CN212250186U - A flame retardant exhaust muffler - Google Patents

Abstract

The utility model discloses a fire-resistance type exhaust muffler, which comprises a main muffler. The intake end of the main muffler is connected to the intake elbow muffler through a first expansion joint, and the exhaust end of the main muffler is connected to the exhaust through a second expansion joint. The air elbow is connected, the interior of the main muffler is sequentially provided with a first flame arrester and a second flame arrester along the air flow direction, and an oil discharge valve is arranged at the bottom end of the main muffler. The utility model has a reasonable muffling structure, good muffling effect, and can eliminate noise; for airflow, the airflow supercharged by uneven pulsating pressure is decelerated here, the peak pressure is flattened, and the airflow tends to be uniform and stable , At the same time, the fire resistance structure is appropriate, the fire resistance performance is good, and the shooting phenomenon is effectively prevented.

Description

A flame retardant exhaust muffler

technical field

The utility model relates to a muffler, in particular to a fire-blocking type exhaust muffler.

Background technique

The exhaust gas of the shunting internal combustion engine is directly discharged from the roof through a short pipe, and the noise of the exhaust port is as high as 120dB(A), which causes the shunting noise to exceed the standard seriously. The shunting train often drives in various workshops of the factory or in a certain limited area, and the high noise seriously damages the working acoustic environment in the workshop or around it. At the same time, there may be flammable substances such as CO, CH compounds, unburned oil particles and carbon particles in the exhaust gas of internal combustion engines. Under the action of high temperature, sparks may be generated and discharged into the atmosphere, posing a fire safety hazard. Therefore, we propose a resistance Fire-type exhaust muffler.

Utility model content

Aiming at the above problems, the present invention provides a fire-resisting exhaust muffler to solve the problems of high processing difficulty and high failure rate caused by the use of compression springs to open and close the valve in the current market.

In order to achieve the above purpose, the present utility model provides the following technical solutions: a flame arrester exhaust muffler, comprising a main muffler, the intake end of the main muffler is connected to the intake elbow muffler through a first expansion joint, the main muffler is The exhaust end of the muffler is connected with the exhaust elbow through the second expansion joint, the interior of the main muffler is sequentially provided with a first fire-resisting net and a second fire-resisting net along the airflow direction, and the bottom end of the main muffler is provided with Has a drain valve.

As a preferred technical solution of the present invention, the two ends of the main muffler are sealedly connected with the first expansion joint and the second expansion joint through flanges, and the first expansion joint and the second expansion joint are respectively connected to the The connection between the elbow muffler and the exhaust elbow is sealed by the flange.

As a preferred technical solution of the present invention, the end of the exhaust elbow is provided with a flame arrester, and the main body of the flame arrester is a mesh structure.

As a preferred technical solution of the present invention, the nozzles of the intake elbow muffler and the exhaust elbow and the main muffler are all bent at a degree, and the turning point is an arc bending.

As a preferred technical solution of the present invention, the first flame arrester and the second flame arrester are divided into three chambers inside the main muffler, and four mufflers are installed in the chamber located in the middle. The sound-absorbing filler is filled between the four sound-absorbing pipes, and the four sound-absorbing pipes and the sound-absorbing filler between them together form an internal sound-absorbing structure.

As a preferred technical solution of the present invention, both the first expansion joint and the second expansion joint are inserted into the interior of the main muffler.

As a preferred technical solution of the present invention, the main muffler, the intake elbow muffler and the exhaust elbow are all covered with aluminum silicate wool board, and the thickness of the aluminum silicate wool board is 30～ 50mm.

As a preferred technical solution of the present utility model, the first fire-resisting mesh and the second fire-resisting mesh are both metal meshes, and the thickness of the fire-resisting mesh is 10-20 cm.

As a preferred technical solution of the present invention, the oil discharge valve opens downward, the oil discharge valve and the main muffler are fixed by threaded connection, and the connection between the oil discharge valve and the main muffler is provided with a resistance High temperature metal sealing ring.

