A non-excitation tap changer with in-place operation feel

Abstract

The present invention discloses a non-excitation tapping switch with an in-place operation feel, characterized in that: it comprises a main shaft mounted on an upper and lower support seat, one end of the main shaft is connected to an intermittent motion mechanism, the output end of the intermittent motion mechanism is connected to a moving contact bracket, a moving contact assembly of a wedge structure radially slidingly connected to the moving contact bracket is provided on the moving contact bracket, a static contact column configured with the moving contact assembly is correspondingly arranged in the circumferential direction of the moving contact assembly, and a double roller cam mechanism is also provided on the main shaft and configured with the moving contact support. The present invention utilizes the combination of the intermittent motion mechanism and the double roller cam mechanism, and each cam is equipped with at least two rollers to make the switch have an in-place feel and an in-place sound, and at the same time, the vibration feel can also overcome the membrane resistance of the contact between the moving and static contacts, further improving the reliability of the switch.

Description

Technical Field

[0001] The invention relates to the technical field of off-excitation tap changers, and in particular to an off-excitation tap changer with an in-place operating feel. Background Art

[0002] The wedge-shaped contact structure drum-shaped off-excitation tap changer is a product designed based on the technology introduced from the Soviet Union to China in the 1980s. This off-excitation tap changer has been in use for many years. Due to the high manufacturing precision requirements, limited number of gears, and many defects in operation, it has been gradually eliminated by other structural switches, resulting in this structural switch no longer being produced in China.

[0003] The "A non-excitation tap changer for moving contact after force relief" announced in CN 104465155 B of the Chinese Patent Office has made improvements to the above defects. It mainly includes: a main shaft, a gear indicator rod, a shielding cover, a gear system, a groove wheel system, a contact bracket, a moving contact system, a static contact column system, and a cam system. Through the cooperation of the gear mechanism and the cam system, the tap changer can easily shift gears during the switching process. However, there are the following problems during operation: ① There is no feel or sound of the moving contact in place during the entire shifting process, and it is difficult to determine from the mechanism whether the moving contact of the switch is in place. ② When shifting gears, the moving contact slides and rubs along the surface of the static contact column, which increases the wear of the contact, and is particularly prone to wear and tear of the surface coating of the moving and static contact columns. The metal powder dropped by friction will also contaminate the transformer oil. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a de-excitation tap changer with a small shifting torque and a proper operating feel in view of the deficiencies in the above-mentioned prior art.

[0005] The technical solution adopted by the present invention is: a de-excitation tap changer with a proper operating feel, characterized in that: it includes a main shaft installed on the upper and lower support seats, one end of the main shaft is connected to an intermittent motion mechanism, the output end of the intermittent motion mechanism is connected to a moving contact bracket, a moving contact assembly with a wedge-shaped structure radially slidably connected to the moving contact bracket is provided on the moving contact bracket, a static contact column configured with the moving contact assembly is circumferentially arranged correspondingly, and a double-boss cam mechanism is also provided on the main shaft and configured with the moving contact support.

[0006] According to the above technical solution, the double-boss cam mechanism includes a cam fixedly connected to the main shaft, the highest point of the cam is a plane or a curved surface, and bosses are symmetrically arranged on both sides of the plane or the curved surface on the cam, and the distance between the outermost periphery of the boss and the rotation center of the cam is greater than the distance between the plane or the curved surface and the rotation center of the cam.

[0007] According to the above technical solution, the cam is rectangular and eccentrically connected to the main shaft to form a cam structure. Two adjacent sides of its outer circumference are transitionally connected through a transition arc surface, and the plane or curved surface is configured with the moving contact support.

[0008] According to the above technical solution, the boss is a boss with an outer wall in the shape of an arc.

[0009] According to the above technical solution, rollers are correspondingly arranged at each boss to form a double-roller cam mechanism.

[0010] According to the above technical solution, the moving contact bracket includes an upper moving contact bracket and a lower moving contact bracket, and the two ends of the moving contact support are radially slidably connected to the upper moving contact bracket and the lower moving contact bracket respectively. The upper moving contact bracket is fixedly connected to the groove wheel, and the lower moving contact bracket is connected to the main shaft through a bearing.

