CN204267970U - A kind of combined type huge discharge steam evacuation silencing apparatus - Google Patents

Abstract

The utility model relates to a composite large-displacement steam venting muffler, which belongs to the field of environmental engineering. It includes a sound-absorbing and insulating composite shell, an injection diffuser multi-stage noise-absorbing structure as an inner tank, and a resistive sound-absorbing sheet; the sound-absorbing and insulating composite shell is composed of steel plates, rock wool, and stainless steel plate sound-insulating layers from outside to inside. , stainless steel wire wool and stainless steel perforated plate; the multi-stage muffler structure of the injection diffuser includes a plurality of cylindrical muffler tubes with different diameters, which are divided into multiple layers according to the order of the diameter of the cylindrical muffler tubes from large to small Installation; the end of the cylindrical muffler pipe is closed with a ring baffle. The utility model composite large-displacement steam venting muffler has the characteristics of large interface, good noise reduction effect, beautiful appearance, safety and applicability, and low comprehensive cost. After a number of comprehensive tests and on-site implementation by users, the utility model has a good response. Very good promotion and practical value, after extensive promotion and application will produce good economic and social benefits.

Description

A Composite Large Displacement Steam Vent Muffler

technical field

The utility model relates to a composite large-displacement steam venting muffler, which belongs to the field of environmental engineering.

Background technique

Exhaust venting noise is generally produced by the instability of high-speed airflow. The flowing airflow generally has the characteristics of high temperature, high pressure, and high flow rate. It is an important noise source in industrial production such as fossils, petroleum, electric power, and metallurgy. The noise emitted by it has the characteristics of high intensity, wide frequency spectrum and wide range of noise influence. At present, the small hole injection muffler is one of the main forms to eliminate the exhaust noise. The small-hole injection muffler is a muffler pipe with the same diameter as the original exhaust port and a closed end. There are many small exhaust holes on the pipe wall. The total area of the small holes should generally be larger than the area of the original exhaust port. The smaller the hole diameter, the better the effect of reducing exhaust noise. However, the noise generated by a single small-hole injection muffler is relatively large-displacement steam pipe. Due to the large diameter of the steam pipe, the corresponding small hole cannot reach a certain effective diameter, so the noise reduction effect is not obvious.

Contents of the invention

In order to overcome the disadvantage that the small-hole injection muffler has no obvious noise reduction effect for large-displacement and large-diameter, the utility model provides a composite large-displacement steam-venting muffler. In order to solve the high-pressure steam flow and strong noise generated when large-displacement high-pressure steam is discharged to the outside, it uses the principle of multi-layer small hole injection as the inner tank of the equipment, and a resistive sound-absorbing sheet is installed at the gas outlet of the muffler to form a Composite noise reduction structure can effectively reduce the strong noise of high-pressure steam in large-displacement pipelines.

In order to achieve the above object, the utility model adopts the following technical solutions:

A composite large-displacement steam venting muffler, which includes a sound-absorbing and insulating composite shell, a multi-stage sound-absorbing structure of an injection diffuser as an inner tank, and a resistive sound-absorbing sheet;

The sound-absorbing and insulating composite shell is sequentially composed of steel plate, rock wool, stainless steel plate sound insulation layer, stainless steel wire wool and stainless steel perforated plate from outside to inside;

The multi-stage muffler structure of the injection diffuser includes a plurality of cylindrical muffler pipes with different diameters, which are installed in multiple layers according to the order of diameter of the cylindrical muffler pipes from large to small;

The end of the cylindrical muffler pipe is closed with a circular baffle.

A plurality of small holes are arranged on the side wall of the cylindrical muffler pipe.

The resistive muffling sheet is installed on the muffling sheet fixing groove at the outlet end of the device, and the resistive muffling sheet includes the muffling sheet and the wind guide cone at the bottom of the muffling sheet.

A drain valve is installed at the bottom of the device.

The inner wall of the sound-absorbing and insulating composite shell is coated with a damping coating material.

The inner liner is made of a variety of small-hole stainless steel plates with different apertures rolled into cylinders of different diameters, installed in the muffler in multiple layers according to the plate thickness, aperture and diameter of the cylinder, and the end of the cylinder is closed so that the airflow from the cylinder It is ejected from the small hole of the body; a resistive sound-absorbing sheet with a certain amount of sound-absorbing capacity is installed at the outlet of the device, and the resistive sound-absorbing sheet is composed of a stainless steel perforated plate, a porous suction sheet material and a steel keel; in order to avoid high-pressure steam The water vapor generated in the muffler is accumulated in the device, and a drain valve is installed at the bottom of the device; it is connected with the drain pipe. In order to facilitate the connection with the high-pressure steam pipeline, an interface flange corresponding to the diameter of the pipeline is installed at the interface of the device. Through the combination of the above multiple acoustic structures, the high-intensity noise generated when the steam pipe is discharged into the space can be effectively reduced.

