General gasoline engine silencer, engine exhaust system and general gasoline engine

Abstract

The utility model discloses a general gasoline engine silencer, an engine exhaust system and a general gasoline engine, the general gasoline engine silencer comprises a silencer shell with an expansion cavity and a silencing structure arranged in the silencer shell, the silencing structure comprises at least one resistance silencing unit, a sealing plate is arranged in the silencer shell in the radial direction, and the resistance silencing unit is arranged in the silencer shell. The sealing plate divides the expansion cavity into a first cavity and a second cavity, a first mounting through hole is formed in the middle of the sealing plate, the silencing structure is mounted in the first mounting through hole, and the two ends of the silencing structure are embedded into the first cavity and the second cavity respectively and communicate the first cavity with the second cavity. According to the silencer, the silencing performance of the silencer of the general gasoline engine can be effectively improved on the premise that the installation space of the silencer is not increased.

Description

Technical Field

[0001] The present application belongs to the technical field of mufflers, and in particular relates to a general-purpose muffler, an engine exhaust system, and a general-purpose engine. Background Art

[0002] In modern society, science and technology are advancing rapidly, with numerous inventions and discoveries emerging one after another, and people's living standards are constantly improving. While people continue to enjoy the modern material civilization brought about by advanced technology, they also have to endure the environmental pollution it brings. Among these pollutions, noise pollution is the most serious and has the widest impact. At the very least, noise pollution affects normal human production and life, and at the worst, it endangers human health.

[0003] For general-purpose mufflers, under the premise of ensuring that the installation space of the muffler does not increase, in order to find a method that can maximize the muffler's sound attenuation and improve its frequency characteristics so that it can better eliminate the noise of the intake system, designing a muffler internal structure with excellent performance is an effective measure to reduce the noise of the intake and exhaust systems.

[0004] Resistant mufflers perform well in the low and medium frequency range (below 2000Hz), so they are often used in general engine mufflers. Figure 1 As shown in the figure, the resistive silencer is composed of various resistive silencer units such as expansion chamber and resonance chamber through pipes, partitions and other components inside. It uses the structural changes encountered when sound waves are transmitted, such as sudden changes in cross-section or connecting resonance cavities, to reflect and interfere with sound waves to effectively reduce noise.

[0005] Therefore, how to effectively improve the noise reduction performance of the general-purpose muffler while ensuring that the installation space of the muffler does not increase is a problem that needs to be solved urgently in this field. Utility Model Content

[0006] In view of the defects in the prior art, the purpose of this application is to provide a general-purpose muffler, an engine exhaust system and a general-purpose engine, which can effectively improve the noise reduction performance of the general-purpose muffler while ensuring that the installation space of the muffler is not increased.

[0007] In order to achieve the above objectives, this application provides the following solutions:

[0008] According to a first aspect of the present application, the present application provides a general-purpose muffler, comprising a muffler housing having an expansion chamber and a muffler structure disposed in the muffler housing, wherein the muffler structure comprises at least one reactive muffler unit, wherein:

[0009] A sealing plate is radially arranged inside the muffler shell, and the sealing plate divides the expansion chamber into a first chamber and a second chamber. A first mounting through hole is opened in the middle of the sealing plate, and the muffler structure is installed in the first mounting through hole. The two ends of the muffler structure are respectively embedded in the first chamber and the second chamber to connect the first chamber and the second chamber.

[0010] Preferably, the resistive silencer unit includes an inner tube arranged along the axial direction of the silencer, and a silencer baffle is provided at the air outlet end of the inner tube, and the silencer baffle and the inner tube form a resonance chamber, and a second mounting through hole and an air vent are provided on the silencer baffle, and the air vent is used to connect the first chamber and the second chamber, and a ventilation pipe is provided through the second mounting through hole, and the ventilation pipe is used to connect the first chamber and the second chamber.

[0011] Preferably, the muffler structure comprises a plurality of reactive muffler units, each reactive muffler unit is arranged in series along the axial direction of the muffler, and two adjacent reactive muffler units are fixedly connected.

[0012] Preferably, the air inlet end of the inner tube of the latter resistive silencer unit is sealed and connected to the air outlet end of the inner tube of the former resistive silencer unit by welding.

[0013] Preferably, the number of the reactive silencer units is an odd number, and the outer wall of the inner tube of the reactive silencer unit located in the middle is sealed and connected to the inner wall of the first mounting through hole.

