Noise-reducing intake structure and turbocharger

Abstract

This invention discloses an intake structure and turbocharger capable of noise reduction, relating to the field of engine technology. It includes an intake body and at least one bypass structure. The intake body has a main inner cavity. Each bypass structure is fixedly connected to the outer wall of the intake body and forms a bypass inner cavity. The outer wall of the intake body located within each bypass inner cavity is a first outer wall. Each first outer wall has an airflow inlet and multiple airflow outlets. The multiple airflow outlets and airflow inlet are sequentially arranged along the direction from the air inlet to the air outlet of the intake body. All the multiple airflow outlets and airflow inlets are connected to the main inner cavity. Sound waves can enter the bypass inner cavity through the airflow inlet and enter the main inner cavity through each airflow outlet. The sound waves from the bypass inner cavity can cancel out the sound waves propagating in the main inner cavity. This invention achieves noise reduction through structural improvements to the intake structure, which is beneficial for operation and reduces costs.

Description

Technical Field

[0001] This invention relates to the field of engine technology, and in particular to an intake structure and turbocharger capable of reducing noise. Background Technology

[0002] In recent years, to meet the requirements of high power and high economy in modern internal combustion engines, especially the requirements of turbocharged diesel engines for transportation and construction machinery to maintain sufficient boost pressure over a wide range of speeds and loads to achieve satisfactory low-speed performance (economic performance and emission standards), the matching turbocharger compressor must have both high efficiency and a wide stable operating range, particularly requiring a high pressure ratio at low flow rates. This necessitates a shift in the compressor's surge line towards lower flow rates. Incorporating an intake bypass recirculation system into the compressor's intake structure is an effective technical measure to broaden the compressor's stable operating range at low flow rates and is now widely used.

[0003] With advancements in design technology, turbochargers are continuously evolving towards higher flow rates and higher pressure ratios, making noise issues increasingly prominent. Excessive noise not only poses a potential hazard to normal equipment operation but also hinders the normal work of personnel. Numerous studies have confirmed that the high-frequency aerodynamic noise of the compressor is one of the main noise sources of the turbocharger. Reducing the aerodynamic noise of the compressor can effectively reduce the overall noise of the turbocharger. One of the main methods for noise reduction is to control noise along its propagation path. Currently, the most common approach is to install mufflers on the intake structure to reduce noise, with few measures involving changes to the compressor's intake structure itself. Summary of the Invention

[0004] The purpose of this invention is to provide an intake structure and turbocharger that can reduce noise, so as to solve the problems existing in the prior art. The noise reduction effect is achieved by improving the intake structure, which is beneficial to operation and can reduce costs.

[0005] To achieve the above objectives, the present invention provides the following solution:

[0006] This invention provides an intake structure capable of noise reduction, comprising an intake body and at least one bypass structure, wherein:

[0007] The air intake body is provided with a main inner cavity;

[0008] Each of the bypass structures is fixedly connected to the outer wall of the intake body and forms a bypass cavity. The outer wall of the intake body located in each of the bypass cavities is a first outer wall. Each first outer wall is provided with an airflow inlet and multiple airflow outlets. The multiple airflow outlets and the airflow inlet are arranged sequentially along the direction from the air inlet of the intake body to the air outlet of the intake body. The multiple airflow outlets and the airflow inlet are all connected to the main cavity. Sound waves can enter the bypass cavity through the airflow inlet and enter the main cavity through each of the airflow outlets. The sound waves from the bypass cavity can cancel each other with the sound waves propagating in the main cavity.

[0009] Preferably, it further includes at least one variable channel assembly, with one variable channel assembly disposed within each of the bypass cavities. Each variable channel assembly includes a fixed wall, a movable wall, and an elastic member. The fixed wall is fixedly connected to the first outer wall and forms an adjustment cavity with an opening at one end near the airflow inlet. The movable wall is disposed at the opening of the adjustment cavity and can close the adjustment cavity. The movable wall is disposed on the side of the airflow inlet near the air inlet of the air intake body. The two ends of the elastic member are fixedly connected to the air intake body and the movable wall, respectively. At least two airflow outlets can communicate with the adjustment cavity. The airflow in the main cavity can enter the bypass cavity through the airflow inlet and push the movable wall to move away from the airflow inlet. The movable wall can move towards the end near the airflow inlet under the elastic force of the elastic member.

