Exhaust device of internal combustion engine
By introducing an adjustable flow limiting mechanism into the exhaust device of the internal combustion engine, the flow section of the exhaust passage is adjusted according to the rotation speed, the problem of exhaust gas return at low speed is solved, the low-speed performance and medium-high-speed performance are improved, and fuel consumption and emissions are reduced.
Patent Information
- Application Number
- CN202421026836.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-13
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2034-05-13
AI Technical Summary
The exhaust devices of the existing internal combustion engine are prone to exhaust gas return when they are low-speed, resulting in a decrease in cylinder inflation efficiency and an increase in fuel consumption, and the prior art cannot effectively improve low-speed performance.
Design an internal combustion engine exhaust device, including an adjustable current limiting mechanism, adjust the effective flow section size of the exhaust passage according to the rotation speed of the internal combustion engine, ensure that the exhaust gas back pressure is high at low speed, prevent exhaust gas from flowing back, and exhaust gas at high speed Low back pressure to avoid the impact on medium and high-speed performance.
It effectively improves the low-speed performance of the internal combustion engine, reduces fuel consumption, and optimizes emissions, ensuring the improvement of the performance of the entire machine.
Smart Images
Figure CN222141363U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to exhaust equipment of a combustion engine, in particular to an exhaust device of an internal combustion engine. Background Art
[0002] The exhaust device of an internal combustion engine refers to a device that discharges the exhaust gas discharged from the cylinder of the internal combustion engine according to a certain route and requirements. Generally, the exhaust device of an internal combustion engine includes an exhaust pipe connected to the cylinder of the internal combustion engine and a muffler connected to the exhaust pipe. Existing exhaust devices of internal combustion engines are generally designed in accordance with not affecting the medium and high speed running performance of the internal combustion engine. Therefore, when the internal combustion engine is in a low speed state, the amount of fuel mixture sucked into the cylinder of the internal combustion engine is small, and the speed of the internal combustion engine is low, the overlap time of the intake and exhaust valves is long. Due to the small exhaust back pressure of the exhaust device, it is easy for the exhaust gas in the exhaust device to flow back, reducing the charging efficiency of the cylinder. In some cases, due to the small exhaust back pressure of the exhaust device, the exhaust gas is easy to form a diversion negative pressure in the exhaust device. When the negative pressure in the exhaust device is greater than the negative pressure in the cylinder, the fuel mixture that initially enters the cylinder is easy to enter the exhaust device, resulting in increased fuel consumption or worsening emissions of the internal combustion engine.
[0003] Chinese patent document CN201020595863.5 discloses an exhaust gas purification muffler for an internal combustion engine, comprising: a muffler chamber, which has a muffler cavity inside; an exhaust gas discharge pipe, which extends into the muffler cavity of the muffler chamber; a first catalyst and a second catalyst, which are arranged in sequence along the gas flow direction in the exhaust gas discharge pipe in the muffler cavity; and an air supply channel, which is arranged between the first catalyst and the second catalyst, and the front end of the air supply channel extends into the exhaust gas discharge pipe, wherein the outlet of the air supply channel faces the downstream direction of the exhaust gas flow in the exhaust gas discharge pipe. When the scheme is implemented, due to the bypass principle, the air flow flows along the surface of the air supply channel, and leaves the wall near its vertex (90 degrees), and the separated fluid forms, for example, a pair of fixed symmetrical vortices (attached vortices) downstream of the air supply channel, thereby forming a low pressure zone downstream, so that since the outlet of the air supply channel faces the downstream direction of the exhaust gas flow in the exhaust gas discharge pipe, that is, towards this low pressure zone, it is easy to supply air, improve the exhaust gas environment, improve the conversion efficiency of the catalyst, and then reduce exhaust emissions.
[0004] The above-mentioned prior art improves the emission problem by purifying the exhaust gas, but cannot improve the low-speed performance of the internal combustion engine. Utility Model Content
[0005] The utility model aims to provide an exhaust device for an internal combustion engine to solve the problem of poor low-speed performance of the internal combustion engine in the prior art.
[0006] In order to achieve the above-mentioned purpose, the basic scheme of the utility model provides an exhaust device of an internal combustion engine, including a shell forming an exhaust duct, wherein a flow limiting mechanism for adjusting the effective flow cross-sectional size of the exhaust duct is arranged in the exhaust duct, and the flow limiting mechanism includes a driving mechanism for driving and adjusting according to the rotational speed of the internal combustion engine.
