Rotary three-position switch operating mechanism

Abstract

The present invention relates to a rotary three-position switch operating mechanism, and belongs to the technical field of ring main units. The present solution comprises a gear set used for mutually switching a three-position switch between three positions, the gear set comprising a first driving gear and a second driving gear which are coaxially arranged, and further comprising a first transmission gear which is only meshed with the first driving gear in order for a mutual switch from a middle position to an isolation position, and a second transmission gear which is only meshed with the second driving gear in order for a mutual switch from the middle position to a grounding position. When the two driving gears rotate counterclockwise, the first driving gear is meshed with the first transmission gear so as to drive the switch to switch from the middle position to the isolation position; when the two driving gears rotate clockwise, the second driving gear is meshed with the second transmission gear so as to drive the switch to switch from the middle position to the grounding position. The present solution is used for solving the problem of relatively complex switching processes in the prior art in which for a three-position switch to switch between three positions by means of gear transmission has to be implemented with the help of another auxiliary means.

Description

A rotary three-position switch operating mechanism Technical Field

[0001] The invention relates to a rotary three-position switch operating mechanism, belonging to the technical field of ring network cabinets. Background Art

[0002] The three-position switch operating mechanism is an important device for the three-position switch in the gas-insulated metal-enclosed switchgear to realize the three functions of opening, isolating and closing, and earthing and closing. Most of the existing three-position switch operating mechanisms of the ring main cabinet are equipped with electric devices and manual operation functions. However, when the electric device is used to realize the three states of opening, isolating and earthing, other devices are required. The intermediate implementation process and structural design are relatively complicated.

[0003] A Chinese invention patent application, published as CN102543551A, discloses an operating mechanism for a three-position switch. This scheme incorporates a display rotary lever device with a rotating groove machined into the side of a circular rotary lever shaft. When operating the isolating or grounding switch, as the motor drives the lead screw main shaft to rotate, two guide shafts mounted on the nut assembly perform linear motion back and forth. One end of the guide shaft slides linearly within the rotating groove of the display rotary lever device, which is converted into rotation of a display dial by the rotary lever shaft. Throughout the entire travel of the three-position switch between the grounding position and the isolation position, the lead screw main shaft's multiple revolutions are converted to 1 / 4 of the display dial's revolutions. Combined with the switch status symbols on the operating panel, the position of the three-position switch can be accurately displayed in real time. This scheme requires the use of other auxiliary features, such as the rotating groove, the display dial, and the switch status symbols, to achieve position switching throughout the entire travel between the grounding position and the isolation position, resulting in a relatively complex structure and conversion process.

[0004] Chinese invention patent application publication number CN112002570A discloses a three-position switch operating mechanism. This solution includes a motor module, a gear transmission module, a manual input module, and a limit module. The motor module drives the limit module via the gear transmission module; the manual input module drives the limit module via the gear transmission module; and the limit module moves and limits itself between the reference open position, the isolation closed position, and the earthing closed position. This solution requires the gear transmission module to drive the limit module to achieve position switching, resulting in a complex switching process and increased manufacturing costs.

[0005] Summary of the Invention

[0006] The purpose of the present invention is to provide a rotary three-position switch operating mechanism to solve the problem in the prior art that when a three-position switch realizes the three states of disconnection, isolation and grounding through gear transmission, it needs to use other auxiliary methods to realize the mutual conversion of the three functions, thereby making the conversion process of the three functions relatively complicated.

[0007] To achieve the above object, the solution of the present invention includes:

[0008] A rotary three-position switch operating mechanism includes a gear set for realizing mutual switching of the three-position switch between an intermediate position, an isolation position, and an engagement position. The gear set includes a first drive gear and a second drive gear arranged coaxially, and also includes a first transmission gear that is only engaged with the first drive gear and is used to switch between the intermediate position and the isolation position, and a second transmission gear that is only engaged with the second drive gear and is used to switch between the intermediate position and the engagement position; when the first drive gear and the second drive gear rotate counterclockwise, the first drive gear engages with the first transmission gear to drive the three-position switch to switch from the intermediate position to the isolation position; when the first drive gear and the second drive gear rotate clockwise, the second drive gear engages with the second transmission gear to drive the three-position switch to switch from the intermediate position to the engagement position.

