Noise reduction device of roots vacuum pump

Abstract

The utility model discloses a Roots vacuum pump silencer, which belongs to the technical field of Roots vacuum pumps and comprises a silencer shell, a first cover plate is connected to the top end of the silencer shell, a second cover plate is connected to the bottom end of the silencer shell, and flanges fixedly penetrate through the center of the first cover plate and the center of the second cover plate and are used for being connected with a Roots vacuum pump. The two flanges are both communicated with the interior of the silencer shell, a silencing pipe is arranged at the top end of the second cover plate, the bottom end of the silencing pipe is communicated with the flange on the second cover plate, the outer wall of the silencing pipe is sleeved with a detachable silencing pipe outer sleeve, the outer side of the silencing pipe outer sleeve is sleeved with a silencing net, a sound absorption cavity is formed between the silencing net and the silencing pipe outer sleeve, and the outer wall of the silencing net is sleeved with a sound absorption cotton sleeve. According to the utility model, the noise reduction treatment is effectively carried out on the sound generated by the gas through the matching of the hush pipe and the hush pipe jacket, and the flow speed of the gas can be slowed down by the sound blocking cavity, so that the propagation path of the noise is prolonged, the attenuation effect of the sound absorbing cotton on the noise is enhanced, and the overall noise reduction performance is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of Roots vacuum pumps and belongs to a Roots vacuum pump silencer. Background Art

[0002] A vacuum pump is a device or apparatus that uses mechanical, physical, chemical, or physicochemical methods to evacuate a container to create a vacuum. Generally speaking, a vacuum pump is a device that uses various methods to create and maintain a vacuum in a closed space. A Roots vacuum pump is a type of vacuum pump that uses the pushing action of a pair of synchronously rotating, counter-rotating bladed rotors within the pump chamber to move gas and achieve vacuum. Specifically, the Roots vacuum pump operates as follows: two rotors are mounted perpendicularly on a pair of parallel shafts within the pump body. A pair of gears with a transmission ratio of 1 drive them in counter-rotating, synchronous motion. As the rotors rotate continuously, the pumped gas is drawn from the inlet into the space between the rotors and the pump casing and then discharged through the exhaust port. During operation, the gas in the pump chamber undergoes neither compression nor expansion. However, when the top of the rotor passes the edge of the exhaust port, connecting this space to the exhaust side, the gas pressure on the exhaust side is higher. Some gas is then forced back into the space, causing a sudden increase in pressure. Then, as the rotors continue to rotate, the gas is discharged from the pump. The gas of the Roots vacuum pump will generate considerable noise during transportation, so a muffler is needed to reduce the noise.

[0003] Existing silencers are usually composed of a shell, sound insulation cotton, and sound insulation board. For example, the prior art publication number CN218030634U is a silencing and noise reduction device for a large Roots vacuum pump. The utility model includes a soundproofing chamber body, a manhole cover, soundproofing cotton, a sound insulation board, a sound insulation board slot and a centrifugal fan. The soundproofing chamber body and the manhole cover are both concrete structures. The soundproofing chamber body is provided with an air inlet and an air outlet, and the air inlet and the air outlet are arranged diagonally. The air inlet is used to connect with the air outlet of the Roots vacuum pump, and the air outlet is used to connect with the centrifugal fan. It can convert high-frequency noise into low-frequency noise. It has a simple structure and low manufacturing cost, which can greatly save the company's noise reduction cost for the Roots vacuum pump.

[0004] At present, the silencers used in vacuum pumps of most companies only use silencer cotton to silence noise. Most gases are discharged directly without obstruction, which will result in a shorter sound wave stroke and thus cannot reduce the noise generated by the vacuum pump. Based on this, the utility model provides a Roots vacuum pump silencer with high noise reduction effect. Utility Model Content

[0005] To this end, the utility model provides a Roots vacuum pump silencer to solve the problem in the prior art that only silencer cotton is used for silencing, and most gases are discharged directly without being blocked, resulting in a short sound wave travel and low noise reduction effect.

[0006] In order to achieve the above purpose, the present invention provides the following technical solutions:

[0007] A Roots vacuum pump silencer device comprises a silencer housing, the top end of the silencer housing is connected to a cover plate 1, the bottom end of the silencer housing is connected to a cover plate 2, flanges are fixedly passed through the centers of the cover plate 1 and the cover plate 2, the flanges are used to connect the Roots vacuum pump, and the two flanges are both connected to the interior of the silencer housing, a silencer pipe is provided at the top end of the cover plate 2, the bottom end of the silencer pipe is connected to the flange on the cover plate 2, the outer wall of the silencer pipe is provided with a detachable silencer pipe jacket, the outer side of the silencer pipe jacket is provided with a silencer net, a sound-absorbing cavity is formed between the silencer net and the silencer pipe jacket, the outer wall of the silencer net is provided with a sound-absorbing cotton sleeve, and the sound-absorbing cotton sleeve is provided below the cover plate 1.

