Silencer
By designing a flow guide tube and baffle on the muffler body and installing the oxygen sensor on the flow guide tube, the problem of the oxygen sensor's detection accuracy being affected is solved, achieving higher detection accuracy and noise reduction effect.
Patent Information
- Application Number
- CN202520220304.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-11
- Publication Date
- 2025-12-02
- Estimated Expiration
- 2035-02-11
AI Technical Summary
When existing oxygen sensors are installed on mufflers, the large internal space and loose structure of the mufflers cause the exhaust gas to disperse and allow outside air to enter, affecting the detection accuracy.
A flow guide tube is designed on the muffler body, and the oxygen sensor is installed on the flow guide tube. The probe is close to the air inlet and far away from the exhaust port. The inner cavity is divided into multiple chambers by a partition. The airflow path is extended by using the silencer hole and the flow guide tube to reduce noise.
The detection accuracy of the oxygen sensor was improved, the flow path of the exhaust airflow was extended, and the noise was gradually attenuated, achieving the effect of noise reduction.
Smart Images
Figure CN223621666U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of silencer technology, and specifically to a silencer. Background Technology
[0002] An oxygen sensor is a measuring element that uses a ceramic sensing element to measure the oxygen potential in exhaust gas and calculates the corresponding oxygen concentration based on the principle of chemical equilibrium. This allows for the monitoring and control of the air-fuel ratio to ensure product quality and compliance with exhaust emission standards.
[0003] Existing oxygen sensors are typically mounted on the muffler housing and connected to the muffler's internal cavity. Due to the large internal space of the muffler, the exhaust gas flow is relatively dispersed, failing to meet the requirements of the sensor for detecting exhaust gas flow. Furthermore, because the muffler's structure cannot be completely sealed, negative pressure generated during engine operation draws outside air into the muffler's internal cavity through the exhaust port, thus affecting the oxygen sensor's detection accuracy. Utility Model Content
[0004] In view of the deficiencies in the existing technology, the purpose of this utility model is to provide a silencer to improve the detection accuracy of oxygen sensors.
[0005] To achieve the above objectives, this utility model provides a muffler, including a muffler body, a partition, an air inlet, and an exhaust outlet. The partition divides the inner cavity of the muffler body into a first cavity and a second cavity. The first cavity is connected to the second cavity, and the second cavity is connected to the exhaust outlet. The air inlet is located on the side of the second cavity opposite to the first cavity, and the exhaust outlet is located on the side of the first cavity opposite to the second cavity. A guide pipe is connected at one end to the air inlet and at the other end to the first cavity. An oxygen sensor is disposed on the guide pipe and extends into the guide pipe.
[0006] Preferably, one end of the guide tube passes through the first cavity and the second cavity and is connected to the air inlet, and the other end of the guide tube extends out of the guide tube and is connected to the first cavity. The oxygen sensor is located outside the muffler body.
[0007] Preferably, the oxygen sensor is located away from the connection point between the guide tube and the first cavity.
[0008] Preferably, the guide tube includes a first tube and a second tube. The first tube passes through the muffler body, one end of the first tube is connected to the air inlet, and the other end of the first tube extends out of the muffler body. The oxygen sensor is disposed on the first tube. The second tube has a bent tube structure, one end of the second tube is connected to the first tube, and the other end of the second tube is connected to the first cavity.
[0009] Preferably, the guide tube is disposed in the first cavity, and one end of the guide tube passes through the partition and extends into the second cavity.
[0010] Preferably, the guide pipe is disposed on the partition plate.
[0011] Preferably, the guide tube is provided with a mounting base, and the oxygen sensor is mounted on the mounting base.
[0012] Preferably, the partition is provided with a plurality of first silencing holes, and the first cavity and the second cavity are connected through the first silencing holes.
[0013] Preferably, the partition plate is provided with a housing and a plurality of second silencer holes, the housing is located in the first cavity, a third cavity is formed between the housing and the partition plate, the third cavity is connected to the exhaust port, and the third cavity is connected to the second cavity through the second silencer holes.
