Rotary three-position switch operating mechanism

Abstract

The present invention relates to a rotary three-position switch operating mechanism, and belongs to the field of ring main unit technologies. This solution includes a gear set, configured to achieve switch of a rotary three-position switch between three positions, where the gear set includes a first driving gear and a second driving gear that are coaxially disposed, and further includes a first driven gear only meshing with the first driving gear and configured to switch between the intermediate position and the isolating position, and a second driven gear only meshing with the second driving gear and configured to switch between the intermediate position and the grounding position; and when the two driving gears rotate counterclockwise, the first driving gear meshes with the first driven gear to drive the switch from the intermediate position to the isolating position, and when the two driving gears rotate clockwise, the second driving gear meshes with the second driven gear to drive the switch from the intermediate position to the grounding position. This solution is used for resolving a problem in the related art that a switch process is complex because another auxiliary manner is needed to achieve switch when the three-position switch switches between three positions through gear transmission.

Description

TECHNICAL FIELD

[0001] The present invention relates to a rotary three-position switch operating mechanism, and belongs to the field of ring main unit technologies.BACKGROUND

[0002] A three-position switch operating mechanism is an important device for a three-position switch in a gas-insulated metal-enclosed switchgear to implement three functions, namely, opening, isolating closing, and grounding closing. Most of existing three-position switch operating mechanisms in a ring main unit are equipped with an electric apparatus and a manual operation function. However, when three states, namely, opening, isolating, and grounding, are implemented by using the electric apparatus, other devices are needed. An intermediate implementation process and a structural design are complex.

[0003] Chinese Patent Application with the Publication No. CN102543551A discloses a three-position switch operating mechanism. In this solution, a display rotating rod apparatus in which a rotation slot is processed on a side of a circular rotating rod shaft is provided. When an opening operation or a closing operation of an isolating switch or a grounding switch is performed, as a motor drives rotation of a main shaft of a lead screw, two guide shafts mounted on a screw nut assembly component perform back and forth linear motion. One end of the guide shaft linearly slides in the rotation slot of the display rotating rod apparatus, and the linear motion of the guide shaft is converted into rotation of a display disk by the rotating rod shaft. In a whole stroke of the three-position switch between a grounding closing position and an isolating closing position, a number of rotations of the main shaft of the lead screw is converted into 1 / 4 of a number of rotations of the display disk. In cooperation with a switch status symbol set on an operation panel, a position of the three-position switch can be accurately displayed in real time. In this solution, position switching can be achieved only by using other auxiliary components such as a rotation slot, a display disk, and a switch status symbol in the whole stroke of the three-position switch between the grounding closing position and the isolating closing position, and a structure and a switch process are complex.

[0004] Chinese Patent Application with the Publication No. CN112002570A discloses a three-position switch operating mechanism. The solution includes a motor module, a gear transmission module, a manual input module, and a position limiting module. The motor module can drive, by using the gear transmission module, the position limiting module to move. The manual input module can drive, by using the gear transmission module, the position limiting module to move. The position limiting module moves and limits a position at a reference opening position, an isolating closing position, or a grounding closing position. In this solution, the three-position switch needs to drive, by using the gear transmission module, the position limiting module to move to achieve a position switch function. A switching process is complex, and a complex structure is used, resulting in an increase in manufacturing costs.SUMMARY

[0005] An objective of the present invention is to provide a rotary three-position switch operating mechanism, to resolve a problem in the related art that a switch process of functions of opening, isolating, and grounding is complex because other auxiliary manners are needed to achieve switch between an opening state, a isolating state, and a grounding state when a three-position switch achieves the three states through gear transmission.

[0006] To achieve the foregoing objective, a solution of the present invention includes: a rotary three-position switch operating mechanism, including a gear set configured for a three-position switch to switch between an intermediate position, an isolating position, and a grounding position, where the gear set includes a first driving gear and a second driving gear that are coaxially disposed, and further includes: a first driven gear only meshing with the first driving gear and configured to switch between the intermediate position and the isolating position, and a second driven gear only meshing with the second driving gear and configured to switch between the intermediate position and the grounding position; and when the first driving gear and the second driving gear rotate counterclockwise, the first driving gear meshes with the first driven gear to drive the three-position switch to switch from the intermediate position to the isolating position, and when the first driving gear and the second driving gear rotate clockwise, the second driving gear meshes with the second driven gear to drive the three-position switch to switch from the intermediate position to the grounding position.

[0007] The first driving gear and the second driving gear are coaxially disposed. The first driving gear meshes with the first driven gear to rotate clockwise, so that the three-position switch switches from the intermediate position to the isolating position. The second driving gear meshes with the second driven gear to rotate clockwise, so that the three-position switch switches from the intermediate position to the grounding position. In the present invention, an intermediate process and a structural design of direct switch between the three functions of the three-position switch through gear transmission are simple and reliable, and switch between the three functions does not need another auxiliary manner or means, thereby reducing manufacturing and processing costs and improving production efficiency.

[0008] Further, the first driving gear and the second driving gear are both of an incomplete gear structure, and a toothed part and a non-toothed part of the two driving gears are staggered.

[0009] The two driving gears are both incomplete gears, and geared parts of the two driving gears and non-geared parts of the two driving gears are staggered. A structure of the incomplete gear is simple and easy to be processed. In addition, through a simple structural design of staggered arrangement, when the two driving gears simultaneously rotate, only one driven gear can be driven to rotate, thereby ensuring reliability of switch of the three-position switch between the three positions.

[0010] Further, when the three-position switch is at the intermediate position, the first driven gear meshes with a start end of the first driving gear rotating counterclockwise, and the second driven gear meshes with a start end of the second driving gear rotating clockwise.

[0011] When the three-position switch is at the intermediate position, the first driven gear meshes with a start end of the first driving gear that rotates clockwise, and the second driven gear meshes with a start end of the second driving gear that rotates counterclockwise; and because the two driving gears are both incomplete gears, and the two driven gears respectively mesh with start ends of the geared parts in a rotation direction in which functions of the driving gears are achieved, to facilitate distinguishing and controlling a start position and a stop position of a contact point when the three-position switch switches between the three positions.

