Mechanical pressure-regulating oil-immersed transformer

Abstract

The invention belongs to the technical field of transformers, particularly relates to a mechanical voltage regulation oil-immersed transformer, and aims to solve the problem that a downshift voltage regulation transformer in the prior art has larger harmonic waves during voltage regulation and then affects the stability of final output voltage, the following scheme is provided: the mechanical voltage regulation oil-immersed transformer comprises an outer barrel for containing cooling oil; a sealing top cover is clamped and fixed to a top end barrel opening of the outer barrel, a round hole is formed in the middle of the sealing top cover, a middle supporting pipe vertically extending downwards is inserted into the round hole, a base is fixedly connected to the position, close to the bottom end, of the circumferential outer wall of the middle supporting pipe in a sleeved mode, the shape of the base is similar to that of the sealing top cover, and the area of the base is smaller than that of the sealing top cover. According to the invention, the length of the effectively electrified secondary low-voltage coil can be gradually and uninterruptedly shortened along with the rotation of the rotary iron core during voltage regulation, so that stepless and non-gear-skipping type voltage transformation is realized, harmonic waves can be reduced, and the subsequent output voltage can be kept stable.

Description

Technical Field

[0001] The invention relates to the technical field of transformers, and in particular to a mechanical voltage regulating oil-immersed transformer. Background Art

[0002] A stepless voltage-regulating transformer is a transformer that can continuously adjust the output voltage. This type of transformer can smoothly and accurately adjust the voltage without changing the physical wiring by designing a special circuit or transformer structure, thereby achieving the required voltage value. It is now widely used in the field of hydrogen production. Unlike traditional stepped voltage-regulating transformers, stepless voltage-regulating transformers do not have fixed voltage levels, but provide a continuous voltage adjustment range.

[0003] After searching, it is found that transformers with voltage regulation in the prior art mostly adjust the voltage by downshifting across regions. Even if a sliding vane is provided to change the contact position with the secondary coil, it is a gear change within the span range. This voltage change not only generates a large load on the subsequent electrical appliances, but also causes large harmonics in the voltage regulation process. Therefore, we propose a stepless voltage regulating transformer to solve the problems existing in this downshifting voltage regulation. Summary of the invention

[0004] In view of the technical problem that the step-down voltage regulating transformer in the prior art will have large harmonics during voltage regulation, which will then affect the stability of the final output voltage, the present invention adopts the following technical solution:

[0005] A mechanical voltage-regulated oil-immersed transformer comprises an outer barrel for containing cooling oil, a sealing top cover is fixedly connected at the top barrel mouth of the outer barrel, a circular hole is opened in the middle of the sealing top cover, and an intermediate support tube extending vertically downward is inserted in the circular hole, a base is sleeved and fixed near the bottom of the circumferential outer wall of the intermediate support tube, and the base is similar in shape to the sealing top cover and has a smaller area than the sealing top cover; three groups of identical stepless shifting mechanisms are arranged between the base and the sealing top cover, and the stepless shifting mechanisms include a vertical rotating iron core rotatably connected between the sealing top cover and the base; shaft necks are reserved at both ends of the rotating iron core, and a through hole penetrating the upper and lower ends is arranged inside the rotating iron core Hole, each of which is provided with a stepless voltage output module; a slide groove penetrating the through hole is opened near the middle of the circumferential outer wall of the rotating iron core, and the stepless voltage output module includes a sliding contact slidably connected in the slide groove, and a metal clamping block protruding from the outer surface of the rotating iron core is arranged on the side of the sliding contact away from the through hole; a secondary low-voltage coil that does not contact the outer surface of the rotating iron core is wound around the circumferential outer wall of the rotating iron core, and two ends of the secondary low-voltage coil are respectively fixed on the sealing top cover and the base, and the metal clamping block is slidably clamped at the inner edge of the secondary low-voltage coil; and the circumferential outer wall of the secondary low-voltage coil is sleeved with an insulating sleeve; the outer wall of the insulating sleeve is wound with a primary high-voltage coil.

[0006] A further configuration is that the stepless voltage output module also includes an anti-twist cylindrical groove opened on the inner wall of the slide groove, and the sliding contact is slidably connected in the anti-twist cylindrical groove, a spring groove is opened on the side of the sliding contact close to the metal block, and a clamping spring is fixed between the bottom of the spring groove and the surface of the metal block; a fixed socket is opened on the side of the sliding contact close to the inside of the rotating iron core, and a soft wire is plugged and fixed in the fixed socket, a connecting rope is fixed to the middle of the soft wire, and a counterweight ball is fixed to the bottom end of the connecting rope, and the counterweight ball is slidably connected in the through hole.

