Air suspension air supply unit noise reduction device and noise reduction method thereof

Abstract

The invention provides an air suspension air supply unit noise reduction device and a noise reduction method thereof. The noise reduction device comprises an air inlet connector, an air outlet connector and an air conveying pipeline, and the air inlet connector communicates with the air pump end of an air supply unit; the air outlet joint is communicated with a distribution valve end of the air supply unit; the gas conveying pipeline is communicated between the gas inlet joint and the gas outlet joint; wherein at least one bend is arranged in a gas path formed by the gas inlet connector, the gas outlet connector and the gas conveying pipeline. According to the invention, the pulse airflow is separated through the two-channel gas conveying pipeline, so that the single pulse airflow energy is divided into two parts, and the bending part arranged in the gas path is matched to weaken the energy of the pulse airflow and reduce the single pulse airflow energy, so that the problem of high-frequency noise caused by shock excitation of some parts when the pulse airflow passes through is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of air suspension, and in particular to a noise reduction device for an air suspension air supply unit and a noise reduction method thereof. Background Art

[0002] In modern chassis technology, air suspension has been gradually applied to design and development by major OEMs due to its superior comfort. And with the continuous development of air suspension, the air suspension that was originally only configured as a high-end car has a sinking trend and has been widely used by many OEMs in a variety of models. The air supply unit, hereinafter referred to as ASU (Air Supply Unit), as the source of gas in the air suspension, plays a vital role in the entire system. There are also many factors to consider in the design of ASU. During its development and design process, high-frequency noise caused by airflow pulses occurs. This high-frequency noise has a low sound pressure level, and the decibel value measured by noise testing equipment is very low, but during the ride, it will have a significant impact on people's hearing and is very harsh. Therefore, it is particularly important to eliminate this high-frequency noise and improve customer experience.

[0003] When the air pump is working, the compressor compresses and pressurizes the inhaled gas and presses it into the gas tank or air spring. The pressure valve at the end of the pump body needs to form a fixed pressure difference on both sides of the valve body before it can be opened. Therefore, the air flow output by the air pump to the rear end is delivered in the form of pulses. The pulses pass through the entire air supply system, causing vibration of certain components in the system, and then generating high-frequency noise similar to electromagnetic current.

[0004] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present invention and does not constitute any limitation to the present invention. Summary of the invention

[0005] In view of the shortcomings of the prior art mentioned above, the present invention provides an air suspension air supply unit noise reduction device and a noise reduction method thereof, which separates the pulse airflow through a dual-channel air supply pipeline, so that the energy of a single pulse airflow is divided into two parts, thereby reducing the energy of a single pulse airflow, so as to solve the problem of high-frequency noise caused by the excitation of certain components when the pulse airflow passes through.

[0006] The present invention provides a noise reduction device for an air suspension air supply unit, comprising an air inlet joint, an air outlet joint and an air supply pipeline, wherein the air inlet joint is connected to an air pump end of the air supply unit; the air outlet joint is connected to a distribution valve end of the air supply unit; the air supply pipeline is connected between the air inlet joint and the air outlet joint; wherein at least one bend is provided in an air circuit composed of the air inlet joint, the air outlet joint and the air supply pipeline.

[0007] In one embodiment of the present invention, the gas delivery pipelines include at least two, and the at least two gas delivery pipelines are connected in parallel between the gas inlet connector and the gas outlet connector.

[0008] In one embodiment of the present invention, at least two gas pipelines have different lengths.

[0009] In one embodiment of the present invention, at least two gas pipelines have the same diameter.

[0010] In one embodiment of the present invention, of the two gas pipelines, the length of the longer gas pipeline is 1.5 times the length of the shorter gas pipeline.

[0011] In one embodiment of the present invention, at least two gas transmission pipelines are respectively provided with bends.

[0012] In one embodiment of the present invention, the air inlet connector and the air outlet connector are respectively multi-way connectors, the air inlet connector is provided with one air inlet and multiple air outlets, and the air outlet connector is provided with multiple air inlets and one air outlet.

[0013] In one embodiment of the present invention, the air inlet connector is a T-shaped three-way connector, and the air outlet connector is a Y-shaped three-way connector.

[0014] In one embodiment of the present invention, the pipeline sections at both ends of the gas transmission pipeline overlap axially with the gas outlet of the gas inlet connector and the gas inlet of the gas outlet connector, respectively.

[0015] The present invention also provides a method for reducing noise of an air suspension air supply unit, comprising:

[0016] Cut off a section of the pipeline between the air pump and the distribution valve in the air supply unit, and install a three-way joint on the cut pipeline port;

[0017] Select two gas pipelines with a length ratio of 2:3 and connect them between the two three-way joints;

[0018] The pulse gas output by the air pump is divided into a distribution valve through a three-way joint and two gas pipelines.

