with an annular protrusion and a trigger assembly that triggers a micro switch, characterized in that: The mounting seat is provided with a micro switch assembly, and the micro switch assembly is provided with at least four micro switches; the trigger assembly is provided with trigger portions corresponding to the micro switches, and the trigger portions are distributed in a staggered manner in the circumferential direction of the rotating shaft.

2. The common type power supply line phase sequence error protection structure of electric actuator according to claim 1, characterized in that: The micro switch assembly comprises a first micro switch group and a second micro switch group, each micro switch of the micro switch assembly is provided with a guide piece of a trigger contact, the guide pieces of the micro switches of the first micro switch group and the second micro switch group are opposite to each other, and at least two micro switches are provided in each group.

3. The common type power supply line phase sequence error protection structure of electric actuator according to claim 2, characterized in that: One of the first micro switch group and the second micro switch group comprises a valve closing over-torque fault switch and a valve opening phase sequence fault switch, and the other of the first micro switch group and the second micro switch group comprises a valve opening over-torque fault switch and a valve closing phase sequence fault switch, and at least one of the valve closing over-torque fault switch, the valve opening phase sequence fault switch, the valve opening over-torque fault switch and the valve closing phase sequence fault switch is provided.

4. The common type power supply line phase sequence error protection structure of electric actuator according to claim 3, characterized in that: The trigger assembly comprises a first trigger structure and a second trigger structure, the trigger portions on the first trigger structure and the second trigger structure are arranged in a radial symmetry along the rotating shaft, and the trigger portions on the first trigger structure and the second trigger structure are arranged in a staggered manner in the circumferential direction of the rotating shaft.

5. A general type electric actuator power supply line phase sequence error protection structure according to claim 4, characterized in that: The trigger portions on the first trigger structure and the second trigger structure correspond to the driving rods of the first micro switch group and the second micro switch group in pairs respectively, the stroke of the trigger portion corresponding to the valve opening phase sequence fault switch is shorter than the stroke of the trigger portion corresponding to the valve closing over-torque fault switch, and the stroke of the trigger portion corresponding to the valve closing phase sequence fault switch is shorter than the stroke of the trigger portion corresponding to the valve opening over-torque fault switch.

6. The common power supply line phase sequence error protection structure of electric actuators as claimed in claim 1, characterized in that: The trigger assembly comprises a trigger piece fixed to the rotating shaft, and the trigger portions are protrusions integrally formed with the trigger piece.

7. A general type power line phase sequence error protection structure for electric actuators as claimed in claim 6, characterized in that: The trigger piece is fixedly connected with a trigger member, and the trigger portions are formed on the trigger member.

8. The common power supply line phase sequence error protection structure of electric actuators as claimed in claim 1, characterized in that: The trigger assembly comprises a trigger block sleeved on the rotating shaft, and the trigger portions are protrusions integrally formed with the trigger block.

9. The common type power supply line phase sequence error protection structure of electric actuator according to claim 5, characterized in that: The driving rod comprises a rotating portion rotatably fixed to one end of the driving rod away from the micro switch.

10. An actuator comprising a housing, a motor, a worm gear and a worm provided in the housing, the motor driving rotation of the worm gear and the worm, the worm having a sliding groove formed therein, characterized in that, The housing is provided with the electric actuator error connection protection structure according to any one of claims 1-9.

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