Distribution transformer

Abstract

The utility model relates to a distribution transformer. The technical problem to be solved by the utility model is to provide a distribution transformer. According to the technical scheme, the transformer comprises a transformer iron core, a transformer coil, an upper clamping plate assembly, a lower clamping plate assembly and a clamping plate connecting assembly, and the upper clamping plate assembly comprises a low-voltage side clamping plate, a high-voltage side clamping plate and a high-voltage side clamping plate. The clamping plate connecting assembly comprises two parallel double-thread screws, an inner cushion block, a first supporting spring, a first adjusting pad, a first linkage plate, a second linkage plate, a second supporting spring, a second adjusting pad and a locking nut. The low-voltage side clamping plate and the high-voltage side clamping plate each comprise a clamping plate body attached to the outer side of the transformer iron core. The upper clamping plate assembly has the advantages that the inner cushion block, the supporting spring and the adjusting pad can automatically adjust clamping force according to dynamic changes of thermal expansion and cold contraction of the transformer iron core, axial stress caused by thermal expansion and cold contraction of the transformer iron core is absorbed, and bolts of the upper clamping plate assembly are effectively prevented from loosening.

Description

Technical Field

[0001] This utility model relates to a power distribution transformer. Background Technology

[0002] A distribution transformer includes a transformer core, transformer coils sleeved around the transformer core, an upper clamping plate assembly located at the upper end of the transformer core, and a lower clamping plate assembly located at the lower end of the transformer core. In actual use, existing distribution transformers generate a large amount of heat during operation. Due to the principle of thermal expansion and contraction, the transformer core is subjected to long-term pressure from the transformer core, causing the upper clamping plate assembly to loosen or shift. This leads to a failure in securing the transformer core. Loosening of the transformer core can cause winding displacement or deformation, and in severe cases, magnetic circuit imbalance, resulting in unstable internal operation of the transformer. Therefore, improvements and optimizations are proposed to address this issue. Utility Model Content

[0003] To solve the above problems, the technical problem to be solved by this utility model is to provide a distribution transformer.

[0004] The technical solution adopted by this utility model of a distribution transformer includes: a transformer core, a transformer coil sleeved outside the transformer core, an upper clamping plate assembly located at the upper end of the transformer core, and a lower clamping plate assembly located at the lower end of the transformer core. The upper clamping plate assembly comprises a low-voltage side clamping plate and a high-voltage side clamping plate arranged back-to-back, and a clamping plate connecting assembly. The clamping plate connecting assembly includes two parallel double-ended screws, an inner pad, a first support spring, a first adjusting pad, a first linkage plate and a second linkage plate connecting the two double-ended screws together, a second support spring, a second adjusting pad, and a locking nut. Both the low-voltage side clamping plate and the high-voltage side clamping plate include a clamping plate body that adheres to the outside of the transformer core. The upper end of the clamping plate body is bent vertically outward to form a clamping plate. The reinforcing part of the clamping plate is provided with a clamping plate connecting hole. The inner pad block includes an inner pad block mating part. The side of the inner pad block mating part is provided with a screw through hole. The two sides of the inner pad block mating part are provided with spring positioning grooves between the two screw through holes. The two double-headed screws pass through the first linkage plate, the first adjusting pad, the clamping plate connecting hole of the low-pressure side clamping plate, the first support spring, the screw through hole, the second support spring, the clamping plate connecting hole of the high-pressure side clamping plate, the second adjusting pad, and the second linkage plate in sequence and are then fixed by the locking nut. The first support spring and the second support spring each abut one end in the spring positioning groove and the other end abuts on the clamping plate body.

[0005] Both the first and second adjusting pads have spaced-apart outer shrinkage grooves on their outer walls, and both the first and second adjusting pads have through holes. The inner walls of the through holes have inner shrinkage grooves corresponding to the outer shrinkage grooves.

[0006] The first adjusting pad, the second adjusting pad, and the inner pad block are all made of rubber.

[0007] The inner pad block also includes an inner pad block connecting part, with inner pad block waist-shaped holes at both ends. The clamping plate has clamping plate fixing holes on the reinforcing part. The inner pad block connecting part is positioned above the reinforcing part on the clamping plate. The inner pad block waist-shaped holes and clamping plate fixing holes are connected by screws.

