A transformer core with good heat dissipation

Abstract

The present invention relates to the technical field and discloses a transformer core with good heat dissipation, including a transformer winding, characterized in that it also includes: a laminated iron core, an insulating splint, a fixing clamp, and a connecting rib, the insulating splint including a top plate, a bottom end of a long side of one side of the top plate is fixedly connected to a side plate, two ends of the top plate are provided with a slide groove, and a slider is movably connected inside the slide groove. By arranging an insulating splint between the iron core and the clamp, on the one hand, the side plates on both sides clamp the iron core laminate to prevent it from warping, and on the other hand, the contact between the clamp and the iron core laminate is isolated to avoid the formation of multi-point grounding, which is beneficial to reducing the probability of local overheating caused by internal faults of the transformer. At the same time, the long strips and square windows evenly arranged inside the insulating splint create a path for insulating oil to flow through the laminated iron core and enable the laminated iron core to have a larger contact area with the insulating oil inside the transformer, which is beneficial to help the laminated iron core to dissipate heat better.

Description

Technical Field

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

[0002] Oil-immersed transformers are usually composed of an iron core, windings, an oil tank (which is also the outer shell of the transformer) and protective devices. The iron core is the main magnetic circuit part of the transformer. It is usually made of hot-rolled or cold-rolled silicon steel sheets with a high silicon content and coated with insulating paint. The windings are set on the iron core, and the two form a complete electromagnetic induction system. When the transformer is operating normally, the iron core and the clamps must be grounded at one point, otherwise the floating voltage of the iron core and the clamps to the ground will cause intermittent and continuous breakdown discharge to the ground. When the iron core and the clamps are grounded at two or more points, a closed loop will be formed between the grounding points, which will chain part of the magnetic flux, induce electromotive force, and form a loop, causing local overheating and even burning the iron core. Therefore, the iron core must be grounded at only one point;

[0003] In actual work, the process of multi-point grounding includes: the core clamp limb is too close to the core column, and the core laminations are tilted for some reason and touch the clamp limb, forming multi-point grounding, and then forming a closed loop between the grounding points, causing local overheating. In order to avoid multi-point grounding and subsequent local overheating caused by this reason, we now need to propose a transformer core with good heat dissipation to solve the above problems. Summary of the Invention

[0004] In order to overcome the above-mentioned defects of the prior art, the present invention provides a transformer core with good heat dissipation to solve the problems existing in the above-mentioned background technology.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solution: a transformer core with good heat dissipation, comprising a transformer winding, and further comprising: a laminated core, an insulating splint, a fixing clamp, and a connecting rib, wherein the transformer winding is sleeved on the core column of the laminated core, the upper and lower edges of the laminated core are fixedly connected with the insulating splint, fixing clamps are clamped on both sides of the insulating splint, the fixing clamps include clamping members, the insulating splint and the fixing clamps are both symmetrically provided with upper and lower parts about the horizontal center line of the laminated core, the upper and lower parts of the fixing clamps are fixedly connected by the connecting rib, the insulating splint includes a top plate, The bottom end of one long side of the top plate is fixedly connected to the side panel one, and a sliding groove is opened at both ends of the top plate, and a slider is movably connected inside the sliding groove, and the bottom end of the slider is fixedly connected to the side panel two, and the two ends of the top plate cover the top of the sliding groove and are fixedly connected to an adjustment component, and the outer side surface of the side panel one is in contact with the inner wall of the adjustment component in the vertical direction. The adjustment component is opened with a threaded hole on the side close to the side panel two, and a screw rod one is movably connected inside the threaded hole, and the screw rod one is used to push the side panel two to change the distance between it and the side panel one, and a gasket is provided at the corresponding position of the side panel two in contact with the screw rod one.

