On-load tap-changer

Abstract

The invention discloses an on-load tap-changer which comprises a first mounting plate, a second mounting plate, a third mounting plate and a central shaft, the central shaft penetrates through and is mounted on all the mounting plates at the same time, a plurality of windings and a main static contact are mounted on the first mounting plate, and the second mounting plate is mounted on the third mounting plate. The central shaft is fixedly provided with a rotating disc and an indicating disc which are respectively positioned on the front side and the rear side of the second mounting plate, the rotating disc is provided with a main static contact which is in contact with one main static contact, the periphery of the indicating disc is provided with a plurality of indicating arms which are arranged in a ring shape, and each indicating arm is provided with different indicating numbers; a motor and a gear indicating window are further installed on the third installation plate, the motor is in transmission connection with the indicating dial through indicating arms, and the gear indicating window directly faces the indicating number on one indicating arm. The tap switch has the beneficial effects that an operator can quickly judge the gear of the tap switch through the gear indication window, and the multi-layer structural design is also convenient to maintain and detect the tap switch.

Description

Technical Field

[0001] The invention belongs to the technical field of tap changers, and in particular relates to an on-load tap changer. Background Art

[0002] On-load tap changer is a voltage regulating device suitable for operation under transformer excitation or load, used to change the tapping connection position of transformer winding. Its basic principle is to switch the moving contact or tap in the transformer winding without interrupting the load current, thereby changing the number of turns of the winding, that is, the voltage ratio of the transformer, and finally achieving the purpose of voltage regulation.

[0003] Most existing on-load tap changers are installed in an integrated manner, that is, all components including the moving contact are installed on the same mounting plate. After being driven by the motor, the position of the moving contact is switched. In actual use, this type of tap changer has the following disadvantages: (1) Since the internal structure of the tap changer is mostly separated from the outside world, and the tap changer itself is not provided with a component for indicating the state of the tap changer, the operator cannot directly judge the working state of the tap changer, which is inconvenient; (2) All components of the tap changer are arranged on the same mounting plate. No matter which component is to be repaired or inspected, the operator needs to open the entire tap changer. The maintenance process is cumbersome and easy to cause damage or loss of irrelevant components. Summary of the invention

[0004] The existing on-load tap changer is installed in an integrated manner and is not provided with a component for indicating the state of the tap changer itself. On the one hand, it is not convenient for maintenance and inspection, and on the other hand, it is not convenient for operators to directly judge its state. It is quite inconvenient. In order to solve the above problems, the following invention is proposed: A load tap changer comprises a first mounting plate, a second mounting plate, a third mounting plate and a central axis, wherein the central axis penetrates and is simultaneously mounted on the first mounting plate, the second mounting plate and the third mounting plate, a plurality of windings arranged in a ring shape and main static contacts mounted on the windings are mounted on the first mounting plate, a rotating disk and an indicating disk are fixedly mounted on the central axis, the rotating disk is located between the first mounting plate and the second mounting plate, an active contact in contact with one of the main static contacts is also mounted on one side of the rotating disk, the indicating disk is located between the second mounting plate and the third mounting plate, and a plurality of indicating arms arranged in a ring shape are provided thereon, each indicating arm is provided with a different indicating number, a motor and a gear indicating window are also mounted on the third mounting plate, the motor is transmission-connected to the indicating disk through the indicating arm, and the gear indicating window is directly opposite to the indicating number on one of the indicating arms. Driven by the motor, the indicator disk will rotate along with the rotation, thereby driving the active contact to switch to contact with other main static contacts. The position of each active contact will correspond to an indication number, and the state of the tap switch can be quickly determined through the gear position indication window.

[0005] Furthermore, it also includes a driving disk installed on the third mounting plate, a driving rod located between the second mounting plate and the third mounting plate is provided on the inner side of the driving disk, the motor is transmission-connected with at least one driving gear, one of the driving gears is transmission-connected with the outer side of the driving disk through a chain, a transmission tooth is provided at the end of the indicating arm, and the driving rod cooperates with the transmission tooth to realize the transmission connection between the motor and the indicating disk.

[0006] Furthermore, a connecting arm is provided on the outer side of the driving disk, and the connecting arm is elastically connected to the third mounting plate through a spring. The driving disk pushes the indicating arm to move through the driving rod, and the connecting arm also rotates and drives the spring to undergo elastic deformation. After the transmission tooth of the next indicating arm moves to the bottom of the driving rod, the driving disk is driven by the spring to rotate in the opposite direction, and the driving rod re-engages in the transmission tooth.

