Noise control device, method and apparatus

Abstract

The application discloses a noise control device, method and equipment, relates to the technical field of noise control, and belongs to the technical field of noise control. The shell has a first chamber, a second chamber and a third chamber which are sequentially arranged and spaced apart; an air inlet port of the shell penetrates through the shell and is communicated with the first chamber, and an air outlet port of the shell penetrates through the shell and is communicated with the third chamber; the noise adjusting unit comprises a pipeline and a movable plate arranged in the second chamber, the pipeline penetrates through the movable plate, a plurality of perforations are arranged in the circumferential direction of the pipeline, one end of the pipeline is communicated with the first chamber, and the other end of the pipeline is communicated with the third chamber; a signal acquisition unit is arranged in the air outlet port and is used for acquiring a noise signal of gas output by the air outlet port; and a control unit drives the movable plate to move along the length direction of the shell based on the noise signal, so that the noise signal reaches a minimum value. According to the application, the position of the movable plate is adjusted based on the noise signal, so that the device can be adjusted according to different noise characteristic frequencies, and a better noise control effect is achieved.

Description

Technical Field

[0001] The present application belongs to the field of noise control technology, and specifically relates to a noise control device, method and equipment. Background Art

[0002] When a diesel engine is running, high levels of low, medium, and high-frequency noise are generated in the exhaust pipe due to factors such as cylinder firing and the high-speed operation of the turbocharger rotor. To control emission noise, mufflers are often installed in the exhaust pipe to reduce this noise level. However, the diesel exhaust mufflers currently on the market have a single structure and cannot be adjusted to the characteristic noise frequencies of different diesel engines, which in turn affects the final noise reduction effect. Summary of the Invention

[0003] In response to the above problems, the present application provides a noise control device, method and equipment, which can be adjusted according to different noise characteristic frequencies to achieve better noise control effects.

[0004] The present invention provides a noise control device comprising: a housing having a first chamber, a second chamber, and a third chamber arranged in sequence and spaced apart along a length direction of the housing; the housing having an air inlet port and an air outlet port, the air inlet port passing through the housing and communicating with the first chamber, and the air outlet port passing through the housing and communicating with the third chamber;

[0005] a noise adjustment unit disposed in the second chamber, the noise adjustment unit comprising a pipe and a movable plate, the outer periphery of the movable plate being slidably connected to the inner wall of the second chamber, the pipe passing through the movable plate and having a plurality of perforations arranged circumferentially therein, one end of the pipe being in communication with the first chamber, and the other end of the pipe being in communication with the third chamber;

[0006] A signal acquisition unit is provided in the gas outlet port, and is configured to acquire a noise signal of the gas output from the gas outlet port;

[0007] The control unit is electrically connected to the signal acquisition unit, and is configured to drive the movable plate to move along the length direction of the shell based on the noise signal, so as to minimize the noise signal.

[0008] In some embodiments, along the length direction of the shell, the pipeline includes multiple through pipes that are connected in sequence in the second chamber. Along the length direction of the shell, the multiple through pipes are evenly distributed in the circumference of the multiple through pipes, and the apertures of the perforations on the multiple through pipes decrease in sequence.

[0009] In some embodiments, along the length direction of the shell, the distance between the centers of two adjacent through-holes on the through-tube is 10 times the diameter of the through-hole.

[0010] In some embodiments, the lengths of the plurality of through tubes are equal along the length direction of the shell.

[0011] In some embodiments, along the width direction of the housing, the pipe has a first inner diameter L1, and the air inlet port has a second inner diameter L2, satisfying 0.6L2≥L1≥0.5L2.

[0012] In some embodiments, along the width direction of the housing, the first chamber has a third inner diameter L3, satisfying 3L2≥L3≥1.5L2.

[0013] In some embodiments, there are multiple pipes, each pipe passes through the movable plate, one end of each pipe is connected to the first chamber, and the other end of each pipe is connected to the third chamber.

[0014] In some embodiments, the housing further comprises:

[0015] a fourth chamber, disposed between the second chamber and the third chamber and in communication with the noise adjustment unit and the third chamber respectively;

[0016] The spark extinguishing collection unit is arranged in the fourth chamber. The spark extinguishing collection unit includes a spark extinguishing device and a collection device. One end of the spark extinguishing device is connected to the pipeline, and the other end of the spark extinguishing device is connected to the fourth chamber. The collection device is connected to the fourth chamber.

[0017] In some embodiments, the noise control device further comprises:

[0018] The resistive silencer unit is arranged in the third chamber.

[0019] In some embodiments, the housing further includes: a water outlet port, which passes through the housing and is in communication with the first chamber.

[0020] Accordingly, the present application also proposes a noise control method, which is applied to the noise control device in the above embodiment, and the method includes:

[0021] The control unit obtains the noise signal output by the signal acquisition unit when the movable plate is in different positions;

[0022] The control unit drives the movable plate to move along the length direction of the shell until it reaches a target position, which is the position of the movable plate corresponding to the minimum value of the noise signal.

