On-load tap changer with safe operation mechanism and transformer

Abstract

The invention belongs to the technical field of transformer voltage regulation switches, and particularly relates to an on-load voltage regulation switch with a safety operation mechanism and a transformer. A switching mechanism; the limiting mechanism is arranged at the top of the shell and used for hindering switching of the switching mechanism; the oil supplementing tank is fixedly connected with the transformer and used for supplementing oil, and the oil supplementing tank is communicated with the oil supplementing channel; the oil collecting mechanism is used for collecting oil, and the oil collecting mechanism is communicated with the oil discharging groove; and the oil pump is used for recycling oil liquid, and the oil supplementing tank and the oil collecting mechanism are both communicated with the oil pump. The limiting mechanism can hinder tapping switching of the switching mechanism along with ascending and descending of the liquid level of oil, the safety during tapping switching operation is improved, the oil supplementing tank can supplement oil to the switching mechanism along with downward movement of the sliding column, and the oil collecting mechanism can collect excessive oil overflowing from the switching mechanism along with upward movement of the sliding column.

Description

Technical Field

[0001] The invention belongs to the technical field of transformer voltage regulating switches, and in particular relates to an on-load voltage regulating switch and a transformer with a safe operating mechanism. Background Art

[0002] The on-load voltage regulator adjusts the voltage by changing the connection mode of the transformer winding without interrupting the power supply, thereby maintaining the voltage stability of the power grid. This switch can be operated when the transformer is in operation, that is, the tap change is completed under the condition of electric load, so it is called "on-load". The on-load voltage regulator is mainly composed of a switch rotor and a housing. When regulating the voltage, the switch rotor rotates in the housing and seamlessly switches from one tap on the housing to another tap, thereby adjusting the output voltage of the transformer. Since the arc temperature generated during tap switching is high and it is easy to cause equipment failure, the switch rotor is usually immersed in oil to extinguish the arc through the oil.

[0003] During use, existing on-load tap-changing switches and transformers generally do not have a safe operating mechanism to limit the switch rotor according to changes in oil volume. Tap switching operations can still be performed when there is too little or too much oil. Since too little or too much oil may make it impossible to extinguish the arc in time, this leads to insufficient safety during tap switching operations. When the oil is too little, there is no mechanism to automatically replenish the oil, and the oil needs to be replenished manually, which is not convenient enough. When there is too much oil, the risk of leakage is easily increased due to the expansion of the oil after a large temperature change, and the safety is insufficient. Summary of the invention

[0004] The object of the present invention is to provide an on-load tap-changing switch and transformer with a safe operating mechanism, which can hinder the tap switching of the switch mechanism through a limit mechanism as the oil level rises and falls, thereby improving the safety during the tap switching operation; the oil replenishing tank can replenish the oil of the switch mechanism as the sliding column moves downward, and the oil collecting mechanism can collect excess oil overflowing from the switch mechanism as the sliding column moves upward.

[0005] The technical solution adopted by the present invention is as follows: An on-load voltage regulating switch and transformer with a safe operating mechanism, comprising: transformer; A switch mechanism, wherein the switch mechanism is arranged at one end of the transformer, the switch mechanism comprises a housing fixedly connected to the transformer, a switch rotor is rotatably connected inside the housing, a motor is arranged above the switch rotor, the motor is fixedly connected to the transformer, an output end of the motor is fixedly connected to the switch rotor, a limit plate is fixedly connected to one end of the switch rotor close to the motor, a plurality of limit grooves are circumferentially provided on the outer side of the limit plate, oil is provided inside the housing, and an oil drain groove is provided on the outer side of the housing; The limit mechanism is arranged on the top of the shell body, and is used to hinder the switching of the switch mechanism. The limit mechanism includes a sliding column slidably connected to the shell body, a sleeve is arranged on the outside of the sliding column, the sliding column and the sleeve are slidably matched in the vertical direction, the sleeve is fixedly connected to the shell body, the lower end of the sliding column is fixedly connected with a floating block, an open groove is provided on the side of the sliding column close to the limit plate, the upper end of the open groove is fixedly connected with a first limit block, and the lower end of the open groove is fixedly connected with a second limit block, the first limit block and the second limit block are both slidably matched with the limit groove in the vertical direction, an oil replenishing channel and an oil draining channel are provided inside the sliding column, and the oil draining channel is aligned with the oil draining groove in the vertical direction; An oil replenishing tank, which is arranged above the switch mechanism, is fixedly connected to the transformer and is used to replenish oil, and is connected to the oil replenishing channel; An oil collecting mechanism, which is arranged outside the switch mechanism and is used to collect oil, and is connected to the oil drain tank; An oil pump, which is disposed between the oil replenishing tank and the oil collecting mechanism and is used for recycling the oil, and the oil replenishing tank and the oil collecting mechanism are both connected to the oil pump; Among them, after the oil level drops, it drives the sliding column downward, so that the first limit block cooperates with the limit groove to limit the shell body, and the oil replenishing tank adds oil into the shell body through the oil replenishing channel. After the oil level rises, it drives the sliding column upward, so that the second limit block cooperates with the limit groove to limit the shell body, and the excess oil overflows to the oil drain tank through the oil drain channel and is collected by the oil collecting mechanism. After the oil pump works, the oil in the oil collecting mechanism is extracted into the oil replenishing tank.

