CN106373759A - Noise-reduction protective apparatus for power distribution transformer - Google Patents

Abstract

The invention provides a noise reduction protection device for a power distribution transformer, which belongs to the technical field of transformers. It includes side walls, top plates and support beams. The side walls include foam concrete walls and PVC panels from outside to inside. The outer sides of the foam concrete walls are coated with transparent waterproof materials, and the inner sides of the PVC panels are coated with shielding paint. There is a gap between the concrete wall and the PVC board, and a closed cavity is set inside the gap, and the surrounding side of the closed cavity is filled with thermal insulation materials. The closed cavity is connected with the protective cavity through a number of threaded holes. Mechanism, the air injection mechanism includes an air injection pipe that is matched with the threaded hole, the airtight cavity is connected to the air supply mechanism, an exhaust mechanism is arranged on the top plate, and a temperature monitoring module and a smoke monitoring module are arranged in the protective cavity. The device of the invention has good shielding effect, has good shielding effect, reduces the outward propagation of noise, and effectively prevents fire and cools down.

Description

Noise reduction protection device for distribution transformer

technical field

The invention belongs to the technical field of transformers, and in particular relates to a noise reduction protection device for distribution transformers.

Background technique

A transformer is a static electrical device that converts an AC voltage (current) of a certain value into another voltage (current) with the same frequency or several different values through electromagnetic coupling. In the long-distance power transmission, the transformer plays an important role. On the one hand, the transformer boosts the voltage to send the power to the power-consuming area, and on the other hand, the transformer reduces the voltage to the voltage used at all levels to meet the needs of users. In recent years, with the improvement of people's living standards, the electricity consumption of residents has increased rapidly, resulting in the increase of transformers in residential areas. At present, the location of transformers is basically located next to residential buildings or in buildings, and more and more large and medium-sized transformers are used in residential areas or public places.

The noise generated by the transformer has brought great troubles to people. The transformer is mainly composed of five parts: iron core, winding with insulation, transformer oil, oil tank and insulating bushing. During the working process of the transformer, the silicon steel sheet constituting the iron core will undergo magnetostriction under the action of the alternating magnetic field, causing the iron core to vibrate periodically with the change of the excitation frequency; and the electromagnetic force and leakage magnetic field generated by the passing current in the winding , causing the structural components to vibrate. These all lead to the generation of transformer noise, and the generated noise spreads to all directions, which greatly affects the lives of the surrounding residents. Existing outdoor transformers often use traditional sound insulation and sound absorption technologies such as sound barriers and semi-sound insulation covers for noise control. In the case of very close residential areas, it is very difficult to meet the relevant noise limit standards and bring other problems. question. For example, building a very high sound barrier may affect the lighting and ventilation of nearby residential buildings, and the cost of the steel structure of the barrier is high, etc. To greatly reduce noise, substations often build houses, and place transformers in closed spaces, that is, indoors.

The patent with the application number 201410562513.1 discloses a noise-insulating room, which includes a side wall made of sound-absorbing panels and a roof covering the side walls made of sound-absorbing panels. The roof and the side walls connect. The side wall and the top are composed of sound-absorbing and insulating boards. When the noise generated by the transformer propagates to the surroundings, the side wall and the top can absorb the noise and prevent the propagation of the noise, thereby avoiding the outward propagation of the transformer noise. Reduce the noise pollution caused by the transformer, and alleviate the disturbance of the transformer noise to the lives of the surrounding residents. The structure of the noise isolation room is simple, and the sound insulation is realized by setting the sound insulation board, and the overall sound insulation effect is average. The patent with application number 201610115798.3 discloses an indoor transformer ventilation and noise reduction device, which includes: ventilation louvers and axial fans for ventilation and heat dissipation to ensure safe and stable operation of indoor transformers; multi-channel active ventilation louvers Control systems, mounted outside the ventilation louvers; single- or multi-channel active control systems for axial fans, mounted outside the axial fans. Ventilation shutters and axial flow fans ensure the ventilation and heat dissipation of indoor transformers, and the active control system suppresses the noise radiated from indoor transformers from the ventilation and heat dissipation channels. The invention reduces the damage of the transformer by strengthening the ventilation and heat dissipation, and at the same time takes into account the noise problem caused by the ventilation and heat dissipation. However, the noise problem generated by the transformer itself has not been effectively solved.

