Silencer and electric vacuum pump

Abstract

The present application relates to the technical field of sound attenuation, and provides a silencer and an electric vacuum pump. The silencer comprises: first sound attenuation pieces and second sound attenuation pieces which are alternately stacked, the first sound attenuation pieces are provided with dispersed first flow guide channels, and the second sound attenuation pieces are provided with concentrated second flow guide channels; and an exhaust piece which is provided with an exhaust hole, the edge of the exhaust piece is connected with the edge of each sound attenuation piece, and the silencer forms a three-dimensional labyrinthine sound attenuation path to the exhaust hole through the first flow guide channels and the second flow guide channels alternately from an air inlet. The silencer of the present application can effectively reduce the noise level through the three-dimensional labyrinthine sound attenuation path, and when the silencer of the present application is assembled to the electric vacuum pump, the NVH problem of the electric vacuum pump can be effectively improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sound attenuation, in particular to a sound attenuator and an electric vacuum pump. BACKGROUND

[0002] In a scenario where air dynamic noise needs to be attenuated, a sound attenuator can be used to reduce the noise level. For example, an exhaust port of an electric vacuum pump of a vehicle is usually provided with a sound attenuator to achieve noise reduction.

[0003] Current sound attenuators usually use some sound-absorbing materials to reduce noise, or set some planar blocking structures to reduce noise, and the noise reduction level is very limited, which cannot meet the noise reduction requirements of electric vacuum pumps and other devices.

[0004] It should be noted that the information disclosed in the above background section is only used to strengthen the understanding of the background of the present application, and therefore can include information that does not constitute prior art known to those of ordinary skill in the art. SUMMARY

[0005] Therefore, the present application provides a sound attenuator which can effectively reduce the noise level through a three-dimensional maze sound attenuation path, and can effectively improve the NVH (Noise, Vibration and Harshness) problem of an electric vacuum pump when the sound attenuator is assembled to the electric vacuum pump.

[0006] One aspect of the present application provides a sound attenuator, comprising: first sound attenuation members and second sound attenuation members alternately stacked, the first sound attenuation members being provided with dispersed first flow guide channels, and the second sound attenuation members being provided with convergent second flow guide channels; an exhaust member provided with an exhaust hole, the edge of the exhaust member being connected with the edge of each sound attenuation member, and the sound attenuator forming a three-dimensional maze sound attenuation path leading to the exhaust hole through the first flow guide channels and the second flow guide channels alternately from an air inlet.

[0007] In some embodiments, the first flow guide channel comprises: a first flow guide surface distributed downstream of the edge of the first sound attenuation member; an air inlet cavity provided upstream of the first flow guide surface; and a notch distributed on the side wall of the air inlet cavity.

[0008] In some embodiments, the second flow guide channel comprises: a second flow guide surface distributed upstream of the edge of the second sound attenuation member; and an air outlet hole provided downstream of the second flow guide surface and aligned with the adjacent air inlet cavity.

[0009] In some embodiments, the edge of the second sound attenuation member is provided with a first flange; the edge of the first sound attenuation member is gap-fitted with the corresponding first flange, and the edge of the exhaust member is sealingly fitted with the corresponding first flange and between the first flanges.

[0010] In some embodiments, the rim of the first muffler is connected to the corresponding first flange by a snap connection, the rim of the exhaust member is connected to the corresponding first flange by a guide pin connection, and the first flanges are connected by a guide pin connection.

[0011] In some embodiments, the first muffler is made of a porous material, the first flow guide channel includes pores dispersed in the porous material, and the second flow guide channel includes pores concentrated in the central region or the corner region of the second muffler.

[0012] In some embodiments, the rim of the second muffler is provided with a second flange, the rim of the first muffler abuts the second flange, and the rim of the exhaust member is sealingly connected to the second flange.

[0013] In some embodiments, the muffler further comprises a reinforcing rib provided on the outer wall of the flange.

[0014] In some embodiments, the exhaust member is provided with a protruding rib on the path to the exhaust hole.

[0015] In some embodiments, the muffler further comprises a one-way valve provided in the exhaust hole or in the second flow guide channel adjacent to the exhaust hole.

[0016] Another aspect of the present application provides an electric vacuum pump configured with the muffler according to any of the above embodiments; wherein the air inlet of the muffler is in communication with the air outlet of the electric vacuum pump.

[0017] The present application has at least the following advantages compared with the prior art:

[0018] The muffler of the present application forms a three-dimensional labyrinthine sound attenuation path for alternately dispersing and concentrating gas by alternately stacking the first muffler provided with dispersed first flow guide channels and the second muffler provided with concentrated second flow guide channels, effectively reducing the pressure and noise of the gas, and effectively guiding the gas to reduce vibration and noise.

