Three-cavity expansion cavity silencing structure of Roots blower

Abstract

The utility model provides a Roots blower three-cavity expansion cavity noise reduction structure which comprises a Roots blower body, a separation air guide assembly arranged in an exhaust noise reduction pipe body, and a noise reduction assembly arranged in the exhaust noise reduction pipe body. Then the compressed air in the air guide pipe enters the third cavity through the communicating cavity to be collected, and then the air guide pieces conduct rectification, resistance reduction and noise reduction on irregular flowing airflow in the compressed air in the third cavity, so that the noise of the compressed air entering the exhaust pipe is reduced; noise transmitted into the second cavity can be absorbed and reduced by the first sound absorption layer, the sound insulation cavity and the second sound absorption layer, most noise of compressed air entering the third cavity can be isolated and reduced by the first sound insulation layer and the second sound insulation layer, and therefore the noise reduction and reduction capacity of the exhaust noise reduction pipe body is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of silencing of Roots blowers, in particular to a silencing structure of three-cavity expansion chambers of Roots blowers. Background Art

[0002] Roots blower is a positive displacement blower, with impeller end face, front and rear end covers of the blower. The principle is to use two blade-shaped rotors to make relative motion in the cylinder to compress and transport gas. This blower has a simple structure and is easy to manufacture. It is widely used in aquaculture oxygenation, sewage treatment aeration, cement transportation, and is more suitable for gas transportation and pressurization systems in low-pressure occasions. It can also be used as a vacuum pump, etc.

[0003] The publication number "CN211950867U" provides a bowl-type silencer for the air outlet of a Roots blower. When the noise passes through the elbow, the air medium is filtered, so that the force of the gas on the wall of the silencer tube is reduced, and the vibration is correspondingly reduced. At the same time, the energy is buffered by multiple silencer bowls, and the buffering of the silencer bowls is absorbed by the silencer cotton, making the silencer effect outstanding.

[0004] However, the above technical solutions and the prior art have the following defects:

[0005] Although the bowl-type silencer at the air outlet of the Roots blower can silence and reduce the noise of the compressed air discharged by the Roots blower through multiple silencer bowl buffers, the silencer structure cannot rectify the irregular flow airflow in the discharged compressed air, resulting in irregular airflow in the discharged compressed air. The irregular airflow not only increases the resistance to the discharge of the compressed air, but also easily produces collision noise with the cylinder wall. Therefore, the silencer and noise reduction effect needs to be improved. Utility Model Content

[0006] The utility model aims to provide a three-cavity expansion chamber silencer structure of a Roots blower to solve the problems raised in the above-mentioned background technology.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] A three-cavity expansion chamber silencer structure of a Roots blower, comprising an air intake silencer pipe, a Roots blower body, a support base, an exhaust silencer pipe body, an exhaust pipe and an exhaust pipe, wherein an air intake silencer pipe is installed at an air intake end of the upper end surface of the Roots blower body, a support base is fixedly connected to the bottom of the Roots blower body, an exhaust pipe is arranged at an air outlet end of the Roots blower body, an exhaust silencer pipe body is connected to the left end of the exhaust pipe, an exhaust silencer pipe body outlet is connected to the exhaust pipe, a partition air guide component is arranged inside the exhaust silencer pipe body, and the partition air guide component is used to reduce the airflow noise of the discharged compressed air, a silencer component is arranged inside the exhaust silencer pipe body, and the silencer component is used to improve the sound absorption and noise reduction capability of the exhaust silencer pipe body.

[0009] Preferably, the partitioning air guide component includes a first partition, an air guide pipe, a second partition, a sound guide hole, a third chamber, a second chamber and a first chamber, the first partition is fixedly connected to the right side of the exhaust silencer pipe body, the second partition is fixedly connected to the left side of the exhaust silencer pipe body, an air guide pipe is fixedly connected between the first partition and the second partition, a plurality of sound guide holes are opened on the annular side of the air guide pipe, a first chamber is opened on the right side of the exhaust silencer pipe body, a second chamber is opened inside the exhaust silencer pipe body, and a third chamber is opened on the left side of the exhaust silencer pipe body.

