Engine muffler

Abstract

The present invention provides an engine muffler, which comprises: a shell having a cavity; a muffler structure arranged in the cavity, the muffler structure comprising a muffler pipe and a partition, the muffler pipe having an inlet and an outlet arranged relatively, the inlet and the outlet being respectively connected to the outside, the partition being sleeved on the outer circumference of the muffler pipe to form the cavity into two mutually independent first and second resonance cavities, the muffler pipe being inserted in the first and second resonance cavities, the muffler pipe being respectively connected to the first and second resonance cavities; an elastic pipe being arranged in the second resonance cavity, the elastic pipe being sleeved on the outer circumference of part of the muffler pipe, there being a gap between the elastic pipe and the muffler pipe, the elastic pipe being able to couple with the noise to reduce the noise. The technical solution provided by the present invention can solve the problem that the muffler in the prior art has a relatively single noise reduction effect and is not suitable for reducing the noise of the engine.

Description

Technical Field

[0001] The present invention relates to the technical field of engine noise reduction, and in particular to an engine muffler. Background Art

[0002] The engine generates a lot of noise when it is working. A muffler is usually provided in the exhaust system of the engine to reduce the noise generated when the engine is running.

[0003] The exhaust port of a mining truck engine is close to the cab. Due to the installation conditions, the exhaust muffler of a mining engine is often compact in size, which will cause the air flow velocity inside the muffler to reach more than 60m / s. If sound-absorbing materials are laid inside the muffler, the sound-absorbing materials will be quickly consumed under the long-term erosion and suction of the high-speed airflow, and the muffler's sound-absorbing performance will gradually decrease. Not only is the noise reduction cost high, but the sound-absorbing effect is also relatively simple. Due to the size limitations in the radial direction of the muffler, it is also difficult to lay a certain thickness of sound-absorbing material inside. Summary of the invention

[0004] The present invention provides an engine muffler to solve the problem that the muffler in the prior art has a relatively single noise reduction effect and is not suitable for reducing the noise of the engine.

[0005] The invention provides an engine silencer, which comprises: a shell having a cavity; a silencer structure arranged in the cavity, the silencer structure comprising a silencer pipe and a partition, the silencer pipe having an inlet and an outlet arranged opposite to each other, the inlet and the outlet being respectively communicated with the outside, the partition being sleeved on the outer circumference of the silencer pipe to form the cavity into two mutually independent first resonance cavities and second resonance cavities, the silencer pipe being passed through the first resonance cavity and the second resonance cavity, the silencer pipe being respectively communicated with the first resonance cavity and the second resonance cavity; an elastic pipe being arranged in the second resonance cavity, the elastic pipe being sleeved on the outer circumference of a part of the silencer pipe, a gap being provided between the elastic pipe and the silencer pipe, the elastic pipe being able to produce a coupling effect with the noise to reduce the noise.

[0006] Furthermore, the silencer includes a first section and a second section which are arranged in sequence, the first section is arranged in the first resonance cavity, the second section passes through the second resonance cavity, the first section and the second section are arranged at intervals, and part of the first section is sleeved on the outer circumference of the second section.

[0007] Furthermore, the first section includes: an air intake pipe having an inlet; an interference cover, one side of the interference cover is covered on an end of the air intake pipe away from the inlet, and the other side of the interference cover is covered on the outer periphery of the end of the second section close to the inlet, and a plurality of first flow holes are provided on the side of the interference cover facing the inlet, the first flow holes are provided corresponding to the air intake pipe, and there is a gap between the interference cover and the second section along the flow direction of the noise.

[0008] Furthermore, a plurality of second flow holes are arranged on the side wall of the intake pipe, and the plurality of second flow holes are arranged on the outer side wall of the intake pipe at intervals along the circumferential direction of the intake pipe, and the intake pipe is connected with the first resonance cavity through the second flow holes.

[0009] Furthermore, the second section has an intermediate pipe and an air outlet pipe connected in sequence, the air outlet pipe has an outlet, the intermediate pipe is located in the first resonance cavity, the air outlet pipe is located in the second resonance cavity, and the interference cover is arranged on the outer periphery of part of the intermediate pipe.

