CN104895024A - Combined protective sound lock device of pumped storage power station and manufacturing method of sound insulation wall - Google Patents

Abstract

The invention discloses a combined protective sound barrier device and sound insulation wall manufacturing method of a pumped storage power station, which comprises a sound barrier fixed section, a sound brake assembly section, a sound barrier passage door and a closed sound insulation body surrounded by a sound insulation wall on the top floor. There is a ventilation and sound-absorbing system; the side wall is fixed with a combined sound-absorbing sheet on the inner side of the stainless steel plate, including a micro-perforated sound-absorbing panel on the inner layer and at least two layers of low-frequency damping and sound-insulating layers. The low-frequency damping and sound-insulating layer includes a corrugated support mesh in the center 1. Set the sound insulation cotton of equal thickness on the outside of the support mesh, set the equal thickness of flat rubber powder polystyrene particle layer on the inside of the support mesh, and the rest are rubber particle adhesive layers. The sound gate of the present invention adopts a combination of double sound-proof doors and an internal sound-absorbing space, with flexible design, combined design and installation, easy disassembly, and meeting the needs of overhaul. By installing the sound brake, the on-site noise is reduced during the operation of the equipment, which meets the labor hygiene standards and is beneficial to the health of the staff engaged in on-site duty and maintenance.

Description

Combined protective sound brake device and sound insulation wall manufacturing method for pumped storage power station

technical field

The invention belongs to the technical field of noise elimination of a pumped storage power station, and in particular relates to a combined protective sound brake device formed by partial transformation of a pumped storage power station.

Background technique

Baoquan pumped storage power station is equipped with 4 sets of 300MW reversible pumped storage generating units, which have the functions of power generation, power phase modulation, pumping, pumping phase modulation, emergency backup, and black start. The rated head of the unit is 510m, and the rated speed is 500rpm. The pump turbine is a split structure, and the waterwheel room is open. The noise source of the waterwheel room is mainly the noise generated by the interaction between the runner and the water flow during the operation of the unit. Due to the characteristics of high water head and high speed of the pumped storage power station, so The waterwheel room generates a lot of noise when the unit is running, and the ceiling and walls are smooth and hard reflective surfaces, so the noise is superimposed on the reverberation sound generated in the waterwheel room.

There are 4 waterwheel rooms in total, and a monitoring point is selected: 1 meter away from the equipment in the 4# waterwheel room. Equipment operation: 108 dB(A); background sound: about 65 dB(A). According to the superposition principle of noise sources, it can be calculated that if 4 units work at the same time, the noise value at the opening must exceed 100dB(A). In addition, the smooth reinforced concrete wall in the factory building has a very low sound absorption coefficient, which is also The reverberation sound in the factory building increases, which can further increase the noise value in the factory building, which greatly exceeds the national labor hygiene standard of 85dB (A), seriously affecting the on-duty and maintenance work of the on-site staff and causing harm to their health.

The noise in the waterwheel room is manifested as mechanical noise and aerodynamic noise, with obvious medium and low frequency characteristics. A sound brake is installed at the exit of the waterwheel room to isolate the noise of the waterwheel room, and a sound-absorbing layer is formed between the channels of the sound brake. By installing the sound brake, the noise generated in the waterwheel room can be effectively reduced when the unit is running, which is beneficial to the health of the staff engaged in on-site duty and maintenance.

Contents of the invention

The present invention aims at the problems of high noise and poor sound insulation performance of the equipment installed in the current energy storage power station, and provides a combined protective sound brake device that can effectively reduce the noise generated by the waterwheel room and is beneficial to the health of the staff engaged in on-site duty and maintenance. .

In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions: provide a combined protective sound brake device for a pumped storage power station, which includes a sound brake fixing section, a sound brake assembly section, a sound brake access door and a closed sound insulation wall surrounded by a sound insulation wall on the top floor. body, the sound brake fixed sections at both ends are respectively fixed on the channel wall, and the sound brake assembly section and the sound brake fixed section are assembled for sound insulation; a ventilation and noise reduction system is also provided; the sound brake fixed section, the sound brake assembly section and the sound brake assembly section The side wall of the gate access door is fixed with a combined sound-absorbing sheet on the inner side of the stainless steel plate. The combined sound-absorbing sheet includes a micro-perforated sound-absorbing panel on the inner layer and at least two layers of low-frequency damping and sound-insulating layers. The low-frequency damping and sound-insulating layer is located inside the stainless steel plate and Wrap stainless steel keels; the low-frequency damping and sound-insulating layer is a rectangular or splicable convex-concave structure, including a corrugated support mesh in the center, and sound-proof cotton of equal thickness is arranged on the outside of the support mesh. Flat rubber powder polystyrene particle layer of equal thickness, and the rest are rubber particle adhesive layer.