Contents of the invention

In view of this, the object of the present invention is to provide a noise reduction protection device for a transformer, which has a good shielding effect, reduces the outward propagation of noise, and effectively prevents fire and cools down.

To achieve the above object, the technical solution adopted in the present invention is:

A noise reduction protection device for a distribution transformer, comprising a side wall, a top plate and a support beam, the top plate is covered on the upper part of the side wall, and together with the side wall constitutes a protective cavity of the transformer, the side wall A door opening and a door panel matched with the door opening are provided. The side wall includes a foam concrete wall and a PVC board from the outside to the inside. The outer surface of the foam concrete wall is coated with a transparent waterproof material. The PVC board The inner surface is coated with shielding paint, there is a gap between the foam concrete wall and the PVC board, and a closed cavity is arranged inside the gap, and the surrounding side of the closed cavity is filled with thermal insulation materials, and the closed cavity is passed through several threads. The hole communicates with the protective cavity, the threaded hole is arranged obliquely, the threaded hole is connected to the air injection mechanism, and the air injection mechanism includes an air injection pipe that is connected with the threaded hole, and the end of the air injection pipe is provided with a nozzle. An air injection hole is arranged on the nozzle, the airtight cavity is connected with an air supply mechanism, an exhaust mechanism is arranged on the top plate, the exhaust mechanism includes an exhaust port and an exhaust pipe, and barbed wire is set at the exhaust port, so A temperature monitoring module and a smoke monitoring module are arranged in the protective cavity, and the temperature monitoring module and the smoke monitoring module are connected with the air supply mechanism.

Preferably, the inner surface of the PVC board has thorn-like protrusions, the height of the thorn-like protrusions is 5-8 mm, and the width is 0.5-1.2 cm.

Preferably, the top plate is made of a plastic waterproof board, and an aluminum honeycomb porous sound-absorbing board is arranged on the inner side of the plastic waterproof board. The perforation rate of the aluminum honeycomb porous sound-absorbing board is 12-20%, and the aperture is 2.0-2.5 mm .

Preferably, the plastic waterproof board is two pieces, which are arranged obliquely on the upper part of the side wall, and a passage is reserved between the two plastic waterproof boards, and a protective cover is provided on the outside of the plastic waterproof board corresponding to the passage, The protective cover is connected with the plastic waterproof board through a spring telescopic rod, and the inside of the plastic waterproof board is fixed with a reel, and the end of the reel is provided with an insulating handle, and the protective cover is connected with the reel through a flexible piece. The flexible member can roll around the reel under the action of the handle.

Preferably, the shielding coating is prepared from the following raw materials in parts by weight: 30-40 parts of polyurethane prepolymer, 3-5 parts of N-methylolacrylamide, 4-5 parts of acrylate, 0.5 parts of potassium silicate ~1 part, 1~2 parts of nano aluminum oxide, 5~10 parts of bentonite, 2~5 parts of diatomaceous earth, 2~3 parts of mica powder, 2~5 parts of lignocellulose, 10~ 15 parts, 0.1-0.3 parts of oxyethylene polyoxypropanolamine ether, 0.1-0.3 parts of ethylene glycol, 8-12 parts of water.

Preferably, the gas supply mechanism includes an air supply module and an inert gas supply module, the air supply module and the inert gas supply module are respectively connected to the controller, and the air supply module and the inert gas supply module are connected to each other through a solenoid valve. The cavity is connected, the electromagnetic valve is connected with the controller, and the controller is connected with an alarm.

Preferably, the air supply module includes a filter screen, an air pump, and a cooling cavity connected in sequence, and the cooling module is arranged in the cooling cavity.

Preferably, the inert gas supply module includes a gas storage tank for storing inert gas.

Compared with the prior art, the present invention has the following beneficial effects:

Aiming at the current situation of transformer noise pollution, the present invention designs a noise reduction protection device with good sound insulation effect. By setting the noise reduction protection device of the present invention outside the transformer, the noise generated by the transformer can be reduced as much as possible in the device. Consumption, attenuation, while not affecting the normal operation of the transformer. The foam concrete wall is a new type of building energy-saving material that is waste-recycling, environmentally friendly, energy-saving, low-cost and non-combustible. It also has excellent sound insulation performance. It is coated with waterproof materials to enhance its overall waterproof performance. PVC board has excellent chemical stability and corrosion resistance, fire-resistant and flame-retardant, high strength, coated with shielding paint on its inner side, which can improve the sound-absorbing effect of the inner lining and reduce the transmission of noise. Moreover, a gap is reserved between the foam concrete wall and the PVC board, and a closed cavity is set in the gap. The closed cavity is connected to the air supply mechanism, and the external air or cold air or inert gas is filled into the protective cavity through the air injection mechanism to realize exhaustion. The role of ventilation or cooling or fire extinguishing. In the present invention, the external air contacts with the electric device in the protective cavity to exchange heat, and the cooling effect is better. The exhaust mechanism is set on the top plate to discharge the incoming gas, and the gas will heat up in the protective cavity, so the exhaust mechanism is set on the top of the protective cavity, and the barbed wire mesh at the exhaust port plays the role of electromagnetic shielding to avoid electromagnetic The shielding is not complete, which will affect the outside world; after the cold air enters the protective cavity to cool down the power device, the temperature itself will definitely rise, and the exhaust mechanism is located at the top to facilitate the circulation of the gas. The temperature monitoring module in the airtight cavity can monitor the temperature in the protective cavity, and the temperature sensor can be used. The smoke monitoring module can use the smoke sensor to monitor in time whether there is a delay in the protective cavity. The cooperation of the two can not only realize the temperature control. Monitoring can also monitor whether a fire has occurred, which is convenient for the air supply mechanism to control. When the protective cavity needs to be ventilated, it provides external air. When it needs to cool down, the external air is cooled and then filled into the protective cavity. When the protective cavity When a fire breaks out in the cavity, the inert gas is filled in and the oxygen is isolated inside, which can prevent the occurrence of the fire and provide time for rescue.

The inner surface of the PVC board of the present invention has thorn-like protrusions to enhance the sound-absorbing effect, taking into account the simplicity of production, the thorn-like protrusions are designed as an umbrella-shaped symmetrical structure, and the height and distance of the thorn-like protrusions are limited according to field exploration experiments , in order to achieve a more ideal noise reduction effect. As mentioned above, the shielding paint can be filled between the foam concrete wall and the PVC board, and the shielding paint has multiple effects such as sound absorption, fire prevention and electromagnetic shielding. Through experiments, the present invention finds that when the width of the two is reserved for 0.8-1.2 cm and filled with sound-absorbing cotton, the sound-absorbing effect is better. Further, in order to enhance the waterproofness of the device, a waterproof plastic plate is used to enhance the sound-absorbing performance of the top. The present invention sets an aluminum honeycomb porous sound-absorbing panel on the inner side of the waterproof plastic plate. It is determined by experiments that the perforation rate of the aluminum honeycomb porous sound-absorbing panel is When the hole diameter is 12~20%, the sound absorption effect is more prominent when the hole diameter is 2.0~2.5mm. On this basis, in order to enhance the ventilation performance, this device designs the top plate to be composed of two plastic waterproof boards. The two plastic waterproof boards are opposite but not connected. A channel is reserved in the middle, and a protective cover is set corresponding to the channel. At the same time, the protective cover and the top plate are connected by spring telescopic rods. The purpose is that when ventilation and cooling are required, the protective cover can be raised to communicate with the outside world. When ventilation is not required, the protective cover only needs to be lowered. , reduce or even completely cover the passage, so that it does not communicate with the outside world; and in order to realize the rise and fall of the protective cover, the device is provided with a fixed reel and a handle connected with the protective cover by a flexible piece.

In addition, the present invention also optimizes and improves the shielding paint coated on the inner side of the PVC board to enhance the sound absorption performance and the bonding performance with the PVC board. The polyurethane prepolymer described in the present invention is formed by polymerizing isocyanate and polyether as the main raw materials. The prepolymer with NCO end groups has a molecular weight between 4000 and 10000; N-methylolacrylamide It is a white crystalline powder with a melting point of 74-75°C, easily soluble in water and ethanol, soluble in fatty acid esters, insoluble in hydrophobic solvents such as hydrocarbons and halogenated hydrocarbons; potassium silicate, colorless or slightly yellow, translucent to transparent Glass-like substance; nano-alumina, which has excellent insulating properties and can adjust the fluidity of the paint; bentonite, which forms flocculent substances in water, has a thickening effect, and its molecular groups can combine with the organic base material in the paint , can enhance the water resistance of the coating, improve the strength and adhesion of the coating, and the effect of using nano-bentonite is better; diatomaceous earth can enhance the absorption performance and porosity of the coating; mica powder is the functional filler of the coating , can improve its mechanical strength, enhance toughness, adhesion, anti-aging and corrosion resistance, etc.; lignocellulose has a natural pore-forming structure and a large number of irregular voids, which can effectively absorb sound energy, reduce noise, and eliminate noise; Ethylene glycol butyl ether, is glycol ether ester solvent, can be used as the coalescence aid of latex paint, and it has excellent dissolving performance to multiple paints; Oxyethylene polyoxypropanolamine ether has in the present invention The effect of the defoaming agent has good coordination performance with the coating; the addition of ethylene glycol in the coating can reduce the sensitivity of the coating to temperature, making the coating more stable in a wide range of temperature fluctuations; water, As a solvent of this paint, it can enhance the environmental protection of paint production. Through the matching and optimization of the above-mentioned materials and proportions, the absorption coefficient of the obtained sound-absorbing material is obviously increased, and it is environmentally friendly and pollution-free, and has an ideal bonding and fixing effect with the PVC board.

