Resistive muffler and boat

Abstract

The application provides a resistive muffler and a ship. The resistive muffler comprises a shell, an acoustic absorption core and at least one set of Tesla valves. The shell comprises a cavity. The acoustic absorption core is filled in the cavity. Two ends of the acoustic absorption core are surrounded by side walls of the shell to form an air inlet cavity and an air outlet cavity. The Tesla valve is arranged in the acoustic absorption core. The Tesla valve comprises a conducting end, a blocking end and two or more communication holes. The conducting end is one end of the Tesla valve and is communicated with the air outlet cavity. The blocking end is the other end of the Tesla valve and is communicated with the air inlet cavity. The communication holes are arranged on the Tesla valve and are communicated with the cavity. The resistive muffler can solve the technical problem of being unable to suppress characteristic line spectrum noise and can achieve full-band broadband noise elimination.

Description

Technical Field

[0001] The present application relates to the technical field of sound attenuation, and in particular to a resistive silencer and a ship. Background Art

[0002] Resistive mufflers achieve their purpose by fixing fibers or porous sound-absorbing materials along the airflow path. The friction and damping effects of the sound-absorbing materials on the sound waves convert the sound energy propagating through the channel into heat energy. Thanks to the sound-absorbing materials' excellent absorption of mid- and high-frequency sound waves, resistive mufflers generally achieve good sound absorption at these frequencies. When the cross-sectional area of ​​the sound wave channel is too large and the sound wave frequency reaches a certain level, the wavelength of the sound wave becomes longer, and it will pass through the muffler in the form of a narrow beam. At this point, the sound wave has little or no contact with the sound-absorbing material on the muffler wall, ultimately resulting in a significant decrease in the resistive muffler's sound absorption effect at high frequencies, causing the acoustic phenomenon of "high-frequency failure." When the sound wave frequency is above the failure frequency, the sound attenuation of the resistive muffler decreases by approximately one-third compared to the sound attenuation at the failure frequency for each octave increase.

[0003] To compensate for the poor low-frequency sound absorption and high-frequency inefficiency of resistive mufflers, existing technologies typically incorporate fin, acoustic streaming, honeycomb, and labyrinth structures within the muffler to increase the muffler's attenuation coefficient, improve high-frequency inefficiency, and mitigate low-frequency noise. However, these structures fail to effectively suppress the characteristic line spectrum of low-frequency noise, and thus fail to achieve effective noise reduction. Summary of the Invention

[0004] The present application provides a resistive muffler and a ship to solve the technical problem of being unable to suppress characteristic line spectrum noise.

[0005] The present application provides a resistive silencer comprising a shell, a sound-absorbing core and at least one set of Tesla valves, wherein the shell comprises a cavity; the sound-absorbing core is filled in the cavity, and the two ends of the sound-absorbing core respectively form an air inlet cavity and an air outlet cavity with the side walls of the shell; the Tesla valve is inserted into the sound-absorbing core, and the Tesla valve comprises a conducting end, a blocking end and two or more communicating holes, the conducting end being one end of the Tesla valve and being connected to the air outlet cavity; the blocking end being the other end of the Tesla valve and being connected to the air inlet cavity; and the two or more communicating holes are opened on the Tesla valve and are connected to the cavity.

[0006] Optionally, each group of Tesla valves includes at least one air duct assembly, and each air duct assembly includes two pipes, wherein the curvature at the head end of one of the pipes is K1, the curvature at the tail end thereof is K2, and 0≤K1 / K2<1; the two head ends belonging to the two pipes are connected, and the two tail ends thereof are connected; the middle parts of the two pipes are isolated by a portion of the sound-absorbing core; when each group of Tesla valves includes more than two air duct assemblies, the head end of a first pipe assembly is connected to the tail end or the air inlet cavity of the second pipe assembly; the tail end of the first pipe assembly is connected to the head end or the air outlet cavity of the third air duct assembly.

[0007] Optionally, each of the air duct components includes a first pipe and a partially bent second pipe, and the first pipes of more than two air duct components are connected in sequence to form a main passage; the second pipes of any two adjacent air duct components are respectively located on both sides of the main passage; the connecting holes are provided on the first pipe and the second pipe.

[0008] Optionally, the first pipe is a straight pipe, and in each of the main passages, the central axes of any two adjacent first pipes form an angle, and the angle is an obtuse angle.