[0006] As a preferred solution of the on-load tap-changing switch and transformer with a safe operating mechanism described in the present invention, a first oil inlet is provided at the upper end of the oil replenishing channel, a first oil outlet is provided at the lower end of the oil replenishing channel, and the outer side of the first oil outlet is fitted with the inner side of the sleeve.

[0007] As a preferred solution of an on-load tap-changing switch and transformer with a safety operating mechanism described in the present invention, the distance between the limit groove and the lower end of the sleeve along the vertical direction is equal to the distance between the first limit block and the first oil outlet along the vertical direction. When the first limit block cooperates with the limit groove, the first oil outlet extends out of the lower end of the sleeve and is connected to the interior of the shell.

[0008] As a preferred solution of the on-load tap-changing switch and transformer with a safe operating mechanism described in the present invention, a second oil outlet is provided at the upper end of the oil discharge channel, a second oil inlet is provided at the lower end of the oil discharge channel, the outer side of the second oil outlet is fitted with the inner side of the sleeve, a through hole is opened inside the float, and the through hole is aligned with the second oil inlet.

[0009] As a preferred solution of an on-load tap-changing switch and transformer with a safety operating mechanism described in the present invention, the vertical spacing between the limit groove and the upper end of the oil drain groove is equal to the vertical spacing between the second limit block and the second oil outlet; when the second limit block cooperates with the limit groove, the second oil outlet extends out of the upper end of the shell and is connected to the oil drain groove.

[0010] As a preferred solution of the on-load tap-changing switch and transformer with a safe operating mechanism described in the present invention, a third oil outlet is provided at the bottom of the oil replenishing tank, and the third oil outlet is connected to the first oil inlet; a third oil inlet is provided at the top of the oil replenishing tank, and the third oil inlet is connected to the output end of the oil pump.

[0011] As a preferred solution of the on-load tap-changing switch and transformer with a safe operating mechanism described in the present invention, a hose is fixedly connected between the third oil outlet and the first oil inlet, and the hose is made of elastic material.

[0012] As a preferred solution of the on-load tap-changing switch and transformer with a safety operating mechanism described in the present invention, the oil collecting mechanism comprises a box body fixedly connected to the transformer, a fourth oil inlet is provided at one end of the box body close to the oil drain groove, a connecting pipe is connected between the fourth oil inlet and the oil drain groove, a fourth oil outlet is provided at one end of the box body close to the oil pump, and the fourth oil outlet is communicated with the input end of the oil pump.

[0013] As a preferred solution of the on-load tap-changing switch and transformer with a safe operating mechanism described in the present invention, a filter plate is provided inside the box, the filter plate is located between the fourth oil inlet and the fourth oil outlet, and both ends of the filter plate are slidably connected to the inner wall of the box.

[0014] As a preferred solution of the on-load tap-changing switch and transformer with a safety operating mechanism described in the present invention, a first oil drain valve is provided on one side of the filter plate close to the fourth oil inlet, a second oil drain valve is provided on one side of the filter plate close to the fourth oil outlet, the first oil drain valve and the second oil drain valve are both fixedly connected to the outer wall of the box, and the first oil drain valve and the second oil drain valve are both connected to the interior of the box.