[0006] Furthermore, the top of the top plate is evenly provided with through square windows, and the side surfaces of the side plate one and the side plate two facing each other are fixedly connected with long strips arranged in an array, wherein the long strips are used to create gaps between the laminated core and the side plates one and two, so that the laminated core has a larger contact area with the insulating oil inside the transformer, wherein the top plate is used to fix and connect the side plates one, two and the adjustment assembly, and the presence 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.

[0007] Furthermore, the laminated iron core includes an upper iron yoke and a lower iron yoke fixedly connected to the insulating splint, and a core column between the upper iron yoke and the lower iron yoke. The outer side of the core column is sequentially sleeved with an insulating paper tube, a low-voltage winding, an insulating separation layer, a high-voltage winding and insulating paper 2. The insulating separation layer is composed of radial pads and insulating paper 1 wrapped around its outer side, which is used to provide an appropriate gap between the low-voltage winding and the high-voltage winding, allowing insulating oil to pass through the two and cool them.

[0008] Furthermore, a connecting piece extends from one end of a silicon steel laminate in the middle of the upper iron yoke, and a conductor 1 is fixedly connected to the side of the connecting piece. The conductor 1 passes through the square window and is led out of the transformer casing through the bushing via a fixed plate fixedly connected to its inner edge.

[0009] Furthermore, a clamping piece is provided on the outer side of the side panel 1 and the side panel 2, the top end of the clamping piece is attached to the bottom end of the adjusting assembly, and a pad is provided between the bottom end and the top end of the transformer winding, wherein the clamping pieces on both sides are fixedly connected by a reinforcing rib assembly, and the reinforcing rib assembly includes a screw rod 2 passing through the side wall of the clamping piece, a torsion cap fixedly connected to one end of the screw rod 2 and a nut 1 threadedly connected to the other end thereof, and the screw rod 2 is passed through the side wall of the clamping piece on one side and through the side wall of the clamping piece on the other side, and the nut 1 is screwed inward from the end, which will cause the two clamping pieces to close and clamp the side panel 1 and the side panel 2 and the upper iron yoke inside them.

[0010] Furthermore, a lifting ring is fixedly connected to the top of the clamp, and the lifting ring is symmetrically arranged on the top of the clamp about a midline parallel to the short side of the clamp, and a hole is opened on its side to facilitate the fixed connection between the clamp and the shell at the top of the transformer.

[0011] Furthermore, the top of the clamp is fixedly connected to a bent plate by a screw, the top of the bent plate is provided with an elliptical opening, and a screw with a metal round washer at one end passes through the inside, and the screw is fixedly connected to the bent plate by a nut 2 through a threaded connection, and the top of the screw is fixedly connected to a second conductor, and the second conductor is also led out of the transformer casing by a bushing, and there is no contact between the second conductor and the first conductor and the bushing leading out the two.

[0012] Furthermore, the upper and lower parts of the fixing clamp are fixedly connected by equidistantly distributed long ribs and short ribs, wherein the long ribs pass through the top end of the upper clamp and the bottom end of the lower clamp, and the two ends are tightened by nuts three, and the short ribs pass through the bottom end of the upper clamp and the top end of the lower clamp, and the two ends are tightened by nuts four.

[0013] Technical effects and advantages of the present invention:

[0014] 1. This invention provides insulating plates between the core and the clamps. These plates clamp the core laminations to prevent them from warping, while also isolating the clamps from contacting the core laminations to avoid multiple grounding points. This helps reduce the probability of local overheating caused by internal transformer faults.

[0015] 2. This invention provides a path for the insulating oil to flow through the laminated core by providing evenly arranged strips and square windows inside the insulating splint. This increases the contact area between the laminated core and the insulating oil inside the transformer, which helps to better dissipate heat from the laminated core.

