Three-position switch operating mechanism for gas-insulated switchgear switch cabinet

Abstract

The invention discloses a three-position switch operating mechanism for a switch cabinet of a gas insulated switchgear, which is characterized by comprising a mechanism main shaft driven by the operating mechanism to rotate; the driving mechanism is connected with a screw rod of the three-position switch through chain transmission, so that the driving output of the operating mechanism to the three-position switch is realized, and the driving mechanism is also connected with a speed reduction transmission structure for transmitting position signals; a gear speed reduction system of the speed reduction transmission structure is connected with the mechanism main shaft; the output end of a gear speed reduction system of the speed reduction transmission structure is connected with the input end of the intermittent gear structure; the output end of the intermittent gear structure is connected with a signal output shaft; the signal output shaft is provided with a position indicating dial, and the position indicating dial is provided with mechanical indicating positions of a switching-on position, a switching-off position and a grounding position. A trigger disc is arranged on the signal output shaft; the trigger disc is provided with an actuator for triggering the lateral microswitch; and a manual operation sliding plate is arranged at the front part of the three-position switch operation mechanism.

Description

Technical Field

[0001] This invention relates to the field of high-voltage electrical switchgear technology, and specifically to a three-position switch operating mechanism for gas-insulated switchgear. Background Technology

[0002] Direct-acting three-position switches are widely used in gas-insulated switchgear due to their high current-carrying capacity and relatively uniform electric field distribution. The opening, closing, and grounding functions of a direct-acting three-position switch are achieved by rotating an internal insulated lead screw, which drives the moving contact to move linearly between the closed, open, and grounding positions. The output shaft of the operating mechanism is connected to the lead screw; the rotation of the output shaft drives the lead screw, which in turn moves the moving contact. Because the three-position switch is enclosed in a gas chamber and is under high voltage, the position signal of the moving contact cannot be directly obtained for its movement control. Therefore, while the operating mechanism outputs movement from the main shaft, it needs to detect the number of rotations and the angle of the main shaft to determine and control the position of the moving contact. Therefore, the operating mechanism must be equipped with a mechanical transmission structure that is linked to the main shaft, has a large transmission ratio, and can convert the multi-turn motion of the moving contact of the three-position switch from the closed position to the ground position into a single-turn motion or a linear single motion. This structure is used to drive and trigger the micro switch or changeover switch. The goal is to ensure that the micro switch or changeover switch receives a position signal and issues a stop command only when the moving contact is in position, rather than repeatedly receiving a position signal and issuing a stop command during the movement of the moving contact. When the operating mechanism motor drives the main shaft to rotate and moves the moving contact of the three-position switch to a predetermined position (closed position, open position, ground position), the micro switch (or changeover switch) is triggered by the actuator to issue a stop command to the drive motor of the mechanism, thus ending the movement of the moving contact.

[0003] Currently, direct-acting three-position switch operating mechanisms typically employ worm gears, multi-stage gears, or lead screws and nuts to reduce the multi-turn motion of the operating shaft of the direct-acting three-position switch to a single-turn or linear motion, driving the actuator to trigger the micro switch. In gas-insulated switchgear, the precise stopping of the moving contact of the three-position switch in each working area affects key performance indicators such as the insulation of the isolation break, the temperature rise of the three-position switch, and its short-time withstand capability under short-circuit current. The stroke accuracy of the actuator in the operating mechanism determines the accuracy of the moving contact stroke of the three-position switch. The actuator's stroke can accumulate due to factors such as transmission chain backlash, machining deviations of moving parts, assembly deviations of various parts, and micro switch actuation deviations. This actuator stroke deviation causes a discrepancy between the stroke of the three-position switch's moving contact and the theoretical value; the ratio of the magnitude of these two deviations is equal to the transmission ratio between them. Depending on the transmission ratio of various operating mechanisms, the movement deviation of the moving contact will vary in three different ways: 1. If the designed stroke of the trigger disc actuator is greater than the moving contact stroke of the three-position switch, the cumulative deviation of the moving contact stroke will be reduced according to the transmission ratio; 2. If the designed stroke of the trigger disc actuator is equal to the stroke of the three-position moving contact, the cumulative deviation of the moving contact stroke will be equal; 3. If the designed stroke of the trigger disc actuator is less than the stroke of the three-position moving contact, the cumulative deviation of the moving contact stroke will be amplified proportionally to the stroke.