[0015] The technical effects achieved by the present invention are: The present invention adopts the design of a limit mechanism, which can hinder the tap switching of the switch mechanism as the oil level rises and falls. When the amount of oil decreases or increases, the oil level drops or rises, and the oil drives the sliding column to move downward or upward through the floating block, so that the first limit block or the second limit block cooperates with the limit groove to limit the switch rotor, hindering the rotation of the switch rotor, thereby hindering the switch mechanism from performing tap switching, avoiding the situation where the arc cannot be extinguished in time when the amount of oil is too little or too much during the tap switching operation of the switch mechanism, thereby improving the safety during the tap switching operation; The present invention adopts the design of a limit mechanism and an oil replenishing tank. The oil replenishing tank can replenish oil to the switch mechanism as the sliding column moves downward. When the amount of oil in the housing is reduced too much, the liquid level of the oil drops and drives the sliding column to move downward, so that the oil replenishing channel connects the oil replenishing tank and the inside of the housing, and the oil in the oil replenishing tank moves into the housing, so that the oil is automatically replenished when the amount of oil in the housing is reduced too much, reducing the need for manual replenishment in the traditional method and improving convenience. The present invention adopts the design of a limiting mechanism and an oil collecting mechanism. The oil collecting mechanism can collect excess oil overflowing from the switch mechanism as the sliding column moves upward. The amount of oil in the shell expands due to heat and the liquid level rises. The oil drives the sliding column to move upward, so that the oil discharge channel connects the oil collecting mechanism and the interior of the shell. The oil in the shell overflows into the oil collecting mechanism for collection, thereby reducing leakage caused by the expansion of the oil after a large temperature change when there is too much oil, thereby improving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the structure of the switch mechanism and the limit mechanism in the present invention; Figure 3 The present invention Figure 2 The enlarged schematic diagram of point A in the middle; Figure 4 It is a cross-sectional schematic diagram of the switch mechanism and the limit mechanism in the present invention; Figure 5 is a cross-sectional schematic diagram of the oil replenishment channel and the switch mechanism in the present invention; Figure 6 is a cross-sectional schematic diagram of the oil discharge channel and the switch mechanism in the present invention; Figure 7 It is a schematic diagram of the structure of the sliding column in the present invention; Figure 8 is a cross-sectional schematic diagram of the oil replenishment channel in the present invention; Fig. 9 is a cross-sectional schematic diagram of the oil discharge channel in the present invention; Fig.10 It is a structural schematic diagram of the oil replenishing tank and the oil collecting mechanism in the present invention; Fig.11 It is a cross-sectional schematic diagram of the oil collecting mechanism in the present invention.

[0017] In the accompanying drawings, the components represented by the reference numerals are listed as follows: 10. Transformer; 20. switch mechanism; 21. housing; 211. oil drain groove; 22. switch rotor; 23. motor; 24. limit plate; 241. limit groove; 25. oil; 30. Limiting mechanism; 31. Sliding column; 311. Opening groove; 312. First limiting block; 313. Second limiting block; 314. Oil replenishing channel; 315. Oil drain channel; 316. First oil inlet; 317. First oil outlet; 318. Second oil outlet; 319. Second oil inlet; 32. Sleeve; 33. Floating block; 331. Through hole; 40. Oil replenishing tank; 41. Third oil outlet; 42. Third oil inlet; 43. Hose; 50. Oil collecting mechanism; 51. Box body; 511. Fourth oil inlet; 512. Fourth oil outlet; 513. Connecting pipe; 52. Filter plate; 53. First oil drain valve; 54. Second oil drain valve; 60. Oil pump. DETAILED DESCRIPTION

[0018] In order to make the purpose and advantages of the present invention more clearly understood, the present invention is specifically described below in conjunction with embodiments. It should be understood that the following text is only used to describe one or several specific embodiments of the present invention, and does not strictly limit the scope of protection of the specific claims of the present invention. Example 1

