Converter transformer body falling box positioning and noise reduction structure

Abstract

The utility model belongs to transformer manufacturing technical field relates to a converter transformer body falls the positioning denoising structure of box, and positioning ring adopts flexible material, and positioning part is the waist drum shape structure, and the lower part of lower clamp piece web is established trapezoidal gap, and the upper surface of positioning part is processed recess, and trapezoidal gap lower part is clamped in recess and is welded fixed connection, and positioning base is the cylinder structure of upper and lower opening, and positioning base is welded in the upper surface of oil tank tank bottom, and the position of positioning base corresponds with the position of positioning part, and several layers of hot -pressing polyester resin laminated board are placed in positioning base, and the diameter of hot -pressing polyester resin laminated board is same with the inside diameter of positioning base, and positioning ring is installed in the positioning base above hot -pressing polyester resin laminated board, and the outer wall of positioning ring is attached to the inner wall of positioning base, and rubber pad is placed in the gap between lower clamp piece web and oil tank tank bottom. The utility model reduces the vibration risk and reduces the noise by increasing the contact surface of body and oil tank tank bottom.

Description

Technical Field

[0001] This utility model belongs to the field of transformer manufacturing technology, specifically relating to a noise reduction structure for the positioning of converter transformer body in the set-top box that can suppress vibration and reduce noise. Background Technology

[0002] With the rapid increase in the number and installed capacity of converter transformers, the noise problem of converter transformers has become increasingly prominent. On-site measurements at converter stations show near-field sound pressure levels reaching as high as 85-100 dB(A). Even with distance attenuation, the noise level near the plant boundary at some converter stations can still reach 60-70 dB(A), exceeding the noise limits for Class 1 or Class 2 areas in the GB12348-2008 "Emission Standard for Environmental Noise at the Boundary of Industrial Enterprises". Therefore, considering the current noise situation of converter transformers and environmental management requirements, effective noise control of converter transformers is urgently needed. During operation, the main causes of noise generation in converter transformers are magnetostriction of silicon steel sheets, high-frequency vibration excited by harmonic currents, and vibration induced by DC bias magnetization. Therefore, how to suppress the vibration of converter transformers has become a technical challenge that urgently needs to be overcome in this field.

[0003] Currently, most converter transformers rest directly on the bottom of the tank using foot pads. Depending on the weight of the transformer body, 3 to 7 foot pads are typically used, with rubber pads placed between the foot pads and the tank bottom for vibration damping. In existing structures, the tank bottom is generally 8-9 meters long and 2.8-3.5 meters wide, while the foot pads are usually designed on the transformer body. Each foot pad is approximately 700mm long and 280mm wide. With a design of 7 foot pads, the contact area between the transformer body and the tank bottom is not large enough. The approximately 300-ton transformer body can easily transmit vibration amplitude to the tank, causing converter transformer vibration and noise. Furthermore, because the tank bottom only contacts the converter transformer at the foot pads, it is prone to displacement during transportation, potentially damaging the converter transformer.

[0004] In conclusion, there is an urgent need for a new type of converter transformer body design structure that can suppress vibration, thereby reducing the noise of the converter transformer. Summary of the Invention

[0005] To address the aforementioned technical problems, this utility model provides a converter transformer body positioning and noise reduction structure. The technical solution adopted by this utility model is as follows: A noise reduction structure for positioning the transformer body in the tank is disclosed. The structure is installed between the lower clamp web and the bottom of the tank. It includes a positioning element, a positioning base, a positioning ring, a rubber pad, and a hot-pressed polyester resin laminate. The positioning ring is made of a flexible material. The positioning element has a drum-shaped structure. Several trapezoidal notches are formed at the lower part of the lower clamp web. Grooves are machined on the upper surface of the positioning element, with the width of the grooves greater than the thickness of the lower clamp web. The lower part of the trapezoidal notches of the lower clamp web is engaged in the grooves and welded for fixation. The positioning base is a cylindrical structure with openings at the top and bottom. The positioning base is welded to the upper surface of the tank bottom, and its position corresponds to the position of the positioning element. Several layers of hot-pressed polyester resin laminate are placed in the positioning base, with the diameter of the hot-pressed polyester resin laminate being the same as the inner diameter of the positioning base. The positioning ring is installed in the positioning base above the hot-pressed polyester resin laminate, with the outer wall of the positioning ring fitting against the inner wall of the positioning base. A rubber pad is placed in the gap between the lower clamp web and the bottom of the tank.

[0006] Preferably, the positioning ring is made of polyurethane rubber.