[0010] Preferably, the variable channel assembly can divide the bypass cavity into the regulating cavity and the outer cavity, the outer cavity being connected to both the airflow inlet and the airflow outlet located away from the airflow inlet.

[0011] Preferably, the sound waves travel different distances in at least two of the airflow outlets.

[0012] Preferably, the plane containing the two inner sidewalls of each airflow outlet has the same angle with the longitudinal section of the air intake body, while the plane containing the inner sidewalls of the plurality of airflow outlets has different angles with the longitudinal section of the air intake body.

[0013] Preferably, the distance the sound wave travels from the airflow inlet to each of the airflow outlets within the main cavity is d. 1i The travel distance of the sound wave in each of the bypass sound transmission channels is d. 2i , i is the sequence number of each of the bypass sound transmission channels in the direction from the air inlet to the air outlet of the air intake body, |d 2i -d 1i|=(n+0.5)λ, where λ is the wavelength of the sound wave and n is an integer greater than or equal to 0.

[0014] Preferably, the wavelength of the sound wave is the discrete single-tone noise wavelength of the compressor at a set speed, |d 2i -d 1i |=(n+0.5)λ j , λ j Let be the discrete single-tone noise wavelength of the compressor at the j-th set speed, where j is an integer greater than 0, j = i.

[0015] Preferably, it further includes multiple support pillars, and the number of bypass structures is one. The bypass cavity, the airflow inlet, each of the airflow outlets, the regulating cavity, and the moving wall are all annular. At least one support pillar is provided in the airflow inlet that can be fixedly connected to the two inner walls of the airflow inlet. At least one support pillar is provided in each of the airflow outlets that can be fixedly connected to the two inner walls of the airflow outlet.

[0016] Preferably, it further includes a support plate, which is disposed at the opening of the adjustment cavity, with a gap between the support plate and the inner sidewall of the adjustment cavity, the support plate being fixedly connected to the first outer sidewall, the support plate being disposed at the air inlet end of the movable wall away from the air inlet body, the support plate being disposed at the airflow inlet, and the two ends of the elastic member being fixedly connected between the support plate and the movable wall respectively.

[0017] The present invention also provides a turbocharger, including a compressor and the aforementioned noise-reducing intake structure, wherein the intake body is connected to the compressor.

[0018] The present invention achieves the following technical effects compared to the prior art:

[0019] This invention provides an intake structure and a supercharger capable of noise reduction. The outer side wall of the intake body located in each of the bypass cavities is a first outer side wall. Each first outer side wall is provided with an airflow inlet and multiple airflow outlets. The multiple airflow outlets and the airflow inlet are arranged sequentially along the direction from the air inlet to the air outlet of the intake body. The multiple airflow outlets and the airflow inlet are all connected to the main cavity. Sound waves can enter the bypass cavity through the airflow inlet and enter the main cavity through each of the airflow outlets. The sound waves from the bypass cavity can cancel each other with the sound waves propagating in the main cavity. By setting up an airflow inlet and outlet that connects the main cavity and the bypass cavity, sound waves can pass through the airflow inlet, bypass cavity, and airflow outlet sequentially. At the same time, the sound waves can propagate along the length of the intake body in the main cavity, forming multiple sound transmission channels in the main cavity and the bypass cavity. When the sound waves in the bypass cavity enter the main cavity from each airflow outlet, they can produce destructive interference with the sound waves in the main cavity at the intersection of the main cavity and each airflow outlet, thereby achieving noise reduction. This invention achieves noise reduction by improving the structure based on compressor stabilization technology, which is beneficial for operation and can reduce costs. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 A schematic diagram of the noise-reducing air intake structure provided in Example 1;

[0022] Figure 2 An enlarged view of the variable channel assembly provided in Example 1;

[0023] Figure 3 A schematic diagram of sound wave propagation capable of noise reduction provided in Example 1;

[0024] In the diagram: 100. Noise-reducing air intake structure; 1. Air intake body; 101. Main inner cavity; 102. Airflow inlet; 103. Airflow outlet; 104. Air inlet; 105. Air outlet; 106. Flange; 2. Bypass structure; 201. Bypass inner cavity; 202. Sealing plate two; 203. Tubular outer wall; 3. Variable channel assembly; 301. Fixed wall; 302. Moving wall; 303. Elastic component; 304. Outer cavity; 305. Opening; 306. Sealing plate one; 307. Tubular sidewall; 4. Column; 5. Support plate. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] The purpose of this invention is to provide an intake structure and turbocharger that can reduce noise, so as to solve the problems existing in the prior art. The noise reduction effect is achieved by improving the intake structure, which is beneficial to operation and can reduce costs.