Description of drawings

Below in conjunction with accompanying drawing, the present invention is described in further detail;

Fig. 1: the structural representation of the noise reduction protective device of distribution transformer of the present invention;

Fig. 2: the partial enlarged view of Fig. 1 of the present invention;

Fig. 3: the structural representation of air supply mechanism of the present invention;

Figure 4: Schematic diagram of the structure of the thorn-like protrusion of the present invention;

Figure 5: Schematic diagram of the structure of Embodiment 3 of the present invention;

Figure 6: a schematic structural view of Embodiment 4 of the present invention;

Among them: 1-side wall, 2-roof, 3-support beam, 4-foam concrete wall, 5-PVC board, 6-shielding coating, 7-gap, 8-refrigeration module, 9-protective cavity, 10- Spike-shaped protrusion, 11-air storage tank, 12-aluminum honeycomb porous sound-absorbing panel, 13-channel, 14-protective cover, 15-spring telescopic rod, 16-reel, 17-handle, 18-flexible piece, 19-auxiliary Beam, 20-transformer, 21-closed cavity, 22-insulation material, 23-threaded hole, 24-jet pipe, 25-nozzle, 26-jet hole, 27-exhaust port, 28-exhaust pipe, 29- Barbed wire, 30-temperature monitoring module, 31-smoke monitoring module, 32-air supply module, 33-inert gas supply module, 34-controller, 35-solenoid valve, 36-alarm, 37-filter, 38-air pump , 39-cooling cavity.

detailed description

In order to better understand the present invention, the content of the present invention is further clearly described below in conjunction with the examples, but the protection content of the present invention is not limited to the following examples. In the following description, numerous specific details are given in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without one or more of these details.

Embodiment 1: Referring to Figures 1 to 3, a noise reduction protection device for a distribution transformer includes a side wall 1, a top plate 2 and a support beam 3, the top plate 2 is covered on the upper part of the side wall 1, and the The side wall 1 together constitutes the protective cavity 9 of the transformer 20. The side wall 1 is provided with a door opening and a door panel matched with the door opening. The side wall 1 includes a foam concrete wall 4 and PVC board 5, the outer side of the foamed concrete wall 4 is coated with transparent waterproof material, the inner side of the PVC board 5 is coated with shielding paint 6, there is a gap 7 between the foamed concrete wall 4 and the PVC board 5 , the inside of the gap is provided with a closed cavity 21, the surrounding side of the closed cavity is filled with thermal insulation material 22, and the closed cavity communicates with the protective cavity through a number of threaded holes 23, and the threaded holes are arranged obliquely. The threaded hole is connected to the air injection mechanism, and the air injection mechanism includes an air injection pipe 24 that is connected with the threaded hole. The end of the air injection pipe is provided with a nozzle 25, and the nozzle is provided with an air injection hole 26. The airtight cavity is connected to An air supply mechanism, an exhaust mechanism is arranged on the top plate, the exhaust mechanism includes an exhaust port 27 and an exhaust pipe 28, the exhaust port is provided with a barbed wire 29, and a temperature monitoring module 30 and a smoke A monitoring module 31, the temperature monitoring module and the smoke monitoring module are connected with the air supply mechanism.

In this embodiment, the device is symmetrical about the center line, and door openings and door panels can be arranged on any side wall 1 as required. The side walls 1 form a square structure, which facilitates the installation and layout of the top plate 2 .

Refer to Figure 1, the threaded holes can be set according to the needs, and it is advisable to set 1~2 within 5 square meters.

