Exhaust connecting pipe and silencing system

Abstract

The utility model provides an exhaust connecting pipe and a silencing system. The exhaust connecting pipe comprises a first pipe body, a second pipe body and a flow blocking piece. The second pipe body is arranged in the first pipe body in a penetrating mode, and an overflowing cavity is formed between the second pipe body and the first pipe body. A plurality of first through holes penetrate through the pipe wall, located in the first pipe body, of the second pipe body, and an air inlet and an air outlet are formed in the two ends of the second pipe body respectively. The flow blocking piece is arranged in the second pipe body and used for slowing down the flow speed of the airflow in the second pipe body and guiding part of the airflow to the overflowing cavity. The exhaust connecting pipe can slow down the flow speed of exhaust airflow of the cylinder head to a certain extent, so that the flow speed of the airflow before entering the silencer is lower than that of a conventional structure, the problem that the flow speed of the exhaust airflow is too high is solved without excessively designing the structure of an inner cavity of the silencer, the structure of the inner cavity of the silencer is simplified, and the cost is reduced. The silencer can achieve silencing with a smaller size, and the production cost of the silencer is also reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of exhaust devices, in particular to an exhaust connecting pipe and a silencer system. Background Art

[0002] An exhaust muffler is a device that uses the principle of sound waves canceling out and interfering with each other to reduce noise. It also helps lower exhaust temperatures. During operation, the engine generates a significant amount of heat, some of which is discharged with the exhaust airflow from the cylinder head. Excessive exhaust flow rates and temperatures can negatively impact both the engine and the environment. Therefore, using an exhaust muffler to reduce exhaust flow rates and temperatures can both reduce engine load and reduce environmental pollution.

[0003] Currently, reducing exhaust flow velocity typically involves modifying the internal structure of the muffler. This requires both suppressing airflow noise and controlling the flow velocity. This results in a more complex internal structure, which naturally occupies more space. Therefore, reducing the velocity of the exhaust flow from the cylinder head before entering the muffler is a pressing issue for those skilled in the art. Utility Model Content

[0004] In view of the defects in the prior art, the purpose of the present invention is to provide an exhaust connecting pipe and a silencer system to reduce the flow rate of the cylinder head exhaust airflow before entering the muffler.

[0005] In order to achieve the above-mentioned purpose, the present invention provides an exhaust connecting pipe, including a first pipe body; a second pipe body, which is inserted into the first pipe body and forms a flow chamber between the second pipe body and the first pipe body, and the second pipe body is provided with a plurality of first through holes on the pipe wall inside the first pipe body, and an air inlet and an exhaust port are respectively provided at both ends of the second pipe body; and a flow blocker, which is provided in the second pipe body, and is used to slow down the flow rate of the airflow in the second pipe body and guide part of the airflow to the flow chamber.

[0006] Preferably, a circumferential edge of the flow blocking member is connected to the inner side wall of the second tube body, and a second through hole passes through the flow blocking member.

[0007] Preferably, the axis of the second through hole coincides with the axis of the second tube body.

[0008] Preferably, the distance between the baffle and the air inlet is denoted as L1, and the distance between the baffle and the exhaust port is denoted as L2, and L1 is greater than L2.

[0009] Preferably, the axis of the first tube body coincides with the axis of the second tube body.

[0010] Preferably, both ends of the second tube body extend out of the first tube body and form extension parts, and the extension parts are provided with connecting flanges.

[0011] Preferably, the connecting flange abuts against the end surface of the first tube body.

[0012] Preferably, a flow direction mark is provided on the outer side wall of the first tube.

[0013] The utility model also provides a muffler system, comprising the above-mentioned exhaust connecting pipe.

[0014] Beneficial effects of the utility model:

[0015] The utility model discloses an exhaust connecting pipe and silencer system. By arranging the exhaust connecting pipe between the cylinder head and the muffler, the exhaust connecting pipe can slow down the flow rate of the exhaust airflow from the cylinder head to a certain extent, making the flow rate of the airflow before entering the muffler lower than that of conventional structures. This eliminates the need to over-design the structure of the muffler's internal chamber to solve the problem of excessive exhaust airflow velocity. The structure of the muffler's internal chamber is simplified, allowing the muffler to achieve silence with a smaller volume, thereby reducing the production cost of the muffler. Furthermore, the exhaust connecting pipe does not require changing the installation position and installation structure of the existing muffler and cylinder head, and can be used directly with existing models, thus further improving the economic efficiency of the entire machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly describes the drawings required for the specific embodiments or the description of the prior art. Similar elements or parts are generally identified by similar reference numerals throughout the drawings. Elements or parts in the drawings are not necessarily drawn to scale.

