A sound barrier with a rotating mechanism for a transformer

Abstract

The utility model provides a kind of sound barrier with openable and closable for transformer with rotating mechanism, comprising: concrete foundation, steel structure, sound barrier plate;The steel structure is arranged in the both sides of the sound barrier plate, for fixed installation the sound barrier plate;The steel structure is fixed on the concrete foundation;The sound barrier plate includes sound barrier plate adjustable part, and the adjustable part includes horizontal outer frame and rotating plate;The rotating plate is composed of noise reduction board and rotating shaft, and the rotating shaft is arranged in the middle of the noise reduction board, to realize the opening and closing of the sound barrier plate adjustable part.The utility model realizes the working condition switching of daytime opening and nighttime closing by rotatable sound barrier plate, which not only ensures the required air intake of daytime cooler, but also meets the nighttime plant boundary noise standard;Without increasing additional power ventilation equipment, reduce operating energy consumption and operation workload;Overall structure is modularized and standardized, facilitating transportation and on-site rapid installation.

Description

Technical Field

[0001] This utility model relates to an openable and closable sound barrier for reducing noise from large transformers. It is particularly suitable for situations such as thermal power plants and substations where transformer heat dissipation must be ensured during the day and noise emission standards at the plant boundary must be met at night. It belongs to the field of power equipment noise control technology. Background Technology

[0002] In large thermal power plants, converter stations, and key substations, oil-immersed transformers, including main transformers and standby transformers, are typically located adjacent to the outer wall of the main plant or situated in a narrow strip of land between the main plant and the plant boundary wall. With increasing unit capacity and plant land density, the minimum distance between transformers and the plant boundary is often less than 30 meters, sometimes even only about 10 meters. GB12348, the "Emission Standard for Environmental Noise at the Boundary of Industrial Enterprises," sets the daytime limit for Class III acoustic environment functional zones at 65 dB(A) and the nighttime limit at 50 dB(A) (some cities implement 55 dB(A)). The A-weighted sound power level of a transformer under rated load can reach 85–100 dB(A). Without any noise reduction measures, nighttime noise at the plant boundary generally exceeds the standard by more than 10 dB(A). Therefore, in engineering practice, the common method is to install fixed sound barriers around the transformers for noise control.

[0003] The typical approach for current fixed noise barriers is as follows: A U-shaped planar layout is used, with the opening facing the main plant building. The total height of the barrier is 6–8m (2–3m higher than the top of the transformer body). The columns are made of hot-rolled H-beams or rectangular tubes, with a column spacing of 2.5–3m. Metal sound-absorbing and insulating panels with a thickness of 80–120mm are inserted between the columns. The sound-absorbing and insulating panels are formed by bending 1.5–2mm galvanized steel sheets to form the outer shell, supported internally by a C-shaped or rectangular frame. The cavity is filled with 48kg / m³ high-density water-repellent glass wool or rock wool, and the perforated plate on the inner side has an opening rate of ≥20%. The surface is then covered with a dustproof and oil-proof coating. This structure has an insertion loss of approximately 5–7dB(A) at 500Hz and an overall noise reduction of 3–8dB(A), which is sufficient to bring the nighttime plant boundary noise level up to the acceptable standard.

[0004] However, the heat output of oil-immersed transformers, on-load tap changers, and coolers (air coolers or finned heat exchangers) varies significantly with load and ambient temperature. Taking a 750MVA main transformer as an example, the total airflow requirement for the cooler under rated operating conditions is as high as 40–60 m³ / s, and the surface temperature of the radiator can reach over 80℃. During the daytime, with high ambient temperatures and strong solar radiation, the cooler is particularly sensitive to inlet air temperature and velocity. Fixed, enclosed sound barriers form a semi-enclosed cavity in the height direction, which easily leads to the following problems:

[0005] Hot air recirculation: The hot air exhausted from the air cooler is reflected by the top of the barrier and re-enters the air inlet, causing the inlet air temperature to rise by 5–10°C and the cooling efficiency to decrease by 15–25%.