[0012] Further, when the first driving gear rotates counterclockwise from the intermediate position to the isolating position, the first driven gear meshes with an other end of the toothed part of the first driving gear.

[0013] When the first driving gear rotates clockwise from the intermediate position to the grounding position, the first transmission gear meshes with an other end of the first driving gear, to facilitate distinguishing between and controlling the start position and the a stop position of the a contact point when the three-position switch switches between the three positions.

[0014] Further, when the second driving gear rotates clockwise from the intermediate position to the grounding position, the second driven gear meshes with an other end of the toothed part of the second driving gear.

[0015] This facilitates distinguishing and controlling a start position and a stop position of a contact point when the three-position switch switches between the three positions.

[0016] Further, the first driven gear and the second driven gear are respectively connected to a main shaft of the three-position switch by using an input shaft. When the first driving gear drives the first driven gear to rotate clockwise, the main shaft of the three-position switch rotates clockwise, so that the three-position switch switches from the intermediate position to the isolating position. When the second driving gear drives the second driven gear to rotate counterclockwise, the main shaft of the three-position switch rotates counterclockwise, so that the three-position switch switches from the intermediate position to the grounding position.

[0017] This apparatus can achieve that one motor drives two input shafts simultaneously to achieve respective rotation within specific angle ranges, and further drive the main shaft of the switch to rotate, thereby achieving switch of the switch between the three positions.

[0018] Further, the first driving gear and the second driving gear are coaxially connected with an output end of the motor by using an output shaft. One end of the output shaft is connected to an output end of the motor, and an other end of the output shaft is separately disposed through an axial center of the first driving gear and the second driving gear.

[0019] Further, a manual operation apparatus is included, configured to manually switch between the three positions of the three-position switch, where the manual operation apparatus includes a first operation shaft connected to the output shaft and configured to drive the first driving gear and the second driving gear to rotate counterclockwise by using the output shaft, to switch the three-position switch from the intermediate position to the isolating position, and further includes a second operation shaft configured to drive, by using the output shaft, the first driving gear and the second driving gear to rotate clockwise, to cause the three-position switch to switch from the intermediate position to the grounding position.

[0020] Further, a full gear is disposed on the output shaft, and the first operation shaft drives the first driving gear and the second driving gear to rotate counterclockwise by meshing with the full gear.

[0021] Further, a limiting plate is included, where limiting holes configured to limit a motion range of the first operation shaft and a motion range of the second operation shaft are separately provided on the limiting plate; and a baffle is further included, where when a manual operation handle is inserted into the first operation shaft and the second operation shaft, the baffle is configured to be pressed to enable a pin shaft on the baffle to extend into a corresponding limiting hole.BRIEF DESCRIPTION OF THE DRAWINGS

[0022] FIG. 1 is a three-dimensional schematic structural diagram of an electric apparatus of a three-position switch operating mechanism according to the present invention; FIG. 2 is a schematic structural diagram of a gear set according to the present invention; FIG. 3 is a schematic structural diagram of a gear set when an operating mechanism is at an intermediate position according to the present invention; FIG. 4 is a schematic structural diagram of a gear set when an operating mechanism is at a first closing position according to the present invention; FIG. 5 is a schematic structural diagram of a gear set when an operating mechanism is at a second closing position according to the present invention; FIG. 6 is a schematic structural diagram illustrating an operating mechanism at an intermediate position with a handle being inserted through a manual operation according to the present invention; and FIG. 7 is a schematic structural diagram illustrating an operating mechanism at a first closing position without a handle being inserted through a manual operation according to the present invention.

[0023] In the drawings: 1. motor; 2. front cover plate; 31. first input shaft; 32. second input shaft; 41. first operation shaft; 42. second operation shaft; 51. first driven gear; 52. first driving gear; 53. second driven gear; 54. second driving gear; 55. third gear; 56. fourth gear; 6. limiting plate; 62. second arc-shaped hole; 63. first arc-shaped hole; 7. second operation shaft baffle; 71. first operation shaft baffle; 72. second pin shaft; 73. first pin shaft; and 8. return spring.DETAILED DESCRIPTION

[0024] To make objectives, technical solutions, and advantages of the present invention clearer, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0025] An embodiment of a rotary three-position switch operating mechanism is described below.

[0026] A rotary three-position switch operating mechanism of the present invention shown in FIG. 1 to FIG. 7, including: a bidirectional clutching motor 1, a front cover plate 2, a first input shaft 31, a second input shaft 32, a first operation shaft 41, a second operation shaft 42, a first driven gear 51, a first driving gear 52, a second driven gear 53, a second driving gear 54, a third gear 55, a fourth gear 56, and a limiting plate 6. The motor 1 and the limiting plate 6 are fixed on the front cover plate 2. As shown in FIG. 2, the first driven gear 51 and the second driven gear 53 are respectively fixed on the first input shaft 31 and the second input shaft 32, the first driving gear 52, the second driving gear 54, and the fourth gear 56 are simultaneously fixed on an output shaft of the motor, and the second operation shaft 42 is further disposed on the motor, to directly manually drive the output shaft of the motor to rotate. The third gear 55 is fixed on the first operation shaft 41. During working, the first driven gear 51 meshes with the first driving gear 52, the second driven gear 53 meshes with the second driving gear 54, and the third gear 55 meshes with the fourth gear 56. The first driving gear 52 and the second driving gear 54 are two incomplete gears, and other gears are all complete gears. Two baffles are respectively mounted on the first operation shaft 41 and the second operation shaft 42, and a pin shaft is correspondingly fixedly disposed on each of the baffles and separately matches a corresponding arc-shaped hole on the limiting plate 6, to achieve position limit locking on the first operation shaft 41 and the second operation shaft 42. Two return springs are respectively mounted on the first operation shaft 41 and the second operation shaft 42, and are located between the corresponding limiting plate and baffle; and the motor may drive the output shaft of the motor clockwise to rotate, or may drive the output shaft of the motor counterclockwise to rotate, but the output shaft of the motor cannot drive the motor to rotate.

