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

Abstract

The invention discloses a common electric actuator power line phase sequence misconnection protection structure and an actuator, the common 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, and the rotating shaft is provided with a driving part matched with an annular protrusion and a trigger assembly for triggering a microswitch. 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 device has the following advantages and effects that when phase sequence connection of an input power supply or a control line is wrong, prompting can be carried out, an actuator can be protected, and meanwhile normal use is not affected.

Description

Technical Field

[0001] The invention relates to the field of electric actuators, and more specifically, to a common electric actuator power line phase sequence misconnection protection structure and an actuator. Background Art

[0002] The valve electric actuator is a device that can automatically control the opening and closing of the valve. It can achieve precise control of fluid flow, pressure and other parameters.

[0003] The electric valve actuator on the market includes a motor, a protection structure, a turbine and a worm. The motor drives the rotation of the turbine and worm, and the worm is connected to the valve drive shaft to control the opening and closing of the valve. When the turbine switches between forward and reverse rotation, the worm that cooperates with it will move to a certain extent in the axial direction. The protection structure is a protection device that cuts off the motor when the worm moves excessive torque. An annular protrusion is protruded on one end of the worm, and a sliding groove is formed between the two annular protrusions. The protection structure includes a trigger assembly and a micro switch. The trigger assembly is partially located in the sliding groove. When the worm moves excessively, the annular protrusion will drive the trigger assembly to trigger the micro switch to open and close the electric actuator.

[0004] When wiring the electric actuator, if the power line and the control line are connected reversely, the trigger component will trigger the wrong micro switch and the electric actuator will not be able to cut off the power. The electric actuator will continue to work without being able to cut off the power until the motor and other transmission accessories of the electric actuator are damaged. Summary of the invention

[0005] The invention provides a phase sequence wrong connection protection structure for power lines of an electric actuator, aiming to solve the problem that the electric actuator in the prior art does not have a wrong connection protection structure.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a common electric actuator power line phase sequence wrong connection protection structure, including a mounting seat and a trigger assembly, the trigger assembly includes a rotating shaft rotated on the mounting seat, the rotating shaft is provided with a driving part that cooperates with an annular protrusion and a trigger assembly that triggers a micro switch, 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 a trigger part corresponding to the micro switch, and the trigger part is staggeredly distributed in the circumferential direction of the rotating shaft.

[0007] The present invention is further configured as follows: the micro switch assembly comprises a micro switch group 1 and a micro switch group 2, each micro switch of the micro switch assembly is provided with a guide plate of a trigger contact, the micro switch guide plates on the micro switch group 1 and the micro switch group 2 face in opposite directions, and each group is provided with at least two micro switches.

[0008] The present invention is further configured as follows: one of the microswitch group 1 and the microswitch group 2 includes a valve closing over-torque fault switch and a valve opening phase sequence fault switch, and the other of the microswitch group 1 and the microswitch group 2 includes 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, valve opening phase sequence fault switch, valve opening over-torque fault switch and valve closing phase sequence fault switch is provided.

[0009] The present invention is further configured as follows: the trigger assembly includes a trigger structure 1 and a trigger structure 2, the trigger parts on the trigger structure 1 and the trigger structure 2 are radially symmetrically arranged along the rotation axis, and the trigger parts on the trigger structure 1 and the trigger structure 2 are staggered in the circumferential direction of the rotation axis.

[0010] The present invention is further configured as follows: the trigger parts on the trigger structure 1 and the trigger structure 2 correspond to the driving rods of the micro switch group 1 and the micro switch group 2, respectively; the stroke of the trigger part corresponding to the valve opening phase sequence fault switch is shorter than the stroke of the trigger part corresponding to the valve closing over-torque fault switch; the stroke of the trigger part corresponding to the valve closing phase sequence fault switch is shorter than the stroke of the trigger part corresponding to the valve opening over-torque fault switch; The present invention is further configured as follows: the trigger assembly includes a trigger sheet fixed to the rotating shaft, and the trigger portion is a protrusion integrally formed with the trigger sheet.