[0010] Furthermore, a plurality of third flow holes are arranged on the side wall of the air outlet pipe, and the plurality of third flow holes are distributed at intervals along the circumference of the air outlet pipe.

[0011] Further, the porosity of the air inlet pipe is a, the porosity of the interference cover is b, and the porosity of the air outlet pipe is c, wherein 25%≤a≤40%, 10%≤b≤25%, and 5%≤c≤8%.

[0012] Further, the diameter of the first circulation hole is A, the diameter of the second circulation hole is B, and the diameter of the third circulation hole is C, wherein 4mm≤A≤5mm, 2mm≤B≤3mm, and 1mm≤C≤2mm.

[0013] Furthermore, the engine muffler device also includes an outer tube, which is located in the first resonance cavity and is covered on the outer periphery of the first section and the second section, and a plurality of fourth flow holes are arranged on the side wall of the outer tube.

[0014] Furthermore, the air outlet pipe has a tapered section, and the diameter of the tapered section gradually increases in a direction away from the middle pipe.

[0015] By applying the technical solution of the present invention, the cooperation of the silencer pipe and the partition can form multiple resonance cavities in the shell. By adjusting the size of the resonance cavity, the center frequency of the resonance cavity can be adjusted so that the air in the resonance cavity resonates, thereby consuming the energy of the noise to reduce the noise. The above design can increase the noise reduction frequency of the device to adapt to the noise reduction requirements of different environments and working conditions, and improve the practicality and flexibility of the noise reduction of the device. At the same time, the multi-order peak noise is eliminated through the acoustic-solid coupling between the sound wave and the elastic tube, which plays a role in flattening the trough of the sound wave, further improving the noise reduction effect of the silencer. Compared with the use of sound-absorbing materials for noise reduction, the silencer pipe and the partition are not easy to age, do not need to be replaced frequently, and the later maintenance cost is low. At the same time, the above structures are all integrated in a shell, the space volume is small, and it will not affect the layout of other components in the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0017] Figure 1 The schematic diagram of the structure of the engine muffler provided by the present invention is shown.

[0018] The above drawings include the following reference numerals:

[0019] 10. Shell;

[0020] 101. Cavity;

[0021] 1011. The first resonant cavity;

[0022] 1012, second resonance cavity;

[0023] 21. Silencer;

[0024] 210. Entrance;

[0025] 211. Export;

[0026] 212, first paragraph;

[0027] 2121, intake pipe;

[0028] 2122, interference cover;

[0029] 2123, first flow hole;

[0030] 2124, second flow hole;

[0031] 213, second paragraph;

[0032] 2131, intermediate tube;

[0033] 2132, exhaust pipe;

[0034] 2133, third flow hole;

[0035] 22. Partition;

[0036] 30. Elastic tube;

[0037] 40. External control;

[0038] 401, fourth flow hole;

[0039] 51. Inlet flange;

[0040] 52. Exhaust flange. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] like Figure 1 As shown, an embodiment of the present invention provides an engine muffler device, which includes: a shell 10, a muffler structure and an elastic tube 30. The shell 10 has a cavity 101. The muffler structure is arranged in the cavity 101, and the muffler structure includes a muffler pipe 21 and a partition 22. The muffler pipe 21 has an inlet 210 and an outlet 211 arranged opposite to each other, and the inlet 210 and the outlet 211 are respectively connected to the outside. The partition 22 is sleeved on the outer periphery of the muffler pipe 21 to form the cavity 101 into two independent first resonance cavities 1011 and second resonance cavities 1012. The muffler pipe 21 is inserted into the first resonance cavity 1011 and the second resonance cavity 1012, and the muffler pipe 21 is respectively connected to the first resonance cavity 1011 and the second resonance cavity 1012. The elastic tube 30 is arranged in the second resonance cavity 1012, and the elastic tube 30 is sleeved on the outer periphery of a part of the muffler tube 21. There is a gap between the elastic tube 30 and the muffler tube 21, and the elastic tube 30 can produce a coupling effect with the noise to reduce the noise. At the same time, the above structures are all integrated in a shell, the space volume is small, and it will not affect the layout of other components in the system. Among them, the elastic tube 30 can be made of rubber and other materials.