[0004] In medium-voltage gas-insulated switchgear, the travel of the moving contact of a direct-acting three-position switch typically ranges from 200mm to 400mm depending on the voltage level. Based on the relationship between the design travel of the trigger panel actuator in the current three-position switch operating mechanism and the travel of the moving contact, two technical solutions can be identified, each with the following problems: 1) One type involves a travel ratio greater than or close to 1 between the microswitch trigger plate actuator and the moving contact of the three-position switch in the operating mechanism. This effectively reduces the movement deviation of the moving contact of the three-position switch caused by the movement deviation of the trigger plate actuator in the operating mechanism, and makes switch debugging more convenient. However, the large travel of the trigger plate actuator results in a larger overall size of the mechanism, higher cost, and limits the increase in the number of electrical signal inputs and outputs, making it unsuitable for the development of smart grid construction.

[0005] 2) Another type involves a microswitch actuator in the operating mechanism where the stroke ratio between the microswitch trigger actuator and the moving contact of the three-position switch is much less than 1. Therefore, the stroke of the microswitch trigger actuator can be made smaller, allowing for a reduction in the overall size of the mechanism and freeing up more space to accommodate more electrical signal inputs and outputs. However, because the small stroke of the microswitch trigger actuator corresponds to the large stroke of the moving contact, the movement deviation of the microswitch trigger actuator is amplified to the position deviation of the moving contact during the stroke of the three-position switch. Furthermore, due to the objective existence of deviations such as transmission chain backlash and the discreteness of the microswitch's stroke, there will be significant differences in the stopping position of the moving contact for each identical movement, making precise adjustment of the switch position quite difficult.

[0006] Therefore, in order to adapt to the trend of intelligent and miniaturized development of switchgear, there is a need for an operating mechanism of a direct-acting three-position switch that has a smaller overall size and can ensure that the motion ratio between the actuator and the moving contact of the three-position switch in the operating mechanism is greater than 1, thereby achieving better control accuracy. Summary of the Invention

[0007] In order to overcome the above-mentioned defects of the prior art, the purpose of this invention is to provide a direct-acting three-position switch operating mechanism that uses a combination of reduction gear transmission and intermittent gear transmission to control the action of a micro switch.

[0008] To achieve the objectives of this invention, the technical solution adopted is as follows: A three-position switch operating mechanism for a gas-insulated switchgear cabinet includes: A main shaft of a mechanism, which is driven to rotate by an operating mechanism; The operating mechanism drives the three-position switch via a chain drive and a lead screw, and is also connected to a speed reduction transmission structure for transmitting position signals. The gear reduction system of the speed reduction transmission structure is connected to the main shaft of the mechanism; The output end of the gear reduction system of the speed reduction transmission structure is connected to the input end of the intermittent gear structure. The output end of the intermittent gear structure is connected to a signal output shaft; A position indicator disk is provided on the signal output shaft, and the position indicator disk is provided with mechanical indicator positions for three positions: closed, open, and grounded. A trigger disk is provided on the signal output shaft, and the trigger disk is provided with an actuator that triggers a lateral micro switch; A manual operation slide is provided at the front of the three-position switch operating mechanism. The manual operation slide is provided with a grounding operation hole and an isolation operation hole. The manual operation slide can enable / disable manual grounding operation and enable / disable manual switching operation by moving.

[0009] In a preferred embodiment of the present invention, the operating mechanism is driven to rotate by a motor or by an operating handle inserted into one end of the main shaft of the mechanism.

[0010] In a preferred embodiment of the present invention, the motor drives the main shaft of the mechanism to move via chain drive.

[0011] In a preferred embodiment of the present invention, the output end of the gear reduction system is meshed with the input end of the intermittent gear structure.

[0012] In a preferred embodiment of the present invention, the gear reduction system is a three-stage reduction gear set, and the reduction ratios of the three-stage reduction gear sets are different.

