Silencer for air compressor

Abstract

The utility model provides a silencer for an air compressor, and belongs to the technical field of air compressors. The problem that an existing silencer is poor in noise reduction effect is solved. The silencer for the air compressor comprises an outer shell, a filter part is arranged in the outer shell and divides the interior of the outer shell into an air inlet cavity and an air outlet cavity which are independent from each other, and a silencing cavity is formed in the outer shell and communicated with the air inlet cavity or the air outlet cavity. According to the structure, due to the arrangement of the silencing cavity, noise in the air outlet cavity or the air inlet cavity is shunted and enters the silencing cavity, noise sound waves are weakened and absorbed in the silencing cavity, then the noise in the process is greatly reduced, and the noise of the whole air compressor in the working process is remarkably reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of muffler, especially a muffler for air compressor. BACKGROUND

[0002] Air compressor is a kind of equipment to compress gas, and is widely used in people's production and life, since air compressor will suck a large amount of air in the working process, unstable airflow will be generated around the air inlet pipe, resulting in a large amount of noise, in order to reduce the noise, the muffler is applied to the air compressor, the air outside enters the air compressor through the muffler, thereby significantly reducing the intake noise.

[0003] At present, China patent network discloses a kind of air compressor muffler

grant announcement number: CN206668506U

[0004] The above-mentioned muffler has the following defects: the air outlet pipe of the muffler is connected with the air inlet chamber of the cylinder head of the air compressor, and the noise generated by the high-frequency vibration of the air inlet valve during the working process of the air compressor will flow back to the muffler through the air outlet pipe, so that the muffler has a certain noise reduction effect, but the noise reduction effect of the muffler with this structure is not very ideal. UTILITY MODEL CONTENTS

[0005] The utility model aims at the above-mentioned problems existing in the prior art, and provides a muffler for air compressor, and the technical problem to be solved by the utility model is how to further improve the noise reduction effect of the muffler.

[0006] The purpose of the utility model can be realized by the following technical schemes:

[0007] A muffler for air compressor, comprising an outer shell, a filter is arranged in the outer shell, the filter separates the inside of the outer shell into an air inlet cavity and an air outlet cavity which are independent of each other, characterized in that an acoustic cavity is arranged in the outer shell, and the acoustic cavity is connected with the air inlet cavity or the air outlet cavity.

[0008] The outside air first enters into the air inlet cavity, the air in the air inlet cavity enters into the air outlet cavity after being filtered by the filter, the filter filters and removes dust from the air, and finally the air enters into the air inlet chamber of the air compressor cylinder head through the air outlet cavity. The structure separately sets an air silencer cavity in the outer shell, during the air inlet process, part of the air entering into the air inlet cavity or the air outlet cavity is branched into the air silencer cavity, thereby weakening the air inlet noise and reducing the air inlet noise; the noise generated by the high-frequency vibration of the air inlet valve plate of the air compressor cylinder head first flows back into the air outlet cavity, the noise in the air outlet cavity enters into the air inlet cavity through the filter, the setting of the air silencer cavity makes the noise in the air outlet cavity or the air inlet cavity be branched into the air silencer cavity, the noise waves are weakened and absorbed in the air silencer cavity, thereby greatly reducing the noise in the process, and thereby significantly reducing the noise of the air compressor during the working process.

[0009] In the above-mentioned air silencer for air compressor, the inner shell is arranged in the outer shell, the inner shell has an opening in communication with the filter, the filter and the inner shell form the air inlet cavity, the inner shell and the outer shell form the air silencer cavity, and the inner shell is provided with a plurality of sound holes in communication with the air silencer cavity.

[0010] In the above-mentioned air silencer for air compressor, the inner shell is arranged in the outer shell, the inner shell has an opening in communication with the filter, the filter and the inner shell form the air inlet cavity, the inner shell and the outer shell form the air silencer cavity, and the inner shell is provided with a plurality of sound holes in communication with the air silencer cavity.

[0011] In the above-mentioned air silencer for air compressor, the outer shell and the inner shell are integrally formed; or the outer shell and the inner shell are in a split structure, and the outer shell and the inner shell are welded.