[0023] In some embodiments, the method for determining the target location includes:

[0024] Obtaining the A-weighted total sound pressure level of the noise signal corresponding to each position of the movable panel within the first frequency range;

[0025] If there is only one movable panel location corresponding to the minimum value of the A-weighted total sound pressure level in the first frequency range, then that location is determined as the target location; if there are multiple movable panel locations corresponding to the minimum value of the A-weighted total sound pressure level in the first frequency range, then the A-weighted sound levels of multiple noise signals corresponding to the minimum value of the A-weighted total sound pressure level in the first frequency range in the second frequency range are obtained; wherein the maximum value in the first frequency range is greater than the maximum value in the second frequency range;

[0026] If there is only one movable panel position corresponding to the minimum value of the A-weighted total sound pressure level within the second frequency range, that position is determined as the target position; if there are multiple movable panel positions corresponding to the minimum value of the A-weighted total sound pressure level within the second frequency range, the position of the movable panel corresponding to any one of the minimum values ​​of the A-weighted total sound pressure level within the second frequency range is determined as the target position.

[0027] In some embodiments, the first frequency range is 20 Hz to 20 kHz;

[0028] The second frequency range is 20 Hz to 500 Hz.

[0029] Accordingly, the present application also proposes a noise control device, comprising:

[0030] at least one processor;

[0031] at least one memory for storing at least one program;

[0032] When at least one program is executed by at least one processor, the at least one processor implements the noise control method of any one of the above embodiments.

[0033] The beneficial effect of the present application is that the present application provides a noise control device, which includes: a shell, a noise adjustment unit, a signal acquisition unit, and a control unit. Along the length direction of the shell, the shell has a first chamber, a second chamber and a third chamber arranged in sequence and spaced apart; the shell has an air inlet port and an air outlet port, the air inlet port passes through the shell and is connected to the first chamber, and the air outlet port passes through the shell and is connected to the third chamber; the noise adjustment unit is arranged in the second chamber, the noise adjustment unit includes a pipe and a movable plate, the outer periphery of the movable plate is slidably connected to the inner wall of the second chamber, the pipe passes through the movable plate and a plurality of perforations are arranged circumferentially of the pipe, one end of the pipe is connected to the first chamber, and the other end of the pipe is connected to the third chamber; the signal acquisition unit is arranged in the air outlet port, and the signal acquisition unit is configured to collect the noise signal of the gas output from the air outlet port; the control unit is electrically connected to the signal acquisition unit, and the control unit is configured to drive the movable plate to move along the length direction of the shell based on the noise signal so that the noise signal reaches a minimum value. The present invention changes the noise signal of the gas output from the outlet port by driving the movable plate in the noise adjustment unit to move. Simultaneously, based on the noise signal of the gas output from the outlet port, the control unit can adjust the movable plate's movement position to minimize the noise signal of the gas output from the outlet port. In this way, the device can be adjusted according to different noise characteristic frequencies, achieving better noise control effects.

[0034] The present application also provides a noise control method, including the above-mentioned noise control device. Therefore, the noise control method can have all the technical features and beneficial effects of the above-mentioned noise control device, which will not be described in detail here.

[0035] The present application also provides a noise control device, including the above-mentioned noise control method. Therefore, the noise control device can have all the technical features and beneficial effects of the above-mentioned noise control method, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0037] Figure 1 A schematic structural diagram of a noise control device provided in an embodiment of the present application;

[0038] Figure 2 A schematic diagram of the front structure of a noise adjustment unit provided in an embodiment of the present application;

[0039] Figure 3A schematic top view of the noise adjustment unit provided in an embodiment of the present application;

[0040] Figure 4 A schematic diagram of the structure of the pipeline deployment provided in an embodiment of the present application;

[0041] Figure 5 for Figure 4 A partial enlarged schematic diagram of point A in the middle;

[0042] Figure 6 A schematic diagram of the cross-sectional structure of the resistive muffler unit provided in an embodiment of the present application along the width direction X;

[0043] Figure 7 for Figure 6 A partial enlarged schematic diagram of point B in the middle;

[0044] Figure 8 A logical flow diagram of the noise control method provided in an embodiment of the present application;

[0045] Figure 9 A schematic diagram of the noise control effect provided in an embodiment of the present application.

[0046] Explanation of the accompanying drawings: 10. Shell; 11. First chamber; 12. Second chamber; 13. Third chamber; 14. Air inlet port; 15. Air outlet port; 16. Fourth chamber; 17. Water outlet port; 20. Noise adjustment unit; 21. Pipe; 22. Movable plate; 211. Perforation; 212. Through pipe; 30. Signal acquisition unit; 40. Control unit; 50. Spark extinguishing and collecting unit; 51. Spark extinguishing device; 52. Collecting device; 60. Resistive silencer unit; 61. Perforated plate; 62. Alkali-free glass cloth; 63. Sound-absorbing material; 70-Insulation layer; 80-Support member. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0048] In the description of the present application, it should be understood that the specific embodiments described herein are only used to illustrate and explain the present application and are not used to limit the present application. The terms "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0049] It should also be noted that in the drawings of this application, arrows marked with X indicate the width direction, and arrows marked with Y indicate the length direction. In the description of this application, the length and width directions are introduced to more clearly define the structure and relative positional relationship of the various components in the noise control device. In actual implementation, the length and width directions intersect. Optionally, the length and width directions are perpendicular to each other to optimize the layout of the noise control device. In the description of this application, "perpendicular" means completely perpendicular at 90° or almost completely perpendicular. For example, an angle within the range of 80° to 100° is considered perpendicular.

[0050] This application provides a noise control device, method, and apparatus, each of which is described in detail below. It should be noted that the order in which the following embodiments are described does not limit the preferred order of the embodiments of this application. Furthermore, in the following embodiments, the descriptions of each embodiment have their own emphasis. For portions not described in detail in one embodiment, please refer to the relevant descriptions of other embodiments.

