On-load tap-changing switch and transformer with safety operating mechanism

Abstract

The present invention belongs to the technical field of transformer voltage regulating switches, and specifically relates to an on-load voltage regulating switch and transformer with a safety operating mechanism, comprising a transformer; a switch mechanism; a limiting mechanism, the limiting mechanism being arranged at the top of a housing and being used to prevent the switch mechanism from switching; an oil replenishing tank, the oil replenishing tank being fixedly connected to the transformer and being used to replenish oil, the oil replenishing tank being connected to an oil replenishing channel; an oil collecting mechanism being used to collect oil, the oil collecting mechanism being connected to an oil drain tank; and an oil pump being used to recycle oil, the oil replenishing tank and the oil collecting mechanism being both connected to the oil pump. The present invention can prevent the switch mechanism from switching by tapping by virtue of the limiting mechanism rising and falling with the oil level, thereby improving the safety during the tap switching operation. The oil replenishing tank can replenish oil to 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.

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 safety operating mechanism. Background Art

[0002] An on-load tap changer (OLT) adjusts voltage by changing the connection of the transformer windings without interrupting the power supply, thereby maintaining grid voltage stability. This type of switch can operate while the transformer is operating, meaning it switches taps under load, hence the term "on-load." An OLT primarily consists of a rotor and a housing. During voltage regulation, the rotor rotates within the housing, seamlessly switching from one tap to another, thereby adjusting the transformer's output voltage. Because the arc generated during tap switching is hot and can easily cause equipment failure, the rotor is typically immersed in oil to extinguish the arc.

[0003] During use, existing on-load tap-changing switches and transformers generally do not have a safety 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 prevent the arc from being extinguished in time, this leads to insufficient safety during tap switching operations. In addition, when the oil is too little, there is no automatic oil replenishment mechanism, and manual oil replenishment is required, which is not convenient enough. When there is too much oil, it is easy to increase the risk of leakage due to the expansion of the oil after a large temperature change, resulting in insufficient safety. Summary of the Invention

[0004] The purpose of the present invention is to provide an on-load tap-changing switch and transformer with a safe operating mechanism, which can improve the safety during the tap switching operation by hindering the tap switching of the switch mechanism through a limit mechanism as the oil level rises and falls, and 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 solutions adopted by the present invention are as follows:

[0006] An on-load tap-changing switch and a transformer with a safety operating mechanism, comprising:

[0007] transformer;

[0008] A switch mechanism is provided at one end of the transformer, comprising a housing fixedly connected to the transformer, a switch rotor rotatably connected to the interior of the housing, a motor disposed above the switch rotor, the motor fixedly connected to the transformer, the output end of the motor fixedly connected to the switch rotor, a limit plate fixedly connected to one end of the switch rotor proximate the motor, a plurality of limit grooves circumferentially defined on the outer side of the limit plate, oil provided inside the housing, and an oil drain groove defined on the outer side of the housing;

[0009] The limit mechanism is arranged on the top of the shell and is used to prevent the switch mechanism from switching, the limit mechanism includes a slide column slidably connected to the shell, a sleeve is provided on the outside of the slide column, the slide column and the sleeve are slidably matched in the vertical direction, the sleeve is fixedly connected to the shell, the lower end of the slide column is fixedly connected to a floating block, the slide column is provided with an open groove on one side close to the limit plate, the upper end of the open groove is fixedly connected to a first limit block, the lower end of the open groove is fixedly connected to 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, the slide column is provided with an oil replenishment channel and an oil discharge channel, and the oil discharge channel is aligned with the oil discharge groove in the vertical direction;

[0010] An oil replenishing tank is provided above the switch mechanism, is fixedly connected to the transformer, is used to replenish oil, and is communicated with the oil replenishing channel;

[0011] 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;

[0012] An oil pump is provided between the oil supply tank and the oil collecting mechanism for recycling the oil, and both the oil supply tank and the oil collecting mechanism are connected to the oil pump;

[0013] Among them, after the oil level drops, it drives the sliding column to move downward, so that the first limit block cooperates with the limit groove to limit the housing, and the oil replenishing tank adds oil to the housing through the oil replenishing channel. After the oil level rises, it drives the sliding column to move upward, so that the second limit block cooperates with the limit groove to limit the housing, and the excess oil overflows into 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.

[0014] As a preferred solution of the on-load tap-changer and transformer with a safety operating mechanism described in the present invention, a first oil inlet is provided at the upper end of the oil supply channel, a first oil outlet is provided at the lower end of the oil supply channel, and the outer side of the first oil outlet is fitted with the inner side of the sleeve.