[0009] Optionally, the second pipeline includes a straight pipe and an arc-shaped pipe, and the tail end of the straight pipe is connected to the head end of the arc-shaped pipe, and the ratio of the arc length of the arc-shaped pipe to the length of the second pipeline ranges from 0 to 1.

[0010] Optionally, the cross-sectional area of ​​the first pipe is equal to or proportional to the cross-sectional area of ​​the second pipe.

[0011] Optionally, the resistive muffler includes two or more groups of Tesla valves, and the Tesla valves are arranged in a linear array with equal spacing.

[0012] Optionally, the resistive muffler further includes an inlet flange and an outlet flange, wherein the inlet flange is connected to one end of the shell and communicates with the air inlet cavity; the outlet flange is connected to the other end of the shell and communicates with the air outlet cavity.

[0013] Optionally, the side wall of the shell that forms the air inlet cavity is conical, and its cross-sectional area gradually increases along the direction from the air inlet cavity to the air outlet cavity; the side wall of the shell that forms the air outlet cavity is conical, and its cross-sectional area gradually decreases along the direction from the air inlet cavity to the air outlet cavity.

[0014] Optionally, the sound-absorbing core includes at least one insertion hole, and each insertion hole is penetrated by a Tesla valve; the exterior of the Tesla valve is covered with a protective layer, and the outer wall of the protective layer is adhered to the hole wall of the through hole.

[0015] Optionally, the resistive silencer further includes two baffles, which are arranged parallel to the cavity, with the side walls of the baffles affixed to the inner wall of the cavity and one end face thereof abutting against the sound-absorbing core; any of the baffles is provided with at least one mounting hole, the mounting hole of one baffle is connected to the conducting end, and the mounting hole of the other baffle is connected to the blocking end.

[0016] Correspondingly, the present application also provides a ship, which includes a resistive muffler, and the resistive muffler is the resistive muffler described in any one of the above items.

[0017] The present application provides a resistive silencer and a ship. In the present application, the conducting end of the Tesla valve is connected to the air outlet cavity, and the blocking end thereof is connected to the air inlet cavity, so that the gas can flow from the air inlet cavity through the Tesla valve to the air outlet cavity; since the cavity is filled with a sound-absorbing core, when the gas flows through each circuit, the flow directions of the two gases are opposite. Although there is a certain pressure loss due to a slight increase in the resistance coefficient, the flow rate and pressure loss of the gas inside the Tesla valve are reduced, and the total pressure loss of the muffler is also greatly reduced; in addition, the sound waves can better contact the sound-absorbing core, dissipate more sound waves, and improve the sound attenuation coefficient of the resistive silencer.

[0018] Due to the special circuit design inside the Tesla valve, when the gas flows through each circuit, the flow distances of the two gases are different, forming a phase difference and thus achieving interference noise reduction; therefore, by controlling the lengths of the two airways and aligning the resonant frequency of the Tesla valve with the characteristic line spectrum noise, precise control of the characteristic line spectrum can be achieved to eliminate noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] 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.

[0020] Figure 1 is a cross-sectional view of a resistive muffler provided in this application;

[0021] Figure 2 is a perspective view of the Tesla valve array provided by this application;

[0022] Figure 3a This is the transmission loss curve of Tesla valve interference silencing at the resonance silencing frequency of 63Hz;

[0023] Figure 3b This is the transmission loss curve of Tesla valve interference silencing at the resonance silencing frequency of 80Hz;

[0024] Figure 3cis the transmission loss curve of Tesla valve interference sound absorption at the resonance sound absorption frequency of 100 Hz;

[0025] Figure 3d is the transmission loss curve of Tesla valve interference sound absorption at the resonance sound absorption frequency of 125 Hz;

[0026] Figure 3e is the transmission loss curve of Tesla valve interference sound absorption at the resonance sound absorption frequency of 200 Hz;

[0027] Figure 3f is the transmission loss curve of Tesla valve interference sound absorption at the resonance sound absorption frequency of 250 Hz.

[0028] Explanation of reference signs:

[0029] 100, shell; 110, cavity; 111, air inlet cavity; 112, air outlet cavity; 200, inlet flange; 300, sound absorption core; 400, Tesla valve; 410, through end; 420, blocking end; 430, air passage assembly; 431, first pipeline; 432, second pipeline; 500, baffle; 510, mounting hole; 600, outlet flange. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application. In addition, 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. In the present application, the orientation words such as "upper", "lower", "left", "right" generally refer to the upper, lower, left and right of the device in the actual use or working state, and the specific direction is the direction of the drawing in the drawings.