[0043] By applying the technical solution of the present invention, the cooperation of the silencer pipe 21 and the partition plate 22 can form a first resonance cavity 1011 and a second resonance cavity 1012 in the shell 10. By adjusting the size of the resonance cavity, the center frequency of the resonance cavity can be adjusted so that the air in the resonance cavity resonates, thereby consuming the energy of the noise to reduce the noise. The above design can expand the range of the noise reduction frequency of the device to meet the noise reduction requirements of different environments and working conditions, thereby improving the practicality and flexibility of the noise reduction of the device. At the same time, the multi-order peak noise is eliminated through the acoustic-solid coupling between the sound wave and the elastic tube 30, which plays a role in flattening the trough of the sound wave, further improving the noise reduction effect of the silencer. Compared with the use of sound-absorbing materials for noise reduction, the silencer pipe and the partition plate are not easy to age, do not need to be replaced frequently, and have low maintenance costs in the later stage.

[0044] Furthermore, the silencer pipe 21 includes a first section 212 and a second section 213 which are arranged in sequence, the first section 212 is arranged in the first resonance cavity 1011, the second section 213 is arranged in the second resonance cavity 1012, the first section 212 and the second section 213 are arranged at intervals, and part of the first section 212 is sleeved on the outer periphery of the second section 213. Through the above arrangement, after the noise flows out of the first section 212, it will enter the first resonance cavity 1011 to generate resonance, and then the remaining sound waves will return to the gap between the first section 212 and the second section 213 again, and will interfere with the noise sound waves in the first section 212 to further reduce noise, and then enter the second section 213. The above design can further optimize the propagation path of the noise and improve the silencing effect of the device.

[0045] The first section 212 includes: an air intake pipe 2121 and an interference cover 2122, and the air intake pipe 2121 has an inlet 210. One side of the interference cover 2122 is covered at one end of the air intake pipe 2121 away from the inlet 210, and the other side of the interference cover 2122 is covered at the periphery of the end of the second section 213 close to the inlet 210. The interference cover 2122 is provided with a plurality of first flow holes 2123 on the side facing the inlet 210, and the first flow holes 2123 are provided corresponding to the air intake pipe 2121, and there is a gap between the interference cover 2122 and the second section 213 along the flow direction of the noise. Through the above arrangement, the interference cover 2122 can increase the distance between the first section 212 and the second section 213, and enhance the interference effect of the noise sound waves. At the same time, the interference cover 2122 can also reduce the flow rate of the noise in the air intake pipe 2121, thereby reducing the noise generated by the high-speed flow and between the components.

[0046] Specifically, a plurality of second flow holes 2124 are provided on the side wall of the air intake pipe 2121, and the plurality of second flow holes 2124 are arranged at intervals along the circumference of the air intake pipe 2121 on the outer side wall of the air intake pipe 2121, and the air intake pipe 2121 is connected to the first resonance cavity 1011 through the second flow holes 2124. The second flow holes 2124 can effectively guide the sound waves entering the air intake pipe 2121 to the first resonance cavity 1011. The first resonance cavity 1011 is formed by the second flow holes 2124 and the shell 10, which can increase the attenuation effect of noise. The silencing frequency of the first resonance cavity 1011 can be changed by changing the number or aperture of the second flow holes 2124. The Helmholtz resonance principle is utilized, and by adjusting the size and position of the holes, it can be optimized for different frequency bands, achieving a wider range of silencing effects, and improving the flexibility of noise reduction of the first resonance cavity 1011.

[0047] At the same time, the second flow hole 2124 can also reduce the resistance of the airflow passing through, avoid increasing the exhaust back pressure due to excessive resistance, affect the performance of the engine, optimize the pressure loss characteristics of the muffler, and ensure a good muffler effect with low pressure loss.

