Transformer iron core with good heat dissipation performance

Abstract

The invention relates to the technical field, and discloses a transformer iron core with good heat dissipation performance, which comprises a transformation winding, and is characterized by further comprising a laminated iron core, an insulation clamping plate, a fixing clamping piece and a connecting rib, the insulation clamping plate comprises a top plate, the bottom end of the long edge of one side of the top plate is fixedly connected with a side plate I, sliding grooves are formed in the two ends of the top plate, and the side plate I is fixedly connected with a side plate II; the insulating clamping plates are arranged between the iron core and the clamping pieces, on one hand, the side plates on the two sides clamp the iron core lamination pieces to prevent the iron core lamination pieces from being warped, on the other hand, contact between the clamping pieces and the iron core lamination pieces is isolated, multipoint grounding is avoided, and the probability of local overheating caused by faults in the transformer can be reduced; and meanwhile, the long strips and the square windows are uniformly arranged in the insulating clamping plates, so that a path for the insulating oil to flow through the laminated iron core is created, the laminated iron core and the insulating oil in the transformer have a larger contact area, and better heat dissipation of the laminated iron core is facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of transformer core heat dissipation, and more specifically to a transformer core with good heat dissipation performance. Background Art

[0002] An oil-immersed transformer generally consists of a core, windings, an oil tank (which is also the outer shell of the transformer) and protection devices. Among them, the core is the main magnetic circuit part of the transformer, usually made of hot-rolled or cold-rolled silicon steel sheets with a relatively high silicon content and an insulating paint coated on the surface. The windings are sleeved on the core, and the two form a complete electromagnetic induction system. When the transformer is operating normally, the core and the clamping parts must be grounded at one point. Otherwise, the floating voltage of the core and the clamping parts to the ground will cause intermittent continuous breakdown discharge to the ground. When there are two or more grounding points on the core and the clamping parts, a closed loop will be formed between the grounding points. It will link part of the magnetic flux, induce electromotive force, and form a loop, resulting in local overheating and even burning out the core. Therefore, the core has and must have only one grounding point; In actual work, the process of multiple grounding includes that due to the fact that the limb plates of the core clamping parts are too close to the core column, and after the core laminations are warped for some reason and touch the limb plates of the clamping parts, multiple grounding is formed. Subsequently, a closed loop is formed between the grounding points, causing local overheating. In order to avoid multiple grounding caused by this reason and subsequent local overheating phenomena, now we need to propose a transformer core with good heat dissipation performance to solve the above problems. Summary of the Invention

[0003] In order to overcome the above-mentioned defects of the prior art, the present invention provides a transformer core with good heat dissipation performance to solve the problems existing in the above-mentioned background art.

[0004] To achieve the above object, the present invention provides the following technical solution: A transformer core with good heat dissipation performance, including a transformer winding, further including: a laminated core, an insulating clamping plate, a fixing clamp, and a connecting rib. The transformer winding is sleeved on the core column of the laminated core. The upper edge and the lower edge of the laminated core are fixedly connected with insulating clamping plates. Fixing clamps are clamped on both sides of the insulating clamping plates. The insulating clamping plates and the fixing clamps are symmetrically arranged about the horizontal center line of the laminated core in upper and lower parts. The upper and lower parts of the fixing clamp are fixedly connected by a connecting rib. The insulating clamping plate includes a top plate. One long side bottom end of the top plate is fixedly connected with a first side plate. Through grooves are opened at both ends of the top plate. Sliders are movably connected inside the through grooves. The bottom ends of the sliders are fixedly connected with a second side plate. Adjusting components are fixedly connected above the through grooves covering both ends of the top plate. The outer side surface of the first side plate is attached to the inner wall in the vertical direction of the adjusting component. A through threaded hole is opened on the side of the adjusting component close to the second side plate. A first lead screw is movably connected inside the threaded hole. The first lead screw is used to push the second side plate to change the distance between it and the first side plate. A gasket is arranged at the corresponding position where the second side plate contacts the first lead screw.

