Three-phase five-column rectifier transformer adopting crossed coils

Abstract

The invention discloses a three-phase five-column rectifier transformer adopting crossed coils, and relates to the technical field of transformers, the rectifier transformer comprises a protective shell, the inner side of the protective shell is provided with a dry-type transformer body, and the upper end of the protective shell is provided with a high-voltage bushing and a low-voltage bushing; the left end and the right end of the protective shell are each provided with a fixed installation panel, and the front end and the rear end of the protective shell are each provided with a heat dissipation frame connected with the heat dissipation fin body. The problems that according to a conventional transformer, due to the fact that a winding connection method of the conventional transformer can cause electrical performance imbalance, load currents borne by an upper coil and a lower coil are unbalanced during operation of the transformer, safe operation of rear-end load equipment can be threatened and the transformer is damaged when the load currents are serious, and meanwhile wire outlet copper bars of a traditional structure are distributed at different positions of the upper portion and the lower portion of the transformer. And the heights are inconsistent, so that the external wiring is inconvenient, and the installation efficiency is reduced.

Description

Technical Field

[0001] This invention relates to the field of transformer technology, and specifically to a three-phase five-limb rectifier transformer employing a cross-type coil. Background Technology

[0002] In fields such as industrial electrolysis and electrochemistry that require high-current DC power supplies, three-phase five-limb axial double-split rectifier transformers are widely used. Each phase of this type of transformer typically consists of two coils arranged symmetrically on the upper and lower sides. As the core component for transmitting electrical energy, the structure of the coils directly affects the reliability and production efficiency of the transformer.

[0003] Compared to existing rectifier transformers, conventional transformers have the following drawbacks: their winding connection methods can cause electrical performance imbalances, resulting in uneven load currents on the upper and lower coils during operation. In severe cases, this can threaten the safe operation of downstream load equipment and damage the transformer itself. In addition, the copper busbars of the traditional structure are distributed at different positions on the upper and lower parts of the transformer, with inconsistent heights, making external wiring inconvenient and reducing installation efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide a three-phase five-limb rectifier transformer with cross-type coils, which solves the following technical problems: Conventional transformers, due to their winding connection methods, will cause electrical performance imbalance, resulting in an uneven load current borne by the upper and lower coils during transformer operation. In severe cases, this will threaten the safe operation of downstream load equipment and cause damage to the transformer itself. At the same time, the copper busbars of the traditional structure are distributed at different positions on the upper and lower parts of the transformer, with inconsistent heights, making external wiring inconvenient and reducing installation efficiency.

[0005] The objective of this invention can be achieved through the following technical solutions: A three-phase five-limb rectifier transformer with cross-type coils includes: a protective shell, a dry-type transformer body disposed inside the protective shell, a high-voltage bushing and a low-voltage bushing disposed at the upper end of the protective shell, fixed mounting panels disposed at both the left and right ends of the protective shell, and heat dissipation frames disposed at both the front and rear ends of the protective shell that are connected to the heat dissipation fin body. The axial double-split coil on the valve side of the dry-type transformer body adopts an inner and outer cross winding method.

[0006] As a further aspect of the present invention: the low-voltage coil of the dry-type transformer body is divided into four coils, upper and lower, and the coils connected to each other form a cross coil as a whole.

[0007] As a further aspect of the present invention: the fixed mounting panel is threadedly connected to the protective shell by a first bolt, and the fixed mounting panel has a first vent hole equidistantly opened inside, and a dust removal cotton is provided on the inner side of the first vent hole.

[0008] As a further aspect of the present invention: the inner side of the fixed mounting panel is threadedly connected to a mounting box by a second bolt, and the inner side of the mounting box is provided with blades that are driven to rotate by a first servo motor. The inner end of the mounting box is provided with second vent holes that correspond to the positions of the first vent holes at equal intervals.

[0009] As a further aspect of the present invention: a graphene film is provided at the inner end of the heat dissipation frame, the inner end of the heat dissipation frame is fitted to the front and rear end surfaces of the protective shell, and the heat dissipation frame is threadedly connected to the protective shell by a third bolt.

[0010] As a further embodiment of the present invention: the inner side of the outer end of the heat dissipation frame is also provided with symmetrically arranged limiting grooves; A gear disk is provided on the lower inner side of the heat dissipation frame, and an internal toothed belt is provided on the outer side of the gear disk.