[0019] The beneficial effects of the present invention are as follows: the pulse airflow is separated by a dual-channel gas transmission pipeline, so that the single pulse energy is cut into two parts, and the energy of the pulse airflow is weakened by the bends arranged in the gas path, so as to achieve the effect of reducing the single pulse energy and eliminating high-frequency noise. At the same time, the structure is relatively simple, and only a section of pipeline and two joints need to be added to achieve the slow release of the pulse, and the cost is low and the layout space is small.

[0020] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments consistent with the present invention, and together with the specification, are used to explain the principles of the present invention. Obviously, the drawings described below are only some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0022] Figure 1 It is a structural schematic diagram of the noise reduction device of the air suspension air supply unit of the present invention;

[0023] Figure 2 It is a schematic diagram of the change of the air pressure state of the pulse airflow after the air supply unit noise reduction device is adopted in the present invention;

[0024] Figure 3 The present invention is a flow chart of a method for reducing noise of an air suspension air supply unit.

[0025] In the figure: 1. Air inlet connector; 2. Air outlet connector; 3. Air pipeline; 4. Bend. DETAILED DESCRIPTION

[0026] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied by other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the features in the following embodiments and embodiments can be combined with each other without conflict. It should also be understood that the terms used in the embodiments of the present invention are to describe specific specific embodiments, rather than to limit the scope of protection of the present invention.

[0027] See also Figures 1 to 3 . It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings in this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any structural modification, change in proportional relationship, or adjustment of size, without affecting the effects and purposes that can be achieved by the present invention, should still fall within the scope of the technical content disclosed by the present invention. At the same time, the terms such as position and quantitative relationship cited in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0028] See also Figure 1The present invention provides a noise reduction device for an air suspension air supply unit, comprising an air inlet joint 1, an air outlet joint 2 and an air supply pipeline 3, wherein the air inlet joint 1 is connected to an air pump end of the air supply unit; the air outlet joint 2 is connected to a distribution valve end of the air supply unit; the air supply pipeline 3 is connected between the air inlet joint 1 and the air outlet joint 2; wherein at least one bend 4 is provided in the air circuit composed of the air inlet joint 1, the air outlet joint 2 and the air supply pipeline 3.

[0029] Specifically, in the embodiment of the present invention, a pipeline joint and a corresponding air supply pipeline 3 are newly installed in the air supply unit of the air suspension, the pipeline layout in the air supply unit is changed, and the air flow path generated by the air pump in the air supply unit is adjusted, the pulse effect of the gas provided by the air pump is reduced, and the noise generated by its pulse energy is reduced. By setting a bend 4 in the air path composed of the air inlet joint 1, the air outlet joint 2 and the air supply pipeline 3, the air flow is decelerated and guided, the impact force of the air flow in the pipeline is reduced, and the noise caused by the pulsating air flow generated by the air pump is effectively reduced. In addition, the bend 4 in the pipeline can also disturb the air flow to a certain extent, so that the stability of the air flow is improved, and the irregularity and pulsation phenomenon in the air flow output by the air pump are reduced, thereby achieving a noise reduction effect.

[0030] More specifically, the air inlet connector 1 is used to connect with the air pump end of the air supply unit. The air flow generated by the air pump enters the air delivery pipeline 3 through the air inlet connector 1. The air inlet connector 1 can adopt a component with a streamlined design to slow down the sudden change of the air flow and avoid high-frequency noise. Similarly, the air inlet connector 1 can adopt a design with a built-in spoiler or a diffusion structure, so that the intake air flow can be evenly distributed when entering the pipeline, reducing the irregularity of the air flow, thereby reducing the pulsation and noise of the air flow. The air outlet connector 2 is connected to the distribution valve end of the air supply unit to output the processed air flow to the airbag system of the air suspension. The air outlet connector 2 can be designed as a conical or smooth transition structure to reduce the turbulence generated during the air flow and reduce noise. The air delivery pipeline 3 is used to connect the air inlet connector 1 and the air outlet connector 2, and assumes the function of air flow transmission. In order to further reduce noise, at least one bend 4 can be set in the air path, and the angle and radius of the bend 4 can be optimized according to the flow rate and frequency characteristics of the air flow. The bend 4 can play a role in expanding the air flow path and reducing the rapid change of the air flow, thereby reducing the generation of pulsation noise. When the airflow passes through the bend 4, a specially designed shock-absorbing or sound-absorbing material is used to wrap the pipe to absorb the noise generated by the vibration of the airflow. For example, the inner wall of the pipe can be coated with a sound-absorbing material, or a sound insulation layer can be added to the outside of the pipe.