[0031] The present application provides a resistive sound absorber and a ship, which will be described in detail below. It should be noted that the description order of the following embodiments is not used to limit the preferred order of the embodiments of the present application. In the following embodiments, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0032] Please refer to Figure 1-Figure 3fThe application provides a resistive muffler, which comprises a shell 100, a sound-absorbing core 300 and at least one set of Tesla valves 400, wherein the shell 100 comprises a cavity 110; the sound-absorbing core 300 is filled in the cavity 110, and the sound-absorbing core 300 is surrounded by the side wall of the shell 100 to form an air inlet cavity 111 and an air outlet cavity 112 at two ends of the sound-absorbing core 300 respectively; the Tesla valve 400 is arranged in the sound-absorbing core 300, and the Tesla valve 400 comprises a through end 410, a blocking end 420 and two or more communication holes (not shown in the figure); the through end 410 is one end of the Tesla valve 400 and is communicated with the air outlet cavity 112; the blocking end 420 is the other opposite end of the Tesla valve 400 and is communicated with the air inlet cavity 111; the Tesla valve 400 is provided with the communication holes, and the communication holes are communicated with the cavity 110.

[0033] The Tesla valve 400 is usually used in the valve body of a liquid (such as water) flowing through, and depends on a special loop design to increase the one-way through performance. When the fluid flows into the Tesla valve 400 from the through end 410, the fluid is divided into two paths at each loop port, and then the two paths of fluid converge at the next intersection and achieve acceleration, at this time, the total pressure loss is small. When the fluid flows into the Tesla valve 400 from the blocking end 420, the fluid is also divided into two paths at the first intersection, and converges again at the second intersection, but the flow directions of the two paths of fluid are opposite, so a great resistance is formed, at this time, the total pressure loss is large. Therefore, in the specific application of the Tesla valve 400, the liquid can only pass through in the forward direction, and it is difficult to flow in the reverse direction.

[0034] In the application, the through end 410 of the Tesla valve 400 is communicated with the air outlet cavity 112, and the blocking end 420 is communicated with the air inlet cavity 111, so that the gas can flow from the air inlet cavity 111 to the air outlet cavity 112 through the Tesla valve 400. Since the cavity 110 of the shell 100 is filled with the sound-absorbing core 300, the Tesla valve 400 is arranged in the sound-absorbing core 300, and the Tesla valve 400 is provided with two or more communication holes; when the gas flows in the Tesla valve 400, the sound wave contacts the sound-absorbing core 300 through the communication holes, so as to achieve the purpose of silencing. In the application, the sound-absorbing core 300 can be selected from fiber or porous sound-absorbing materials. In the application, the through end 410 of the Tesla valve 400 is communicated with the air outlet cavity 112, and the blocking end 420 is communicated with the air inlet cavity 111, so when the gas enters the Tesla valve 400, the gas flows through the loop design of the Tesla valve 400. When the gas flows through each loop, the flow directions of the two paths of gas are opposite, so there is a certain pressure loss, which reduces the flow rate of the gas in the Tesla valve 400, so that the sound wave can better contact the sound-absorbing core 300, dissipate more sound wave energy, and improve the silencing coefficient of the resistive muffler.

[0035] The gas flowing in the Tesla valve 400 is stronger than water, and the density of water is much greater than that of gas under the same pressure, so the pressure loss generated by water flowing through the structure of the Tesla valve 400 is much greater than that of gas. Therefore, the reverse application of the Tesla valve 400 in the present application can reduce the pressure loss to a certain extent, and also reduce the flow rate of the gas, so as to balance the improvement of the sound attenuation effect and the control of the pressure loss.

[0036] Because the Tesla valve 400 is specially designed inside the loop, when the gas flows through each loop, the flow distance of the two-way gas is different, forming a phase difference to realize interference sound attenuation; therefore, by controlling the length of the two-way channel, the resonance frequency of the Tesla valve 400 is aligned with the characteristic line spectrum noise, that is, the characteristic line spectrum precise control sound attenuation can be realized.