[0013] In a preferred embodiment of the present invention, the micro switch is a micro switch group arranged laterally around the trigger disk, and the trigger arm of the micro switch group cooperates with the outer edge contour of the actuator on the trigger disk.

[0014] In a preferred embodiment of the present invention, the positioning and support of shaft-like parts in each transmission component of the three-position switch operating mechanism are achieved by installing partitions.

[0015] In a preferred embodiment of the present invention, the intermittent gear structure comprises a driving intermittent gear and a driven intermittent gear meshing with each other; The active intermittent gear has teeth in a sector-shaped area on its circumference, and the rest is a smooth arc surface with a diameter smaller than the root circle. The driven intermittent gear is a full-tooth gear, and the number of teeth on the driven intermittent gear is greater than the number of teeth on the toothed part of the driving intermittent gear.

[0016] The beneficial effects of this invention are as follows: 1) Small size and compact structure: Intermittent gear transmission achieves a large reduction ratio between the main shaft of the operating mechanism and the signal output shaft in the three-position full-range motion under the condition of small pitch circle diameter. This allows the signal output shaft to rotate within an angle range of one revolution. Compared with conventional large-ratio reduction transmissions such as gear transmission and worm gear transmission, the diameter is reduced and the volume of the transmission pair is reduced, making the mechanism layout more compact.

[0017] 2) Precise three-position control: The intermittent gear transmission structure integrates the large reduction ratio of the main shaft of the operating mechanism to the signal output shaft during the entire three-position movement and the small reduction ratio when the contact moves to the position. By using the small reduction ratio when the contact moves to the position, the signal output shaft can correspond to the unit movement distance of the three-position switch with a larger rotation angle. This enables precise control of the micro switch triggering with a smaller outer diameter of the trigger disc actuator, which means precise control of the moving contact position of the three-position switch and precise output of the position signal.

[0018] 3) Simple layout and low cost: The gear transmission automatically realizes that the required input, output, and mechanical indication of the operating mechanism are in the same dimension, eliminating the additional mechanical transmission structure required by worm gear or lead screw reduction transmissions to achieve the same input, output, and mechanical indication in the same dimension when the direction of motion changes. This simplifies the overall structural layout of the operating mechanism and reduces the manufacturing cost.

[0019] 4) High reliability: The use of spur gear transmission parts avoids the self-locking wear of worm gears and the complex machining of cam mechanisms. The structure is simple, easy to process, has a long service life, and a low failure rate. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall arrangement of the three-position switch operating mechanism of the present invention. Figure 1 .

[0021] Figure 2 This is a schematic diagram of the overall arrangement of the three-position switch operating mechanism of the present invention. Figure 2 .

[0022] Figure 3 This invention relates to a mechanism for outputting and transmitting the spindle position signal. Figure 1 .

[0023] Figure 4 This invention relates to a mechanism for outputting and transmitting the spindle position signal. Figure 2 .

[0024] Figure 5 This is a schematic diagram of the intermittent gear structure of the present invention in the meshing state.

[0025] Figure 6 This is a schematic diagram of the intermittent gear structure of the present invention in the idling state.

[0026] Figure 7 This is a schematic diagram showing the interaction between the signal output shaft, position indicator, trigger disk, and micro switch assembly of the present invention. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of the invention. Furthermore, in the following descriptions, well-known structures and technologies are omitted to avoid unnecessarily obscuring the concept of the invention.

[0028] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention. Furthermore, terms such as "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] like Figure 1 As shown in Figure 2, a three-position switch operating mechanism for a gas-insulated switchgear includes a main shaft 1. The main shaft 1 is driven to rotate by an operating mechanism, which is driven by a motor 9 or by an operating handle inserted into one end of the main shaft 1. The motor 9 drives the main shaft 1 via chain transmission.

[0030] The operating mechanism drives the three-position switch via a chain drive and a lead screw, and is also connected to a speed reduction transmission structure for transmitting position signals.

[0031] Specifically, such as Figure 3 and Figure 4 The spindle position signal output transmission structure shown in the figure, when the main spindle 1 of the mechanism is driven to rotate by the motor 9 or by manual operation, the main spindle 1 of the mechanism drives the gear 21 and gear 22 of the gear reduction system 2 of the reduction transmission structure to mesh for the first stage of reduction (the reduction ratio in the embodiment is 28:71).