[0007] A further configuration is that a U-shaped slot is reserved in the middle of one side of the metal block close to the secondary low-voltage coil, and a ball groove is opened in the middle of the bottom of the U-shaped slot, in which a metal ball is rotatably connected; guide rods extending to the sliding contact are fixed at the upper and lower ends of the metal block, and a sliding hole matching the guide rod is opened on the side of the sliding contact; by setting the sliding hole in conjunction with the setting of the guide rod, the metal block can be prevented from being skewed when the voltage is adjusted, that is, when the contact position of the metal block and the secondary low-voltage coil is changed, ensuring that it always maintains close contact with the secondary low-voltage coil to prevent poor contact.

[0008] A further configuration is that the shaft necks at both ends of the rotating iron core are respectively sleeved with mutually symmetrical tapered roller bearings, and the sealing top cover and the base are provided with bearing fixing holes that are compatible with the corresponding outer rings of the tapered roller bearings; a radial bearing is clamped on the top of the perforation in the middle of the rotating iron core, and the end of the soft wire away from the sliding contact is fixed to the inner ring of the radial bearing; through such a configuration, the soft wire inside the rotating iron core can be prevented from being twisted, and the outer wall of the insulating sleeve is reserved with two vertical ribs, and the upper and lower ends of the ribs are respectively fixed to the lower surface of the sealing top cover and the upper surface of the base.

[0009] A further configuration is that the top journal of the rotating iron core passes through the sealing top cover and is fixedly sleeved with a driven gear; and three supporting piers are fixed near the edge of the upper surface of the sealing top cover and are symmetrically distributed in the center, and the same top plate is fixed between the tops of the three supporting piers; and a mounting through hole is opened in the middle of the top plate, a sliding bearing ring is clamped in the mounting through hole, and a transmission pipe extending downward is rotatably connected in the sliding bearing ring; a small gear ring that is meshed with three driven gears is sleeved on the circumferential outer wall of the bottom end of the transmission pipe; a servo motor is embedded and fixed at one of the supporting piers on the lower surface of the top plate, and the output shaft of the servo motor faces downward, a driving pulley is fixed on the top of the output shaft of the servo motor, and a driven pulley of the same height as the driving pulley is sleeved on the circumferential outer wall of the transmission pipe, and the same transmission belt is wound between the circumferential outer walls of the driving pulley and the driven pulley; the convenience and stability of the pressure regulation are improved by the transmission belt and the small gear ring that can drive the three stepless gear shifting mechanisms to adjust the pressure at the same time.

[0010] A further configuration is that the circumferential outer wall of the middle support tube is provided with three wire grooves penetrating the upper and lower ends, and adapter wires are clamped in the wire grooves; the bottom end of the adapter wire is connected to the output end of the primary high-voltage coil through an electrical connector to form an electrical connection, and a wiring terminal is fixed on the top of the top plate to connect the high-voltage line and the output voltage; the three stepless gear shifting mechanisms are connected in parallel in the transformer circuit.

[0011] A further configuration is that the sealing top cover has a chamfered triangular structure as a whole, and positioning shafts are fixed at the three corners of the lower surface of the sealing top cover; docking blocks are fixed at the three corners of the inner wall of the outer barrel near the top, and limiting grooves matching the positioning shafts are reserved in the middle of the docking blocks; by providing a docking block with a limiting groove, not only can the sealing top cover be prevented from warping under heavy pressure, but also the sealing top cover can be prevented from rotating and shifting.

[0012] A further configuration is that a C-shaped pull ring is rotatably connected to one side of the bottom end of the supporting pier column away from the center position of the sealing top cover, and the C-shaped pull ring is made of hard high-strength steel, at least Q345 material with quality grade B, and a sliding hook with the hook facing upward is slidably connected to the outer wall of the outer barrel near the lower side of the corresponding C-shaped pull ring, and angle steel slide rails for clamping the sliding hook are fixed on both sides of the outer wall of the outer barrel on which the sliding hook is located; two reset springs are fixed to the bottom end of the sliding hook, and the bottom ends of the two reset springs are The same spring baffle is fixed, and the spring baffle is fixed on the surface of the outer barrel; a rope winding rod is fixed to the middle part of the side of the sliding hook away from the outer barrel, and a convex shaft is fixed to the surface of the corresponding supporting pier column just above the rope winding rod; through the provided convex shaft and rope winding rod, when the sealing top cover needs to be fastened, it is only necessary to tie the rope to the rope winding rod first, and then wrap it around the convex shaft and then pull it downward, at this time, the sliding hook below can be slowly lifted up until it hooks the C-shaped pull ring above, and then other C-shaped pull rings can be hooked one by one.