[0051] As the preamble to the embodiments of the present application, when the diesel engine is running, due to reasons such as cylinder ignition and high-speed operation of the supercharger rotor, the low, medium and high-frequency noise values ​​in its exhaust pipe are all very high. In order to control the emission noise, installing a silencer in the exhaust pipe has become a conventional solution. However, the diesel exhaust silencers currently on the market have a single structure and cannot be adjusted according to the characteristic frequencies of different diesel engines, especially for the low-frequency ignition frequency of medium-speed engines, the silencer effect is poor. In addition, the muffler design is inconsistent with the actual application environment, and the human body is relatively sensitive to low-frequency noise. If the low-frequency control frequency of the muffler deviates from the characteristic frequency such as the diesel engine ignition frequency, the silencer effect on the low-frequency characteristic frequency is reduced, which will significantly reduce the comfort of the personnel; and as the diesel engine runs for longer, its performance changes, the characteristics of the exhaust noise also change, and the low-frequency noise characteristics may also change accordingly. A silencer with a single structure cannot be adjusted according to different noise characteristic frequencies.

[0052] In view of this, the present application proposes a noise control device, aiming to solve at least one of the above technical problems.

[0053] See also Figure 1 As shown, Figure 1 Schematic diagram of the structure of a noise control device provided in an embodiment of the present application; A noise control device in an embodiment of the present application includes: a shell 10, along the length direction Y of the shell 10, the shell 10 has a first chamber 11, a second chamber 12 and a third chamber 13 arranged in sequence and spaced apart; the shell 10 has an air inlet port 14 and an air outlet port 15, the air inlet port 14 passes through the shell 10 and is connected to the first chamber 11, and the air outlet port 15 passes through the shell 10 and is connected to the third chamber 13; a noise adjustment unit 20 is provided in the second chamber 12, and the noise adjustment unit 20 includes a pipe 21 and a movable plate 22 The outer periphery of the movable plate 22 is slidably connected to the inner wall of the second chamber 12, the pipe 21 passes through the movable plate 22 and the pipe 21 is circumferentially provided with a plurality of perforations 211, one end of the pipe 21 is connected to the first chamber 11, and the other end of the pipe 21 is connected to the third chamber 13; the signal acquisition unit 30 is arranged in the gas outlet port 15, and the signal acquisition unit 30 is configured to collect the noise signal of the gas output from the gas outlet port 15; the control unit 40 is electrically connected to the signal acquisition unit 30, and the control unit 40 is configured to drive the movable plate 22 to move along the length direction Y of the shell 10 based on the noise signal so that the noise signal reaches a minimum value.

[0054] It should be understood that the first chamber 11, the second chamber 12 and the third chamber 13 in the shell 10 refer to the air inlet port 14 to the air outlet port 15, that is, they are arranged in sequence along the length direction Y of the shell 10; a partition is provided between the first chamber 11 and the second chamber 12, and between the second chamber 12 and the third chamber 13, which is connected to the inner wall of the shell 10, thereby separating the shell 10 into the first chamber 11, the second chamber 12 and the third chamber 13; the air inlet port 14 is used to input the exhaust gas, and the exhaust gas passes through the first chamber 11, the second chamber 12 and the third chamber 13 in sequence and is discharged through the air outlet port 15, and the air outlet port 15 is used to output the gas after noise elimination by the noise control device.

[0055] Among them, the noise adjustment unit 20 is arranged in the second chamber 12, and the second chamber 12 provides a resonance cavity for the noise adjustment unit 20. The outer periphery of the movable plate 22 is slidably connected to the inner wall of the second chamber 12 so that the movable plate 22 can move in the second chamber 12 along the length direction Y of the shell 10 to change the volume of the resonance cavity on both sides of the movable plate 22, thereby adjusting the sound absorption frequency range of the resonance cavity; the pipe 21 passes through the movable plate 22 and contacts the movable plate 22, so that when the movable plate 22 moves along the length direction Y of the shell 10, it also moves along the extension direction of the pipe 21. One end of the pipe 21 is connected to the first chamber 11, and the other end of the pipe 21 is connected to the third chamber 13. Then, one end of the pipe 21 passes through the partition between the first chamber 11 and the second chamber 12 and is connected to the first chamber 1 1, the other end of the pipe 21 passes through the partition between the second chamber 12 and the third chamber 13 and is connected to the third chamber 13, so that the gas discharged from the air inlet port 14 can pass through the first chamber 11, the second chamber 12 and the third chamber 13 in sequence and be discharged through the air outlet port 15. The partitions between the first chamber 11 and the second chamber 12 and between the second chamber 12 and the third chamber 13 are connected to the pipe 21 to fix the position of the pipe 21; the pipe 21 is partially circumferentially provided with a plurality of through-holes 211 in the area within the second chamber, wherein the through-holes 211 pass through the pipe 21 and connect the inside and outside of the pipe 21. When the movable plate 22 moves along the length direction Y of the shell 10, it not only adjusts the volume of the resonance cavity but also adjusts the number of the through-holes 211, thereby adjusting the sound-absorbing frequency range of the resonance cavity.

[0056] The signal acquisition unit 30 can be, but is not limited to, a high-temperature-resistant acoustic microphone array, acoustic sensor, vibration sensor, or the like. The signal acquisition unit 30 is disposed within and connected to the outlet port 15 , thereby securing the signal acquisition unit 30 to the outlet port 15 to collect noise signals from the output gas. It should be noted that the signal acquisition unit must be resistant to temperatures exceeding 300°C to be suitable for use in high-temperature exhaust scenarios.