[0010] Preferably, the sound-absorbing assembly includes a sound-absorbing panel, a first sound insulation layer, an air guide plate and a first sound-absorbing layer; the sound-absorbing panel is bonded to the right end surface of the first partition plate, the first sound-absorbing layer is arranged inside the second chamber, the first sound insulation layer is arranged inside the third chamber, and the air guide plate is fixedly connected to the left side of the inner wall of the first sound insulation layer.

[0011] Preferably, a second sound insulation layer is provided on the outer surface of the first sound insulation layer, the first sound insulation layer is made of polyester sound-absorbing cotton, and the second sound insulation layer is made of damping sound insulation felt.

[0012] Preferably, a second sound absorbing layer is arranged between the first sound absorbing layer and the second cavity, a sound insulation cavity is opened between the second sound absorbing layer and the first sound absorbing layer, the first sound absorbing layer is made of sound-absorbing cotton, and the second sound absorbing layer is made of foam plastic.

[0013] Preferably, the first partition plate has conical through cavities symmetrically formed on both sides, and the second partition plate has connecting cavities symmetrically formed on both sides.

[0014] Preferably, circular through cavities are symmetrically opened on upper and lower sides inside the sound absorbing board, and the sound absorbing board is made of wave sponge.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] 1. In this structure, the compressed air entering the first chamber will pass through the circular through cavity and the conical through cavity and enter the air duct. At this time, most of the noise of the compressed air entering the air duct will be transmitted to the second chamber through multiple sound guide holes. Then the compressed air in the air duct will pass through the connecting cavity and enter the third chamber for flow collection. Then the air guide plate will rectify the irregular flow of the compressed air in the third chamber to reduce resistance and noise, thereby reducing the noise of the compressed air entering the exhaust pipe;

[0017] 2. In this structure, by bonding the sound-absorbing panel, the compressed air entering the first chamber is prevented from directly hitting the first baffle to generate noise, and the noise transmitted to the second chamber will be absorbed and reduced by the first sound-absorbing layer, the sound insulation cavity and the second sound-absorbing layer respectively, and the first sound insulation layer and the second sound insulation layer will isolate and silence most of the noise of the compressed air entering the third chamber, thereby improving the sound absorbing and noise reduction ability of the exhaust silencer pipe body. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the main structure of the utility model;

[0019] Figure 2 It is a front cross-sectional view of the air guide component and the muffler component separated in the utility model;

[0020] Figure 3 This is a structural diagram of the first baffle, the air guide pipe and the second baffle in the utility model;

[0021] Figure 4 This is a structural diagram of the second sound insulation layer, the first sound insulation layer and the air guide sheet in the utility model;

[0022] Figure 5 for Figure 2 A is an enlarged view of the middle image.

[0023] In the figure: 1. air intake silencer pipe; 2. Roots blower body; 3. support base; 4. exhaust silencer pipe body; 5. exhaust pipe; 6. partition air guide assembly; 61. first partition plate; 62. air guide pipe; 63. second partition plate; 64. sound guide hole; 65. third chamber; 66. second chamber; 67. first chamber; 68. conical through cavity; 69. connecting cavity; 7. silencer assembly; 71. sound absorbing board; 72. circular through cavity; 73. second sound insulation layer; 74. first sound insulation layer; 75. air guide plate; 76. first sound absorption layer; 77. sound insulation cavity; 78. second sound absorption layer; 8. outlet pipe. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] See also Figure 1-5 , the utility model provides a technical solution:

[0026] Embodiment 1:

[0027] A three-cavity expansion chamber silencer structure of a Roots blower comprises an air intake silencer pipe 1, a Roots blower body 2, a support base 3, an exhaust silencer pipe body 4, an exhaust pipe 5 and an air outlet pipe 8. An air intake silencer pipe 1 is installed at the air intake end of the upper end surface of the Roots blower body 2, and the air intake silencer pipe 1 facilitates external air to enter the interior of the Roots blower body 2. A support base 3 is fixedly connected to the bottom of the Roots blower body 2, and the support base 3 can stably support and position the Roots blower body 2. An air outlet pipe 8 is arranged at the air outlet end of the Roots blower body 2, and the air outlet pipe 8 can guide the compressed air delivered by the Roots blower body 2 into the exhaust silencer pipe body 4. The left end of the air outlet pipe 8 is connected to the exhaust silencer pipe body 4, and the exhaust silencer pipe body 4 can guide the compressed air into the exhaust pipe 5. The outlet of the exhaust silencer pipe body 4 is connected to the exhaust pipe 5, and the exhaust pipe 5 can discharge the silenced air to the outside.