[0015] As a preferred solution of the on-load tap-changing switch and transformer with a safety operating mechanism described in the present invention, the vertical distance between the limit groove and the lower end of the sleeve is equal to the vertical distance between the first limit block and the first oil outlet; when the first limit block cooperates with the limit groove, the first oil outlet extends out of the lower end of the sleeve and communicates with the interior of the shell.

[0016] As a preferred solution of the on-load tap-changing switch and transformer with a safety 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.

[0017] As a preferred solution of the on-load tap-changing switch and transformer with a safety operating mechanism described in the present invention, the vertical distance between the limit groove and the upper end of the oil drain groove is equal to the vertical distance 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 communicates with the oil drain groove.

[0018] As a preferred embodiment of the on-load tap-changer and transformer with a safety operating mechanism described in the present invention, a third oil outlet is provided at the bottom of the oil replenishing tank, the third oil outlet is connected to the first oil inlet, and a third oil inlet is provided at the top of the oil replenishing tank, the third oil inlet is connected to the output end of the oil pump.

[0019] As a preferred solution of the on-load tap-changer and transformer with a safety 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.

[0020] 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 includes a box fixedly connected to the transformer, a fourth oil inlet is provided at one end of the box close to the oil drain groove, a connecting pipe is connected between the fourth oil inlet and the oil drain groove, and a fourth oil outlet is provided at one end of the box close to the oil pump, and the fourth oil outlet is connected to the input end of the oil pump.

[0021] As a preferred solution of the on-load tap-changing switch and transformer with a safety 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.

[0022] As a preferred embodiment of the on-load tap changer and transformer with a safety operating mechanism described in the present invention, a first oil drain valve is provided on a side of the filter plate close to the fourth oil inlet, and a second oil drain valve is provided on a 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 are both connected to the interior of the box.

[0023] The technical effects achieved by the present invention are:

[0024] The present invention adopts a limit mechanism design that can hinder the tap switching of the switch mechanism as the oil level rises or falls. When the amount of oil decreases or increases, the oil level drops or rises, and the oil drives the slide column downward or upward through the float 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 tap switching of the switch mechanism. This avoids the situation where the tap switching operation of the switch mechanism is performed when the amount of oil is too little or too much, resulting in the arc not being extinguished in time, thereby improving the safety during the tap switching operation.

[0025] 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 decreases too much, the oil level drops and drives the sliding column downward, so that the oil replenishing channel connects the oil replenishing tank and the interior of the housing. 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 decreases too much, reducing the need for manual replenishment in traditional methods and improving convenience.

[0026] 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 housing 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 housing. The oil in the housing 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

[0027] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 It is a structural diagram of the switch mechanism and the limit mechanism in the present invention;

[0029] Figure 3 In the present invention Figure 2 A magnified schematic diagram of point A in the middle;

[0030] Figure 4 It is a cross-sectional schematic diagram of the switch mechanism and the limit mechanism in the present invention;

[0031] Figure 5 is a cross-sectional schematic diagram of the oil replenishment channel and the switch mechanism in the present invention;

[0032] Figure 6 is a cross-sectional schematic diagram of the oil discharge channel and the switch mechanism in the present invention;

[0033] Figure 7 It is a structural schematic diagram of the sliding column in the present invention;

[0034] Figure 8 is a schematic cross-sectional view of the oil replenishment channel in the present invention;

[0035] Figure 9 is a schematic cross-sectional view of the oil discharge channel in the present invention;

[0036] Figure 10 It is a structural schematic diagram of the oil replenishing tank and the oil collecting mechanism in the present invention;

[0037] Figure 11 It is a cross-sectional schematic diagram of the oil collecting mechanism of the present invention.

[0038] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0039] 10. Transformer;

[0040] 20. Switch mechanism; 21. Housing; 211. Oil drain tank; 22. Switch rotor; 23. Motor; 24. Limit plate; 241. Limit slot; 25. Oil;

[0041] 30. Limiting mechanism; 31. Sliding column; 311. Opening groove; 312. First limiting block; 313. Second limiting block; 314. Oil supply channel; 315. Oil discharge 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;

[0042] 40. Oil replenishment tank; 41. Third oil outlet; 42. Third oil inlet; 43. Hose;

[0043] 50. Oil collecting mechanism; 51. Box; 511. Fourth oil inlet; 512. Fourth oil outlet; 513. Connecting pipe; 52. Filter plate; 53. First oil drain valve; 54. Second oil drain valve;

[0044] 60. Oil pump. DETAILED DESCRIPTION

[0045] In order to make the purpose and advantages of the present invention more clearly understood, the present invention is described in detail below with reference to the following examples. It should be understood that the following text is only used to describe one or more specific embodiments of the present invention and does not strictly limit the scope of protection of the present invention. Example 1