[0019] like Figures 1 to 10FIG. 1 is a first embodiment of the present invention, which provides an on-load tap-changing switch and a transformer with a safety operating mechanism, including a transformer 10; a switch mechanism 20, which is arranged at one end of the transformer 10, and includes a housing 21 fixedly connected to the transformer 10, wherein a switch rotor 22 is rotatably connected inside the housing 21, and a motor 23 is arranged above the switch rotor 22, wherein the motor 23 is fixedly connected to the transformer 10, and an output end of the motor 23 is fixedly connected to the switch rotor 22, and the switch rotor 22 A limit plate 24 is fixedly connected to one end near the motor 23, and a plurality of limit grooves 241 are opened on the outer side of the limit plate 24 along the circumferential direction. Oil 25 is provided inside the shell 21, and an oil drain groove 211 is opened on the outer side of the shell 21; a limit mechanism 30 is arranged at the top of the shell 21 to prevent the switch mechanism 20 from switching. The limit mechanism 30 includes a slide column 31 slidably connected to the shell 21, and a sleeve 32 is provided on the outside of the slide column 31. The slide column 31 and the sleeve 32 are slidably matched in the vertical direction, and the sleeve 32 is connected to the shell 21. 1 is fixedly connected, a floating block 33 is fixedly connected to the lower end of the sliding column 31, an open groove 311 is opened on the side of the sliding column 31 close to the limit plate 24, a first limit block 312 is fixedly connected to the upper end of the open groove 311, and a second limit block 313 is fixedly connected to the lower end of the open groove 311, the first limit block 312 and the second limit block 313 are both slidably matched with the limit groove 241 in the vertical direction, an oil replenishing channel 314 and an oil draining channel 315 are opened inside the sliding column 31, and the oil draining channel 315 is aligned with the oil draining groove 211 in the vertical direction; An oil replenishing tank 40 is arranged above the switch mechanism 20, the oil replenishing tank 40 is fixedly connected to the transformer 10, and is used to replenish the oil 25. The oil replenishing tank 40 is communicated with the oil replenishing channel 314; an oil collecting mechanism 50, the oil collecting mechanism 50 is arranged on the outer side of the switch mechanism 20, and is used to collect the oil 25. The oil collecting mechanism 50 is communicated with the oil drain groove 211; an oil pump 60, the oil pump 60 is arranged between the oil replenishing tank 40 and the oil collecting mechanism 50, and is used to recycle the oil 25. The oil replenishing tank 40 and the oil collecting mechanism 50 are both communicated with the oil pump 60.

[0020] It should be noted that the density of the float 33 is smaller than the density of the oil 25 .

[0021] When the present invention is in use, the oil 25 in the housing 21 decreases and drives the floating block 33 to move downward, and the floating block 33 drives the sliding column 31 to move downward. When the oil 25 decreases too much, the sliding column 31 drives the first limit block 312 to insert into the limit groove 241, and limits the limit plate 24 to prevent the switch rotor 22 from rotating, so as to prevent the switch mechanism 20 from switching when the amount of oil 25 is too small. When the amount of oil 25 in the housing 21 increases, the liquid level of the oil 25 rises and drives the floating block 33 to move upward. The floating block 33 drives the slide post 31 to move upward. When the liquid level of the oil 25 rises too much, the slide post 31 drives the second limit block 313 to insert into the limit groove 241 to limit the limit plate 24, thereby preventing the switch rotor 22 from rotating. This is convenient for preventing the switch mechanism 20 from performing tap switching when the liquid level of the oil 25 rises too much, thereby avoiding the situation where the arc cannot be extinguished in time when the switch mechanism 20 is operated on tap when the amount of the oil 25 is too little or too much, thereby improving the safety during the tap switching operation. In the process of the oil 25 level dropping and driving the slide column 31 to move downward, when the oil 25 level drops too much, the slide column 31 drives the oil replenishment channel 314 to move downward so that the oil replenishment channel 314 is connected with the inside of the oil replenishment tank 40 and the housing 21, and the oil 25 in the oil replenishment tank 40 moves into the housing 21, so that the oil 25 is automatically replenished when the amount of the oil 25 in the housing 21 is reduced too much, thereby reducing the need for manual replenishment in the traditional method and improving convenience; In the process of the oil 25 liquid level rising and driving the slide column 31 to move upward, when the oil 25 liquid level rises too much, the slide column 31 drives the oil discharge channel 315 to move upward so that the oil discharge channel 315 is connected with the oil collecting mechanism 50 and the inside of the housing 21, and the oil 25 in the housing 21 overflows into the oil collecting mechanism 50 for collection, thereby reducing the leakage caused by the expansion of the oil 25 after a large temperature change when there is too much oil 25, thereby improving safety; After the oil pump 60 starts working, it extracts the oil 25 in the oil collecting mechanism 50 and moves it to the oil replenishing tank 40, so that the oil replenishing tank 40 can replenish the oil 25 to the switch mechanism 20, so that the oil 25 can be recycled and the convenience is improved. Example 2