[0037] Further, each group of Tesla valve 400 includes at least one gas channel assembly 430, each gas channel assembly 430 includes two pipes, one of which has a curvature K1 at the head end and a curvature K2 at the tail end, and 0≤K1 / K2<1. The two head ends belonging to the two pipes are connected, and the two tail ends are connected; the middle parts of the two pipes are isolated by a part of the sound absorption core 300. When each group of Tesla valve 400 includes two or more gas channel assemblies 430, the head end of a first pipe 431 assembly is connected to the tail end of a second pipe 432 assembly or an air inlet cavity 111; the tail end of the first pipe 431 assembly is connected to the head end of a third gas channel assembly 430 or an air outlet cavity 112.

[0038] The gas channel assembly 430 includes two pipes, the two head ends belonging to the two pipes are connected, and the two tail ends are connected, thereby forming a loop inside the Tesla valve 400, and the heads and tails of the plurality of gas channel assemblies 430 are sequentially connected, thereby forming a special loop structure of the Tesla valve 400. One of the two pipes in the above-mentioned gas channel assembly 430 is at least partially bent, by limiting the curvature of the pipe at the head end to be smaller than that at the tail end, when the gas flows from the head end to the tail end of the pipe, the flow direction of the gas flowing out of the pipe is changed due to the larger curvature at the tail end, so that the flow direction of the gas flowing out of the pipe is opposite to that of the other pipe. Although there is a certain pressure loss due to the slight increase in the drag coefficient, the flow rate of the gas inside the Tesla valve is reduced by half, the pressure loss is reduced by four times, and the total pressure loss of the muffler is greatly reduced.

[0039] Furthermore, each air duct component 430 includes a first pipe 431 and a partially bent second pipe 432. The first pipes 431 of more than two air duct components 430 are connected in sequence to form a main passage; the second pipes 432 of any two adjacent air duct components 430 are respectively located on both sides of the main passage; at the same time, connecting holes are opened on the first pipe 431 and the second pipe 432.

[0040] Since each air duct component 430 is composed of a first pipe 431 and a second pipe 432, and the lengths of the first pipe 431 and the second pipe 432 are different. The sound waves and the airflow are diverted at the connection point between the head end of the first pipe 431 and the head end of the second pipe 432. The path of the sound waves in the second pipe 432 is longer. When the sound waves in the second pipe 432 meet the sound waves in the first pipe 431, due to the different distances, there will be a phase difference between the gases flowing through the first pipe 431 and the second pipe 432, thereby achieving the effect of interference noise reduction. Since connecting holes are provided on both the first pipe 431 and the second pipe 432, when the sound waves pass through the connecting holes, they will contact the sound-absorbing core 300 provided outside the pipe and be dissipated. According to the principle of interference noise reduction, the acoustic transmission loss TL of a single air duct component 430 is calculated according to the following formula:

[0041]

[0042] Wherein, S is the cross-sectional area of ​​the main passage, S1 is the cross-sectional area of ​​the first pipe 431, S2 is the cross-sectional area of ​​the second pipe 432, l1 is the pipe length of the first pipe 431, l2 is the pipe length of the second pipe 432, M1 is the Mach number of the airflow in the first pipe 431, and M2 is the Mach number of the airflow in the second pipe 432; k ci =k / (1-M i 2 ), k is the wave number; j is the imaginary number.

[0043] The condition for a single airway component 430 to resonate, i.e., for the transmission loss to be infinite, is:

[0044]

[0045] Wherein, S is the cross-sectional area of ​​the main passage, S1 is the cross-sectional area of ​​the first pipe 431, S2 is the cross-sectional area of ​​the second pipe 432, l1 is the pipe length of the first pipe 431, l2 is the pipe length of the second pipe 432, M1 is the Mach number of the airflow in the first pipe 431, and M2 is the Mach number of the airflow in the second pipe 432; k ci =k / (1-M i 2 ), k is the wave number; j is the imaginary number.

[0046] Furthermore, the cross-sectional area of ​​the first pipe 431 is equal to the cross-sectional area of ​​the second pipe 432, and when the air flow velocity is not considered, then:

[0047] sin(kl1)+sin(kl2)=0

[0048] Wherein, l1 is the pipeline length of the first pipeline 431, l2 is the pipeline length of the second pipeline 432, and k is the wave number.