[0014] Preferably, the air inlet end of the vent pipe extends into the resonance chamber, and the air outlet end of the vent pipe is protruding relative to the air outlet side of the sound-absorbing baffle.

[0015] Preferably, the muffler shell includes an outer tube, an air inlet pipe, an air outlet pipe, a first outer sealing plate and a second outer sealing plate. The diameters of the air inlet pipe and the air outlet pipe are the same and are both smaller than the diameter of the outer tube. One end of the outer tube is connected to the air inlet pipe through the first outer sealing plate, and the other end of the outer tube is connected to the air outlet pipe through the second outer sealing plate. The first outer sealing plate, the outer tube and the second outer sealing plate form the expansion chamber.

[0016] Preferably, the air outlet end of the air inlet pipe extends into the first chamber, and the air inlet pipe of the air outlet pipe extends into the second chamber.

[0017] According to a second aspect of the present application, the present application provides an engine exhaust system, comprising the general-purpose muffler as described in any one of the first aspects above.

[0018] According to the third aspect of the present application, the present application provides a general engine, including the engine exhaust system described in the second aspect above.

[0019] Due to the adoption of the above technical solution, this application has the following beneficial effects:

[0020] Based on the existing technology, the present application provides a sealing plate radially in a muffler housing having an expansion chamber, the expansion chamber is divided into a first chamber and a second chamber by the sealing plate, and a first mounting hole is opened in the middle of the sealing plate, a muffler structure having at least one resistive muffler unit is installed in the first mounting hole, and the two ends of the muffler structure are respectively embedded in the first chamber and the second chamber and connect the first chamber and the second chamber, thereby effectively improving the muffler performance of the general machine muffler while ensuring that the installation space of the muffler is not increased.

[0021] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific embodiments of this application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the various elements or parts are not necessarily drawn according to the actual scale. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without inventive effort.

[0023] Figure 1 This is a schematic diagram of the cross-sectional structure of an existing general-purpose muffler;

[0024] Figure 2 This is a schematic diagram of the three-dimensional structure of a general-purpose muffler in one embodiment of the present application;

[0025] Figure 3 yes Figure 2 The main view;

[0026] Figure 4 yes Figure 3 AA section view;

[0027] Figure 5 yes Figure 2 A three-dimensional cross-sectional view of

[0028] Figure 6 yes Figure 1 The sound pressure cloud diagram of the existing general engine muffler shown;

[0029] Figure 7 yes Figure 5 The sound pressure cloud diagram of the general muffler in the embodiment of the present application is shown;

[0030] Figure 8 yes Figure 5 The muffler of the present application embodiment is shown in FIG. Figure 1 The figure shows a comparison of the outlet response characteristic curves of existing general-purpose mufflers. DETAILED DESCRIPTION

[0031] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0032] It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those skilled in the art in the art to which this application belongs. It should also be understood that terms such as those defined in common dictionaries should be understood to have meanings consistent with their meanings in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless specifically defined.

[0033] In this application, the terms "first," "second," etc. are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the quantity of the technical features indicated. In the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0034] Furthermore, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," and the like should be interpreted broadly. For example, they may refer to fixed or detachable connections, or integration; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0035] like Figure 2-5 As shown, the embodiment of the present application provides a general-purpose muffler, comprising a muffler housing 2 having an expansion chamber 1 and a muffler structure 3 disposed in the muffler housing 2, wherein the muffler structure 3 comprises at least one reactive muffler unit 4, wherein:

[0036] A sealing plate 5 is radially arranged in the muffler shell 2, which divides the expansion chamber 1 into a first chamber 11 and a second chamber 12. A first mounting through hole 51 is opened in the middle of the sealing plate 5, and the muffler structure 3 is installed in the first mounting through hole 51. The two ends of the muffler structure 3 are respectively embedded in the first chamber 11 and the second chamber 12 and connect the first chamber 11 and the second chamber 12.

[0037] The general-purpose muffler of the embodiment of the present application is provided with a sealing plate 5 radially arranged in a muffler housing 2 having an expansion chamber 1, and the expansion chamber 1 is divided into a first chamber 11 and a second chamber 12 by the sealing plate 5. A first mounting through hole 51 is opened in the middle of the sealing plate 5, and a muffler structure 3 having at least one resistive muffler unit 4 is installed in the first mounting through hole 51, and the two ends of the muffler structure 3 are respectively embedded in the first chamber 11 and the second chamber 12 and connect the first chamber 11 and the second chamber 12, thereby effectively improving the muffler performance of the general-purpose muffler under the premise of ensuring that the installation space of the muffler is not increased.