[0022] Reference Figures 1 to 11 , which is the second embodiment of the present invention, and this embodiment is based on the previous embodiment.

[0023] like Figure 5 and Figure 8 As shown, a first oil inlet 316 is disposed at the upper end of the oil replenishing channel 314 , and a first oil outlet 317 is disposed at the lower end of the oil replenishing channel 314 . The outer side of the first oil outlet 317 fits closely with the inner side of the sleeve 32 .

[0024] It should be noted that when the first limiting block 312 is not inserted into the limiting groove 241 , the outer side of the first oil outlet 317 fits with the inner side of the sleeve 32 .

[0025] According to the above structure, the sleeve 32 fits with the first oil outlet 317, so as to prevent the oil replenishing channel 314 from connecting the oil replenishing tank 40 with the interior of the shell 21 when the liquid level of the oil 25 is not too low, thereby preventing the oil replenishing tank 40 from replenishing the oil 25 to the switch mechanism 20 in this state.

[0026] like Figure 5 and Figure 8 As shown, the vertical spacing between the limit groove 241 and the lower end of the sleeve 32 is equal to the vertical spacing between the first limit block 312 and the first oil outlet 317. When the first limit block 312 cooperates with the limit groove 241, the first oil outlet 317 extends out of the lower end of the sleeve 32 and communicates with the interior of the shell 21.

[0027] According to the above structure, when the liquid level of the oil 25 drops too low, the oil 25 drives the sliding column 31 to move downward, so that the first limit block 312 is inserted into the limit groove 241. At this time, the sleeve 32 is no longer in contact with the first oil outlet 317, and the first oil outlet 317 is connected to the interior of the shell 21, so that when the liquid level of the oil 25 is too low, the oil replenishing channel 314 connects the oil replenishing tank 40 with the interior of the shell 21, so that the oil replenishing tank 40 can replenish the oil 25 to the switch mechanism 20 in this state.

[0028] like Figure 6 and Fig. 9 As shown, a second oil outlet 318 is provided at the upper end of the oil discharge channel 315, and a second oil inlet 319 is provided at the lower end of the oil discharge channel 315. The outer side of the second oil outlet 318 fits closely with the inner side of the sleeve 32, and a through hole 331 is provided inside the float 33, which is aligned with the second oil inlet 319.

[0029] It should be noted that when the second limiting block 313 is not inserted into the limiting groove 241 , the outer side of the second oil outlet 318 fits with the inner side of the sleeve 32 .

[0030] According to the above structure, the sleeve 32 fits with the second oil outlet 318, so as to prevent the oil discharge channel 315 from connecting the oil collecting mechanism 50 and the interior of the shell 21 when the liquid level of the oil 25 is not too high, thereby preventing the oil 25 from overflowing into the oil collecting mechanism 50 in this state.

[0031] like Figure 6 and Fig. 9As shown, the vertical distance between the limit groove 241 and the upper end of the oil drain groove 211 is equal to the vertical distance between the second limit block 313 and the second oil outlet 318. When the second limit block 313 cooperates with the limit groove 241, the second oil outlet 318 extends out of the upper end of the shell 21 and communicates with the oil drain groove 211.

[0032] It should be noted that the bottom of the oil drain groove 211 is an inclined surface, and the inclined surface is inclined outward.

