A step-down power transformer for distribution network

Abstract

This utility model provides a step-down power transformer for distribution networks, belonging to the field of transformers. Its key technical features include a main structure comprising a housing, an internal battery cell, and windings uniformly fixed to the outer sides of the battery cell. A cover plate is provided on the top of the housing, and a flange is fixedly connected to the top edge of the housing. Multiple fixing bolts are uniformly threaded between the cover plate and the flange. A fixing structure includes L-shaped limiting plates at the four corners of the battery cell, side plates on both sides of the battery cell, and support plates abutting the bottom of the two lower sets of L-shaped limiting plates. Both sets of support plates are fixedly connected to the inner wall of the housing. Threaded rods are symmetrically fixed to the top of the two sets of L-shaped limiting plates on both sides. This utility model aims to provide a step-down power transformer for distribution networks, improving the efficiency of battery cell and winding maintenance and replacement.

Description

Technical Field

[0001] This utility model relates to the field of transformers, specifically a step-down power transformer for distribution networks. Background Technology

[0002] A transformer is a device that uses the principle of electromagnetic induction to change alternating current voltage. Its main components are the primary coil, secondary coil, and iron core. In electrical equipment and wireless circuits, it is commonly used for voltage step-up / step-down, impedance matching, and safety isolation. In generators, whether the coil moves through a magnetic field or the magnetic field moves through a stationary coil, an electromotive force is induced in the coil. A transformer is a device that uses electromagnetic induction to transform voltage, current, and impedance. Oil-immersed transformers use transformer oil as an insulating and cooling medium and achieve voltage conversion through the principle of electromagnetic induction. They are widely used in power supply and distribution systems in industrial and mining enterprises and civil buildings.

[0003] In traditional oil-immersed transformers, the core is fixed inside the casing and completely submerged in transformer oil. When a winding or core malfunctions and requires repair or replacement, the transformer oil inside the casing must be completely drained before the core and windings can be disassembled for repair. After repair, transformer oil must be refilled. This repair process is not only cumbersome but also significantly reduces repair efficiency. Utility Model Content

[0004] The purpose of this invention is to provide a step-down power transformer for distribution networks to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A step-down power transformer for distribution networks, comprising:

[0007] The main structure includes a shell, inside which a battery cell is provided, and windings are uniformly fixed on the outside of the battery cell. A cover plate is provided on the top of the shell, and a flange is fixedly connected to the top edge of the shell. Multiple fixing bolts are uniformly threaded between the cover plate and the flange.

[0008] The fixed structure includes L-shaped limiting plates disposed at the four corners of the battery cell. Side plates are provided on both sides of the battery cell. The bottom of the two sets of L-shaped limiting plates on the lower side abuts against a support plate. Both sets of support plates are fixedly connected to the inner wall of the housing. Threaded rods are symmetrically fixedly connected to the top of the two sets of L-shaped limiting plates on both sides. The threaded rods penetrate the L-shaped limiting plates. Limiting nuts are threadedly connected to the outer side of each set of threaded rods. Lifting rings are symmetrically fixedly connected to the top of the two sets of L-shaped limiting plates on the upper side. Pressure blocks are symmetrically fixedly connected to both sides of the bottom of the cover plate. The pressure blocks on both sides abut against the two sets of L-shaped limiting plates on the upper side, respectively.

[0009] As a further embodiment of this utility model: the two sets of upper side plates are fixedly connected to the two sets of upper L-shaped limiting plates, and the two sets of lower side plates are fixedly connected to the two sets of lower L-shaped limiting plates.

[0010] As a further embodiment of this utility model: a sealing ring is fixedly connected to the top of the flange, and the sealing ring abuts against the cover plate.

[0011] As a further embodiment of this utility model: channel steel is symmetrically fixedly connected to the bottom of the shell, and multiple fins are uniformly fixedly connected to the outer side of the shell.