[0016] 3. This invention provides a fixing plate on the top plate of the insulating clamp to secure the grounding wire leading from the core laminations. This wire is then led out of the casing through a bushing to achieve grounding at one end of the core. This prevents accidental contact between the core and the clamping plate of the fixing clamp, thus reducing the possibility of multiple grounding points within the transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall appearance structure of the present invention;

[0018] Figure 2 It is a schematic diagram of the overall cross-sectional structure of the present invention;

[0019] Figure 3 This is a schematic diagram of the split structure of the insulating splint of the present invention;

[0020] Figure 4 This is a schematic side structural diagram of the insulating splint of the present invention;

[0021] Figure 5 It is a schematic diagram of the cross-sectional structure of the transformer winding of the present invention;

[0022] Figure 6 It is a schematic side view of the overall structure of the present invention;

[0023] Figure 7 It is a structural schematic diagram of the grounding wire of the clamping member of the present invention.

[0024] The accompanying drawings are marked as follows: 1. transformer winding; 101. insulating paper tube; 102. low-voltage winding; 103. insulating separation layer; 1031. pad; 1032. insulating paper 1; 104. high-voltage winding; 105. insulating paper 2; 2. laminated core; 201. upper iron yoke; 202. lower iron yoke; 203. core column; 204. connecting piece; 205. conductor 1; 3. insulating splint; 301. top plate; 3011. square window; 3012. fixing plate; 302. side plate 1; 3021. long strip; 303. slide; 304. slide Block; 305, side panel two; 306, adjustment assembly; 307, threaded hole; 308, screw rod one; 309, gasket; 4, fixing clamp; 401, clamping part; 402, spacer; 403, reinforcement rib assembly; 4031, screw rod two; 4032, twist cap; 4033, nut one; 404, lifting ring; 405, screw; 406, bent plate; 407, screw; 408, nut two; 409, wire two; 5, connecting rib; 501, long rib; 5011, nut three; 502, short rib; 5021, nut four. DETAILED DESCRIPTION

[0025] The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the present invention. In addition, the forms of the various structures described in the following embodiments are merely examples. The 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 ordinary technicians in this field without making creative work fall within the scope of protection of the present invention.

[0026] Reference Figures 1 to 3 The present invention provides a transformer core with good heat dissipation, including a transformer winding 1, and further comprising: a laminated core 2, an insulating clamp 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 insulating clamp 3 is fixedly connected to the upper and lower edges of the laminated core 2, the fixing clamp 4 is clamped on both sides of the insulating clamp 3, the fixing clamp 4 includes a clamping member 401, 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 core 2, and the upper and lower parts of the fixing clamp 4 are fixedly connected by the connecting rib 5;

[0027] The insulating splint 3 includes a top plate 301, and the bottom end of one long side of the top plate 301 is fixedly connected to the side plate 1 302, and a sliding groove 303 is provided at both ends of the top plate 301. The sliding groove 303 is movably connected to a slider 304 inside the sliding groove, and the bottom end of the slider 304 is fixedly connected to the side plate 2 305. The two ends of the top plate 301 cover the top of the sliding groove 303 and are fixedly connected to the 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 penetrating threaded hole 307 on the side close to the side plate 2 305, and the threaded hole 307 is movably connected to 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.

[0028] Among them, the top of the top plate 301 is evenly provided with through square windows 3011, and the sides facing each other of the side panel 1 302 and the side panel 2 305 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 panels 1 302 and 305, so that the laminated core 2 has a larger contact area with the insulating oil inside the transformer, wherein the top plate 301 is used to fix and connect the side panels 1 302, 305 and the adjustment assembly 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, thereby helping the laminated core 2 to dissipate heat.

[0029] In the above description, the components of the insulating clamp 3, namely the top plate 301, the side plate 1 302, the side plate 2 305 and the long strip 3021, which are in direct contact with the laminated core 2, are all made of wood with excellent insulating properties. The wood is forged through a high temperature and high pressure process and has high mechanical and electrical strength. It isolates the contact between the laminated core 2 and the fixing clamp 4, providing a good guarantee to avoid the formation of multiple grounding points.