[0005] Further, through square windows are uniformly opened at the top end of the top plate. Long strips arranged in an array are fixedly connected to the opposite side surfaces of the first side plate and the second side plate. The long strips are used to create a gap between the laminated core and the first side plate and the second side plate, so that the laminated core and the insulating oil inside the transformer have a larger contact area. The top plate is used to fix and connect the first side plate, the second side plate, and the adjusting component. The existence of the square windows creates a path for the insulating oil to flow through the laminated core and further increases the contact area between the two.

[0006] Further, the laminated core includes an upper yoke and a lower yoke fixedly connected with the insulating clamping plate, and a core column between the upper yoke and the lower yoke. An insulating paper tube, a low-voltage winding, an insulating separation layer, a high-voltage winding, and a second insulating paper are sequentially sleeved on the outer side of the core column. The insulating separation layer is composed of radial spacer strips and insulating paper I wrapped on the outside of them, and is used to provide an appropriate gap between the low-voltage winding and the high-voltage winding, allowing the insulating oil to pass through the two and cooling them.

[0007] Further, one end of a silicon steel lamination in the middle of the upper yoke extends out a connecting piece. A first wire is fixedly connected to the side surface of the connecting piece. The first wire passes through the square window and is led out of the transformer shell through a sleeve by a fixing plate fixedly connected to the inner edge of the square window.

[0008] Further, a clamping member is clamped between the outer sides of the first side plate and the second side plate. The top end of the clamping member is attached to the bottom end of the adjusting assembly, and a spacer block is provided between its bottom end and the top end of the transformer winding. The two clamping members on both sides are fixedly connected by a reinforcing rib assembly. The reinforcing rib assembly includes a second screw rod penetrating through the side wall of the clamping member, a torsion nut fixedly connected to one end of the second screw rod, and a first nut threadedly connected to the other end. Passing the second screw rod through the side wall of one clamping member and penetrating the side wall of the other clamping member, and screwing the first nut inward from the end will cause the two clamping members to close and clamp the first side plate, the second side plate and the upper yoke inside them.

[0009] Further, a lifting ring is fixedly connected to the top end of the clamping member. The lifting rings are symmetrically arranged at the top end of the clamping member with respect to the midline parallel to the short side of the clamping member, and holes are provided on its side surface for facilitating the fixed connection between the clamping member and the top shell of the transformer.

[0010] Further, a bent plate is fixedly connected to the top end of the clamping member by screws. An elliptical opening is provided at the top end of the bent plate, and a screw rod with a metal round pad at one end passes through the inside. The screw rod is fixedly connected to the bent plate by threadedly connecting a second nut. The top end of the screw rod is fixedly connected to a second wire. The second wire also leads out of the transformer shell through a sleeve. The second wire does not contact the first wire and the sleeve leading out the two.

[0011] Further, the upper part and the lower part of the fixed clamping member are fixedly connected by equidistantly distributed long ribs and short ribs. The long ribs penetrate the top end of the upper clamping member and the bottom end of the lower clamping member, and are tightened at both ends by a third nut. The short ribs penetrate the bottom end of the upper clamping member and the top end of the lower clamping member, and are tightened at both ends by a fourth nut.

[0012] Technical effects and advantages of the present invention: 1. By providing an insulating clamping plate between the iron core and the clamping member, on the one hand, the two side plates clamp the iron core laminations to prevent them from warping, and on the other hand, the contact between the clamping member and the iron core laminations is isolated to avoid forming multiple grounding points, which is beneficial to reducing the probability of local overheating caused by internal faults in the transformer.

[0013] 2. By providing uniformly arranged long strips and square windows inside the insulating clamping plate, a path for insulating oil to flow through the laminated iron core is created and the laminated iron core has a larger contact area with the insulating oil inside the transformer, which is beneficial to helping the laminated iron core dissipate heat better.