[0011] According to the above technical solution, the moving contact assembly includes a moving contact group with a wedge-shaped structure, a moving contact support and a spring group. The moving contact group is connected to the moving contact support through a pin shaft. A spring group is arranged between the moving contact and the moving contact support. The number of the spring groups corresponds to the number of moving contacts.

[0012] According to the above technical solution, an insulator is connected between the upper and lower support seats, and the insulator is a cage-shaped insulator or a cylindrical insulator.

[0013] According to the above technical solution, a crank is provided on the main shaft, and the crank is connected to the moving contact support of the moving contact assembly through the connecting rod of the crank mechanism, so that the moving contact assembly can intermittently rotate with the groove wheel mechanism and can radially slide and retract with the crank mechanism. The crank mechanism includes a crank arranged on the main shaft, a connecting rod mounted on the crank, and a crank support connected to the moving contact support. The connecting rod and the connecting rod support are hinged through a short shaft, wherein the connecting hole hinged to the short shaft is a gap connection.

[0014] According to the above technical solution, the intermittent motion mechanism includes a gear mechanism connected to the main shaft, the output end of the gear mechanism is connected to the grooved wheel mechanism, the grooved wheel of the grooved wheel mechanism is idly mounted on the main shaft and connected to the moving contact bracket.

[0015] The beneficial effects achieved by the present invention are:

[0016] 1. The present invention combines an intermittent motion mechanism with a double-boss cam mechanism. The highest point of the cam is a plane or a curved surface. Arc-shaped bosses are symmetrically arranged on both sides of the plane or the curved surface on the cam. The distance between the outermost periphery of the arc-shaped boss and the rotation center of the cam is greater than the distance between the plane or the curved surface and the rotation center of the cam, so that the switch has a sense of being in place and a sound of being in place. At the same time, the vibration sense can also overcome the membrane resistance of the contact between the moving and static contacts, further improving the reliability of the switch.

[0017] 2. By setting the bosses on both sides of the cam into roller structures, the cam and the moving contact support are in rolling friction, which further reduces the shifting torque and makes shifting easier.

[0018] 3. By setting a crank on the main shaft, the moving contact assembly can rotate intermittently in the circumferential direction and slide radially. When shifting gears, the moving contact does not rub against the static contact column, which makes the switch shift torque small and protects the contact coating from being damaged, thus preventing the metal powder generated by the contact friction from contaminating the transformer oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Table 1 is a diagram of the gear connection mode of a single-phase 5-speed linear regulation off-excitation tap changer provided by an embodiment of the present invention;

[0020] Figure 1 A voltage regulation principle diagram of a single-phase 5-speed linear off-excitation tap changer provided in an embodiment of the present invention;

[0021] Figure 2 A front view of a drum-shaped off-circuit tap changer with a wedge-shaped contact structure provided by an embodiment of the present invention;

[0022] Figure 3 AA view of a drum-type off-circuit tap changer with a wedge-shaped contact structure provided by an embodiment of the present invention;

[0023] Figure 4 BB view of a drum-shaped off-circuit tap changer with a wedge-shaped contact structure provided by an embodiment of the present invention (structure diagram of a sheave mechanism);

[0024] Figures 5-1 to 5-3 A structural diagram of a moving contact assembly of a drum-shaped off-excitation tap changer with a wedge-shaped contact structure provided by an embodiment of the present invention;

[0025] Figures 6-1 to 6-3 A structural diagram of a stationary contact column of a drum-shaped off-excitation tap changer with a wedge-shaped contact structure provided by an embodiment of the present invention;

[0026] Figure 7 A CC view of a drum-shaped off-excitation tap changer with a wedge-shaped contact structure provided by an embodiment of the present invention (crank mechanism structure diagram);

[0027] Figure 8 DD view of a drum-shaped de-energized tap changer with a wedge-shaped contact structure provided by an embodiment of the present invention (roller cam mechanism structure diagram);

[0028] Figures 9-1 to 9-6 A schematic diagram of the shifting process of a drum-shaped off-excitation tap changer with a wedge-shaped contact structure provided by an embodiment of the present invention;

[0029] Fig.10A mechanical limit structure diagram of a drum-shaped off-excitation tap changer with a wedge-shaped contact structure provided by an embodiment of the present invention; DETAILED DESCRIPTION

[0030] The present invention will be further described below in conjunction with the accompanying drawings.