[0030] Reference Figures 2 to 7The laminated core 2 includes an upper iron yoke 201 and a lower iron yoke 202 fixedly connected to the 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 an insulating paper 2 105. The insulating separation layer 103 consists of a radial pad 1031 and an insulating paper 1 1032 wrapped around the outer side thereof, which 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.

[0031] Among them, 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 205 is fixedly connected to the side of the connecting piece 204. The conductor 205 passes through the square window 3011 and is led out of the transformer casing through the fixing plate 3012 fixedly connected to its inner edge, thereby achieving grounding of one end of the laminated core 2.

[0032] Among them, the outer sides of the side panels 1 302 and 2 305 are provided with clamping members 401, the top end of the clamping member 401 is attached to the bottom end of the adjustment assembly 306, and a pad 402 is provided between the bottom end and the top end of the transformer winding 1, isolating the fixing clamp 4 from the laminated core 2 and the transformer winding 2 respectively, reducing the possibility of contact due to deformation of the laminated core, which leads to multiple grounding points and local overheating. The clamping members 401 on both sides are fixedly connected by a reinforcing rib assembly 403, which is strengthened. The reinforcement assembly 403 includes a screw rod 2 4031 that passes through the side wall of the clamping part 401, a twist cap 4032 fixedly connected to one end of the screw rod 2 4031, and a nut 1 4033 threadedly connected to the other end thereof. The screw rod 2 4031 is passed through the side wall of the clamping part 401 on one side and through the side wall of the clamping part 401 on the other side. The nut 1 4033 is screwed inward from the end, which will cause the two clamping parts 401 to retract and clamp the side plate 1 302 and the side plate 2 305 and the upper iron yoke 201 inside them.

[0033] Among them, the top of the clamping member 401 is also fixedly connected to a hanging ring 404, which is symmetrically arranged at the top of the clamping member 401 about the midline parallel to the short side of the clamping member 401, and a hole is opened on its side to facilitate the fixed connection between the clamping member 401 and the shell at the top of the transformer.

[0034] Among them, the top of the clamping member 401 is fixedly connected to the bent plate 406 by a screw 405. The top of the bent plate 406 is provided with an elliptical opening, and a screw 407 with a metal round pad at one end passes through the inside. The screw 407 is threadedly connected to a nut 2 408 to be fixedly connected to the bent plate 406. The top of the screw 407 is fixedly connected to a wire 2 409. The wire 2 409 is also led out of the transformer casing by the bushing to realize grounding of one end of the fixed clamp 4. It is worth noting that there is no contact between the wire 2 409 and the wire 1 205 and the bushing leading out the two. In this way, a circulating current will be formed in the loop of "laminated iron core-iron core grounding point-conductor belt-clamp grounding point-fixed clamp", which is conducive to detecting the internal current of the transformer.

[0035] Among them, the upper and lower parts of the fixing clamp 4 are fixedly connected by equidistantly distributed long ribs 501 and short ribs 502, 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.

[0036] The working principle of the present invention is as follows: after the transformer winding 1 is sleeved on the core column 203, the upper and lower edges of the laminated core 2 are respectively placed between the side plate 1 302 and the side plate 2 305 of the corresponding insulating splint 3, and the nut on the screw rod 1 308 is screwed to make the screw rod 1 308 screw inward. The side plate 2 305 is pushed by the screw rod 1 308, and the slider 304 fixedly connected to its top moves along the slide groove 303 in the direction perpendicular to the side plate 1 302 on the top plate 301, that is, the side plate 2 305 is pushed closer to the side plate 1 302, wherein the gasket 309 prevents the end of the screw rod 1 308 from damaging the side plate 2 305, thereby increasing the durability of the insulating splint 3.