[0007] Furthermore, two polarity static contacts are installed on the first mounting plate, and a transmission rod is movably installed on the inner side of the second mounting plate. The transmission rod is transmission-connected with a transmission arm, and a polarity moving contact in contact with one of the polarity static contacts is fixedly installed on the transmission arm.

[0008] Furthermore, a driving head is provided on one side of the rotating disk, and a driving groove is provided on one side of the transmission rod. After the rotating disk rotates, the driving head enters the driving groove and drives the transmission arm to rotate. After the transmission arm rotates, it drives the moving contact of one polarity to switch to contact with the static contact of the other polarity.

[0009] Furthermore, the transmission arm is also connected to a connecting column that passes through the second mounting plate and the third mounting plate outwardly, a polarity pointer is provided at the end of the connecting column, and a polarity indicating portion located below the polarity pointer is provided on the outer side of the third mounting plate.

[0010] Furthermore, a plurality of main shaft blocks arranged in a ring shape and in close contact with the central axis are provided between the first mounting plate and the rotating disk, and annular springs are sleeved on the outer sides of the main shaft blocks to fix them to each other, making the whole more stable and reliable.

[0011] The present invention proposes an on-load tap changer, which has the beneficial effects of: adopting a multi-layer mounting plate structure, according to the position of the components that need to be repaired and inspected, the operator only needs to remove the corresponding mounting plate without having to disassemble the entire tap changer, which is relatively time-saving and labor-saving. At the same time, the operator can quickly determine the current state of the tap changer through the gear position indicator window and the polarity pointer, which is relatively convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a three-dimensional structural schematic diagram of the on-load tap changer of the present invention; Figure 2 The internal structure of the on-load tap changer of the present invention is shown in FIG. Figure 1 ; Figure 3 The internal structure of the on-load tap changer of the present invention is shown in FIG. Figure 2 ; Figure 4 It is a schematic diagram of the cooperation between the indicator disk and the driving disk in the present invention; Figure 5 It is a three-dimensional structural schematic diagram of the central axis and some components in the present invention.

[0013] The corresponding relationship between the illustrations and component names in the figure is as follows: 1. First mounting plate; 2. Second mounting plate; 3. Third mounting plate; 4. Central axis; 11. Winding; 12. Main static contact; 13. Active contact; 14. Polarity static contact; 15. Polarity moving contact; 21. Indicator plate; 22. Indicator arm; 23. Transmission tooth; 24. Connecting column; 31. Motor; 32. Driving gear; 33. Chain; 34. Driving plate; 35. Driving rod; 36. Gear position indicating window; 37. Polarity indicating part; 38. Spring; 39. Connecting arm; 40. Polarity pointer; 41. Spindle block; 42. Ring spring; 43. Rotating plate; 44. Transmission rod; 45. Transmission arm; 46. Driving head; 47. Driving slot. DETAILED DESCRIPTION

[0014] The technical solution of the present invention will be clearly and completely described below in conjunction with embodiments.

[0015] Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative work should fall within the scope of protection of this application.

[0016] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so as to describe the embodiments of the present application described herein.

[0017] In addition, the terms "installed", "set", "provided with", "connected", "connected", and "sleeved" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; the movable connection can be a bearing connection or other movable connections; it can be a direct connection, or an indirect connection through an intermediate medium, or an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0018] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present invention and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0019] like Figure 1-Figure 3As shown, it is a preferred embodiment of the present invention, an on-load tap changer, comprising a first mounting plate 1, a second mounting plate 2, a third mounting plate 3, and a central shaft 4, wherein the central shaft 4 penetrates through and is movably mounted on the first mounting plate 1, the second mounting plate 2, and the third mounting plate 3 in sequence, a plurality of windings 11 arranged in a ring are mounted on the first mounting plate 1, each winding 11 is mounted with a main static contact 12, a rotating disk 43 and an indicating disk 21 are also fixedly mounted on the central shaft 4, the rotating disk 43 is located between the first mounting plate 1 and the second mounting plate 2, and the rotating disk 43 is located between the first mounting plate 1 and the second mounting plate 2. An active contact 13 is also fixedly mounted on one side of the rotating disk 43, and the active contact 13 is in contact with one of the main static contacts 12. The indicator disk 21 is located between the second mounting plate 2 and the third mounting plate 3. A plurality of indicator arms 22 arranged in a ring are provided on the periphery of the indicator disk 21, and each indicator arm 22 is provided with a different indicator number. A motor 31 and a gear indicator window 36 are also installed on the outer side of the third mounting plate 3. The motor 31 is transmission-connected to the indicator disk 21 through the indicator arm 22, and the gear indicator window 36 is directly opposite to the indicator number on one of the indicator arms 22.

