An oil-impervious sealed distribution transformer housing

Abstract

The utility model belongs to power distribution transformer shell field, specifically is a kind of anti-seepage sealing type power distribution transformer shell, including transformer tank and top plate, the top plate bottom surface fixedly connected outer ring pressing block and inner ring pressing block, the transformer tank top surface is provided with the sealing structure corresponding with the position of outer ring pressing block, inner ring pressing block, the sealing structure includes the outer groove and inner groove of being opened in transformer tank top surface, outer groove inside sleeve joint sealing strip, and inner groove inside fills sealant layer;Through the compression sealing cooperation of outer ring pressing block and transformer tank outer groove inner sealing strip of the top plate bottom surface setting and the extrusion filling double-sealing structure of inner ring pressing block and inner groove sealant layer, realize the combination sealing of ladder, wherein elastic sealing strip provides main sealing defense line, liquid solidification sealant layer fills microscopic gap to form secondary adaptive sealing, completely blocks transformer oil from the seepage of box top surface joint, significantly reduce maintenance frequency and improve equipment operation reliability.

Description

Technical Field

[0001] This utility model relates to the field of distribution transformer housings, specifically an oil-proof sealed distribution transformer housing. Background Technology

[0002] A transformer is a device that uses the principle of electromagnetic induction to change alternating current voltage. Its main components are a primary coil, a secondary coil, and an iron core. A transformer can convert electrical energy into a high-voltage, low-current form and then back, thus greatly reducing energy loss during transmission and allowing for longer, more economical transmission distances. This allows power plants to be built far from where electricity is needed. Most of the world's electricity undergoes a series of transformations before reaching users.

[0003] In the prior art, such as in publication number CN208622538U, an optimized compensation transformer housing for residential power distribution is disclosed. It includes a base and a fixed seat. The fixed seat is located at the upper end of the base, and the base and fixed seat are connected by welding. A shock-absorbing device is located inside the upper end of the fixed seat, and the transformer body is located above the shock-absorbing device. Heat sinks are arranged around the outer surface of the transformer body. This invention incorporates sound-absorbing cotton in the transformer housing to absorb noise generated during transformer operation, thus preventing excessive noise. Anti-corrosion and sun-protective films effectively protect the transformer. An oil injection pipe allows for sealing and protection by adding transformer oil. Connecting rods and shock-absorbing pads mitigate impact forces, resulting in better transformer sealing and preventing air leakage, thus solving safety hazards.

[0004] While the aforementioned patents reduce noise and vibration through sound-absorbing cotton and shock-absorbing pads, they lack structural features to improve the sealing of the transformer casing. Oil and water leakage can affect maintenance frequency. Furthermore, the lack of a positioning structure for the cover makes it prone to displacement after long-term use, leading to gaps at the connections and allowing dust to seep in and cause oil and water contamination. Therefore, an oil-proof, sealed distribution transformer casing is proposed to address these issues. Utility Model Content

[0005] To address the shortcomings of existing technologies, such as the lack of structural improvements to the sealing of transformer casings, which can lead to oil and water leaks and affect maintenance frequency, this invention proposes an oil-proof, sealed distribution transformer casing.

[0006] The technical solution adopted by this utility model to solve its technical problem is: the oil-proof and sealed distribution transformer shell of this utility model includes a transformer box and a top plate. The bottom surface of the top plate is fixedly connected to an outer ring pressure block and an inner ring pressure block. The top surface of the transformer box is provided with a sealing structure corresponding to the positions of the outer ring pressure block and the inner ring pressure block. The bottom surface of the top plate is fixedly connected with a positioning component in an axisymmetric manner. The sealing structure includes an outer groove and an inner groove formed on the top surface of the transformer box. A sealing strip is sleeved inside the outer groove, and a sealing adhesive layer is filled inside the inner groove. The positioning component includes a T-shaped plate fixedly connected to the bottom surface of the top plate. Sleeve holes are opened on both sides of the bottom end of the T-shaped plate, and springs are sleeved in the sleeve holes. An extension rod is fixedly connected to the end of the spring, and the extension rod movably passes through the sleeve hole and abuts against the inner wall of the transformer box.

[0007] Preferably, the outer ring pressing block extends vertically downward to directly above the outer groove, and the inner ring pressing block extends vertically downward to directly above the inner groove.

[0008] Preferably, the sealing strip is an elastic rubber component and is completely fitted into the outer groove, and the sealing adhesive layer is a liquid-curing sealant that completely fills the inner groove.

[0009] Preferably, the extension rod moves axially along the sleeve hole under the action of the spring, and when the top plate is closed, the end of the extension rod is always pressed against the inner wall of the transformer box.