[0007] Preferably, both the positioning component and the positioning base are made of low-alloy steel Q355 steel plate.

[0008] Preferably, the lower outer side of the positioning base is chamfered with a triangular notch for filling the weld seam.

[0009] The beneficial effects of this utility model are: This invention eliminates the traditional foot pad structure and designs a positioning and noise reduction structure that ensures full contact between the entire lower clamping plate of the vessel body and the bottom of the tank. By increasing the contact area between the vessel body and the tank bottom, vibration risk is reduced, thereby lowering noise. The drum-shaped positioning component presses against the positioning ring after the vessel body is lowered into the tank, thus achieving the positioning purpose. Although there may be some error in the placement of the vessel body, the small diameter of the bottom part of the positioning component does not affect its complete insertion into the positioning ring after the vessel body is lowered. Furthermore, this structure eliminates the need for operators to enter the tank, saving manpower and avoiding safety hazards. Attached Figure Description

[0010] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a front view of the positioning component according to Embodiment 1 of this utility model; Figure 2 This is a top view of the positioning component according to Embodiment 1 of this utility model; Figure 3 This is a left view of the positioning component according to Embodiment 1 of this utility model; Figure 4This is a schematic diagram of the welding positioning element on the web of the lower clamping member in Embodiment 1 of this utility model; Figure 5 This is a schematic diagram of the positioning base welded to the bottom of the fuel tank in Embodiment 1 of this utility model; Figure 6 This is a schematic diagram of the positioning component falling into the positioning base in Embodiment 1 of this utility model; Figure 7 This is a schematic diagram of the positioning and noise reduction structure between the lower clamp web and the bottom of the oil tank in Embodiment 2 of this utility model; Figure 8 for Figure 7 A magnified view of the left end; In the figure, 1 is the positioning component, 2 is the groove, 3 is the positioning base, 4 is the positioning ring, 5 is the web of the lower clamping component, 6 is the bottom of the oil tank, 7 is the weld, 8 is the rubber pad, and 9 is the hot-pressed polyester resin laminate. Detailed Implementation

[0011] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0012] Example 1:

[0013] like Figure 1-6 As shown, a noise reduction structure for positioning the converter transformer body under the tank is disclosed. The noise reduction structure is installed between the web plate 5 of the lower clamp and the bottom 6 of the tank. It includes a positioning component 1, a positioning base 3, and a positioning ring 4. The positioning ring 4 is made of a flexible material, such as polyurethane rubber, which has a high coefficient of friction and good buffering and shock absorption performance. Polyurethane rubber has excellent elasticity, elongation, compressive strength, and softness. The positioning ring 4 made of polyurethane rubber is used for the noise reduction structure under the converter transformer body, which is the first time it has been proposed and used in the industry.

[0014] The converter transformer body includes a core column, which is clamped and fixed to the upper clamping web plate by a lower clamping web plate 5 to ensure that the core column will not deform due to vibration or external force during the operation of the converter transformer. Several positioning elements 1 are welded to the lower part of the lower clamping web plate 5. The positioning elements 1 are drum-shaped structures, thicker in the middle and thinner at both ends, and are made of low-alloy steel Q355 plate. To facilitate the welding of the positioning elements 1 to the lower clamping web plate, trapezoidal notches are made at corresponding positions on the lower part of the lower clamping web plate 5 for welding the positioning elements 1. Simultaneously, grooves 2 are machined on the upper surface of the positioning elements 1. The width of the grooves 2 is slightly larger than the thickness of the lower clamping web plate 5; for example, if the thickness of the lower clamping web plate 5 is 50mm, the width of the grooves 2 is machined to 52mm. The lower part of the trapezoidal notch of the lower clamping web plate 5 is then inserted into the groove 2 before welding, ensuring the strong weld between the positioning elements 1 and the lower clamping web plate 5. The number of positioning elements 1 welded can be flexibly set according to the weight of the converter transformer body.