[0028] A partition air guide component 6 is arranged inside the exhaust silencer pipe body 4, and the partition air guide component 6 is used to reduce the airflow noise of the discharged compressed air. A silencer component 7 is arranged inside the exhaust silencer pipe body 4, and the silencer component 7 is used to improve the sound absorption and noise reduction ability of the exhaust silencer pipe body 4.

[0029] The partitioning air guide assembly 6 includes a first partition 61, an air guide pipe 62, a second partition 63, a sound guide hole 64, a third chamber 65, a second chamber 66 and a first chamber 67. The first partition 61 is fixedly connected to the right side of the exhaust silencer tube body 4. The first partition 61 can not only separate the first chamber 67 and the second chamber 66, but also block the compressed air entering the exhaust silencer tube body 4. The second partition 63 is fixedly connected to the left side of the exhaust silencer tube body 4. The second partition 63 separates the second chamber 66 and the third chamber 65. An air guide pipe 62 is fixedly connected between the first partition 61 and the second partition 63. The air guide pipe 62 guides the air in the conical through cavity 68 to the connecting cavity 69.

[0030] A plurality of sound guide holes 64 are provided on the annular side of the air guide pipe 62, and the plurality of sound guide holes 64 have the same specifications. The plurality of sound guide holes 64 facilitate most of the air noise in the air guide pipe 62 to be transmitted to the second chamber 66. A first chamber 67 is provided on the right side of the exhaust silencer pipe body 4, and the first chamber 67 facilitates the air entering the exhaust silencer pipe body 4 to be distributed to the circular through cavity 72. A second chamber 66 is provided on the inside of the exhaust silencer pipe body 4, and the second chamber 66 can isolate the noise transmitted from the sound guide holes 64. A first chamber 67 is provided on the left side of the exhaust silencer pipe body 4. There are three chambers 65. The third chamber 65 can concentrate and guide the air discharged from the connecting chamber 69 to the exhaust pipe 5. The first partition plate 61 has conical through-cavities 68 symmetrically opened on the upper and lower sides. The conical through-cavity 68 is connected with the circular through-cavity 72 and the air duct 62. The conical through-cavity 68 can guide the circular through-cavity 72 to the air duct 62. The second partition plate 63 has connecting chambers 69 symmetrically opened on the upper and lower sides. The connecting chamber 69 is connected with the air duct 62 and the third chamber 65. The connecting chamber 69 can guide the air in the air duct 62 to the third chamber 65.

[0031] Embodiment 2:

[0032] On the basis of the first embodiment, in this embodiment, the sound-absorbing plate 71 is bonded to prevent the compressed air entering the first chamber 67 from directly hitting the first baffle to generate noise, and the noise transmitted to the second chamber 66 will be absorbed and reduced by the first sound-absorbing layer 76, the sound insulation cavity 77 and the second sound-absorbing layer 78 respectively, and the first sound insulation layer 74 and the second sound insulation layer 73 will isolate and silence most of the noise of the compressed air entering the third chamber 65, thereby improving the sound absorbing and noise reduction ability of the exhaust silencer pipe body 4.