[0010] Preferably, the length of the spring in its natural state is greater than the depth of the sleeve hole.

[0011] Preferably, the top plate is fastened to the transformer box by flange bolts, and the pressing surfaces of the outer ring pressure block and the sealing strip, and the pressing surfaces of the inner ring pressure block and the sealing adhesive layer are all parallel to the mounting plane of the top plate.

[0012] The advantages of this utility model are: 1. This utility model achieves a stepped combined seal by pressing and sealing the outer ring pressure block set on the bottom surface of the top plate with the sealing strip in the outer groove of the transformer box, and by squeezing and filling the inner ring pressure block with the sealing adhesive layer of the inner groove with a double sealing structure. The elastic sealing strip provides the main sealing defense line, and the liquid-cured sealing adhesive layer fills the micro gaps to form a secondary adaptive seal, which completely prevents transformer oil from leaking from the joint of the top surface of the box, significantly reduces the maintenance frequency and improves the reliability of equipment operation. 2. The positioning components symmetrically installed at the bottom of the top plate of this utility model continuously push the extension rod against the inner wall of the transformer box through the spring at the bottom end of the T-shaped plate. During the closing process of the top plate, the positional offset is automatically corrected. After the flange bolts are tightened, the extension rod always applies radial thrust under the action of the pre-compression spring, forcing the top plate and the transformer box to maintain concentric positioning, eliminating the risk of misalignment of the sealing structure caused by long-term vibration or thermal deformation, and preventing oil pollution and dust infiltration caused by seal failure. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the sealing structure of this utility model; Figure 3 This is a schematic diagram of the positioning component structure of this utility model; Figure 4 This is a schematic diagram of the disassembled structure of this utility model.

[0015] In the diagram: 1. Transformer box; 2. Top plate; 3. Outer ring pressure block; 4. Inner ring pressure block; 5. Sealing structure; 51. Sealing strip; 52. Sealing adhesive layer; 6. Positioning assembly; 61. T-shaped plate; 62. Spring; 63. Extension rod. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0017] Please see Figures 1-4 As shown, a leak-proof, sealed distribution transformer housing includes a transformer box 1 and a top plate 2. An outer ring pressure block 3 and an inner ring pressure block 4 are fixedly connected to the bottom surface of the top plate 2. A sealing structure 5 corresponding to the positions of the outer ring pressure block 3 and the inner ring pressure block 4 is provided on the top surface of the transformer box 1. The sealing structure 5 includes an outer groove and an inner groove on the top surface of the transformer box 1. A sealing strip 51 is sleeved inside the outer groove, and a sealing adhesive layer 52 is filled inside the inner groove. During operation, the specific assembly process involves first machining concentric annular outer and inner grooves on the top surface of the transformer box 1. A matching elastic rubber sealing strip 51 is then pressed into the outer groove to ensure no warping. Liquid polysulfide sealant is then injected into the inner groove to form a sealing layer 52. The outer ring pressure block 3 and inner ring pressure block 4, welded to the bottom surface of the top plate 2, are aligned with the outer and inner grooves, respectively. The top plate 2 is then tightened with flange bolts, causing the outer ring pressure block 3 to vertically compress the sealing strip 51, resulting in elastic deformation and achieving the primary seal. Simultaneously, the inner ring pressure block 4 compresses the sealing layer 52, filling all microscopic gaps between the pressure block and the groove wall. After curing, a gapless secondary sealing barrier is formed.

[0018] Furthermore, the positioning component 6 includes a T-shaped plate 61 fixedly connected to the bottom surface of the top plate 2. Sleeve holes are opened on both sides of the bottom end of the T-shaped plate 61, and springs 62 are sleeved in the sleeve holes. An extension rod 63 is fixedly connected to the end of the spring 62. The extension rod 63 movably passes through the sleeve hole and abuts against the inner wall of the transformer box 1. During operation, two symmetrically distributed T-shaped plates 61 are welded to the bottom surface of the top plate 2. A pre-compressed spring 62 is inserted into the bottom sleeve hole of the T-shaped plate 61. Extension rods 63 are welded to both ends of the spring 62 so that it can slide axially along the sleeve hole. When the top plate 2 is closed, the ball head at the end of the extension rod 63 contacts the inner wall of the transformer box 1 first. As the top plate 2 moves down, the spring 62 pushes the extension rod 63 to continuously output radial thrust, forcing the top plate 2 to remain concentric with the transformer box 1 during the bolt tightening process. After the flange connection is completed, the extension rod 63 always abuts against the box wall to eliminate vibration displacement.