Referring to Figure 2, the nozzle is conical to intervene in the jet flow direction and speed.

Referring to Fig. 3, the gas supply mechanism includes an air supply module 32 and an inert gas supply module 33, the air supply module and the inert gas supply module are connected to the controller 34 respectively, the air supply module and the inert gas supply module The electromagnetic valve 35 is connected with the cavity, the electromagnetic valve is connected with the controller, and the controller is connected with an alarm 36 . In order to meet the functions of ventilation, cooling and fire extinguishing, the cavity is connected to the air supply mechanism through a solenoid valve, and the solenoid valve is controlled by the controller. When only ventilation is required, the air supply module sucks in the outside air, and when cooling is required , the air supply module cools the inhaled air, and then sends it into the cavity. When it is necessary to extinguish the fire, the solenoid valve shuts off the connection between the air supply module and the cavity, and connects the inert gas supply module to the cavity, filling the inert gas Into the cavity and then filled into the shell to realize the fire extinguishing function. The use is more intelligent like this, and the function of the air supply mechanism is more powerful. The alarm connected to the controller can give an alarm when the temperature rises abnormally or a fire occurs, and has the function of early warning and alarm.

Referring to FIG. 3 , in this embodiment, preferably, the air supply module includes a filter screen 37 , an air pump 38 and a cooling cavity 39 connected in sequence, and a cooling module 8 is arranged in the cooling cavity. The filter screen prevents foreign debris from being sucked into the shell, the air pump sucks in the outside air, and the cooling cavity cooperates with the cooling module to cool down the sucked air. This structure can realize the function of supplying air or cooling air. The refrigeration module can adopt the refrigeration mode of the compressor or semiconductor refrigeration.

Referring to FIG. 3 , in this embodiment, preferably, the inert gas supply module includes a gas storage tank 11 for storing inert gas. The inert gas can be carbon dioxide or nitrogen, because the amount of it is not large, it is only used when there is a situation in the shell, and the shell is a sealed environment, so it is enough to install a gas storage tank to isolate the oxygen to extinguish the fire .

Embodiment 2: Referring to Fig. 4, the noise reduction protection device of the distribution transformer described in this embodiment is improved on the basis of Embodiment 1, specifically:

The inner surface of the PVC board 5 has thorn-like protrusions 10, the height of the thorn-like protrusions 10 is 5-8 mm, and the width of the thorn-like protrusions 10 is 0.5-1.2 cm. Wherein, the height of the thorn-like protrusion 10 refers to the vertical distance between the point where the thorn-like protrusion 10 is away from the PVC board 5 and the reference plane with the PVC board 5 as the reference plane. According to actual needs, any value between 5-8 mm can be selected, for example, 5, 6, 7 or 8 mm; the height of the spinous protrusion 10 can be selected from 0.5-1.2 cm, such as 0.5 cm, 0.8 cm, 1.0 cm. Referring to Fig. 4 for the cross-section of the thorn-like protrusion 10, the base is wide, and the connecting surface with the PVC board 5 is circular. If the height and width of the thorn-like protrusions 10 are different, the coating area of the sound-absorbing material will be different, and the setting of the thorn-like protrusions 10 will cause the surface of the PVC board 5 to be uneven, which is more conducive to the consumption and weakening of sound waves, and enhances the sound-absorbing effect.

Embodiment 3: Referring to FIG. 5, the noise reduction protection device for distribution transformers described in this embodiment is improved on the basis of Embodiment 1, and can also be used in combination with Embodiment 2, specifically:

The top plate 2 is made of a plastic waterproof board, and the inner side of the plastic waterproof board is provided with an aluminum honeycomb porous sound-absorbing board 12. The perforation rate of the aluminum honeycomb porous sound-absorbing board 12 is 12-20%, and the aperture is 2.0-2.5 mm. . The aluminum honeycomb porous sound-absorbing panel 12 is set to enhance the internal sound-absorbing effect, and the perforation rate and the size of the aperture will affect the transformation of the sound wave. According to experiments, when the perforation rate of the aluminum honeycomb porous sound-absorbing panel 12 is 12-20%, The hole diameter is 2.0~2.5 mm, the sound absorption effect is better, and within the above range, the perforation rate of the aluminum honeycomb porous sound-absorbing panel 12 can be selected to be 12%, and the hole diameter is 2.0 mm; or, the perforation of the aluminum honeycomb porous sound-absorbing panel 12 The perforation rate is 15%, and the aperture is 2.2 mm; or, the perforation rate of the aluminum honeycomb porous sound-absorbing panel 12 is 20%, and the aperture is 2.5 mm.