[0019] When the muffler of the present application is assembled to an electric vacuum pump, the noise level of the electric vacuum pump can be reduced to below 70db, effectively improving the NVH problem of the electric vacuum pump.

[0020] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0021] The accompanying drawings, which are incorporated herein and form a part of the specification, illustrate embodiments consistent with the present application and, together with the description, further serve to explain the principles of the application. It is to be noted, however, that the appended drawings illustrate only typical embodiments of this application and are therefore not to be considered limiting of its scope, for the application can admit to other equally effective embodiments.

[0022] Figure 1 Fig. 1 shows a structural schematic diagram of an acoustic muffler according to an embodiment of the present application;

[0023] Figure 2 Fig. 2 shows a structural schematic diagram of another acoustic muffler according to an embodiment of the present application; Figure 1 Fig. 3 shows a sound attenuation path schematic diagram of the acoustic muffler shown in Fig. 2;

[0024] Figure 3 Fig. 4 shows a structural schematic diagram of still another acoustic muffler according to an embodiment of the present application;

[0025] Figure 4 Fig. 5 shows a structural schematic diagram of still another acoustic muffler according to an embodiment of the present application; Figure 3 Fig. 6 shows a sound attenuation path schematic diagram of the acoustic muffler shown in Fig. 5. DETAILED DESCRIPTION

[0026] Example implementations will now be described with reference to the drawings; however, these implementations are merely examples and are not intended to limit the present application. The present application can be implemented in numerous ways, including as a process, an apparatus, a system, a device or a method. Several implementations of the present application are described below.

[0027] The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application, and together with the description serve to explain the principles of the present application. It is to be understood that the drawings are for illustration only and changes can be made to the details or arrangements of all or aspects of the drawings without departing from the scope of the application as set forth in the claims.

[0028] The terms "first", "second", and similar terms do not denote any order, quantity, or importance, but are used to identify different components. In addition, the terms "upper", "lower", and the like in the description and the claims refer to the orientation or position of the device or element shown in the drawings, and are used only to facilitate the description and to simplify the description, and do not indicate or imply that the device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present application.

[0029] It should be noted that the embodiments of the present application and the features in different embodiments can be combined with each other without conflict.

[0030] Figure 1 Fig. 1 shows a structural schematic diagram of an acoustic muffler according to an embodiment of the present application, Figure 2 Fig. 2 shows a structural schematic diagram of another acoustic muffler according to an embodiment of the present application; Figure 1 Fig. 3 shows a sound attenuation path schematic diagram of the acoustic muffler shown in Fig. 2; Figure 3This invention illustrates the structure of yet another silencer in an embodiment of the invention. Figure 4 Show Figure 3 The silencer path shown is for the muffler; combined with Figures 1 to 4 As shown, the muffler provided in this embodiment of the invention includes:

[0031] Alternating stacked first and second mufflers 10, the first muffler 10 is provided with dispersed first flow channels (see... Figure 1 and Figure 3 The first muffler 10 (marked with an arrow) and the second muffler 20 are provided with a converging second flow channel (see...). Figure 1 and Figure 3 (The arrow marked on the second muffler 20);

[0032] The exhaust component 30 is provided with an exhaust port 33. The edge of the exhaust component 30 is connected to the edge of each muffler component. The muffler forms a three-dimensional labyrinthine muffler path P from the air inlet 800 through alternating first and second guide channels to the exhaust port 33.

[0033] exist Figure 1 and Figure 2 In the muffler shown, the inlet of the first flow channel of the first muffler 10 at the top layer forms an air inlet 800. When gas enters the muffler cavity from the air inlet 800, it is first dispersed and guided by the topmost first muffler 10 to reduce pressure and noise. The second muffler 20 of the second layer is used to gather and guide the gas, so that the gas passes through the three-dimensional labyrinth corner formed by the topmost first muffler 10 and the second muffler 20 to increase the airflow resistance and achieve the sound reduction effect. Then, the gas is dispersed and guided by the third first muffler 10 to further reduce pressure and noise. It then passes through the three-dimensional labyrinth corner formed by the third first muffler 10 and the fourth second muffler 20 to enhance the sound reduction effect. Finally, it is gathered and guided by the fourth second muffler 20 to the chamber of the exhaust 30 and discharged through the exhaust port 33. By alternating between the first and second flow channels, the gas entering the muffler cavity not only undergoes a three-dimensional labyrinthine path of dispersion → convergence → dispersion → convergence to fully reduce pressure and noise, but also reduces vibration and noise through the flow guidance effect, thus effectively reducing the noise level to the expected range.