[0027] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] Example 1

[0029] like Figures 1-3 As shown, this embodiment provides an intake structure 100 capable of noise reduction, including an intake body 1 and at least one bypass structure 2, wherein: the intake body 1 is provided with a main inner cavity 101; each bypass structure 2 is fixedly connected to the outer side wall of the intake body 1 and forms a bypass inner cavity 201, the outer side wall of the intake body 1 located in each bypass inner cavity 201 is a first outer side wall, each first outer side wall is provided with an airflow inlet 102 and multiple airflow outlets 103, the multiple airflow outlets 103 and the airflow inlet 102 are arranged sequentially along the direction from the air inlet 104 of the intake body 1 to the air outlet 105 of the intake body 1, the multiple airflow outlets 103 and the airflow inlet 102 are all connected to the main inner cavity 101, sound waves can enter the bypass inner cavity 201 through the airflow inlet 102 and enter the main inner cavity 101 through each airflow outlet 103, the sound waves from the bypass inner cavity 201 can cancel each other with the sound waves propagating in the main inner cavity 101. By setting an airflow inlet 102 and multiple airflow outlets 103 that connect the main inner cavity 101 and the bypass inner cavity 201, sound waves can pass through the airflow inlet 102, the bypass inner cavity 201 and the airflow outlets 103 in sequence. At the same time, the sound waves can propagate along the length of the intake body 1 in the main inner cavity 101, forming multiple sound transmission channels in the main inner cavity 101 and the bypass inner cavity 201. When the sound waves in the bypass inner cavity 201 enter the main inner cavity 101 from each airflow outlet 103, they can produce destructive interference with the sound waves in the main inner cavity 101 at the intersection of the main inner cavity 101 and each airflow outlet 103, thereby achieving noise reduction. This embodiment achieves the noise reduction effect by improving the structure based on the compressor stabilization technology, without the need to set up a silencer, which is conducive to operation and implementation and can reduce costs.

[0030] It should be noted that the air inlet 104 of the air intake body 1 is in a low-pressure environment, while the air outlet 105 of the air intake body 1 is in a high-pressure environment. The airflow in the main inner cavity 101 flows from the high-pressure side to the low-pressure side. By positioning the air inlet 102 at the air outlet 105 of the air intake body 1, the airflow can pass through the air inlet 102, flow through the bypass inner cavity 201, and exit from the air outlet 103 into the main inner cavity 101, before flowing back to the impeller for pressurization. From the air outlet 105 to the air inlet 104 of the air intake body 1, the air pressure at the multiple air outlets 103 gradually decreases, allowing the airflow entering through the air inlet 102 to pass through the bypass inner cavity 201 and exit from each air outlet 103, before flowing back to the impeller for pressurization.

[0031] In this embodiment, the path of the sound wave propagating from the airflow inlet 102 to each airflow outlet 103 in the main cavity 101 is d. 1i The path length of the sound wave in each of the bypass sound channels is d. 2i , i is the sequential number of each bypass sound transmission channel along the direction from the air inlet 104 to the air outlet 105 of the air intake body 1, the wavelength of the sound wave is λ, λ is specifically the wavelength of discrete single-tone noise, |d 2i -d 1i |=(n+0.5)λ, where n is an integer greater than or equal to 0. The sound wave enters through the main cavity 101 and propagates within both the main cavity 101 and the bypass cavity 201. The airflow inlet 102 is used as the starting point for sound wave calculation, and the intersection of the i-th airflow outlet 103 and the main cavity 101 is the ending point. The path of the sound wave propagating from the airflow inlet 102 to the i-th airflow outlet 103 within the main cavity 101 is the i-th main path. The path of the sound wave through the airflow inlet 102, the bypass cavity 201, and the i-th airflow outlet 103 is the i-th bypass path. The difference between the i-th main path and the i-th bypass path is an odd multiple of half the wavelength of the sound wave, forming destructive interference and achieving noise reduction. In this embodiment, the sound wave path within the main cavity 101 is fixed. In the bypass cavity 201, the path of each airflow outlet 103 is... Figure 3 As shown, the sound wave propagation paths are different from right to left and are continuous within a certain range. This results in the sound wave path difference corresponding to each airflow outlet 103 being continuous within a certain range. Therefore, this embodiment can achieve noise reduction effect on noise within a certain wavelength range by opening each airflow outlet 103.