[0009] The first drive gear and the second drive gear are coaxially arranged. The first drive gear engages with the first transmission gear and rotates clockwise to realize the conversion of the three-position switch from the intermediate position to the isolation position. The second drive gear engages with the second transmission gear and rotates clockwise to realize the conversion of the three-position switch from the intermediate position to the contact position. The intermediate process and structural design of the three-position switch directly realizing the switching of the three functions through gear transmission of the present invention are simple and reliable, and do not require the use of other auxiliary methods or means to realize the conversion of the three functions, thereby reducing manufacturing and processing costs and improving production efficiency.

[0010] Furthermore, the first driving gear and the second driving gear are both incomplete gear structures, and the toothed parts and the toothless parts of the two driving gears are staggered.

[0011] Both driving gears are incomplete gears, and the gear parts and the non-gear parts of the two driving gears are staggered. On the one hand, the incomplete gear structure is simple and easy to process. On the other hand, through the simple structural design of the staggered setting, it is achieved that when the two driving gears rotate at the same time, only one transmission gear can be driven to rotate, thereby ensuring the reliability of the three-position switching of the three-position switch.

[0012] Furthermore, when the three-position switch is in the middle position, the first transmission gear is engaged with the counterclockwise rotation starting end of the first drive gear, and the second transmission gear is engaged with the clockwise rotation starting end of the second drive gear.

[0013] When the three-position switch is in the middle position, the first transmission gear is engaged with the starting end of the clockwise rotation of the first drive gear, and the second transmission gear is engaged with the starting end of the counterclockwise rotation of the second drive gear; because the two drive gears are incomplete gears, the two transmission wheels are respectively engaged with the starting end of the gear part in the rotation direction realized by the drive gear function, which makes it convenient to distinguish and control the starting position and stop position of the contacts when the three positions of the three-position switch are switched.

[0014] Furthermore, when the first driving gear rotates counterclockwise from the middle position to the isolation position, the first transmission gear meshes with the other end of the first driving gear having the tooth portion.

[0015] When the first drive gear rotates clockwise from the middle position to the contact position, the first transmission gear meshes with the other end of the first drive gear, which facilitates the distinction and control of the start position and stop position of the contact when the three positions of the three-position switch are switched.

[0016] Furthermore, when the second driving gear rotates clockwise from the middle position to the engagement position, the second transmission gear meshes with the other end of the second driving gear having the tooth portion.

[0017] It is convenient to distinguish and control the start position and stop position of the contact when the three positions of the three-position switch are switched.

[0018] Furthermore, the first transmission gear and the second transmission gear are respectively connected to the three-position switch main shaft through the input shaft. When the first drive gear drives the first transmission gear to rotate clockwise, the three-position switch main shaft rotates clockwise to switch the three-position switch from the middle position to the isolation position; when the second drive gear drives the second transmission gear to rotate counterclockwise, the three-position switch main shaft rotates counterclockwise to switch the three-position switch from the middle position to the contact position.

[0019] The device can enable one motor to simultaneously drive two input shafts to rotate within their respective specific angle ranges, thereby driving the switch main shaft to rotate and switching the switch between three positions.

[0020] Furthermore, the first drive gear and the second drive gear are coaxially connected to the output end of the motor through an output shaft, one end of the output shaft is connected to the output end of the motor, and the other end is respectively arranged on the axis of the first drive gear and the second drive gear.

[0021] Furthermore, it also includes a manual operating device for manually switching the three positions of the three-position switch; the manual operating device includes a first operating shaft connected to the output shaft for driving the first drive gear and the second drive gear to rotate counterclockwise through the output shaft to switch the three-position switch from the intermediate position to the isolation position, and also includes a second operating shaft for driving the first drive gear and the second drive gear to rotate clockwise through the output shaft to switch the three-position switch from the intermediate position to the contact position.

[0022] Furthermore, a full gear is provided on the output shaft, and the first operating shaft drives the first drive gear and the second drive gear to rotate counterclockwise by meshing the full gear.