[0031] like Figure 1 , 2 As shown in Figure 3, this embodiment provides a de-excitation tap changer with an in-place operating feel, including a main shaft 3 installed between the upper and lower support seats, an insulating cylinder 23 connected between the two upper and lower support seats, one end of the main shaft 3 is connected to an operating mechanism (the operating mechanism is omitted in the figure), and an intermittent motion mechanism is connected to the upper end of the main shaft 3. The output end of the intermittent motion mechanism is connected to a moving contact bracket, and a moving contact assembly radially slidably connected to the moving contact bracket is provided on the moving contact bracket, and a static contact column 21 configured with the moving contact assembly is arranged in a circumferential direction thereof. A double roller cam mechanism configured with a moving contact support is also provided on the main shaft.

[0032] In this embodiment, the upper and lower wall plates are used to support the main shaft 3, and the upper and lower support seats can be upper and lower wall plates (8, 22), gear mechanism, sheave mechanism, the outer periphery of the sheave 7 of the sheave mechanism and the outer periphery of the lower contact bracket 20 arranged at the lower end of the main shaft are arranged with the support 1 through bearings, and the support 1 is fixed on the upper wall plate 8, and an end cover 2 is arranged on the support 1, and the end cover is provided with a gear observation hole 26, which is convenient for observing the switch gear number 27. The insulator in this embodiment is an insulating cylinder 23, which constitutes a drum-shaped off-excitation tap changer.

[0033] In the present invention, the intermittent motion mechanism includes a gear mechanism connected to the main shaft, the output end of the gear mechanism is connected to the sheave mechanism, the sheave 7 of the sheave mechanism is loosely sleeved on the main shaft 3 and connected to the moving contact bracket. The gear mechanism provides the sheave mechanism with rotational power, including a driving wheel 4 and a driven wheel 5, with a transmission ratio of 9:8 (the static contact column is arranged in 8 equal parts as shown in the figure), the driving wheel set is fixed on the main shaft 3, when the main shaft 3 rotates 405°, the driving wheel 4 rotates 405° synchronously, driving the driven wheel 5 to rotate 360°, and the driven wheel 5 drives the shift fork 6 to rotate 360°.

[0034] like Figure 4As shown, the sheave mechanism includes a sheave 7 and a shift fork 6. The sheave 7 is sleeved on the main shaft. The shift fork 6 is connected to the gear mechanism and the driven wheel. A guide arc 32 is provided on the sheave 7 at intervals in the circumferential direction and is configured with a shift fork lock arc 31 provided on the shift fork. A shift groove 28 is formed between each guide arc and is configured with a shift pin 30 on the shift fork. A limit device for realizing the position limit of the non-excitation tapping switch is provided on the shift fork 6 and is configured with a limit member on the sheave. The shift fork 6 rotates synchronously with the driven wheel 5 of the gear mechanism. The shift pin 30 rotates along the sheave guide arc 29 and enters the shift groove 28. The shift pin 30 rotates 360° to shift the sheave 7 by 45°. There is a gear number 27 on the sheave 7, and the switch gear number 27 is observed through the end cover observation hole 26. The limit device is a fork limit step 41 arranged on the fork shaft above the locking arc, and the limit member is a groove wheel limit step 40 installed at the upper end of the limit gear guide arc. The fork limit step and the groove wheel limit step have the same height, and the two cooperate to achieve circumferential limit. When the switch is turned to the limit gear, the groove wheel limit step 40 and the fork limit step 41 of the non-transmission part of the groove wheel mechanism are used for limit (such as Fig.10 The mechanical limit strength is improved to prevent the switch from shifting to neutral. Moreover, the shift fork limit step 41 is symmetrically arranged along the central axis of the shift fork, and the groove wheel limit step 40 is symmetrically arranged along the center line of the guide arc, that is, both sides are provided with limit, so that the groove wheel mechanism can realize shifting in both clockwise and counterclockwise directions.

[0035] The moving contact bracket includes an upper moving contact bracket 9 and a lower moving contact bracket 20. Both ends of the moving contact support 10 are radially slidably connected to the upper moving contact bracket 9 and the lower moving contact bracket 20 respectively. The upper moving contact bracket is fixedly connected to the groove wheel 7 and rotates synchronously with the groove wheel 7. The lower moving contact bracket 20 is connected to the main shaft 3 and the lower wall plate through bearings at the inside and outside.

