CN114876882A

CN114876882A - Multi-stage compressed air silencer and application

Info

Publication number: CN114876882A
Application number: CN202110161131.8A
Authority: CN
Inventors: 陈建刚; 杨晓华; 杨满涛
Original assignee: Baoshan Iron and Steel Co Ltd
Current assignee: Baoshan Iron and Steel Co Ltd
Priority date: 2021-02-05
Filing date: 2021-02-05
Publication date: 2022-08-09

Abstract

The invention discloses a multi-stage compressed air silencer and application thereof, wherein the silencer comprises a shell and an air inlet pipeline, and at least three continuous cylindrical chambers are arranged in the shell along the axial direction; the adjacent chambers are separated by the chamber wall and are communicated through a connecting pipeline; adjacent connecting pipelines are arranged in a staggered manner along the radial direction; one end of the air inlet pipeline extends into the first cavity; along the airflow direction, each chamber is taken as a first-stage chamber, a second-stage chamber … … and a final-stage chamber, and an air outlet pipeline is arranged in the final-stage chamber; along the radial direction, the air inlet pipeline and a connecting pipeline connecting the primary chamber and the secondary chamber are arranged in a staggered manner; taking the inner diameter of an air inlet pipeline as D, the inner diameters of a first-stage cavity, a second-stage cavity … … and a last-stage cavity as 4-8D, and the depth of the cavity as 6-8D; the inner diameters of the connecting pipeline and the air inlet pipeline are equal; the distance between the end of the air inlet pipeline and the wall of the opposite first-stage chamber is 1-1.5D; the distance between the end heads on the two sides of each connecting pipeline and the wall of the corresponding cavity which is opposite to the end heads is 1-1.5D respectively.

Description

Multi-stage compressed air silencer and application

Technical Field

The invention belongs to the technical field of compressed air, and particularly relates to a multi-stage compressed air silencer with a water drainage function and application thereof.

Background

In the compressed air system application, air compressor machine equipment compresses gas in the operation, can make gas temperature rise in the gas compression process, and high temperature, high-pressure gas are through the cooling back, and moisture in the gas can be appeared, must get rid of in time from the gas with the moisture that separates out. Because the pressure of the compressed air rises, high-pressure air can be discharged along with the compressed air in the process of discharging moisture, high noise is generated, and the environment of people, production and life is influenced.

The principle of the silencer is that high-pressure gas is subjected to abrupt change of section, energy in the gas is released and changed into low-pressure gas, and therefore the function of eliminating noise is achieved. The common silencer can not instantly release the energy of high-pressure gas to be discharged from the air compressor, so that the discharged gas has higher kinetic energy, squeaking is generated when the gas passes through a silencer discharge port, and the environment is harmed by noise and the like.

Chinese patent CN207420682U discloses a silencer, which is characterized by comprising: a silencing shell and a tail gas treatment device; the silencing shell is sleeved outside the tail gas treatment device, so that a silencing cavity is formed between the silencing shell and the tail gas treatment device; a first partition plate is arranged between the silencing shell and the tail gas treatment device; the first partition plate divides the sound-deadening cavity into a first sub sound-deadening cavity and a second sub sound-deadening cavity along the airflow direction; and the outlet end of the tail gas treatment device is communicated with the second sub-silencing cavity. Due to its large volume, it is not suitable for use in compressed air systems.

Chinese patent CN202483682U discloses a labyrinth muffler, relates to muffler technical field, comprises A expansion chamber, B expansion chamber and C expansion chamber, its characterized in that: the expansion chamber B is connected with an air inlet pipe through an expansion pipe, the expansion chamber A is communicated with the expansion chamber B through a channel, the expansion chamber B is communicated with the expansion chamber C through a straight-through pipe, and the expansion chamber C is connected with an air outlet pipe. But does not have a drainage function.

Disclosure of Invention

The present invention is directed to overcome the above-mentioned shortcomings of the prior art, and to provide a multi-stage compressed air muffler capable of instantly releasing kinetic energy of gas and discharging water.

The technical problem to be solved can be implemented by the following technical scheme.