[0032] Gear 22 of gear reduction system 2 drives coaxial gear 23 and gear 24 to mesh for the second stage of reduction (reduction ratio 28:71 in the embodiment).

[0033] Gear 24 of gear reduction system 2 drives coaxial gear 25 and gear 26 to mesh for third-stage reduction (reduction ratio 35:63 in the embodiment).

[0034] The gear 26 of the gear reduction system 2 rotates coaxially with the driving intermittent gear 31 of the intermittent gear structure 3.

[0035] The gear reduction system 2 of the speed reduction transmission structure is connected to the main shaft 1 of the mechanism, and the output end of the gear reduction system 2 of the speed reduction transmission structure is meshed with the input end of the intermittent gear structure 3.

[0036] The output end of the intermittent gear structure 3 is connected to the signal output shaft 4.

[0037] The intermittent gear structure 3 consists of a driving intermittent gear 31 and a driven intermittent gear 32 that mesh with each other. The circumference of the active intermittent gear 31 has a fan-shaped area with teeth, and the rest is a smooth arc surface with a diameter smaller than the root circle; The driven intermittent gear 32 is a full-tooth gear, and the number of teeth in the driven intermittent gear 32 is greater than the number of teeth in the toothed part of the driving intermittent gear 31.

[0038] Key points combined Figure 5 , 6 In this embodiment, the pitch circle diameter and module of the driving intermittent gear 31 and the driven intermittent gear 32 are equal. In this embodiment, the driving intermittent gear 31 has 15 teeth 311 machined in a sector area of ​​85.7°, and the remaining 274.3° is a smooth arc surface 312 with a diameter smaller than the tooth root circle diameter.

[0039] In this embodiment, the driven intermittent gear 32 is a full-tooth gear with 63 teeth. When the driving intermittent gear 31 rotates once, the driven intermittent gear 32 rotates 85.7°. The reduction ratio of the driving intermittent gear 31 for a whole revolution is 15:63, while the reduction ratio is 1:1 when the driving intermittent gear 31 and the driven intermittent gear 32 are meshed.

[0040] A position indicator disk 5 is provided on the signal output shaft 4, and the position indicator disk 5 is provided with mechanical indicator positions for three positions: closed, open, and grounded.

[0041] A trigger disk 7 is provided on the signal output shaft 4, and the trigger disk 7 is provided with an actuator that triggers the lateral micro switch 7.

[0042] The micro switch 7 is a micro switch group arranged laterally around the trigger disk, and the trigger arm of the micro switch group is matched with the outer edge contour of the actuator on the trigger disk 7.

[0043] A manual operation slide plate 10 is provided at the front of the three-position switch operating mechanism. The manual operation slide plate 10 is provided with a grounding operation hole and an isolation operation hole. The manual operation slide plate 10 can enable / disable manual opening and closing grounding operations and enable / disable manual opening and closing operations by moving.

[0044] The positioning and support of shaft-type parts in the transmission components of the three-position switch operating mechanism are achieved by installing partition 8.

[0045] Key points combined Figure 7 In this embodiment, several trigger disks 6 are fixedly installed on the signal output shaft 4.

[0046] The trigger plate 6 has four actuators 61, 62, 63, and 64 within a stroke of 311.5° for pressing the micro switch, which correspond to the four positions of "close", "open", "close to ground", and "open to ground" respectively.

[0047] Four sets of microswitches 7 are arranged on the side of the trigger plate 6. When the trigger plate 6 rotates with the spindle to different positions, the actuator on it will press down or release the trigger arm of the corresponding microswitch 7, thereby sending a clear and accurate position signal to the control system.