[0007] The beneficial effect of this basic scheme is that: with such a setting, when the speed of the internal combustion engine is low, the flow limiting mechanism adjusts the effective flow cross-section of the exhaust duct to a smaller state. At this time, the exhaust back pressure of the internal combustion engine is large, so that the internal combustion engine can fully inhale fresh fuel mixture and keep the fuel mixture in the cylinder, thereby improving the cylinder charging efficiency, thereby improving the low-speed performance of the internal combustion engine; at the same time, the large exhaust back pressure can reduce the fuel waste caused by part of the fuel mixture in the cylinder entering the exhaust device due to the negative pressure of the exhaust device being greater than the adsorption pressure of the cylinder, thereby reducing fuel consumption; when the speed of the internal combustion engine is high, the flow limiting mechanism adjusts the effective flow cross-section of the exhaust duct to a larger state. At this time, the exhaust back pressure of the internal combustion engine is small, so that the exhaust gas generated by the internal combustion engine can be discharged quickly, thereby avoiding the influence of the flow limiting mechanism on the medium and high-speed performance of the internal combustion engine.
[0008] Preferably, the flow limiting mechanism comprises a flow regulating plate, the flow regulating plate is movably connected to the shell, and the flow regulating plate is connected to the driving mechanism.
[0009] Preferably, the driving mechanism comprises a supporting shaft located in the exhaust passage and rotatably connected to the housing, and the flow regulating plate is statically connected to the supporting shaft.
[0010] Preferably, the driving mechanism further comprises an adjusting disk located outside the housing, and the adjusting disk is statically connected to the supporting shaft.
[0011] Preferably, the adjusting disk is coaxially arranged with the supporting shaft.
[0012] Preferably, a return spring for returning the flow regulating plate is connected to the housing.
[0013] Preferably, the return spring is a tension spring, one end of which is eccentrically connected to the support shaft, and the other end of which is connected to the housing.
[0014] Preferably, a stopper matched with the flow regulating plate is arranged inside the exhaust passage, and the stopper is connected to the shell.
[0015] The utility model has the following beneficial effects:
[0016] The adoption of this solution can effectively improve the performance of the internal combustion engine in the low-speed section while avoiding the impact on the medium and high-speed sections, thereby improving the performance of the entire machine, reducing fuel consumption and optimizing emissions. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a schematic diagram of an embodiment of an exhaust device for an internal combustion engine of the utility model;
[0018] Figure 2 for Figure 1 AA section view;
[0019] Figure 3 for Figure 2 Schematic diagram of the middle exhaust duct when the effective flow cross-section is in a larger state. DETAILED DESCRIPTION
[0020] The following is further described in detail through specific implementation methods:
[0021] The reference numerals in the drawings of the specification include: housing 1, exhaust duct 2, flow regulating plate 3, regulating disk 4, support shaft 5, limit member 6, support plate 7, and return spring 8.
[0022] The embodiment is basically as shown in the attached Figure 1 , Figure 2 and Figure 3 As shown: An exhaust device of an internal combustion engine includes a housing 1 forming an exhaust passage 2, wherein a flow limiting mechanism for adjusting the effective flow cross-section of the exhaust passage 2 is provided in the exhaust passage 2, and the flow limiting mechanism includes a driving mechanism for driving and adjusting according to the rotation speed of the internal combustion engine. In this embodiment, the housing 1 is cylindrical, which is convenient for connection with the exhaust pipe of the internal combustion engine. Of course, the exhaust pipe can also be directly used as the housing 1. Figure 2 and Figure 3 The direction indicated by the arrow is the exhaust direction.
[0023] In this embodiment, the flow limiting mechanism includes a flow regulating plate 3, which is movably connected to the housing 1, and the flow regulating plate 3 is connected to a driving mechanism. Specifically, the driving mechanism includes a support shaft 5 located in the exhaust duct 2 and rotatably connected to the housing 1, and the flow regulating plate 3 is statically connected to the support shaft 5. In this embodiment, the support shaft 5 is arranged perpendicular to the housing 1 and passes through the center of the housing 1. The flow regulating plate 3 is semicircular and is fixedly connected to the support shaft 5, and the relative movement between the flow regulating plate 3 and the housing 1 can be achieved by rotating the support shaft 5.