[0057] The control unit 40 may be, but is not limited to, a computer or an embedded system. The control unit 40 is electrically connected to the signal acquisition unit 30 to acquire the noise signal output by the signal acquisition unit, and then, based on the acquired noise signal, drives the movable plate 22 to move along the longitudinal direction Y of the housing 10 so that the noise signal corresponding to the position of the movable plate 22 after movement reaches a minimum value. It should be noted that the noise signal corresponding to the position of the movable plate 22 after movement reaches a minimum value refers to the noise signal reaching a minimum value compared to the noise signal at each position that the movable plate 22 can reach. The control unit 40 may drive the movable plate 22 to move along the longitudinal direction Y of the housing 10 via a drive motor, and the drive motor may move the movable plate 22 via a transmission mechanism such as, but not limited to, a lead screw.

[0058] Through the above technical solution, the present application adjusts the silencing frequency range of the resonant cavity by driving the movable plate in the noise adjustment unit to move, thereby changing the noise signal of the gas output from the outlet port. At the same time, based on the noise signal of the gas output from the outlet port, the control unit can adjust the movement position of the movable plate to minimize the noise signal of the gas output from the outlet port. In this way, the device can be adjusted according to different noise characteristic frequencies to achieve better noise control effects.

[0059] See also Figures 1 to 5 As shown, Figure 1 A schematic structural diagram of a noise control device provided in an embodiment of the present application; Figure 2 A schematic diagram of the front structure of a noise adjustment unit provided in an embodiment of the present application; Figure 3 A schematic top view of the noise adjustment unit provided in an embodiment of the present application; Figure 4 A schematic diagram of the structure of the pipeline deployment provided in an embodiment of the present application; Figure 5 for Figure 4 A local enlarged schematic diagram of point A in the middle.

[0060] In some embodiments, along the length direction Y of the shell 10, the pipeline 21 includes a plurality of through pipes 212 connected in sequence, and along the length direction Y of the shell 10, the plurality of through pipes 212 are evenly distributed with through holes 211 in the circumferential direction, and the apertures of the through holes 211 on the plurality of through pipes 212 decrease in sequence.

[0061] It should be understood that multiple through tubes 212 are all arranged in the second chamber 12, and multiple through tubes 212 can be integrally formed to form the regional part of the pipeline 21 in the second chamber 12, that is, the pipeline 21 is provided with perforations 211 on the tube wall in the second chamber 12; the gas discharged from the air inlet port 14 passes through the first chamber 11 and the pipeline 21 into the second chamber 12, and then enters the third chamber 13 through the pipeline 21 and is discharged through the air outlet port 15; the apertures of the perforations 211 on the multiple through tubes 212 decrease successively, that is, the apertures of the perforations 211 on each through tube 212 are the same, and the apertures of the perforations 211 of the multiple through tubes 212 are inconsistent. The apertures of the perforations 211 of the multiple through tubes 212 from the first chamber 11 to the third chamber 13 decrease successively, and the apertures of the perforations 211 on the through tubes 212 close to the first chamber 11 are the largest, and the apertures of the perforations 211 on the through tubes 212 close to the third chamber 13 are the smallest.

[0062] In some embodiments, the pipeline 21 includes three through pipes 212 connected in sequence, and the apertures of the perforations 211 on the three through pipes 212 decrease in sequence to cover a larger frequency range. The apertures on the three through pipes 212 correspond to Class A aperture, Class B aperture, and Class C aperture from the first chamber 11 to the third chamber 13; the Class A aperture is 8mm-10mm, corresponding to a frequency of 40Hz-50Hz; the Class B aperture is 4mm-6mm, corresponding to a frequency of 50Hz-60Hz, and the Class C aperture is 0.8mm-1.2mm, corresponding to a frequency of 60Hz-70Hz.

[0063] Through the above technical solution, the movable plate 22 moves along the length direction Y of the housing 10 to adjust the volume of the resonant cavity, the number of perforations 211, and the aperture size of the perforations 211. As the movable plate 22 moves from the first chamber 11 toward the second chamber 12, the volume of the resonant cavity gradually decreases, the number of perforations 211 gradually decreases, and the aperture size of the perforations 211 gradually decreases, thereby adjusting the frequency range of the resonant cavity's sound attenuation. As the movable plate 22 moves from the first chamber 11 toward the second chamber 12, the volume of the resonant cavity on both sides of the movable plate 22 changes, and the perforation ratio and resonant cavity volume of the resonant muffler change, thereby changing the central sound attenuation frequency of the resonant muffler.

[0064] In some embodiments, along the length direction Y of the housing 10 , the distance between the centers of two adjacent through-holes 211 on the through-tube 212 is 10 times the diameter of the through-hole 211 .

[0065] It should be understood that, along the length direction Y of the shell 10, multiple layers of perforations 211 are arranged on the circumference of each through tube 212, and the apertures of the perforations 211 on each through tube 212 are consistent. Then, along the length direction Y of the shell 10, the distance between the centers of two adjacent perforations 211 on each through tube 212 is 10 times the diameter of the perforation 211 on the corresponding through tube 212; in addition, on the circumference of each through tube 212, that is, the circumferential direction of the through tube 212, the distance between the centers of two adjacent perforations 211 on each through tube 212 in the circumferential direction is also 10 times the diameter of the perforation 211 on the corresponding through tube 212; the relationship between the hole pitch and the aperture determines the perforation rate of the pipe 21, and the perforation rate is an important parameter that determines the sound attenuation amount and center frequency of the resonant silencer cavity. Another important parameter is the resonant cavity volume. The variable parameter used by the present invention to adjust the frequency of the resonant silencer is the resonant cavity volume, so the perforation rate needs to be fixed. Such a layout can increase the resonance effect.