[0023] Furthermore, it also includes a limit plate, which is respectively provided with limit holes for limiting the movement range of the first operating shaft and the second operating shaft; it also includes a baffle, which is used to press the baffle into the corresponding limit hole when the manual operating handle is inserted into the first operating shaft and the second operating shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] FIG1 is a schematic perspective view of the electric device of the three-position switch operating mechanism of the present invention;

[0025] FIG2 is a schematic structural diagram of a gear set according to the present invention;

[0026] FIG3 is a schematic structural diagram of the gear set when the operating mechanism of the present invention is in the middle position;

[0027] FIG4 is a schematic structural diagram of the gear set when the operating mechanism of the present invention is in the first closing position;

[0028] FIG5 is a schematic structural diagram of the gear set when the operating mechanism of the present invention is in the second closing position;

[0029] FIG6 is a schematic structural diagram of the operating mechanism of the present invention when the handle is manually inserted and the operating mechanism is located in the middle position;

[0030] 7 is a schematic structural diagram of the operating mechanism of the present invention when it is in the first closing position and is manually operated without inserting the handle;

[0031] In the figure: 1. Motor; 2. Front cover; 31. First input shaft; 32. Second input shaft; 41. First operating shaft; 42. Second operating shaft; 51. First transmission gear; 52. First drive gear; 53. Second transmission gear; 54. Second drive gear; 55. Third gear; 56. Fourth gear; 6. Limiting plate; 62. Second arc-shaped hole; 63. First arc-shaped hole; 7. Second operating shaft baffle; 71. First operating shaft baffle; 72. Second pin; 73. First pin; 8. Return spring. DETAILED DESCRIPTION

[0032] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0033] An embodiment of a rotary three-position switch operating mechanism:

[0034] As shown in Figures 1 to 7 , a rotary three-position switch operating mechanism of the present invention includes: a two-way clutch motor 1, a front cover 2, a first input shaft 31, a second input shaft 32, a first operating shaft 41, a second operating shaft 42, a first transmission gear 51, a first drive gear 52, a second transmission gear 53, a second drive gear 54, a third gear 55, a fourth gear 56, and a limit plate 6. The motor 1 and the limit plate 6 are fixed to the front cover 2. As shown in Figure 2, the first transmission gear 51 and the second transmission gear 53 are respectively fixed to the first input shaft 31 and the second input shaft 32, and the first drive gear 52, the second drive gear 54, and the fourth gear 56 are simultaneously fixed to the motor output shaft. The motor is also provided with a second operating shaft 42, which can be directly manually driven to rotate the motor output shaft; the third gear 55 is fixed to the first operating shaft 41. During operation, the first transmission gear 51 and the first drive gear 52 are meshed, the second transmission gear 53 and the second drive gear 54 are meshed, and the third gear 55 and the fourth gear 56 are meshed. The first drive gear 52 and the second drive gear 54 are two incomplete gears, and the other gears are complete gears. Two baffles are respectively installed on the first operating shaft 41 and the second operating shaft 42, and each baffle is fixed with a pin shaft, which cooperates with the corresponding arc-shaped hole on the limit plate 6 to achieve the limit locking of the first operating shaft 41 and the second operating shaft 42. The two return springs are respectively installed on the first operating shaft 41 and the second operating shaft 42, and are located between the corresponding limit plates and baffles; the motor can drive the motor output shaft to rotate clockwise or counterclockwise, but the motor output shaft cannot drive the motor to rotate in the reverse direction.