[0027] Performing an electric operation from an intermediate position (an opening position) to a first closing position (grounding position): Positions of the first driven gear 51, the first driving gear 52, the second driven gear 53, and the second driving gear 54 of an electric apparatus of a rotary three-position switch operating mechanism in the present invention are shown in FIG. 3 when the three-position switch is at the intermediate position. The first driven gear 51 meshes with a start end of the first driving gear 52 rotating counterclockwise, and the second driven gear 53 meshes with a start end of the second driving gear 54 rotating clockwise; and because the first driving gear 52 and the second driving gear 54 are two incomplete gears, the start end of the first driving gear 52 is a start end of a toothed sector of the first driving gear 52 rotating counterclockwise, and the start end of the second driving gear 54 is a start end of a toothed sector of the second driving gear 54 rotating clockwise. In a process of grounding closing, the motor 1 rotates clockwise, and drives the output shaft of the motor and the first driving gear 52, the second driving gear 54, and the fourth gear 56 on the output shaft of the motor to rotate clockwise. The second driving gear 54 rotates clockwise by a specific angle to start to mesh with the second driven gear 53, and drives the second driven gear 53 to rotate counterclockwise, and drives a main shaft of the switch to rotate counterclockwise by a specific angle to reach a grounding closing position via the second input shaft 32, so that a contact point is switched, and the motor stops. In this case, positions of the first driven gear 51, the first driving gear 52, the second driven gear 53, and the second driving gear 54 of the electric apparatus are shown in FIG. 4. The second driven gear 53 meshes with an other end of the toothed part of the second driving gear 54. Although the first driven gear 51 and the first driving gear 52 are also a pair of meshed gears, it can be seen from FIG. 3 and FIG. 4 that the motor rotates clockwise, and because the first driving gear 52 is an incomplete gear, the first driven gear 51 is not driven to rotate in this case. Therefore, rotation of the first input shaft 31 is not affected, and an action at another closing position (an isolating position) of the switch is not affected.

[0028] Performing an electric operation from the first closing position to the intermediate position: Positions of the first driven gear 51, the first driving gear 52, the second driven gear 53, and the second driving gear 54 of an electric apparatus of a rotary three-position switch operating mechanism in the present invention are shown in FIG. 4 when the three-position switch is at the first closing position. In a process of opening at the first closing position, namely, the grounding position, the motor 1 rotates counterclockwise, driving the output shaft of the motor and the first driving gear 52, the second driving gear 54, and the fourth gear 56 on the output shaft of the motor to rotate counterclockwise. Because the second driving gear 54 and the second driven gear 53 are still in a meshed state at the first closing position, the second driving gear 54 directly drives the second driven gear 53 to rotate clockwise, to reach the opening position (namely, the intermediate position). The contact point is switched, the motor stops, and each gear returns to an initial position shown in FIG. 3. In this process, because a working position of the first driving gear 52 relative to the first driven gear 51 is always a non-toothed area, the first driven gear 51 is not driven to rotate.

[0029] Performing an electric operation from the intermediate position (the opening position) to the second closing position (the isolating position): Positions of the first driven gear 51, the first driving gear 52, the second driven gear 53, and the second driving gear 54 of an electric apparatus of a rotary three-position switch operating mechanism in the present invention are shown in FIG. 3 when the three-position switch is at the intermediate position. In a process of closing, the motor 1 rotates counterclockwise, and drives the output shaft of the motor and the first driving gear 52, the second driving gear 54, and the fourth gear 56 on the output shaft of the motor to rotate counterclockwise. The first driving gear 52 rotates counterclockwise by a specific angle to start to mesh with the first driven gear 51, and drives the first driven gear 51 to rotate clockwise, and drives the main shaft of the switch to rotate clockwise by a specific angle to reach the isolating closing position via the first input shaft 31, so that the contact point is switched, and the motor 1 stops. In this case, positions of the first driven gear 51, the first driving gear 52, the second driven gear 53, and the second driving gear 54 of the electric apparatus are shown in FIG. 5. The first driven gear 51 meshes with an other end of the toothed part of the first driving gear 52. Although the second driven gear 53 and the second driving gear 54 are also a pair of meshed gears, it can be seen from FIG. 3 and FIG. 5 that the motor 1 rotates counterclockwise, and because the second driving gear 54 is an incomplete gear, the second driven gear 53 is not driven to rotate in this case. Therefore, rotation of the second input shaft 32 is not affected, and an action at another closing position (a grounding position) of the switch is not affected.

[0030] Performing an electric operation from the second closing position to the intermediate position: Positions of the first driven gear 51, the first driving gear 52, the second driven gear 53, and the second driving gear 54 of an electric apparatus of a rotary three-position switch operating mechanism in the present invention are shown in FIG. 5 when the three-position switch is at the second closing position. In a process of opening, the motor 1 rotates clockwise, and drives the output shaft of the motor and the first driving gear 52, the second driving gear 54, and the fourth gear 56 on the output shaft of the motor to rotate clockwise. Because the first driving gear 52 and the first driven gear 51 are still at a meshed position when the rotary three-position switch operating mechanism is at the second closing position, the first driving gear 52 directly drives the first driven gear 51 to rotate, to reach the opening position (namely, an intermediate position). The contact point is switched, the motor stops, and each gear returns to the initial position shown in FIG. 3. In this process, because a working position of the second driving gear 54 relative to the second driven gear 53 is always a non-toothed area, the second driven gear 53 is not driven to rotate.

[0031] To ensure that the mechanism can switch between the electric operation and a manual operation at any position, the following describes in detail a process in which the manual operation is performed on the electric apparatus from the intermediate position to the first closing position / the second closing position and then the electric operation is performed from the first closing position / the second closing position to the intermediate position, and a process in which the electric operation is performed on the electric apparatus from the intermediate position to the first closing position / the second closing position and then the manual operation is performed from the first closing position / the second closing position to the intermediate position.