[0049] We can obtain:

[0050] k(l2-l1)=(2n+1)π

[0051] l2-l1=(2n+1)λ / 2,n=0,1,2,3,…

[0052] Wherein, l1 is the length of the first pipeline 431, l2 is the length of the second pipeline 432, λ is the wavelength, and n is a natural number.

[0053] In summary, the resonant frequency can be obtained according to the following formula:

[0054] f r =[c / (l2-l1)](2n+1) / 2, n=0,1,2,3,…

[0055] Among them, f r is the resonance frequency, c is the speed of sound, n is a natural number, l1 is the length of the first pipe 431 , and l2 is the length of the second pipe 432 .

[0056] According to the above resonant frequency calculation formula, by adjusting the difference between the lengths of first pipe 431 and second pipe 432, the resonant frequency of a single airway component 430 is aligned with the characteristic line spectrum noise, thereby muffling the characteristic line spectrum. Each Tesla valve 400 is formed by multiple airway components 430. If the dimensions of each airway component 430 are completely consistent, the noise of each characteristic line spectrum can be greatly suppressed due to the combined muffling effect.

[0057] Furthermore, the resistive muffler includes two or more groups of Tesla valves 400, each of which is arranged in a linear array with equal spacing. By arranging multiple Tesla valves 400, different characteristic line spectra can be achieved. By effectively combining the narrow-band muffler curves of each Tesla valve 400, the interference muffler effect can be superimposed, increasing the muffler amplitude and achieving broadband low-frequency muffler. Furthermore, the arrayed Tesla valves 400 can reduce the cross-sectional area of ​​a single Tesla structure channel while maintaining the airflow area, resulting in a higher cutoff frequency for the muffler and resolving the high-frequency failure issue.

[0058] Further, the first pipe 431 is a straight pipe, and in each main passage, the center axes of any two adjacent first pipes 431 form an included angle, and the included angle is an obtuse angle. The center axes of the two adjacent first pipes 431 form an obtuse angle, which further improves the noise reduction effect of the muffler. When the sound wave passes through the connection between the two first pipes 431, it cannot pass straight through, so the sound wave energy can be better dissipated, and the noise reduction coefficient of the entire structure is improved. At the same time, the center axes of the two adjacent first pipes 431 form an obtuse angle, which can reduce the pressure loss of the muffler.

[0059] Further, the second pipe 432 includes a straight pipe and an arc-shaped pipe, and the tail end of the straight pipe is in communication with the head end of the arc-shaped pipe, and the ratio of the arc length of the arc-shaped pipe to the length of the second pipe 432 ranges from 0 to 1 / 2. The combination of the straight pipe and the arc-shaped pipe can change the direction of the airflow and slow down the flow rate of the airflow. At the same time, when the airflow flows through the straight pipe to the arc-shaped pipe, the sound wave bends towards the wall of the arc-shaped pipe, so that it can better contact the sound-absorbing core 300, and the common high-frequency failure of the resistive muffler is better inhibited.

[0060] In the present application, the combination of the first pipe 431 and the second pipe 432 is used to split the airflow, which can increase the area of the airflow and reduce the speed of the airflow, thereby helping to control the pressure loss of the muffler. The Tesla valve 400 formed by connecting multiple air duct assemblies 430 can control the noise characteristic spectrum, thereby having a positive effect on reducing the airflow regeneration noise and pressure loss of the muffler. In addition, the center axes of the two adjacent first pipes 431 form an obtuse angle to increase the effect of airflow splitting, so that the energy of the sound wave transmitted to the first pipe 431 and the second pipe 432 is relatively uniform, and the sound wave energy value generated by the second pipe 432 outlet is not much smaller than that of the first pipe 431 outlet, which can improve the effect of interference noise reduction. In addition, the noise reduction coefficient of the resistive material of this structure is also greatly improved in the full frequency band, finally realizing the low-frequency broadband noise reduction effect of the resistive muffler, and meeting the use requirements of high noise reduction in each frequency band in engineering.