[0032] In this embodiment, at least one variable channel component 3 is also included. Each bypass cavity 201 is provided with a variable channel component 3. Each variable channel component 3 includes a fixed wall 301, a movable wall 302, and an elastic member 303. The fixed wall 301 is fixedly connected to the first outer wall and forms an adjustment cavity with an opening 305 at one end near the airflow inlet 102. The movable wall 302 is disposed at the opening 305 of the adjustment cavity and can close the adjustment cavity. The movable wall 302 is disposed on the side of the airflow inlet 102 near the air inlet 104 of the air intake body 1. The two ends of the elastic member 303 are fixedly connected to the air intake body 1 and the movable wall 302, respectively. At least two airflow outlets 103 can communicate with the adjustment cavity. The airflow in the main cavity 101 can enter the bypass cavity 201 through the airflow inlet 102 and push the movable wall 302 to move away from the airflow inlet 102. The movable wall 302 can move towards the end near the airflow inlet 102 under the elastic force of the elastic member 303. When the compressor speed changes, the airflow pressure entering the main inner cavity 101 changes, and the pressure at the opening 305 of the regulating cavity changes. The moving wall 302 moves upward under the action of the airflow, and the upward movement changes with the airflow pressure in the main inner cavity 101. The deformation of the elastic component 303 also changes, and the position of the moving wall 302 changes between the initial position and the final position. Figure 2 The solid line indicates the starting position of the moving wall 302, and the dashed line indicates the ending position. When the moving wall 302 is in the starting position, the air inlet 104 of the air outlet 103 is closed due to the sealing effect of the moving wall 302. As the moving wall 302 slides upward, the air outlets 103 open sequentially along the axial direction of the intake body 1, connecting sequentially with the regulating chamber. This embodiment can adjust the number of opening air outlets 103 according to the pressure of the intake airflow, enabling adaptive adjustment of the noise reduction effect.

[0033] In this embodiment, the wavelength of the sound wave is the discrete single-tone noise wavelength of the compressor at a set speed, |d 2i -d 1i |=(n+0.5)λ j , λ j Let j be the wavelength of the discrete single-tone noise of the compressor at the j-th set speed, where j is an integer greater than 0, j = i. The higher the speed, the greater the pressure difference across the moving wall 302, and the higher the frequency of the discrete single-tone noise. When the moving wall 302 is pushed to slide towards the termination position, the multiple airflow outlets 103 in the regulating chamber move along the direction from the outlet 105 to the inlet 104. Figure 3 The air outlets (shown from left to right) are opened sequentially. By rationally setting the formation at the air outlets 103, the frequency of noise that the channels corresponding to the multiple air outlets 103 in the left-to-right direction can handle increases sequentially. Taking the high, medium, and low speed settings as an example, when the compressor is at a low speed... Figure 3 The first airflow outlet 103 from right to left is opened to reduce discrete monotone noise corresponding to low speeds. When the compressor is at medium speed, Figure 3 The second airflow outlet 103 from right to left is opened to reduce discrete monotone noise at medium speeds, whereas at high compressor speeds... Figure 3 The third airflow outlet 103 from right to left is opened to reduce the discrete single-tone noise corresponding to high speed. Since the stroke difference at each airflow outlet 103 is continuous, it ensures that when the compressor speed varies within a certain range, the corresponding discrete single-tone noise will always undergo destructive interference. This embodiment achieves good noise reduction for compressors at multiple speeds, reducing potential hazards to normal equipment operation and benefiting the normal work and life of staff. It should be noted that the specific dimensions of the stroke difference and related structures such as the airflow inlet 102 and airflow outlet 103 can be specifically set through experiments, finite element simulations, etc.

[0034] In this embodiment, the variable channel assembly 3 can divide the bypass inner cavity 201 into an adjustment cavity and an outer cavity 304. The outer cavity 304 is connected to both the airflow inlet 102 and the airflow outlet 103 away from the airflow inlet 102.

[0035] In this embodiment, the sound waves travel different distances in at least two airflow outlets 103.