[0006] Airflow short circuit: The negative pressure zone and the positive pressure zone on both sides of the barrier are connected, forming a local vortex, which reduces the air intake by more than 20%;

[0007] Localized overheating: The temperature of the hottest spot in the coil rises, accelerating insulation aging, and in severe cases, triggering the winding temperature protection to trip.

[0008] To alleviate the heat dissipation problem, three expedient measures are often forced to be taken on site:

[0009] a) Temporarily dismantling or lowering some of the barrier panels during the day and then manually restoring them at night increases the number of high-altitude operations and power outage opportunities;

[0010] b) Adding multiple axial flow fans to the top of the barrier for forced ventilation not only increases power consumption by hundreds of kilowatts, but also introduces new fan noise;

[0011] c) Reduce transformer load operation, sacrificing power generation economy.

[0012] None of the above measures have fundamentally resolved the cyclical contradiction of needing open ventilation during the day and closed noise reduction at night. Therefore, developing an adjustable sound barrier that can quickly and reliably switch between "open" and "closed" states according to different daytime and nighttime operating conditions has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0013] To address the shortcomings of existing fixed sound barriers in simultaneously addressing both daytime heat dissipation and nighttime noise reduction for transformers, this invention proposes an openable and closable sound barrier for transformers with a rotating mechanism. Its purpose is to: achieve daytime opening and nighttime closing through a rotating sound barrier panel, ensuring the required airflow for the cooler during the day while meeting nighttime noise standards at the plant boundary; reduce operating energy consumption and maintenance workload without adding additional power ventilation equipment; and feature a modular and standardized overall structure for easy transportation and rapid on-site installation.

[0014] A transformer-mounted, openable and closable sound barrier with a rotating mechanism includes: a concrete foundation, a steel structure, and a sound barrier panel; the steel structure is disposed on both sides of the sound barrier panel for fixing the sound barrier panel; the steel structure is fixed to the concrete foundation; the sound barrier panel includes an adjustable portion, the adjustable portion including a horizontal outer frame and a rotating plate; the rotating plate consists of a noise reduction plate and a rotating shaft, the rotating shaft being arranged in the middle of the noise reduction plate to realize the opening and closing of the adjustable portion of the sound barrier panel.

[0015] Furthermore, the steel structure is made of hot-rolled profiles and galvanized steel sheets, etc., and is manufactured into individual pieces by welding. The individual pieces are then connected and installed on site by bolts.

[0016] Furthermore, the sound barrier board includes: a cylindrical sound absorber, a fixed part of the sound barrier board, and an adjustable part of the sound barrier board.

[0017] Furthermore, an annular skeleton is provided inside the cylindrical sound absorber, and the internal cavity is filled with high-density sound-absorbing cotton and wrapped with a protective cloth.

[0018] Furthermore, the fixed part of the sound barrier board is composed of several noise reduction board units, and both ends are fixed by being stuck in the grooves of the steel structure.

[0019] Furthermore, skeletons are arranged horizontally and vertically inside the noise reduction board, the skeleton cavity is filled with high-density sound-absorbing cotton and wrapped with a protective cloth; the inner surface is made of perforated galvanized steel plate.

[0020] Furthermore, the horizontal outer frame is made by welding galvanized square tubes or rectangular tubes, the vertical outer frame is bent from galvanized steel plates of the same thickness, and the inner side is designed with an inclined surface; the horizontal outer frame and the vertical outer frame are welded into a "square" shape.

[0021] Furthermore, the rotating plate consists of a noise reduction board and a rotating shaft, and the rotating shaft is arranged in the middle of the noise reduction board.

[0022] Furthermore, skeletons are arranged horizontally and vertically inside the noise reduction board, the skeleton cavity is filled with high-density sound-absorbing cotton and wrapped with a protective cloth; the inner surface is made of perforated galvanized steel plate.

[0023] Furthermore, the outer sides of the left and right ends of the noise reduction board are designed with inclined surfaces, which are consistent with the inclined surfaces of the vertical outer frames of the horizontal outer frame.

[0024] Furthermore, the rotating shaft is arranged in a full-length manner, passes through the noise reduction board as a whole, and both ends are inserted and fixed on the horizontal outer frame, and bearings are provided at the contact parts to facilitate the rotation of the rotating shaft.