[0013] A further configuration is that a compression spring is fixed to the bottom end of the middle support tube, and a convex stop block is fixed to the bottom end of the compression spring, and a positioning groove matched with the convex stop block is reserved on the bottom inner wall of the outer barrel; the pre-tightening and anti-swaying movement effect of the device can be improved; rectangular holes are opened on one side of the outer barrel near the upper and lower ends, and a heat sink with the same internal cavity in a C-shaped structure is fixed between the two rectangular holes, and fins parallel to each other are reserved on the side of the heat sink away from the outer barrel.

[0014] A further configuration is that a reserved hole is opened on the side of the outer barrel near the top of the heat sink, and a sealed bearing is embedded in the reserved hole, and a C-shaped rotating straw is rotatably connected to the sealed bearing; the suction end of the C-shaped rotating straw faces the top inner part of the heat sink; the oil heated at the bottom can pass through the fins of the heat sink and then be sucked; the other end of the C-shaped rotating straw is connected to a circulating hose; a stepped sliding hole is reserved at the top of the middle support pipe, and a bottom plate is welded and fixed at the bottom of the stepped sliding hole, and a one-way valve 1 is embedded in the middle of the bottom plate, and the liquid flowing through the one-way valve 1 can only flow downward; a piston plate is slidably connected to the stepped sliding hole, and the piston A vertical reciprocating push rod is fixed to the middle of the upper surface of the plate, and a one-way valve No. 2 is embedded near the edge of the piston plate. The inlet end of the one-way valve No. 2 is connected to the other end of the circulating hose, so that the liquid in the circulating hose can be continuously drawn into the stepped slide hole and then injected into the bottom position of the outer barrel; a same return spring is fixed between the lower surface of the piston plate and the bottom plate; a motor frame is fixed to the upper surface of the top plate near the middle, and a reduction motor is fixed on the motor frame; a rotating wheel is fixed to the top of the output shaft of the reduction motor, and a movable shaft is fixed to the wheel surface near the circumferential edge, a connecting rod is sleeved on the movable shaft, and the bottom end of the connecting rod is hinged to the top of the reciprocating push rod.

[0015] The beneficial effects of the present invention are:

[0016] 1. By setting a metal clamp block that is clamped from the inside to the outside and tightly pressed against the secondary low-voltage coil, the length of the secondary low-voltage coil that is effectively energized can be gradually and continuously shortened as the rotating iron core rotates during voltage regulation, thereby achieving stepless and non-jumping voltage transformation, thereby reducing the occurrence of harmonics and allowing the subsequent output voltage to remain stable.

[0017] 2. By setting a weighted ball fixedly connected to the middle of the soft wire, it can be ensured that the soft wire used to connect the external connection will not be entangled when the rotating iron core rotates, that is, when the sliding contact changes position up and down.

[0018] 3. By providing a piston plate that is slidably connected in the stepped slide hole and cooperating with other auxiliary components, the circulation speed of the internal cooling oil through the heat sink with fins can be accelerated, thereby improving the cooling effect of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 It is a partial cross-sectional structural schematic diagram of the outer barrel of the present invention;

[0021] Figure 3 It is the overall assembly diagram of the present invention;

[0022] Figure 4 It is a half-section structural schematic diagram of the heat dissipation box of the present invention;

[0023] Figure 5 It is a front view of the internal structure of the present invention;

[0024] Figure 6 For the present invention Figure 5 Schematic diagram of the cross-sectional structure along line AA;

[0025] Figure 7 For the present invention Figure 6 A schematic diagram of the enlarged structure at B in the middle;

[0026] Figure 8 It is a schematic diagram of the overall structure of a single stepless gearshift mechanism of the present invention;

[0027] Fig. 9 This is a schematic diagram of the structure of the present invention after removing the primary high-voltage coil and the insulating sleeve;

[0028] Fig.10 For the present invention Fig. 9 A schematic diagram of a half-section three-dimensional structure;

[0029] Fig.11 It is a schematic diagram of the explosion structure of the sliding contact in the present invention.

