Multi-layer silencer

Abstract

The multilayer silencer comprises an air inlet end cover and a first sealing cover, the air inlet end cover is provided with an air inlet, an air outlet pipe is arranged between the air inlet end cover and the first sealing cover, air outlet holes are formed in the pipe wall of the air outlet pipe, the inner wall of the air outlet pipe is connected with a first filter element in a sleeved mode, a second filter element assembly is arranged in the first filter element, and the second filter element assembly is connected with the first filter element in a sleeved mode. A buffer channel is formed between the first filter element and the second filter element assembly, the first end of the second filter element assembly is in butt joint with the air inlet, and the second end of the second filter element assembly is closed. The two layers of filter elements are arranged to reduce noise, the noise reduction capacity can be remarkably improved, the influence on the displacement is extremely small, and the noise reduction effect of a silencer with the larger caliber is improved more obviously.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of multilayer mufflers. BACKGROUND

[0002] According to industry, 1) bottle blowing machine industry: the muffler used now is mainly produced by American or Japanese company, uses pressure about 3MPa, and the common caliber has 4 minutes, 6 minutes, 1 inch, 1 inch 2.For Japanese company 1 inch product, actual effect is about 103~108dB (A) by environmental temperature, humidity and air pressure, and the effect of the muffler produced by the United States is same, and the most ideal test result is also 103dB (A).

[0003] 2) air separation machine industry: the muffler used now is mainly produced by American, and there are more domestic manufacturers to produce similar effect products.The pressure used is about 0.7MPa, and the common caliber has 1 inch 5, 2 inches, 2 inches 5.The effect of 2-inch muffler is about 107dB (A).

[0004] According to the provisions of GBZ2.2-2007, for the working system of 8-hour workday and 40-hour workweek, the noise exposure limit value of the workplace is 85 decibels (A) 8-hour equivalent continuous sound level, or 90 decibels (A) 4-hour equivalent continuous sound level. This means that if the noise level of the working environment reaches or exceeds 85 decibels, the employer must take necessary measures to reduce the noise level to protect the hearing health of employees. In these two industries, due to high air pressure or large caliber, the noise reaches more than 100dB (A), which is much higher than 90dB (A), so it is urgent to develop a muffler with good muffling effect. SUMMARY

[0005] In view of the deficiencies of the prior art, the utility model provides a kind of multilayer mufflers.

[0006] To achieve the above purpose, the technical scheme adopted by the utility model is: a kind of multilayer mufflers, including air inlet end cover, first cover, the air inlet end cover is equipped with air inlet, air outlet pipe is equipped between the air inlet end cover, first cover, the pipe wall of the air outlet pipe is equipped with air outlet hole, the first filter element is sleeved in the inner wall of the air outlet pipe, the second filter element assembly is equipped in the first filter element, the buffer passage is formed between the first filter element and the second filter element assembly, the first end of the second filter element assembly and air inlet are connected, and the second end of the second filter element assembly is closed.

[0007] The second filter element assembly includes a second filter element, a second cover disposed at the second end of the second filter element assembly, and a first inner tube sleeved on the outer wall of the second filter element.

[0008] The second filter core inner wall is sleeved with a second inner tube, and the second inner tube wall is provided with air outlet holes.

[0009] The connecting rod comprises a head and a screw rod, the first cover and the second cover are respectively provided with a first through hole and a second through hole, a nut is connected to the screw rod, the nut is located between the first cover and the second cover, a connecting part is arranged in the air inlet, the connecting part is provided with a threaded hole, the screw rod is connected with the threaded hole after passing through the first through hole and the second through hole, the second cover and the nut abut, and the head of the connecting rod and the first cover abut.

[0010] The air inlet end cover is provided with a hexagonal boss for conveniently tightening the air inlet end cover.

[0011] The air inlet end cover is provided with a positioning hole for positioning the second filter core assembly.

[0012] The utility model discloses the beneficial effect: the utility model discloses two layers of filter core to reduce noise, can improve the noise reduction ability obviously, and the influence to displacement is extremely little, and the noise reduction effect is more obvious to the muffler of bigger caliber. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is the structural diagram of the utility model;

[0014] Figure 2 It is the sectional view of the utility model;

[0015] Figure 3 It is the structural diagram of the front view air inlet of the utility model;

[0016] Figure 4 It is the noise-air pressure diagram of experiment one;

[0017] Figure 5 It is the back pressure-air pressure diagram of experiment one;

[0018] Figure 6 It is the noise-air pressure diagram of experiment two;

[0019] Figure 7 It is the back pressure-air pressure diagram of experiment two;

[0020] Figure 8 It is the noise-air pressure diagram of experiment three;

[0021] Figure 9 It is the back pressure-air pressure diagram of experiment three. DETAILED DESCRIPTION

[0022] As Figures 1-3As shown, a multi-layer silencer comprises an air inlet end cover 1, a first cover 2, the air inlet end cover 1 is provided with an air inlet 11, the air inlet end cover 1 and the first cover 2 are provided with an air outlet pipe 3, the air outlet pipe 3 is provided with an air outlet hole 4 on the pipe wall, the air outlet pipe 3 is sleeved with a first filter element 5 on the inner wall, the first filter element 5 is provided with a second filter element assembly 6 inside, a buffer channel 12 is formed between the first filter element 5 and the second filter element assembly 6, the first end of the second filter element assembly 6 is connected with the air inlet 11, and the second end of the second filter element assembly 6 is closed.