[0036] like Figures 5-1 to 5-3 As shown, the moving contact assembly includes a moving contact group, a moving contact support 10 and a spring, and the two ends of the moving contact support 10 are respectively connected to the upper moving contact support 9 and the lower moving contact support 20. The moving contact group includes a plurality of moving contacts 12, which are overlapped and sleeved on the pin shaft 13 from top to bottom in sequence, and a spring clamping groove 34 is symmetrically provided on the inner side of the moving contact, and a plurality of spring mounting holes 33 are arranged at intervals from top to bottom on one side of the moving contact support. The number of the spring group corresponds to the number of the moving contacts, one end of the spring group is arranged in the spring mounting hole 33, and the other end is clamped in the moving contact spring clamping groove 34, and the two ends of each of the pin shafts 13 are respectively connected to the two ends of the moving contact support, and the other side of the moving contact support 10 is connected to the crank, so that the moving contact assembly can rotate circumferentially and move radially.

[0037] Among them, the moving contact 12 is wedge-shaped, and when the contact point tangent angle a is between 30° and 90°, it has the characteristics of large contact pressure, small contact spring force and reliable contact. In the present invention, the pin shaft 13 can be one or more. In this embodiment, a pin shaft is selected to be installed in the center position of the moving contact group, so that it has the advantage of floating freely. That is, the pin shaft 13 is installed in the oval pin shaft hole in the middle of the moving contact 12, and a pin shaft 13 is passed through the moving contact support 10, so that the moving contact moves around a pin shaft and floats freely, completely eliminating the possible jamming phenomenon between the pin shaft and the moving contact, and ensuring reliable contact of the switch. In this embodiment, each moving contact is equipped with 2 springs 11 (a spring group), and the two points of the two springs are supported to ensure the stability of the moving contact. One end of the spring is installed in the spring mounting hole 33 of the moving contact support, and the other end is stuck in the spring slot 34 of the moving contact, so that the spring is always kept in the spring slot 34 of the moving contact without deviation during the switch shifting process, thereby improving the contact reliability of the moving contact, avoiding the spring end from being skewed and reducing the contact pressure, or falling off and getting stuck and unable to change the gear. The springs of the two adjacent moving contacts above and below are staggered (that is, the center distances L and L1 of the spring slots of the two adjacent moving contacts 12-1 and 12-2 are not equal), reducing the distance between the two adjacent moving contacts, and reducing the height of the entire moving contact group under the same number of moving contacts, so as to reduce the weight of the switch and reduce the stiffness requirements for the switch main shaft 3 and the static contact column 21. The upper and lower ends of the moving contact support 10 are provided with radial sliding parts for sliding configuration with the radial sliding groove on the moving contact support, and a boss is provided on the outside, and the outer wall of the boss is a plane for configuration with the double roller cam mechanism.

[0038] like Figure 6-1 , 6-2 6-3, the static contact column assembly consists of 8 static contact columns 21 fixed on the upper wallboard 8 and the lower wallboard 22, and the upper and lower wallboards are fixed on the insulating tube 23, wherein the parts of the three static contact columns 21-X are flat structures 36, the plane of the guide copper bar 24 fits with the flat surface of the static contact column through the fasteners in the guide copper bar installation hole 37, and the three static contact columns 21-X are connected in parallel through the guide copper bar, and the lead 25 is connected to the lead connection hole 35 of the static contact column as a whole by cold pressing or welding. Its gear connection method is shown in Table 1.

[0039] like Figure 8As shown, the double-boss cam mechanism includes a cam 19 fixedly connected to the main shaft, the highest point of the cam 19 is a plane or a curved surface, and arc-shaped bosses (similar to cylindrical curved surfaces) are symmetrically arranged on both sides of the plane or the curved surface on the cam 19, and the distance between the outermost periphery of the arc-shaped boss and the rotation center of the cam is greater than the distance between the plane or the curved surface and the rotation center of the cam, so that the switch has a sense of being in place and a sound of being in place, and at the same time, the vibration sense can also overcome the membrane resistance of the contact between the moving and static contacts, and the rolling friction between the roller and the moving contact support 10 reduces the shifting torque. Among them, there are at least two rollers, and this embodiment is described by taking the roller (18, 38) as an example. In this embodiment, the cam can be of various shapes, and this embodiment is described by taking the cam as a rectangle as an example, and the adjacent sides of the outer wall are transitionally connected by a transition arc surface, and the cam end face between the two bosses on the cam 19 is planar, so that it has a better sense of being in place and a sound of being in place. As shown Figure 9-5 As shown, the distance L4 between the outermost periphery of the arc-shaped boss (ie, located at 45° in the horizontal or longitudinal direction of the boss) and the rotation center of the cam is greater than the distance L3 between the plane or curved surface and the rotation center of the cam.