A multi-stage compressed air muffler comprising:

the shell is internally provided with at least three sequentially continuous cylindrical chambers along the axial direction; the adjacent chambers are separated by the chamber wall and are respectively communicated by a cylindrical connecting pipeline; adjacent connecting pipelines are arranged in a staggered manner along the radial direction; and

one end of the air inlet pipeline is led to the outside of the shell, the end of the air inlet pipeline forms an air inlet of the silencer, and the other end of the air inlet pipeline extends into the first chamber; along the direction of airflow, sequentially and continuously forming a first-stage chamber, a second-stage chamber … … and a last-stage chamber respectively, wherein an air outlet pipeline leading to the outside of the shell is arranged on the last-stage chamber, and an air outlet of the silencer is formed at the port of the air outlet pipeline; in the radial direction, the air inlet pipeline and a connecting pipeline connecting the primary cavity and the secondary cavity are arranged in a staggered mode;

the inner diameter of the air inlet pipeline is taken as D, the inner diameters of the primary cavity, the secondary cavity … … and the final cavity are 4-8D, and the depth of the cavity is 6-8D; the inner diameter of the connecting pipeline is equal to that of the air inlet pipeline; the distance between the end of the air inlet pipeline and the wall of the chamber of the opposite primary chamber is 1-1.5D; and the distance between the end heads on the two sides of each connecting pipeline and the chamber wall of the corresponding chamber which is opposite to the end heads is 1-1.5D respectively.

As a further improvement of the present solution, the connecting line is arranged vertically on a chamber wall separating adjacent chambers.

As one of the preferred embodiments of the present invention, the connecting line of the last stage chamber and the next-to-last stage chamber is perpendicular to the gas outlet line.

Preferably, the outlet duct is located in the wall of the chamber distal to the respective connecting duct in the final chamber.

As a further improvement of the technical scheme, the inner diameter of the gas outlet pipeline is 1.5D.

As a further improvement of the technical scheme, three to four sequentially continuous cylindrical chambers are arranged in the shell.

As another preferred embodiment of the present invention, three consecutive cylindrical chambers are provided in the housing.

As another preferred embodiment of the invention, the adjacent connecting pipelines are arranged along the radial direction in a 180-degree staggered mode.

Also preferably, the air inlet pipeline and the connecting pipeline connecting the primary chamber and the secondary chamber are arranged in a 180-degree staggered mode in the radial direction.

As a further improvement of the technical scheme, the distance between the wall of the gas outlet pipeline and the wall of the cavity opposite to the port of the connecting pipeline in the last-stage cavity is 1-1.5D.

Another technical problem to be solved by the present invention is to provide an application of the multi-stage compressed air muffler to the drainage pipeline of the first and second coolers of the centrifugal air compressor.

The present invention provides a multi-stage type compressed air muffler for use in a compressed air delivery pipeline drain pipeline, the muffler being installed at a lowest drain pipeline.

Compared with the prior art, the silencer structure adopting the technical scheme and the application thereof have the following advantages and beneficial effects:

compared with the prior art, the silencer has the advantages of simple structure, small volume, convenient installation, functions of exhausting, draining and the like, and can reduce the noise to 40 decibels during exhausting; the noise problem of the factory office area is solved.

Drawings

FIG. 1 is a schematic structural view of a multi-stage compressed air muffler of the present invention;

in the figure: inlet section 100,

housing

10, 20, 30,

chamber

40, 50, connecting line 60,

inlet line

110, 120, separating wall 130, bottom wall 140, top wall 150,

outlet line

41, 51, 61,

outlet

42, 52, inlet 62

Detailed Description

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.

The invention provides a multistage compressed air silencer and application thereof, and the specific technical scheme is as follows:

the multi-stage compressed air silencer with water draining function is composed of 3-4 stages of cylinders (cavities) and is provided with air inlet, cylinders (cavities) and air and water outlets. The cavities at all levels are connected through pipelines with the same diameter as the air inlet, so that the compressed air can be ensured to generate gas expansion and kinetic energy loss after entering the cavities at all levels, and finally, the moisture in the compressed air is discharged together with the gas.