[0008] Both ends of the double-ended screw are threadedly connected to the two locking nuts.

[0009] The advantages of this utility model of distribution transformer are: the inner pad, support spring and adjusting pad can automatically adjust the clamping force according to the dynamic changes of thermal expansion and contraction of the transformer core, absorb the axial stress caused by thermal expansion and contraction of the transformer core, and effectively prevent long-term fatigue of the upper clamping plate assembly and loosening of bolts. Attached Figure Description

[0010] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0011] Figure 1 This is a front view of the distribution transformer of this utility model;

[0012] Figure 2 This is an exploded view of the upper clamping plate assembly of this utility model;

[0013] Figure 3 This is an exploded view of the clamp connection assembly of this utility model;

[0014] Figure 4 This is a schematic diagram of the structure of the inner pad block of this utility model;

[0015] Figure 5 This is a schematic diagram of the structure of the low-pressure side clamp of this utility model;

[0016] Figure 6 This is a schematic diagram of the structure of the first adjusting pad of this utility model. Detailed Implementation

[0017] like Figure 1-6As shown, the distribution transformer of this utility model includes a transformer core 1, a transformer coil 2 sleeved outside the transformer core 1, an upper clamping plate assembly 3 located at the upper end of the transformer core 1, and a lower clamping plate assembly 4 located at the lower end of the transformer core 1. The upper clamping plate assembly 3 includes a low-voltage side clamping plate 6 and a high-voltage side clamping plate 7 arranged back to back, and a clamping plate connecting assembly 8. The clamping plate connecting assembly 8 includes two parallel double-ended screws 10, an inner pad 11, a first support spring 12, a first adjusting pad 13, and a connection between the two double-ended screws 10. The first linkage plate 14 and the second linkage plate 28, the second support spring 29, the second adjusting pad 30, and the locking nut 15 are connected together. The low-voltage side clamping plate 6 and the high-voltage side clamping plate 7 both include a clamping plate body 21 that is attached to the outside of the transformer core 1. The upper end of the clamping plate body 21 is bent vertically outward to form a clamping plate reinforcing part 22. The clamping plate reinforcing part 22 is provided with a clamping plate connecting hole 23. The inner pad block 11 includes an inner pad block mating part 17. The inner pad block mating part 17 is provided with a screw through hole 19 on its side. The inner pad block mating part 17 has screw through holes 19 on both sides. A spring positioning groove 20 is provided between the two screw through holes 19. The two double-ended screws 10 pass through the first linkage plate 14, the first adjusting pad 13, the clamping plate connecting hole 23 of the low-pressure side clamping plate 6, the first support spring 12, the screw through hole 19, the second support spring 29, the clamping plate connecting hole 23 of the high-pressure side clamping plate 7, the second adjusting pad 30, and the second linkage plate 28 in sequence, and are then fixed by the locking nut 15. The first support spring 12 and the second support spring 29 are respectively... One end of each screw abuts against the spring positioning groove 20 and the other end abuts against the clamping plate body 21. The first linkage plate 14 and the second linkage plate 28 make the two double-headed screws 10 form a whole, which has linkage and improves the overall connection strength. The inner pad block 11, the first support spring 12, the first adjusting pad 13, the second support spring 29 and the second adjusting pad 30 can automatically adjust the clamping force according to the dynamic changes of thermal expansion and contraction of the transformer core, absorb the axial stress caused by thermal expansion and contraction of the transformer core, and effectively prevent long-term fatigue of the upper clamping plate assembly and loosening of bolts.

[0018] The outer walls of the first adjusting pad 13 and the second adjusting pad 30 are provided with spaced-apart outer shrinkage grooves 24. The inner walls of the first adjusting pad 13 and the second adjusting pad 30 are provided with adjusting pad through holes 25. The inner walls of the adjusting pad through holes 25 are provided with adjusting pad inner shrinkage grooves 26 corresponding to the outer shrinkage grooves 24. This provides a certain deformation adaptability, realizes automatic compensation of small gaps, and improves the fit and stability of the structure.