[0014] 3. By providing a fixing plate on the top plate of the insulating clamping plate, the grounding wire led out from the iron core laminations is fixed, and one end of the iron core is grounded by leading it out of the shell through a sleeve, avoiding accidental contact between the iron core and the clamping plate of the fixed clamping member, which is beneficial to reducing the possibility of multiple grounding inside the transformer. Description of the drawings

[0015] Figure 1 is a schematic diagram of the overall external structure of the present invention; Figure 2 is a schematic diagram of the overall cross-sectional structure of the present invention; Figure 3 is a schematic diagram of the split structure of the insulating clamping plate of the present invention; Figure 4 is a schematic diagram of the side structure of the insulating clamping plate of the present invention; Figure 5 is a schematic diagram of the cross-sectional structure of the transformer winding of the present invention; Figure 6 is a schematic diagram of the side view structure of the whole of the present invention; Figure 7 is a schematic diagram of the structure of the grounding wire of the clamping member of the present invention.

[0016] The reference signs are: 1, transformer winding; 101, insulating paper tube; 102, low-voltage winding; 103, insulating separation layer; 1031, spacer bar; 1032, insulating paper one; 104, high-voltage winding; 105, insulating paper two; 2, laminated iron core; 201, upper yoke; 202, lower yoke; 203, core column; 204, connecting piece; 205, wire one; 3, insulating clamping plate; 301, top plate; 3011, square window; 3012, fixing plate; 302, side plate one; 3021, long strip; 303, sliding groove; 304, slider; 305, side plate two; 306, adjusting component; 307, threaded hole; 308, lead screw one; 309, gasket; 4, fixing clamp; 401, clamping member; 402, cushion block; 403, reinforcing rib component; 4031, lead screw two; 4032, turning nut; 4033, nut one; 404, lifting ring; 405, screw; 406, bent plate; 407, screw rod; 408, nut two; 409, wire two; 5, connecting rib; 501, long rib; 5011, nut three; 502, short rib; 5021, nut four. Detailed implementation manners

[0017] Next, the technical solutions in the present invention will be clearly and completely described in conjunction with the accompanying drawings in the present invention. In addition, the forms of the various structures described in the following embodiments are merely examples, and a transformer core with good heat dissipation involved in the present invention is not limited to the various structures described in the following embodiments. All other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0018] Refer to Figures 1 to 3, the present invention provides a transformer core with good heat dissipation performance, including a transformer winding 1, and further including: a laminated core 2, an insulating clamping plate 3, a fixing clamp 4, and a connecting rib 5. The transformer winding 1 is sleeved on the core column 203 of the laminated core 2. The upper and lower edges of the laminated core 2 are fixedly connected with an insulating clamping plate 3. Fixing clamps 4 are clamped on both sides of the insulating clamping plate 3. Both the insulating clamping plate 3 and the fixing clamp 4 are symmetrically arranged in upper and lower parts with respect to the horizontal center line of the laminated core 2. The upper and lower parts of the fixing clamp 4 are fixedly connected through a connecting rib 5; The insulating clamping plate 3 includes a top plate 301. One long side bottom end of the top plate 301 is fixedly connected with a first side plate 302. Through grooves 303 are opened at both ends of the top plate 301. Sliders 304 are movably connected inside the through grooves 303. The bottom end of the slider 304 is fixedly connected with a second side plate 305. Adjusting components 306 are fixedly connected above the through grooves 303 covering both ends of the top plate 301. The outer side surface of the first side plate 302 is attached to the inner wall in the vertical direction of the adjusting component 306. A through threaded hole 307 is opened on the side of the adjusting component 306 close to the second side plate 305. A first lead screw 308 is movably connected inside the threaded hole 307. The first lead screw 308 is used to push the second side plate 305 to change the distance between it and the first side plate 302. A gasket 309 is arranged at the corresponding position of the second side plate 305 in contact with the first lead screw 308.

[0019] Among them, through square windows 3011 are uniformly opened at the top end of the top plate 301. Long strips 3021 arranged in an array are fixedly connected to the opposite sides of the first side plate 302 and the second side plate 305 facing each other. The long strips 3021 are used to create a gap between the laminated core 2 and the first side plate 302 and the second side plate 305, so that the laminated core 2 has a larger contact area with the insulating oil inside the transformer. The top plate 301 is used to fix and connect the first side plate 302, the second side plate 305, and the adjusting component 306. The existence of the square windows 3011 creates a path for the insulating oil to flow through the laminated core 2 and further increases the contact area between the two, helping the laminated core 2 to dissipate heat.