The air inlet pipeline is determined by the diameter of the pipeline which needs to be drained (exhausted) by the air compressor equipment or the compressed air pipeline.

The cylinder (cavity) of the silencer is determined by the diameter of the air inlet pipeline, and the requirement of the specific numerical value of the sudden change section of the gas is considered; designing a cylinder with 4 to 8 times of the diameter of the drainage pipeline, wherein the volume of the cylinder can reach 16 to 64 times of the volume of the drainage pipeline; the drainage pipeline is placed in the cylinder, and after the compressed gas enters the first-stage gas, the volume of the gas is expanded due to the sudden change of the section, the flow rate is reduced, and a large amount of kinetic energy is lost. The gas enters the second cavity and the third cavity in sequence, and the kinetic energy of the gas is faded continuously until the gas is discharged.

The silencer body is formed by combining identical cylinders in multiple stages (generally 3 to 4 cylinders) to form a whole. The kinetic energy of the compressed air is released after the compressed air is repeatedly circulated and diameter-changed in the original column.

Referring to fig. 1, a typical structure thereof is as follows:

the housing 100 of the silencer is a cylindrical cavity, which includes three

cylindrical chambers

30, 20 and 10 from top to bottom. The air inlet pipeline 60 is vertically arranged at the top wall 140, and is in a circular tube shape (cylindrical shape), and the inner diameter is D; the air inlet section 62 is exposed outside the shell, the lower part of the air inlet section extends into the cavity 30, and the distance between the outlet 61 of the lower part of the air inlet section and the partition wall 120 is 1-1.5D.

The connecting line 50 is vertically disposed on the partition wall 120 and communicates the

chambers

30 and 20 via the connecting line 50 (the partition wall 120 is actually a chamber wall separating two adjacent chambers); the distance from the inlet 52 at the upper end of the connecting pipeline 50 to the top wall 140 is 1-1.5D, and the distance from the outlet 51 at the lower end to the partition wall 110 is 1-1.5D.

The connecting line 40 is vertically disposed on the partition wall 110 and communicates the

chambers

10 and 20 via the connecting line 40 (the partition wall 110 is actually a chamber wall separating two adjacent chambers); the distance from the inlet 42 at the upper end of the connecting pipeline 40 to the partition wall 120 is 1-1.5D, and the distance from the outlet 41 at the lower end to the bottom wall 130 is 1-1.5D.

The connecting

lines

40 and 50 are arranged offset, for example, by 180 ° in the radial (circumferential) direction. Similar offset arrangements are used for connecting line 50 and air inlet line 60.

The air outlet pipeline 150 is vertically arranged on the side wall of the chamber 10, and the height from the lowest position of the pipeline to the bottom wall 130 in the figure is 1-1.5D; the inner diameter of the outlet line 150 is preferably 1.5D.

In use, fluid enters along the inlet section 60, enters the chamber 30 through the outlet 61, then enters the chamber 20 through the inlet 52 to the outlet 51; and then through the inlet 42 to the outlet 41 into the chamber 10 and out the outlet line 150.

Wherein:

when the diameter of the compressed air exhaust (water) pipeline is determined, a cylinder with 4 to 8 times of direct water discharge pipelines (namely, the inner diameter of each chamber in the figure is 4-8D, preferably 6-8D, and the height of each chamber in the figure is 6-8D) is designed in consideration of the energy loss characteristic after the gas has sudden change of section), the exhaust (water) pipeline is placed in the cylinder, and the same cylinders are combined in multiple stages (generally 3 to 4 stages) to form a whole, so that the multi-stage compressed air silencer is formed.

When the compressed air (containing water) to be discharged enters the silencer, the gas is rapidly expanded in the first-stage cylinder (such as the chamber 30 in the figure), the flow rate of the gas is reduced, and a large amount of kinetic energy of the gas is lost; then enters the cavity of the next stage (such as the cavity 20 in the figure) for kinetic energy release; after the compressed air is repeatedly circulated in the cylinder body and the gas flow channel is changed in diameter, the kinetic energy of the compressed air is completely released, the flow rate of the discharged compressed air is greatly reduced, and the noise of gas emission is effectively reduced.