[0019] The first adjusting pad 13, the second adjusting pad 30 and the inner pad block 11 are all made of rubber, which can significantly improve the system's impact resistance and vibration reduction performance, making the overall structure more adaptable to the mechanical vibration and thermal shock caused by temperature rise during transformer operation, thereby extending the service life of the transformer.

[0020] The inner pad 11 also includes an inner pad connecting part 18. The inner pad connecting part 18 has inner pad waist-shaped holes 32 at both ends. The clamping plate reinforcing part 22 has clamping plate fixing holes 33. The inner pad connecting part 18 is placed above the clamping plate reinforcing part 22. The inner pad waist-shaped holes 32 and clamping plate fixing holes 33 are connected by screws to reduce the bearing pressure of the weight of the inner pad 11 on the double-ended screw 10.

[0021] Both ends of the double-ended screw 10 are threadedly connected to the two locking nuts 15, further strengthening the connection of the double-ended screw 10.

[0022] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model are included within the protection scope of the present utility model.

Claims

1. A distribution transformer, comprising a transformer core (1), a transformer coil (2) sleeved outside the transformer core (1), an upper clamping plate assembly (3) disposed at the upper end of the transformer core (1), and a lower clamping plate assembly (4) disposed at the lower end of the transformer core (1), characterized in that: The upper clamping plate assembly (3) includes a low-voltage side clamping plate (6) and a high-voltage side clamping plate (7) arranged back to back, and a clamping plate connecting assembly (8). The clamping plate connecting assembly (8) includes two parallel double-headed screws (10), an inner pad (11), a first support spring (12), a first adjusting pad (13), a first linkage plate (14) and a second linkage plate (28) connecting the two double-headed screws (10) together, a second support spring (29), a second adjusting pad (30), and a locking nut (15). The low-voltage side clamping plate (6) and the high-voltage side clamping plate (7) both include a clamping plate body (21) attached to the outside of the transformer core (1). The upper end of the clamping plate body (21) is bent vertically outward to form a clamping plate reinforcing part (22). The clamping plate reinforcing part (22) is provided with a clamping plate connecting hole (23). The inner pad (11) includes an inner pad mating part (1). 7) The inner pad block docking part (17) is provided with a screw through hole (19) on the side. The inner pad block docking part (17) is provided with a spring positioning groove (20) between the two screw through holes (19) on both sides. The two double-headed screws (10) pass through the first linkage plate (14), the first adjusting pad (13), the clamping plate connecting hole (23) of the low-pressure side clamping plate (6), the first support spring (12), the screw through hole (19), the second support spring (29), the clamping plate connecting hole (23) of the high-pressure side clamping plate (7), the second adjusting pad (30) and the second linkage plate (28) respectively, and are then fixed by the locking nut (15). The first support spring (12) and the second support spring (29) each have one end abutting in the spring positioning groove (20) and the other end abutting on the clamping plate body (21).

2. The distribution transformer according to claim 1, characterized in that: The outer walls of the first adjusting pad (13) and the second adjusting pad (30) are provided with spaced adjusting pad outer shrinkage grooves (24), and the inner walls of the first adjusting pad (13) and the second adjusting pad (30) are provided with adjusting pad through holes (25). The inner walls of the adjusting pad through holes (25) are provided with adjusting pad inner shrinkage grooves (26) corresponding to the adjusting pad outer shrinkage grooves (24).

3. The distribution transformer according to claim 1, characterized in that: The first adjusting pad (13), the second adjusting pad (30) and the inner pad block (11) are all made of rubber.

4. The distribution transformer according to claim 1, characterized in that: The inner pad (11) also includes an inner pad connecting part (18), which has inner pad waist-shaped holes (32) at both ends. The clamp plate reinforcement part (22) has clamp plate fixing holes (33). The inner pad connecting part (18) is positioned above the clamp plate reinforcement part (22). The inner pad waist-shaped holes (32) and the clamp plate fixing holes (33) are connected by screws.

5. The distribution transformer according to claim 1, characterized in that: Both ends of the double-ended screw (10) are threadedly connected to the two locking nuts (15).

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