[0048] When the three-position switch is operated electrically, the motor control circuit is turned on and begins to move. The chain drive on the motor output shaft drives the main shaft of the mechanism to rotate. The main shaft of the mechanism drives the lead screw of the three-position switch to rotate through the chain drive, thereby achieving linear drive of the moving contact. At the same time, the main shaft 1 of the mechanism drives the intermittent gear pair to rotate through the gear reduction system 2. The driven gear rotates only when the toothed sector area of ​​the driving intermittent gear 31 and the driven intermittent gear 32 are engaged. When the toothed sector area of ​​the driving intermittent gear 31 disengages from the driven intermittent gear 32, the driven gear remains stationary until the toothed sector area of ​​the driving intermittent gear 31 rotates back and re-engages with the driven intermittent gear 32. Then the driven intermittent gear 32 starts to rotate again, driving the trigger disk on the signal output shaft to rotate.

[0049] The actuator on the trigger plate is used to trigger a microswitch to send a signal to stop the motor and provide electrical position indication. This intermittent "work-idle-work" characteristic is equivalent to greatly increasing the overall reduction ratio of the system.

[0050] By accurately designing the angle of the toothed section and the gear ratio of the two gears, the total stroke of the signal output shaft can be limited to an angle range of less than 360° (e.g., 30° to 330°). The trigger disc fixed on the output shaft rotates accurately within this limited angle. The specific contour of the actuator on the trigger disc (such as a boss or groove) can trigger the arranged micro-switch group within this range. When the intermittent gear pair is fitting the working area, the reduction ratio between the main shaft of the mechanism and the signal output shaft decreases because it does not contain the reduction ratio generated by intermittent motion. The corresponding rotation angle of the trigger disc is increased by a factor of two per unit angle of rotation of the main shaft of the mechanism, thereby achieving precise position control of the three-position switch and output of the position signal.

[0051] If the three-position switch is operated manually, the operating handle is inserted into the main shaft of the drive mechanism to rotate. Through the same deceleration transmission process as described above, the position signal of the three-position switch is accurately output.

[0052] By combining two sets of reduction gears with one set of intermittent gears, a combined reduction transmission with a large reduction ratio throughout the entire stroke and a small reduction ratio in certain areas is achieved. In the intermittent gear set, the pitch circle diameters of the driving intermittent gear 31 and the driven intermittent gear 32 are the same (of course, they can be adjusted according to the specific structural arrangement, but the pitch circle diameters of the two are basically the same). The driving intermittent gear 31 has teeth in part of its entire revolution, and the rest is a smooth outer circle with a diameter smaller than the root circle. The outer circle angle of the toothed part can generally be set between 30° and 330°. By using an angle for the toothed part, different reduction ratios can be achieved for the entire revolution. For example, if the toothed angle of the outer circle of the driving intermittent gear 31 is 60°, then the reduction ratio of the entire revolution of this intermittent gear transmission is 6:1. When the toothed part of the driving intermittent gear 31 meshes with the driven intermittent gear 32, the real-time reduction ratio of the intermittent gear transmission is 1:1.

[0053] In specific embodiments: When the three-position switch is in a certain position (open, closed, or grounded), it begins to perform a certain action (opening / closing the circuit breaker or opening / closing the ground). The input power of the main shaft 1 is reduced by the first, second, and third stages of reduction, driving the active intermittent gear 31 to rotate. At this time, the intermittent gear structure 3 is in the position shown in the figure. Figure 5 As shown, in the meshing state, the driving intermittent gear 31 drives the driven intermittent gear 32 to rotate in its toothed region 311. After the two have meshed and rotated 43°, the driven intermittent gear 32 disengages from the driving intermittent gear 31, and the driving intermittent gear 31 idles. Figure 6 The driven intermittent gear 32 remains stationary at the angular position before disengagement because the master and driven intermittent gears are respectively equipped with a limiting arc plate 35 and a limiting arc groove 36.

[0054] After the driving intermittent gear 31 idles for 274.3°, its toothed area re-engages with the driven intermittent gear 32, restarting the drive intermittent gear 32 to rotate 42.7° to complete a full revolution. Thereafter, the driving and driven intermittent gears 32 continue the above engagement-disengagement-engagement process to complete the second revolution of the driving intermittent gear 31. At this point, the driven intermittent gear 32 has rotated a total of 171.4°, driving the signal output shaft to rotate 171.4°. This triggers the microswitch by the actuator on the trigger plate, completing the operation. The 43°, 42.7°, and 171.4° angles described above are only theoretical examples. The position of the actuator on the trigger plate can be adjusted according to the actual stroke requirements of the three-position switch's moving contact to achieve triggering at different rotation angles. Alternatively, it can be designed so that the microswitch is triggered after only one revolution of the driving intermittent gear 31. When the toothed area 311 of the active intermittent gear 31 rotates to the toothless arc surface 312 area, in order to ensure that the active and driven intermittent gears do not misalign when rotating forward and backward, and to ensure the accuracy of the output angle of the signal output shaft 4, the synchronous plate 33 on the active intermittent gear 31 moves the synchronous pin 34 of the driven intermittent gear 32 to ensure this accuracy.