[0046] like Figures 1 to 10 FIG. 1 is a first embodiment of the present invention, which provides an on-load tap changer 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, a switch rotor 22 rotatably connected to the interior of the housing 21, and a motor 23 is provided above the switch rotor 22, the motor 23 is fixedly connected to the transformer 10, and the output end of the motor 23 is fixedly connected to the switch rotor 22. One end close to the motor 23 is fixedly connected to a limit plate 24, and a plurality of limit grooves 241 are opened on the outer side of the limit plate 24 along the circumferential direction. The interior of the housing 21 is provided with oil 25, and the outer side of the housing 21 is provided with an oil drain groove 211; a limit mechanism 30 is provided at the top of the housing 21 to prevent the switching of the switch mechanism 20. The limit mechanism 30 includes a slide 31 slidably connected to the housing 21, and a sleeve 32 is provided on the outside of the slide 31. The slide 31 and the sleeve 32 slide together in the vertical direction, and the sleeve 32 is in contact with the housing 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 formed 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 engaged with the limit groove 241 in the vertical direction. An oil replenishment channel 314 and an oil discharge channel 315 are formed inside the sliding column 31. The oil discharge channel 315 is aligned with the oil discharge groove 211 in the vertical direction. The 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 connected to the oil replenishing channel 314; the oil collecting mechanism 50 is arranged on the outside of the switch mechanism 20, and is used to collect the oil 25. The oil collecting mechanism 50 is connected to the oil drain groove 211; 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 connected to the oil pump 60.

[0047] It should be noted that the density of the float 33 is less than the density of the oil 25 .

[0048] When the present invention is in use, the oil 25 in the housing 21 decreases and drives the float 33 to move downward, and the float 33 drives the slide column 31 to move downward. When the oil 25 decreases too much, the slide column 31 drives the first limit block 312 to insert into the limit groove 241, limiting the limit plate 24 and hindering the rotation of the switch rotor 22, so as to prevent the switch mechanism 20 from performing tap switching when the amount of oil 25 is too little. When the amount of oil 25 in the housing 21 increases, the liquid level of the oil 25 rises and drives the float 33 to move upward. The float 33 drives the slide 31 upward. When the level of the oil 25 rises too much, the slide 31 drives the second limit block 313 to insert into the limit groove 241, limiting the limit plate 24 and hindering the rotation of the switch rotor 22. This prevents the switch mechanism 20 from performing tap switching when the level of the oil 25 rises too much. This prevents the switch mechanism 20 from performing tap switching when the amount of oil 25 is too little or too much, which may cause the arc to be unable to be extinguished in time, thereby improving the safety of the tap switching operation.

[0049] When the level of the oil 25 drops and the spool 31 moves downward, if the level of the oil 25 drops too much, the spool 31 drives the oil replenishment channel 314 downward, so that the oil replenishment channel 314 connects the oil replenishment tank 40 with the interior of the housing 21, and the oil 25 in the oil replenishment tank 40 moves into the housing 21. As a result, the oil 25 is automatically replenished when the amount of oil 25 in the housing 21 decreases too much, thereby reducing the need for manual replenishment in traditional methods and improving convenience.

[0050] When the level of the oil 25 rises and the slide 31 moves upward, if the level of the oil 25 rises too much, the slide 31 drives the oil discharge passage 315 upward, so that the oil discharge passage 315 connects the oil collecting mechanism 50 with the interior of the housing 21. The oil 25 in the housing 21 overflows into the oil collecting mechanism 50 for collection. This reduces leakage caused by expansion of the oil 25 when the oil 25 is excessive and undergoes significant temperature changes, thereby improving safety.

[0051] After the oil pump 60 works, it extracts the oil 25 from 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

[0052] Reference Figures 1 to 11 , which is the second embodiment of the present invention, and is based on the previous embodiment.

[0053] like Figure 5 and Figure 8 As shown, a first oil inlet 316 is provided at the upper end of the oil replenishing channel 314 , and a first oil outlet 317 is provided 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 .

[0054] 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 is in contact with the inner side of the sleeve 32 .

[0055] According to the above structure, the sleeve 32 fits with the first oil outlet 317, so that when the liquid level of the oil 25 is not too low, the oil replenishing channel 314 is blocked from connecting the oil replenishing tank 40 with the interior of the shell 21, thereby preventing the oil replenishing tank 40 from replenishing the oil 25 to the switch mechanism 20 in this state.

[0056] like Figure 5 and Figure 8 As shown, the vertical distance between the limit groove 241 and the lower end of the sleeve 32 is equal to the vertical distance 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.

[0057] 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.

[0058] like Figure 6 and Figure 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.

[0059] 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 is in contact with the inner side of the sleeve 32 .