The corrugations of the corrugated support mesh are regular corrugations with equal wavelengths, and the wavelength of the at least two low-frequency damping and sound-insulating layers gradually increases from the inside to the outside of the regular corrugated support mesh.

The corrugations of the corrugated support mesh are irregular corrugations with unequal wavelengths, and the average wavelength of the irregular corrugated support mesh gradually increases from the inside to the outside of the at least two low-frequency damping and sound-insulating layers.

The adjacent low-frequency damping and sound-insulating layers adopt a lap joint structure, that is, the support mesh, sound-insulating cotton and flat rubber powder polystyrene particle layers in the adjacent low-frequency damping and sound-insulating layers are overlapped and bonded together.

A soundproof observation window is provided on the sound brake assembly section or the sound brake access door. There is a sound-absorbing louver at the air outlet of the ventilation and sound-absorbing system. The combined sound-absorbing sheet is fixed on the channel side wall of the ventilation and sound-absorbing system.

The butt joint between the sound brake fixing section, the sound brake assembly section and the sound brake passage door adopts a double-step matching and sealing joint.

The sound-insulating cotton is selected from environmentally friendly polyester fiber sound-absorbing cotton. The micro-perforated sound-absorbing panel adopts a micro-perforated aluminum sound-absorbing panel, and the perforation rate and aperture of the micro-perforated aluminum sound-absorbing panel are designed according to 1/3 octave of the center frequency of 500 Hz.

A method for manufacturing a sound insulation wall for a sound brake device of a pumped storage power station,

First make the low-frequency damping sound insulation layer: fix the sound insulation cotton of equal thickness on the surface side of the flat support mesh, then place the support mesh with the sound insulation cotton in the mold, make the side of the support mesh upward, and add flat into the mold Rubber powder polyphenylene particles are mixed with adhesive, stirred evenly and paved. Before solidification and hardening, corrugate the combination of support net, sound insulation cotton and flat rubber powder polystyrene particle layer to make it regular or irregular. Corrugated; rubber particles are used to level the surface on both sides of the combination. The process is: place the corrugated combination in the mold, add rubber particles containing adhesive and level the surface, and turn the other side up after the glue solidifies Put it into the mold again, add rubber particles containing adhesive and level the surface to form a rectangular or convex-convex flat plate that can be spliced;

Production of combined sound-absorbing sheet: combined sound-absorbing sheet is to paste micro-perforated sound-absorbing panels on the inner side of at least two low-frequency damping and sound-insulating layers; a lap joint structure is used between adjacent low-frequency damping and sound-insulating layers, that is, the adjacent low-frequency damping and sound-insulating layers are The support mesh, sound insulation cotton and flat rubber powder polystyrene particle layer in the sound layer are overlapped and pasted together;

Fix the combined sound-absorbing sheet on the inner side of the stainless steel plate; the outer low-frequency damping and sound-insulating layer is pasted and fixed together with the stainless steel plate; the inner side of the stainless steel plate is provided with a keel for strengthening the structure, and all or part of the low-frequency damping and sound-insulating layer is wrapped in stainless steel Keel surface.

The beneficial effects of the present invention are as follows: 1. The sound gate adopts a double sound insulation door structure, and is equipped with channel sound absorption treatment at the same time, so as to achieve the dual goals of reducing the reverberation sound of the sound source and isolating its sound leakage. The inner side of the stainless steel plate is pasted with a low-frequency damping sound insulation layer, and the calculation formula for the increased sound insulation that can be increased by setting the sound brake is as follows:

N=10lg（1 / s[cos4/2πd2 +(1-α)/A]）

In the formula: N: sound insulation, A: total sound absorption of the inner surface of the sound brake, S: area of the door leaf, α: average sound absorption coefficient of the inner surface of the sound brake, d: center distance between two doors.

After calculation, the noise value at the exit of the waterwheel room will be reduced by more than 30dB(A) after being treated by the sound brake. Considering the insurmountable vibration and sound transmission, the total noise reduction effect can be guaranteed at 25dB( A) Above.

2. The sound brake adopts a combination of double sound-proof doors and internal sound-absorbing space, with flexible design, combined design and installation, easy to disassemble and meet the needs of overhaul. By installing the sound brake, the on-site noise is reduced during the operation of the equipment, which meets the labor hygiene standards and is beneficial to the health of the staff engaged in on-site duty and maintenance.