[0030] In the figure: 1, outer barrel; 101, docking block; 102, rectangular hole; 2, heat sink; 3, sealed bearing; 301, C-shaped rotating straw; 4, circulation hose; 5, sealed top cover; 6, supporting pier; 7, driven gear; 8, servo motor; 9, stepless voltage output module; 901, counterweight ball; 902, sliding contact; 903, metal block; 904, spring slot; 10, reduction motor; 11, rotating wheel; 12, sliding bearing ring; 13, terminal; 14, top plate; 15. Protruding shaft; 16. C-shaped pull ring; 17. Sliding hook; 18. Angle steel slide rail; 19. Reset spring; 20. Stepless gear shifting mechanism; 21. Insulating sleeve; 22. Primary high-voltage coil; 2201. Transfer wire; 23. Base; 24. Compression spring; 25. Intermediate support tube; 2501. Wire trough; 26. Secondary low-voltage coil; 27. Conveyor belt; 28. Reciprocating push rod; 29. ​​Transmission tube; 30. Reset spring; 31. Piston plate; 32. Bottom plate; 33. One-way valve 1. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0032] In this embodiment, refer to Figure 1-11A mechanical voltage-regulated oil-immersed transformer comprises an outer barrel 1 for containing cooling oil, a sealing top cover 5 is fixedly connected at the top barrel mouth of the outer barrel 1, and a plurality of universal wheels are fixed at the bottom end of the outer barrel 1; a circular hole is opened in the middle of the sealing top cover 5, and an intermediate support tube 25 extending vertically downward is inserted in the circular hole, and a base 23 is sleeved and fixed near the bottom of the circumferential outer wall of the intermediate support tube 25, and the base 23 is similar in shape to the sealing top cover 5 and has a smaller area than the sealing top cover 5; three groups of identical stepless shifting mechanisms 20 are arranged between the base 23 and the sealing top cover 5, and the stepless shifting mechanism 20 comprises a vertical rotating iron core rotatably connected between the sealing top cover 5 and the base 23; shaft necks are reserved at both ends of the rotating iron core, and a through hole is arranged inside the rotating iron core to penetrate the upper and lower ends, and a stepless voltage output module 9 is arranged in the through hole; a sliding groove is opened near the middle of the circumferential outer wall of the rotating iron core to penetrate the through hole, and the stepless voltage output module 9 comprises a sliding groove A sliding contact 902 is connected to the slide groove, and a metal block 903 protruding from the outer surface of the rotating iron core is arranged on the side of the sliding contact 902 away from the perforation; a secondary low-voltage coil 26 which does not contact the outer surface of the rotating iron core is wound around the circumferential outer wall of the rotating iron core, and the two ends of the secondary low-voltage coil 26 are respectively fixed on the sealing top cover 5 and the base 23, and the metal block 903 is slidably engaged at the inner edge of the secondary low-voltage coil 26; and an insulating sleeve 21 is sleeved on the circumferential outer wall of the secondary low-voltage coil 26; the outer wall of the insulating sleeve 21 is wound with a primary high-voltage coil 22; by setting the metal block 903 which is engaged from the inside to the outside and is tightly pressed against the secondary low-voltage coil 26, the length of the effectively energized secondary low-voltage coil 26 can be gradually and uninterruptedly shortened as the rotating iron core rotates during voltage regulation, thereby realizing stepless and non-jumping type voltage transformation, thereby reducing the occurrence of harmonics and allowing the subsequent output voltage to remain stable.

[0033] In the present invention, reference is made to Figure 10-11 The stepless voltage output module 9 also includes an anti-twist cylindrical groove opened on the inner wall of the slide groove, and the sliding contact 902 is slidably connected in the anti-twist cylindrical groove, a spring groove 904 is opened on the side of the sliding contact 902 close to the metal block 903, and a tightening spring is fixed between the bottom of the spring groove 904 and the surface of the metal block 903; a fixed socket is opened on the side of the sliding contact 902 close to the inside of the rotating iron core, and a soft wire is plugged and fixed in the fixed socket, a connecting rope is fixed in the middle of the soft wire, and a counterweight ball 901 is fixed at the bottom of the connecting rope, and the counterweight ball 901 is slidably connected in the through hole; by setting the counterweight ball 901 fixedly connected to the middle of the soft wire, it can be ensured that the soft wire used to connect the external connection will not be entangled when the rotating iron core rotates, that is, when the sliding contact 902 changes its position up and down.