[0008] Furthermore, the outer wall of the silencer is provided with a plurality of sound-proof cavities, which are distributed in a circular array on the silencer, and each sound-proof cavity is connected to the interior of the silencer. The plurality of sound-proof cavities can slow down the gas flow speed, weaken the noise, and reduce the noise generated by air vibration.

[0009] Furthermore, the cross-section of each sound-resistance cavity is configured to be arc-shaped, and multiple sound-resistance cavities can greatly improve the noise reduction effect.

[0010] Furthermore, the outer wall of the silencer net is provided with a plurality of air guide holes, which are distributed in a circular array on the silencer net. The air can be dispersed and flowed by utilizing the plurality of air guide holes, thereby further slowing down the flow speed of the gas and further improving the noise reduction effect.

[0011] Furthermore, a silencer net cover is fixedly provided on the top of the silencer net, and the silencer net cover is arranged inside the sound-absorbing cotton cover. The silencer net cover is used to guide the gas ejected from the top of the silencer pipe to flow in all directions, thereby slowing down the flow speed of the gas and further reducing the noise.

[0012] Furthermore, the bottom end of the silencer pipe sleeve contacts the inner wall of the top of the cover plate 2, and the silencer pipe sleeve and the cover plate 2, the silencer net and the cover plate 2, and the cover plate 1 and the cover plate 2 and the muffler shell are all detachably fixed together by multiple bolts, which facilitates the replacement of the cover plate 1, the cover plate 2, the silencer pipe, the silencer pipe sleeve, the silencer net, and the sound-absorbing cotton sleeve.

[0013] Furthermore, a rubber sealing ring is fixedly provided on one side of the cover plate 1 and the cover plate 2 close to each other. The rubber sealing ring is sleeved on the outside of the flange and contacts the inner wall of the muffler shell. The rubber sealing ring is used to improve the sealing between the cover plate 1, the cover plate 2 and the muffler shell, thereby avoiding air leakage and reducing the spread of noise.

[0014] Furthermore, an annular sound insulation felt is fixedly provided on the inner wall of the muffler shell, and the annular sound insulation felt is sleeved on the outside of the sound-absorbing cotton sleeve. The annular sound insulation felt can block the propagation of noise, thereby further improving the noise reduction effect of the muffler device.

[0015] The utility model has the following advantages:

[0016] 1. The utility model effectively reduces the noise generated by the gas through the cooperation of the silencer tube and the silencer tube jacket. The sound-blocking cavity can slow down the gas flow speed, thereby extending the noise propagation path, enhancing the noise attenuation effect of the sound-absorbing cotton, and thus improving the overall noise reduction performance.

[0017] 2. The noise reduction effect of the silencer can be further improved by blocking the propagation of noise with an annular sound insulation felt, and a rubber sealing ring is provided to improve the sealing between the cover plate 1, the cover plate 2 and the silencer shell, which can not only prevent gas leakage, but also reduce noise propagation, further reducing the spread of noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are merely illustrative, and those skilled in the art can, without inventive effort, derive other implementation drawings based on the provided drawings.

[0019] The structures, proportions, sizes, etc. illustrated in this specification are intended solely to complement the contents disclosed herein and to facilitate understanding and reading by persons familiar with the art. They are not intended to limit the conditions under which the present invention may be implemented and therefore have no substantive technical significance. Any structural modifications, changes in proportions, or adjustments in size, without affecting the efficacy and objectives of the present invention, shall remain within the scope of the technical contents disclosed herein.

[0020] Figure 1 A schematic diagram of the overall structure provided by the utility model;

[0021] Figure 2 A cross-sectional view provided for the present utility model;

[0022] Figure 3 for Figure 2 The main view;

[0023] Figure 4 This is a structural diagram of the silencer pipe and silencer pipe jacket provided by the utility model;

[0024] Figure 5 This is a structural diagram of the silencer net and sound-absorbing cotton sleeve provided by the utility model.