[0034] exist Figure 3 and Figure 4The inlet of the second flow guide channel of the second sound attenuation member 20 on the top layer forms the air inlet 800. When the gas enters the muffler cavity from the air inlet 800, it is first gathered and guided by the uppermost second sound attenuation member 20, then is fully depressurized and noise-reduced under the dispersion and guiding effect of the first sound attenuation member 10 on the second layer, and then is gathered and guided by the second sound attenuation member 20 on the third layer. The dispersion and gathering of the gas in the muffler cavity through the upper and lower alternating dispersion and gathering of the gas increases the air flow resistance and depressurizes and noise-reduces the gas to achieve the silencing effect. Then, the gas further depressurizes and noise-reduces under the dispersion and guiding effect of the first sound attenuation member 10 on the fourth layer, enters the chamber of the exhaust member 30, and is finally discharged through the exhaust hole 33. Through the alternating second flow guide channel and first flow guide channel, the gas entering the muffler cavity not only passes through the three-dimensional labyrinthine bypass path of gathering-dispersion-gathering-dispersion to fully depressurize and noise-reduce the gas, but also reduces the noise of the gas through the guiding effect, so that the noise level is effectively reduced to the expected range.

[0035] It should be noted that, Figures 1 to 4 Only the structures of two kinds of mufflers in the embodiments of the present application are schematically shown; in other embodiments, the number, stacking order, etc. of the first sound attenuation member 10 and the second sound attenuation member 20 can be adjusted according to actual conditions, and the present application is not limited to Figures 1 to 4 the structures shown.

[0036] The muffler of the present application forms a three-dimensional labyrinthine sound attenuation path P for alternately dispersing and gathering the gas through the alternately stacked first sound attenuation member 10 and second sound attenuation member 20, and the first sound attenuation member 10 is provided with a dispersed first flow guide channel and the second sound attenuation member 20 is provided with a gathered second flow guide channel. The muffler not only effectively depressurizes and noise-reduces the gas, but also effectively guides the gas to reduce the noise.

[0037] Referring to Figure 1 and Figure 2 In some embodiments, the first flow guide channel includes: a first flow guide surface 11, the downstream of the first flow guide surface 11 being distributed on the edge of the first sound attenuation member 10; an air inlet cavity 12, provided upstream of the first flow guide surface 11; and a gap 13, distributed on the side wall of the air inlet cavity 12.

[0038] After the gas enters the air inlet cavity 12, it is dispersed and flows out through the gap 13, is guided and noise-reduced along the first flow guide surface 11, and enters the chamber of the adjacent second sound attenuation member 20 from the edge of the first sound attenuation member 10. The first flow guide surface 11 can be formed in the form of a curved surface, an arc surface, an inclined surface, etc. to guide and noise-reduce the gas.

[0039] Continuing to refer to Figure 1 and Figure 2As shown, in some embodiments, the second flow guide channel includes a second flow guide surface 21 distributed on the edge of the second muffler 20 upstream; and an air outlet hole 22 arranged downstream of the second flow guide surface 21 and aligned with the adjacent air inlet cavity 12.

[0040] The gas can enter the chamber of the second muffler 20 from the edge of the second muffler 20, be flow-guided and damped along the second flow guide surface 21, and enter the adjacent air inlet cavity 12 from the air outlet hole 22. The second flow guide surface 21 can be formed in a curved surface, an arc surface, an inclined surface, etc. to flow guide and damp the gas.

[0041] Continuing to refer to Figure 1 and Figure 2 As shown, in some embodiments, the edge of the second muffler 20 is provided with a first flange 25; the edge of the first muffler 10 is gap-fitted with the corresponding first flange 25, and the edge of the exhaust member 30 is sealing-fitted with the corresponding first flange 25 and between the first flanges 25.

[0042] The edge of the exhaust member 30 is sealing-fitted with the first flange 25 and between the first flanges 25 to form a sealed housing of the muffler; the first flanges 25 can be tightly fitted by means of a sealing ring 26. The edge of the first muffler 10 is gap-fitted with the first flange 25 to form a gap for flow guide.

[0043] Continuing to refer to Figure 1 and Figure 2 As shown, in some embodiments, the edge of the first muffler 10 is connected with the corresponding first flange 25 by means of a buckle 18, and the edge of the exhaust member 30 is connected with the corresponding first flange 25 and between the first flanges 25 by means of a guide pin 40.

[0044] The buckle 18 enables the first muffler 10 to be tightly fitted with the second muffler 20, and the guide pin 40 facilitates the positioning and fitting of the exhaust member 30 and the second muffler 20.

[0045] Referring to Figure 3 and Figure 4 As shown, in some embodiments, the first muffler 10 is made of a porous material, and the first flow guide channel includes air holes (not specifically shown in the figure) scattered in the porous material; and the second flow guide channel includes air holes 28 arranged in the central region or corner region of the second muffler 20.