[0035] Electric operation from the middle position (open position) to the first closed position (closed position): Figure 3 shows the positions of the first transmission gear 51, first drive gear 52, second transmission gear 53, and second drive gear 54 of the electric device of the rotary three-position switch operating mechanism of the present invention when the three-position switch is in the middle position. The first transmission gear 51 is engaged with the counterclockwise starting end of the first drive gear 52, and the second transmission gear 53 is engaged with the clockwise starting end of the second drive gear 54. Because the first drive gear 52 and the second drive gear 54 are two incomplete gears, the starting end of the first drive gear 52 is the counterclockwise starting end of the toothed portion of the first drive gear 52, and the starting end of the second drive gear 54 is the clockwise starting end of the toothed portion of the second drive gear 54. During the grounding closing process, motor 1 rotates clockwise, driving the motor output shaft and the first, second, and fourth gears 52, 54, and 56 thereof to rotate clockwise. The second drive gear 54 rotates clockwise a certain angle and begins to mesh with the second transmission gear 53, driving the second transmission gear 53 to rotate counterclockwise. This, in turn, drives the switch main shaft counterclockwise through the second input shaft 32 to rotate a certain angle to the grounding closing position, and the contact switching motor stops. At this point, the positions of the first transmission gear 51, 52, 53, and 54 of the electric device are shown in FIG4 , with the second transmission gear 53 meshing with the other end of the toothed portion of the second drive gear 54. Although the first transmission gear 51 and the first drive gear 52 are also a pair of meshing gears, as can be seen from FIG3 and FIG4 , the clockwise rotation of the motor does not drive the first transmission gear 51, as the first drive gear 52 is an incomplete gear. Therefore, it does not affect the rotation of the first input shaft 31, and thus does not affect the operation of the switch in the other closing position (isolating position).

[0036] Electric operation from the first closing position to the middle position: Figure 4 shows the positions of the first transmission gear 51, first drive gear 52, second transmission gear 53, and second drive gear 54 of the electric device of a rotary three-position switch operating mechanism of the present invention when the three-position switch is in the first closing position. During the opening process of the first closing position, i.e., the contact position, the motor 1 rotates counterclockwise, driving the motor output shaft and the first drive gear 52, second drive gear 54, and fourth gear 56 thereon to rotate counterclockwise. Since the second drive gear 54 and the second transmission gear 53 are still in meshing state in the first closing position, the second drive gear 54 directly drives the second transmission gear 53 to rotate clockwise at this time, reaching the opening position (i.e., the middle position), the contacts are switched, the motor stops, and the gears return to the initial positions shown in Figure 3. During this process, since the working position of the first drive gear 52 relative to the first transmission gear 51 is always in the toothless area, it will not drive the first transmission gear 51 to rotate.

[0037] Electric operation from the middle position (opening position) to the second closing position (isolating position): Figure 3 shows the positions of the first transmission gear 51, first drive gear 52, second transmission gear 53, and second drive gear 54 of the electric device of the rotary three-position switch operating mechanism of the present invention when the three-position switch is in the middle position. During the closing process, the motor 1 rotates counterclockwise, driving the motor output shaft and the first drive gear 52, second drive gear 54, and fourth gear 56 thereon to rotate counterclockwise. The first drive gear 52 rotates counterclockwise by a certain angle and begins to mesh with the first transmission gear 51, driving the first transmission gear 51 to rotate clockwise. Then, through the first input shaft 31, the switch main shaft rotates clockwise by a certain angle to reach the isolation closing position, and the contact switching motor stops. At this time, the positions of the first transmission gear 51, first drive gear 52, second transmission gear 53, and second drive gear 54 of the electric device are as shown in Figure 5, and the first transmission gear 51 meshes with the other end of the toothed portion of the first drive gear 52. Although the second transmission gear 53 and the second drive gear 54 are also a pair of meshing gears, it can be seen from Figures 3 and 5 that when the motor 1 rotates counterclockwise, since the second drive gear 54 is an incomplete gear, it does not drive the second transmission gear 53 to rotate. Therefore, it does not affect the rotation of the second input shaft 32, and thus does not affect the action of the switch in the other closing position (the engaged position).

[0038] Electric operation from the second closing position to the middle position: Figure 5 shows the positions of the first transmission gear 51, first drive gear 52, second transmission gear 53, and second drive gear 54 of the electric device of a rotary three-position switch operating mechanism of the present invention when the three-position switch is in the second closing position. During the opening process, the motor 1 rotates clockwise, driving the motor output shaft and the first drive gear 52, second drive gear 54, and fourth gear 56 thereon to rotate clockwise. Since the first drive gear 52 and the first transmission gear 51 are still in the meshing position in the second closing position, the first drive gear 52 directly drives the first transmission gear 51 to rotate. When the three-position switch reaches the opening position (i.e., the middle position), the contacts are switched, the motor stops, and the gears return to the initial positions shown in Figure 3. During this process, since the working position of the second drive gear 54 relative to the second transmission gear 53 is always in the toothless area, it will not drive the second transmission gear 53 to rotate.