[0038] In one embodiment, the resistive silencer unit 4 includes an inner tube 41 arranged along the axial direction of the silencer, and a silencer baffle 42 is provided at the air outlet end of the inner tube 41. The silencer baffle 42 and the inner tube 41 form a resonance chamber 43. A second mounting through hole 421 and an air vent 422 are provided on the silencer baffle 42. The air vent 422 is used to connect the first chamber 11 and the second chamber 12. A ventilation pipe 44 is provided through the second mounting through hole 421. The ventilation pipe 44 is used to connect the first chamber 11 and the second chamber 12. The resistive silencer unit 4 in this embodiment is provided with an inner tube 41, and a silencer baffle 42 with air holes 422 is provided at the air outlet end of the inner tube 41. The air holes 422 on the silencer baffle 42 can control the impedance of the airflow on the one hand, and on the other hand, the silencer baffle 42 and the inner tube 41 form a resonance chamber 43, so that the sound reaches the resonance frequency in the resonance chamber 43, thereby realizing the conversion from sound energy to kinetic energy and achieving the silencer effect.

[0039] Specifically, the aperture and number of the vent holes 422 on the muffler baffle 42 and the diameter of the vent pipe 44 can be set through experiments according to the frequency range of the noise to be eliminated.

[0040] In one embodiment, the muffler structure 3 includes multiple reactive muffler units 4, each of which is arranged in series along the axial direction of the muffler, with adjacent reactive muffler units 4 fixedly connected. This embodiment effectively enhances the muffler effect by providing multiple reactive muffler units 4 in series. It should be noted that the number of reactive muffler units 4 can be determined experimentally based on the desired noise frequency range.

[0041] In one embodiment, the air inlet end of the inner tube 41 of the rear reactive muffler unit 4 is sealed and connected to the air outlet end of the inner tube 41 of the front reactive muffler unit 4 by welding. This ensures the connection reliability of the two adjacent reactive muffler units 4 and also seals the connection between the two reactive muffler units 4, effectively enhancing the resonance effect and thus the muffler effect.

[0042] In one embodiment, the number of reactive muffler units 4 is an odd number, and the outer wall of the inner tube 41 of the middle reactive muffler unit 4 is sealed to the inner wall of the first mounting hole 51. This arrangement enables uniform muffler silencing in the first chamber 11 and the second chamber 12, reduces the loudness of the muffler, and improves the sound quality of the muffler.

[0043] In one embodiment, the air inlet end of the vent pipe 44 extends into the resonance chamber 43, and the air outlet end of the vent pipe 44 is arranged to protrude relative to the air outlet side of the muffler baffle 42. This effectively increases the exhaust gas processing time in the muffler, allowing the sound to better resonate in the resonance chamber 43 formed between the outer wall of the vent pipe 44, the muffler baffle 42, and the inner tube 41, thereby improving the sound reduction effect.

[0044] In one embodiment, the muffler housing 2 includes an outer tube 21, an air inlet pipe 22, an air outlet pipe 23, a first outer sealing plate 24 and a second outer sealing plate 25. The diameters of the air inlet pipe 22 and the air outlet pipe 23 are the same and are both smaller than the diameter of the outer tube 21. One end of the outer tube 21 is connected to the air inlet pipe 22 through the first outer sealing plate 24, and the other end of the outer tube 21 is connected to the air outlet pipe 23 through the second outer sealing plate 25. The first outer sealing plate 24, the outer tube 21 and the second outer sealing plate 25 form an expansion chamber 1.

[0045] In one embodiment, the outlet end of the inlet pipe 22 extends into the first chamber 11, and the inlet pipe 22 of the outlet pipe 23 extends into the second chamber 12. This arrangement can effectively increase the processing time of the exhaust gas in the muffler and enhance the muffler effect.

[0046] like Figure 6-Figure 8 As shown, Figure 6 yes Figure 1 The sound pressure cloud diagram of the existing general engine muffler is shown. Figure 7 yes Figure 5 The sound pressure cloud diagram of the general muffler in the embodiment of the present application is shown. Figure 8 yes Figure 5 The muffler of the present application embodiment is shown in FIG. Figure 1 The figure shows a comparison of the outlet response characteristic curves of existing general-purpose mufflers.