[0060] According to the above structure, the sleeve 32 fits with the second oil outlet 318, so that when the liquid level of the oil 25 is not too high, the oil discharge channel 315 is blocked from connecting the oil collecting mechanism 50 and the interior of the shell 21, thereby preventing the oil 25 from overflowing into the oil collecting mechanism 50 in this state.

[0061] like Figure 6 and Figure 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 is connected to the oil drain groove 211.

[0062] It should be noted that the bottom of the oil drain groove 211 is an inclined surface, and the inclined surface is inclined outward.

[0063] 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. After the second oil outlet 318 rises to the same height as the oil drain groove 211, it 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.

[0064] like Figure 10 As shown, a third oil outlet 41 is provided at the bottom of the oil replenishing tank 40 , which is connected to the first oil inlet 316 ; a third oil inlet 42 is provided at the top of the oil replenishing tank 40 , which is connected to the output end of the oil pump 60 .

[0065] 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 facilitates the recycling of the oil 25.

[0066] like Figure 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.

[0067] According to the above structure, the provided hose 43 is elastic, which helps 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 .

[0068] like Figure 2 、 Figure 3 、 Figure 10 and Figure 11 As shown, the oil collecting mechanism 50 includes a box body 51 fixedly connected to the transformer 10, and a fourth oil inlet 511 is provided at one end of the box body 51 close to the oil drain groove 211, and 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.

[0069] 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.

[0070] like Figure 11 As shown, a filter plate 52 is provided inside the box body 51 . 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 .

[0071] 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.

[0072] like Figure 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. 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 communicated with the interior of the box body 51.

[0073] It should be noted that the first oil discharge valve 53 and the second oil discharge valve 54 are both existing technologies, and both the first oil discharge valve 53 and the second oil discharge valve 54 are manual switching valves or electric switching valves.

[0074] 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 housing 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 comparative 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.

[0075] 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 slide 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 slide 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 oil 25 to the switch mechanism 20 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.

[0076] The foregoing is merely a preferred embodiment of the present invention. It should be noted that those skilled in the art may make various improvements and modifications without departing from the principles of the present invention, and such improvements and modifications are also within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described or explained herein shall, unless otherwise specified or limited, be implemented in accordance with conventional means in the art.

Claims

1. An on-load tap-changer and transformer with a safety 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 provided at the top of the housing (21) and is used to prevent the switch mechanism (20) from switching. The limiting mechanism (30) includes 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 the 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 (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 provided 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), 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 for replenishing 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 supply tank (40) and the oil collecting mechanism (50) and being used for recycling the oil (25), the oil supply tank (40) and the oil collecting mechanism (50) both being in communication with the oil pump (60); wherein, after the level of the oil (25) drops, the sliding column (31) is driven to move downward, so that the first limiting block (312) cooperates with the limiting 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); and after the level of the oil (25) rises, the sliding column (31) is driven to move upward, so that the second limiting block (313) cooperates with the limiting groove (241) to limit the housing (21); and the excess oil (25) overflows into the oil draining groove (211) through the oil draining channel (315) and is collected by the oil collecting mechanism (50); and after the oil pump (60) works, the oil (25) in the oil collecting mechanism (50) is pumped into the oil replenishing tank (40); The upper end of the oil replenishing channel (314) is provided with a first oil inlet (316), and the lower end of the oil replenishing channel (314) is provided with a first oil outlet (317), and the outer side of the first oil outlet (317) is fitted with the inner side of the sleeve (32).

2. The on-load tap-changer and transformer with a safety operating mechanism according to claim 1, 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 engaged 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).

3. The on-load tap-changer and transformer with a safety operating mechanism according to claim 2, 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).

4. The on-load tap-changer and transformer with a safety operating mechanism according to claim 3, characterized in that: The vertical distance between the limiting groove (241) and the upper end of the oil drain groove (211) is equal to the vertical distance between the second limiting block (313) and the second oil outlet (318); when the second limiting block (313) is engaged with the limiting 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).

5. The on-load tap-changer and transformer with a safety operating mechanism according to claim 4, characterized in that: A third oil outlet (41) is provided 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 provided 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).

6. The on-load tap-changer and transformer with a safety operating mechanism according to claim 5, 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.

7. The on-load tap-changer and transformer with a safety operating mechanism according to claim 1, characterized in that: The oil collecting mechanism (50) comprises a box (51) fixedly connected to the transformer (10); a fourth oil inlet (511) is provided at one end of the box (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 (51) close to the oil pump (60); the fourth oil outlet (512) is communicated with an input end of the oil pump (60).

8. The on-load tap-changer and transformer with a safety operating mechanism according to claim 7, characterized in that: A filter plate (52) is provided inside the box (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 (51).

9. The on-load tap-changer and transformer with a safety operating mechanism according to claim 8, 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 communicated with the interior of the box body (51).

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