[0017] Figure 1 A schematic cross-sectional view of an exhaust connecting pipe provided in one embodiment of the present invention;

[0018] Figure 2 is a schematic diagram of the interior of the exhaust connecting pipe;

[0019] Figure 3 is a structural schematic diagram of the second tube body;

[0020] Figure 4 Schematic diagram of the structure of the baffle;

[0021] Figure 5 This is a schematic diagram of the structure after the two connecting flanges are hidden;

[0022] Figure 6 This is a schematic diagram of the installation of the exhaust connecting pipe;

[0023] Reference numerals:

[0024] 10. First tube body; 20. Second tube body; 21. First through hole; 22. Air inlet; 23. Exhaust port; 24. Extension portion; 30. Flow blocker; 31. Second through hole; 40. Flow chamber; 50. Connecting flange. DETAILED DESCRIPTION

[0025] The following embodiments of the technical solution of the present invention are described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and are therefore only examples and are not intended to limit the scope of protection of the present invention.

[0026] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by those skilled in the art to which this utility model belongs.

[0027] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0028] In addition, the terms "first," "second," etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. In the description of this utility model, "plurality" means more than two, unless otherwise specifically defined.

[0029] In this application, unless otherwise expressly specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; 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 utility model based on specific circumstances.

[0030] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0031] like Figure 1-6 As shown, in one embodiment of the present invention, an exhaust connecting pipe and a silencer system are provided, comprising a first tube body 10, a second tube body 20 and a flow blocker 30. The second tube body 20 is arranged inside the first tube body 10, and a flow chamber 40 is formed between the second tube body 20 and the first tube body 10. A plurality of first through holes 21 are penetrated on the tube wall of the second tube body 20 located inside the first tube body 10, and an air inlet 22 and an exhaust port 23 are respectively provided at both ends of the second tube body 20. The flow blocker 30 is arranged inside the second tube body 20, and the flow blocker 30 is used to slow down the flow rate of the airflow in the second tube body 20 and guide part of the airflow to the flow chamber 40.

[0032] See Figure 1 and Figure 6 The exhaust connecting pipe is connected to the cylinder head and muffler of the engine respectively, and the exhaust airflow of the cylinder head ( Figure 1 The middle arrow indicates the direction of exhaust gas flow. After the exhaust gas flows into the second tube body 20 from the air inlet 22, a portion of the air flow will enter the flow chamber 40 from the first through hole 21. During this process, due to the sudden expansion of the channel cross-section, the flow rate of the air flow entering the flow chamber 40 will decrease, and the flow direction will also change.

[0033] The other part of the airflow will flow along the second tube body 20. This part of the airflow will be blocked by the baffle 30 in the process of passing through the baffle 30, and part of the airflow will enter the flow chamber 40 from the first through hole 21. The airflow flowing through the baffle 30 will suck the airflow in the flow chamber 40 into the second tube body 20 in the process of flowing toward the exhaust port 23, and finally flow out from the exhaust port 23. In this way, the flow path of the airflow entering the second tube body 20 is extended and the flow rate of the airflow is slowed down. At the same time, the airflow will produce a violent resonance effect in the process of passing through the first through hole 21, thereby weakening the noise of the airflow, thereby achieving a certain noise reduction effect.

[0034] In summary, the exhaust connecting pipe and silencer system disclosed in this embodiment, by arranging the exhaust connecting pipe between the cylinder head and the muffler, can slow down the flow rate of the exhaust airflow from the cylinder head to a certain extent, making the flow rate of the airflow before entering the muffler lower than that of the conventional structure. In this way, there is no need to over-design the structure of the internal chamber of the muffler to solve the problem of excessive exhaust airflow velocity. The structure of the internal chamber of the muffler is simplified, allowing the muffler to achieve silence in a smaller volume, and also reducing the production cost of the muffler. In addition, the exhaust connecting pipe does not require changing the installation position and installation structure of the existing muffler and cylinder head, and can be used directly with existing models, thus further improving the economic efficiency of the entire machine.