[0012] As a further embodiment of this utility model: an extension plate is fixedly connected to the opposite sides of the L-shaped limiting plates on both sides, and a guide rod slides through the interior of each of the extension plates on both sides, and each set of guide rods is fixedly connected to the housing.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] With the above-described structure, this invention, through the cooperation of the L-shaped limiting plate, guide rod, lifting ring, and pressure block, allows the cover plate to be opened after the fixing bolts are unscrewed, stopping the pressure block from limiting the top L-shaped limiting plate. Then, a lifting tool can be used to lift the lifting ring, L-shaped limiting plate, battery cell, and windings out of the housing for maintenance. After maintenance, the lifting ring, L-shaped limiting plate, battery cell, and windings can be lifted back into the housing, eliminating the need to drain the transformer oil from the housing during battery cell and winding maintenance and replacement, thus effectively improving the efficiency of battery cell and winding maintenance and replacement. Attached Figure Description

[0015] The present invention will be further described in detail below with reference to the embodiments shown in the accompanying drawings, but this does not constitute any limitation on the present invention.

[0016] Figure 1 This is a structural cross-sectional view of a step-down power transformer used in power distribution networks.

[0017] Figure 2 A step-down power transformer for distribution networks Figure 1 A schematic diagram of the structure of part A.

[0018] Figure 3 A step-down power transformer for distribution networks Figure 1 A schematic diagram of the structure of part B.

[0019] In the diagram: 1. Main structure; 101. Shell; 102. Channel steel; 103. Cover plate; 104. Flange; 105. Fixing bolt; 106. Battery cell; 107. Winding; 108. Sealing ring; 109. Fin; 2. Fixing structure; 201. L-shaped limiting plate; 202. Threaded rod; 203. Side plate; 204. Support plate; 205. Limiting nut; 207. Extension plate; 208. Guide rod; 209. Pressure block; 210. Lifting ring. Detailed Implementation

[0020] The technical solution of this patent will be further described in detail below with reference to specific embodiments.

[0021] Please see Figure 1-3 A step-down power transformer for distribution networks includes a main structure 1, which includes a housing 101. Channel steel 102 is symmetrically fixedly connected to the bottom of the housing 101, providing support for the housing 101. Inside the housing 101 are battery cells 106, and windings 107 are uniformly fixed to the outer sides of the battery cells 106. The housing 101 is configured to accommodate the battery cells 106, windings 107, and transformer oil. A cover plate 103 is provided on the top of the housing 101, and a flange 104 is fixedly connected to the top edge of the housing 101. Multiple fixing bolts 105 are uniformly threaded between the cover plate 103 and the flange 104, covering the top of the housing 101.

[0022] A sealing ring 108 is fixedly connected to the top of flange 104, and the sealing ring 108 abuts against cover plate 103. The sealing ring 108 seals the gap between cover plate 103 and flange 104. Multiple fins 109 are evenly fixedly connected to the outer side of housing 101, facilitating heat dissipation for the entire transformer. Fixing structure 2 includes L-shaped limiting plates 201 located at the four corners of cell 106, which limit the movement of the four corners of winding 107. Side plates 203 are provided on both sides of cell 106. The upper two sets of side plates 203 are fixedly connected to the upper two sets of L-shaped limiting plates 201, and the lower two sets of side plates 203 are fixedly connected to the lower two sets of L-shaped limiting plates 201. The side plates 203 limit the movement of the two sides of winding 107.

[0023] The bottom of each of the two lower L-shaped limiting plates 201 abuts against a support plate 204. Both support plates 204 are fixedly connected to the inner wall of the housing 101. The support plates 204 provide support for the lower L-shaped limiting plates 201. Threaded rods 202 are symmetrically fixedly connected to the top of each of the two sets of L-shaped limiting plates 201 on both sides. The threaded rods 202 penetrate the L-shaped limiting plates 201. A limiting nut 205 is threaded onto the outer side of each threaded rod 202. When the limiting nut 205 rotates, it can drive the upper L-shaped limiting plate 201 downwards, allowing the upper and lower L-shaped limiting plates 201 to press and fix the battery cell 106.