[0012] In the above-mentioned air silencer for air compressor, a plurality of sound wave reflection protrusions are arranged on the inner wall of the air silencer cavity. The noise waves entering into the air silencer cavity are gradually weakened and absorbed by the plurality of sound wave reflection protrusions, thereby further improving the noise reduction effect of the air silencer cavity.

[0013] In the above-mentioned silencer for air compressor, the sound absorbing cavity is provided with an inner side wall one opposite to the sound absorbing hole, the sound absorbing cavity is provided with an inner side wall two parallel to the inner side wall one, and the inner side wall one and the inner side wall two are both provided with the sound wave reflection protrusion one. The backflow noise enters the sound absorbing cavity through the sound absorbing hole one, and the backflow noise first impacts on the sound wave reflection protrusion one of the inner side wall one and is reflected to the sound wave reflection protrusion one of the inner side wall two. The noise sound wave is reflected in turn, and the noise is gradually weakened and disappears, so that the noise reduction effect is further improved.

[0014] In the above-mentioned silencer for air compressor, the air inlet cavity is provided with an air inlet pipe, one end of the air inlet pipe is provided with an air inlet for communicating with the outside, and the other end of the air inlet pipe is provided with an air outlet for communicating with the air inlet cavity. The air in the outside enters the air inlet pipe through the air inlet, and then enters the air inlet cavity through the air outlet.

[0015] In the above-mentioned silencer for air compressor, the air outlet cavity is provided with an exhaust pipe, both ends of the exhaust pipe extend out of the shell, both ends of the exhaust pipe are provided with exhaust outlets, and a plurality of sound absorbing holes two are formed on the part of the exhaust pipe in the air outlet cavity. The exhaust pipe is connected with the air inlet chamber of the cylinder head of the air compressor through the pipeline outside the exhaust pipe. When the air inlet, the gas enters the exhaust pipe through the plurality of sound absorbing holes two, and the plurality of sound absorbing holes two have a certain noise reduction effect on the air inlet process. When the backflow noise flows through the plurality of sound absorbing holes two and enters the air outlet cavity, the plurality of sound absorbing holes two also have a certain noise reduction effect on the backflow noise.

[0016] In the above-mentioned silencer for air compressor, the inner wall of the air outlet cavity is distributed with a plurality of sound wave reflection protrusions two. The plurality of sound wave reflection protrusions two have a certain noise reduction effect on the air inlet noise and also have a certain noise reduction effect on the backflow noise.

[0017] Compared with the prior art, the silencer for air compressor has the following advantages: the structure separately provides a sound absorbing cavity in the shell, and part of the gas is shunted into the sound absorbing cavity after entering the air inlet cavity or the air outlet cavity in the air inlet process, so that the air inlet noise is weakened and reduced. The noise generated by the high-frequency vibration of the air inlet valve piece of the cylinder head of the air compressor is first backflowed into the air outlet cavity, and the noise in the air outlet cavity enters the air inlet cavity through the filter. The arrangement of the sound absorbing cavity makes the noise in the air outlet cavity or the air inlet cavity be shunted into the sound absorbing cavity, the noise sound wave is weakened and absorbed in the sound absorbing cavity, so that the noise in the process is greatly reduced, and the noise of the air compressor during the working process is significantly reduced. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a three-dimensional structure schematic diagram of the embodiment 1 of the utility model.

[0019] Figure 2 is one of the cross-sectional structure schematic view of the embodiment 1 of the utility model.

[0020] Figure 3 is the second cross-sectional structure schematic view of the embodiment 1 of the utility model.

[0021] Figure 4 is the three-dimensional structure schematic view of the inner shell of the embodiment 1 of the utility model.

[0022] Figure 5 is the partial three-dimensional structure schematic view of the outer shell of the embodiment 1 of the utility model.

[0023] Figure 6 is the cross-sectional structure schematic view of the embodiment 2 of the utility model.

[0024] In the figure, 1, outer shell; 2, filter piece; 3, air inlet cavity; 4, air outlet cavity; 40, sound wave reflection protrusion two; 5, sound attenuation cavity; 50, sound wave reflection protrusion one; 51, inner side wall one; 52, inner side wall two; 6, inner shell; 60, opening; 61, sound attenuation hole one; 7, air inlet pipe; 70, air inlet; 71, air outlet; 8, air outlet pipe; 80, air outlet; 81, sound attenuation hole two. DETAILED DESCRIPTION

[0025] The following is the specific embodiment of the utility model and is further described the technical scheme of the utility model in combination with the drawings, but the utility model is not limited to these embodiments.