[0011] As a further aspect of the present invention: the gear disk is meshed with an internal gear belt, and a reciprocating lead screw is fixedly installed on the upper end of the gear disk.

[0012] As a further aspect of the present invention: the reciprocating lead screw is threadedly connected to a movable bracket, and the movable bracket forms an engaging lifting motion on the heat dissipation frame through a limiting groove, which is used to adjust the movable bracket up and down.

[0013] As a further aspect of the present invention: the inner end of the movable bracket is provided with sponge wipes at equal intervals, and the outer surface of the sponge wipes is attached to the outer surface of the heat dissipation fin body.

[0014] As a further aspect of the present invention: a flow guide groove is provided through the inner side of the heat dissipation fin body, and flow guide holes are provided on both the upper and lower sides of the flow guide groove, located inside the heat dissipation fin body. The inner side of the guide hole is arc-shaped, and the guide hole is inclined.

[0015] The beneficial effects of this invention are: 1. A heat dissipation fin body is fixedly installed on the outer end of the heat dissipation frame. When too much heat is generated inside the protective shell, the heat dissipation fin body can actively dissipate heat. The inner side of the heat dissipation fin body is provided with flow guide grooves and flow guide holes, which can not only reduce the overall weight, but also improve heat dissipation. Additionally, fixed mounting panels are installed on both the left and right ends of the protective casing. When the heat dissipation of the heat sink body is unbalanced, the first servo motor can be turned on to rotate the blades and force the heat inside the protective casing to dissipate heat, so as to avoid the phenomenon of damage to the dry-type transformer body due to high temperature and heat. 2. By cross-connecting, the two split coils of each phase are made more symmetrical in magnetic and electrical circuits, which greatly reduces the DC resistance and impedance deviation of the upper and lower coils, fundamentally ensuring the balanced distribution of load current and improving the operating efficiency and power factor of the transformer. This avoids localized overheating caused by uneven current, significantly reduces the risk of excessive temperature rise, extends transformer life, and ensures the safe and stable operation of downstream load equipment. All main outgoing copper busbars are neatly arranged at the top, while the neutral wires are concentrated at the bottom, which greatly facilitates cable wiring and connection for customers and improves installation efficiency and aesthetics. Attached Figure Description

[0016] The invention will now be further described with reference to the accompanying drawings.

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic cross-sectional view of the connection between the protective shell and the fixed mounting panel of the present invention; Figure 3 This is a schematic cross-sectional view of the connection between the protective shell and the heat dissipation frame of the present invention; Figure 4 This is a schematic diagram of the overall structure of the dry-type transformer body of the present invention; Figure 5 This is an exploded view of the overall structure of the fixed mounting panel of the present invention; Figure 6 This is an exploded view of the connection structure of the heat dissipation frame of the present invention; Figure 7 This is an exploded view of the overall structure of the sponge and the heat sink fin body of the present invention. Figure 8 This is a schematic diagram of the low-voltage wiring of the present invention; Figure 9 This is a schematic diagram of the inner and outer cross-winding method of the present invention.

[0018] In the diagram: 1. Protective outer casing; 2. Dry-type transformer body; 3. High-voltage bushing; 4. Low-voltage bushing; 5. Fixed mounting panel; 501. First bolt; 502. First vent; 503. Dust removal cotton; 504. Mounting box; 505. Second bolt; 506. Second vent; 507. First servo motor; 508. Blade; 6. Heat dissipation frame; 601. Third bolt; 602. Limiting groove; 603. Second servo motor; 604. Gear disk; 605. Internal gear belt; 606. Reciprocating lead screw; 607. Movable bracket; 608. Sponge; 7. Heat dissipation fin body; 701. Guide groove; 702. Guide hole. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Please see Figure 1-9 As shown, the present invention is a three-phase five-limb rectifier transformer using a cross-type coil.

[0021] Example 1 Please see Figure 1 - Figure 5 , Figure 8 and Figure 9 In this invention, a technical solution is provided: a protective shell 1, a dry-type transformer body 2 is provided on the inner side of the protective shell 1, a high-voltage bushing 3 and a low-voltage bushing 4 are respectively provided on the upper end of the protective shell 1, a fixed mounting panel 5 is provided on both the left and right ends of the protective shell 1, and a heat dissipation frame 6 connected to the heat dissipation fin body 7 is provided on both the front and rear ends of the protective shell 1. The axial double-split coils on the valve side of the dry-type transformer body adopt an inner and outer cross winding method.

