CN201072305Y - Ventilation silencer for natural-draft cooling tower - Google Patents

Abstract

The utility model relates to a ventilation muffler for a natural ventilation cooling tower. The ventilation muffler comprises a square metal pipe body, and the sound-absorbing cotton and the air passage are arranged inside the pipe. In the interlayer between the metal plate on the side and the inner wall of the pipe, the metal plates on both sides of the air duct expand towards the air inlet and the air outlet respectively, and the metal plates are distributed with small sound-absorbing holes on the outlet side. The metal plates on both sides of the air duct are symmetrically flared on both sides of the air inlet, and are asymmetrically flared on both sides of the air outlet. One side of the flared is an arc, and the other side is a slope. The ventilation muffler of the utility model can optimize the flow field inside the muffler, reduce resistance, and effectively reduce noise. In addition, the sound-absorbing body is wrapped with a waterproof and anti-aging film, which has good waterproof performance and long service life.

Description

Natural draft cooling tower ventilation muffler

technical field

The utility model relates to a ventilation muffler for reducing the water spray noise of a hyperbolic natural ventilation cooling tower of a power plant.

Background technique

The noise emitted by the natural ventilation cooling tower is mainly the sound of water splashing. In the process of water falling from a high place, the energy is converted from potential energy to kinetic energy. noise.

At present, there are more than a thousand large-scale hyperbolic natural cooling towers in large-scale thermal power plants in my country. The sound source intensity is between 72 and 88dB(A), and there is a certain intensity of noise pollution during operation. Most of the cooling towers of power plants are located close to the factory boundary, which often causes excessive noise and fails to meet the requirements of GB12348-90 "Noise Standards at Boundary of Industrial Enterprises".

The muffler is a device that allows airflow to pass through and can prevent or reduce sound transmission. Installing a ventilation muffler at the air inlet of a cooling tower is an effective method of noise reduction and has antifreeze effects. However, the commonly used ventilation muffler has a small amount of noise reduction. , large resistance coefficient, poor waterproof performance, and short service life, so it cannot be used for noise control of natural ventilation cooling towers.

Contents of the invention

In order to solve the above problems, the utility model provides a ventilation muffler, which is used for the noise control of the hyperbolic natural ventilation cooling tower, which can ensure the natural ventilation of the cooling tower while reducing the noise.

The ventilation muffler, the outer shell is a metal pipe body, the pipe is provided with sound-absorbing cotton and air duct, the sound-absorbing cotton is wrapped with waterproof film, and is respectively arranged in the interlayer between the metal plate on both sides of the air duct and the inner wall of the pipe, and the air is ventilated. The metal plates on both sides of the duct expand towards the air inlet and the air outlet respectively, and the metal plates are distributed with small sound-absorbing holes on the outlet side.

Preferably, the metal plates on both sides of the air duct are symmetrically flared on both sides of the air inlet, and asymmetrically flared on both sides of the air outlet. One side of the flared is an arc, and the other side is a slope .

More preferably, the metal pipe body of the ventilation muffler is a square pipe.

Compared with the existing mufflers, the ventilation muffler can optimize the flow field inside the muffler, reduce resistance, and effectively reduce noise. In addition, the sound-absorbing body is wrapped with a waterproof and anti-aging film, which has good waterproof performance and long service life.

Description of drawings

Figure 1 is a longitudinal sectional view of the muffler.

Among them, 1 is air duct, 2 is metal pipe, 3 is sound-absorbing cotton, 4 is waterproof film, 5 is sound-absorbing hole, 6 is metal plate, 6-1 is symmetrical curved surface flare, 6-2 is asymmetric Flaring.

Detailed ways

Embodiment of the utility model is described below in conjunction with accompanying drawing.

As shown in Figure 1, the ventilation muffler consists of a square metal pipe body 2 of hot-dip galvanized steel plate, in which there are centrifugal glass wool felt sound-absorbing cotton 3 and air duct 1, and the sound-absorbing cotton 3 is wrapped with a waterproof film 4, and respectively arranged in the interlayer between the metal plates 6 on both sides of the air duct 1 and the inner wall of the pipe body 2, the metal plates 6 on both sides of the air duct 1 expand toward the air inlet and the air outlet respectively, and the metal plates are on the outlet side Sound absorption holes 5 are distributed.

The metal plates on both sides of the air duct form symmetrical arc flares 6-1 on both sides of the air inlet, and asymmetric flares 6-2 on both sides of the air outlet. As can be seen from the figure, one side of the flare is an arc surface, and the other side is a slope, the two are asymmetrical.

When in use, the muffler is placed on the periphery of the air inlet of the cooling tower where sound insulation is required, and several ventilation mufflers are arranged in sequence and stacked up and down to form a "wall" of a certain height outside the air inlet of the cooling tower. The air outlet faces inward, facing the cooling tower, and the air inlet faces outward. When the water splashing sound comes out from the cooling tower, it passes through the metal plate sound-absorbing hole 5 at the air outlet of the ventilation muffler, and is absorbed by the centrifugal glass wool felt sound-absorbing cotton 3, thereby reducing the noise. In addition, the natural wind enters through the muffler. The tuyeres, ventilation ducts, and air outlets enter the cooling tower for cooling.

Claims (3)

1. A ventilation muffler, which contains a metal pipe body, with sound-absorbing cotton and air ducts inside the pipe, characterized in that the sound-absorbing cotton is covered with a waterproof film, and is respectively arranged between the metal plates on both sides of the air duct and the inner wall of the pipe In the interlayer between the air ducts, the metal plates on both sides of the air duct expand towards the air inlet and the air outlet respectively, and the metal plates are distributed with small sound-absorbing holes on the outlet side. 2. The ventilation muffler according to claim 1, characterized in that the metal plates on both sides of the air duct are symmetrically flared on both sides of the air inlet, and are asymmetrically flared on both sides of the air outlet. , one side of the flaring is a curved surface, and the other side is a beveled surface. 3. The ventilation muffler according to claim 1 or 2, characterized in that the metal pipe body is a square pipe.

Images