Air compressor silencer and automobile

Abstract

The application discloses an air compressor silencing device and a car, which can effectively reduce the noise generated by the air compressor when pumping, reduce the interference to the driver and the passenger, and improve the comfort of the vehicle. Moreover, the structure is compact, small in size, and small in occupation of the internal space of the car. The air compressor silencing device comprises a first shell and a second shell connected to the outer wall of the first shell, wherein the first shell is provided with a gas conveying chamber, the second shell is provided with a plurality of resonant cavities arranged in sequence, each resonant cavity is provided with a pipe body in communication with the gas conveying chamber, the pipe body is connected to the first shell, the lengths of at least two pipe bodies are different, and the volumes of at least two resonant cavities are different.

Description

Technical Field

[0001] This application relates to the field of automotive technology, and in particular to an air compressor silencer and an automobile. Background Technology

[0002] An engine air compressor is an air compression device installed on the engine block and driven by the engine crankshaft. When the air compressor is pumping air, the noise it generates is transmitted through the air compressor intake pipe to the vehicle's air intake pipe, and finally radiated out from the vehicle's high-mounted air intake, which can disturb the driver and passengers. Utility Model Content

[0003] To address the aforementioned issues, this application provides an air compressor silencing device and an automobile, which effectively reduces the noise generated by the air compressor and minimizes interference with the driver and passengers.

[0004] An embodiment of this application provides an air compressor silencing device comprising a first housing and a second housing, the second housing being connected to the outer wall of the first housing. The first housing has an air delivery chamber, and the second housing has a plurality of resonant cavities arranged in sequence. Each resonant cavity contains a tube communicating with the air delivery chamber. The tube is connected to the first housing. At least two of the tubes have different lengths, and at least two of the resonant cavities have different volumes.

[0005] The air compressor silencing device of this application adopts the Helmholtz resonant cavity principle, and the size parameters of the resonant cavity determine its natural frequency. When the noise frequency of the air compressor during air pumping is close to the natural frequency of the resonant cavity, the air vibration inside the cavity intensifies, which cancels out the noise generated by the air compressor, thereby achieving the purpose of noise reduction. The noise generated by the air compressor during air pumping is distributed in multiple frequency bands. In the above embodiment, multiple resonant cavities are set in the second housing, and the gas in the air delivery chamber can enter different resonant cavities through the pipe. At least two resonant cavities have different volumes, and at least two pipes have different lengths, which can achieve the effect of reducing noise in different frequency bands.

[0006] In one embodiment, the second housing has five of the resonant cavities.

[0007] In one embodiment, the tube is L-shaped, with one end connected to the outer wall of the first housing and the other end extending into the resonant cavity.

[0008] In one embodiment, the tube is cylindrical, with one end connected to the outer wall of the first housing and the other end extending into the resonant cavity.

[0009] In one embodiment, the tube is cylindrical, with one end extending into the gas delivery chamber and the other end extending into the resonant cavity.

[0010] In one embodiment, the resonant frequency f, the speed of sound c, the radius r of the tube, the volume V of the resonant cavity, and the total length L of the tube satisfy the following:

[0011] In one embodiment, the second housing is provided with a plurality of partitions, which are spaced apart to form a plurality of resonant cavities.

[0012] In one embodiment, the first housing has an air inlet and an air outlet that are opposite to each other.

[0013] This application also provides an automobile, which includes an air compressor, an engine, and the aforementioned air compressor muffler. The air compressor includes an air intake pipe, and the first housing has an air inlet and an air outlet, which are respectively connected to the air intake pipe. The engine includes an air intake pipe, and the air intake pipe communicates with the air intake pipe. Attached Figure Description

[0014] Figure 1 A schematic diagram of the structure of an air compressor silencer provided in one embodiment of this application;

[0015] Figure 2 A schematic diagram of the resonant cavity and tube structure provided for one embodiment of this application;

[0016] Figure 3 A schematic diagram of the resonant cavity and tube structure provided for another embodiment of this application;

[0017] Figure 4 This is a schematic diagram of the structure of a car provided in one embodiment of this application.