[0061] According to Figure 3a-3fUnder normal temperature conditions, when the sound velocity is 340 m / s, using the first resonance peak for superposition, the pipe length difference corresponding to a 63Hz muffler frequency is 2.70m, 80Hz is 2.125m, 100Hz is 1.70m, 125Hz is 1.36m, 160Hz is 1.0625m, 200Hz is 0.85m, and 250Hz is 0.68m. Assuming the length of second pipe 432 is 1m, and the lengths of first pipe 431 are 3.7m, 3.125m, 2.70m, 2.36m, 1.85m, and 1.68m, respectively, the corresponding resonance muffler frequencies are 63Hz, 80Hz, 100Hz, 125Hz, 200Hz, and 250Hz, respectively. The transmission loss curve of the interference silencing of Tesla valve 400 in the frequency range of 1Hz-300Hz is as follows Figure 3a-3f As shown in the figure, multiple resonance peaks are generated at each pipe length difference, and the muffler has higher transmission loss at the resonance peak position. If different pipe length differences are used to obtain different resonance frequencies, the muffler effect will be superimposed on each other, achieving the effect of low-frequency broadband muffler and characteristic line spectrum elimination.

[0062] To control pressure loss, the Tesla valve array 400 further increases the gas flow area while minimizing the cross-sectional area of ​​a single pipe. Furthermore, the central axes of adjacent first pipes 431 form an obtuse angle, allowing for a smooth transition of airflow at the junction of the two first pipes 431. After entering the Tesla valve 400, the airflow is split between the first pipe 431 and the second pipe 432, further increasing the airflow area and ultimately controlling muffler pressure loss.

[0063] Furthermore, the resistive muffler also includes an inlet flange 200 and an outlet flange 600. The inlet flange 200 is connected to one end of the housing 100 and communicates with the air inlet chamber 111; the outlet flange 600 is connected to the other end of the housing 100 and communicates with the air outlet chamber 112. By providing the inlet flange 200 and the outlet flange 600 at both ends of the muffler, it is convenient to connect the muffler to the upstream and downstream pipelines, thereby facilitating installation and maintenance.

[0064] Furthermore, the side walls of the shell 100 that enclose the air inlet cavity 111 are tapered, and their cross-sectional area gradually increases along the direction from the air inlet cavity 111 to the air outlet cavity 112; the side walls of the shell 100 that enclose the air outlet cavity 112 are tapered, and their cross-sectional area gradually decreases along the direction from the air inlet cavity 111 to the air outlet cavity 112. By limiting the side walls of the shell 100 that enclose the air inlet cavity 111 and the air outlet cavity 112 to be tapered, the mass and volume of the shell 100 can be reduced while ensuring the design requirements of the cavity 110, thereby achieving a lightweight and miniaturized design. At the same time, along the direction from the air inlet cavity 111 to the air outlet cavity 112, the cross-sectional area of ​​the side walls of the shell 100 that enclose the air inlet cavity 111 gradually increases, and the cross-sectional area of ​​the side walls that enclose the air outlet cavity 112 gradually decreases, so that the cross-sectional area of ​​the central region of the shell 100 is the largest, which is conducive to reducing the flow rate of the air flow in the cavity 110 and improving the sound absorption effect. In the present application, the sidewalls of the shell 100 forming the air inlet cavity 111 may be conical, or circle-to-square, or square-to-circle, and the sidewalls of the shell 100 forming the air outlet cavity 112 may be conical, or circle-to-square, or square-to-circle.

[0065] Furthermore, the sound-absorbing core 300 includes at least one insertion hole, each of which is penetrated by a Tesla valve 400. The exterior of the Tesla valve 400 is covered with a protective layer, the outer wall of which adheres to the wall of the through hole. In this application, the protective layer can be made of alkali-free glass. The outer wall of the protective layer adheres to the wall of the through hole, helping to fix the position of the sound-absorbing core 300 and protect it from being moved by airflow.

[0066] Furthermore, the resistive muffler includes two baffles 500, which are arranged parallel to each other within the cavity 110. The sidewall of each baffle 500 is affixed to the inner wall of the cavity 110, and one end surface of the baffle 500 abuts against the sound-absorbing core 300. Each baffle 500 has at least one mounting hole 510. The mounting hole 510 of one baffle 500 is connected to the conducting end 410, while the mounting hole 510 of the other baffle 500 is connected to the blocking end 420.

[0067] In other embodiments of the present application, a ship is disclosed, which includes all the technical features of the resistive muffler in the above-mentioned solution.

[0068] The above is a detailed introduction to the resistive silencer and ship provided in this application. Specific examples are used in this article to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method of this application and its core idea. At the same time, for general technical personnel in this field, based on the ideas of this 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 a limitation on this application.