[0022] Furthermore, the low-voltage coil of the dry-type transformer body 2 is divided into four coils, one above the other, and the coils connected above and below form a cross coil as a whole.

[0023] Furthermore, the fixed mounting panel 5 is threadedly connected to the protective shell 1 by the first bolt 501, and the fixed mounting panel 5 has first ventilation holes 502 equidistantly opened inside, and dust removal cotton 503 is provided on the inner side of the first ventilation holes 502.

[0024] Furthermore, the inner side of the fixed mounting panel 5 is threadedly connected to the mounting box 504 by the second bolt 505, and the inner side of the mounting box 504 is provided with a blade 508 driven to rotate by the first servo motor 507. The inner end of the mounting box 504 is provided with second vent holes 506 that correspond to the positions of the first vent holes 502.

[0025] Furthermore, a flow guide groove 701 is provided through the inner side of the heat dissipation fin body 7, and flow guide holes 702 located inside the heat dissipation fin body 7 are provided on both the upper and lower sides of the flow guide groove 701. The inner side of the guide hole 702 is arc-shaped, and the guide hole 702 is inclined.

[0026] Specifically, the dry-type transformer body 2 is first fixed to the inside of the protective shell 1 using building bolts, and connected using an inner and outer cross-winding method. The low-voltage coils on the dry-type transformer body 2 are divided into four coils, upper and lower. The upper inner coil is connected to the lower outer coil, and the upper outer coil is connected to the lower inner coil. The upper and lower connected coils form a cross-winding as a whole. Through cross-connection, the total path length of the current from the top to any endpoint is automatically balanced, fundamentally eliminating the problem of uneven current distribution, improving transformer efficiency and reliability, and reducing the risk of temperature rise. At the same time, since electrical balance is achieved through internal connection, when physical conditions occur, all main output lines that need to be connected to external loads can be neatly arranged at the top of the dry-type transformer body 2, while the neutral wire is arranged at the bottom. For users, wiring becomes very convenient and neat.

[0027] Subsequently, when the dry-type transformer body 2 generates heat during continuous operation, it can be actively cooled by the heat dissipation fin body 7. When the heat imbalance is too high, the active cooling of the heat dissipation fin body 7 fails, and the fixed mounting panel 5 can be used to intervene to achieve forced cooling. When the first servo motor 507 is turned on to drive the blades 508 to rotate, the heat inside the protective shell 1 can be drawn out through the second vent 506 and blown out. The fixed mounting panel 5 has first vents equidistantly arranged on its inner side, corresponding to the positions of the second vents 506. Vent 502 allows heat to be drawn out through the first vent 502 after being drawn in through the second vent 506, thus achieving forced heat dissipation. Dust removal cotton 503 is installed inside the first vent 502 to block dust from entering the air when not in use. A second bolt 505 is provided at the connection between the mounting box 504 and the fixed mounting panel 5, and a first bolt 501 is provided at the connection between the fixed mounting panel 5 and the protective shell 1. These features allow for independent disassembly, cleaning, or replacement later.

[0028] The heat dissipation fin body 7 features a through-type flow guide groove 701 on its inner side and flow guide holes 702 on both sides of the heat dissipation fin body 7 on its outer side. This design can disrupt the laminar boundary layer on the surface of the heat dissipation fin body 7, enhance fluid turbulence, and thus improve heat transfer. The principle is that when air flows over the smooth surface of the heat dissipation fin body 7, a thin layer called the "boundary layer" is formed. Within the boundary layer, the fluid velocity is very low and its thermal conductivity is poor, acting like a "heat insulation film" that hinders heat transfer from the heat dissipation fin body 7 to the mainstream fluid. The flow guide groove 701 and flow guide holes 702 can disrupt the boundary layer and generate eddies. The geometry of the flow guide groove 701 forces the fluid to continuously separate and reattach. Periodically breaking and thinning the thermal boundary layer ensures that heat exchange continues in a highly efficient state. When the fluid flows through the guide hole 702, strong vortices are generated inside and behind the guide hole 702. These vortices act like small stirrers, thoroughly mixing the low-temperature fluid in the core area with the high-temperature fluid on the fin surface, greatly improving the heat exchange capacity. At the same time, the uniform opening of the guide groove 701 and guide hole 702 can reduce the use of metal materials without affecting the structural strength, thereby reducing the overall weight of the radiator. Furthermore, the guide groove 701 and guide hole 702, as a surface strengthening structure, can act like "stiffeners," increasing the bending stiffness of the heat dissipation fin body 7 and reducing vibration and noise that may be generated in high-velocity airflow.