The beneficial effects of the utility model:

The utility model composite large-displacement steam venting muffler has the characteristics of large interface, good noise reduction effect, beautiful appearance, safety and applicability, and low comprehensive cost. After a number of comprehensive tests and on-site implementation by users, the utility model has a good response. Very good promotion and practical value, after extensive promotion and application will produce good economic and social benefits.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is a schematic diagram of the structure of Fig. 1A-A;

Fig. 3 is a schematic structural diagram of Fig. 1A.

Detailed ways

The utility model is described in detail below in conjunction with accompanying drawing:

The principle of the utility model device is mainly based on the theory of "small hole injection" and the noise reduction effect of impedance type expansion and sound absorption.

It includes a sound-absorbing and insulating composite shell, an injection diffuser multi-stage sound-absorbing structure as an inner tank, and a resistive sound-absorbing sheet;

The sound-absorbing and insulating composite shell is sequentially composed of steel plate 10, rock wool 11, stainless steel plate sound-insulating layer 12, stainless steel silk wool 13 and stainless steel perforated plate 14 from outside to inside;

The multi-stage muffler structure of the injection diffuser includes a plurality of cylindrical muffler pipes 7 with different diameters, which are installed in multiple layers according to the order of the diameters of the cylindrical muffler pipes 7 from large to small;

The end of the cylindrical muffler pipe 7 is closed with a ring baffle 17 .

A plurality of small holes are arranged on the side wall of the cylindrical muffler pipe 7 . So that the air flow is ejected from the small hole of the cylinder; the principle of the small hole injection muffler is to reduce its interference noise from the sound mechanism. The peak frequency of injection noise is inversely proportional to the nozzle diameter, that is, the noise energy radiated by the nozzle will shift from low frequency to high frequency as the nozzle diameter becomes smaller. If the aperture is sufficiently small, the injection noise will shift to a frequency range where the human ear is not sensitive. According to this principle, a large nozzle is replaced by many small holes, and the purpose of reducing the audible sound can be achieved under the condition of maintaining the same exhaust volume. In a general exhaust vent, the diameter of the exhaust pipe is several centimeters, the peak frequency is low, and the radiated noise is mainly within the hearing threshold of the human ear. The small hole diameter of the common small hole injection muffler is 1 ~ 2.5mm, and its peak frequency is dozens or hundreds of times higher than that of ordinary exhaust pipe injection noise, which moves the injection noise to the ultrasonic range.

The resistive muffling sheet is installed on the muffling sheet fixing groove 24 at the outlet end of the device, and the resistive muffling sheet includes the muffling sheet 22 and the wind guide cone 21 at the bottom of the muffling sheet 22 . The resistive muffler is composed of stainless steel perforated plate, porous sound-absorbing material and steel keel; the resistive muffler uses the porous sound-absorbing material laid in the airflow channel to absorb sound energy and reduce noise to play the role of muffler. When the sound wave passes through the pipeline lined with porous sound-absorbing material, the sound wave will excite the vibration of air molecules in numerous small holes in the porous material. Part of the sound energy will be used to overcome frictional resistance and viscous force, and become heat energy. Generally speaking, the resistive noise reduction device has good middle and high frequency noise reduction performance, but the low frequency performance is poor. However, as long as the thickness and density of the sound-absorbing material are properly increased, and a lower void ratio is selected, the low-intermediate frequency noise reduction performance can be greatly improved, so that a wide-band resistive noise reduction device can be made.

A drain valve 1 is installed at the bottom of the device. It is connected with the drainage pipe to remove the accumulated water in the device in extreme cases.

The inner wall of the sound-absorbing and insulating composite shell is coated with a damping coating material. In order to reduce the resonance or standing wave phenomenon of these metal outer walls.

Claims (5)

1. A composite large-displacement steam venting muffler, characterized in that: it includes a sound-absorbing and insulating composite shell, an injection diffuser multi-stage silencing structure as an inner tank, and a resistive silencing sheet; The sound-absorbing and insulating composite shell is sequentially composed of steel plate (10), rock wool (11), stainless steel plate sound-insulation layer (12), stainless steel silk wool (13) and stainless steel perforated plate (14) from outside to inside; The injection diffuser multi-stage muffler structure includes a plurality of cylindrical muffler pipes (7) with different diameters, which are installed in multiple layers according to the order of diameter of the cylindrical muffler pipes (7) from large to small; The end of the cylindrical muffler pipe (7) is closed with a ring baffle (17). 2. The composite large-displacement steam vent muffler according to claim 1, characterized in that: the side wall of the cylindrical muffler pipe (7) is provided with a plurality of small holes. 3. The composite large-displacement steam vent muffler according to claim 1, characterized in that: the resistive sound-absorbing sheet is installed on the sound-absorbing sheet fixing groove (24) at the outlet end of the device, and the resistive sound-absorbing sheet The sheet includes the sound-absorbing sheet (22) and the wind guide cone (21) at the bottom of the sound-absorbing sheet (22). 4. The composite large-displacement steam venting muffler according to claim 1, characterized in that: a drain valve (1) is installed at the bottom of the device. 5. The composite large-displacement steam vent muffler according to claim 1, characterized in that: the inner wall of the sound-absorbing and insulating composite shell is coated with a damping coating material.