[0032] Performing the manual operation from the intermediate position (the opening position) to the first closing position (the grounding position), and performing the electric operation from the first closing position to the intermediate position: During the manual operation performed from the intermediate position to the first closing position, a handle is inserted into the second operation shaft 42, to push a second operation shaft baffle 7 to perform an axial movement on the second operation shaft 42, to reach a position shown in FIG. 6. As shown in FIG. 6, the second pin shaft 72 enters the second arc-shaped hole 62 in the limiting plate, and is locked with the second operation shaft 42. In this case, the second operation shaft 42 can only rotate clockwise to operate toward the first closing position, thereby avoiding a safety hazard caused by a user performing counterclockwise rotation to operate toward another closing position. Rotation of the second operation shaft 42 clockwise also drives the output shaft of the motor to rotate clockwise. A subsequent closing process is exactly the same as the foregoing process of the electric operation from the intermediate position to the first closing position. In this case, a process of the electric operation from the first closing position to the intermediate position is also exactly the same as the foregoing process, and details are not described again.

[0033] Performing the electric operation from the intermediate position (the opening position) to the first closing position (the grounding position), and performing the manual operation from the first closing position to the intermediate position: A process of the electric operation from the intermediate position to the first closing position is described in detail above. After the first closing position is reached, positions of the gears are shown in FIG. 4, and position of the second operation shaft baffle 7 is shown in FIG. 7. In this case, the manual operation is performed. The handle is inserted into the second operation shaft 42. When the handle is inserted, the handle pushes the second operation shaft baffle 7, so that the second pin shaft 72 enters the second arc-shaped hole 62 on the limiting plate. The second arc-shaped hole 62 locks the second operation shaft 42. In this case, the second operation shaft 42 can only rotate counterclockwise to operate toward the intermediate position. Driven by the handle, the second operating shaft 42 rotates counterclockwise, and then an opening process is exactly the same as a process of performing electric operation from the first closing position to an intermediate position. Details are not described again.

[0034] Performing the manual operation from the intermediate position (the opening position) to the second closing position (the isolating position), and performing the electric operation from the second closing position to the intermediate position: FIG. 1 shows a position of the first operation shaft baffle 71 when the handle is not inserted into the first operation shaft 41. When the manual operation is performed from the intermediate position to the second closing position, the handle is inserted into the first operation shaft 41, to push the first operation shaft baffle 71 to perform an axial movement on the first operation shaft 41, to reach a position similar to the position of the second operation shaft baffle 7 shown in FIG. 6. In this case, the first pin shaft 73 enters the first arc-shaped hole 63 on the limiting plate, to lock the first operation shaft 41. In this case, the first operation shaft 41 can only rotate clockwise to operate toward the second closing position, thereby avoiding a safety hazard caused by the user performing counterclockwise rotation to operate toward another closing position. The first operation shaft 41 rotates clockwise, driving the third gear 55 on the first operation shaft 41 to rotate clockwise, and simultaneously driving the fourth gear 56 meshing with the third gear 55 to rotate counterclockwise. The fourth gear 56 drives the output shaft of the motor to rotate counterclockwise. In this case, because the handle is not inserted into the second operation shaft 42, the second pin shaft 72 does not enter the second arc-shaped hole 62 on the limiting plate as shown in FIG. 6, and the second operation shaft 42 is not locked. In this case, the second operation shaft 42 can rotate counterclockwise. A subsequent closing process is the same as the foregoing process of the electric operation from the intermediate position to the second closing position. In this case, a process of the electric operation from the second closing position to the intermediate position is also the same as the foregoing process, and details are not described again.

[0035] Performing the electric operation from the intermediate position (the opening position) to the second closing position (the isolating position), and performing the manual operation from the second closing position to the intermediate position: A process of the electric operation from the intermediate position to the second closing position is described in detail above. When the second closing position is reached, positions of the gears are shown in FIG. 5. In this case, if the manual operation is performed, driven by the handle, the first operation shaft 41 rotates counterclockwise, driving the third gear 55 on the first operation shaft 41 to rotate counterclockwise, and simultaneously driving the fourth gear 56 meshing with the third gear 55 to rotate clockwise. The fourth gear 56 drives the motor output shaft to rotate clockwise. A subsequent opening process is the same as the process of the electric operation from the second closing position to the intermediate position, and details are not described again.

Examples

Embodiment Construction

[0024]To make objectives, technical solutions, and advantages of the present invention clearer, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0025]An embodiment of a rotary three-position switch operating mechanism is described below.

[0026]A rotary three-position switch operating mechanism of the present invention shown in FIG. 1 to FIG. 7, including: a bidirectional clutching motor 1, a front cover plate 2, a first input shaft 31, a second input shaft 32, a first operation shaft 41, a second operation shaft 42, a first driven gear 51, a first driving gear 52, a second driven gear 53, a second driving gear 54, a third gear 55, a fourth gear 56, and a limiting plate 6. The motor 1 and the limiting plate 6 are fixed on the front cover plate 2. As shown in FIG. 2, the first driven gear 51 and the second driven gear 53 are respectively fixed on the first input shaft 31 and the second input shaft 32, the first driv...

TECHNICAL FIELD

[0001] The present invention relates to a rotary three-position switch operating mechanism, and belongs to the field of ring main unit technologies.BACKGROUND

[0002] A three-position switch operating mechanism is an important device for a three-position switch in a gas-insulated metal-enclosed switchgear to implement three functions, namely, opening, isolating closing, and grounding closing. Most of existing three-position switch operating mechanisms in a ring main unit are equipped with an electric apparatus and a manual operation function. However, when three states, namely, opening, isolating, and grounding, are implemented by using the electric apparatus, other devices are needed. An intermediate implementation process and a structural design are complex.

[0003] Chinese Patent Application with the Publication No. CN102543551A discloses a three-position switch operating mechanism. In this solution, a display rotating rod apparatus in which a rotation slot is processed on a side of a circular rotating rod shaft is provided. When an opening operation or a closing operation of an isolating switch or a grounding switch is performed, as a motor drives rotation of a main shaft of a lead screw, two guide shafts mounted on a screw nut assembly component perform back and forth linear motion. One end of the guide shaft linearly slides in the rotation slot of the display rotating rod apparatus, and the linear motion of the guide shaft is converted into rotation of a display disk by the rotating rod shaft. In a whole stroke of the three-position switch between a grounding closing position and an isolating closing position, a number of rotations of the main shaft of the lead screw is converted into 1 / 4 of a number of rotations of the display disk. In cooperation with a switch status symbol set on an operation panel, a position of the three-position switch can be accurately displayed in real time. In this solution, position switching can be achieved only by using other auxiliary components such as a rotation slot, a display disk, and a switch status symbol in the whole stroke of the three-position switch between the grounding closing position and the isolating closing position, and a structure and a switch process are complex.