[0015] The positioning base 3 is welded to the upper surface of the tank bottom 6. The positioning base 3 is a cylindrical structure with openings at the top and bottom, and is made of low-alloy steel Q355 plate. The welding position of the positioning base 3 on the tank bottom 6 corresponds to the position of the positioning component 1. The positioning ring 4 is installed in the positioning base 3, and the height of the positioning ring 4 is basically the same as the height of the positioning base 3. The outer wall of the positioning ring 4 fits against the inner wall of the positioning base 3. Before placing the positioning ring 4, two layers of hot-pressed polyester resin laminate 9 are placed in the positioning base 3. The diameter of the hot-pressed polyester resin laminate 9 is basically the same as the inner diameter of the positioning base 3, and the thickness of a single layer of hot-pressed polyester resin laminate 9 is 3mm. After the device body is lowered, the positioning component 1 is inserted into the positioning ring 4. The cone-shaped structure at the bottom of the positioning component 1 facilitates the accurate insertion of the positioning component 1 into the positioning ring 4. Furthermore, the lower surface of the positioning component 1 contacts the hot-pressed polyester resin laminate 9. The lower section of the positioning component 1 presses against the upper part of the positioning ring 4. This positioning and noise reduction structure can effectively suppress vibration and reduce noise while ensuring accurate positioning of the device body.

[0016] When the positioning base 3 is welded to the bottom of the oil tank 6, the lower surface of the positioning base 3 needs to be precision machined. The lower part of the outer side of the positioning base 3 is chamfered to form a triangular notch. The triangular notch is used to fill the weld 7. The inner side of the positioning base 3 is not welded to the upper surface of the bottom of the oil tank 6. The upper edge of the positioning base 3 is rounded.

[0017] Example 2:

[0018] like Figure 7 , 8As shown, after the converter transformer body is lowered into the tank, and the positioning component 1 is accurately inserted into the positioning ring 4, there may be a gap of about 5mm between the contact area between the lower clamp web 5 and the tank bottom 6, except for the positions where the positioning component 1 and the positioning base 3 are installed. A rubber pad 8 is placed in this gap for cushioning, and the rubber pad 8 also serves as insulation. By filling the gap between the lower clamp web 5 and the tank bottom 6 with the rubber pad 8, the lower clamp web 5 presses down on the tank bottom 6 along its entire length, increasing the contact area between the lower clamp web 5 and the tank bottom 6 and further reducing the risk of vibration, thereby reducing the noise of the converter transformer. Compared to the traditional disassembled foot structure at the bottom of the transformer body, the use of the positioning component 1 in conjunction with the positioning base 3 and the rubber pad 8 to directly press the lower clamp web 5 onto the tank bottom 6 can better suppress the vibration of the converter transformer and reduce noise.

[0019] In this embodiment of the utility model, all technical features not described in detail are existing technologies or conventional technical means, and will not be repeated here.

[0020] Finally, it should be noted that the above embodiments are merely specific implementations of this utility model, used to illustrate the technical solution of this utility model, and not to limit it. The protection scope of this utility model is not limited thereto. Those skilled in the art should understand that any person skilled in the art can modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the technical scope disclosed in this utility model; and these modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model, and should all be covered within the protection scope of this utility model.

Claims

1. A converter transformer tank falling box positioning noise reduction structure, characterized in that, The positioning and noise reduction structure is installed between the lower clamping web (5) and the bottom of the oil tank (6), including a positioning component (1), a positioning base (3), a positioning ring (4), a rubber pad (8), and a hot-pressed polyester resin laminate (9). The positioning ring (4) is made of flexible material. The positioning component (1) has a drum-shaped structure. Several trapezoidal notches are opened at the lower part of the lower clamping web (5). The upper surface of the positioning component (1) is machined with a groove (2). The width of the groove (2) is greater than the thickness of the lower clamping web (5). The lower part of the trapezoidal notch of the lower clamping web (5) is stuck in the groove (2) and welded and fixedly connected. The positioning base (3) is a cylindrical structure with openings at the top and bottom. The positioning base (3) is welded to the upper surface of the bottom of the oil tank (6). The position of the positioning base (3) corresponds to the position of the positioning component (1). Several layers of hot-pressed polyester resin laminate (9) are placed in the positioning base (3). The diameter of the hot-pressed polyester resin laminate (9) is the same as the inner diameter of the positioning base (3). The positioning ring (4) is installed in the positioning base (3) above the hot-pressed polyester resin laminate (9). The outer wall of the positioning ring (4) is attached to the inner wall of the positioning base (3). A rubber pad (8) is placed in the gap between the lower clamping web plate (5) and the bottom of the oil tank (6).

2. The converter transformer body positioning and noise reduction structure according to claim 1, characterized in that, The positioning ring (4) is made of polyurethane rubber.

3. The converter transformer tank positioning noise reduction structure of claim 2, wherein, Both the positioning component (1) and the positioning base (3) are made of low alloy steel Q355 steel plate.

4. The converter transformer tank positioning noise reduction structure of claim 3, wherein, The lower part of the outer side of the positioning base (3) is chamfered to have a triangular notch for filling the weld (7).

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