[0025] In the figure: 1. Silencer shell; 2. Cover plate 1; 3. Cover plate 2; 4. Flange; 5. Silencer pipe; 6. Silencer pipe outer sleeve; 7. Silencer net; 8. Sound-absorbing cavity; 9. Sound-absorbing cotton sleeve; 10. Sound-proof cavity; 11. Air guide hole; 12. Silencer net cover; 13. Rubber sealing ring; 14. Annular sound insulation felt. DETAILED DESCRIPTION

[0026] The following describes the implementation of the present invention through specific embodiments. Those skilled in the art can readily understand the other advantages and benefits of the present invention from the contents disclosed in this specification. Obviously, the embodiments described are only a portion of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are also within the scope of protection of the present invention.

[0027] Refer to the instruction manual Figure 1-5 The utility model provides a Roots vacuum pump silencer device, including a silencer housing 1, a cover plate 1 2 is connected to the top of the silencer housing 1, a cover plate 2 3 is connected to the bottom of the silencer housing 1, and flanges 4 are fixedly passed through the centers of the cover plates 1 2 and 2 3. The flanges 4 are used to connect the Roots vacuum pump, and the two flanges 4 are both connected to the interior of the silencer housing 1.

[0028] A silencer pipe 5 is provided at the top of the cover plate 2 3, and the bottom end of the silencer pipe 5 is connected to the flange 4 on the cover plate 2 3. The outer wall of the silencer pipe 5 is provided with a detachable silencer pipe jacket 6, and the outer side of the silencer pipe jacket 6 is provided with a silencer net 7. A sound-absorbing cavity 8 is formed between the silencer net 7 and the silencer pipe jacket 6. The outer wall of the silencer net 7 is provided with a sound-absorbing cotton sleeve 9, and the sound-absorbing cotton sleeve 9 is provided under the cover plate 1 2.

[0029] A plurality of sound-blocking cavities 10 are provided on the outer wall of the silencer 5. The plurality of sound-blocking cavities 10 are distributed in a circular array on the silencer 5, and each sound-blocking cavity 10 is connected to the interior of the silencer 5. The plurality of sound-blocking cavities 10 can slow down the flow rate of the gas, weaken the noise, and reduce the noise generated by air vibration. The cross-section of each sound-blocking cavity 10 is set to be arc-shaped, and the arc-shaped sound-blocking cavity 10 can greatly improve the noise reduction effect.

[0030] A plurality of air guide holes 11 are provided on the outer wall of the silencer net 7. The plurality of air guide holes 11 are distributed in a circular array on the silencer net 7. The plurality of air guide holes 11 can disperse the air flow, thereby further slowing down the flow speed of the gas and further improving the noise reduction effect.

[0031] A silencer net cover 12 is fixed on the top of the silencer net 7, and the silencer net cover 12 is arranged inside the sound-absorbing cotton sleeve 9. The silencer net cover 12 is used to guide the gas ejected from the top of the silencer pipe 5 to flow around, so as to slow down the flow speed of the gas and further reduce the noise.

[0032] When in use, the flange 4 on the cover plate 2 3 is connected to the Roots vacuum pump, and the air first flows into the silencer 5 through the flange 4. The multiple sound-proof cavities 10 can slow down the gas flow speed and reduce the noise generated by air vibration. The air discharged from the sound-proof cavity 10 is discharged into the sound-absorbing cavity 8 through the silencer jacket 6, and at the same time will be blocked by the silencer net 7, thereby increasing the air flow range. The air will be guided by the air guide holes 11 on the cover plate and the silencer net 7 and pass through the sound-absorbing cotton sleeve 9, so as to further weaken the noise and improve the noise reduction effect of the silencer. Finally, the air is discharged from the flange 4 on the cover plate 2.

[0033] Refer to the instruction manual Figure 1-5 The bottom end of the silencer pipe sleeve 6 contacts the inner wall of the top of the cover plate 2 3. The silencer pipe sleeve 6 and the cover plate 2 3, the silencer net 7 and the cover plate 2 3, and the cover plate 1 2 and the cover plate 2 3 and the muffler housing 1 are all detachably fixed together by multiple bolts, which facilitates the replacement of the cover plate 1 2, the cover plate 2 3, the silencer pipe 5, the silencer pipe sleeve 6, the silencer net 7, and the sound-absorbing cotton sleeve 9.

[0034] A rubber sealing ring 13 is fixedly provided on the side close to the cover plate 1 2 and the cover plate 2 3. The rubber sealing ring 13 is sleeved on the outside of the flange 4 and contacts the inner wall of the muffler housing 1. The rubber sealing ring 13 is used to improve the sealing between the cover plate 1 2, the cover plate 2 3 and the muffler housing 1, thereby avoiding air leakage and reducing the spread of noise.