[0048] Furthermore, the second section 213 has an intermediate pipe 2131 and an air outlet pipe 2132 connected in sequence, the air outlet pipe 2132 has an outlet 211, the intermediate pipe 2131 is located in the first resonance cavity 1011, the air outlet pipe 2132 is located in the second resonance cavity 1012, and the interference cover 2122 is arranged on the outer periphery of part of the intermediate pipe 2131. The design of the second resonance cavity 1012 is also based on the Helmholtz resonance principle, which can reduce the remaining noise. At the same time, the interference cover 2122 is arranged on the outer periphery of part of the intermediate pipe 2131, which can promote the airflow to form a complex sound wave path between the intermediate pipe 2131 and the interference cover 2122, increase the number of reflections and path length of the sound wave, make the phase difference of the sound wave on different paths more obvious, and thus produce a better sound elimination effect at the outlet of the air outlet pipe 2132.

[0049] Specifically, a plurality of third flow holes 2133 are provided on the side wall of the outlet pipe 2132, and the plurality of third flow holes 2133 are distributed at intervals along the circumference of the outlet pipe 2132. The third flow holes 2133 enable part of the sound waves to flow out from the side wall of the outlet pipe 2132 and enter the second resonance cavity 1012 for silencer. At the same time, the flow holes on the side wall of the outlet pipe can alleviate the pressure fluctuations generated during the exhaust process. When high-speed airflow passes through the outlet pipe, local high-pressure areas may be formed in the pipe. These high-pressure areas will increase the exhaust back pressure and affect the efficiency and performance of the engine. The third flow holes 2133 can serve as a pressure release channel to help balance the pressure in the pipe, reduce the back pressure, and ensure that the entire silencer operates under low pressure loss conditions.

[0050] Furthermore, the porosity of the air inlet pipe 2121 is a, the porosity of the interference cover 2122 is b, and the porosity of the air outlet pipe 2132 is c, wherein 25%≤a≤40%, 10%≤b≤25%, and 5%≤c≤8%. By precisely controlling the porosity of the above components, noises of different frequencies can be effectively attenuated.

[0051] Specifically, the diameter of the first flow hole 2123 is A, the diameter of the second flow hole 2124 is B, and the diameter of the third flow hole 2133 is C, wherein 4mm≤A≤5mm, 2mm≤B≤3mm, and 1mm≤C≤2mm. By controlling the diameter of the flow holes, the noise attenuation effect can be optimized, and noises of different frequencies can be effectively attenuated.

[0052] Through the above configuration, in the present application, the thickness and material of the above components are the same, and the effect of eliminating noises of different frequencies can be achieved by adjusting the number and diameter of the through holes on the silencer pipe 21. The holes on the air inlet pipe 2121 can eliminate medium and high frequency noises, the holes on the interference cover 2122 can eliminate medium and low frequency noises, and the holes on the air outlet pipe 2132 can weaken low frequency noises.

[0053] Furthermore, the engine muffler device further includes an outer tube 40, which is located in the first resonance cavity 1011 and is covered on the outer periphery of the first section 212 and the second section 213, and a plurality of fourth flow holes 401 are provided on the side wall of the outer tube 40. The addition of the outer tube 40 can enhance the structural strength of the entire device, and further disperse the noise through the fourth flow holes 401, thereby significantly enhancing the structural stability and environmental adaptability of the muffler device.

[0054] Specifically, the porosity of the outer tube 40 is d, 30%≤d≤35%, the diameter of the fourth flow hole 401 is D, 3mm≤D≤4mm, and the outer tube 40 cooperates with the shell 10 to weaken high-frequency noise.

[0055] The outlet pipe 2132 has a tapered section, the diameter of which gradually increases from the direction away from the middle pipe 2131. The tapered section can effectively improve the airflow distribution during exhaust, reduce the friction between the airflow and the pipe wall, and thus reduce the exhaust noise.

[0056] The air inlet pipe 2121 is connected to the exhaust pipe of the engine through the air inlet flange 51 , and the air outlet pipe 2132 is connected to the exhaust pipe of the engine through the air outlet flange 52 .