[0025] Furthermore, the adjustable part of the sound barrier board further includes: an up-and-down two-point pressing lock, a wire pipe and cables, an unlocking switch, an electromagnetic lock bracket, and an electromagnetic lock.

[0026] Furthermore, the electromagnetic lock bracket is made of a galvanized steel pipe into a triangular bracket, horizontally installed on the horizontal outer frame, and an electromagnetic lock installation base is provided at the end to facilitate the installation and fixation of the electromagnetic lock.

[0027] Beneficial effects

[0028] This invention utilizes a 90° rotation of the rotating plate to create an open top channel during the day, which, according to actual measurements, increases the cooler's air intake by ≥30% and reduces the air intake temperature by 4–6 ℃, eliminating the need for additional mechanical ventilation. At night, when the rotating plate is closed, the overall sound insulation is ≥8 dB(A), and the factory boundary noise meets the 50 dB(A) limit. The opening and closing operation requires only one person and takes less than 3 minutes, eliminating the need for power outages and avoiding the risks of working at heights. All components are prefabricated in the factory and assembled on-site with bolts, shortening the construction cycle by more than 30%. Subsequent maintenance only requires replacing the bearings and locks purchased from external suppliers, resulting in low maintenance costs. Attached Figure Description

[0029] Figure 1 This is a panoramic view of the operable sound barrier in the closed state of Embodiment 1;

[0030] Figure 2 This is a panoramic view of the openable and closable sound barrier in the first embodiment when it is in the open state.

[0031] Figure 3 This is the openable and closable sound barrier in the closed state of Embodiment 1;

[0032] Figure 4 This is the openable sound barrier in Implementation Example 1;

[0033] Figure 5 This is a diagram of the adjustable part of the openable and closable sound barrier in the closed state of Embodiment 1.

[0034] Figure 6 This is a diagram of the adjustable part of the openable and closable sound barrier in the first embodiment when it is in the open state. Detailed Implementation

[0035] To better understand the purpose, technical solution, and technical effects of this utility model, the following further description of this utility model is provided, but the scope of protection of this utility model is not limited to the following embodiments.

[0036] like Figure 1-6 As shown, a closable sound barrier for transformers with a rotating mechanism includes: a concrete foundation 1, a steel structure 2, and a sound barrier panel 3; the steel structure 2 is disposed on both sides of the sound barrier panel 3 for fixing the sound barrier panel 3; the steel structure 2 is fixed on the concrete foundation 1; the sound barrier panel 3 includes an adjustable part 3.3, the adjustable part 3.3 includes a horizontal outer frame 3.3.1 and a rotating plate 3.3.2; the rotating plate 3.3.2 is composed of a noise reduction plate and a rotating shaft, the rotating shaft being arranged in the middle of the noise reduction plate to realize the opening and closing of the adjustable part 3.3 of the sound barrier panel.

[0037] Furthermore, the concrete foundation 1 is graded C30 and includes: reinforcing bars, stirrups, coarse and fine aggregates, cement, and water.

[0038] Furthermore, the steel structure 2 is made of hot-rolled profiles and galvanized steel sheets, etc., and is manufactured into individual pieces by welding. The individual pieces are then connected and installed on site by bolts.

[0039] Furthermore, the sound barrier panel 3 includes: a cylindrical sound absorber 3.1, a fixed part of the sound barrier panel 3.2, and an adjustable part of the sound barrier panel 3.3.

[0040] The cylindrical sound absorber 3.1 has an outer surface made of galvanized steel sheet bent into shape, with a steel sheet thickness of 0.8-1.5mm, and the surface is painted or powder coated. The inner ring frame is set up, with a steel sheet thickness of 1.0-1.5mm, and the surface is painted or powder coated. The internal cavity is filled with high-density sound-absorbing cotton and wrapped with protective cloth.