[0055] In this example, the operating mechanism requires the main shaft 1 to rotate 42 times from closing to opening to grounding, and the total stroke of the moving contact is 336mm (of course, other examples may have different numbers of rotations and strokes). The reduction ratio of the entire stroke is (28:71)×(28:71)×(35:63)×(15:63)=0.0206.

[0056] Therefore, the full output angle of signal output shaft 4 is 42 revolutions × 0.0206 × 360° = 311.5° (of course, other examples may have different reduction ratios). This ensures that the actuator on the trigger plate will not repeatedly trigger the micro switch beyond one revolution during the entire process.

[0057] Simultaneously, because the intermittent transmission is in the engagement zone at the moment the microswitch is triggered, the real-time transmission ratio is 1:1, and the total reduction ratio is (28:71)×(28:71)×(35:63)=0.086. That is, when the main shaft rotates 1 / 8 revolution, the moving contact moves 1 mm, and the signal output shaft rotates 3.89°. In this embodiment, the outer diameter of the trigger disk actuator is 60mm, and the outer circumference has shifted by 2.04mm. Under this ratio, the micro switch triggering error caused by various mechanical cumulative errors will appear in the position error of the three-position moving contact by a reduction of about 1 / 2.

[0058] If intermittent gear transmission is not used for speed reduction, in order to ensure that the signal output shaft rotates less than one revolution when the moving contact is in full position of the three-position, a conventional 15:63 reduction gear set is used to achieve the same total reduction ratio (considering the tooth undercut problem, the number of teeth of the active intermittent gear 31 should be greater than 17, but the reduction ratio can still be calculated as 15:63). At this time, the total reduction ratio is (28:71)×(28:71)×(35:63)×(15:63)=0.0206, that is, when the main shaft rotates 1 / 8 revolution, the moving contact moves 1 mm, and the signal output shaft rotates 0.927°.

[0059] In this embodiment, the outer diameter of the trigger disc actuator is 60mm, and the outer circumference has shifted by 0.49mm. Under this ratio, the micro switch triggering error caused by various mechanical cumulative errors will appear in the three-position moving contact stroke error by approximately twice the proportion. If the same control accuracy as using intermittent gear transmission is to be achieved, the outer diameter of the trigger disc actuator needs to be enlarged by 4 times to 240mm, which greatly increases the overall size of the mechanism.

[0060] In summary, this invention achieves the following two functions through effective structural improvements: 1. By using three sets of series-connected reduction transmissions and small-diameter gear sets, a large reduction ratio (usually between 30:1 and 50:1) is achieved between the main shaft of the mechanism and the output shaft of the trigger disc that triggers the micro switch. This ensures that the rotation angle of the output shaft of the trigger disc that triggers the micro switch is within one revolution, or 360°, during the full stroke of the moving contact of the three-position switch.

[0061] 2. Through intermittent gear transmission, during the movement of the moving contact of the three-position switch driven by the main shaft of the operating mechanism, the trigger disk output shaft only rotates when the moving contact begins to move and during a short stroke before reaching its final position. During the middle stroke of the moving contact's movement, the trigger disk output shaft stops at a certain angle and does not rotate. When the trigger disk output shaft rotates to trigger the microswitch, the reduction ratio of the main shaft and the trigger disk output shaft is independent of the full-turn reduction ratio of the intermittent gear transmission; it is determined solely by the reduction ratio of the two sets of reduction gears. At this point, the reduction ratio is significantly smaller than the total reduction ratio. For example, it can be that only... The ratio is 10:1, which greatly reduces the travel distance of the moving contact corresponding to a unit angle of rotation of the trigger disc output shaft. This reduces the impact of the rotation angle deviation of the trigger disc output shaft on the travel distance deviation of the moving contact caused by the transmission chain, trigger disc, micro switch, and other components or assembly issues. It also facilitates the adjustment of the travel distance when the operating mechanism is used in conjunction with the three-position switch. Large adjustments can be made to the trigger angle between the trigger disc and the micro switch to achieve precise small adjustments to the travel distance of the moving contact. It also means that a smaller outer diameter of the trigger disc can be used to trigger the micro switch with higher control precision, thus achieving miniaturization of the operating mechanism.