[0066] In some embodiments, the plurality of through-tubes 212 have the same length along the length direction Y of the housing 10. In some embodiments, the conduit 21 includes three through-tubes 212 that are sequentially connected, and the lengths of the three through-tubes 212 along the length direction Y of the housing 10 are the same, i.e., the length of each through-tube 212 is 1 / 3 of the length of the perforated tube of the conduit 21 in the second chamber 12.

[0067] In some embodiments, along the width direction X of the housing 10, the duct 21 has a first inner diameter L1, and the air inlet port 14 has a second inner diameter L2, satisfying 0.6L2 ≥ L1 ≥ 0.5L2. It should be understood that by satisfying the condition of 0.6L2 ≥ L1 ≥ 0.5L2, noise propagation can be reduced, airflow dynamics can be optimized, and the noise frequency range can be controlled. A smaller duct inner diameter can improve sound absorption performance and reduce noise levels compared to a larger air inlet port inner diameter.

[0068] In some embodiments, along the width direction X of the housing 10, the first chamber 11 has a third inner diameter L3, satisfying 3L2 ≥ L3 ≥ 1.5L2. It should be understood that by satisfying the condition of 3L2 ≥ L3 ≥ 1.5L2, the larger third inner diameter L3 relative to the inner diameter L2 of the air inlet port 14 can achieve a greater expansion ratio, resulting in a greater impedance change, generating reflection and interference of acoustic energy, thereby reducing the acoustic energy radiated outward by the muffler, improving the muffler effect at low and medium frequencies, and simultaneously improving high-frequency failure phenomena, thereby increasing the upper limit failure frequency of the muffler.

[0069] In some embodiments, there are multiple pipes 21, each of which passes through the movable plate 22. One end of each pipe 21 is connected to the first chamber 11, and the other end of each pipe 21 is connected to the third chamber 13. It should be understood that this arrangement of multiple pipes 21 can improve the sound-absorbing performance of the resonance cavity and reduce the noise level.

[0070] In some embodiments, there are four pipes 21; the four pipes can be evenly arranged in the second chamber. For example, when the radial cross-section of the second chamber is a circle, the centers of the radial cross-sections of the four pipes can be located on a circle with the center of the radial cross-section of the second chamber as the center, and the four pipes are evenly distributed on the circumference, and four resonant perforated tubes are connected in parallel to increase the amount of attenuation.

[0071] In some embodiments, the shell 10 also includes: a fourth chamber 16, which is arranged between the second chamber 12 and the third chamber 13 and is respectively connected to the noise adjustment unit 20 and the third chamber 13; a spark extinguishing collection unit 50, which is arranged in the fourth chamber 16, and the spark extinguishing collection unit 50 includes a spark extinguishing device 51 and a collection device 52, one end of the spark extinguishing device 51 is connected to the pipeline 21, and the other end of the spark extinguishing device 51 is connected to the fourth chamber 16, and the collection device 52 is connected to the fourth chamber 16.

[0072] It should be understood that in order to avoid the impact of directly discharging gas containing sparks on the environment, a spark extinguishing collection unit 50 is provided between the second chamber 12 and the third chamber 13 through the fourth chamber 16. The sparks in the gas are extinguished by the spark extinguishing device 51, and the extinguished ash is discharged into the fourth chamber 16. The smoke dust after the sparks are extinguished is separated into the collection device 52 by the centrifugal principle. In some embodiments, the spark extinguishing device 51 can achieve the purpose of extinguishing sparks through the collision principle, and the collection device 52 can collect the smoke dust through a dust collection tube. When the smoke dust reaches a certain amount, the flange cover of the dust collection tube can be opened for cleaning. It should be noted that one end of the pipe 21 passes through the partition between the first chamber 11 and the second chamber 12 and is connected to the first chamber 11, and the other end of the pipe 21 passes through the partition between the second chamber 12 and the fourth chamber 16 and is connected to the fourth chamber 16.

[0073] See also Figure 6 and Figure 7As shown, in some embodiments, the noise control device further includes: a resistive silencer unit 60, which is arranged in the third chamber 13. It should be understood that the resistive silencer unit 60 uses the principle of resistive silencer to set a certain area of ​​sound-absorbing material 63. When the sound wave is incident on the sound-absorbing material 63, friction energy is consumed inside the porous sound-absorbing material, thereby achieving the purpose of silencer. The resistive silencer unit 60 is mainly used to eliminate the medium and high frequency noise in the exhaust noise of the diesel engine, and is combined with the noise adjustment unit 20 to eliminate the low frequency noise, so that the noise control device can achieve full-band silencer function. It should be noted that the sound-absorbing material 63 can be high-temperature resistant rock wool, the sound-absorbing material 63 can be tightly attached to the inner wall of the shell 10, or it can be annular or sheet-shaped. The present application does not limit the position of the sound-absorbing material 63 in the resistive silencer unit 60 in the third chamber 13. In addition. In order to prevent the rock wool from escaping, alkali-free glass cloth 62 and a perforated plate 61 are used to fix the sound-absorbing material 63 on the side of the sound-absorbing material 63 away from the shell 10; in addition, in the circular sound-absorbing structure, the sound-absorbing material 63 in the middle of the ring constitutes a silencer column, which can be supported by a support member 80. The support member can be used but is not limited to a support column, a support plate, etc.