[0039] In order to ensure that the mechanism can be switched between electric operation and manual operation at any position, the following describes in detail the process of manually operating the electric device from the middle position to the first closing position / second closing position, and then electrically operating from the first closing position / second closing position to the middle position; and the process of electrically operating from the middle position to the first closing position / second closing position, and then manually operating from the first closing position / second closing position to the middle position.

[0040] Manually operate from the middle position (open position) to the first closing position (connection position), and then electrically operate from the first closing position to the middle position: When manually operating from the middle position to the first closing position, insert the handle into the second operating shaft 42, and push the second operating shaft baffle 7 to make axial movement on the second operating shaft 42 to reach the position shown in Figure 6. As shown in Figure 6, at this time, the second pin shaft 72 enters the second arc-shaped hole 62 on the limit plate, forming a lock on the second operating shaft 42. At this time, the second operating shaft 42 can only rotate clockwise to operate to the first closing position, preventing the user from rotating counterclockwise to operate to another closing position, causing a safety accident. The second operating shaft 42 rotates clockwise, which also drives the motor output shaft to rotate clockwise. The subsequent closing process is exactly the same as the above process of electrically operating from the middle position to the first closing position. At this time, the process of electrically operating from the first closing position to the middle position is also exactly the same as above, and will not be repeated.

[0041] From the middle position (opening position) electrically operated to the first closing position (connection position), and then manually operated from the first closing position to the middle position: the process of electrically operating from the middle position to the first closing position has been described in detail above. After reaching the first closing position, the positions of the gears are as shown in Figure 4, and the position of the second operating shaft baffle 7 is as shown in Figure 7. At this time, it is switched to manual operation, and the handle is inserted into the second operating shaft 42. When the handle is inserted, the handle pushes the second operating shaft baffle 7, so that the second pin shaft 72 enters the second arc-shaped hole 62 on the limit plate. The second arc-shaped hole 62 locks the second operating shaft 42. At this time, the second operating shaft 42 can only rotate counterclockwise and operate to the middle position. Driven by the handle, the second operating shaft 42 rotates counterclockwise. The subsequent opening process is exactly the same as the process of electrically operating from the first closing position to the middle position, and will not be repeated.

[0042] Manual operation from the middle position (opening position) to the second closing position (isolating position), and then electrically operated from the second closing position to the middle position: Figure 1 shows the position of the first operating shaft baffle 71 when the handle is not inserted on the first operating shaft 41. When manually operating from the middle position to the second closing position, the handle is inserted into the first operating shaft 41, pushing the first operating shaft baffle 71 to make axial movement on the first operating shaft 41 to reach a position similar to that of the second operating shaft baffle 7 shown in Figure 6. At this time, the first pin 73 enters the first arc-shaped hole 63 on the limit plate, locking the first operating shaft 41. At this time, the first operating shaft 41 can only rotate clockwise to operate to the second closing position, preventing the user from rotating counterclockwise to operate to another closing position, which may cause a safety accident. The first operating shaft 41 rotates clockwise, driving the third gear 55 on the first operating shaft 41 to rotate clockwise. Simultaneously, it drives the fourth gear 56, which is meshed with the third gear 55, to rotate counterclockwise. The fourth gear 56 then drives the motor output shaft to rotate counterclockwise. Since the handle is not inserted into the second operating shaft 42 at this point, the second pin 72 does not enter the second arc-shaped hole 62 of the limit plate as shown in FIG6 . The second operating shaft 42 is not locked, allowing it to rotate counterclockwise. The subsequent closing process is identical to the process described above for electrically operating from the intermediate position to the second closed position. The process for electrically operating from the second closed position to the intermediate position is also identical and will not be further described.