[0018] Figure label:

[0019] 1-First housing; 2-Second housing; 101-Gas delivery chamber; 201-Resonant cavity; 202-Pipe body; 203-Baffle; 21-First resonant cavity; 22-Second resonant cavity; 23-Third resonant cavity; 24-Fourth resonant cavity; 25-Fifth resonant cavity; 2021-First pipe body; 2022-Second pipe body; 102-Inlet; 103-Outlet;

[0020] 100 - Air compressor; 200 - Engine; 300 - Air compressor silencer; 10 - Air intake pipe; 20 - Air inlet pipe. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description of the application is provided in conjunction with the accompanying drawings and embodiments.

[0022] The terminology used in the following embodiments is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. As used in the specification and appended claims of this application, the singular expressions “a,” “an,” “the,” “the,” “the,” and “this” are intended to also include expressions such as “one or more” unless the context clearly indicates otherwise.

[0023] References to “an embodiment” or “a specific embodiment” as used in this specification mean that one or more embodiments of this application include a particular feature, structure, or characteristic described in connection with that embodiment. The terms “comprising,” “including,” “having,” and variations thereof mean “including, but not limited to,” unless otherwise specifically emphasized.

[0024] An engine air compressor is an air compression device mounted on the engine block and driven by the engine crankshaft. Through piston movement, it increases the air pressure from atmospheric pressure to a higher level. The air compressor is housed in an air tank. When the gas pressure in the air tank reaches a set level, the air compressor will unload and stop working to prevent the pressure in the air tank from becoming too high.

[0025] In related technologies, the air compressor is directly connected to the vehicle's air intake system via an air intake pipe. When the air compressor is pumping air, the noise it generates is transmitted through the air compressor's air intake pipe to the vehicle's air intake system, and finally radiated out from the vehicle's high-level air intake, which can be heard by the occupants of the vehicle, causing disturbance to the driver and passengers.

[0026] In view of this, embodiments of this application provide an air compressor silencing device and an automobile, which can effectively reduce the noise emitted by the air compressor when it is pumping air, and reduce interference to the driver and passengers.

[0027] Figure 1 A schematic diagram of the structure of an air compressor silencer provided in one embodiment of this application is shown below. Figure 1 As shown, an embodiment of this application provides an air compressor silencing device comprising a first housing 1 and a second housing 2, the second housing 2 being connected to the outer wall of the first housing 1. The first housing 1 has an air delivery chamber 101, and the second housing 2 has a plurality of sequentially arranged resonant cavities 201. Each resonant cavity 201 contains a pipe 202 communicating with the air delivery chamber 101, and the pipe 202 is fixedly connected to the first housing 1. At least two of the pipes 202 have different lengths, and at least two of the resonant cavities 201 have different volumes.

[0028] The aforementioned resonant cavity 201 is a Helmholtz resonant cavity, an acoustic structure that utilizes air vibration to generate a resonance effect. Its core principle can be compared to a mass-spring system. It consists of a neck (tube 202) and a sealed cavity (resonant cavity). The tube 202 acts as a vibrating mass, while the air inside the resonant cavity forms an air spring. When the incident sound wave frequency matches the natural resonant frequency, the air inside the tube 202 undergoes intense vibration and friction, efficiently converting sound energy into heat energy, which is then dissipated.

[0029] The air compressor silencing device of this application adopts the Helmholtz resonant cavity principle, and the size parameters of the resonant cavity 201 determine the natural frequency of the cavity. When the noise frequency of the air compressor during air pumping is close to the natural frequency of the resonant cavity 201, the air vibration inside the cavity intensifies, which cancels out the noise generated by the air compressor, thereby achieving the purpose of noise reduction. The noise generated by the air compressor during air pumping is distributed in multiple frequency bands. In the above embodiment, multiple resonant cavities 201 are provided in the second housing 2, and the gas in the air delivery chamber 101 can enter different resonant cavities 201 through the pipe 202. At least two resonant cavities 201 have different volumes, and at least two pipes 202 have different lengths, which can achieve the effect of reducing noise in different frequency bands.