[0062] In summary, the combination of reduction gear transmission and intermittent gear transmission can achieve a large reduction ratio between the main shaft of the operating mechanism and the output shaft of the trigger disc, ensuring that the rotation angle of the output shaft of the trigger disc is within one revolution throughout the full stroke of the moving contact of the three-position switch. It can also trigger the micro switch with a smaller reduction ratio. At the same time, it enables the operating mechanism to achieve both overall structural miniaturization and improved precision control of the stroke position of the three-position switch.

[0063] The foregoing has shown and described the basic principles and main features of the invention and the advantages of the invention.

[0064] Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the present invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope. All such changes and modifications fall within the scope of the present invention as claimed, which is defined by the appended claims and their equivalents.

Claims

1. A three-position switch operating mechanism for a gas-insulated switchgear, characterized in that, include: A main shaft of a mechanism, the main shaft of which is driven to rotate by an operating mechanism; The operating mechanism drives the three-position switch via a chain drive and a lead screw, and is also connected to a speed reduction transmission structure for transmitting position signals. The gear reduction system of the speed reduction transmission structure is connected to the main shaft of the mechanism; The output end of the gear reduction system of the speed reduction transmission structure is connected to the input end of the intermittent gear structure. The output end of the intermittent gear structure is connected to a signal output shaft; A position indicator disk is provided on the signal output shaft, and the position indicator disk is provided with mechanical indicator positions for three positions: closed, open, and grounded. A trigger disk is provided on the signal output shaft, and the trigger disk is provided with an actuator that triggers a lateral micro switch; A manual operation slide is provided at the front of the three-position switch operating mechanism. The manual operation slide is provided with a grounding operation hole and an isolation operation hole. The manual operation slide can enable / disable manual grounding operation and enable / disable manual switching operation by moving.

2. The three-position switch operating mechanism for a gas-insulated switchgear as described in claim 1, characterized in that, The operating mechanism is driven to rotate either by a motor or by an operating handle inserted into one end of the main shaft of the mechanism.

3. The three-position switch operating mechanism for a gas-insulated switchgear as described in claim 2, characterized in that, The motor drives the main shaft of the mechanism to move via chain drive.

4. The three-position switch operating mechanism for a gas-insulated switchgear as described in claim 1, characterized in that, The output end of the gear reduction system is meshed with the input end of the intermittent gear structure.

5. A three-position switch operating mechanism for a gas-insulated switchgear as described in claim 1, characterized in that, The gear reduction system is a three-stage reduction gear set, and the reduction ratios of the three-stage reduction gear sets are different.

6. The three-position switch operating mechanism for a gas-insulated switchgear as described in claim 1, characterized in that, The micro switch is a group of micro switches arranged laterally around the trigger disk, and the trigger arm of the micro switch group mates with the outer edge contour of the actuator on the trigger disk.

7. A three-position switch operating mechanism for a gas-insulated switchgear as described in claim 1, characterized in that, The positioning and support of shaft-like parts in each transmission component of the three-position switch operating mechanism are achieved by installing partitions.

8. A three-position switch operating mechanism for a gas-insulated switchgear as described in claim 1, characterized in that, The intermittent gear structure consists of a driving intermittent gear and a driven intermittent gear that mesh with each other; The active intermittent gear has teeth in a fan-shaped area on its circumference, and the rest is a smooth arc surface with a diameter smaller than the root circle. The driven intermittent gear is a full-tooth gear, and the number of teeth on the driven intermittent gear is greater than the number of teeth on the toothed part of the driving intermittent gear.

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