Embodiment 4: Referring to Figure 6, the noise reduction protection device for distribution transformers described in this embodiment is improved on the basis of Embodiment 3, specifically:

The plastic waterproof board is two pieces, which are arranged obliquely on the upper part of the side wall 1, and a passage 13 is reserved between the two plastic waterproof boards, and a protective cover 14 is provided on the outside of the plastic waterproof board corresponding to the passage 13 , the protective cover 14 is connected with the plastic waterproof board through a spring telescopic rod 15, the inner side of the plastic waterproof board is fixedly provided with a reel 16, the end of the reel 16 is provided with an insulating handle 17, and the protective cover 14 is connected by a flexible The member 18 is connected to the reel 16 , and the flexible member 18 can roll around the reel 16 under the action of the handle 17 .

In this embodiment, the width and length of the protective cover 14 are respectively greater than the width and length of the channel 13 , and it is in the shape of a boat with arc-shaped ends. This makes it possible to completely cover the channel 13 . The two plastic waterproof boards are respectively fixed by the auxiliary beam 19, and the auxiliary beam 19 is vertically connected with the supporting beam 3.

Through the above design, one end of the flexible piece 18 is connected with the protective cover 14, when the flexible piece 18 rolls around the reel 16 under the action of the handle 17, a downward force is given to the protective cover 14, which forces the spring to expand and contract The rod 15 retracts, driving the protective cover 14 to move downward until the edge contacts the plastic waterproof board and stops. At this time, the handle 17 is fixed, and the protective cover 14 can be fixed so that it is in a static state. In this case, the channel 13 Closed by protective cover 14 and stop ventilation. And when the handle 17 is loosened, due to the elastic force of the spring telescopic rod 15, the protective cover 14 is subjected to an upward force, and now the flexible member 18 will slowly unfold, and the protective cover 14 moves upwards, so that the passage 13 communicates with the outside world and starts to ventilate .

Embodiments 5 to 8: The noise reduction protection device for distribution transformers described in Embodiments 5 to 8 is improved on the basis of Embodiment 1, and can also be used in combination with any of Embodiments 1 to 4, specifically:

The inner surface of the PVC board 5 is coated with a shielding paint, which is prepared from raw materials in parts by weight as shown in the following table:

Among the present invention, the preparation method of barrier paint 6 is:

1) Weigh the above raw materials by weight, mix and dissolve acrylate, ethylene glycol and water, add N-methylolacrylamide and polyurethane prepolymer in turn, control the temperature at 65~70℃, and stir for 60~70 minutes ;

2) Add potassium silicate, butyl glycol ether and lignocellulose to the reaction system in step 1), raise the temperature to 80°C within 5 minutes, and stir for 2 hours;

3) After the temperature of the reaction system obtained in step 2) is cooled to 40~45°C, add nano-alumina, bentonite, diatomaceous earth, mica powder, oxyethylene polyoxypropanolamine ether to it, rotate at 4000rpm, and stir for 45~60 Minutes, leave standstill, obtain shielding coating 6.

The shielding paint of the present invention is applied by brushing.

Through testing, the quality standard of the sound-absorbing material of the present invention conforms to the national standard GB/T9756-2001; the safety performance conforms to the national standard GB18582-2001 safety standard for interior decoration materials.

According to the standard requirements of GB/T20247-2006 "Acoustic Reverberation Chamber Sound Absorption Measurement" and the GBJ47-1983 measurement specification, the experiment determines that the sound absorption coefficient of the shielding coating of the present invention is 0.75~0.82, and for Examples 1~4, the sound absorption coefficients are respectively It is 0.82, 0.80, 0.76, 0.79.

Further combined with the national standard GB/T16731-1997 sound-absorbing performance classification of building sound-absorbing products, the noise reduction coefficient of the sound-absorbing material of the present invention can be calculated to reach the standard above Class II, and the noise reduction performance is excellent.

Comparative example 1

In this embodiment, one raw material of the sound-absorbing material is changed, and potassium silicate is replaced by a zirconium-aluminate coupling agent, the content remains unchanged, and the remaining components and content are the same as in Example 5, and the preparation method is the same as that of the present invention. With the measuring method of the present invention, the sound absorption coefficient of the sound-absorbing material is measured to be 0.58, and the noise reduction coefficient is grade III.