[0024] The housing 1 is connected with a limiter 6 that cooperates with the flow regulating plate 3, so as to facilitate the positioning of the initial position of the flow regulating plate 3. The driving mechanism also includes an adjusting disk 4 located outside the housing 1, and the adjusting disk 4 is statically connected to the support shaft 5. The adjusting disk 4 is linked with the throttle of the internal combustion engine through a pull wire, so that the size of the effective flow cross-section of the exhaust duct 2 adjusted by the flow regulating plate 3 is positively correlated with the size of the throttle opening, and the size of the throttle opening is positively correlated with the speed of the internal combustion engine. In this embodiment, the adjusting disk 4 is a circular disk and is coaxially arranged with the support shaft 5. A reset spring 8 for resetting the flow regulating plate 3 is connected to the housing 1. In this embodiment, the reset spring 8 is preferably a tension spring and is arranged outside the housing 1, one end of the tension spring is eccentrically connected to the support shaft 5 through the support plate 7, and the other end of the tension spring is connected to the housing 1 through the fixed plate, so as to reduce interference when the tension spring is extended and retracted.
[0025] The specific implementation process is as follows:
[0026] When in use, the housing 1 is connected to the cylinder exhaust port of the internal combustion engine, and the regulating plate 4 is connected to the throttle of the internal combustion engine through a pull line. Initially, the throttle opening is the smallest. At this time, the flow regulating plate 3, under the action of the limiter 6, makes the effective flow cross section of the exhaust passage 2 also in the smallest state (such as Figure 2 As shown). When the speed of the internal combustion engine is at a lower state, the throttle opening is also at a smaller state. At this time, the angle at which the flow regulating plate 3 deviates from the initial position is also relatively small, so that the effective flow cross-section of the exhaust duct 2 is also in a smaller state, so that the exhaust back pressure is relatively large, which is beneficial to improve the charging efficiency of the cylinder of the internal combustion engine, thereby improving the low-speed performance of the internal combustion engine, and can also reduce the fuel mixture in the cylinder from entering the exhaust system, thereby reducing fuel consumption and improving emissions. When the speed of the internal combustion engine is at a higher state, the throttle opening is also in a larger state. At this time, the angle at which the flow regulating plate 3 deviates from the initial position is also relatively large (as shown). Figure 3 As shown in the figure), the effective flow cross section of the exhaust passage 2 is also in a larger state, so that the exhaust back pressure is relatively small, which is conducive to the cylinder of the internal combustion engine to quickly discharge the exhaust gas and ensure the medium and high speed performance of the internal combustion engine. The adoption of this solution can improve the overall performance of the internal combustion engine, reduce fuel consumption, and improve emissions.
[0027] The above is only an embodiment of the utility model, and the common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the utility model, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent.
Claims
1. An exhaust device for an internal combustion engine, comprising a housing forming an exhaust passage, characterized in that: The exhaust passage is provided with a flow limiting mechanism for adjusting the size of the effective flow cross-section of the exhaust passage, and the flow limiting mechanism includes a driving mechanism for driving and adjusting according to the rotation speed of the internal combustion engine.
2. An exhaust device for an internal combustion engine according to claim 1, characterized in that: The flow limiting mechanism comprises a flow regulating plate, the flow regulating plate is movably connected to the shell, and the flow regulating plate is connected to the driving mechanism.
3. An exhaust device for an internal combustion engine according to claim 2, characterized in that: The driving mechanism comprises a supporting shaft located in the exhaust passage and rotatably connected to the housing, and the flow regulating plate is statically connected to the supporting shaft.
4. An exhaust device for an internal combustion engine according to claim 3, characterized in that: The driving mechanism further comprises an adjusting disk located outside the housing, and the adjusting disk is statically connected to the supporting shaft.
5. An exhaust device for an internal combustion engine according to claim 4, characterized in that: The adjusting disk is coaxially arranged with the supporting shaft.
6. An exhaust device for an internal combustion engine according to claim 5, characterized in that: The housing is connected with a reset spring for resetting the flow regulating plate.
7. An exhaust device for an internal combustion engine according to claim 6, characterized in that: The return spring is a tension spring, one end of which is eccentrically connected to the support shaft, and the other end of which is connected to the housing.
8. An exhaust device for an internal combustion engine according to claim 7, characterized in that: A limiting member matched with the flow regulating plate is arranged inside the exhaust passage, and the limiting member is connected to the shell.