[0033] The sound-absorbing component 7 includes a sound-absorbing plate 71, a first sound-insulating layer 74, an air guide sheet 75 and a first sound-absorbing layer 76. The sound-absorbing plate 71 is bonded to the right end surface of the first baffle 61. The sound-absorbing plate 71 is made of wave sponge. The sound-absorbing plate 71 made of wave sponge has sound-absorbing ability to prevent the compressed air entering the first chamber 67 from directly hitting the first baffle to generate noise. The second chamber 66 is provided with a first sound-absorbing layer 76. The first sound-absorbing layer 76 is made of sound-absorbing cotton. The first sound-absorbing layer 76 made of sound-absorbing cotton has good sound absorption, so as to absorb and silence most of the noise transmitted to the second chamber 66. The first sound-insulating layer 74 is provided inside the third chamber 65. The first sound-insulating layer 76 has good sound absorption. 4 is made of polyester sound-absorbing cotton. The first sound insulation layer 74 made of polyester sound-absorbing cotton has good sound absorption so as to absorb and silence most of the noise inside the third chamber 65. An air guide piece 75 is fixedly connected to the left side of the inner wall of the first sound insulation layer 74. Four groups of air guide pieces 75 are fixedly connected, and the four groups of air guide pieces 75 have the same specifications. The four groups of air guide pieces 75 are symmetrically fixedly connected to the upper and lower sides and the front and rear sides of the inner annular side of the first sound insulation layer 74 respectively. The four groups of air guide pieces 75 will rectify the irregular flow airflow discharged through the first sound insulation layer 74 into a regular flow airflow, reduce the number of rotations of the gas, and make it parallel to the central axis of the exhaust silencer pipe body 4, so as to achieve the purpose of reducing resistance and noise and rectifying.

[0034] A second sound insulation layer 73 is provided on the outer surface of the first sound insulation layer 74. The second sound insulation layer 73 is made of damping sound insulation felt. The second sound insulation layer 73 made of damping sound insulation felt can further isolate most of the noise inside the third chamber 65. A second sound absorption layer 78 is provided between the first sound absorption layer 76 and the second chamber 66. The second sound absorption layer 78 is made of foam plastic. The second sound absorption layer 78 made of foam plastic has good sound absorption, so as to further absorb and reduce the noise in the second chamber 66. A sound insulation cavity 77 is provided between the second sound absorption layer 78 and the first sound absorption layer 76. The sound insulation cavity 77 makes the second sound absorption layer 78 and the first sound absorption layer 76 more soundproof. Circular through cavities 72 are symmetrically provided on the upper and lower sides of the sound absorbing board 71. The circular through cavity 72 facilitates the compressed air in the first chamber 67 to enter the conical through cavity 68.

[0035] Working principle: During the operation of the Roots blower body 2, the air outlet pipe 8 will guide the compressed air inside the Roots blower body 2 to the exhaust silencer pipe body 4. At this time, the compressed air entering the first chamber 67 will be distributed to the circular through cavities 72 on the upper and lower sides under the obstruction of the first baffle 61 and the sound absorbing plate 71. At the same time, the sound absorbing plate 71 prevents the compressed air entering the first chamber 67 from directly hitting the first baffle to generate noise; then the compressed air in the circular through cavity 72 will pass through the conical through cavity 68 and enter the air guide pipe 62. At this time, most of the noise of the compressed air entering the air guide pipe 62 will be transmitted to the second chamber 66 through the multiple sound guide holes 64, and the noise transmitted to the second chamber 66 will first be absorbed and reduced by the first sound absorbing layer 76, and then the sound insulation cavity 77 will isolate the noise in the second chamber 66, and finally the second sound absorption layer 76 will absorb the noise. The sound layer 78 will absorb and reduce the noise in the second chamber 66 again, thereby preventing the noise in the second chamber 66 from being directly transmitted to the outside; then the compressed air in the air guide pipe 62 will pass through the connecting chamber 69 and enter the third chamber 65 for collection, and then the air guide plate 75 will rectify the irregular flow of the compressed air in the third chamber 65 into a regular flow, reducing the number of rotations of the gas and making it parallel to the central axis of the exhaust silencer pipe body 4, so as to achieve the purpose of resistance reduction and noise reduction rectification, and the rectified compressed air will be concentrated into the exhaust pipe 5, thereby preventing the compressed air entering the exhaust pipe 5 from having too loud noise. At the same time, most of the noise of the compressed air entering the third chamber 65 will be isolated and silenced by the first sound insulation layer 74 and the second sound insulation layer 73 respectively, thereby improving the sound silencing and noise reduction ability of the exhaust silencer pipe body 4.