[0033] According to the above structure, when the liquid level of the oil 25 rises too high, the oil 25 drives the sliding column 31 to move upward, so that the second limit block 313 is inserted into the limit groove 241. At this time, the sleeve 32 is no longer in contact with the second oil outlet 318. The second oil outlet 318 rises to the same height as the oil drain groove 211 and is aligned with the oil drain groove 211, so that the oil collecting mechanism 50 is connected to the interior of the shell 21 through the oil drain channel 315, so that when the liquid level of the oil 25 is too high, the oil 25 in the shell 21 overflows into the oil collecting mechanism 50 for collection.

[0034] like Fig.10 As shown, a third oil outlet 41 is formed at the bottom of the oil replenishing tank 40 , and the third oil outlet 41 is connected to the first oil inlet 316 . A third oil inlet 42 is formed at the top of the oil replenishing tank 40 , and the third oil inlet 42 is connected to the output end of the oil pump 60 .

[0035] According to the above structure, after the oil pump 60 works, it extracts the oil 25 in the oil collecting mechanism 50, so that the oil 25 moves to the oil replenishing tank 40 through the third oil inlet 42, and the oil 25 moves to the housing 21 through the third oil outlet 41, which is convenient for the recycling of the oil 25.

[0036] like Fig.10 As shown, a hose 43 is fixedly connected between the third oil outlet 41 and the first oil inlet 316 , and the hose 43 is made of elastic material.

[0037] According to the above structure, the hose 43 is elastic, so as to maintain the stability of the connection between the third oil outlet 41 and the first oil inlet 316 during the upward and downward movement of the sliding column 31 .

[0038] like Figure 2 , Figure 3 , Fig.10 and Fig.11 As shown, the oil collecting mechanism 50 includes a box body 51 fixedly connected to the transformer 10, a fourth oil inlet 511 is provided at one end of the box body 51 close to the oil drain groove 211, a connecting pipe 513 is connected between the fourth oil inlet 511 and the oil drain groove 211, and a fourth oil outlet 512 is provided at one end of the box body 51 close to the oil pump 60, and the fourth oil outlet 512 is connected to the input end of the oil pump 60.

[0039] According to the above structure, the oil 25 overflowing from the oil drain groove 211 moves to the interior of the box body 51 through the connecting pipe 513 and the fourth oil inlet 511, so that the oil collecting mechanism 50 can collect the oil 25. After the oil pump 60 works, it extracts the oil 25 collected in the box body 51 through the fourth oil outlet 512, and moves the oil 25 to the oil replenishing tank 40, so as to facilitate the recycling of the oil 25.

[0040] like Fig.11 As shown, a filter plate 52 is provided inside the box body 51 , and the filter plate 52 is located between the fourth oil inlet 511 and the fourth oil outlet 512 . Both ends of the filter plate 52 are slidably connected to the inner wall of the box body 51 .

[0041] According to the above structure, after the oil pump 60 works, it extracts the oil 25 collected in the box body 51, so that the oil 25 moves from one side of the filter plate 52 to the other side, so that the filter plate 52 filters the oil 25, thereby improving the quality of the oil 25 extracted into the oil replenishing tank 40 and facilitating the recycling of the oil 25.

[0042] like Fig.11 As shown, a first oil drain valve 53 is provided on one side of the filter plate 52 close to the fourth oil inlet 511, and a second oil drain valve 54 is provided on one side of the filter plate 52 close to the fourth oil outlet 512. Both the first oil drain valve 53 and the second oil drain valve 54 are fixedly connected to the outer wall of the box body 51, and both the first oil drain valve 53 and the second oil drain valve 54 are communicated with the interior of the box body 51.

[0043] It should be noted that the first oil drain valve 53 and the second oil drain valve 54 are both existing technologies, and the first oil drain valve 53 and the second oil drain valve 54 are both manual switch valves or electric switch valves.

[0044] According to the above structure, after opening the first oil drain valve 53, the unfiltered oil 25 collected in the box body 51 is discharged, which is convenient for subsequent quality analysis of the oil 25. If the quality drops too low, the oil 25 in the shell body 21 needs to be replaced. After opening the second oil drain valve 54, the oil 25 filtered by the filter plate 52 is discharged, which is convenient for subsequent comparison and analysis of the oil 25 and the unfiltered oil 25 discharged from the first oil drain valve 53. If the quality difference between the oil 25 at the first oil drain valve 53 and the second oil drain valve 54 is too small, it means that the filtering effect of the filter plate 52 is insufficient and the filter plate 52 needs to be replaced.