[0040] In this embodiment, in order to reduce the shifting torque, the sliding friction between the boss and the moving contact assembly can be converted into rolling friction, that is, the bosses on both sides of the cam are set as roller structures to form a double-roller cam structure, that is, rollers (18, 38) are set. By setting the bosses on both sides of the cam as roller structures, the membrane resistance of the contact between the moving and static contacts can be overcome, and the cam and the moving contact support are made into rolling friction, which further reduces the shifting torque and makes shifting easier.

[0041] The cam 19 is fixed on the main shaft 3 and rotates synchronously with the main shaft 3. When in the working position, it applies pressure to the moving contact assembly to ensure that the moving contact and the static contact column are in reliable contact. During the gear shifting process, the cam 19 rotates to disengage from the moving contact support 10 to release the pressure, so that the torque during the gear shifting is smaller. Two rollers are installed on the cam 19. When one of the rollers rolls to the center of the moving contact support during the gear shifting and the downshifting, the overtravel compression spring 11 is compressed. At this time, the spring 11 is in the maximum compression state and the pressure is the maximum. When one of the rollers rolls over the center of the moving contact support, the impact force after the spring 11 is released causes the rollers to automatically roll at high speed until the two rollers contact the moving contact support 10, accompanied by a contact sound, so that the tap switch has a sense of being in place and a sound of being in place. At the same time, the vibration sense can also overcome the membrane resistance of the contact between the moving and static contacts, and the rolling friction of the rollers further reduces the switch shifting torque. The double roller cam mechanism in this embodiment can be one or more. This embodiment is described by taking two rollers installed above and below as an example.

[0042] In order to protect the contact coating from being damaged, prevent the metal powder generated by contact friction from polluting the transformer oil, and further reduce the shifting torque, a crank is also provided on the main shaft 3, which is connected to the moving contact support of the moving contact assembly through a connecting rod, so that the moving contact assembly can be intermittently rotated with the grooved wheel mechanism and can be radially slid and retracted with the crank mechanism. The main shaft 3 is driven to rotate by the operating mechanism, and the main shaft 3 drives the gear mechanism and the grooved wheel mechanism to rotate intermittently. The grooved wheel mechanism then drives the moving contact assembly to rotate intermittently through the moving contact support. While the main shaft 3 rotates, the moving contact assembly is driven to slide and retract radially through the crank mechanism, so that the moving contact assembly can be intermittently rotated circumferentially and can slide radially. When shifting, the moving contact does not rub against the static contact column, so that the switch shifting torque is small, and the contact coating is protected from being damaged, and the metal powder generated by contact friction is prevented from polluting the transformer oil.

[0043] Specifically, Figure 7 As shown, the crank mechanism includes a connecting rod support 16, a connecting rod 14 and a short shaft 15. The connecting rod support 16 is fixedly connected to the moving contact support 10, and the connecting rod 14 is mounted on the crank of the main shaft 3. The connecting rod 14 and the connecting rod support 16 are movably connected through the short shaft 15. The present invention uses the crank mechanism to pull the moving contact assembly back to the central low point of the stationary contact column assembly so that the moving contact and the stationary contact column do not generate friction during gear shifting. The main shaft 3 continues to rotate, and the crank mechanism pushes the moving contact mechanism to a predetermined working position. The crank mechanism in this embodiment can be one or more, and this embodiment is described by taking one as an example.

[0044] When the crank mechanism and the double roller cam mechanism work together, in order to prevent interference or jamming, the connecting hole hinged to the short shaft 15 is an oval hole, so that the operation is more flexible.