[0023] Working principle: compressed air enters from the air inlet 11 of the first cover 2, and after the flow rate is reduced through the second filter element assembly 6, the air is uniformly diffused in the buffer channel 12 between the first filter element 5 and the second filter element assembly 6, and finally passes through the first filter element 5 and the air outlet pipe 3, and then is discharged. The second filter element assembly 6 is used to increase the resistance and consume the energy of the airflow, directly showing that the air pressure difference between the inside and outside of the second filter element assembly 6 is large, forming the effect of air pressure gradient drop, and the silencing effect is improved. The filter element material is selected according to the situation, such as sound-absorbing paper, sound-absorbing cotton, PP, ultrahigh molecular polyethylene or other existing sound-absorbing filter element materials.

[0024] The second filter element assembly 6 comprises a second filter element 60, a second cover 61 arranged at the second end of the second filter element assembly 6, and a first inner pipe 62 sleeved on the outer wall of the second filter element 60, and the first inner pipe 62 is provided with an air outlet hole 4 on the pipe wall.

[0025] The inner wall of the second filter element 60 is sleeved with a second inner pipe 63, and the second inner pipe 63 is provided with an air outlet hole 4 on the pipe wall. The first inner pipe 62 and the second inner pipe 63 can protect the second filter element 60 and enhance the rigidity of the entire silencer, and the air outlets on the first inner pipe 62 and the second inner pipe 63 can also improve the silencing effect.

[0026] Further comprising a connecting rod 7, the connecting rod 7 comprises a head 71 and a screw rod 72, the first cover 2 and the second cover 61 are respectively provided with a first through hole 21 and a second through hole 64, the screw rod 72 is connected with a nut 73, the nut 73 is located between the first cover 2 and the second cover 61, the air inlet 11 is provided with a connecting portion 13, the connecting portion 13 is provided with a threaded hole 14, the screw rod 72 passes through the first through hole 21 and the second through hole 64 and is connected with the threaded hole 14, and the second cover 61 and the nut 73 abut, and the head 71 of the connecting rod 7 and the first cover 2 abut.

[0027] The air inlet end cover 1 is provided with a hexagonal boss 15 for conveniently tightening the air inlet end cover 1.

[0028] The air inlet end cover 1 is provided with a positioning hole 16 for positioning the second filter element assembly 6.

[0029] The beneficial effects of the present application will be illustrated below in combination with experiments.

[0030] Experiment one: 75L, 3MPa compressed air exhaust test. The multi-layer muffler designed in this patent can improve the noise reduction effect by about 5dB(A) compared with the existing product when the exhaust is 3.0MPa, 1-inch caliber pipeline. The exhaust volume has no obvious difference according to the back pressure comparison. The test results are shown in Figures 4-5 .

[0031] Experiment two: Compared with the one-layer filter element muffler, the multi-layer muffler designed in this patent can improve the noise reduction effect by about 15dB(A) when the exhaust is 0.6MPa, 2-inch caliber pipeline. The exhaust volume has no obvious difference according to the back pressure comparison. The test results are shown in Figures 6-7 .

[0032] Experiment three: Compared with the one-layer filter element muffler, the multi-layer muffler designed in this patent can improve the noise reduction effect by about 5dB(A) when the exhaust is 0.6MPa, 1-inch 2-caliber pipeline. The exhaust volume has no obvious difference according to the back pressure comparison. The test results are shown in Figures 8-9 .

[0033] From the above experimental results, it can be seen that the utility model can significantly improve the noise reduction capability, and the influence on the displacement is very small. The larger the caliber of the muffler, the more obvious the improvement of the noise reduction effect.

[0034] The above shows and describes the basic principle, main features and advantages of the utility model. It should be understood by those skilled in the art that the utility model is not limited by the above examples. The above examples and descriptions in the specification are only to illustrate the principle of the utility model. Simple changes and replacements of ordinary technical personnel in this field without departing from the spirit and scope of the utility model are within the protection scope of the utility model.

Claims

1. A multilayer muffler, characterized by, The air inlet end cover is provided with an air inlet, and a gas outlet pipe is arranged between the air inlet end cover and the first cover.

2. A multi-layered sound damper as claimed in claim 1, characterized in that The second filter element assembly comprises a second filter element, a second cover arranged at the second end of the second filter element assembly, and a first inner pipe sleeved on the outer wall of the second filter element.

3. A multi-layered sound damper as claimed in claim 2, characterized in that The second filter element is provided with a second inner pipe sleeved on the inner wall thereof, and the pipe wall of the second inner pipe is provided with an air outlet hole.

4. A multi-layered sound damper as claimed in claim 2 or 3, characterized in that The connecting rod comprises a head and a screw rod, the first cover and the second cover are respectively provided with a first through hole and a second through hole, a nut is connected to the screw rod, the nut is located between the first cover and the second cover, a connecting portion is arranged in the air inlet, the connecting portion is provided with a threaded hole, the screw rod is connected to the threaded hole after passing through the first through hole and the second through hole, the second cover and the nut abut, and the head of the connecting rod and the first cover abut.

5. A multi-layered sound damper as defined in claim 4, wherein, The air inlet end cover is provided with a hexagonal boss for conveniently tightening the air inlet end cover.

6. A multi-layered sound damper as defined in claim 4, wherein, The air inlet end cover is provided with a positioning hole for positioning the second filter element assembly.

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