[0074] See also Figure 1 As shown, in some embodiments, the shell 10 further includes: a water outlet port 17, which passes through the shell 10 and is in communication with the first chamber 11. It should be understood that when the high-temperature exhaust gas flow encounters the muffler at room temperature during startup, a small amount of condensed water will be generated. Therefore, the water outlet port 17 is provided and is in communication with the first chamber 11 to reach a condensed water outlet section to lead out the condensed water, thereby preventing the condensed water from damaging the performance of the exhaust muffler and accelerating the corrosion of the exhaust muffler. It should be noted that an insulation layer 70 is provided on the outside of the shell 10. Since the temperature of the exhaust pipe may reach more than 300 degrees or even more than 400 degrees, which is easy to cause burns, it is necessary to cover the exhaust pipe and the equipment on the exhaust pipe with an insulation layer 70 on the outermost side so that the temperature of the outer surface of the insulation layer 70 is not higher than 60 degrees to avoid burns.

[0075] Correspondingly, in some embodiments, the present application also proposes a noise control method, which is applied to the noise control device in the above embodiments, and the method includes: obtaining, through the control unit 40, the noise signal output by the signal acquisition unit 30 when the movable plate 22 is in different positions; and driving, through the control unit 40, the movable plate 22 to move along the length direction Y of the shell 10 until it reaches the target position, and the target position is the position of the movable plate 22 corresponding to the minimum value of the noise signal.

[0076] It can be understood that the noise control method is applied to the above-mentioned noise control device, so the noise control method can have all the technical features and beneficial effects of the above-mentioned noise control device, which will not be repeated here.

[0077] In some embodiments, the method for determining the target position includes: obtaining the A-weighted total sound pressure level of the noise signal corresponding to each position of the movable panel 22 within a first frequency range;

[0078] If the number of locations of the movable panel 22 corresponding to the minimum value of the A-weighted total sound pressure level in the first frequency range is one, then that location is determined as the target location; if the number of locations of the movable panel 22 corresponding to the minimum value of the A-weighted total sound pressure level in the first frequency range is multiple, then the A-weighted sound levels of multiple noise signals corresponding to the minimum value of the A-weighted total sound pressure level in the first frequency range in the second frequency range are obtained; wherein the maximum value in the first frequency range is greater than the maximum value in the second frequency range;

[0079] If there is only one position of the movable panel 22 corresponding to the minimum value of the A-weighted total sound pressure level within the second frequency range, then that position is determined as the target position; if there are multiple positions of the movable panel 22 corresponding to the minimum value of the A-weighted total sound pressure level within the second frequency range, then the position of the movable panel 22 corresponding to any one of the minimum values ​​of the A-weighted total sound pressure level within the second frequency range is determined as the target position.

[0080] It should be understood that the A-weighted total sound pressure level is a parameter used for audio measurement. For example, the A-weighted total sound pressure level in the first frequency range refers to the original sound pressure level corresponding to each frequency point in the first frequency range. The A-weighted sound pressure level corresponding to each frequency point is obtained by using the A-weighted curve. Then, the A-weighted sound pressure level at each frequency point is energy-summed to obtain the A-weighted total sound pressure level in the first frequency range. In the method for determining the target position, the position of the movable plate 22 corresponding to the minimum value of the A-weighted total sound pressure level in the first frequency range is first preliminarily screened using a larger frequency range. This can cover a wider range of sound pressure signals, thereby more comprehensively evaluating the noise performance of the movable plate 22 at different positions, and can quickly narrow the range of the target position, laying the foundation for subsequent accurate determination of the target position. Then, the position of the movable plate 22 corresponding to the minimum value of the A-weighted total sound pressure level in the second frequency range is determined using a smaller frequency range. This can more accurately evaluate the noise performance of the movable plate 22 at a specific position, thereby determining the target position to which the control unit 40 drives the movable plate 22 to move along the longitudinal direction Y of the housing 10 so that the noise signal of the gas output from the outlet port reaches a minimum value. It should be noted that, since the noise signal corresponding to each position of the movable plate 22 needs to be obtained after the movable plate 22 traverses all positions within the movable range, if there are multiple positions of the movable plate 22 corresponding to the minimum value of the A-weighted total sound pressure level in the second frequency range, the position closest to the position of the movable plate 22 after traversing all positions can be selected as the target position, which can reduce the number of movements of the movable plate 22, thereby saving time and energy, improving efficiency, and helping to improve the response speed of the system so that it can adapt to changes in noise signals more quickly. In addition, reducing the number of movements of the movable plate 22 can reduce the friction and wear between it and the shell 10, which helps to extend the service life of the movable plate 22 and reduce the cost of maintenance and replacement.

[0081] In some embodiments, the first frequency range is 20Hz to 20kHz; the second frequency range is 20Hz to 500Hz. It should be understood that the range of 20Hz to 20kHz covers most frequencies within the human hearing range, and the range of 20Hz to 500Hz mainly covers low-frequency to mid-low-frequency sounds. In this application, the resistive muffler unit 60 can eliminate the mid- and high-frequency noise in the exhaust noise, and then the noise signal output by the final signal acquisition unit 30 is mostly low-frequency noise. Then, the range of 20Hz to 20kHz covers the undisturbed noise signal output by the noise control device, so that determining the target position can achieve a better noise control effect.