[0035] In one embodiment, the circumferential edge of the baffle 30 is connected to the inner wall of the second tube body 20, and the baffle 30 is penetrated by a second through hole 31. The baffle 30 is a circular ring structure, and the outer wall of the baffle 30 is fastened to the inner wall of the second tube body 20 by welding. After the airflow is blocked by the baffle 30, a portion of the airflow will enter the flow chamber 40 from the first through hole 21. The other portion of the airflow will pass through the second through hole 31 and flow to the exhaust port 23. During the flow process, this portion of the airflow will draw the airflow in the flow chamber 40 into the second tube body 20 through the first through hole 21, and finally flow to the exhaust port 23.

[0036] In one embodiment, the axis of the second through hole 31 coincides with the axis of the second tube body 20, so that the baffle 30 can more evenly guide the airflow to the first through hole 21, making the impact force applied by the airflow to the baffle 30 more uniform, thereby ensuring the stability of the baffle 30.

[0037] See Figure 1 In one embodiment, the distance between the baffle 30 and the air inlet 22 is L1, and the distance between the baffle 30 and the air outlet 23 is L2, where L1 is greater than L2. This structural design enhances the airflow blocking effect of the baffle 30, directing most of the airflow toward the flow chamber 40, thereby improving the airflow velocity reduction effect.

[0038] In one embodiment, the axis of the first tube body 10 coincides with the axis of the second tube body 20 , thereby ensuring the uniformity of the thickness of the flow chamber 40 , which is beneficial to the heat dissipation effect of the exhaust connecting pipe.

[0039] In one embodiment, in order to facilitate the stable connection between the exhaust connecting pipe and the cylinder head and the muffler, both ends of the second pipe body 20 extend out of the first pipe body 10 and form extension parts 24, and the extension parts 24 are provided with connecting flanges 50.

[0040] In one embodiment, in order to limit the installation position of the connecting flange 50 , the connecting flange 50 abuts against the end surface of the first tube body 10 .

[0041] In one embodiment, in order to facilitate the assembler to distinguish the installation direction of the exhaust connecting pipe, the outer wall of the first pipe body 10 is provided with a flow direction mark (not shown in the figure).

[0042] In the specification of the present invention, a large number of specific details are described. However, it is understood that the embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this specification.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above 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 invention, and they should all be included in the scope of the claims and description of the present invention.

Claims

1. An exhaust connecting pipe, characterized in that: include: first tube body (10); a second tube body (20) passing through the first tube body (10) and forming a flow chamber (40) between the second tube body (20) and the first tube body (10); a plurality of first through holes (21) are provided on a tube wall of the second tube body (20) located inside the first tube body (10); and an air inlet (22) and an air outlet (23) are respectively provided at two ends of the second tube body (20); as well as The flow blocking member (30) is arranged in the second tube body (20), and the flow blocking member (30) is used to slow down the flow velocity of the airflow in the second tube body (20) and guide part of the airflow to the flow chamber (40).

2. The exhaust connecting pipe according to claim 1, characterized in that: The circumferential edge of the flow-blocking member (30) is connected to the inner wall of the second tube body (20), and a second through hole (31) penetrates the flow-blocking member (30).

3. The exhaust connecting pipe according to claim 2, characterized in that: The axis of the second through hole (31) coincides with the axis of the second tube body (20).

4. The exhaust connecting pipe according to claim 2, characterized in that: The distance between the baffle (30) and the air inlet (22) is recorded as L1, and the distance between the baffle (30) and the air outlet (23) is recorded as L2, and L1 is greater than L2.

5. The exhaust connecting pipe according to claim 1, characterized in that: The axis of the first tube (10) coincides with the axis of the second tube (20).

6. The exhaust connecting pipe according to claim 1, characterized in that: Both ends of the second tube body (20) extend out of the first tube body (10) and form extension parts (24), and a connecting flange (50) is provided on the extension part (24).

7. The exhaust connecting pipe according to claim 6, characterized in that: The connecting flange (50) abuts against the end surface of the first tube body (10).

8. The exhaust connecting pipe according to claim 4, characterized in that: The outer side wall of the first tube body (10) is provided with a flow direction mark.

9. A muffler system, characterized in that: The invention comprises the exhaust connecting pipe according to any one of claims 1 to 8.

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