[0045] Here’s how it works:

[0046] Take the switch in working position 3 as an example. Figure 4 As shown, the groove wheel locking arc 32 is meshed with the shift fork locking arc 31, so that the groove wheel 7 cannot rotate at a fixed angle position, thereby ensuring the precise positioning of the moving contact. Figure 7 As shown, the crank mechanism is in a straight line with the main shaft 3 and the moving contact support 10, and the crank mechanism is not subjected to force. Figure 8 As shown, the roller cam mechanism pushes the moving contact assembly cam to the contact position in the radial direction, and the pressure of the spring 11 makes the moving contact and the stationary contact column contact reliably (that is, the stationary contact column 21-X is in contact with 21-3 and the moving contact).

[0047] Taking the switch changing from 3rd gear to 2nd gear as an example, the shifting process is as follows:

[0048] like Figure 9-1As shown, when the main shaft 3 rotates about 21°, one of the rollers 18 of the roller cam mechanism rolls to the center 39 of the moving contact support. At this time, the compression of the spring 11 reaches the maximum state (greater than the pressure in the working position). At this time, the shift fork 6 rotates about 18.6°, the shift pin 30 does not enter the shift groove 28, and the groove wheel 7 does not shift. At this time, the moving contact is still in the contact position. Continue to rotate the main shaft 3. When the roller 18 rolls over the center of the moving contact support, the spring 11 automatically releases the pressure, forcing the roller 18 to roll off the moving contact support 11 at a high speed. When the cam hits and contacts the moving contact support, a sound is generated, causing the switch moving contact to have a sound when it is downshifted.

[0049] like Figure 9-2 As shown, when the main shaft 3 continues to rotate to 126.5°, the shift fork 6 rotates about 112.5°, the shift pin 30 begins to enter the shift slot 28, the shifting groove wheel 7 rotates, and the groove wheel 7 drives the moving contact assembly to move in the direction of gear 2. At the same time, the crank mechanism pulls the contact assembly radially toward the center, so that the moving contact assembly and the stationary contact column assembly are completely separated, avoiding friction between the moving contact and the stationary contact column during the gear shifting process.

[0050] like Figure 9-3 As shown, when the main shaft 3 continues to rotate to 202.5°, the shift fork 6 rotates 180°, the shift pin 30 shifts the groove wheel 7 to rotate 22.5°, and the moving contact assembly rotates 22.5° in the direction of the 2nd gear. At the same time, the crank mechanism pulls the moving contact assembly to the lowest point to avoid friction between the moving contact and the stationary contact column during the gear shifting process.

[0051] like Figure 9-4 As shown, when the main shaft 3 continues to rotate to 278.5°, the shift fork 6 rotates 247.5°, the shift pin 30 shifts the groove wheel 7 to rotate 45°, the shift pin 30 shifts out of the shift groove 28, the groove wheel 7 stops rotating, and the moving contact assembly rotates 45° in the direction of the second gear to reach the predetermined position of the second gear. At the same time, the crank mechanism pushes the moving contact assembly radially outward.

[0052] like Figure 9-5 As shown, when the main shaft 3 continues to rotate to 384°, the shift fork 6 rotates 341.4°, and the groove wheel 7 no longer rotates. The crank mechanism continues to push the moving contact assembly radially outward, and at the same time the roller cam mechanism rotates 384°. When the roller 2 38 rolls to the center 33 of the moving contact support, the compression of the spring 11 reaches the maximum state (greater than the pressure in the working position). The main shaft 3 continues to rotate. When the roller 2 38 rolls over the center of the moving contact support, the spring 11 automatically releases the pressure, forcing the roller 2 38 to roll at a high speed until the two rollers collide with the moving contact support 11. A sound is heard at the moment of collision, causing the moving contact to be in place with a sound. The main shaft 3 passively rotates to 405°, and the shifting process of the switch from gear 3 to gear 2 is completed. As shown Figure 9-6As shown, at this time, the gear position number 27 indicated in the gear position observation hole 26 is gear 2, and the groove wheel locking arc 32 is engaged with the shift fork locking arc 31, so that the groove wheel 7 cannot rotate at a fixed angle position, thereby ensuring the precise positioning of the moving contact. At this time, the pressure of the spring 11 makes the moving contact reliably contact with the static contact column (that is, the static contact columns 21-2 and 21-X are in contact with the moving contact).