[0020] In actual use, after the motor 31 is powered on, the indicator arm 22 is driven to rotate through the output end. After the indicator arm 22 rotates, the indicator disk 21 is also driven to rotate. After the indicator disk 21 rotates, the entire central shaft 4 rotates, and finally the main static contact 12 contacted by the active contact 13 is switched by the rotation of the rotating disk 43. Correspondingly, when the active contact 13 contacts different main static contacts 12, the indicator arm 22 corresponding to the position of the main static contact 12 on the rotating disk 43 will also rotate to the rear of the gear indicator window 36. By reading the indication number on the indicator arm 22, the gear state of the tap switch at this time can be determined, which is more convenient. When the motor 31 needs to be repaired and inspected, there is no need to remove the mounting plate. When the indicator disk 21 needs to be repaired and inspected, it is only necessary to remove the third mounting plate 3, so that the active contact 13 and the main static contact 12 in the tap switch are not exposed to the outside, reducing the possibility of unnecessary damage.

[0021] The following further describes how the motor 31 realizes the transmission connection with the indicator plate 21. A driving plate 34 is also movably installed on the third mounting plate 3 and penetrates the third mounting plate 3. The inner side of the driving plate 34 is located between the second mounting plate 2 and the third mounting plate 3. A driving rod 35 is provided on the driving plate 34. A plurality of mutually meshing driving gears 32 are transmission-connected to the input end of the motor 31. The driving gear 32 at the end of the transmission is transmission-connected to the outer side of the driving plate 34 through a chain 33. Figure 4As shown, a semicircular transmission tooth 23 is also provided at the end of the indicator arm 22, and the driving rod 35 is also semicircular and matched with the transmission tooth 23. After the motor 31 rotates, the driving rod 35 rotates, thereby pushing the indicator arm 22 currently matched therewith to move, and then the driving rod 35 disengages from the transmission tooth 23 of the indicator arm 22, and the transmission tooth 23 of the next indicator arm 22 moves to the position matched with the driving rod 35. Further, a connecting arm 39 is fixedly provided on the outer side of the driving disk 34, and the connecting arm 39 is elastically connected to the third mounting plate 3 through a spring 38. During the movement of the next indicator arm 22, the connecting arm 39 rotates and stretches the spring 38. After the indicator tooth of the next indicator arm 22 completely moves to the bottom of the transmission rod 44, the spring 38 drives the rotating disk 43 to rotate in the opposite direction, so that the driving rod 35 cooperates with the transmission tooth 23 to complete the gear switching of the tap changer.

[0022] In this embodiment, two polarity static contacts 14 are also installed on the first mounting plate 1, corresponding to the positive polarity state and the negative polarity state of the tap switch respectively. A transmission rod 44 that fits with the rotating disk 43 is also movably installed on the inner side of the second mounting plate 2. The transmission rod 44 is transmission-connected with a transmission arm 45, and a polarity moving contact 15 that contacts one of the polarity static contacts 14 is fixedly installed on the transmission arm 45. After the transmission rod 44 rotates, it drives the transmission arm 45 to rotate, and finally the polarity moving contact 15 switches to contact with the other polarity moving contact 15.

[0023] Furthermore, a driving head 46 is provided on one side of the rotating disk 43, and a driving slot 47 is provided on one side of the transmission rod 44. When the rotating disk 43 rotates beyond a certain angle, the driving head 46 will enter the driving slot 47. When the rotating disk 43 continues to rotate, the driving head 46 will drive the transmission rod 44 to rotate, so as to realize the switching state of the polarity moving contact 15. Further, the transmission arm 45 is also connected to a connecting column 24 that penetrates the second mounting plate 2 and the third mounting plate 3 outwardly, and a polarity pointer 40 is provided at the end of the connecting column 24. A polarity indicating part 37 located below the polarity pointer 40 is provided on the outer side of the third mounting plate 3, and an indicating mark is provided on the polarity indicating part 37. When the state of the polarity moving contact 15 changes, the polarity pointer 40 rotates accordingly and points to the corresponding indicating mark in the polarity indicating part 37.