[0034] Reference Fig.11A U-shaped slot is reserved in the middle of one side of the metal block 903 close to the secondary low-voltage coil 26, and a ball groove is opened in the middle of the bottom of the U-shaped slot, and a metal ball is rotatably connected in the ball groove; guide rods extending to the sliding contact 902 are fixed to the upper and lower ends of the metal block 903, and a sliding hole compatible with the guide rod is opened on the side of the sliding contact 902; by setting the sliding hole in conjunction with the setting of the guide rod, the metal block 903 can be prevented from being skewed when the voltage is adjusted, that is, when the contact position of the metal block 903 and the secondary low-voltage coil 26 is changed, ensuring that it always maintains close contact with the secondary low-voltage coil 26 to prevent poor contact.

[0035] Reference Fig.11 The shaft necks at both ends of the rotating iron core are respectively sleeved with symmetrical tapered roller bearings, and the sealing top cover 5 and the base 23 are provided with bearing fixing holes that are compatible with the corresponding outer rings of the tapered roller bearings; a radial bearing is clamped on the top of the perforation in the middle of the rotating iron core, and the end of the soft wire away from the sliding contact 902 is fixed to the inner ring of the radial bearing; through such an arrangement, the soft wire inside the rotating iron core can be prevented from being twisted, and two vertical ribs are reserved on the outer wall of the insulating sleeve 21, and the upper and lower ends of the ribs are respectively fixed to the lower surface of the sealing top cover 5 and the upper surface of the base 23.

[0036] Reference Figure 2 , Figure 5-Figure 6 The top journal of the rotating iron core passes through the sealing top cover 5 and is fixedly sleeved with a driven gear 7; and three supporting piers 6 are fixed near the edge of the upper surface of the sealing top cover 5 and are symmetrically distributed in the center, and the same top plate 14 is fixed between the tops of the three supporting piers 6; and a mounting through hole is opened in the middle of the top plate 14, and a sliding bearing ring 12 is clamped in the mounting through hole, and a transmission tube 29 extending downward is rotatably connected in the sliding bearing ring 12; the outer wall of the bottom circumference of the transmission tube 29 is sleeved with small teeth that mesh with the three driven gears 7 at the same time Wheel ring; a servo motor 8 is embedded and fixed at one of the supporting piers 6 on the lower surface of the top plate 14, and the output shaft of the servo motor 8 faces downward, a driving pulley is fixed to the top of the output shaft of the servo motor 8, and the circumferential outer wall of the transmission tube 29 is sleeved with a driven pulley of the same height as the driving pulley, and the same transmission belt 27 is wound between the circumferential outer walls of the driving pulley and the driven pulley; by providing the transmission belt 27 and the small gear ring that can drive the three stepless gear shifting mechanisms 20 to adjust the pressure at the same time, the convenience and stability of the pressure regulation are improved.

[0037] Reference Figure 3 and Figure 5The circumferential outer wall of the middle support tube 25 is provided with three wire grooves 2501 penetrating the upper and lower ends, and the wire grooves 2501 are clamped with adapter wires 2201; the bottom end of the adapter wire 2201 is connected to the output end of the primary high-voltage coil 22 through an electrical connector and forms an electrical connection, and the top of the top plate 14 is fixed with a wiring terminal 13 for connecting the high-voltage line and the output voltage; the three stepless gear shifting mechanisms 20 are connected in parallel in the transformer circuit.

[0038] Reference Figure 1 and Figure 3-Figure 4 The sealing top cover 5 is an overall chamfered triangular structure, and positioning shafts are fixed on the lower surface of the sealing top cover 5 near the three corners; docking blocks 101 are fixed on the three corners of the inner wall of the outer barrel 1 near the top, and limiting grooves matched with the positioning shafts are reserved in the middle of the docking blocks 101; by providing the docking blocks 101 with limiting grooves, not only can the sealing top cover 5 be prevented from warping under heavy pressure, but also the sealing top cover 5 can be prevented from rotating and shifting.

[0039] Reference Figure 1-Figure 2 The bottom end of the supporting pier 6 is rotatably connected to a C-shaped pull ring 16 on one side away from the center of the sealing top cover 5, and the C-shaped pull ring 16 is made of hard high-strength steel, at least Q345 quality grade B material, and the outer wall of the outer barrel 1 is slidably connected to a sliding hook 17 with the hook facing upwards near the corresponding C-shaped pull ring 16. The outer wall of the outer barrel 1 is located on both sides of the sliding hook 17 and is fixed with an angle steel slide rail 18 for clamping the sliding hook 17; the bottom end of the sliding hook 17 is fixed with two reset springs 19, and the bottom ends of the two reset springs 19 are fixed with the same A spring baffle is fixed on the surface of the outer barrel 1; a rope-winding rod is fixed to the middle of the side of the sliding hook 17 away from the outer barrel 1, and a convex shaft 15 is fixed to the surface of the corresponding supporting pier 6 just above the rope-winding rod; through the provided convex shaft 15 and the rope-winding rod, when it is necessary to tighten the sealing top cover 5, it is only necessary to tie the rope to the rope-winding rod first, then wrap it around the convex shaft 15 upwards and then pull it downwards, at this time, the sliding hook 17 below can be slowly lifted up until it hooks the C-shaped pull ring 16 above, and then the other C-shaped pull rings 16 can be hooked one by one.