[0035] An annular sound insulation felt 14 is fixedly provided on the inner wall of the muffler housing 1, and the annular sound insulation felt 14 is sleeved on the outside of the sound-absorbing cotton sleeve 9. The annular sound insulation felt 14 can block the propagation of noise, thereby further improving the noise reduction effect of the muffler device.

[0036] By arranging an annular sound insulation felt 14 on the inner wall of the silencer housing 1, the annular sound insulation felt 14 can block the propagation of noise, thereby further improving the noise reduction effect of the silencer, and a rubber sealing ring 13 is arranged between the cover plate 1 2, the cover plate 2 3 and the silencer housing 1. The rubber sealing ring 13 can improve the sealing between the cover plate 1 2, the cover plate 2 3 and the silencer housing 1, thereby further reducing the propagation of noise. When the device is not in use, first loosen the bolts between the cover plate 2 3 and the silencer housing, and after removing the cover plate 2 3, the sound-absorbing cotton sleeve 9 and the silencer net 7 can be removed, and then the silencer pipe outer sleeve 6 and the silencer pipe 5 can be removed, and the silencer pipe 5, the silencer net 7 and the sound-absorbing cotton sleeve 9 can be checked and replaced.

[0037] Although the present invention has been described in detail above using general descriptions and specific embodiments, it will be apparent to those skilled in the art that modifications or improvements may be made to the present invention. Therefore, such modifications or improvements, without departing from the spirit of the present invention, are within the scope of protection claimed herein.

Claims

1. A Roots vacuum pump silencer, characterized by: The muffler housing (1) comprises a cover plate 1 (2) connected to the top of the muffler housing (1), a cover plate 2 (3) connected to the bottom of the muffler housing (1), a flange (4) fixedly passing through the center of each of the cover plate 1 (2) and the cover plate 2 (3), the flange (4) being used to connect to a Roots vacuum pump, and both flanges (4) being in communication with the interior of the muffler housing (1); The top of the second cover plate (3) is provided with a silencer pipe (5), the bottom end of the silencer pipe (5) is communicated with the flange (4) on the second cover plate (3), the outer wall of the silencer pipe (5) is provided with a detachable silencer pipe outer sleeve (6), the outer side of the silencer pipe outer sleeve (6) is provided with a silencer net (7), a sound absorption cavity (8) is formed between the silencer net (7) and the silencer pipe outer sleeve (6), the outer wall of the silencer net (7) is provided with a sound absorbing cotton sleeve (9), and the sound absorbing cotton sleeve (9) is provided below the first cover plate (2).

2. The Roots vacuum pump silencer according to claim 1, characterized in that: The outer wall of the muffler pipe (5) is provided with a plurality of sound-resistance cavities (10), which are distributed in a circular array on the muffler pipe (5), and each sound-resistance cavity (10) is communicated with the interior of the muffler pipe (5).

3. The Roots vacuum pump silencer according to claim 2, characterized in that: The cross section of each sound-resistance cavity (10) is arranged to be arc-shaped.

4. The Roots vacuum pump silencer according to claim 1, characterized in that: The outer wall of the silencer net (7) is provided with a plurality of air guide holes (11), and the plurality of air guide holes (11) are distributed in a ring array on the silencer net (7).

5. The Roots vacuum pump silencer according to claim 1, characterized in that: A sound-absorbing net cover (12) is fixedly provided on the top of the sound-absorbing net (7), and the sound-absorbing net cover (12) is arranged inside the sound-absorbing cotton sleeve (9).

6. The Roots vacuum pump silencer according to claim 1, characterized in that: The bottom end of the silencer pipe outer sleeve (6) contacts the inner wall of the top of the second cover plate (3), and the silencer pipe outer sleeve (6) and the second cover plate (3), the silencer net (7) and the second cover plate (3), and the first cover plate (2), the second cover plate (3) and the silencer housing (1) are all detachably fixed together by a plurality of bolts.

7. The Roots vacuum pump silencer according to claim 1, characterized in that: A rubber sealing ring (13) is fixedly provided on one side of the cover plate 1 (2) and the cover plate 2 (3) close to each other. The rubber sealing ring (13) is sleeved on the outside of the flange (4) and contacts the inner wall of the muffler housing (1).

8. The Roots vacuum pump silencer according to claim 1, characterized in that: An annular sound insulation felt (14) is fixedly provided on the inner wall of the muffler housing (1), and the annular sound insulation felt (14) is sleeved on the outside of the sound-absorbing cotton sleeve (9).

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