[0082] In addition, it can be understood that the noise control method is applied to the above-mentioned noise control device, so the noise control method can also have all the technical features and beneficial effects of the above-mentioned noise control device, which will not be repeated here.

[0083] For example, see Figure 8 As shown, Figure 8 A logical flow diagram of the noise control method provided in an embodiment of the present application.

[0084] First, turn on the control unit 40. The control unit 40 will first self-check to see if it is normal, such as whether the sensor data is transmitted normally, whether the power supply to the drive end is normal, whether the driver is executing normally, whether the limiter receives the signal, etc. If a fault occurs, the fault light will be turned on, the motor will be locked, and the power supply to the drive motor will be turned off. If the self-check is normal, the control unit 40 will start to execute the control program: if the memory has previous data stored, the green light can be turned on as an indicator, and the function of reading the stored data can be directly selected. At this time, the noise control device will be restored to the last working state; if there are no stored parameters, the yellow light can be turned on as an indicator, or if the parameters need to be readjusted, press the reset button to start the adaptive adjustment program. The control unit 40 may include a data acquisition and analysis system and a controller. By turning on the controller, the controller self-checks to see if it is normal.

[0085] Then, if the reset button is pressed, the drive motor moves the movable plate 22 to zero, i.e., the bottom dead center. The bottom dead center can be set automatically by the control program. The signal acquisition unit 30 then begins to operate, collecting and recording noise data. The collected data is converted into the total sound pressure level (A-weighted) within 20-20kHz with an accuracy of 0.1dB. The bottom dead center is the position within the second chamber 12 where the movable plate 22 is closest to the first chamber 11.

[0086] Next, the drive motor moves the movable plate 22 via the drive shaft, beginning at a speed of 50 mm per step toward its top dead center. With each step, the signal acquisition unit 30 collects data for 10 seconds and saves it to the control unit 40. Once the movable plate 22 reaches its top dead center, the drive motor stops and awaits instructions from the control unit 40. At this point, the data acquisition and analysis system in the control unit 40 compares and analyzes the multiple sets of data, selecting the location with the lowest total sound pressure level as the target location. If there are points with the same total sound pressure level, the total 20-500 Hz sound pressure level values ​​of the noise data at the same points are compared, and the location with the lowest noise level is selected as the target location. If there are still points with the same total sound pressure level, the point of the movable plate 22 closest to the top dead center is selected as the target location. After determining the final position, the parameters are saved. Finally, the control unit 40 issues a command to the drive motor to move the movable plate 22 to the target position, then locks the motor and turns off the power to the drive motor. The control process is complete. The top dead center is the position within the second chamber 12 where the movable plate 22 is closest to the fourth chamber 16.

[0087] See also Figure 9 As shown, Figure 9 Schematic diagram of the control effect of the noise control device provided in the embodiment of the present application. The figure shows the noise spectrum data collected by the signal collector before and after the noise control device is turned on. It can be seen from the figure that after the adaptive noise control system is installed, that is, after the noise control device is installed, the exhaust noise is well controlled in all frequency bands, and the noise reduction effect is significant. After the adaptive control system is automatically adjusted, that is, after the noise control device is turned on, the low-frequency noise of the exhaust is further reduced by automatically adjusting the movable plate, wherein the noise reduction at 31.5Hz increases from 5.5dB(A) to 8.8dB(A), the noise reduction at 63Hz increases from 12.8dB(A) to 15.7dB(A), and the noise reduction at 125Hz increases from 19.8dB(A) to 21.7dB(A). Therefore, the noise control device can achieve a good noise reduction effect in the design stage, and at the same time, in the application stage, through the adaptive algorithm and automatic actuator, the noise reduction effect is optimized, especially the adjustment of the low-frequency noise reduction effect. The system has a wide range of applications and many application scenarios, and can provide an effective means for controlling exhaust noise.

[0088] The embodiments of the present application provide a noise control device, method and equipment, which adjusts the sound-absorbing frequency range of the resonance cavity by adjusting the volume of the resonance cavity and the number and size of the perforations. After installation, the exhaust spectrum characteristics are analyzed based on the measured exhaust noise to obtain the optimal position of the movable plate. The controller drives the motor to adjust the resonance cavity, thereby fine-tuning the low-frequency noise reduction frequency of the sound-absorbing system, so that its sound-absorbing characteristics are fully adapted to the actual use environment and the best sound-absorbing effect is achieved. It can simultaneously absorb different frequency bands of exhaust noise, and can be designed for the unique ignition frequencies of different diesel engines, so as to provide a silencer with an enhanced effect on low frequencies.

[0089] Accordingly, in some embodiments, embodiments of the present application further provide a noise control device comprising: at least one processor; at least one memory for storing at least one program; when the at least one program is executed by the at least one processor, the at least one processor implements the noise control method of the above-described embodiment. It is understood that since the noise control device includes the above-described noise control method, the noise control device can have all the technical features and beneficial effects of the above-described noise control method, and further description thereof will not be given here.

[0090] The above is a detailed introduction to a noise control device, method and equipment provided by the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core ideas of the present application. At the same time, for those skilled in the art, based on the ideas of the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present application.