Claims

1. A resistive muffler, characterized in that: include: a housing (100) comprising a cavity (110); A sound-absorbing core (300) is filled in the cavity (110), and two ends of the sound-absorbing core (300) and the side walls of the shell (100) respectively form an air inlet cavity (111) and an air outlet cavity (112); as well as At least one set of Tesla valves (400) is inserted into the sound absorbing core (300), wherein the Tesla valves (400) include: A conducting end (410), which is one end of the Tesla valve (400) and is connected to the air outlet cavity (112); a blocking end (420), which is the other end of the Tesla valve (400) and is connected to the air inlet chamber (111); and Two or more communication holes are provided on the Tesla valve (400) and are connected to the cavity (110); At least one airway component (430), each of the airway components (430) comprising two pipes, wherein the curvature at the head end of one of the pipes is K1, the curvature at the tail end thereof is K2, and 0≤K1 / K2<1; The two head ends of the two pipelines are connected, and the two tail ends are connected.

2. The resistive muffler according to claim 1, characterized in that: The middle parts of the two pipes are isolated by a portion of the sound absorbing core (300); When each group of the Tesla valves (400) includes two or more of the airway components (430), the head end of a first pipe (431) component is connected to the tail end of a second pipe (432) component or the air inlet cavity (111); the tail end of the first pipe (431) component is connected to the head end of a third airway component (430) or the air outlet cavity (112).

3. The resistive muffler according to claim 2, characterized in that: Each of the airway components (430) comprises: A first pipe (431), wherein the first pipes (431) of two or more airway assemblies (430) are connected in sequence to form a main passage; and a partially curved second pipe (432), wherein the second pipes (432) of any two adjacent airway components (430) are respectively located on both sides of the main passage; The communicating hole is provided on both the first pipe (431) and the second pipe (432).

4. The resistive muffler according to claim 3, characterized in that: The first pipe (431) is a straight pipe. In each of the main passages, the central axes of any two adjacent first pipes (431) form an angle, which is an obtuse angle.

5. The resistive muffler according to claim 3, characterized in that: The second pipe (432) includes a straight pipe and an arc-shaped pipe, and the tail end of the straight pipe is connected to the head end of the arc-shaped pipe. The ratio of the arc length of the arc-shaped pipe to the length of the second pipe (432) ranges from 0 to 1.

6. The resistive muffler according to claim 3, characterized in that The cross-sectional area of ​​the first pipe (431) is equal to or proportional to the cross-sectional area of ​​the second pipe (432).

7. The resistive muffler according to claim 1, characterized in that The resistive muffler comprises two or more groups of Tesla valves (400), and the Tesla valves (400) are arranged in a linear array with equal spacing.

8. The resistive muffler according to claim 1, characterized in that Also includes: an inlet flange (200) connected to one end of the housing (100) and communicating with the air inlet cavity (111); as well as An outlet flange (600) is connected to the other end of the housing (100) and communicates with the air outlet cavity (112).

9. The resistive muffler according to claim 1, characterized in that The side wall of the housing (100) surrounding the air inlet cavity (111) is tapered, and its cross-sectional area gradually increases along the direction from the air inlet cavity (111) to the air outlet cavity (112); The side wall of the housing (100) surrounding the air outlet cavity (112) is tapered, and its cross-sectional area gradually decreases along the direction from the air inlet cavity (111) to the air outlet cavity (112).

10. The resistive muffler according to claim 1, characterized in that The sound absorbing core (300) includes at least one insertion hole, and a Tesla valve (400) is inserted into each of the insertion holes; The exterior of the Tesla valve (400) is covered with a protective layer, and the outer sidewall of the protective layer is adhered to the hole wall of the through hole.

11. The resistive muffler according to claim 1, characterized in that Also includes: Two baffles (500) are arranged in parallel in the cavity (110), the side walls of the baffles (500) are attached to the inner wall of the cavity (110), and one end surface thereof abuts against the sound-absorbing core (300); Any of the baffles (500) is provided with at least one mounting hole (510); the mounting hole (510) of one baffle (500) is connected to the conducting end (410), and the mounting hole (510) of the other baffle (500) is connected to the blocking end (420).

12. A ship, characterized in that: The invention comprises the resistive muffler according to any one of claims 1 to 11.

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