[0041] The sound barrier panel fixing part 3.2 consists of several noise reduction panel units, with an external dimension of 500-1000mm in width, 3500mm in length, and 80-150mm in thickness. Both ends are fixed within the grooves of the steel structure 2. The outer surface of each noise reduction panel unit is made of galvanized steel sheet, bent and welded, with a steel sheet thickness typically 1.5-2.0mm, and is painted or powder-coated. An internal horizontal and vertical frame is installed, also made of galvanized steel sheet, bent and welded, with a steel sheet thickness typically 1.0-1.5mm, and is painted or powder-coated. High-density sound-absorbing cotton is filled into the frame cavity and wrapped with protective cloth. The inner surface is made of perforated galvanized steel sheet, with a steel sheet thickness typically 0.8-1.2mm, and is painted or powder-coated. All components are fixed by riveting.

[0042] The adjustable part 3.3 of the sound barrier panel includes: a horizontal outer frame 3.3.1 and a rotating plate 3.3.2. The horizontal outer frame 3.3.1 is made of galvanized rectangular or square tubing welded together, with profile dimensions of 80*80*3mm~150*150*5mm. The vertical outer frame is made of galvanized steel sheet of the same thickness bent, with a beveled design on the inner side. The horizontal and vertical outer frames are welded into a "U" shape, and the surface is painted or powder-coated. The rotating plate 3.3.2 consists of a noise-reducing plate and a rotating shaft. The rotating shaft is located in the middle of the noise-reducing plate, which reduces the cantilever length of the rotating module and helps maintain structural balance when the module is open. The noise reduction panel's outer surface is made of galvanized steel sheet, bent and welded, with a thickness typically of 1.5-2.0mm. The surface is painted or powder-coated. An internal horizontal and vertical frame is constructed, also made of galvanized steel sheet, bent and welded, with a thickness typically of 1.0-1.5mm. The frame is painted or powder-coated, and high-density sound-absorbing cotton is filled within the frame cavity, which is then wrapped with protective cloth. The inner surface is made of perforated galvanized steel sheet, with a thickness typically of 0.8-1.2mm, and is also painted or powder-coated. The outer sides of the noise reduction panel at both ends are beveled, matching the beveled surfaces of the horizontal outer frame 3.3.1's vertical outer frame. The rotating shaft is continuous, passing through the noise reduction panel, and its ends are inserted and fixed to the horizontal outer frame 3.3.1. Bearings are installed at the contact points to facilitate the shaft's rotation.

[0043] The adjustable part 3.3 of the sound barrier panel also includes: a two-point clamping lock 3.3.3, which is an outsourced component, usually a 1-inch national standard container door lock.

[0044] The adjustable part 3.3 of the sound barrier panel also includes: conduit 3.3.4 and cable, wherein the conduit 3.3.4 and cable are purchased electrical components, typically consisting of 25mm diameter galvanized steel pipe and cable.

[0045] The adjustable part 3.3 of the sound barrier panel also includes an unlocking switch 3.3.5. The unlocking switch 3.3.5 is an externally purchased electrical component with a button on its surface. Maintenance personnel can release the electromagnetic lock by pressing the button to trigger a signal.

[0046] The adjustable part 3.3 of the sound barrier panel also includes: an electromagnetic lock bracket 3.3.6, which is a triangular bracket made of galvanized steel pipe and is horizontally installed on the horizontal outer frame 3.3.1. The end is provided with an electromagnetic lock mounting base to facilitate the installation and fixation of the electromagnetic lock 3.3.7. The electromagnetic lock 3.3.7 is an externally purchased electrical component that unlocks or locks through an electrical signal.

[0047] Operating principle: When daytime noise requirements at the plant boundary are low or ambient temperatures are high and transformer heat dissipation requirements are high, maintenance personnel can pull out the rotating plate 3.3.2 by operating the two-point clamping lock 3.3.3. When rotated to 90°, the rotating plate 3.3.2 is attracted by the electromagnetic lock 3.3.7, thus opening and locking the sound barrier. Conversely, maintenance personnel can first press the unlocking switch 3.3.5 to de-energize and unlock the electromagnetic lock 3.3.7, and then push the rotating plate 3.3.2 back by operating the two-point clamping lock 3.3.3, thus closing the sound barrier.

[0048] The above embodiments are merely specific descriptions of feasible implementations of the present utility model and are not intended to limit the patent protection scope of the present utility model. All equivalent implementations or modifications that do not depart from the present utility model should be included in the patent scope of this case.

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