Claims

1. A noise control device, characterized in that: include: A housing (10), wherein along a length direction (Y) of the housing (10), the housing (10) has a first chamber (11), a second chamber (12), and a third chamber (13) arranged in sequence and spaced apart; the housing (10) has an air inlet port (14) and an air outlet port (15), the air inlet port (14) passing through the housing (10) and communicating with the first chamber (11), and the air outlet port (15) passing through the housing (10) and communicating with the third chamber (13); A noise adjustment unit (20) is provided in the second chamber (12), the noise adjustment unit (20) comprises a pipe (21) and a movable plate (22), the outer periphery of the movable plate (22) is slidably connected to the inner wall of the second chamber (12), the pipe (21) passes through the movable plate (22) and the pipe (21) is circumferentially provided with a plurality of perforations (211), one end of the pipe (21) is in communication with the first chamber (11), and the other end of the pipe (21) is in communication with the third chamber (13); A signal acquisition unit (30) is provided in the gas outlet port (15), and the signal acquisition unit (30) is configured to acquire a noise signal of the gas output from the gas outlet port (15); A control unit (40) is electrically connected to the signal acquisition unit (30), and the control unit (40) is configured to drive the movable plate (22) to move along the length direction (Y) of the shell (10) based on the noise signal, so as to minimize the noise signal.

2. The noise control device according to claim 1, characterized in that Along the length direction (Y) of the shell (10), the pipeline (21) includes a plurality of through pipes (212) arranged in the second chamber (12) and connected in sequence. Along the length direction (Y) of the shell (10), the plurality of through pipes (212) are evenly distributed with the through holes (211) in the circumferential direction, and the apertures of the through holes (211) on the plurality of through pipes (212) decrease in sequence.

3. The noise control device according to claim 2, characterized in that: Along the length direction (Y) of the shell (10), the distance between the centers of two adjacent through holes (211) on the through pipe (212) is 10 times the diameter of the through hole (211).

4. The noise control device according to claim 2, characterized in that: Along the length direction (Y) of the shell (10), the lengths of the plurality of through pipes (212) are equal.

5. The noise control device according to claim 1, characterized in that: Along the width direction (X) of the housing (10), the pipe (21) has a first inner diameter L1, and the air inlet port (14) has a second inner diameter L2, satisfying 0.6L2≥L1≥0.5L2.

6. The noise control device according to claim 5, characterized in that: Along the width direction (X) of the housing (10), the first chamber (11) has a third inner diameter L3, satisfying 3L2≥L3≥1.5L2.

7. The noise control device according to claim 1, characterized in that: There are multiple pipes (21), each of which passes through the movable plate (22), one end of each of which is connected to the first chamber (11), and the other end of each of which is connected to the third chamber (13).

8. The noise control device according to claim 1, characterized in that: The housing (10) further comprises: a fourth chamber (16) disposed between the second chamber (12) and the third chamber (13) and communicating with the noise adjustment unit (20) and the third chamber (13) respectively; A spark extinguishing collection unit (50) is provided in the fourth chamber (16), comprising a spark extinguishing device (51) and a collection device (52), one end of the spark extinguishing device (51) being in communication with the pipe (21), the other end of the spark extinguishing device (51) being in communication with the fourth chamber (16), and the collection device (52) being in communication with the fourth chamber (16).

9. The noise control device according to claim 1, characterized in that: Also includes: The resistive muffler unit (60) is arranged in the third chamber (13).

10. The noise control device according to claim 1, characterized in that The housing (10) further comprises a water outlet port (17) which passes through the housing (10) and is in communication with the first chamber (11).

11. A noise control method, characterized in that: Applied to the noise control device according to any one of claims 1 to 10, the method comprising: Acquiring, by means of a control unit (40), noise signals output by a signal acquisition unit (30) when the movable plate (22) is at different positions; The control unit (40) drives the movable plate (22) to move along the length direction (Y) of the housing (10) until it reaches a target position, wherein the target position is the position of the movable plate (22) corresponding to the minimum value of the noise signal.

12. The noise control method according to claim 11, characterized in that: The method for determining the target position includes: Obtaining the A-weighted total sound pressure level of the noise signal corresponding to each position of the movable plate (22) within a first frequency range; If the number of locations of the movable plate (22) corresponding to the minimum value of the A-weighted total sound pressure level in the first frequency range is one, then the location is determined as the target location; if the number of locations of the movable plate (22) corresponding to the minimum value of the A-weighted total sound pressure level in the first frequency range is multiple, then the A-weighted sound levels of multiple noise signals corresponding to the minimum value of the A-weighted total sound pressure level in the first frequency range in the second frequency range are obtained; wherein the maximum value in the first frequency range is greater than the maximum value in the second frequency range; If the number of positions of the movable plate (22) corresponding to the minimum value of the A-weighted total sound pressure level within the second frequency range is one, then this position is determined as the target position; if the number of positions of the movable plate (22) corresponding to the minimum value of the A-weighted total sound pressure level within the second frequency range is multiple, then the position of the movable plate (22) corresponding to any one of the minimum values ​​of the A-weighted total sound pressure level within the second frequency range is determined as the target position.

13. The noise control method according to claim 12, characterized in that: The first frequency range is 20 Hz to 20 kHz; The second frequency range is 20 Hz to 500 Hz.

14. A noise control device, characterized in that: include: at least one processor; at least one memory for storing at least one program; When the at least one program is executed by the at least one processor, the at least one processor implements the noise control method according to any one of claims 11 to 13.

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