[0014] Preferably, the muffler body is provided with an exhaust pipe, one end of which is connected to the exhaust port, and the other end of which extends into the third cavity and abuts against the partition plate. The exhaust pipe is provided with a plurality of third muffler holes on the pipe wall of the third cavity.
[0015] The beneficial effects of this utility model are:
[0016] This utility model discloses a muffler that incorporates a guide tube on its body. Since the oxygen sensor is mounted on this tube, with its probe close to the air intake and far from the exhaust port, outside air entering the muffler body avoids affecting the sensor's detection accuracy, thus improving its precision. Simultaneously, the exhaust airflow sequentially passes through the air intake and guide tube into the first chamber, then flows to the second chamber before finally exiting through the exhaust port. Therefore, this muffler's structural design extends the exhaust airflow path, causing the exhaust noise to gradually weaken during propagation, thereby achieving noise reduction. Attached Figure Description
[0017] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.
[0018] Figure 1 This is a schematic diagram of the structure of the muffler provided in Embodiment 2 of this utility model;
[0019] Figure 2 This is a structural schematic diagram of the muffler from another perspective in Example 2;
[0020] Figure 3 This is a schematic diagram of the partition structure in Example 2;
[0021] Figure 4 This is a schematic diagram of the structure on the other side of the partition in Example 2;
[0022] Figure 5 This is a side view of the muffler in Embodiment 2;
[0023] Figure 6 for Figure 5 Schematic diagram of AA section in the middle;
[0024] Figure 7 for Figure 5 Schematic diagram of the BB cross section in the middle;
[0025] Figure 8 This is a schematic diagram of the muffler provided in Embodiment 3;
[0026] Figure 9 This is a structural schematic diagram of the muffler from another perspective in Example 3;
[0027] Figure 10 This is a schematic diagram of the partition structure in Example 3;
[0028] Figure 11 This is a schematic diagram of the structure on the other side of the partition in Embodiment 3;
[0029] Figure 12 This is a side view of the muffler in Embodiment 3;
[0030] Figure 13 for Figure 12 Schematic diagram of the CC section in the image;
[0031] Figure label:
[0032] 10. Muffler body; 11. Baffle plate; 111. First muffler hole; 112. Second muffler hole; 12. Air inlet; 13. Exhaust outlet; 14. First chamber; 15. Second chamber; 20. Guide pipe; 21. First pipe body; 22. Second pipe body; 30. Mounting base; 40. Housing; 50. Third chamber; 60. Exhaust pipe; 61. Third muffler hole. Detailed Implementation
[0033] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of protection of the present invention.
[0034] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application shall have the ordinary meaning as understood by one of ordinary skill in the art to which this utility model pertains.
[0035] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.
[0036] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly defined.
[0037] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0038] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0039] Example 1
[0040] In one embodiment of this utility model, a muffler is provided, including a muffler body 10, a guide pipe 20, and an oxygen sensor. The muffler body 10 is provided with a partition 11, an air inlet 12, and an exhaust outlet 13. The partition 11 divides the inner cavity of the muffler body 10 into a first cavity 14 and a second cavity 15. The first cavity 14 communicates with the second cavity 15, and the second cavity 15 communicates with the exhaust outlet 13. The air inlet 12 is located on the side of the second cavity 15 opposite to the first cavity 14, and the exhaust outlet 13 is located on the side of the first cavity 14 opposite to the second cavity 15. One end of the guide pipe 20 communicates with the air inlet 12, and the other end of the guide pipe 20 communicates with the first cavity 14. An oxygen sensor (not shown in the figure) is mounted on the guide pipe 20, and the probe of the oxygen sensor extends into the guide pipe 20.
[0041] This embodiment discloses a muffler that incorporates a guide pipe 20 on the muffler body 10. Since the oxygen sensor is mounted on the guide pipe 20, with its probe close to the air intake 12 and far from the exhaust port 13 (which connects to the outside), the entry of outside air into the muffler body 10 avoids affecting the oxygen sensor's detection accuracy, thus improving its accuracy. Simultaneously, the exhaust airflow from the engine sequentially passes through the air intake 12 and the guide pipe 20 into the first chamber 14, then flows from the first chamber 14 to the second chamber 15, and finally exits from the exhaust port 13. Therefore, this muffler's structural design extends the exhaust airflow path, causing the exhaust noise to gradually weaken during propagation, thereby achieving noise reduction.