[0040] Reference Figure 2-Figure 3 A compression spring 24 is fixed to the bottom end of the middle support tube 25, and a convex stop block is fixed to the bottom end of the compression spring 24, and a positioning groove matched with the convex stop block is reserved on the bottom inner wall of the outer barrel 1; the pre-tightening and anti-swaying movement effect of the device can be improved; rectangular holes 102 are opened on one side of the outer barrel 1 near the upper and lower ends, and a heat dissipation box 2 with the same internal cavity in a C-shaped structure is fixed between the two rectangular holes 102, and fins parallel to each other are reserved on the side of the heat dissipation box 2 away from the outer barrel 1; the heat dissipation effect is improved.

[0041] Reference Figure 2 , Figure 6-Figure 7 A reserved hole is opened on the side of the outer barrel 1 near the top of the heat sink 2, and a sealed bearing 3 is embedded in the reserved hole, and a C-shaped rotating suction pipe 301 is rotatably connected in the sealed bearing 3; the suction end of the C-shaped rotating suction pipe 301 faces the top inner part of the heat sink 2; the oil heated at the bottom can pass through the fins of the heat sink 2 and then be sucked; the other end of the C-shaped rotating suction pipe 301 is connected to a circulation hose 4; a stepped sliding hole is reserved at the top of the middle support pipe 25, and a bottom plate 32 is welded and fixed at the bottom of the stepped sliding hole, and a one-way valve 33 is embedded in the middle of the bottom plate 32, and the liquid flowing through the one-way valve 33 can only flow downward; a piston plate 31 is slidably connected in the stepped sliding hole, and a vertical reciprocating push rod 28 is fixed in the middle of the upper surface of the piston plate 31, and the piston plate 31 is embedded near the edge A one-way valve 2 is installed, and the inlet end of the one-way valve 2 is connected to the other end of the circulation hose 4, so that the liquid of the circulation hose 4 can be continuously drawn into the stepped slide hole, and then injected into the bottom position of the outer barrel 1; a same return spring 30 is fixed between the lower surface of the piston plate 31 and the bottom plate 32; a motor frame is fixed to the upper surface of the top plate 14 near the middle, and a reduction motor 10 is fixed on the motor frame; a rotating wheel 11 is fixed to the top end of the output shaft of the reduction motor 10, and a movable shaft is fixed to the wheel surface of the rotating wheel 11 near the circumferential edge, a connecting rod is sleeved on the movable shaft, and the bottom end of the connecting rod is hinged to the top end of the reciprocating push rod 28; by setting a piston plate 31 slidably connected to the stepped slide hole, in conjunction with other auxiliary components, the circulation speed of the internal cooling oil can be accelerated and the cooling effect of the device can be improved.

[0042] Working principle: Before using the device, first install all components and then hoist them into the outer barrel 1 with the opening facing upward, and then fill it with cooling oil; then reinforce the C-shaped pull ring 16 at the corner. When it is necessary to fasten the sealing top cover 5, just tie the rope to the rope rod first, then go around the convex shaft 15 upward and pull it downward. At this time, slowly lift the sliding hook 17 below until it hooks the C-shaped pull ring 16 above, and then hook the other C-shaped pull rings 16 one by one; when adjusting the pressure It is only necessary to control the servo motor 8 to start. As the transmission belt 27 rotates, the small gear ring used to control the operation of the three stepless gear-changing mechanisms 20 will also rotate. Then, as the rotating iron core rotates, the metal block 903 that is slidably engaged on the inner wall of the spiral secondary low-voltage coil 26 will continuously change its contact position. This allows the length of the effectively energized secondary low-voltage coil 26 to gradually and continuously shorten, thereby achieving stepless and non-skipping voltage transformation, thereby reducing the occurrence of harmonics and allowing the subsequent output voltage to remain stable.