[0030] In one embodiment, the second housing 2 is provided with a plurality of partitions 203, which are spaced apart to form a plurality of resonant cavities 201. In this embodiment, the plurality of partitions 203 are arranged parallel to each other. Two adjacent resonant cavities 201 are independent of each other. In other embodiments, the plurality of partitions 203 may not be arranged parallel to each other.

[0031] In one specific embodiment, the second housing 2 may have five resonant cavities 201, which are arranged sequentially, such as... Figure 1 As shown, the five resonant cavities are specifically the first resonant cavity 21, the second resonant cavity 22, the third resonant cavity 23, the fourth resonant cavity 24, and the fifth resonant cavity 25. The volume of each resonant cavity 201 can be different. In other embodiments, different numbers of resonant cavities 201, such as 3, 6, or 7, can be provided to reduce noise in various frequency bands and achieve better noise reduction effects.

[0032] The resonant cavity in this application is mainly used for noise reduction in the low and medium frequency ranges. The formula for the natural frequency of the resonant cavity is as follows:

[0033]

[0034] In the above formula, f is the resonant frequency, measured in Hertz (Hz). C is the speed of sound, measured in meters per second (m / s). r is the radius of tube 202, measured in meters (m). V is the volume of the resonant cavity, measured in cubic meters (m³). 3L represents the total length of tube 202, in meters (m).

[0035] As shown in the above formula, the longer the length L of the tube 202, the lower the resonant frequency f. The larger the volume V of the resonant cavity, the lower the resonant frequency f. The cross-section of the tube 202 can be circular, and the cross-section πr of the tube 202... 2 The smaller the value, the lower the resonant frequency f. The parameters of the air compressor's silencer can be adjusted using the above formula to reduce air compressor noise. Actual noise reduction effectiveness is subject to engineering verification.

[0036] The tube body 202 can take many forms. The shape and assembly form of the tube body 202 and the resonant cavity are described in detail below.

[0037] In one embodiment, the tube 202 can be L-shaped, such as... Figure 1 The tube 202 in the first resonant cavity 21 is shown. One end of the tube 202 is connected to the outer wall of the first housing 1, and the other end extends into the first resonant cavity 21. In this embodiment, the tube 202 is completely located in the resonant cavity 201. The tube 202 includes a first tube 2021 and a second tube 2022 connected to each other. The first tube 2021 and the second tube 2022 can be perpendicular to each other. The second tube 2022 is parallel to the axial direction of the first housing 1, and the first tube 2021 is perpendicular to the axial direction of the first housing 1. Air in the first housing 1 can enter the resonant cavity 201 through the tube 202.

[0038] Figure 2 This is a schematic diagram of the resonant cavity and tube structure provided in one embodiment of this application. In other embodiments, such as... Figure 2 As shown, the first tube 2021 and the second tube 2022 of the tube body 202 may not be perpendicular. The first tube 2021 and the second tube 2022 have an obtuse angle or an acute angle, which can be set as needed.

[0039] In another embodiment, the tube 202 can be cylindrical, with one end connected to the outer wall of the first housing 1 and the other end extending into the resonant cavity 201. Figure 1 The tube 202 is shown in the second resonant cavity 22, the third resonant cavity 23, and the fourth resonant cavity 24. In this embodiment, the tube 202 is completely located within the resonant cavity 201, and the tube 202 can be arranged perpendicular to the axial direction of the first housing 1. In other embodiments, the tube 202 may not be perpendicular to the axial direction of the first housing 1. It can be configured as needed.

[0040] In another embodiment, the tube 202 can be cylindrical, with one end extending into the gas delivery chamber 101 and the other end extending into the resonant cavity 201. For example... Figure 1The tube 202 in the fifth resonant cavity 25 shown. In this embodiment, a portion of the tube 202 is located in the resonant cavity 201, and another portion is located in the first housing 1. Since the volume of the fifth resonant cavity 25 is small, the tube 202 is correspondingly long. The resonant cavity 201 cannot accommodate the tube 202, so a portion of the tube 202 can extend into the first housing 1.