[0029] Example 2 This embodiment is derived based on Embodiment 1. Please refer to [link / reference]. Figure 1 , Figure 2 , Figure 3 , Figure 6 and Figure 7 In this invention, a technical solution is provided: a graphene film is provided on the inner end of the heat dissipation frame 6, the inner end of the heat dissipation frame 6 is attached to the front and rear end surfaces of the protective shell 1, and the heat dissipation frame 6 is threadedly connected to the protective shell 1 by a third bolt 601.

[0030] Furthermore, the inner side of the outer end of the heat dissipation frame 6 is also provided with symmetrically arranged limiting grooves 602. A gear disk 604 is provided on the lower inner side of the heat dissipation frame 6, and an internal gear belt 605 is provided on the outer side of the gear disk 604.

[0031] Furthermore, the gear disk 604 is meshed with the internal gear belt 605, and a reciprocating lead screw 606 is fixedly installed on the upper end of the gear disk 604.

[0032] Furthermore, the reciprocating lead screw 606 is threadedly connected to a movable bracket 607 on its outer side. The movable bracket 607 forms a locking lifting motion on the heat dissipation frame 6 through the limiting groove 602, which is used to adjust the movable bracket 607 up and down.

[0033] Furthermore, sponge wipers 608 are evenly distributed at the inner end of the movable bracket 607, and the outer surface of the sponge wipers 608 is attached to the outer surface of the heat dissipation fin body 7.

[0034] Specifically, in conjunction with Embodiment 1, through active and forced heat dissipation, the temperature of the dry-type transformer body 2 inside the protective housing 1 can be kept within a controllable range. When the heat dissipation fin body 7 is used for a long time, or when it is idle without any shielding, a large amount of dust will remain on the surface of the heat dissipation fin body 7 and in the guide groove 701 and guide hole 702, resulting in a reduction in heat dissipation efficiency in the later stage. Therefore, when the second servo motor 603 is turned on to rotate the gear disk 604, the gear disk 604 and its corresponding single gear disk 604 can be driven to rotate synchronously and in the same direction through the internal toothed belt 605 meshing with the outer side of the gear disk 604. This causes the reciprocating screw 606 fixedly installed on the upper end of the gear disk 604 to rotate synchronously. At this time, through the threaded connection between the reciprocating screw 606 and the movable bracket 607, the movable bracket 607 can move up and down reciprocally at the outer end of the heat dissipation frame 6 through the limiting groove 602, so that the sponge 608 set at the inner end of the movable bracket 607 can be used to clean the outer surface of the heat dissipation fin body 7 and reduce the adhesion of dust.

[0035] Dust removal from the heat dissipation fin body 7 allows heat to dissipate smoothly, significantly improving heat dissipation efficiency, extending service life, reducing maintenance costs, ensuring equipment operational stability, and improving air quality.

[0036] Example 3 This embodiment is derived based on Embodiment 1 and Embodiment 2. Please refer to [link / reference]. Figure 8 and Figure 9 This invention provides a technical solution: a cross-type coil winding connection method for a three-phase five-limb rectifier transformer. Each phase of the transformer's low-voltage side includes an upper coil and a lower coil symmetrically arranged vertically. Each coil consists of an inner coil and an outer coil. The core of this method lies in the use of a cross-type electrical connection. For each phase (taking phase A as an example): the beginning of the inner coil (a1) of the upper coil is electrically connected to the beginning of the outer coil (a1') of the lower coil, serving as an output terminal of that phase (denoted as A1). The tail end or intermediate tap of the coil is internally connected according to circuit requirements to form a complete double split structure. For example, taps x1, x4, etc. are used to form the midpoint of a double anti-star connection. Phases B and C have the same cross-connection logic as phase A, namely "upper inner to lower outer, upper outer to lower inner". The outgoing line layout, through cross connection, ultimately arranges the main outgoing copper busbars of the left and right phases (a1 and a4 of phase A, b3 and b6 of phase B, and c5 and c2 of phase C) on the upper part of the transformer, with the same height. At the same time, the two neutral wires (01 and 02) required for transformer operation are concentrated in the lower part of the transformer.