[0057] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0058] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0059] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0060] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0061] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0062] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An engine muffler, characterized in that: The engine muffler device comprises: A housing (10) having a cavity (101); A sound-absorbing structure is arranged in the cavity (101), the sound-absorbing structure comprising a sound-absorbing pipe (21) and a partition (22), the sound-absorbing pipe (21) having an inlet (210) and an outlet (211) arranged opposite to each other, the inlet (210) and the outlet (211) being respectively connected to the outside, the partition (22) being sleeved on the outer circumference of the sound-absorbing pipe (21) so as to form the cavity (101) into two mutually independent first resonance cavities (1011) and second resonance cavities (1012), the sound-absorbing pipe (21) being arranged in the first resonance cavity (1011) and the second resonance cavity (1012), and the sound-absorbing pipe (21) being respectively connected to the first resonance cavity (1011) and the second resonance cavity (1012); An elastic tube (30) is arranged in the second resonance cavity (1012); the elastic tube (30) is sleeved on the outer circumference of a portion of the muffler tube (21); there is a gap between the elastic tube (30) and the muffler tube (21); the elastic tube (30) can produce a coupling effect with the noise to reduce the noise.

2. The engine muffler device according to claim 1, characterized in that: The silencer pipe (21) comprises a first section (212) and a second section (213) which are arranged in sequence, wherein the first section (212) is arranged in the first resonance cavity (1011), and the second section (213) passes through the second resonance cavity (1012), the first section (212) and the second section (213) are arranged at intervals, and a portion of the first section (212) is sleeved on the outer circumference of the second section (213).

3. The engine muffler device according to claim 2, characterized in that: The first section (212) includes: An air inlet pipe (2121) having the inlet (210); An interference cover (2122), one side of the interference cover (2122) is covered on one end of the air intake pipe (2121) away from the inlet (210), and the other side of the interference cover (2122) is covered on the outer periphery of the end of the second section (213) close to the inlet (210), and a plurality of first flow holes (2123) are provided on the side of the interference cover (2122) facing the inlet (210), and the first flow holes (2123) are provided corresponding to the air intake pipe (2121), and a gap is provided between the interference cover (2122) and the second section (213) along the flow direction of the noise.

4. The engine muffler device according to claim 3, characterized in that: A plurality of second flow holes (2124) are arranged on the side wall of the air intake pipe (2121); the plurality of second flow holes (2124) are arranged on the outer side wall of the air intake pipe (2121) at intervals along the circumference of the air intake pipe (2121); and the air intake pipe (2121) is connected to the first resonance cavity (1011) through the second flow holes (2124).

5. The engine muffler device according to claim 4, characterized in that: The second section (213) has an intermediate tube (2131) and an air outlet tube (2132) which are connected in sequence, the air outlet tube (2132) has the outlet (211), the intermediate tube (2131) is located in the first resonance cavity (1011), the air outlet tube (2132) is located in the second resonance cavity (1012), and the interference cover (2122) is arranged on the outer periphery of a portion of the intermediate tube (2131).

6. The engine muffler device according to claim 5, characterized in that: A plurality of third flow holes (2133) are provided on the side wall of the air outlet pipe (2132), and the plurality of third flow holes (2133) are distributed at intervals along the circumference of the air outlet pipe (2132).

7. The engine muffler device according to claim 5, characterized in that: The porosity of the air inlet pipe (2121) is a, the porosity of the interference cover (2122) is b, and the porosity of the air outlet pipe (2132) is c, wherein 25%≤a≤40%, 10%≤b≤25%, and 5%≤c≤8%.

8. The engine muffler device according to claim 6, characterized in that: The diameter of the first circulation hole (2123) is A, the diameter of the second circulation hole (2124) is B, and the diameter of the third circulation hole (2133) is C, wherein 4mm≤A≤5mm, 2mm≤B≤3mm, and 1mm≤C≤2mm.

9. The engine muffler device according to claim 2, characterized in that: The engine muffler device also includes an outer tube (40), the outer tube (40) being located in the first resonance cavity (1011) and being covered on the outer periphery of the first section (212) and the second section (213), and a plurality of fourth flow holes (401) being provided on the side wall of the outer tube (40).

10. The engine muffler device according to claim 5, characterized in that: The air outlet pipe (2132) has a tapered section, and the diameter of the tapered section gradually increases in a direction away from the intermediate pipe (2131).

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