[0011] The present invention is further configured as follows: a trigger piece is fixedly connected to the trigger sheet, and the trigger portion is formed on the trigger piece.

[0012] The present invention is further configured as follows: the trigger assembly comprises a trigger block sleeved on the rotating shaft, and the trigger portion is a protrusion integrally formed with the trigger block.

[0013] The present invention is further configured as follows: the driving rod comprises a rotating portion, and the rotating portion is rotatably fixed to an end of the driving rod away from the micro switch.

[0014] An actuator comprises a housing, wherein a motor, a turbine and a worm are arranged in the housing, wherein the motor drives the turbine and the worm to rotate, and a sliding groove is formed on the worm. The actuator is characterized in that the housing is provided with an electric actuator misconnection protection structure as described in any one of claims 1 to 9.

[0015] The present invention has the following effects: by arranging staggered contact ends, there is a difference in the order of contact between the contact ends and the micro switches, ensuring that electric execution and disconnection can still be performed when wrong connections are made. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a side structural diagram of an embodiment of the present invention; Figure 2A schematic diagram of the structure of a trigger sheet according to an embodiment of the present invention; Figure 3 A top view of an embodiment of the present invention; Figure 4 It is a structural diagram of a worm in an electric actuator that cooperates with the present invention; Figure 5 The three-dimensional diagram of two embodiments of the micro switch of the present invention Figure 6 It is a three-dimensional diagram of an embodiment of the present invention equipped with a trigger block.

[0017] In the figure: 1. mounting seat; 12. worm; 13. sliding groove; 2. rotating shaft; 3. micro switch assembly; 31. micro switch; 31. rotating part; 4. trigger sheet; 41. trigger part; 5. trigger block; 6. valve closing over-torque fault switch; 7. valve opening phase sequence fault switch; 8. valve opening over-torque fault switch; 9. valve closing phase sequence fault switch. DETAILED DESCRIPTION

[0018] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the 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 "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0020] Reference Figures 1 to 6 The embodiments of the present invention are further described.

[0021] A common 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 rotated 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 a micro switch 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, and the trigger assembly is provided with a trigger part 41 corresponding to the micro switch 31, the trigger part 41 is staggeredly distributed in the circumferential direction of the rotating shaft 2, and four micro switches 31 are provided. Compared with the prior art, at least two micro switches 31 are added, and when the line is connected reversely, the added micro switch 31 can still cut off the motor, effectively ensuring the protection of the actuator itself when the line is connected incorrectly.

[0022] The micro switch 31 assembly 3 includes a micro switch 31 group 1 and a micro switch 31 group 2. Each micro switch 31 of the micro switch 31 assembly 3 is provided with a guide piece for triggering contacts. The guide pieces of the micro switches 31 on the micro switch 31 group 1 and the micro switch 31 group 2 face opposite directions, and each group is provided with at least two micro switches 31. The micro switches 31 are divided into two groups and are stacked and fixed on the mounting base 1, and the guide pieces of the two groups of micro switches 31 are opposite. When the worm 12 rotates forward too much or reverses too much, the rotating shaft 2 rotates forward or reverses accordingly, which can trigger the two groups of micro switches 31 respectively. Each group of micro switches 31 is provided with at least two, which ensures that the micro switches 31 can be triggered to cut off the motor when the wires are connected correctly or reversely.

[0023] One of the microswitch group 1 and the microswitch group 2 includes a valve closing over-torque fault switch 6 and a valve opening phase sequence fault switch 7, and the other of the microswitch group 1 and the microswitch group 2 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.

[0024] The trigger assembly includes a trigger structure 1 and a trigger structure 2. The trigger parts 41 on the trigger structure 1 and the trigger structure 2 are radially symmetrically arranged along the rotating shaft 2. The trigger parts 41 on the trigger structure 1 and the trigger structure 2 are staggered in the circumferential direction of the rotating shaft 2.