[0004] Chinese Patent Application with the Publication No. CN112002570A discloses a three-position switch operating mechanism. The solution includes a motor module, a gear transmission module, a manual input module, and a position limiting module. The motor module can drive, by using the gear transmission module, the position limiting module to move. The manual input module can drive, by using the gear transmission module, the position limiting module to move. The position limiting module moves and limits a position at a reference opening position, an isolating closing position, or a grounding closing position. In this solution, the three-position switch needs to drive, by using the gear transmission module, the position limiting module to move to achieve a position switch function. A switching process is complex, and a complex structure is used, resulting in an increase in manufacturing costs.SUMMARY

[0005] An objective of the present invention is to provide a rotary three-position switch operating mechanism, to resolve a problem in the related art that a switch process of functions of opening, isolating, and grounding is complex because other auxiliary manners are needed to achieve switch between an opening state, a isolating state, and a grounding state when a three-position switch achieves the three states through gear transmission.

[0006] To achieve the foregoing objective, a solution of the present invention includes: a rotary three-position switch operating mechanism, including a gear set configured for a three-position switch to switch between an intermediate position, an isolating position, and a grounding position, where the gear set includes a first driving gear and a second driving gear that are coaxially disposed, and further includes: a first driven gear only meshing with the first driving gear and configured to switch between the intermediate position and the isolating position, and a second driven gear only meshing with the second driving gear and configured to switch between the intermediate position and the grounding position; and when the first driving gear and the second driving gear rotate counterclockwise, the first driving gear meshes with the first driven gear to drive the three-position switch to switch from the intermediate position to the isolating position, and when the first driving gear and the second driving gear rotate clockwise, the second driving gear meshes with the second driven gear to drive the three-position switch to switch from the intermediate position to the grounding position.

[0007] The first driving gear and the second driving gear are coaxially disposed. The first driving gear meshes with the first driven gear to rotate clockwise, so that the three-position switch switches from the intermediate position to the isolating position. The second driving gear meshes with the second driven gear to rotate clockwise, so that the three-position switch switches from the intermediate position to the grounding position. In the present invention, an intermediate process and a structural design of direct switch between the three functions of the three-position switch through gear transmission are simple and reliable, and switch between the three functions does not need another auxiliary manner or means, thereby reducing manufacturing and processing costs and improving production efficiency.

[0008] Further, the first driving gear and the second driving gear are both of an incomplete gear structure, and a toothed part and a non-toothed part of the two driving gears are staggered.

[0009] The two driving gears are both incomplete gears, and geared parts of the two driving gears and non-geared parts of the two driving gears are staggered. A structure of the incomplete gear is simple and easy to be processed. In addition, through a simple structural design of staggered arrangement, when the two driving gears simultaneously rotate, only one driven gear can be driven to rotate, thereby ensuring reliability of switch of the three-position switch between the three positions.

[0010] Further, when the three-position switch is at the intermediate position, the first driven gear meshes with a start end of the first driving gear rotating counterclockwise, and the second driven gear meshes with a start end of the second driving gear rotating clockwise.

[0011] When the three-position switch is at the intermediate position, the first driven gear meshes with a start end of the first driving gear that rotates clockwise, and the second driven gear meshes with a start end of the second driving gear that rotates counterclockwise; and because the two driving gears are both incomplete gears, and the two driven gears respectively mesh with start ends of the geared parts in a rotation direction in which functions of the driving gears are achieved, to facilitate distinguishing and controlling a start position and a stop position of a contact point when the three-position switch switches between the three positions.

[0012] Further, when the first driving gear rotates counterclockwise from the intermediate position to the isolating position, the first driven gear meshes with an other end of the toothed part of the first driving gear.

[0013] When the first driving gear rotates clockwise from the intermediate position to the grounding position, the first transmission gear meshes with an other end of the first driving gear, to facilitate distinguishing between and controlling the start position and the a stop position of the a contact point when the three-position switch switches between the three positions.

[0014] Further, when the second driving gear rotates clockwise from the intermediate position to the grounding position, the second driven gear meshes with an other end of the toothed part of the second driving gear.

[0015] This facilitates distinguishing and controlling a start position and a stop position of a contact point when the three-position switch switches between the three positions.

[0016] Further, the first driven gear and the second driven gear are respectively connected to a main shaft of the three-position switch by using an input shaft. When the first driving gear drives the first driven gear to rotate clockwise, the main shaft of the three-position switch rotates clockwise, so that the three-position switch switches from the intermediate position to the isolating position. When the second driving gear drives the second driven gear to rotate counterclockwise, the main shaft of the three-position switch rotates counterclockwise, so that the three-position switch switches from the intermediate position to the grounding position.

[0017] This apparatus can achieve that one motor drives two input shafts simultaneously to achieve respective rotation within specific angle ranges, and further drive the main shaft of the switch to rotate, thereby achieving switch of the switch between the three positions.

[0018] Further, the first driving gear and the second driving gear are coaxially connected with an output end of the motor by using an output shaft. One end of the output shaft is connected to an output end of the motor, and an other end of the output shaft is separately disposed through an axial center of the first driving gear and the second driving gear.

[0019] Further, a manual operation apparatus is included, configured to manually switch between the three positions of the three-position switch, where the manual operation apparatus includes a first operation shaft connected to the output shaft and configured to drive the first driving gear and the second driving gear to rotate counterclockwise by using the output shaft, to switch the three-position switch from the intermediate position to the isolating position, and further includes a second operation shaft configured to drive, by using the output shaft, the first driving gear and the second driving gear to rotate clockwise, to cause the three-position switch to switch from the intermediate position to the grounding position.

[0020] Further, a full gear is disposed on the output shaft, and the first operation shaft drives the first driving gear and the second driving gear to rotate counterclockwise by meshing with the full gear.