[0026] As Figures 1-3As shown, the air compressor muffler comprises an outer shell 1, a filter 2 is arranged in the outer shell 1, the filter 2 divides the outer shell 1 into an independent air inlet cavity 3 and an air outlet cavity 4, an air inlet pipe 7 is arranged in the air inlet cavity 3, one end of the air inlet pipe 7 is provided with an air inlet port 70 for communicating with the outside, the other end of the air inlet pipe 7 is provided with an air outlet port 71 for communicating with the air inlet cavity 3, an exhaust pipe 8 is arranged in the air outlet cavity 4, both ends of the exhaust pipe 8 extend out of the outer shell 1, both ends of the exhaust pipe 8 are provided with exhaust ports 80, and a plurality of sound attenuation holes two 81 are arranged on the part of the exhaust pipe 8 located in the air outlet cavity 4. An air attenuation cavity 5 is arranged in the outer shell 1, and the air attenuation cavity 5 is in communication with the air inlet cavity 3. In this embodiment, an inner shell 6 is arranged in the outer shell 1, the inner shell 6 and the outer shell 1 are in a split structure, the inner shell 6 and the outer shell 1 are both plastic parts and are welded, the inner shell 6 is provided with an opening 60 in communication with the filter 2, part of the filter 2 is located in the opening 60 and the other part is located in the air outlet cavity 4, the air inlet cavity 3 is formed between the filter 2 and the inner shell 6, the air attenuation cavity 5 is formed between the inner shell 6 and the outer shell 1, the inner shell 6 is provided with a plurality of sound attenuation holes one 61 in communication with the air attenuation cavity 5. The outer end of the exhaust pipe 8 is connected with a pipeline and then communicates with the air inlet chamber of the air compressor cylinder head, the air in the outside enters the air inlet pipe 7 through the air inlet port 70, enters the air inlet cavity 3 from the air outlet port 71 of the air inlet pipe 7, the air inlet noise in the air inlet cavity 3 is divided into the air attenuation cavity 5 through the sound attenuation holes one 61, the air attenuation cavity 5 reduces the air inlet noise, thereby reducing the air inlet noise, the gas in the air inlet cavity 3 enters the air outlet cavity 4 after being filtered by the filter 2, the filter 2 filters the air inlet, the gas in the air outlet cavity 4 enters the exhaust pipe 8 through the sound attenuation holes two 81, and finally enters the air inlet chamber of the air compressor cylinder head through the exhaust ports 80 of the exhaust pipe 8. The structure adopts another separate air attenuation cavity 5 in the outer shell 1, in the air inlet process, part of the gas in the air inlet cavity 3 is divided into the air attenuation cavity 5, thereby weakening the air inlet noise and reducing the air inlet noise; the noise generated by the high-frequency vibration of the air inlet valve piece of the air compressor cylinder head first flows back to the air outlet cavity 4, the noise in the air outlet cavity 4 passes through the filter 2 and enters the air inlet cavity 3, the filter 2 also has a certain noise reduction effect on the backflow noise, the arrangement of the air attenuation cavity 5 makes the noise in the air inlet cavity 3 be divided into the air attenuation cavity 5, the noise wave is weakened and absorbed in the air attenuation cavity 5, thereby greatly reducing the noise in the process, thereby significantly reducing the noise of the air compressor during the working process, compared with the existing muffler, the muffler of the structure can reduce the overall working noise of the air compressor by more than 10%.

[0027] As Figure 2 , Figure 4 and Figure 5As shown, the inner wall of the sound attenuation cavity 5 is provided with a plurality of sound wave reflection protrusions 50. In this embodiment, the sound attenuation cavity 5 has an inner side wall 51 opposite to the sound attenuation hole 61, and has an inner side wall 52 parallel to the inner side wall 51. The sound wave reflection protrusions 50 are arranged on the inner side wall 51 and the inner side wall 52. The backflow noise enters the sound attenuation cavity 5 through the sound attenuation hole 61, and first hits the sound wave reflection protrusions 50 on the inner side wall 51, and is reflected to the sound wave reflection protrusions 50 on the inner side wall 52. The noise sound waves are repeatedly reflected in sequence, gradually weaken and disappear, and the noise reduction effect is further improved.