[0025] The trigger parts 41 on the trigger structure 1 and the trigger structure 2 correspond to the driving rods of the micro switch 31 group 1 and the micro switch 31 group 2 respectively. The stroke of the trigger part 41 corresponding to the valve opening phase sequence fault switch 7 is shorter than the stroke of the trigger part 41 corresponding to the valve closing over-torque fault switch 6. The stroke of the trigger part 41 corresponding to the valve closing phase sequence fault switch 9 is shorter than the stroke of the trigger part 41 corresponding to the valve opening over-torque fault switch 8. For efficiency and structural considerations, four micro switches 31 can be used in actual use, namely, 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 9 are each provided with one. For the convenience of description, the following text uses 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 being stacked on the mounting base 1 in order from top to bottom for explanation. In actual use, the micro switches 31 group one and the micro switches 31 group two can be adjusted up and down, and the switches in the group can be adjusted up and down, and then the trigger part 41 can be adjusted accordingly.

[0026] When the electric actuator is connected to the wrong power line or control line when opening the valve; (the closing valve over-torque fault switch 6, the opening valve phase sequence fault switch 7, the opening valve over-torque fault switch 8 and the closing valve phase sequence fault switch 9 are stacked from top to bottom) 1. When the valve opening button is pressed in the remote control box or the central control room, the electric actuator will run in the valve closing direction. When the trigger component presses the valve opening phase sequence fault switch 7, the power supply will be cut off to protect the electric actuator, and a set of non-contact valve opening phase sequence fault signals will be output to the control box or the central control room. At this time, you only need to reconnect the power cord or control cord correctly, the electric actuator will operate normally, and the fault signal will automatically go out.

[0027] 2. When the valve closing button is pressed in the remote control box or the central control room, the electric actuator will run in the direction of opening the valve. When the trigger component presses the valve closing phase sequence fault switch 9, the power supply will be cut off to protect the electric actuator, and a set of non-contact valve closing phase sequence fault signals will be output to the control box or the central control room. At this time, you only need to reconnect the power cord or control cord correctly, the electric actuator will operate normally, and the fault signal will automatically go out.

[0028] When the electric actuator is connected to the correct power line or control line when opening the valve; 1. When the electric actuator opens the valve normally, the electric actuator has excessive torque due to the medium in the pipeline or other reasons. At this time, the contact part with a relatively short stroke in the trigger component will press the valve closing phase sequence fault switch 9 2 seconds in advance, and output a set of valve closing phase sequence fault signals. After 2 seconds, the contact part with a relatively long stroke in the trigger component will press the valve opening over-torque fault switch 8, which will cut off the power supply to protect the electric actuator and output a set of valve opening over-torque fault signals. At the same time, there will be a valve closing phase sequence fault display and a valve opening over-torque fault display in the control box or central control room.

[0029] 2. When the electric actuator closes the valve normally, the electric actuator has excessive torque due to the medium in the pipeline or other reasons. At this time, the contact part with a relatively short stroke in the trigger component will press the valve opening phase sequence fault switch 7 2 seconds in advance, and output a group of valve opening phase sequence fault signals. 2 seconds later, the contact part with a relatively long stroke in the trigger component will press the valve closing over-torque fault switch 6, which will cut off the power supply to protect the electric actuator and output a group of valve closing over-torque fault signals. At the same time, there will be an open valve phase sequence fault display and a valve closing over-torque fault display in the control box or central control room.

[0030] The trigger assembly includes a trigger sheet 4 fixed to the rotating shaft 2, and the trigger portion 41 is a protrusion formed integrally with the trigger sheet 4. A sheet-shaped trigger assembly can be used according to the usage, which is more cost-saving and convenient to install (see attached Figure 1 ).

[0031] The trigger sheet 4 is fixedly connected with a trigger member, and the trigger member is formed with the trigger portion 41. This structure allows the second trigger sheet 4 to be staggered directly on the trigger sheet 4, which saves costs, is convenient for adjustment, and is easy to install.

[0032] The trigger assembly includes a trigger block 5 sleeved on the rotating shaft 2. The trigger portion 41 is a protrusion formed integrally with the trigger block 5. A block-shaped trigger block 5 can be used, which has a longer service life and is stable.