[0042] In one embodiment, a mounting base 30 is fixedly installed on the flow guide tube 20, and the oxygen sensor is mounted on the mounting base 30. By designing the mounting base 30 on the flow guide tube 20, a stable connection between the oxygen sensor and the flow guide tube 20 can be achieved, thereby facilitating the installation and removal of the oxygen sensor.
[0043] In one embodiment, the partition 11 is provided with a plurality of first silencing holes 111, and the first cavity 14 and the second cavity 15 are connected through the first silencing holes 111. After the airflow discharged from the guide pipe 20 enters the first cavity 14, the noise will collide with the cavity wall of the first cavity 14 and cancel each other out through friction, ultimately destroying part of the noise and achieving the purpose of noise reduction. Noise and airflow can only enter the second cavity 15 through the first silencing holes 111. During the process of the noise passing through the first silencing holes 111, a strong resonance effect is generated, which weakens the noise, thereby effectively reducing the noise of the airflow entering the second cavity 15.
[0044] In one embodiment, the partition 11 is provided with a housing 40 and a plurality of second silencing holes 112. The housing 40 is located inside the first cavity 14, and a third cavity 50 is formed between the housing 40 and the partition 11. The third cavity 50 is connected to the exhaust port 13, and the third cavity 50 is connected to the second cavity 15 through the second silencing holes 112. The muffler body 10 is provided with an exhaust pipe 60. One end of the exhaust pipe 60 is connected to the exhaust port 13, and the other end of the exhaust pipe 60 extends into the third cavity 50 and abuts against the partition 11. The exhaust pipe 60 is provided with a plurality of third silencing holes 61 on the pipe wall of the third cavity 50.
[0045] The airflow entering the second chamber 15 can only enter the third chamber 50 through the second silencer hole 112. As the noise passes through the second silencer hole 112, it will generate a violent resonance, which will further reduce the noise. Similarly, as the airflow passes through the third silencer hole 61, the noise in the airflow will also be reduced, thereby achieving the purpose of noise reduction.
[0046] Example 2
[0047] This embodiment includes all the components described in Embodiment 1 above, and their working principles are the same. The difference is that, as shown in the reference... Figure 1-7 In this embodiment, the guide tube 20 adopts an external structure. Specifically, one end of the guide tube 20 passes through the first cavity 14 and the second cavity 15 and is connected to the air inlet 12. The other end of the guide tube 20 extends out of the guide tube 20 and is connected to the first cavity 14. The oxygen sensor is located outside the muffler body 10.
[0048] The airflow exhausted from the engine passes through the intake port 12 and the guide pipe 20 sequentially into the first chamber 14, then flows from the first chamber 14 to the second chamber 15, and finally exits from the exhaust port 13. Since the oxygen sensor is mounted on the guide pipe 20 located outside the muffler body 10, the oxygen sensor probe is close to the intake port 12 and far from the exhaust port 13, which connects to the outside. This prevents outside air from entering the muffler body 10 and affecting the detection accuracy of the oxygen sensor, thus improving the detection accuracy.
[0049] Meanwhile, since the oxygen sensor is installed on the pipe body of the guide pipe 20 outside the muffler body 10, it is convenient to disassemble and install the oxygen sensor, which is beneficial for later maintenance.
[0050] In one embodiment, the oxygen sensor probe is located away from the connection between the guide tube 20 and the first cavity 14, and the oxygen sensor probe is closer to the air inlet 12. This keeps the oxygen sensor away from the first cavity 14, thereby preventing outside air from entering the muffler body 10 and affecting the detection accuracy of the oxygen sensor.