[0037] After the transformer winding 1 is sleeved on the laminated core 2 and the installation of the insulating splint 3 is completed, the fixing clamp 4 is installed on the outside of the above assembly. First, the two upper clamps 401 are assembled, and the clamps 401 are respectively attached to the side plates 1 302 and 2 305 of the insulating splint 3 from both sides, wherein the upper edge of the clamp 401 is attached to the bottom end of the adjustment component 306, and a pad 402 is placed between the lower end and the top of the transformer winding 1. Then, the reinforcing rib assembly 403 is installed at the head and tail of the two clamps 401, and the screw rod 2 4031 is passed through the side wall of the clamp 401 on one side and through the side wall of the clamp 401 on the other side until the twist cap 4032 at the end of the screw rod 2 4031 is attached to the inner wall of the clamp 401, and the nut 1 4033 is tightened from the inside of the clamp 401 on the opposite side to complete the assembly of the upper clamp 401. The lower part is installed using the same steps.

[0038] After the installation of the upper and lower clamping members 401 of the fixing clamp 4 is completed, 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 upper and lower clamping members 401 on the same side. 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 clamp 3 to the traditional structure, the contact area between the core and the insulating oil is retained and increased on the basis of isolating the core and the clamp to avoid multi-point grounding, thereby increasing heat dissipation.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection 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 splint (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 splint (3), the two sides of the insulating splint (3) are clamped with fixing clamps (4), the fixing clamp (4) includes a clamping member (401), the insulating splint (3) and the fixing clamp (4) are both symmetrically provided with upper and lower parts about the horizontal center line of the laminated iron core (2), the upper and lower parts of the fixing clamp (4) are fixedly connected by the connecting rib (5), the insulating splint (3) includes a top plate (301), the bottom end of one long side of the top plate (301) is fixedly connected to a side plate (302), and the two ends of the top plate (301) are provided with a slide groove (301) 3) The slide groove (303) is internally movably connected with a slider (304), the bottom end of the slider (304) is fixedly connected with the side plate 2 (305), the two ends of the top plate (301) cover the top of the slide groove (303) and are fixedly connected with 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 threaded hole (307) passing through the side close to the side plate 2 (305), the threaded hole (307) is internally movably connected with a 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 in contact with the screw rod 1 (308); The top of the top plate (301) is evenly provided with through square windows (3011), and the sides of the side plate 1 (302) and the side plate 2 (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 plate 1 (302) and the side plate 2 (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 plate 1 (302), the side plate 2 (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.

2. The transformer core with good heat dissipation according to claim 1, 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 a second insulating paper (105). The insulating separation layer (103) is composed of a radial pad (1031) and an insulating paper (1032) wrapped around 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.

3. The transformer core with good heat dissipation according to claim 2, characterized in that: A connecting piece (204) extends from one end of a silicon steel lamination 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 the bushing via a fixed plate (3012) fixedly connected to the inner edge of the square window (3011).

4. The transformer core with good heat dissipation according to claim 1, characterized in that: The outer sides of the side plate 1 (302) and the side plate 2 (305) are provided with a clamping member (401), the top end of the clamping member (401) is attached to the bottom end of the adjustment assembly (306), and a pad (402) is provided between the bottom end and the top end of the transformer winding (1), wherein the clamping members (401) on both sides are fixedly connected by a reinforcing rib assembly (403), and the reinforcing rib assembly (403) includes a screw rod 2 (403) penetrating the side wall of the clamping member (401). 1) A twist 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 clamp the side plate (302) and the side plate (305) and the upper iron yoke (201) therein.

5. The transformer core with good heat dissipation according to claim 4, characterized in that: The top end of the clamping member (401) is also fixedly connected to a lifting ring (404), which is symmetrically arranged on the top end of the clamping member (401) about a center line parallel to the short side of the clamping member (401), and has a hole on its side to facilitate the fixed connection between the clamping member (401) and the shell at the top end of the transformer.

6. The transformer core with good heat dissipation according to claim 4, characterized in that: The top of the clamping member (401) is fixedly connected to a bent plate (406) via a screw (405). The top 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) threaded thereon. The top 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) or the bushing leading out the two conductors.

7. 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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