[0020] In the above description, the component parts of the insulating clamping plate 3, that is, the parts directly in contact with the laminated core 2 such as the top plate 301, the first side plate 302, the second side plate 305, and the long strips 3021, are all made of wood with excellent insulation performance. This wood is forged by a high-temperature and high-pressure process and has high mechanical strength and electrical strength, isolating the contact between the laminated core 2 and the fixing clamp 4, providing a good guarantee for avoiding multi-point grounding.

[0021] Refer to Figures 2 to 7, wherein the laminated iron core 2 includes an upper yoke 201 and a lower yoke 202 fixedly connected to an insulating clamping plate 3, and a core column 203 between the upper yoke 201 and the lower yoke 202. An insulating paper tube 101, a low-voltage winding 102, an insulating separation layer 103, a high-voltage winding 104, and a second insulating paper 105 are sequentially sleeved on the outer side of the core column 203. The insulating separation layer 103 is composed of a radial spacer 1031 and an insulating paper 1032 wrapped on its outer side, and is used to provide an appropriate gap between the low-voltage winding 102 and the high-voltage winding 104, allowing insulating oil to pass through the two and cooling them.

[0022] Wherein, one silicon steel lamination in the middle of the upper yoke 201 extends a connecting piece 204 at one end. A first wire 205 is fixedly connected to the side surface of the connecting piece 204. The first wire 205 passes through the square window 3011 and is led out of the transformer casing through a fixing plate 3012 fixedly connected to its inner edge, realizing grounding of one end of the laminated iron core 2.

[0023] Wherein, a clamping member 401 is clamped between the outer sides of the first side plate 302 and the second side plate 305. The top end of the clamping member 401 fits against the bottom end of the adjusting assembly 306. A spacer 402 is provided between its bottom end and the top end of the transformer winding 1, separating the fixing clamp members 4 from the laminated iron core 2 and the transformer winding 2 respectively, reducing the possibility of multi-point grounding caused by contact due to laminated deformation and resulting in local overheating. The two clamping members 401 on both sides are fixedly connected by a reinforcing rib assembly 403. The reinforcing rib assembly 403 includes a second screw rod 4031 passing through the side wall of the clamping member 401, a torsion cap 4032 fixedly connected to one end of the second screw rod 4031, and a first nut 4033 threadedly connected to the other end. Passing the second screw rod 4031 through the side wall of one clamping member 401 and through the side wall of the other clamping member 401, and screwing the first nut 4033 inward from the end will cause the two clamping members 401 to close and clamp the first side plate 302 and the second side plate 305 and the upper yoke 201 inside them.

[0024] Wherein, a lifting ring 404 is also fixedly connected to the top end of the clamping member 401. The lifting ring 404 is symmetrically arranged at the top end of the clamping member 401 with respect to the midline parallel to the short side of the clamping member 401, and a hole is provided on its side surface, facilitating the fixed connection between the clamping member 401 and the top shell of the transformer.

[0025] Among them, the top end of the clamping member 401 is fixedly connected with a bent plate 406 through a screw 405. An elliptical opening is provided at the top end of the bent plate 406, and a screw rod 407 with a metal round pad at one end passes through the inside. The screw rod 407 is fixedly connected with the bent plate 406 through a second nut 408 connected by threads. The top end of the screw rod 407 is fixedly connected with a second wire 409. The second wire 409 is also led out of the transformer casing through a sleeve, realizing that one end of the fixed clamping member 4 is grounded. It should be noted that the second wire 409 does not contact the first wire 205 and the sleeve leading them out. In this way, a circulating current will be formed in the loop of "laminated iron core - iron core grounding point - conducting belt - clamping member grounding point - fixed clamping member", which is beneficial to detecting the current inside the transformer.

[0026] Among them, the upper part and the lower part of the fixed clamping member 4 are fixedly connected through equally spaced long ribs 501 and short ribs 502. The long rib 501 penetrates the top end and the bottom end of the upper clamping member 401, and both ends are tightened by a third nut 5011. The short rib 502 penetrates the bottom end and the top end of the upper clamping member 401, and both ends are tightened by a fourth nut 5021.