[0031] Furthermore, the positions of the bends 4 on the air inlet connector 1, the air outlet connector 2 and the air supply pipeline 3 can be adjusted according to the spatial arrangement of the pipeline between the air pump and the distribution valve in the air supply unit. For example, the air inlet connector 1 and the air outlet connector 2 can be set to have a certain angle, or multiple bends 4 can be set on the air supply pipeline 3 to improve the space utilization rate in the installation structure of the air supply unit. In other words, the bends 4 set in the air circuit composed of the air inlet connector 1, the air outlet connector 2 and the air supply pipeline 3 can not only meet the requirements of optimizing the spatial arrangement, but also meet the requirements of weakening the airflow pulse effect in the air circuit of the air supply unit, thereby ultimately achieving the purpose of noise reduction.

[0032] Furthermore, the gas pipelines 3 include at least two, and the at least two gas pipelines 3 are connected in parallel between the gas inlet connector 1 and the gas outlet connector 2. The at least two gas pipelines 3 have different lengths.

[0033] Specifically, in at least two gas pipelines 3 of the embodiment of the present invention, the airflow output by the air pump is diverted to reduce the air volume in a single gas pipeline 3, reduce the pulse effect of the airflow, and thus control the noise level. Gas pipelines 3 of different lengths will cause the propagation time and path length of the airflow in each pipeline to change. Longer gas pipelines 3 will cause the propagation time of the airflow to be longer, while the airflow passes quickly through shorter gas pipelines 3. This difference can cause the airflow to attenuate the noise to different degrees on different paths. When the airflow propagates in gas pipelines 3 of different lengths, the pressure fluctuations in each gas pipeline 3 may reach peaks at different times, resulting in phase differences. This phase difference can cause the noise to offset or reduce each other in different pipelines, thereby playing a certain noise reduction role.

[0034] More specifically, due to the differences in the lengths of the gas pipelines 3, the flow rates of the airflow may also be different in each gas pipeline 3. The slower airflow rate in the longer gas pipeline 3 may reduce the high-frequency noise generated by the rapid changes in the airflow. In contrast, the faster airflow rate in the shorter gas pipeline 3 may have a higher noise frequency, but due to the parallel design, this part of the noise will interfere with and offset each other in different paths. The length and shape of each pipeline may match certain frequencies of the airflow, forming a resonance phenomenon. If the lengths of the gas pipelines 3 are different, the vibration frequencies of the airflow in the gas pipelines 3 will be different, thereby avoiding the resonance phenomenon of all gas pipelines 3 at the same frequency and reducing the noise increase caused by the resonance.

[0035] That is to say, by making the at least two gas pipelines 3 have different lengths, the pulsed airflow input from the gas inlet connector 1 needs to take different times in the gas pipelines 3 of different lengths to reach the gas outlet connector 2, thereby causing a time difference in the diverted pulsed airflow when it arrives at the gas outlet connector 2. This not only reduces the pulse energy of the airflow in each gas pipeline 3, but also prevents each pulsed airflow in each gas pipeline 3 from merging, ultimately reducing the energy impact caused by the airflow pulse, making the accumulated energy insufficient to excite the resonance of the components, thereby achieving the purpose of eliminating high-frequency noise.

[0036] Furthermore, at least two gas pipelines 3 have the same diameter. Of the two gas pipelines 3 , the length of the longer gas pipeline 3 is 1.5 times the length of the shorter gas pipeline 3 .

[0037] Specifically, in an embodiment of the present invention, after the pulse airflow output by the air pump enters at least two air pipelines 3, the same pipe diameter of the air pipelines 3 is used so that the time for the pulse airflow to reach the air outlet connector 2 is only related to the length of the air pipelines 3. At the same time, according to the periodic characteristics of the pulse airflow, the lengths of the two air pipelines 3 differ by 50%. In this way, the airflows in the two pipelines arrive at the air outlet connector 2 at a time interval of half a pulse period, which maximizes the reduction of the airflow pulse effect and can balance the time difference when the pulse airflows in the two air pipelines 3 arrive at the air outlet connector 2, so that the pulse effect of the continuous supply of airflow by the air pump is evenly applied to the air outlet connector 2, thereby eliminating the high-frequency noise caused by the pulse airflow in the air suspension air supply unit.