[0024] Furthermore, if Figure 5 As shown, a plurality of spindle blocks 41 arranged in a ring shape and fitting the central axis 4 are provided between the first mounting plate 1 and the rotating disk 43, and an annular spring 42 is sleeved on the outer side of the spindle block 41 to fix them to each other, so that the overall fixation is relatively stable, and one end of the connecting shaft is movably mounted on the first mounting plate 1 through a shaft column to facilitate the operator to disassemble the connecting shaft.

[0025] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. An on-load tap changer, characterized in that: The invention comprises a first mounting plate (1), a second mounting plate (2), a third mounting plate (3), and a central shaft (4); the central shaft (4) penetrates through and is simultaneously mounted on the first mounting plate (1), the second mounting plate (2), and the third mounting plate (3); a plurality of windings (11) arranged in an annular shape and main static contacts (12) mounted on the windings (11) are mounted on the first mounting plate (1); a rotating disk (43) and an indicating disk (21) are fixedly mounted on the central shaft (4); the rotating disk (43) is located between the first mounting plate (1) and the second mounting plate (2); and a rotating disk (43) is disposed on one side of the rotating disk (43). An active contact (13) in contact with one of the main static contacts (12) is also installed. The indicator plate (21) is located between the second mounting plate (2) and the third mounting plate (3). A plurality of indicator arms (22) arranged in a ring are also provided around the indicator plate (21). Each indicator arm (22) is provided with a different indicator number. A motor (31) and a gear position indicator window (36) are also installed on the third mounting plate (3). The motor (31) is transmission-connected to the indicator plate (21) via the indicator arm (22). The gear position indicator window (36) is directly opposite to the indicator number on one of the indicator arms (22).

2. The on-load tap changer according to claim 1, characterized in that: It also comprises a driving disk (34) which is installed through the third mounting plate (3); a driving rod (35) is provided on the inner side of the driving disk (34) and is located between the second mounting plate (2) and the third mounting plate (3); the motor (31) is drivingly connected to at least one driving gear (32); one driving gear (32) is drivingly connected to the outer side of the driving disk (34) through a chain (33); a driving tooth (23) is provided at the end of the indicating arm (22); the driving rod (35) cooperates with the driving tooth (23) to achieve a driving connection between the motor (31) and the indicating disk (21).

3. The on-load tap changer according to claim 2, characterized in that: A connecting arm (39) is provided on the outer side of the driving disk (34), and the connecting arm (39) is elastically connected to the third mounting plate (3) via a spring (38).

4. The on-load tap changer according to claim 3, characterized in that: Two polarity stationary contacts (14) are also mounted on the first mounting plate (1), and a transmission rod (44) is movably mounted on the inner side of the second mounting plate (2), the transmission rod (44) being transmission-connected to a transmission arm (45), and a polarity moving contact (15) in contact with one of the polarity stationary contacts (14) is fixedly mounted on the transmission arm (45).

5. The on-load tap changer according to claim 4, characterized in that: A driving head (46) is provided on one side of the rotating disk (43), and a driving slot (47) is provided on one side of the transmission rod (44); after the rotating disk (43) rotates, the driving head (46) enters the driving slot (47) and drives the transmission arm (45) to rotate; after the transmission arm (45) rotates, it drives the moving contact (15) of one polarity to switch to contact with the stationary contact (14) of the other polarity.

6. The on-load tap changer according to claim 5, characterized in that: The transmission arm (45) is also connected to a connecting column (24) that penetrates outwardly through the second mounting plate (2) and the third mounting plate (3); a polarity pointer (40) is provided at the end of the connecting column (24); and a polarity indicating portion (37) located below the polarity pointer (40) is provided on the outside of the third mounting plate (3).

7. The on-load tap changer according to claim 1, characterized in that: A plurality of main shaft blocks (41) arranged in an annular shape and in close contact with the central axis (4) are provided between the first mounting plate (1) and the rotating disk (43), and a ring spring (42) is sleeved on the outside of the main shaft blocks (41) to fix them to each other.

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