[0027] The working principle of the present invention: After the transformer winding 1 is sleeved on the core column 203, the upper edge and the lower edge of the laminated iron core 2 are respectively placed between the first side plate 302 and the second side plate 305 of the corresponding insulating clamping plate 3. The nut on the first screw rod 308 is screwed, so that the first screw rod 308 is screwed inwards. The second side plate 305 is subjected to the thrust of the first screw rod 308, and moves along the sliding groove 303 through the slider 304 fixedly connected to its top in the direction perpendicular to the first side plate 302 of the top plate 301, that is, the action of the second side plate 305 pushing towards the first side plate 302 is realized. Among them, the gasket 309 blocks the damage of the end of the first screw rod 308 to the second side plate 305, increasing the durability of the insulating clamping plate 3.

[0028] After the transformer winding 1 is sleeved on the laminated iron core 2 and the installation of the insulating clamping plate 3 is completed, the fixed clamping member 4 is installed on the outside of the above combination. First, the assembly of the two upper clamping members 401 is carried out. The clamping members 401 are respectively attached to the first side plate 302 and the second side plate 305 of the insulating clamping plate 3 from both sides. The upper edge of the clamping member 401 is attached to the bottom end of the adjusting assembly 306, and a spacer 402 is padded between the lower end and the top end of the transformer winding 1. Then, the reinforcing rib assembly 403 is installed at the head and tail of the two clamping members 401. The second screw rod 4031 is passed through the side wall of one clamping member 401 and penetrates the side wall of the other clamping member 401 until the torsion cap 4032 at the end of the second screw rod 4031 fits the inner wall of the clamping member 401. The first nut 4033 is tightened from the inside of the other clamping member 401, and the assembly of the upper clamping member 401 can be completed. The lower part is installed in the same steps.

[0029] After the installation of the upper and lower clamping members 401 of the fixed clamping member 4, the assembly integrity and stability of the transformer core are further enhanced by connecting the two. Long ribs 501 are installed at the four ends of the upper and lower clamping members 401, and short ribs 502 are installed in the middle of the clamping members 401 on the same side of the upper and lower parts. The two ends are tightened with nuts. The above steps complete this embodiment, that is, the assembly of a transformer core with good heat dissipation. By adding an insulating clamping plate 3 to the traditional structure, on the basis of isolating the core from the clamping member to avoid multi-point grounding, the contact area between the core and the insulating oil is retained and increased, thereby increasing heat dissipation.

[0030] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A transformer core with good heat dissipation, comprising a transformer winding (1), characterized in that: Also includes: A laminated iron core (2), an insulating clamp (3), a fixing clamp (4), and a connecting rib (5), wherein the transformer winding (1) is sleeved on a core column (203) of the laminated iron core (2), the upper and lower edges of the laminated iron core (2) are fixedly connected to the insulating clamp (3), and fixing clamps (4) are clamped on both sides of the insulating clamp (3), and the insulating clamp (3) and the fixing clamp (4) are both symmetrically arranged with upper and lower parts about the horizontal center line of the laminated iron core (2), and the upper and lower parts of the fixing clamp (4) are fixedly connected by the connecting rib (5), and the insulating clamp (3) comprises a top plate (301), and the bottom end of one long side of the top plate (301) is fixedly connected to a side plate (302), and two ends of the top plate (301) are provided with slide grooves (303), and the slide grooves (303) ) is movably connected to a slider (304) inside, the bottom end of the slider (304) is fixedly connected to the side plate 2 (305), the two ends of the top plate (301) are covered above the slide groove (303) and are fixedly connected to an adjustment component (306), the outer side surface of the side plate 1 (302) is in contact with the inner wall of the adjustment component (306) in the vertical direction, the adjustment component (306) is provided with a through threaded hole (307) on the side close to the side plate 2 (305), the threaded hole (307) is movably connected to the inside of the screw rod 1 (308), the screw rod 1 (308) is used to push the side plate 2 (305) to change the distance between it and the side plate 1 (302), and the side plate 2 (305) is provided with a gasket (309) at the corresponding position of the contact with the screw rod 1 (308).