[0021] Further, a limiting plate is included, where limiting holes configured to limit a motion range of the first operation shaft and a motion range of the second operation shaft are separately provided on the limiting plate; and a baffle is further included, where when a manual operation handle is inserted into the first operation shaft and the second operation shaft, the baffle is configured to be pressed to enable a pin shaft on the baffle to extend into a corresponding limiting hole.BRIEF DESCRIPTION OF THE DRAWINGS

[0022] FIG. 1 is a three-dimensional schematic structural diagram of an electric apparatus of a three-position switch operating mechanism according to the present invention; FIG. 2 is a schematic structural diagram of a gear set according to the present invention; FIG. 3 is a schematic structural diagram of a gear set when an operating mechanism is at an intermediate position according to the present invention; FIG. 4 is a schematic structural diagram of a gear set when an operating mechanism is at a first closing position according to the present invention; FIG. 5 is a schematic structural diagram of a gear set when an operating mechanism is at a second closing position according to the present invention; FIG. 6 is a schematic structural diagram illustrating an operating mechanism at an intermediate position with a handle being inserted through a manual operation according to the present invention; and FIG. 7 is a schematic structural diagram illustrating an operating mechanism at a first closing position without a handle being inserted through a manual operation according to the present invention.

[0023] In the drawings: 1. motor; 2. front cover plate; 31. first input shaft; 32. second input shaft; 41. first operation shaft; 42. second operation shaft; 51. first driven gear; 52. first driving gear; 53. second driven gear; 54. second driving gear; 55. third gear; 56. fourth gear; 6. limiting plate; 62. second arc-shaped hole; 63. first arc-shaped hole; 7. second operation shaft baffle; 71. first operation shaft baffle; 72. second pin shaft; 73. first pin shaft; and 8. return spring.DETAILED DESCRIPTION

[0024] To make objectives, technical solutions, and advantages of the present invention clearer, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0025] An embodiment of a rotary three-position switch operating mechanism is described below.

[0026] A rotary three-position switch operating mechanism of the present invention shown in FIG. 1 to FIG. 7, including: a bidirectional clutching motor 1, a front cover plate 2, a first input shaft 31, a second input shaft 32, a first operation shaft 41, a second operation shaft 42, a first driven gear 51, a first driving gear 52, a second driven gear 53, a second driving gear 54, a third gear 55, a fourth gear 56, and a limiting plate 6. The motor 1 and the limiting plate 6 are fixed on the front cover plate 2. As shown in FIG. 2, the first driven gear 51 and the second driven gear 53 are respectively fixed on the first input shaft 31 and the second input shaft 32, the first driving gear 52, the second driving gear 54, and the fourth gear 56 are simultaneously fixed on an output shaft of the motor, and the second operation shaft 42 is further disposed on the motor, to directly manually drive the output shaft of the motor to rotate. The third gear 55 is fixed on the first operation shaft 41. During working, the first driven gear 51 meshes with the first driving gear 52, the second driven gear 53 meshes with the second driving gear 54, and the third gear 55 meshes with the fourth gear 56. The first driving gear 52 and the second driving gear 54 are two incomplete gears, and other gears are all complete gears. Two baffles are respectively mounted on the first operation shaft 41 and the second operation shaft 42, and a pin shaft is correspondingly fixedly disposed on each of the baffles and separately matches a corresponding arc-shaped hole on the limiting plate 6, to achieve position limit locking on the first operation shaft 41 and the second operation shaft 42. Two return springs are respectively mounted on the first operation shaft 41 and the second operation shaft 42, and are located between the corresponding limiting plate and baffle; and the motor may drive the output shaft of the motor clockwise to rotate, or may drive the output shaft of the motor counterclockwise to rotate, but the output shaft of the motor cannot drive the motor to rotate.

[0027] Performing an electric operation from an intermediate position (an opening position) to a first closing position (grounding position): Positions of the first driven gear 51, the first driving gear 52, the second driven gear 53, and the second driving gear 54 of an electric apparatus of a rotary three-position switch operating mechanism in the present invention are shown in FIG. 3 when the three-position switch is at the intermediate position. The first driven gear 51 meshes with a start end of the first driving gear 52 rotating counterclockwise, and the second driven gear 53 meshes with a start end of the second driving gear 54 rotating clockwise; and because the first driving gear 52 and the second driving gear 54 are two incomplete gears, the start end of the first driving gear 52 is a start end of a toothed sector of the first driving gear 52 rotating counterclockwise, and the start end of the second driving gear 54 is a start end of a toothed sector of the second driving gear 54 rotating clockwise. In a process of grounding closing, the motor 1 rotates clockwise, and drives the output shaft of the motor and the first driving gear 52, the second driving gear 54, and the fourth gear 56 on the output shaft of the motor to rotate clockwise. The second driving gear 54 rotates clockwise by a specific angle to start to mesh with the second driven gear 53, and drives the second driven gear 53 to rotate counterclockwise, and drives a main shaft of the switch to rotate counterclockwise by a specific angle to reach a grounding closing position via the second input shaft 32, so that a contact point is switched, and the motor stops. In this case, positions of the first driven gear 51, the first driving gear 52, the second driven gear 53, and the second driving gear 54 of the electric apparatus are shown in FIG. 4. The second driven gear 53 meshes with an other end of the toothed part of the second driving gear 54. Although the first driven gear 51 and the first driving gear 52 are also a pair of meshed gears, it can be seen from FIG. 3 and FIG. 4 that the motor rotates clockwise, and because the first driving gear 52 is an incomplete gear, the first driven gear 51 is not driven to rotate in this case. Therefore, rotation of the first input shaft 31 is not affected, and an action at another closing position (an isolating position) of the switch is not affected.