[0024] Extension plates 207 are fixedly connected to the opposite sides of the L-shaped limiting plates 201 on both sides. Guide rods 208 slide through the interior of the extension plates 207 on both sides. Each set of guide rods 208 is fixedly connected to the housing 101. The extension plates 207 and guide rods 208 can guide the up and down movement of the L-shaped limiting plates 201. Lifting rings 210 are symmetrically fixedly connected to the top of the two sets of L-shaped limiting plates 201 on the upper side. The lifting rings 210 can facilitate the lifting and lowering of the L-shaped limiting plates 201. Pressure blocks 209 are symmetrically fixedly connected to both sides of the bottom of the cover plate 103. The pressure blocks 209 on both sides abut against the two sets of L-shaped limiting plates 201 on the upper side respectively. The pressure blocks 209 can press and limit the upper L-shaped limiting plates 201.

[0025] When in use, if the winding 107 or the battery cell 106 is damaged and needs repair or replacement, the fixing bolts 105 of each group can be unscrewed to release the fixing of the cover plate 103. Then, the cover plate 103 can be removed. After that, the hooks of the lifting tool can be used to hook the lifting rings 210 of each group. Then, the lifting tool can be started to lift the lifting rings 210, thereby causing the L-shaped limit plate 201, the battery cell 106 and the winding 107 to move upward, detach from the transformer oil inside the housing 101, and stand for a period of time so that the transformer oil remaining on the battery cell 106 and the winding 107 can drip into the inside of the housing 101. After that, the winding 107 or the battery cell 106 can be repaired or replaced. After the repair is completed, the battery cell 106 and the winding 107 can be lowered back into the inside of the housing 101 by the lifting tool so that the battery cell 106 and the winding 107 are once again immersed in the transformer oil inside the housing 101.

[0026] The above-described embodiments are preferred embodiments of the present utility model and are only used to facilitate the illustration of the present utility model. They are not intended to limit the present utility model in any way. Any person skilled in the art who makes partial modifications or alterations to the technical content disclosed in the present utility model without departing from the scope of the technical features of the present utility model shall still fall within the scope of the technical features of the present utility model.

Claims

1. A step-down power transformer for distribution networks, characterized in that, include The main structure (1) includes a shell (101), inside which a battery cell (106) is provided, and a winding (107) is uniformly fixed on the outside of the battery cell (106). A cover plate (103) is provided on the top of the shell (101), and a flange (104) is fixedly connected to the top edge of the shell (101). Multiple fixing bolts (105) are uniformly threaded between the cover plate (103) and the flange (104). The fixing structure (2) includes L-shaped limiting plates (201) disposed at the four corners of the battery cell (106). Side plates (203) are provided on both sides of the battery cell (106). The bottom of the two sets of L-shaped limiting plates (201) on the lower side abuts against a support plate (204). Both sets of support plates (204) are fixedly connected to the inner wall of the housing (101). The tops of the two sets of L-shaped limiting plates (201) on both sides are symmetrically fixedly connected with threads. The threaded rod (202) passes through the L-shaped limiting plate (201). Each set of threaded rods (202) has a limiting nut (205) threadedly connected to its outer side. The top of the two sets of L-shaped limiting plates (201) on the upper side is symmetrically fixed with a lifting ring (210). The bottom sides of the cover plate (103) are symmetrically fixed with pressure blocks (209). The pressure blocks (209) on both sides abut against the two sets of L-shaped limiting plates (201) on the upper side respectively.

2. A step-down power transformer for distribution networks according to claim 1, characterized in that, The two sets of upper side plates (203) are fixedly connected to the two sets of upper L-shaped limiting plates (201), and the two sets of lower side plates (203) are fixedly connected to the two sets of lower L-shaped limiting plates (201).

3. A step-down power transformer for distribution networks according to claim 1, characterized in that, A sealing ring (108) is fixedly connected to the top of the flange (104), and the sealing ring (108) abuts against the cover plate (103).

4. A step-down power transformer for distribution networks according to claim 1, characterized in that, The bottom of the housing (101) is symmetrically fixedly connected with channel steel (102), and a plurality of fins (109) are uniformly fixedly connected to the outer side of the housing (101).

5. A step-down power transformer for distribution networks according to claim 1, characterized in that, Both sides of the L-shaped limiting plates (201) are fixedly connected to the opposite sides of the extension plates (207), and both sides of the extension plates (207) are slidably connected to the guide rods (208). Each set of guide rods (208) is fixedly connected to the housing (101).

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