[0046] The first muffler 10 can be made of sponge or other suitable porous materials to effectively reduce the pressure and noise of the gas.

[0047] Continuing to refer to Figure 3 and Figure 4As shown in some embodiments, the edge of the second muffler 20 is provided with a second flange 29; the edge of the first muffler 10 abuts against the second flange 29, and the edge of the exhaust member 30 is sealingly connected to the second flange 29.

[0048] The edge of the exhaust member 30 is sealingly connected to the second flange 29, forming a sealed housing of the muffler; the edge of the first muffler 10 abuts against the second flange 29, so that the gas is diffused through the gas holes in the first muffler 10 to achieve sufficient pressure reduction and noise reduction.

[0049] Referring to Figure 1 and Figure 3 As shown in some embodiments, the muffler further comprises a reinforcing rib 50 provided on the outer wall of the flange. By means of the reinforcing rib 50, the radiation noise is reduced.

[0050] In combination with Figures 1 to 4 As shown in some embodiments, the exhaust member 30 is provided with a convex rib 36 on the path leading to the exhaust hole 33. By means of the convex rib 36, the air flow resistance is further increased before the gas is discharged from the muffler, so as to enhance the noise reduction effect.

[0051] In combination with Figures 1 to 4 As shown in some embodiments, the muffler further comprises a one-way valve 60 provided on the exhaust hole 33 or on the second flow channel adjacent to the exhaust hole 33.

[0052] By means of the one-way valve 60 provided at the bottom of the muffler, the gas in the muffler is allowed to be discharged, while preventing external water vapor from entering the muffler.

[0053] The embodiments of the present application also provide an electric vacuum pump provided with the muffler as described in any of the above embodiments; wherein the gas inlet 800 of the muffler is in communication with the gas outlet of the electric vacuum pump.

[0054] The electric vacuum pump provided with the muffler of the present application is tested, and the noise level in front of the electric vacuum pump is reduced from the original 75.3db to 64.7db, and the noise level at the side of the electric vacuum pump is reduced from the original 76.6db to 69.8db. In this way, the overall noise level of the electric vacuum pump can be effectively reduced to below 70db, thereby effectively improving the NVH problem of the electric vacuum pump.

[0055] In addition to the electric vacuum pump, the muffler of the present application can also be applied to other pneumatic devices, and can also effectively improve the noise level.

[0056] In summary, the muffler of the present application, by alternately stacking the first sound attenuation member 10 and the second sound attenuation member 20, and the first sound attenuation member 10 being provided with the dispersed first flow guide channels and the second sound attenuation member 20 being provided with the converged second flow guide channels, forms a three-dimensional labyrinth sound attenuation path P that alternately disperses and converges the gas, effectively achieving pressure reduction and noise reduction of the gas, and effectively guiding the gas to achieve shock absorption and noise reduction.

[0057] The muffler of the present application can be configured in a pneumatic device such as an electric vacuum pump, and can effectively reduce the noise level of the pneumatic device such as an electric vacuum pump.

[0058] The above is a further detailed description of the present application in combination with specific preferred embodiments, and cannot be considered as limiting the specific implementation of the present application to these descriptions. For ordinary skilled persons in the technical field to which the present application belongs, a number of simple deductions or substitutions can be made without departing from the concept of the present application, and all of them should be considered as falling within the protection scope of the present application.

Claims

1. A muffler characterized by comprising: The muffler comprises: alternately stacked first and second sound-absorbing members, the first sound-absorbing member being provided with dispersed first flow guide channels, and the second sound-absorbing member being provided with concentrated second flow guide channels; wherein the first sound-absorbing member is made of porous material, and the first flow guide channels comprise air holes dispersed in the porous material; and the second flow guide channels comprise air holes concentratedly arranged in the central region or corner region of the second sound-absorbing member; an exhaust member provided with an exhaust hole, the edge of the exhaust member being connected with the edge of each sound-absorbing member, and the muffler forming a three-dimensional labyrinthine sound-absorbing path from the air inlet to the exhaust hole through the first and second flow guide channels alternately; a one-way valve arranged in the exhaust hole or in the second flow guide channel adjacent to the exhaust hole.

2. The muffler of claim 1, wherein The edge of the second sound-absorbing member is provided with a second flange; the edge of the first sound-absorbing member abuts against the second flange, and the edge of the exhaust member is sealingly connected with the second flange.

3. The muffler of claim 2, wherein Further comprising: a reinforcing rib arranged on the outer wall of the flange.

4. The muffler of claim 1, wherein A convex rib is arranged on the path of the exhaust member to the exhaust hole.

5. An electric vacuum pump, characterized in that, The muffler is configured as claimed in any one of claims 1-4; wherein the air inlet of the muffler is in communication with the air outlet of the electric vacuum pump.

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