[0051] In one embodiment, the guide tube 20 includes a first tube body 21 and a second tube body 22. The first tube body 21 passes through the muffler body 10, with one end connected to the air inlet 12 and the other end extending outside the muffler body 10. An oxygen sensor is mounted on the first tube body 21. The second tube body 22 has a bent tube structure, with one end connected to the first tube body 21 and the other end connected to the first cavity 14. By designing the guide tube 20 as a split structure, it is easier to process and manufacture the guide tube 20.
[0052] Example 3
[0053] This embodiment includes all the components described in Embodiment 1 above, and their working principles are the same. The difference is that, as shown in the reference... Figure 8-13 In this embodiment, the guide pipe 20 adopts an internal structure, that is, the guide pipe 20 is located inside the first cavity 14. Specifically, the guide pipe 20 is fixed on the partition plate 11, and one end of the guide pipe 20 passes through the partition plate 11 and extends into the second cavity 15. The mounting base 30 passes through the outer shell of the muffler body 10 and is fixed to the guide pipe 20. Since the guide pipe 20 is installed inside the muffler body 10, this structural design can reduce the space occupied by the muffler and make the overall structure of the muffler more compact.
[0054] Numerous specific details are set forth in this specification. However, it will be understood that embodiments of this invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.
[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model.
Claims
1. A silencer, characterized in that, include: The muffler body (10) is provided with a partition (11), an air inlet (12) and an exhaust outlet (13). The partition (11) divides the inner cavity of the muffler body (10) into a first cavity (14) and a second cavity (15). The first cavity (14) is connected to the second cavity (15), and the second cavity (15) is connected to the exhaust outlet (13). The air inlet (12) is located on the side of the second cavity (15) away from the first cavity (14), and the exhaust outlet (13) is located on the side of the first cavity (14) away from the second cavity (15). A guide tube (20) is connected at one end to the air inlet (12) and at the other end to the first cavity (14); and An oxygen sensor is mounted on the guide tube (20) and extends into the guide tube (20).
2. The silencer according to claim 1, characterized in that, One end of the guide tube (20) passes through the first cavity (14) and the second cavity (15) and is connected to the air inlet (12). The other end of the guide tube (20) extends out of the guide tube (20) and is connected to the first cavity (14). The oxygen sensor is located outside the muffler body (10).
3. The silencer according to claim 2, characterized in that, The oxygen sensor is located away from the connection between the guide tube (20) and the first cavity (14).
4. The silencer according to claim 2, characterized in that, The guide pipe (20) includes a first pipe body (21) and a second pipe body (22). The first pipe body (21) is installed on the muffler body (10). One end of the first pipe body (21) is connected to the air inlet (12), and the other end of the first pipe body (21) extends out of the muffler body (10). The oxygen sensor is installed on the first pipe body (21). The second tube (22) has a bent tube structure. One end of the second tube (22) is connected to the first tube (21), and the other end of the second tube (22) is connected to the first cavity (14).
5. The silencer according to claim 1, characterized in that, The guide tube (20) is located in the first cavity (14), and one end of the guide tube (20) passes through the partition (11) and extends into the second cavity (15).
6. The silencer according to claim 4, characterized in that, The guide pipe (20) is disposed on the partition plate (11).
7. The silencer according to claim 1, characterized in that, The guide tube (20) is provided with a mounting base (30), and the oxygen sensor is mounted on the mounting base (30).
8. The silencer according to claim 1, characterized in that, The partition (11) is provided with a plurality of first silencing holes (111), and the first cavity (14) and the second cavity (15) are connected through the first silencing holes (111).
9. The silencer according to claim 1, characterized in that, The partition (11) is provided with a housing (40) and a plurality of second silencer holes (112). The housing (40) is located in the first cavity (14). A third cavity (50) is formed between the housing (40) and the partition (11). The third cavity (50) is connected to the exhaust port (13). The third cavity (50) is connected to the second cavity (15) through the second silencer holes (112).
10. The silencer according to claim 9, characterized in that, The muffler body (10) is provided with an exhaust pipe (60), one end of which is connected to the exhaust port (13), and the other end of which extends into the third cavity (50) and abuts against the partition plate (11). The exhaust pipe (60) is provided with a plurality of third muffler holes (61) on the pipe wall of the third cavity (50).