Compared with the prior art, the utility model has the following beneficial effects: the noise-absorbing structure is reasonable, the noise-absorbing effect is effective, and the noise-absorbing characteristics of the elbow joints are used to reduce noise, so that the noise of some medium and low frequency components can be eliminated; Air flow, which decelerates the air pressurized with uneven pulsating pressure, flattens the peak pressure, and makes the air flow more uniform and stable; the main muffler is an impedance combination structure, which mainly eliminates low and medium frequency noise, and the resistance mainly eliminates medium and high frequency. Noise; secondly, the fire resistance structure is appropriate and the fire resistance performance is good. There is a 30-50mm thick aluminum silicate cotton board on the outer surface of the system to keep the system at a high temperature of 500 ° C, which is conducive to the gasification of oil particles in the exhaust gas; in the main muffler Each of the first and third cavities is provided with a fire-resisting net. It can adsorb diesel particles and carbon particles in the exhaust gas, where they can be burned off under the action of high temperature.

Description of drawings

Fig. 1 is the front view of the flame-retardant exhaust muffler of the utility model.

FIG. 2 is a top view of the flame-retardant exhaust muffler of the utility model.

In the figure: 1. Main muffler; 2. First expansion joint; 3. Intake elbow muffler; 4. Second expansion joint; 5. Exhaust elbow; 6. Flame arrester; 7. First flame arrester ; 8. The second flame arrester; 9. Oil drain valve; 10. Muffler pipe.

Detailed ways

The present utility model will be described in further detail below with reference to the accompanying drawings and specific embodiments. The embodiments of the present invention are presented for purposes of illustration and description, and are not intended to be exhaustive or to limit the invention to the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiment was chosen and described in order to better explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for the design of various embodiments with various modifications as are suited to the particular use.

Please refer to Fig. 1-2, the utility model provides a technical solution:

A flame retardant exhaust muffler, comprising a main muffler 1, the intake end of the main muffler 1 is connected with the intake elbow muffler 3 through a first expansion joint 2, and the exhaust end of the main muffler 1 is connected with the second expansion joint 4. The exhaust elbow 5 is connected, the interior of the main muffler 1 is sequentially provided with a first flame arrester 7 and a second flame arrester 8 along the airflow direction, and an oil drain valve 9 is provided at the bottom end of the main muffler 1 .

Wherein, the two ends of the main muffler 1 are connected with the first expansion joint 2 and the second expansion joint 4 through flange sealing, and the first expansion joint 2 and the second expansion joint 4 are respectively connected with the elbow muffler 3 and the exhaust elbow The pipes 5 are sealed and connected by flanges; the end of the exhaust elbow 5 is provided with a flame arrester 6, and the main body of the flame arrester 6 is a mesh structure; The mouth and the main muffler 1 are all bent at 90°, and the turning point is an arc bend; the first flame arrester 7 and the second flame arrester 8 divide it into three chambers inside the main muffler 1 , four muffler pipes 10 are installed in the chamber in the middle, and sound-absorbing fillers are filled between the four muffler pipes 10, and the four muffler pipes 10 and the sound-absorbing fillers between them together form an internal muffler structure; The expansion joint 2 and the second expansion joint 4 are inserted into the main muffler 1; the main muffler 1, the intake elbow muffler 3 and the exhaust elbow 5 are all covered with aluminum silicate wool board The thickness of the plate is 30-50mm; the first flame arrester 7 and the second flame arrester 8 are both metal meshes, and the thickness of the flame arrester is 10-20cm, the oil drain valve 9 opens downward, and the oil drain valve 9 is connected to the main The mufflers 1 are fixed by screw connection, and a high temperature-resistant metal sealing ring is provided at the connection between the oil discharge valve 9 and the main muffler 1 .