[0041] In other embodiments, the tube 202 described above may also be as follows: Figure 3 The arc-shaped tube shown can also be a spiral tube (not shown in the figure), etc. In addition to the shape of the tube 202 described in some of the above embodiments, the tube 202 can also be other shapes. This application does not limit the specific shape of the tube 202 and the resonant cavity 201.

[0042] In another embodiment, the first housing 1 can specifically be a tubular housing, having an air inlet 102 and an air outlet 103 that are opposite to each other. The air compressor silencer is installed on the air intake pipe of the air compressor, with the air inlet 102 and the air outlet respectively connected to the intake pipe. When the air compressor is pumping air, the gas enters the first housing 1 through the air inlet 102 and the air outlet 103, and then enters the resonant cavity 201 through multiple tubes 202. When installing the air compressor silencer, swapping the air inlet 102 and the air outlet 103 does not affect the noise reduction effect.

[0043] It is worth noting that, regardless of whether the tube 202 is partially or entirely located within the resonant cavity 201, the length of the tube 202 is its total length when calculating the parameter configurations for the resonant cavity 201 and the tube 202. The order of the first resonant cavity 21, the second resonant cavity 22, the third resonant cavity 23, the fourth resonant cavity 24, and the fifth resonant cavity 25 is not restricted and can be set as needed.

[0044] Figure 4 A schematic diagram of the structure of a car provided for one embodiment of this application, such as... Figure 4 As shown, this application also provides a vehicle, which includes an air compressor 100, an engine 200, and an air compressor muffler 300 as described in any of the above embodiments. The air compressor 100 includes an air intake pipe 10, and the engine 200 includes an intake pipe 20. The air intake pipe 10 is connected to the intake pipe 20. A first housing 1 has an air inlet 102 and an air outlet 103, which are respectively connected to the air intake pipe 10. The axis of the first housing 1 may coincide with the axis of the air intake pipe 10. The air compressor 100 draws air from the intake pipe 20 through the air intake pipe 10. The air compressor muffler of this application can efficiently reduce noise of different frequencies, improving vehicle comfort. Furthermore, it has a compact structure, small size, and occupies less interior space in the vehicle.

[0045] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A silencer for an air compressor, characterized in that, The device includes a first housing and a second housing, the second housing being connected to the outer wall of the first housing. The first housing has a gas delivery chamber, and the second housing has a plurality of resonant cavities arranged in sequence. Each resonant cavity contains a tube communicating with the gas delivery chamber. The tube is connected to the first housing. At least two of the tubes have different lengths, and at least two of the resonant cavities have different volumes.

2. The air compressor silencer according to claim 1, characterized in that, The second housing has five of the resonant cavities.

3. The air compressor silencer according to claim 1, characterized in that, The tube is L-shaped, with one end connected to the outer wall of the first housing and the other end extending into the resonant cavity.

4. The air compressor silencer according to claim 1, characterized in that, The tube is cylindrical, with one end connected to the outer wall of the first housing and the other end extending into the resonant cavity.

5. The air compressor silencer according to claim 1, characterized in that, The tube is cylindrical, with one end extending into the gas delivery chamber and the other end extending into the resonant cavity.

6. The air compressor silencer according to claim 1, characterized in that, The resonant frequency f, the speed of sound c, the radius r of the tube, the volume V of the resonant cavity, and the total length L of the tube satisfy the following:

7. The air compressor silencer according to claim 1, characterized in that, The second housing is provided with multiple partitions, which are spaced apart to form multiple resonant cavities.

8. The air compressor silencer according to claim 1, characterized in that, The first housing has an air inlet and an air outlet that are opposite to each other.

9. A car, characterized in that, The device includes an air compressor, an engine, and an air compressor silencer as described in any one of claims 1 to 8. The air compressor includes an air intake pipe, the first housing has an air inlet and an air outlet, the air inlet and the air outlet are respectively connected to the air intake pipe, and the engine includes an air intake pipe, with the air intake pipe communicating with the air intake pipe.

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