[0047] By comparison Figure 6 and Figure 7It can be seen that the general machine muffler in the embodiment of the present application can effectively reduce the sound pressure on the surface of the muffler cylinder, thereby reducing noise.

[0048] By comparison Figure 8 The blue curve in ( Figure 1 The outlet response characteristic curve of the existing general-purpose muffler shown) and the orange curve ( Figure 5 As shown in the outlet response characteristic curve of the general-purpose muffler in the embodiment of the present application, it can be seen that the general-purpose muffler in the embodiment of the present application can effectively reduce the outlet response in the low-frequency band, thereby reducing the loudness of the muffler, reducing noise, and improving the sound quality of the muffler.

[0049] An embodiment of the present application also provides an engine exhaust system, comprising the engine-wide muffler in any of the above embodiments.

[0050] It should be noted that, since the engine exhaust system includes the general muffler in any of the above embodiments, the engine exhaust system has the same technical effects as the general muffler in each of the above embodiments. The specific structure of the engine exhaust system belongs to the prior art and will not be described in detail here.

[0051] An embodiment of the present application also provides a general engine, including the engine exhaust system in the above embodiment.

[0052] It should be noted that, since the engine exhaust system includes the engine exhaust system in the above embodiment, the general engine has the same technical effects as the engine exhaust system in the above embodiment. The specific structure of the general engine belongs to the prior art and will not be described here.

[0053] Those skilled in the art will appreciate that although some embodiments herein include certain features included in other embodiments but not other features, the combination of features from different embodiments is intended to be within the scope of this application and to form different embodiments. In some instances, well-known methods, structures, and techniques are not shown in detail in order not to obscure the understanding of this specification.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and description of the present application.

Claims

1. A general muffler, characterized in that: The invention comprises a muffler shell having an expansion chamber and a muffler structure arranged in the muffler shell, wherein the muffler structure comprises at least one reactive muffler unit, wherein: A sealing plate is radially arranged inside the muffler shell, and the sealing plate divides the expansion chamber into a first chamber and a second chamber. A first mounting through hole is opened in the middle of the sealing plate, and the muffler structure is installed in the first mounting through hole. The two ends of the muffler structure are respectively embedded in the first chamber and the second chamber to connect the first chamber and the second chamber.

2. The muffler according to claim 1, characterized in that: The resistive silencer unit includes an inner tube arranged along the axial direction of the silencer, and a silencer baffle is provided at the air outlet end of the inner tube. The silencer baffle and the inner tube form a resonance chamber. A second mounting through hole and an air vent are provided on the silencer baffle. The air vent is used to connect the first chamber and the second chamber. A ventilation pipe is provided through the second mounting through hole. The ventilation pipe is used to connect the first chamber and the second chamber.

3. The muffler according to claim 2, characterized in that: The muffler structure includes a plurality of reactive muffler units, each of which is arranged in series along the axial direction of the muffler, and two adjacent reactive muffler units are fixedly connected.

4. The muffler according to claim 3, characterized in that: The air inlet end of the inner tube of the latter resistive silencer unit is sealed and connected to the air outlet end of the inner tube of the former resistive silencer unit by welding.

5. The muffler according to claim 3, characterized in that: The number of the reactive silencer units is an odd number, and the outer wall of the inner tube of the reactive silencer unit located in the middle is sealed and connected to the inner wall of the first mounting through hole.

6. The muffler according to claim 2, characterized in that: The air inlet end of the vent pipe extends into the resonance chamber, and the air outlet end of the vent pipe is protruding relative to the air outlet side of the muffler baffle.

7. The muffler according to any one of claims 1 to 6, characterized in that: The muffler shell includes an outer tube, an air inlet pipe, an air outlet pipe, a first outer sealing plate and a second outer sealing plate. The diameters of the air inlet pipe and the air outlet pipe are the same and are both smaller than the diameter of the outer tube. One end of the outer tube is connected to the air inlet pipe through the first outer sealing plate, and the other end of the outer tube is connected to the air outlet pipe through the second outer sealing plate. The first outer sealing plate, the outer tube and the second outer sealing plate form the expansion chamber.

8. The general muffler according to claim 7, characterized in that: The air outlet end of the air inlet pipe extends into the first chamber, and the air inlet pipe of the air outlet pipe extends into the second chamber.

9. An engine exhaust system, characterized in that: The invention comprises the general muffler according to any one of claims 1 to 8.

10. A general engine, characterized in that: Includes the engine exhaust system as claimed in claim 9.

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