[0043] Electric operation from the middle position (opening position) to the second closing position (isolating position), and then manual operation from the second closing position to the middle position: The process of electric operation from the middle position to the second closing position has been introduced in detail above. When it reaches the second closing position, the positions of each gear are shown in Figure 5. At this time, if it is switched to manual operation, the first operating shaft 41 rotates counterclockwise under the drive of the handle, driving the third gear 55 on the first operating shaft 41 to rotate counterclockwise, and at the same time driving the fourth gear 56 engaged with the third gear 55 to rotate clockwise, and the fourth gear 56 drives the motor output shaft to rotate clockwise. The subsequent opening process is exactly the same as the process of electric operation from the second closing position to the middle position, and will not be repeated.

Claims

1. A rotary three-position switch operating mechanism, characterized in that: It includes a gear set for realizing mutual switching of a three-position switch between an intermediate position, an isolation position and a connection position, the gear set includes a first drive gear and a second drive gear arranged coaxially, and also includes a first transmission gear only meshed with the first drive gear for mutual switching from the intermediate position to the isolation position, and a second transmission gear only meshed with the second drive gear for mutual switching from the intermediate position to the connection position; when the first drive gear and the second drive gear rotate counterclockwise, the first drive gear meshes with the first transmission gear to drive the three-position switch to switch from the intermediate position to the isolation position, and when the first drive gear and the second drive gear rotate clockwise, the second drive gear meshes with the second transmission gear to drive the three-position switch to switch from the intermediate position to the connection position.

2. The rotary three-position switch operating mechanism according to claim 1, characterized in that: The first driving gear and the second driving gear are both incomplete gear structures, and the toothed parts and the toothless parts of the two driving gears are staggered.

3. The rotary three-position switch operating mechanism according to claim 1 or 2, characterized in that: When the three-position switch is in the middle position, the first transmission gear is meshed with the counterclockwise rotation start end of the first drive gear, and the second transmission gear is meshed with the clockwise rotation start end of the second drive gear.

4. The rotary three-position switch operating mechanism according to claim 3, characterized in that: When the first driving gear rotates counterclockwise from the middle position to the isolation position, the first transmission gear meshes with the other end of the first driving gear having the toothed portion.

5. The rotary three-position switch operating mechanism according to claim 3, characterized in that: When the second driving gear rotates clockwise from the middle position to the engagement position, the second transmission gear meshes with the other end of the second driving gear having the toothed portion.

6. The rotary three-position switch operating mechanism according to any one of claims 1, characterized in that: The first transmission gear and the second transmission gear are respectively connected to the three-position switch main shaft through the input shaft. When the first driving gear drives the first transmission gear to rotate clockwise, the three-position switch main shaft rotates clockwise to switch the three-position switch from the middle position to the isolation position. When the second driving gear drives the second transmission gear to rotate counterclockwise, the three-position switch main shaft rotates counterclockwise to switch the three-position switch from the middle position to the contact position.

7. The rotary three-position switch operating mechanism according to claim 1, characterized in that: The first drive gear and the second drive gear are coaxially connected to the output end of the motor through an output shaft, one end of the output shaft is connected to the output end of the motor, and the other end is respectively passed through the axis of the first drive gear and the second drive gear.

8. The rotary three-position switch operating mechanism according to claim 7, characterized in that: It also includes a manual operating device for manually switching the three positions of the three-position switch; the manual operating device includes a first operating shaft connected to the output shaft and used to drive the first drive gear and the second drive gear to rotate counterclockwise through the output shaft to switch the three-position switch from the middle position to the isolation position, and also includes a second operating shaft for driving the first drive gear and the second drive gear to rotate clockwise through the output shaft to switch the three-position switch from the middle position to the contacting position.

9. The rotary three-position switch operating mechanism according to claim 8, characterized in that: The output shaft is also provided with a full gear, and the first operating shaft drives the first driving gear and the second driving gear to rotate counterclockwise by meshing the full gear.

10. The rotary three-position switch operating mechanism according to claim 8 or 9, characterized in that: It also includes a limit plate, which is respectively provided with limit holes for limiting the movement range of the first operating shaft and the second operating shaft; it also includes a baffle, which is used to press the baffle in so that the pin shaft on the baffle extends into the corresponding limit hole when the manual operating handle is inserted into the first operating shaft and the second operating shaft.

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