[0028] As shown in Figure 2 , the inner wall of the air outlet cavity 4 is provided with a plurality of sound wave reflection protrusions 40. The plurality of sound wave reflection protrusions 40 have a certain noise reduction effect on the intake noise and a certain noise reduction effect on the backflow noise.

[0029] Embodiment 2

[0030] This embodiment is basically the same as the content of the above-mentioned embodiment 1, and the difference is that, as shown in Figure 6 , the inner housing 6 is arranged in the outer housing 1 in this embodiment, the inner housing 6 has an opening 60 in communication with the filter 2, the filter 2 and the inner housing 6 form the air outlet cavity 4, the inner housing 6 and the outer housing 1 form the sound attenuation cavity 5, and the inner housing 6 is provided with a sound attenuation hole 61 in communication with the sound attenuation cavity 5.

[0031] Embodiment 3

[0032] This embodiment is basically the same as the content of the above-mentioned embodiment 1, and the difference is that the outer housing 1 and the inner housing 6 are integrally formed in this embodiment.

[0033] The specific embodiments described herein are merely illustrative of the spirit of the present application. Those skilled in the art of the present application can make various modifications or supplements to the described specific embodiments or replace them with similar ways, without deviating from the spirit of the present application or exceeding the scope defined by the appended claims.

Claims

1. A silencer for an air compressor, comprising an outer casing (1), a filter (2) being arranged in the outer casing (1), the filter (2) separating the outer casing (1) into an intake cavity (3) and an exhaust cavity (4) which are independent of each other, characterized in that, The outer shell (1) is provided with a sound absorbing cavity (5) which is communicated with the air inlet cavity (3) or the air outlet cavity (4).

2. The silencer for an air compressor according to claim 1, wherein The outer shell (1) is provided with an inner shell (6) which has an opening (60) communicated with the filter (2), the filter (2) and the inner shell (6) form the air inlet cavity (3), the inner shell (6) and the outer shell (1) form the sound absorbing cavity (5), the inner shell (6) is provided with a sound absorbing hole (61) communicated with the sound absorbing cavity (5).

3. The silencer for an air compressor according to claim 1, wherein The outer shell (1) is provided with an inner shell (6) which has an opening (60) communicated with the filter (2), the filter (2) and the inner shell (6) form the air outlet cavity (4), the inner shell (6) and the outer shell (1) form the sound absorbing cavity (5), the inner shell (6) is provided with a sound absorbing hole (61) communicated with the sound absorbing cavity (5).

4. The silencer for an air compressor according to claim 2, wherein The outer shell (1) and the inner shell (6) are integrally formed; or the outer shell (1) and the inner shell (6) are in a split structure, and the outer shell (1) and the inner shell (6) are welded.

5. The silencer for an air compressor according to claim 1 or 2 or 3, characterized by The inner wall of the sound absorbing cavity (5) is provided with a plurality of sound wave reflection protrusions (50).

6. The silencer for an air compressor according to claim 5, wherein The sound absorbing cavity (5) is provided with an inner side wall (51) opposite to the sound absorbing hole (61), and is provided with an inner side wall (52) parallel to the inner side wall (51), and the inner side wall (51) and the inner side wall (52) are provided with the sound wave reflection protrusions (50).

7. The silencer for an air compressor according to claim 1 or 2 or 3, characterized by The air inlet cavity (3) is provided with an air inlet pipe (7), one end of the air inlet pipe (7) is provided with an air inlet (70) communicated with the outside, and the other end of the air inlet pipe (7) is provided with an air outlet (71) communicated with the air inlet cavity (3).

8. The silencer for an air compressor according to claim 1, wherein The air outlet cavity (4) is provided with an exhaust pipe (8), both ends of the exhaust pipe (8) extend out of the outer shell (1), both ends of the exhaust pipe (8) are provided with exhaust ports (80), and the exhaust pipe (8) is provided with a plurality of sound absorbing holes (81) on the part in the air outlet cavity (4).

9. The silencer for an air compressor according to claim 1, wherein The inner wall of the air outlet cavity (4) is provided with a plurality of sound wave reflection protrusions (40).

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