[0043] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A mechanical voltage regulating oil-immersed transformer, comprising an outer barrel (1) for containing cooling oil, wherein a sealing top cover (5) is fixedly connected to the top of the barrel opening of the outer barrel (1); characterized in that: A circular hole is formed in the middle of the sealing top cover (5), and an intermediate support tube (25) extending vertically downward is inserted into the circular hole. A base (23) is sleeved and fixed to the circumferential outer wall of the intermediate support tube (25) near the bottom end. The base (23) is similar in shape to the sealing top cover (5) and has a smaller area than the sealing top cover (5). Three groups of identical stepless shifting mechanisms (20) are arranged between the base (23) and the sealing top cover (5), and the stepless shifting mechanism (20) includes a rotating iron core that is rotatably connected vertically between the sealing top cover (5) and the base (23). Both ends of the rotating iron core are provided with shaft necks, and the interior of the rotating iron core is provided with through holes that penetrate the upper and lower ends, and the through holes are provided with stepless A voltage output module (9); a sliding groove that penetrates the through hole is opened near the middle of the circumferential outer wall of the rotating iron core, and the stepless voltage output module (9) includes a sliding contact (902) slidably connected in the sliding groove, and a metal clamping block (903) protruding from the outer surface of the rotating iron core is arranged on the side of the sliding contact (902) away from the through hole; a secondary low-voltage coil (26) that does not contact the outer surface of the rotating iron core is wound around the circumferential outer wall of the rotating iron core, and the metal clamping block (903) is slidably clamped at the inner edge of the secondary low-voltage coil (26); and an insulating sleeve (21) is sleeved on the circumferential outer wall of the secondary low-voltage coil (26); and a primary high-voltage coil (22) is wound around the outer wall of the insulating sleeve (21).

2. A mechanical voltage regulating oil-immersed transformer according to claim 1, characterized in that: The stepless voltage output module (9) further comprises an anti-twist cylindrical groove provided on the inner wall of the slide groove, and the sliding contact (902) is slidably connected in the anti-twist cylindrical groove, a spring groove (904) is provided on the side of the sliding contact (902) close to the metal clamping block (903), and a clamping spring is fixed between the groove bottom of the spring groove (904) and the surface of the metal clamping block (903); a fixed plug hole is provided on the side of the sliding contact (902) close to the inside of the rotating iron core, and a soft wire is inserted and fixed in the fixed plug hole, a connecting rope is fixed in the middle of the soft wire, and a counterweight ball (901) is fixed at the bottom end of the connecting rope, and the counterweight ball (901) is slidably connected in the through hole.

3. A mechanical voltage regulating oil-immersed transformer according to claim 2, characterized in that: A U-shaped slot is reserved in the middle of one side of the metal block (903) close to the secondary low-voltage coil (26), and a ball groove is opened in the middle of the bottom of the U-shaped slot, and a metal ball is rotatably connected in the ball groove; guide rods extending toward the sliding contact (902) are fixed at both upper and lower ends of the metal block (903), and a sliding hole matching the guide rod is opened on the side of the sliding contact (902).

4. The mechanical voltage regulating oil-immersed transformer according to claim 2, characterized in that: The shaft necks at both ends of the rotating iron core are respectively sleeved with symmetrical tapered roller bearings, and the sealing top cover (5) and the base (23) are both provided with bearing fixing holes that are compatible with the outer rings of the corresponding tapered roller bearings; the top of the perforation in the middle of the rotating iron core is clamped with a radial bearing, and the end of the soft wire away from the sliding contact (902) is fixed to the inner ring of the radial bearing; the outer wall of the insulating sleeve (21) is reserved with two vertical ribs, and the upper and lower ends of the ribs are respectively fixed to the lower surface of the sealing top cover (5) and the upper surface of the base (23).

5. The mechanical voltage regulating oil-immersed transformer according to claim 1, characterized in that: The top end journal of the rotating iron core passes through the sealing top cover (5) and is fixedly sleeved with a driven gear (7); three supporting columns (6) are fixed near the edge of the upper surface of the sealing top cover (5) and are symmetrically distributed in the center, and a top plate (14) is fixed between the top ends of the three supporting columns (6); a mounting through hole is opened in the middle of the top plate (14), a sliding bearing ring (12) is clamped in the mounting through hole, and a transmission pipe (29) extending downward is rotatably connected in the sliding bearing ring (12); the transmission pipe (29) The outer circumferential wall at the bottom end is sleeved with a small gear ring that meshes with three driven gears (7) at the same time; a servo motor (8) is embedded and fixed at one of the supporting piers (6) on the lower surface of the top plate (14), and the output shaft of the servo motor (8) faces downward, a driving pulley is fixed to the top of the output shaft of the servo motor (8), and the outer circumferential wall of the transmission tube (29) is sleeved with a driven pulley of the same height as the driving pulley, and the same transmission belt (27) is wound between the outer circumferential walls of the driving pulley and the driven pulley.