[0019] Furthermore, the sealing strip 51 is an elastic rubber component and is completely fitted into the outer groove, and the sealing layer 52 is a liquid-cured sealant that completely fills the inner groove; During operation, the sealing strip 51 is fully fitted into the outer groove using an interference fit, and the sealing adhesive layer 52 completely fills the inner groove through an adhesive injection process. When the outer ring pressure block 3 is pressed down, the sealing strip 51 undergoes elastic deformation to form the main seal, and the inner ring pressure block 4 simultaneously squeezes the sealing adhesive layer 52 to fill the micro gaps to form a secondary seal. The dual synergistic effect completely blocks the oil seepage path and significantly extends the service life of the sealing structure.

[0020] Furthermore, under the action of spring 62, the extension rod 63 moves axially along the sleeve hole, and when the top plate 2 is closed, the end of the extension rod 63 is always pressed against the inner wall of the transformer box 1; During operation, the extension rod 63 slides with the spring 62 through the sleeve hole. During the closing process of the top plate 2, the spring 62 pushes the extension rod 63 to continuously abut against the inner wall of the transformer box 1. This pre-compression structure forces the flange of the top plate 2 to be aligned, ensuring that the outer ring pressure block 3 and the inner ring pressure block 4 are always accurately aligned with the sealing structure 5, eliminating the risk of leakage caused by misalignment of the sealing surface.

[0021] Working principle: When the top plate 2 is pressed into the transformer box 1 by the flange bolts, the spring 62 at the bottom of the T-shaped plate 61 in the symmetrically distributed positioning components 6 pushes the extension rod 63 to contact the inner wall of the transformer box 1 first, generating radial preload force, which forcibly corrects the concentricity of the top plate 2 and the transformer box 1; as the bolts continue to tighten, the outer ring pressure block 3 is pressed vertically into the outer groove, causing the sealing strip 51 to undergo elastic deformation to form the first sealing barrier. At the same time, the inner ring pressure block 4 synchronously squeezes the sealing adhesive layer 52 in the inner groove, causing it to flow and fill the micro gaps between the pressure block and the groove wall. After curing, it forms the second adaptive seal; during operation, the extension rod 63 continuously abuts against the box wall under the action of the spring 62 to dynamically compensate for vibration displacement. The double sealing structure works together to block the oil leakage path.

[0022] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, or similar improvements made within the theoretical and principle content of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A leak-proof, sealed distribution transformer housing, characterized in that: The transformer box (1) includes a transformer box (1) and a top plate (2). The bottom surface of the top plate (2) is fixedly connected to an outer ring pressure block (3) and an inner ring pressure block (4). The top surface of the transformer box (1) is provided with a sealing structure (5) corresponding to the position of the outer ring pressure block (3) and the inner ring pressure block (4). The bottom surface of the top plate (2) is fixedly connected with a positioning component (6) in an axisymmetric manner. The sealing structure (5) includes an outer groove and an inner groove on the top surface of the transformer box (1), with a sealing strip (51) sleeved inside the outer groove and a sealing adhesive layer (52) filled inside the inner groove. The positioning component (6) includes a T-shaped plate (61) fixedly connected to the bottom surface of the top plate (2). The bottom end of the T-shaped plate (61) has sleeve holes on both sides, and a spring (62) is sleeved in the sleeve holes. An extension rod (63) is fixedly connected to the end of the spring (62). The extension rod (63) moves through the sleeve hole and abuts against the inner wall of the transformer box (1).

2. The oil-proof sealed distribution transformer housing according to claim 1, characterized in that: The outer ring pressing block (3) extends vertically downward to the top of the outer groove, and the inner ring pressing block (4) extends vertically downward to the top of the inner groove.

3. The oil-proof sealed distribution transformer housing according to claim 1, characterized in that: The sealing strip (51) is an elastic rubber component and is completely fitted into the outer groove, and the sealing layer (52) is a liquid-cured sealant that completely fills the inner groove.

4. The oil-proof sealed distribution transformer housing according to claim 1, characterized in that: The extension rod (63) moves axially along the sleeve hole under the action of the spring (62). When the top plate (2) is closed, the end of the extension rod (63) is always pressed against the inner wall of the transformer box (1).

5. The oil-proof sealed distribution transformer housing according to claim 1, characterized in that: The length of the spring (62) in its natural state is greater than the depth of the sleeve hole.

6. The oil-proof sealed distribution transformer housing according to claim 1, characterized in that: The top plate (2) is fastened to the transformer box (1) by flange bolts. The pressing surfaces of the outer ring pressure block (3) and the sealing strip (51) and the inner ring pressure block (4) and the sealing adhesive layer (52) are parallel to the mounting plane of the top plate (2).

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