[0045] The working principle of the present invention is as follows: the motor 23 drives the switch rotor 22 to rotate to perform the tap switching operation. When the amount of oil 25 is too little or too much, the liquid level height of the oil 25 is also different. The oil 25 drives the sliding column 31 to move up and down, so that the first limit block 312 or the second limit block 313 cooperates with the limit groove 241 to hinder the rotation of the switch rotor 22, thereby improving the safety during the tap switching operation. In the process of the oil 25 driving the sliding column 31 to move up and down, when the liquid level of the oil 25 is too low, the oil replenishment channel 314 connects the oil replenishment tank 40 and the inside of the shell 21, and the oil replenishment tank 40 replenishes the switch mechanism 20 with oil 25 to improve convenience. When the liquid level of the oil 25 is too high after expanding due to temperature changes, the oil discharge channel 315 connects the oil collecting mechanism 50 and the inside of the shell 21, and the excess oil 25 overflows into the oil collecting mechanism 50 for collection, thereby reducing leakage and improving safety.

[0046] The above is only a preferred embodiment of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principles of the present invention, and these improvements and modifications should also be considered as the protection scope of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention shall be implemented according to the conventional means in the art unless otherwise specified and limited.

Claims

1. An on-load tap-changing switch and transformer with a safe operating mechanism, characterized in that: include: Transformer (10); A switch mechanism (20), the switch mechanism (20) being arranged at one end of the transformer (10), the switch mechanism (20) comprising a housing (21) fixedly connected to the transformer (10), a switch rotor (22) being rotatably connected inside the housing (21), a motor (23) being arranged above the switch rotor (22), the motor (23) being fixedly connected to the transformer (10), an output end of the motor (23) being fixedly connected to the switch rotor (22), an end of the switch rotor (22) close to the motor (23) being fixedly connected to a limit plate (24), a plurality of limit grooves (241) being provided on the outer side of the limit plate (24) along the circumferential direction, oil (25) being provided inside the housing (21), and an oil drain groove (211) being provided on the outer side of the housing (21); A limiting mechanism (30) is arranged at the top of the housing (21) and is used to prevent the switch mechanism (20) from switching. The limiting mechanism (30) comprises a sliding column (31) slidably connected to the housing (21). A sleeve (32) is provided on the outside of the sliding column (31). The sliding column (31) and the sleeve (32) are slidably matched in a vertical direction. The sleeve (32) is fixedly connected to the housing (21). A floating block (33) is fixedly connected to the lower end of the sliding column (31). The sliding column (31) is close to the limiting plate ( An open groove (311) is provided on one side of the sliding column (31), a first limit block (312) is fixedly connected to the upper end of the open groove (311), a second limit block (313) is fixedly connected to the lower end of the open groove (311), the first limit block (312) and the second limit block (313) are both slidably matched with the limit groove (241) in the vertical direction, an oil replenishment channel (314) and an oil discharge channel (315) are provided inside the sliding column (31), and the oil discharge channel (315) is aligned with the oil discharge groove (211) in the vertical direction; an oil replenishing tank (40), the oil replenishing tank (40) being arranged above the switch mechanism (20), the oil replenishing tank (40) being fixedly connected to the transformer (10) and being used to replenish oil (25), the oil replenishing tank (40) being in communication with the oil replenishing channel (314); An oil collecting mechanism (50), the oil collecting mechanism (50) being arranged outside the switch mechanism (20) and being used to collect oil (25), the oil collecting mechanism (50) being in communication with the oil drain groove (211); an oil pump (60), the oil pump (60) being arranged between the oil replenishing tank (40) and the oil collecting mechanism (50) and being used for circulating the oil (25); the oil replenishing tank (40) and the oil collecting mechanism (50) being both connected to the oil pump (60); The oil (25) level drops and drives the sliding column (31) to move downward, so that the first limit block (312) cooperates with the limit groove (241) to limit the housing (21), and the oil replenishing tank (40) adds oil (25) into the housing (21) through the oil replenishing channel (314). The oil (25) level rises and drives the sliding column (31) to move upward, so that the second limit block (313) cooperates with the limit groove (241) to limit the housing (21), and the excess oil (25) overflows into the oil drain groove (211) through the oil drain channel (315) and is collected by the oil collecting mechanism (50). After the oil pump (60) is in operation, the oil (25) in the oil collecting mechanism (50) is extracted into the oil replenishing tank (40).