[0028] Performing an electric operation from the first closing position to the intermediate position: Positions of the first driven gear 51, the first driving gear 52, the second driven gear 53, and the second driving gear 54 of an electric apparatus of a rotary three-position switch operating mechanism in the present invention are shown in FIG. 4 when the three-position switch is at the first closing position. In a process of opening at the first closing position, namely, the grounding position, the motor 1 rotates counterclockwise, driving the output shaft of the motor and the first driving gear 52, the second driving gear 54, and the fourth gear 56 on the output shaft of the motor to rotate counterclockwise. Because the second driving gear 54 and the second driven gear 53 are still in a meshed state at the first closing position, the second driving gear 54 directly drives the second driven gear 53 to rotate clockwise, to reach the opening position (namely, the intermediate position). The contact point is switched, the motor stops, and each gear returns to an initial position shown in FIG. 3. In this process, because a working position of the first driving gear 52 relative to the first driven gear 51 is always a non-toothed area, the first driven gear 51 is not driven to rotate.

[0029] Performing an electric operation from the intermediate position (the opening position) to the second closing position (the isolating position): Positions of the first driven gear 51, the first driving gear 52, the second driven gear 53, and the second driving gear 54 of an electric apparatus of a rotary three-position switch operating mechanism in the present invention are shown in FIG. 3 when the three-position switch is at the intermediate position. In a process of closing, the motor 1 rotates counterclockwise, and drives the output shaft of the motor and the first driving gear 52, the second driving gear 54, and the fourth gear 56 on the output shaft of the motor to rotate counterclockwise. The first driving gear 52 rotates counterclockwise by a specific angle to start to mesh with the first driven gear 51, and drives the first driven gear 51 to rotate clockwise, and drives the main shaft of the switch to rotate clockwise by a specific angle to reach the isolating closing position via the first input shaft 31, so that the contact point is switched, and the motor 1 stops. In this case, positions of the first driven gear 51, the first driving gear 52, the second driven gear 53, and the second driving gear 54 of the electric apparatus are shown in FIG. 5. The first driven gear 51 meshes with an other end of the toothed part of the first driving gear 52. Although the second driven gear 53 and the second driving gear 54 are also a pair of meshed gears, it can be seen from FIG. 3 and FIG. 5 that the motor 1 rotates counterclockwise, and because the second driving gear 54 is an incomplete gear, the second driven gear 53 is not driven to rotate in this case. Therefore, rotation of the second input shaft 32 is not affected, and an action at another closing position (a grounding position) of the switch is not affected.

[0030] Performing an electric operation from the second closing position to the intermediate position: Positions of the first driven gear 51, the first driving gear 52, the second driven gear 53, and the second driving gear 54 of an electric apparatus of a rotary three-position switch operating mechanism in the present invention are shown in FIG. 5 when the three-position switch is at the second closing position. In a process of opening, the motor 1 rotates clockwise, and drives the output shaft of the motor and the first driving gear 52, the second driving gear 54, and the fourth gear 56 on the output shaft of the motor to rotate clockwise. Because the first driving gear 52 and the first driven gear 51 are still at a meshed position when the rotary three-position switch operating mechanism is at the second closing position, the first driving gear 52 directly drives the first driven gear 51 to rotate, to reach the opening position (namely, an intermediate position). The contact point is switched, the motor stops, and each gear returns to the initial position shown in FIG. 3. In this process, because a working position of the second driving gear 54 relative to the second driven gear 53 is always a non-toothed area, the second driven gear 53 is not driven to rotate.

[0031] To ensure that the mechanism can switch between the electric operation and a manual operation at any position, the following describes in detail a process in which the manual operation is performed on the electric apparatus from the intermediate position to the first closing position / the second closing position and then the electric operation is performed from the first closing position / the second closing position to the intermediate position, and a process in which the electric operation is performed on the electric apparatus from the intermediate position to the first closing position / the second closing position and then the manual operation is performed from the first closing position / the second closing position to the intermediate position.

[0032] Performing the manual operation from the intermediate position (the opening position) to the first closing position (the grounding position), and performing the electric operation from the first closing position to the intermediate position: During the manual operation performed from the intermediate position to the first closing position, a handle is inserted into the second operation shaft 42, to push a second operation shaft baffle 7 to perform an axial movement on the second operation shaft 42, to reach a position shown in FIG. 6. As shown in FIG. 6, the second pin shaft 72 enters the second arc-shaped hole 62 in the limiting plate, and is locked with the second operation shaft 42. In this case, the second operation shaft 42 can only rotate clockwise to operate toward the first closing position, thereby avoiding a safety hazard caused by a user performing counterclockwise rotation to operate toward another closing position. Rotation of the second operation shaft 42 clockwise also drives the output shaft of the motor to rotate clockwise. A subsequent closing process is exactly the same as the foregoing process of the electric operation from the intermediate position to the first closing position. In this case, a process of the electric operation from the first closing position to the intermediate position is also exactly the same as the foregoing process, and details are not described again.

[0033] Performing the electric operation from the intermediate position (the opening position) to the first closing position (the grounding position), and performing the manual operation from the first closing position to the intermediate position: A process of the electric operation from the intermediate position to the first closing position is described in detail above. After the first closing position is reached, positions of the gears are shown in FIG. 4, and position of the second operation shaft baffle 7 is shown in FIG. 7. In this case, the manual operation is performed. The handle is inserted into the second operation shaft 42. When the handle is inserted, the handle pushes the second operation shaft baffle 7, so that the second pin shaft 72 enters the second arc-shaped hole 62 on the limiting plate. The second arc-shaped hole 62 locks the second operation shaft 42. In this case, the second operation shaft 42 can only rotate counterclockwise to operate toward the intermediate position. Driven by the handle, the second operating shaft 42 rotates counterclockwise, and then an opening process is exactly the same as a process of performing electric operation from the first closing position to an intermediate position. Details are not described again.