[0038] More specifically, since the two gas pipelines 3 have different lengths and the same diameter, different pressure fluctuations and noise will be generated when the airflow passes through the two gas pipelines 3. These noise waves can interact with each other through phase difference interference, and some noise will be cancelled out by interference. In the longer gas pipeline 3, due to the longer propagation time of the airflow, the phase of the noise may be different from the airflow in the shorter gas pipeline 3, resulting in an interference effect, thereby reducing the overall noise. In other words, by optimizing the layout of the gas pipeline 3 and the phase difference of the pulsed airflow therein, the noise in the two gas pipelines 3 can cancel each other out within a certain frequency range, thereby achieving a noise reduction effect.

[0039] See also Figure 1 In one embodiment, at least two gas pipelines 3 are respectively provided with bends 4. The air inlet connector 1 and the air outlet connector 2 are respectively multi-way connectors, the air inlet connector 1 is provided with one air inlet and multiple air outlets, and the air outlet connector 2 is provided with multiple air inlets and one air outlet.

[0040] Specifically, at least two gas pipelines 3 are installed by cutting off the original gas pipeline between the air pump and the distribution valve, and the bend 4 is also provided on the gas pipeline 3. On the one hand, the effect of offsetting the air flow pulse is enhanced, and on the other hand, it is convenient to arrange according to the spatial structure. More specifically, the two gas pipelines 3 provided with the bend 4 can be located in the same plane, which is convenient for directly assembling the noise-reducing gas path structure before modifying the gas path structure of the gas supply unit. It is also suitable for the three-way joint structure connecting the two gas pipelines 3, and there is no need to specially design the pipeline shape of the gas pipeline 3 port for the gas outlet and the gas inlet of the three-way joint. Further, the gas inlet joint 1 and the gas outlet joint 2 arranged on the gas supply pipeline of the air pump are matched with the multiple gas pipelines 3 connected therebetween, and the corresponding number of gas outlets and gas inlets are opened on the gas inlet joint 1 and the gas outlet joint 2. The gas inlet joint 1 distributes the air flow to multiple gas outlets to realize the parallel gas supply of multiple gas pipelines 3.

[0041] See also Figure 1 In one embodiment, the air inlet connector 1 is a T-type three-way connector, and the air outlet connector 2 is a Y-type three-way connector. The pipeline sections at both ends of the air delivery pipeline 3 overlap with the axial direction of the air outlet of the air inlet connector 1 and the air inlet of the air outlet connector 2, respectively.

[0042] Specifically, in the embodiment of the invention, the T-shaped three-way connector used in the air inlet connector 1 is used to distribute the airflow from the main pipe to the two branch pipes, and the pulses are offset in the T-shaped middle section of the air inlet connector 1 to divide the high-pressure gas into two pulses with equivalent energy. The lengths of the gas pipelines 3 connected at both ends of the air outlet of the air inlet connector 1 are different, so that the two airflow pulses have different times when flowing through the gas pipeline 3, so that the two pulses have a time difference when reaching the Y-shaped structure of the air outlet connector 2, so that the energy of each pulse is only half of the original, and the two pulse airflows are not merged again.

[0043] More specifically, the gas pipeline 3 is at an axial overlap angle between the parts connected to the gas inlet connector 1 and the gas outlet connector 2, so as to facilitate the stable connection between the gas pipeline 3 and the gas inlet connector 1 and the gas outlet connector 2, avoid the formation of a bend 4 at the end of the gas pipeline 3 to adapt to the gas inlet connector 1 and the gas outlet connector 2, and ensure its service life through the stable connection of the gas pipeline 3. It should be noted that in the Y-shaped structure of the gas outlet connector 2, the gas inlet and the gas outlet of the gas outlet connector 2 are axially parallel, and are connected through a Y-shaped gas channel in between, so that the two end sections of the gas pipelines 3 installed on the gas inlet of the gas outlet connector 2 are arranged in parallel, which facilitates the smooth flow of the gas pipeline 3 through the gas outlet connector 2 to the distribution valve.

[0044] See also Figure 2 The air pressure of the pulse airflow in the air supply unit before the noise reduction device is used is a periodic pulse airflow, and the air pressure value has corresponding peak and valley states ( Figure 2 When the noise reduction device of the embodiment of the present invention is used, the monitored air pressure value parameter has the effect of cutting valleys and filling peaks ( Figure 2 The pulsed airflow in the air supply unit is divided into two parts by the two air pipelines 3, and the airflows in the two air pipelines 3 are output with a phase difference of half a pulse period, thereby finally achieving a pulsed airflow output in a stable air pressure state.