Working principle: The intake elbow muffler is a resistant muffler structure composed of two 90° continuous elbow mufflers. In this anechoic cavity, both the airflow and the noise expand and then contract and discharge. For noise, the noise of some medium and low frequency components can be eliminated; for airflow, the airflow supercharged by uneven pulsating pressure is decelerated here, and the peak pressure is flattened, so that the airflow tends to be uniform and stable. In this way, when the airflow makes two 90° sharp turns here, the resistance loss can be reduced, and the intensity of the secondary noise of the airflow can also be weakened; secondly, the main muffler is an impedance combination structure, that is, when the sound and gas enter the first cavity of the main muffler, they expand again. After passing through the fire grid, it shrinks and flows into the second cavity. The second cavity consists of four muffler pipes and sound-absorbing materials to form a resistive muffler structure. When the sound and gas enter the second cavity, they expand again, and after passing through the fire-proof grid, they shrink and discharge. This structure is two resistive, one resistive constitutes a hybrid muffler. The resistance mainly eliminates low and medium frequency noise, and the resistance mainly eliminates medium and high frequency noise; at the same time, when the sound wave propagates forward along the pipeline and encounters the vertical pipe wall of the right angle elbow, a reflected wave will be generated, and part of the sound wave will be reflected back along the original path In this way, the intensity of the original noise is weakened, and the noise propagates in two mutually perpendicular planes. In such a bend, the frequency from 500 to 4000Hz is 1.5 to 4.5dB, and as the frequency increases, the noise reduction increases. In addition, the noise reflection loss of the exhaust port of the roof of the car is lost below 500Hz. The lower the frequency, the greater the loss, about 1-10dB; in addition, there is 30-50mm thick aluminum silicate cotton on the outer surface of the system. board and keep the system at a high temperature of 500 °C. It is beneficial to the gasification of oil particles in the exhaust gas. Combustible substances can be further burned (mainly in the form of sparks) in this system, which is much longer than the original exhaust duct; moreover, a flame arrester is set in the first and third chambers of the main muffler. It can adsorb diesel particles and carbon particles in the exhaust gas, which can be burned here under the action of high temperature. Finally, if the diesel oil may accumulate waste oil and water in the muffler under the condition of insufficient explosion, in order to prevent a large amount of accumulation in the muffler. Combustible substances, causing large burns or blasting. There is an oil discharge channel at the lowest part of the main muffler, and the accumulated oil is discharged from the oil discharge hole and valve. As long as the valve is frequently opened to discharge the oil, the shooting phenomenon can be prevented; the fire cap is installed at the end of the system, which can be foolproof. Missing Mars. Because the cap is in contact with the atmosphere, the temperature on the mesh cover is much lower than 500 ℃, and the temperature of Mars plummets and extinguishes as it passes through the mesh.

Obviously, the described embodiments are only some of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art and related fields without creative work shall fall within the protection scope of the present invention.

Claims (9)

1. The utility model provides a back-fire relief type exhaust muffler, includes main muffler (1), its characterized in that, the inlet end of main muffler (1) is connected with inlet bend silencer (3) through first expansion joint (2), the exhaust end of main muffler (1) passes through second expansion joint (4) and is connected with exhaust return bend (5), the inside of main muffler (1) has set gradually first fire blocking net (7) and second fire blocking net (8) along the air current direction, the bottom of main muffler (1) is provided with oil drain valve (9).

2. A fire retardant exhaust muffler according to claim 1, wherein the main muffler (1) is connected with the first expansion joint (2) and the second expansion joint (4) at both ends thereof by a flange seal, and the first expansion joint (2) and the second expansion joint (4) are connected with the elbow muffler (3) and the exhaust elbow (5) by a flange seal respectively.

3. A fire retardant exhaust muffler according to claim 1 wherein the end of the exhaust elbow (5) is provided with a fire retardant cap (6), the fire retardant cap (6) having a mesh structure as a main body.

4. A fire retardant exhaust muffler according to claim 1, wherein the openings of the inlet elbow muffler (3) and the exhaust elbow (5) are bent at 90 ° to the main muffler (1), and the bent portion is bent in a circular arc.

5. A fire retardant exhaust muffler according to claim 1, wherein the first fire retardant net (7) and the second fire retardant net (8) divide the main muffler (1) into three chambers, four muffling pipes (10) are installed in the middle chamber, sound absorbing fillers are filled between the four muffling pipes (10), and the four muffling pipes (10) and the sound absorbing fillers therebetween form an inner muffling structure.

6. A fire retardant exhaust muffler according to claim 1 wherein the first and second expansion joints (2, 4) are inserted into the main muffler (1).

7. The fire-retardant exhaust muffler is characterized in that the main muffler (1), the intake elbow muffler (3) and the exhaust elbow (5) are coated with aluminum silicate cotton plates, and the thickness of each aluminum silicate cotton plate is 30-50 mm.

8. A fire retardant exhaust muffler according to claim 1, wherein the first and second fire retardant nets (7, 8) are each a metal net and the thickness of the fire retardant net is 10-20 cm.

9. A fire retardant exhaust muffler according to claim 1, wherein the oil discharge valve (9) is opened downwards, the oil discharge valve (9) is fixed to the main muffler (1) by a screw connection, and a high temperature resistant metal sealing ring is arranged at the joint of the oil discharge valve (9) and the main muffler (1).

Images