Although the specific embodiments of the present invention have been described above, those skilled in the art should understand that the specific embodiments we have described are only illustrative, rather than used to limit the scope of the present invention. Equivalent modifications and changes made by skilled personnel in accordance with the spirit of the present invention shall fall within the protection scope of the claims of the present invention.

Claims (8)

1. a kind of distribution transformer noise reduction protective device it is characterised in that: include side wall, top board and support beam, described top board Lid is located at the top of described side wall, collectively forms the protection cavity of transformator with described side wall, described side wall setting door opening and with The door-plate of described door opening cooperation, described side wall includes foam concrete wall and pvc plate, described foam coagulation from outside to inside successively The lateral surface coating transparent waterproof materials of cob wall body, the medial surface coating shielding coating of described pvc plate, described foam concrete wall Between body and pvc plate, there is gap, described inner space arranges closed cavity, the week side of boss filling thermal insulating material of described closed cavity Material, described closed cavity is passed through some screwed holes and is connected with described protection cavity, and described screwed hole is obliquely installed, described screwed hole Connect jet mechanism, described jet mechanism includes the air jet pipe being connected with described screwed hole, and the end of described air jet pipe sets Put shower nozzle, described shower nozzle arrange fumarole, described closed cavity connects gas supply mechanism, and described top board arranges exhaust gear, Described exhaust gear includes air vent and discharge duct, and described air vent arranges setting temperature in wire gauze, described protection cavity Monitoring modular and smoke monitoring module, described temperature monitoring module and smoke monitoring module are connected with described gas supply mechanism.

2. distribution transformer as claimed in claim 1 noise reduction protective device it is characterised in that: the medial surface of described pvc plate There is thorn-like projection, the height of described thorn-like projection is 5 ~ 8 millimeters, and width is 0.5 ~ 1.2 centimetre.

3. distribution transformer as claimed in claim 1 noise reduction protective device it is characterised in that: described top board is by plastics waterproofing Plate is constituted, the inner side setting aluminum honeycomb porous sound absorption plate of described drainage systems, the punching rate of described aluminum honeycomb porous sound absorption plate For 12 ~ 20%, aperture is 2.0 ~ 2.5 millimeters.

4. distribution transformer as claimed in claim 3 noise reduction protective device it is characterised in that: described drainage systems be two Block, is inclined at the top of described side wall, reserved passageway between two pieces of described drainage systems, outside described drainage systems Portion's described passage of correspondence arranges protective cover, and described protective cover is connected by telescopic spring bar with described drainage systems, described moulds The inner side of material splash guard is fixedly installed spool, the end setting insulation handle of described spool, described protective cover pass through flexible piece with Described spool connects, and described flexible piece can be around described reel convolution in the presence of described handle.

5. distribution transformer as claimed in claim 1 noise reduction protective device it is characterised in that: described shielding coating, by with The raw material of lower weight portion is prepared from: 30 ~ 40 parts of base polyurethane prepolymer for use as, 3 ~ 5 parts of n- n-methylolacrylamide, acrylate 4 ~ 5 Part, 0.5 ~ 1 part of potassium silicate, 1 ~ 2 part of nano-aluminium oxide, 5 ~ 10 parts of bentonite, 2 ~ 5 parts of kieselguhr, 2 ~ 3 parts of mica powder, wood 2 ~ 5 parts of matter cellulose, 10 ~ 15 parts of butyl glycol ether, 0.1 ~ 0.3 part of oxygen ethylene polyoxy propanol amidogen ether, 0.1 ~ 0.3 part of ethylene glycol, 8 ~ 12 parts of water.

6. distribution transformer as claimed in claim 1 noise reduction protective device it is characterised in that: described gas supply mechanism includes sky Gas supply module and noble gases supply module, described air supply module and noble gases supply module are respectively with controller even Connect, described air supply module and described noble gases supply module are connected with described cavity by electromagnetic valve, described electromagnetic valve It is connected with described controller, described controller connects alarm.

7. distribution transformer as claimed in claim 6 noise reduction protective device it is characterised in that: described air supply module bag Include the drainage screen being sequentially connected, air pump and refrigeration cavity, setting refrigeration module in described refrigerating chamber body.

8. distribution transformer as claimed in claim 7 noise reduction protective device it is characterised in that: described noble gases supply mould Block includes storing the air accumulator of noble gases.