[0036] In this embodiment, the angle between the plane containing the two inner sidewalls of each airflow outlet 103 and the longitudinal section of the air intake body 1 is the same, while the angle between the plane containing the inner sidewalls of multiple airflow outlets 103 and the longitudinal section of the air intake body 1 is different. For a single airflow outlet 103, the travel distance of the sound wave within the main cavity 101 and the bypass cavity 201 can be canceled out. Therefore, the magnitude of the travel difference can be mainly determined by the travel distance at the airflow outlet 103. By making the inclination angles of the inner sidewalls of the airflow outlets 103 different, the travel distances of the sound waves within the airflow outlets 103 can be made different, thus enabling... Figure 3 The path difference between sound waves 3, 4, and 5 and sound wave 1 is different. Figure 3 The travel distance of the intermediate sound wave 2 is also affected by the fixed wall 301, therefore Figure 3 The travel difference between sound wave 2 and sound wave 1, and the travel differences between sound waves 3, 4, and 5 and sound wave 1 are all different. Therefore, sound waves 2, 3, 4, and 5 undergo different destructive interferences with sound wave 1. The wavelengths of the destructive interferences between the bypass transmission channels corresponding to the multiple airflow outlets 103 and the sound waves in the main cavity 101 are different. When the position of the moving wall 302 changes, the wavelength of the destructive interference sound waves can be controlled to adapt to the wavelength changes of discrete single-tone noise caused by the change in compressor speed. This setting makes the suppressed noise wavelength range change with the compressor speed.

[0037] In this embodiment, multiple support pillars 4 are also included, and there is one bypass structure 2. The bypass inner cavity 201, airflow inlet 102, each airflow outlet 103, and regulating cavity are all annular. The bypass structure 2 is a circular tubular structure, and the bypass inner cavity 201 is arranged circumferentially along the bypass structure 2. The airflow inlet 102 and each airflow outlet 103 are both annular in shape and are arranged circumferentially along the air intake body 1. At least one support pillar 4 that can be fixedly connected to the two inner walls of the airflow inlet 102 is provided in the airflow inlet 102; at least one support pillar 4 that can be fixedly connected to the two inner walls of the airflow outlet 103 is provided in the airflow outlet 103. Preferably, the upper and lower walls of the airflow inlet 102 and each airflow outlet 103 are fixedly connected by multiple circumferentially equidistant support pillars 4.

[0038] In this embodiment, a support plate 5 is also included. The support plate 5 is disposed at the opening 305 of the adjustment cavity. A gap is left between the support plate 5 and the inner sidewall of the adjustment cavity. The support plate 5 is fixedly connected to the first outer sidewall. The support plate 5 is disposed at one end of the movable wall 302 away from the air inlet 104 of the air intake body 1. The support plate 5 is disposed at the airflow inlet 102. Specifically, the support plate 5 is disposed on the side of the airflow inlet 102 close to the air inlet 104 of the air intake body 1. The two ends of the elastic member 303 are respectively fixedly connected between the support plate 5 and the movable wall 302.

[0039] In this embodiment, there are four airflow outlets 103. One airflow outlet 103, which is far away from the airflow inlet 102, is located on the outside of the fixed wall 301 and is not connected to the regulating cavity, but is only connected to the outer cavity 304. The air inlet ends of the other three airflow outlets 103 are located inside the regulating cavity.

[0040] In this embodiment, the fixed wall 301 includes a sealing plate 306 and a tubular sidewall 307. The tubular sidewall 307 is sleeved on the outside of the air intake body 1. The inner and outer sides of the sealing plate 306 are fixed and sealed to the outer sidewall of the air intake body 1 and the tubular sidewall 307, respectively. The movable wall 302 is an annular slider. The inner and outer sides of the movable wall 302 are in close contact with the outer sidewall of the air intake body 1 and the inner side of the tubular sidewall 307, respectively, and can generate relative sliding.

[0041] In this embodiment, the bypass structure 2 consists of an integrally formed tubular outer wall 203 and sealing plates 202 disposed at both ends of the tubular outer wall 203. The lower end of the intake body 1 is a flange 106, used to connect to the end wall of the compressor diffuser. One sealing plate 202 of the bypass structure 2 is fixedly connected to the flange 106. The tubular sidewall 307 is fixedly connected to the tubular outer wall 203 by at least one support 4; preferably, the two are fixedly connected by a plurality of circumferentially equidistant support columns 4.

[0042] In this embodiment, the main inner cavity 101, flange 106, tubular sidewall 307, and tubular outer wall 203 are coaxially arranged.