[0037] In terms of structural deformation, the winding method of the coil (such as spiral, disc, etc.), insulation material, fixing method, etc. can be conventionally replaced, but the electrical connection relationship of "upper inner to lower outer, upper outer to lower inner" must be maintained. Among them, axial double splitting refers to the low-voltage coil of the transformer being divided into two electrically independent parts with basically the same parameters in the axial direction; cross-type coil winding / connection method refers to the electrical connection method of "connecting the upper inner coil to the lower outer coil, and connecting the upper outer coil to the lower inner coil"; DC resistance / impedance balance refers to the DC resistance and impedance values ​​of the upper and lower split coils of the transformer being very close, with the difference within the very small range allowed by engineering.

[0038] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A three-phase five-limb rectifier transformer employing a cross-type coil, characterized in that, The device includes a protective housing, on the inner side of which a dry-type transformer body is provided. A high-voltage bushing and a low-voltage bushing are respectively provided on the upper end of the protective housing. Fixed mounting panels are provided on both the left and right ends of the protective housing. Heat dissipation frames connected to the heat dissipation fin body are provided on both the front and rear ends of the protective housing. The axial double-split coil on the valve side of the dry-type transformer body adopts an inner and outer cross winding method.

2. A three-phase five-limb rectifier transformer employing a cross-type coil according to claim 1, characterized in that, The low-voltage coil of the dry-type transformer body is divided into four coils, one above the other, and the coils connected above and below form a cross coil as a whole.

3. A three-phase five-limb rectifier transformer employing a cross-type coil according to claim 1, characterized in that, The fixed mounting panel is threadedly connected to the protective shell by the first bolt. The fixed mounting panel has first ventilation holes equidistantly opened inside, and dust removal cotton is provided on the inner side of the first ventilation holes.

4. A three-phase five-limb rectifier transformer employing a cross-type coil according to claim 3, characterized in that, The inner side of the fixed mounting panel is connected to a mounting box by a second bolt thread, and the inner side of the mounting box is provided with blades that are driven to rotate by a first servo motor. The inner end of the mounting box is provided with second vent holes that correspond to the positions of the first vent holes at equal intervals.

5. A three-phase five-limb rectifier transformer employing a cross-type coil according to claim 1, characterized in that, The inner end of the heat dissipation frame is provided with a graphene film, and the inner end of the heat dissipation frame is fitted to the front and rear end surfaces of the protective shell. The heat dissipation frame is threadedly connected to the protective shell by a third bolt.

6. A three-phase five-limb rectifier transformer employing a cross-type coil according to claim 5, characterized in that, The outer end of the heat dissipation frame is also provided with symmetrically arranged limiting grooves. A gear disk is provided on the lower inner side of the heat dissipation frame, and an internal toothed belt is provided on the outer side of the gear disk.

7. A three-phase five-limb rectifier transformer employing a cross-type coil according to claim 6, characterized in that, The gear disk is meshed with an internal gear belt, and a reciprocating lead screw is fixedly installed on the upper end of the gear disk.

8. A three-phase five-limb rectifier transformer employing a cross-type coil according to claim 7, characterized in that, The reciprocating lead screw is threaded to a movable bracket on its outer side. The movable bracket is engaged with the heat dissipation frame via a limiting groove, which is used to adjust the movable bracket up and down.

9. A three-phase five-limb rectifier transformer employing a cross-type coil according to claim 8, characterized in that, The inner end of the movable bracket is provided with sponge wipes at equal intervals, and the outer surface of the sponge wipes is attached to the outer surface of the heat dissipation fin body.

10. A three-phase five-limb rectifier transformer employing a cross-type coil according to claim 9, characterized in that, The heat dissipation fin body has a through-type flow guide groove on the inner side, and the upper and lower sides of the flow guide groove are provided with flow guide holes located inside the heat dissipation fin body. The inner side of the guide hole is arc-shaped, and the guide hole is inclined.

Images