3. Set up a soundproof observation window, which is convenient for observing the operation of the internal equipment in the equipment room. The double-layer glass is pasted with sound-proof film in the middle. The thickness of the two-layer glass must conform to the noise spectrum characteristics, and a micro-angle angle is formed between the two layers of glass to prevent the coupling effect and maximize the sound insulation performance.

Description of drawings

Fig. 1 is a schematic plan view of the sound brake of the present invention;

Fig. 2 is the elevation view of the sound brake of the present invention;

Fig. 3 is the plane layout diagram of the sound brake of the present invention;

Fig. 4 is a schematic cross-sectional view of the sound-absorbing channel in the middle of the sound brake of the present invention;

Fig. 5 is a schematic cross-sectional structure diagram of the sound barrier sound insulation wall of the present invention;

Fig. 6 is a schematic diagram of the enlarged structure of part A of Fig. 5;

Fig. 7 is a schematic diagram showing the enlarged structure of part B of Fig. 5;

Fig. 8 is a double-step schematic diagram of a combined soundproof wall or a soundproof passage door;

Figure 9 and Figure 10 are schematic diagrams of the sound insulation system installed in the air inlet and outlet channels of the sound brake respectively.

In the figure, the number 1 is the combined sound brake, the number 2 is the maintenance track, the number 3 is the pumped storage generator set, and the number 4 is the wall. 101 is the fixed section of the sound brake, 102 is the sound-absorbing louver, 103 is the sound-proof observation window, 104 is the passage door of the sound brake, 105 is the assembly section of the sound brake, 106 is the fan, 107 is the air outlet silencer, 108 is the air inlet silencer, 109 is the top sound insulation wall, 110 is the side sound insulation wall, 111 is the combined noise reduction sheet, 112 is the stainless steel plate, 113 is the stainless steel keel, 114 is the outer low frequency damping sound insulation layer, 115 is the middle low frequency damping sound insulation layer, 116 is the inner Layer low-frequency damping sound insulation layer, 117 is a micro-perforated sound-absorbing panel, 118 is a support mesh, 119 is a sound-insulating cotton, 120 is a flat rubber powder polystyrene particle layer, and 121 is a rubber particle.

Detailed ways:

The present invention will be further described below in conjunction with accompanying drawing.

Embodiment 1: The combined protective sound brake device of the pumped-storage power station is arranged horizontally between the channel walls of the waterwheel room, as shown in Fig. 1-Fig. 3 . The sound brake fixed sections 101 located at the two outer ends are respectively fixed on the channel wall, and the adjacent butt joints between the sound brake fixed section 101, the sound brake assembly section 105 and the sound brake passage door 104 adopt double-step matching and sealed butt joints, as shown in Figure 8 . According to the size of the wall at the exit of the waterwheel room, the frontal width (6300mm), height (2500mm) and sound-absorbing channel length (1100mm) of the acoustic brake are designed. The sound brake adopts a combination of double sound insulation doors and internal sound absorption space, and the span of the two sound insulation doors is 1100mm. There is a 1.5m wide soundproof passage door on the right side of the soundproof door, which is convenient for personnel and equipment to enter and exit. Double steps are used for sound insulation between the door and the door frame, and a sealing strip is installed to make the door easy to open and close without affecting the sound insulation performance. . The door is relatively heavy, so a reinforced connection is also made on the door shaft, which can not only ensure the sound insulation performance, but also not wear the door shaft. The upper part of the sound brake is designed with a soundproof observation window 103, which is convenient for observing the operation of the internal equipment in the equipment room.

As shown in Figure 9 and Figure 10, in order to ensure that the personnel need ventilation when they are overhauling the waterwheel room, one air inlet and one outlet muffler (silence louver 102) are installed on the sound brake, and enhanced ventilation is installed inside the sound brake The amount of axial flow fan each one. The sound brake is designed to be combined and disassembled to meet the needs of overhaul. During the maintenance of the unit, the dust caused by the grinding of equipment inside the waterwheel room is easy to discharge, and the inside of the waterwheel room is used for ventilation.

The side walls of the sound brake fixing section 101, the sound brake assembly section 105 and the sound brake passage door 104 are fixed with a combined sound-absorbing sheet 111 inside the stainless steel plate 112, or a combined sound-absorbing sheet 111 is fixed on the channel side wall of the ventilation and sound-absorbing system.