[0043] In this embodiment, the elastic component 303 is a spring, but it is not limited to springs; it can also be other elastic components that can stretch and contract along the axial direction.

[0044] Example 2

[0045] This embodiment provides a booster, including a compressor and a noise-reducing intake structure 100 as described in Embodiment 1, with the intake body 1 connected to the compressor.

[0046] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. An air intake structure capable of reducing noise, characterized by: The air intake body and at least one bypass structure are provided, wherein: The air intake body is provided with a main inner cavity; Each bypass structure is fixedly connected with the outer side wall of the air intake body and encloses a bypass inner cavity, the outer side wall of the air intake body in each bypass inner cavity is a first outer side wall, an air inlet and a plurality of air outlets are arranged on each first outer side wall, the plurality of air outlets and the air inlet are sequentially arranged along the direction from the air inlet of the air intake body to the air outlet of the air intake body, the plurality of air outlets and the air inlet are in communication with the main inner cavity, sound waves can enter the bypass inner cavity through the air inlet and enter the main inner cavity through each air outlet, and the sound waves from the bypass inner cavity can destructively interfere with the sound waves propagating in the main inner cavity; At least one variable channel assembly is further provided, one variable channel assembly is arranged in each bypass inner cavity, each variable channel assembly comprises a fixed wall, a moving wall and an elastic component, the fixed wall is fixedly connected with the first outer side wall and forms an adjusting cavity provided with an opening at one end close to the air inlet, the moving wall is arranged at the opening of the adjusting cavity and can close the adjusting cavity, the moving wall is arranged at one side of the air inlet close to the air inlet of the air intake body, and the two ends of the elastic component are fixedly connected with the air intake body and the moving wall respectively, and at least two air outlets can be in communication with the adjusting cavity; the airflow in the main inner cavity can enter the bypass inner cavity through the air inlet and push the moving wall to move away from one end of the air inlet, and the moving wall can move to one end close to the air inlet under the elastic force of the elastic component.

2. The noise reducing air intake structure of claim 1, wherein: The variable channel assembly can separate the bypass inner cavity into the adjusting cavity and an outer side cavity, and the outer side cavity is in communication with the air inlet and the air outlet away from the air inlet.

3. The noise reducing air intake structure of claim 1, wherein: The sound waves travel differently in at least two air outlets.

4. The noise reducing air intake structure of claim 1, wherein: The included angles between the planes of the two inner side walls of each air outlet and the longitudinal section of the air intake body are the same, and the included angles between the planes of the inner side walls of a plurality of air outlets and the longitudinal section of the air intake body are different.

5. The noise reducing air intake structure of claim 1, wherein: The sound wave propagates in the main inner cavity from the air flow inlet to each air flow outlet by a distance d 1i , the sound wave propagates in each bypass sound transmission channel by a distance d 2i , i is the serial number of each bypass sound transmission channel in the direction from the air inlet of the air inlet body to the air outlet of the air inlet body, |d 2i - d 1i |= (n+0.5) λ, λ is the wavelength of the sound wave, and n is an integer greater than or equal to 0.

6. The noise reducing air intake structure of claim 5, wherein: The wavelength of the sound wave is a discrete single tone noise wavelength of the compressor at a set rotational speed, |d 2i - d 1i = (n + 0.5) λ j , λ j is a discrete single tone noise wavelength of the compressor at the jth set rotational speed, j is an integer greater than 0, j = i.

7. The noise reducing air intake structure of claim 2, wherein: A plurality of support columns are further provided, the number of bypass structures is one, the bypass inner cavity, the air inlet, each air outlet, the adjusting cavity and the moving wall are annular, at least one support column capable of being fixedly connected with the two inner walls of the air inlet is arranged in the air inlet; at least one support column capable of being fixedly connected with the two inner walls of the air outlet is arranged in each air outlet.

8. The noise reducing air intake structure of claim 1, wherein: A support plate is further provided, the support plate is arranged at the opening of the adjusting cavity, a gap is left between the support plate and the inner side wall of the adjusting cavity, the support plate is fixedly connected with the first outer side wall, the support plate is arranged at one end of the moving wall away from the air inlet of the air intake body, the support plate is arranged at the air inlet, and the two ends of the elastic component are fixedly connected with the support plate and the moving wall respectively.

9. A supercharger characterized by: The air intake structure capable of reducing noise according to any one of claims 1-8 is connected with the compressor.

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