[0034] Performing the manual operation from the intermediate position (the opening position) to the second closing position (the isolating position), and performing the electric operation from the second closing position to the intermediate position: FIG. 1 shows a position of the first operation shaft baffle 71 when the handle is not inserted into the first operation shaft 41. When the manual operation is performed from the intermediate position to the second closing position, the handle is inserted into the first operation shaft 41, to push the first operation shaft baffle 71 to perform an axial movement on the first operation shaft 41, to reach a position similar to the position of the second operation shaft baffle 7 shown in FIG. 6. In this case, the first pin shaft 73 enters the first arc-shaped hole 63 on the limiting plate, to lock the first operation shaft 41. In this case, the first operation shaft 41 can only rotate clockwise to operate toward the second closing position, thereby avoiding a safety hazard caused by the user performing counterclockwise rotation to operate toward another closing position. The first operation shaft 41 rotates clockwise, driving the third gear 55 on the first operation shaft 41 to rotate clockwise, and simultaneously driving the fourth gear 56 meshing with the third gear 55 to rotate counterclockwise. The fourth gear 56 drives the output shaft of the motor to rotate counterclockwise. In this case, because the handle is not inserted into the second operation shaft 42, the second pin shaft 72 does not enter the second arc-shaped hole 62 on the limiting plate as shown in FIG. 6, and the second operation shaft 42 is not locked. In this case, the second operation shaft 42 can rotate counterclockwise. A subsequent closing process is the same as the foregoing process of the electric operation from the intermediate position to the second closing position. In this case, a process of the electric operation from the second closing position to the intermediate position is also the same as the foregoing process, and details are not described again.

[0035] Performing the electric operation from the intermediate position (the opening position) to the second closing position (the isolating position), and performing the manual operation from the second closing position to the intermediate position: A process of the electric operation from the intermediate position to the second closing position is described in detail above. When the second closing position is reached, positions of the gears are shown in FIG. 5. In this case, if the manual operation is performed, driven by the handle, the first operation shaft 41 rotates counterclockwise, driving the third gear 55 on the first operation shaft 41 to rotate counterclockwise, and simultaneously driving the fourth gear 56 meshing with the third gear 55 to rotate clockwise. The fourth gear 56 drives the motor output shaft to rotate clockwise. A subsequent opening process is the same as the process of the electric operation from the second closing position to the intermediate position, and details are not described again.

Examples

Embodiment Construction

[0024]To make objectives, technical solutions, and advantages of the present invention clearer, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0025]An embodiment of a rotary three-position switch operating mechanism is described below.

[0026]A rotary three-position switch operating mechanism of the present invention shown in FIG. 1 to FIG. 7, including: a bidirectional clutching motor 1, a front cover plate 2, a first input shaft 31, a second input shaft 32, a first operation shaft 41, a second operation shaft 42, a first driven gear 51, a first driving gear 52, a second driven gear 53, a second driving gear 54, a third gear 55, a fourth gear 56, and a limiting plate 6. The motor 1 and the limiting plate 6 are fixed on the front cover plate 2. As shown in FIG. 2, the first driven gear 51 and the second driven gear 53 are respectively fixed on the first input shaft 31 and the second input shaft 32, the first driv...

Claims

1. A rotary three-position switch operating mechanism, comprising: a gear set, configured for a three-position switch to switch between an intermediate position, an isolating position, and a grounding position, the gear set comprises a first driving gear and a second driving gear that are coaxially disposed, and further comprises a first driven gear only meshing with the first driving gear and configured to switch between the intermediate position and the isolating position, and a second driven gear only meshing with the second driving gear and configured to switch between the intermediate position and the grounding position; and when the first driving gear and the second driving gear rotate counterclockwise, the first driving gear meshes with the first driven gear to drive the three-position switch to switch from the intermediate position to the isolating position, and when the first driving gear and the second driving gear rotate clockwise, the second driving gear meshes with the second driven gear to drive the three-position switch to switch from the intermediate position to the grounding position.

2. The rotary three-position switch operating mechanism according to claim 1, wherein the first driving gear and the second driving gear are both of an incomplete gear structure, and a toothed part and a non-toothed part of the two driving gears are staggered.

3. The rotary three-position switch operating mechanism according to claim 1 or 2, wherein when the three-position switch is at the intermediate position, the first driven gear meshes with a start end of the first driving gear rotating counterclockwise, and the second driven gear meshes with a start end of the second driving gear rotating clockwise.

4. The rotary three-position switch operating mechanism according to claim 3, wherein when the first driving gear rotates counterclockwise from the intermediate position to the isolating position, the first driven gear meshes with an other end of the toothed part of the first driving gear.

5. The rotary three-position switch operating mechanism according to claim 3, wherein when the second driving gear rotates clockwise from the intermediate position to the grounding position, the second driven gear meshes with an other end of the toothed part of the second driving gear.

6. The rotary three-position switch operating mechanism according to any of claim 1, wherein the first driven gear and the second driven gear are respectively connected to a main shaft of the three-position switch by using an input shaft, and when the first driving gear drives the first driven gear to rotate clockwise, the main shaft of the three-position switch rotates clockwise, to cause the three-position switch to switch from the intermediate position to the isolating position; and when the second driving gear drives the second driven gear to rotate counterclockwise, the main shaft of the three-position switch rotates counterclockwise, to cause the three-position switch to switch from the intermediate position to the grounding position.

7. The rotary three-position switch operating mechanism according to claim 1, wherein the first driving gear and the second driving gear are coaxially connected with an output end of a motor by using an output shaft, an end of the output shaft is connected to the output end of the motor, and an other end of the output shaft is separately disposed through axial centers of the first driving gear and the second driving gear.

8. The rotary three-position switch operating mechanism according to claim 7, further comprising: a manual operation apparatus, configured to manually switch between the three positions of the three-position switch, the manual operation apparatus comprises a first operation shaft connected to the output shaft and configured to drive, by using the output shaft, the first driving gear and the second driving gear to rotate counterclockwise, to cause the three-position switch to switch from the intermediate position to the isolating position, and further comprises a second operation shaft configured to drive, by using the output shaft, the first driving gear and the second driving gear to rotate clockwise, to cause the three-position switch to switch from the intermediate position to the grounding position.

9. The rotary three-position switch operating mechanism according to claim 8, wherein a full gear is further disposed on the output shaft, and the first operation shaft drives the first driving gear and the second driving gear to rotate counterclockwise by meshing with the full gear.

10. The rotary three-position switch operating mechanism according to claim 8 or 9, further comprising: a limiting plate, wherein limiting holes configured to limit a motion range of the first operation shaft and a motion range of the second operation shaft are separately disposed on the limiting plate; and a baffle, wherein when a manual operation handle is inserted into the first operation shaft and the second operation shaft, the baffle is configured to be pressed to enable a pin shaft on the baffle to extend into a corresponding limiting hole.

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