[0045] See also Figure 3 The present invention also provides a method for reducing noise of an air suspension air supply unit, comprising:

[0046] Cut off a section of the pipeline between the air pump and the distribution valve in the air supply unit, and install a three-way joint on the cut pipeline port;

[0047] Select two gas pipelines with a length ratio of 2:3 and connect them between the two three-way joints;

[0048] The pulse gas output by the air pump is divided into a distribution valve through a three-way joint and two gas pipelines.

[0049] Specifically, in an embodiment of the present invention, a section is cut off from the pipeline between the air pump and the distribution valve to insert and install a three-way joint to divert the pulse gas output by the air pump (the three-way joint divides the pulse gas flow from the air pump into two branches, thereby reducing the unevenness of the pulse gas flow on a single path, reducing pressure fluctuations and vortices, etc.), so that the pulse gas flow is transported through different gas pipelines, thereby reducing the pulse fluctuations of the gas flow and the noise that may be generated. The diversion is achieved by connecting two gas pipelines of different lengths, and the length ratio of the two pipelines is 2:3, so that the gas flow has different propagation delays. More delays will be introduced in the longer gas pipeline, while the gas flow speed is faster in the shorter gas pipeline. The gas flow of the two pipelines can be staggered in time, thereby reducing the superposition effect of the pulse gas flow and reducing noise. Similarly, the combination of long and short pipelines, through the physical time difference, makes the pressure fluctuations of the pulse gas coming out of the air pump in the two pipelines not appear synchronously, avoiding the resonance effect of the pressure wave and the gas flow pulse, thereby reducing noise and vibration. The pulsed air flow output by the air pump is divided into two pipelines through a three-way joint and finally reaches the distribution valve.

[0050] In this way, by installing a three-way joint on the cut-off pipeline and connecting two air supply pipelines of unequal lengths, the pulsed airflow output by the air pump can be diverted and delayed, reducing the synchronization of the airflow pulses, thereby effectively reducing the noise and vibration in the air suspension air supply unit.

[0051] In summary, the present invention provides an air suspension air supply unit noise reduction device and a noise reduction method thereof, which separates the pulse airflow through a dual-channel air supply pipeline, cuts the single pulse energy into two parts, and cooperates with the bends set in the air path to weaken the energy of the pulse airflow, so as to achieve the effect of reducing the single pulse energy and eliminating high-frequency noise.

[0052] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A noise reduction device for an air suspension air supply unit, characterized in that: include: An air inlet connector (1), the air inlet connector (1) being connected to an air pump end of the air supply unit; An air outlet connector (2), the air outlet connector (2) being connected to a distribution valve end of the air supply unit; and A gas delivery pipeline (3), the gas delivery pipeline (3) being connected between the gas inlet connector (1) and the gas outlet connector (2); Wherein, at least one bend (4) is provided in the gas path formed by the gas inlet connector (1), the gas outlet connector (2) and the gas transmission pipeline (3).

2. The noise reduction device according to claim 1, characterized in that: The gas delivery pipeline (3) comprises at least two, and the at least two gas delivery pipelines (3) are connected in parallel between the gas inlet connector (1) and the gas outlet connector (2).

3. The noise reduction device according to claim 2, characterized in that: At least two of the gas transmission pipelines (3) have different lengths.

4. The noise reduction device according to claim 3, characterized in that: The diameters of at least two of the gas transmission pipelines (3) are the same.

5. The noise reduction device according to claim 4, characterized in that: Of the two gas pipelines (3), the length of the longer gas pipeline (3) is 1.5 times the length of the shorter gas pipeline (3).

6. The noise reduction device according to claim 5, characterized in that: At least two of the gas transmission pipelines (3) are respectively provided with bends (4).

7. The noise reduction device according to claim 1, characterized in that: The air inlet connector (1) and the air outlet connector (2) are respectively multi-way connectors; the air inlet connector (1) is provided with an air inlet and a plurality of air outlets, and the air outlet connector (2) is provided with a plurality of air inlets and a single air outlet.

8. The noise reduction device according to claim 7, characterized in that: The air inlet connector (1) is a T-shaped three-way connector, and the air outlet connector (2) is a Y-shaped three-way connector.

9. The noise reduction device according to claim 8, characterized in that: The pipeline sections at both ends of the gas transmission pipeline (3) respectively overlap axially with the gas outlet of the gas inlet connector (1) and the gas inlet of the gas outlet connector (2).

10. A method for reducing noise of an air suspension air supply unit, characterized in that: include: Cut off a section of the pipeline between the air pump and the distribution valve in the air supply unit, and install a three-way joint on the cut pipeline port; Select two gas pipelines with a length ratio of 2:3 and connect them between the two three-way joints; The pulse gas output by the air pump is divided into a distribution valve through a three-way joint and two gas pipelines.

Images