Further, by calculating the air flow rate in the air flow in the multistage compressed-air muffler, the following conclusions can be made:

when compressed air needing to be discharged (containing water) enters the silencer at the speed of V m/s, the flow speed of the air is instantly reduced and the kinetic energy of the air is quickly attenuated due to the change of the section in the primary cavity; the flow rate of the gas is related to the cross-sectional change. The figure shows that the reduction speed is reduced according to the diameter of 4-8 times, and the gas flow speed is reduced by 16-64 times through calculation. By analogy, the flow rate of the gas can be reduced by 48-192 times through three-stage pressure reduction and speed reduction. The actual volume expansion at each stage is about 14 times, subtracting the volume of the D channel in the cavity.

Taking the first stage inlet compressed air flow rate of V m/s as an example, the flow rate of the gas at the muffler outlet will reach 0.0004V m/s, assuming a compressed air flow rate of 10m/s, and an outlet air flow rate of 0.04 m/s.

Meanwhile, the noise of the gas at the outlet can be lower than 60 decibels through measurement.

The invention provides a multi-stage compressed air silencer with a drainage function, and aims to effectively convert high-pressure compressed air into low-pressure air through the change of multi-stage gas volume and section and reduce noise. The main function is to make the high-pressure compressed air break suddenly in the first-stage cavity to consume the kinetic energy; and the compressed air enters the second-stage cavity and the third-stage cavity in sequence to generate section mutation, and finally the energy of the (water-containing) compressed air to be discharged is exhausted together with the moisture, so that the noise of the compressed air at the discharge port is reduced.

The invention is further illustrated by the following examples of specific applications.

Example 1:

in an air compression station room of a certain factory, on the drainage pipeline of the first-stage cooler and the second-stage cooler of the centrifugal air compressor, the silencer is installed at the tail end of the pipeline according to the drainage mode and the pipeline diameter of an air compressor equipment unit, and the direction of an exhaust outlet is set according to the field condition. The noise in the exhaust of the area is reduced to 39 db.

Example 2:

after the silencer is additionally arranged on the drainage pipeline at the lowest position of the compressed air conveying pipeline in a certain factory, the howling sound in the factory is controlled, and the harm of noise to operators is reduced.

The foregoing description of the embodiments is provided to enable any person skilled in the art to make or use the present invention. It will be apparent to those skilled in the art that various modifications can be easily made to these embodiments and the present invention can be applied to other embodiments without inventive faculty. Therefore, the present invention is not limited to the embodiments described herein, and those skilled in the art should make improvements and modifications within the scope of the present invention according to the contents of the present invention.

Claims

1. A multi-stage compressed air muffler, comprising:

2. The multi-stage compressed air muffler of claim 1, wherein the connecting pipe is arranged vertically on a chamber wall separating adjacent chambers.

3. The multi-stage compressed air muffler of claim 1, wherein the connecting lines of the last stage chamber and the next-to-last stage chamber run perpendicular to the outlet line.

4. The multi-stage compressed air muffler of claim 3, wherein the outlet duct is positioned on a wall of the chamber distal from the respective connecting duct in the last stage chamber.

5. The multi-stage compressed air muffler of claim 1, wherein the inner diameter of the outlet pipe is 1.5D.

6. The multi-stage compressed air muffler of claim 1, wherein three to four consecutive cylindrical chambers are provided in the housing.

7. The multi-stage compressed air muffler of claim 1, wherein adjacent connecting pipes are radially offset by 180 degrees; along the radial direction, the air inlet pipeline and a connecting pipeline connecting the primary cavity and the secondary cavity are arranged in a 180-degree staggered mode.

8. The multi-stage compressed air muffler of claim 1, wherein the distance between the wall of the outlet pipe and the wall of the last stage chamber where the pipe port faces is 1-1.5D.

9. Use of the multi-stage compressed air silencer of any of claims 1-8 in the drainline of the primary and secondary coolers of a centrifugal air compressor.

10. Use of a multi-stage compressed air silencer according to any of claims 1-8 in a compressed air supply pipeline drain, the silencer being installed in the lowest drain.