6. The mechanical voltage regulating oil-immersed transformer according to claim 1, characterized in that: The circumferential outer wall of the intermediate support tube (25) is provided with three wire grooves (2501) penetrating the upper and lower ends, and a switching wire (2201) is clamped in the wire groove (2501); the bottom end of the switching wire (2201) is connected to the output end of the primary high-voltage coil (22) through an electrical connector to form an electrical connection, and a wiring terminal (13) is fixed on the top of the top plate (14) for connecting the high-voltage wire and the output voltage; the three stepless gear shifting mechanisms (20) are connected in parallel in the transformer circuit.

7. The mechanical voltage regulating oil-immersed transformer according to claim 1, characterized in that: The sealing top cover (5) is in the form of a chamfered triangular structure, and positioning shafts are fixed to the bottom surface of the sealing top cover (5) near the three corners; docking blocks (101) are fixed to the inner wall of the outer barrel (1) near the three corners of the top, and limiting notches are reserved in the middle of the docking blocks (101) to match the positioning shafts.

8. The mechanical voltage regulating oil-immersed transformer according to claim 1, characterized in that: The bottom end of the supporting pier (6) is rotatably connected to a C-shaped pull ring (16) on one side away from the center of the sealing top cover (5), and the C-shaped pull ring (16) is made of hard high-strength steel, at least Q345 quality grade B material. The outer wall of the outer barrel (1) is slidably connected to a sliding hook (17) with the hook facing upward near the lower side of the corresponding C-shaped pull ring (16), and the outer wall of the outer barrel (1) is located on both sides of the sliding hook (17) and is fixed with an angle steel slide rail (18) for clamping the sliding hook (17); two reset tension springs (19) are fixed to the bottom ends of the sliding hook (17), and the same spring baffle is fixed to the bottom ends of the two reset tension springs (19), and the spring baffle is fixed to the surface of the outer barrel (1); a rope winding rod is fixed to the middle part of the side of the sliding hook (17) away from the outer barrel (1), and a convex shaft (15) is fixed to the surface of the corresponding supporting pier (6) just above the rope winding rod.

9. The mechanical voltage regulating oil-immersed transformer according to claim 1, characterized in that: A compression spring (24) is fixed to the bottom end of the middle support tube (25), and a convex stop block is fixed to the bottom end of the compression spring (24), and a positioning groove matched with the convex stop block is reserved on the bottom inner wall of the outer barrel (1); the pre-tightening and anti-swaying movement effect of the device can be improved; a rectangular hole (102) is opened on one side of the outer barrel (1) near the upper and lower ends, and a heat dissipation box (2) with a C-shaped structure and a same internal cavity is fixed between the two rectangular holes (102); and fins parallel to each other are reserved on the side of the heat dissipation box (2) away from the outer barrel (1).

10. The mechanical voltage regulating oil-immersed transformer according to claim 9, characterized in that: A reserved hole is provided on the side of the outer barrel (1) near the top of the heat sink (2), and a sealing bearing (3) is embedded in the reserved hole, and a C-shaped rotating suction pipe (301) is rotatably connected to the sealing bearing (3); the suction end of the C-shaped rotating suction pipe (301) faces the top of the heat sink (2); the other end of the C-shaped rotating suction pipe (301) is connected to a circulation hose (4); a stepped sliding hole is reserved at the top of the intermediate support tube (25), and a bottom plate (32) is welded and fixed at the bottom of the stepped sliding hole, and a one-way valve (33) is embedded in the middle of the bottom plate (32), and liquid flowing through the one-way valve (33) can only flow downward; a piston plate (31) is slidably connected to the stepped sliding hole. , and a vertical reciprocating push rod (28) is fixed in the middle of the upper surface of the piston plate (31), and a check valve 2 is embedded near the edge of the piston plate (31), and the inlet end of the check valve 2 is connected to the other end of the circulation hose (4); a same return spring (30) is fixed between the lower surface of the piston plate (31) and the bottom plate (32); a motor frame is fixed near the middle of the upper surface of the top plate (14), and a reduction motor (10) is fixed on the motor frame; a rotating wheel (11) is fixed to the top of the output shaft of the reduction motor (10), and a movable shaft is fixed to the wheel surface of the rotating wheel (11) near the circumferential edge, a connecting rod is sleeved on the movable shaft, and the bottom end of the connecting rod is hinged to the top of the reciprocating push rod (28).

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