Referring to Fig. 4 and Fig. 5, the combined sound-absorbing sheet 111 includes a micro-perforated sound-absorbing panel 117 on the inner layer and three layers of low-frequency damping and sound-insulating layers, which are respectively the outer low-frequency damping and sound-insulating layer 114, the middle layer of low-frequency damping and sound-insulating layer 115 and the inner layer. Layer 116 for low frequency damping sound insulation. 304 stainless steel plate is selected for the outer sound insulation board, and three layers of low-frequency damping sound insulation layers are pasted in sequence on the inner side. The three layers of low-frequency damping and sound insulation layers are located inside the stainless steel plate 112 and wrap the stainless steel keel 113 .

Referring to Figure 6, the low-frequency damping and sound-insulating layer is a rectangular or splicable convex-convex structure, including a corrugated support mesh 118 in the center, and a sound-insulating cotton 119 of equal thickness is arranged on the outside of the support mesh 118, and on the inside of the support mesh 118 A flat rubber powder polystyrene particle layer 120 of equal thickness is provided, and the rest is an adhesive layer of rubber particles 121 . The sound-proof cotton 119 is made of environmentally friendly polyester fiber sound-absorbing cotton, and the micro-perforated sound-absorbing panel 117 is made of micro-perforated aluminum sound-absorbing panels. design.

Wherein, the corrugations of the corrugated support mesh 118 are regular corrugations with equal wavelengths, and the wavelength of the at least two low-frequency damping and sound-insulating layers gradually increases from the inside to the outside of the regular corrugated support mesh 118 . Alternatively, the corrugations of the corrugated support mesh 118 are irregular corrugations with unequal wavelengths, and the average wavelength of the irregular corrugated support mesh 118 gradually increases from the inside to the outside of the at least two layers of low-frequency damping and sound insulation layers.

Referring to Fig. 7, an overlapping structure is adopted between adjacent low-frequency damping and sound-insulating layers, that is, the supporting mesh 118, sound-insulating cotton 119 and flat rubber powder polystyrene particle layer 120 in the adjacent low-frequency damping and sound-insulating layers are overlapped and pasted on each other respectively. Together.

A soundproof observation window 103 is provided to facilitate the observation of the operation of the internal equipment in the equipment room. The double-layer glass is pasted with sound-proof film in the middle. The thickness of the two-layer glass must conform to the noise spectrum characteristics, and a micro-angle angle is formed between the two layers of glass to prevent the coupling effect and maximize the sound insulation performance.

Embodiment 2: A method for manufacturing a sound-insulating wall for the sound brake device described in Embodiment 1.

First make the low-frequency damping sound insulation layer: fix the sound insulation cotton 119 of equal thickness on the surface side of the support mesh 118 of the plane, and then place the support mesh 118 and the sound insulation cotton 119 together in the mold, so that the side of the support mesh 118 is upward, Add flat rubber powder polystyrene particles into the mold and add adhesive to stir evenly and spread it flat. Before solidification and hardening, corrugate the combination of support net and sound insulation cotton 119 and flat rubber powder polystyrene particle layer 120. Make it into regular or irregular corrugation.

Rubber particles 121 are used to level the surface on both sides of the combination. The process is: place the corrugated combination in the mold, add rubber particles 121 containing adhesive and level the surface. After the glue solidifies, turn the other side up again. Put it into a mould, add rubber particles 121 containing an adhesive, and level the surface to form a rectangular or convex-convex planar plate that can be spliced.

Production of combined sound-absorbing sheet 111: combined sound-absorbing sheet 111 is to paste micro-perforated sound-absorbing panels 117 on the inner side of at least two low-frequency damping and sound-insulating layers; a lap structure is adopted between adjacent low-frequency damping and sound-insulating layers, that is, adjacent The supporting mesh 118, the sound-insulating cotton 119 and the flat rubber powder polystyrene particle layer 120 in the low-frequency damping and sound-insulating layer are overlapped and pasted together.

Fix the combined sound-absorbing sheet 111 on the inner side of the stainless steel plate 112; the outer low-frequency damping and sound-insulating layer is pasted and fixed together with the stainless steel plate 112; the inner side of the stainless steel plate 112 is provided with a keel for strengthening the structure, and all or part of the low-frequency damping and sound-insulating The layer is wrapped on the surface of the stainless steel keel 113.