2. The transformer core with good heat dissipation according to claim 1, characterized in that: The top of the top plate (301) is evenly provided with through square windows (3011), and the sides of the side plates (302) and (305) facing each other are fixedly connected with long strips (3021) arranged in an array, wherein the long strips (3021) are used to create gaps between the laminated core (2) and the side plates (302) and (305), so that the laminated core (2) and the insulating oil inside the transformer have a larger contact area, wherein the top plate (301) is used to fix and connect the side plates (302), (305) and the adjustment component (306), and the existence of the square windows (3011) creates a path for the insulating oil to flow through the laminated core (2) and further increases the contact area between the two.

3. The transformer core with good heat dissipation according to claim 2, characterized in that: The laminated iron core (2) comprises an upper iron yoke (201) and a lower iron yoke (202) fixedly connected to an insulating clamping plate (3), and a core column (203) between the upper iron yoke (201) and the lower iron yoke (202); the outer side of the core column (203) is sequentially sleeved with an insulating paper tube (101), a low-voltage winding (102), an insulating separation layer (103), a high-voltage winding (104) and insulating paper 2 (105); the insulating separation layer (103) is composed of radial pads (1031) and insulating paper 1 (1032) wrapped on the outer side thereof, and is used to provide an appropriate gap between the low-voltage winding (102) and the high-voltage winding (104), allowing insulating oil to pass through the two and cool them.

4. The transformer core with good heat dissipation according to claim 3, characterized in that: A connecting piece (204) extends from one end of a silicon steel laminate in the middle of the upper iron yoke (201), and a conductor 1 (205) is fixedly connected to the side of the connecting piece (204). The conductor 1 (205) passes through the square window (3011) and is led out of the transformer housing through a fixing plate (3012) fixedly connected to the inner edge thereof through a bushing.

5. The transformer core with good heat dissipation according to claim 1, characterized in that: A clamping piece (401) is clamped on the outer side of the side plate 1 (302) and the side plate 2 (305); the top end of the clamping piece (401) is attached to the bottom end of the adjustment component (306); a cushion block (402) is provided between the bottom end and the top end of the transformer winding (1); the clamping pieces (401) on both sides are fixedly connected by a reinforcing rib component (403); the reinforcing rib component (403) comprises a screw rod 2 (403) penetrating through the side wall of the clamping piece (401); 1) A torsion cap (4032) is fixedly connected to one end of the second screw rod (4031) and a nut (4033) is threadedly connected to the other end thereof. The second screw rod (4031) is passed through the side wall of the clamping member (401) on one side and penetrates the side wall of the clamping member (401) on the other side. The nut (4033) is screwed inward from the end, so that the two clamping members (401) are retracted and the side plate (302) and the side plate (305) and the upper iron yoke (201) therein are clamped.

6. The transformer core with good heat dissipation according to claim 5, characterized in that: The top end of the clamping member (401) is also fixedly connected to a lifting ring (404), which is symmetrically arranged at the top end of the clamping member (401) about a midline parallel to the short side of the clamping member (401), and has a hole on its side to facilitate fixed connection between the clamping member (401) and the shell at the top end of the transformer.

7. The transformer core with good heat dissipation according to claim 5, characterized in that: The top end of the clamping member (401) is fixedly connected to a bent plate (406) via a screw (405); the top end of the bent plate (406) is provided with an elliptical opening, through which a screw (407) with a metal round washer at one end passes; the screw (407) is fixedly connected to the bent plate (406) via a nut (408) threadedly connected; the top end of the screw (407) is fixedly connected to a second conductor (409); the second conductor (409) is also led out of the transformer housing via a bushing; the second conductor (409) does not contact the first conductor (205) and the bushing leading out the two.

8. The transformer core with good heat dissipation according to claim 1, characterized in that: The upper and lower parts of the fixing clamp (4) are fixedly connected by long ribs (501) and short ribs (502) that are evenly distributed, wherein the long rib (501) passes through the top end of the upper clamp (401) and the bottom end of the lower clamp (401), and the two ends are tightened by nuts three (5011), and the short rib (502) passes through the bottom end of the upper clamp (401) and the top end of the lower clamp (401), and the two ends are tightened by nuts four (5021).

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