[0053] Similarly, after rotating the main shaft 3 clockwise to change the switch from the 2nd gear to the 1st gear position (Note: there is a 0th gear position between the 2nd gear and the 1st gear, and the 0th gear is a non-working gear position and is prohibited from being used in the 0th gear position. In addition, the 0th gear position between the 4th gear and the 5th gear is the same, see Table 1), continue to rotate the main shaft 3 clockwise, and the shift fork 6 continues to rotate counterclockwise in the direction of the arrow until the groove wheel limit 40 presses against the shift fork limit 41 and cannot continue to rotate. The switch mechanical limit is to ensure that the position of the moving contact is consistent with the gear position indication position, such as Fig.10 Similarly, after reaching the 5th gear, the main shaft cannot continue to rotate counterclockwise.

[0054] The above embodiment takes a 5-speed linear adjustment tap changer as an example. At this time, the division degree of the groove wheel and the static contact column is 45°, and the division degree can also be 60°, 36°, etc. The number of gears can be 3, 5, 7, 9, etc., and can be specifically designed according to actual working conditions.

[0055] Table 1:

[0056]

Claims

1. A de-excitation tap changer with a proper operating feel, characterized in that: It includes a main shaft mounted on the upper and lower support seats, one end of the main shaft is connected to an intermittent motion mechanism, the output end of the intermittent motion mechanism is connected to a moving contact bracket, a moving contact assembly of a wedge-shaped structure radially slidably connected to the moving contact bracket is provided on the moving contact bracket, and a static contact column configured with the moving contact assembly is arranged in a circumferential direction thereof, and a double-boss cam mechanism is also arranged on the main shaft and configured with the moving contact support, the double-boss cam mechanism includes a cam fixedly connected to the main shaft, the highest point of the cam is a plane or a curved surface, and bosses are symmetrically arranged on both sides of the plane or the curved surface on the cam, so that The distance between the outermost periphery of the boss and the rotation center of the cam is greater than the distance between the plane or curved surface and the rotation center of the cam. A crank is provided on the main shaft, and the crank is connected to the moving contact support of the moving contact assembly through a connecting rod of the crank mechanism, so that the moving contact assembly can be intermittently rotated with the groove wheel mechanism and can be radially slid and retracted with the crank mechanism. The crank mechanism includes a crank arranged on the main shaft, a connecting rod mounted on the crank, and a crank support connected to the moving contact support. The connecting rod and the crank support are hinged through a short shaft, wherein the connecting hole hinged to the short shaft is a gap connection.

2. The de-excitation tap changer with in-place operation feel according to claim 1, characterized in that: The cam is rectangular and eccentrically connected to the main shaft to form a cam structure. Two adjacent sides of the outer circumference are transitionally connected through transition arc surfaces, and the plane or curved surface is configured with the moving contact support.

3. The de-energized tap changer with a proper operating feel according to claim 1, characterized in that: The boss is a boss with an outer side wall in the shape of an arc.

4. The de-excitation tap changer with in-place operation feel according to claim 1, characterized in that: A roller is correspondingly arranged at each boss to form a double-roller cam mechanism.

5. The de-excitation tap changer with in-place operation feel according to claim 1, characterized in that: The moving contact bracket comprises an upper moving contact bracket and a lower moving contact bracket, and both ends of the moving contact support are radially slidably connected to the upper moving contact bracket and the lower moving contact bracket respectively. The upper moving contact bracket is fixedly connected to the groove wheel, and the lower moving contact bracket is connected to the main shaft through a bearing.

6. The de-energized tap changer with a proper operating feel according to claim 1, characterized in that: The moving contact assembly includes a moving contact group with a wedge-shaped structure, a moving contact support and a spring group. The moving contact group is connected to the moving contact support through a pin shaft. A spring group is arranged between the moving contact and the moving contact support. The number of the spring groups corresponds to the number of the moving contacts.

7. The de-energized tap changer with in-place operation feel according to claim 1, characterized in that: An insulator is connected between the upper and lower support seats, and the insulator is a cage-shaped insulator or a cylindrical insulator.

8. The de-energized tap changer with in-place operation feel according to claim 1, characterized in that: The intermittent motion mechanism comprises a gear mechanism connected to the main shaft, the output end of the gear mechanism is connected to a grooved wheel mechanism, the grooved wheel of the grooved wheel mechanism is sleeved on the main shaft and connected to the moving contact bracket.

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