[0033] The driving rod comprises a rotating part 31, and the rotating part 31 is rotatably fixed to an end of the driving rod away from the micro switch 31. The micro switch 31 can be a driving rod with a rotating part 31 according to the situation, or a micro switch 31 with only a driving rod can be selected (see attached Figure 5 ).

[0034] An actuator comprises a housing, wherein a motor, a turbine and a worm 12 are arranged in the housing, wherein the motor drives the turbine and the worm 12 to rotate, and a sliding groove 13 is formed on the worm. The actuator is characterized in that the housing is provided with an electric actuator misconnection protection structure as described in any one of claims 1 to 9.

[0035] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. A common type of electric actuator power line phase sequence misconnection protection structure, comprising a mounting seat and a trigger assembly, the trigger assembly comprising a rotating shaft rotating on the mounting seat, the rotating shaft is provided with a driving part matching an annular protrusion and a trigger assembly for triggering a micro switch, wherein: 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 a trigger part corresponding to the micro switch, and the trigger parts are staggeredly distributed in the circumferential direction of the rotating shaft.

2. According to claim 1, a common electric actuator power line phase sequence wrong connection protection structure is characterized by: The micro switch assembly includes a micro switch group 1 and a micro switch group 2. Each micro switch of the micro switch assembly is provided with a guide plate for a trigger contact. The micro switch guide plates on the micro switch group 1 and the micro switch group 2 face in opposite directions, and each group is provided with at least two micro switches.

3. According to claim 2, a common electric actuator power line phase sequence wrong connection protection structure is characterized by: One of the microswitch group 1 and the microswitch group 2 includes a valve closing over-torque fault switch and a valve opening phase sequence fault switch, and the other of the microswitch group 1 and the microswitch group 2 includes 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, valve opening phase sequence fault switch, valve opening over-torque fault switch and valve closing phase sequence fault switch is provided.

4. According to claim 3, a common electric actuator power line phase sequence wrong connection protection structure is characterized by: The trigger assembly includes a trigger structure 1 and a trigger structure 2. The trigger parts on the trigger structure 1 and the trigger structure 2 are arranged radially symmetrically along the rotation axis, and the trigger parts on the trigger structure 1 and the trigger structure 2 are arranged alternately in the circumferential direction of the rotation axis.

5. According to claim 4, a common electric actuator power line phase sequence wrong connection protection structure is characterized by: The trigger parts on the trigger structure one and the trigger structure two correspond one to one with the driving rods of the microswitch group one and the microswitch group two respectively, and the trigger part stroke corresponding to the valve opening phase sequence fault switch is shorter than the trigger part stroke corresponding to the valve closing over-torque fault switch, and the trigger part stroke corresponding to the valve closing phase sequence fault switch is shorter than the trigger part stroke corresponding to the valve opening over-torque fault switch.

6. According to claim 1, a common electric actuator power line phase sequence wrong connection protection structure is characterized by: The trigger assembly comprises a trigger sheet fixed to the rotating shaft, and the trigger portion is a protrusion integrally formed with the trigger sheet.

7. A common electric actuator power line phase sequence wrong connection protection structure according to claim 6, characterized in that: The trigger sheet is fixedly connected with a trigger piece, and the trigger part is formed on the trigger piece.

8. According to claim 1, a common electric actuator power line phase sequence wrong connection protection structure is characterized by: The trigger assembly comprises a trigger block sleeved on the rotating shaft, and the trigger portion is a protrusion integrally formed with the trigger block.

9. According to claim 2, a common electric actuator power line phase sequence wrong connection protection structure is characterized by: The driving rod comprises a rotating portion, and the rotating portion is rotatably fixed to an end of the driving rod away from the micro switch.

10. An actuator, comprising a housing, wherein a motor, a turbine and a worm are arranged in the housing, wherein the motor drives the turbine and the worm to rotate, and a sliding groove is formed on the worm, characterized in that: The housing is provided with a common electric actuator power line phase sequence misconnection protection structure as described in any one of claims 1 to 9.

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