Claims (10)

1. A combined protective sound brake device for a pumped storage power station, characterized in that it comprises a sound brake fixed section, a sound brake assembly section, a sound brake passage door and a closed sound insulation body surrounded by a sound insulation wall on the top floor, and the sound brakes at both ends The fixed sections are respectively fixed on the channel wall, and the sound brake assembly section and the sound brake fixed section are assembled for sound insulation; a ventilation and noise reduction system is also provided; the side walls of the sound brake fixed section, sound brake assembly section and sound brake passage door are A combined sound-absorbing sheet is fixed on the inner side of the stainless steel plate. The combined sound-absorbing sheet includes a micro-perforated sound-absorbing panel on the inner layer and at least two layers of low-frequency damping and sound-insulating layers. The low-frequency damping and sound-insulating layer is located inside the stainless steel plate and wraps the stainless steel keel; The damping and sound insulation layer is a rectangular or splicable convex-concave structure, including a corrugated support mesh in the center, sound-insulating cotton of equal thickness is arranged on the outside of the support mesh, and flat rubber powder of equal thickness is arranged on the inside of the support mesh. Benzene particle layer, and the rest are rubber particle adhesive layers. 2. The combined protective sound brake device of a pumped storage power station according to claim 1, wherein the corrugations of the corrugated support mesh are regular corrugations with equal wavelengths, and the at least two layers of low-frequency damping sound insulation layers, The wavelength of the regular corrugated support mesh gradually increases from the inside to the outside. 3. The combined protective sound brake device of a pumped storage power station according to claim 1, wherein the corrugations of the corrugated support mesh are irregular corrugations with unequal wavelengths, and the at least two layers of low-frequency damping and sound insulation layer, the average wavelength of the irregular corrugated support mesh gradually increases from the inside to the outside. 4. The combined protective sound brake device of a pumped storage power station according to claim 1, characterized in that an overlapping structure is adopted between adjacent low-frequency damping and sound-insulating layers, that is, the adjacent low-frequency damping and sound-insulating layers are The supporting mesh, the sound insulation cotton and the flat rubber powder polystyrene particle layer are overlapped and pasted together. 5. The combined protective sound brake device of a pumped storage power station according to claim 1, wherein a soundproof observation window is provided at the sound brake assembly section or the sound brake passage door. 6. The combined protective sound brake device of the pumped storage power station according to claim 1, characterized in that, a sound-absorbing louver is arranged at the tuyere of the ventilation and sound-absorbing system; piece. 7. The combined protective sound brake device of the pumped storage power station according to claim 1, characterized in that the connection between the sound brake fixed section, the sound brake assembly section and the sound brake passage door adopts double-step matching Sealed butt. 8. The combined protective sound brake device of the pumped storage power station according to claim 1, wherein the sound-insulating cotton is made of environmentally friendly polyester fiber sound-absorbing cotton. 9. The combined protective sound brake device of a pumped storage power station according to claim 1, wherein the micro-perforated sound-absorbing panel is a micro-perforated aluminum sound-absorbing panel, and the perforation rate of the micro-perforated aluminum sound-absorbing panel is equal to The aperture is designed according to the 1/3 octave of the center frequency of 500Hz. 10. A method for manufacturing a sound insulation wall for a pumped storage power station sound brake device, characterized in that, First make the low-frequency damping sound insulation layer: fix the sound insulation cotton of equal thickness on the surface side of the flat support mesh, then place the support mesh with the sound insulation cotton in the mold, make the side of the support mesh upward, and add flat into the mold Rubber powder polyphenylene particles are mixed with adhesive, stirred evenly and paved. Before solidification and hardening, corrugate the combination of support net, sound insulation cotton and flat rubber powder polystyrene particle layer to make it regular or irregular. Corrugated; rubber particles are used to level the surface on both sides of the combination. The process is: place the corrugated combination in the mold, add rubber particles containing adhesive and level the surface, and turn the other side up after the glue solidifies Put it into the mold again, add rubber particles containing adhesive and level the surface to form a rectangular or convex-convex flat plate that can be spliced; Production of combined sound-absorbing sheet: combined sound-absorbing sheet is to paste micro-perforated sound-absorbing panels on the inner side of at least two low-frequency damping and sound-insulating layers; a lap joint structure is used between adjacent low-frequency damping and sound-insulating layers, that is, the adjacent low-frequency damping and sound-insulating layers are The support mesh, sound insulation cotton and flat rubber powder polystyrene particle layer in the sound layer are overlapped and pasted together; Fix the combined sound-absorbing sheet on the inner side of the stainless steel plate; the outer low-frequency damping and sound-insulating layer is pasted and fixed together with the stainless steel plate; the inner side of the stainless steel plate is provided with a keel for strengthening the structure, and all or part of the low-frequency damping and sound-insulating layer is wrapped in stainless steel Keel surface.