[0036] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A three-chamber expansion chamber silencing structure of a Roots blower, comprising an air inlet silencing pipe (1), a Roots blower body (2), a support base (3), an exhaust silencing pipe body (4), an exhaust pipe (5) and an exhaust pipe (8), characterized in that: An air inlet silencer pipe (1) is installed at the air inlet end of the upper end surface of the Roots blower body (2); a support base (3) is fixedly connected to the bottom of the Roots blower body (2); an air outlet pipe (8) is arranged at the air outlet end of the Roots blower body (2); an exhaust silencer pipe body (4) is connected to the left end of the exhaust silencer pipe body (4); and an exhaust pipe (5) is connected to the outlet of the exhaust silencer pipe body (4); The exhaust silencer pipe body (4) is provided with a partition air guide component (6) inside, and the partition air guide component (6) is used to reduce the airflow noise of the discharged compressed air. The exhaust silencer pipe body (4) is provided with a silencer component (7) inside, and the silencer component (7) is used to improve the sound absorption and noise reduction capability of the exhaust silencer pipe body (4).

2. A three-cavity expansion chamber silencing structure of a Roots blower according to claim 1, characterized in that: The partition air guide component (6) comprises a first partition plate (61), an air guide pipe (62), a second partition plate (63), a sound guide hole (64), a third chamber (65), a second chamber (66) and a first chamber (67); the first partition plate (61) is fixedly connected to the right side of the exhaust silencer pipe body (4); the second partition plate (63) is fixedly connected to the left side of the exhaust silencer pipe body (4); an air guide pipe (62) is fixedly connected between the first partition plate (61) and the second partition plate (63); a plurality of sound guide holes (64) are provided on the annular side surface of the air guide pipe (62); a first chamber (67) is provided on the right side of the exhaust silencer pipe body (4); a second chamber (66) is provided inside the exhaust silencer pipe body (4); and a third chamber (65) is provided on the left side of the exhaust silencer pipe body (4).

3. A three-cavity expansion chamber silencing structure of a Roots blower according to claim 2, characterized in that: The noise reduction assembly (7) comprises a sound absorbing plate (71), a first sound insulation layer (74), an air guide piece (75) and a first sound absorbing layer (76); the sound absorbing plate (71) is bonded to the right end surface of the first partition plate (61); the first sound absorbing layer (76) is arranged inside the second chamber (66); the first sound insulation layer (74) is arranged inside the third chamber (65); and the air guide piece (75) is fixedly connected to the left side of the inner wall of the first sound insulation layer (74).

4. The three-cavity expansion chamber silencing structure of a Roots blower according to claim 3 is characterized in that: A second sound insulation layer (73) is arranged on the outer surface of the first sound insulation layer (74); the first sound insulation layer (74) is made of polyester sound-absorbing cotton, and the second sound insulation layer (73) is made of damping sound insulation felt.

5. The three-cavity expansion chamber silencing structure of a Roots blower according to claim 3 is characterized in that: A second sound absorbing layer (78) is arranged between the first sound absorbing layer (76) and the second chamber (66), a sound insulation cavity (77) is provided between the second sound absorbing layer (78) and the first sound absorbing layer (76), the first sound absorbing layer (76) is made of sound-absorbing cotton, and the second sound absorbing layer (78) is made of foam plastic.

6. The three-cavity expansion chamber silencing structure of a Roots blower according to claim 2 is characterized in that: The first partition plate (61) has conical through cavities (68) symmetrically formed on the upper and lower sides thereof, and the second partition plate (63) has connecting cavities (69) symmetrically formed on the upper and lower sides thereof.

7. The three-cavity expansion chamber silencing structure of a Roots blower according to claim 3 is characterized in that: Circular through cavities (72) are symmetrically provided on the upper and lower sides of the interior of the sound absorbing board (71), and the material of the sound absorbing board (71) is wave sponge.

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