2. The on-load tap-changing switch and transformer with a safety operating mechanism according to claim 1, characterized in that: The upper end of the oil replenishment channel (314) is provided with a first oil inlet (316), and the lower end of the oil replenishment channel (314) is provided with a first oil outlet (317), and the outer side of the first oil outlet (317) fits closely with the inner side of the sleeve (32).

3. The on-load tap-changing switch and transformer with a safe operating mechanism according to claim 2, characterized in that: The vertical distance between the limiting groove (241) and the lower end of the sleeve (32) is equal to the vertical distance between the first limiting block (312) and the first oil outlet (317); when the first limiting block (312) is matched with the limiting groove (241), the first oil outlet (317) extends out of the lower end of the sleeve (32) and communicates with the interior of the housing (21).

4. The on-load tap-changing switch and transformer with a safe operating mechanism according to claim 3, characterized in that: A second oil outlet (318) is provided at the upper end of the oil discharge channel (315), and a second oil inlet (319) is provided at the lower end of the oil discharge channel (315). The outer side of the second oil outlet (318) fits closely with the inner side of the sleeve (32). A through hole (331) is provided inside the floating block (33), and the through hole (331) is aligned with the second oil inlet (319).

5. The on-load tap-changing switch and transformer with a safe operating mechanism according to claim 4, characterized in that: The vertical distance between the limit groove (241) and the upper end of the oil drain groove (211) is equal to the vertical distance between the second limit block (313) and the second oil outlet (318); when the second limit block (313) is matched with the limit groove (241), the second oil outlet (318) extends out of the upper end of the housing (21) and communicates with the oil drain groove (211).

6. The on-load tap-changing switch and transformer with a safety operating mechanism according to claim 5, characterized in that: A third oil outlet (41) is provided at the bottom of the oil replenishment tank (40), and the third oil outlet (41) is connected to the first oil inlet (316). A third oil inlet (42) is provided at the top of the oil replenishment tank (40), and the third oil inlet (42) is connected to the output end of the oil pump (60).

7. The on-load tap-changing switch and transformer with a safe operating mechanism according to claim 6, characterized in that: A hose (43) is fixedly connected between the third oil outlet (41) and the first oil inlet (316), and the hose (43) is made of elastic material.

8. The on-load tap-changing switch and transformer with a safe operating mechanism according to claim 1, characterized in that: The oil collecting mechanism (50) comprises a box body (51) fixedly connected to the transformer (10); a fourth oil inlet (511) is provided at one end of the box body (51) close to the oil drain groove (211); a connecting pipe (513) is connected between the fourth oil inlet (511) and the oil drain groove (211); a fourth oil outlet (512) is provided at one end of the box body (51) close to the oil pump (60); the fourth oil outlet (512) is connected to the input end of the oil pump (60).

9. The on-load tap-changing switch and transformer with a safety operating mechanism according to claim 8, characterized in that: A filter plate (52) is provided inside the box body (51), and the filter plate (52) is located between the fourth oil inlet (511) and the fourth oil outlet (512), and both ends of the filter plate (52) are slidably connected to the inner wall of the box body (51).

10. The on-load tap-changing switch and transformer with a safety operating mechanism according to claim 9, characterized in that: A first oil drain valve (53) is provided on one side of the filter plate (52) close to the fourth oil inlet (511), and a second oil drain valve (54) is provided on one side of the filter plate (52) close to the fourth oil outlet (512). The first oil drain valve (53) and the second oil drain valve (54) are both fixedly connected to the outer wall of the box body (51), and the first oil drain valve (53) and the second oil drain valve (54) are both in communication with the interior of the box body (51).

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