Arrangement structure of engine EGR (exhaust gas recirculation) system
By adding a mesh diversion structure at the intake end of the intake manifold, the problem of large pressure loss and low EGR rate after the EGR outlet pipe is eliminated, and the EGR uniformity and combustion uniformity are improved.
Patent Information
- Application Number
- CN202421208263.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-05
- Publication Date
- 2025-03-11
- Estimated Expiration
- 2035-02-05
AI Technical Summary
After the EGR outlet pipe is cancelled, the pressure loss of the EGR system is too large, resulting in a low EGR rate, large temperature differences in EGR system, and it is easy to coke. At the same time, EGR uniformity and combustion uniformity are also affected.
Add a mesh flow guide structure to the intake end of the intake manifold, and the waste gas is dispersed and diverted through the design of the deflector and the flow guide hole, reducing the pressure loss of the EGR system.
After the EGR outlet pipe was cancelled, the pressure loss of the EGR system decreased, the EGR rate increased, the fuel consumption decreased, and the EGR uniformity and combustion uniformity were also improved.
Smart Images
Figure CN222596188U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of engines, in particular to an engine EGR system arrangement structure. Background Art
[0002] EGR is the abbreviation of Exhaust Gas Re-circulation. Exhaust gas recirculation refers to returning part of the exhaust gas discharged by the engine to the intake manifold and re-entering the cylinder together with the fresh mixed gas. Since the exhaust gas contains a large amount of polyatomic gases such as CO2, which cannot be burned but absorbs a large amount of heat due to its high specific heat capacity, the maximum combustion temperature of the mixed gas in the cylinder is reduced, thereby reducing the amount of NOx generated.
[0003] In the existing engine EGR system, the exhaust gas passes through the EGR cooler and the EGR valve, and then enters the intake manifold component through the EGR outlet pipe. Due to the long pipeline, the EGR system has excessive pressure loss, low EGR rate, large temperature difference in the EGR system, and is prone to coking. Directly eliminating the EGR outlet pipe will lead to poor EGR uniformity and uneven combustion.
[0004] Therefore, how to ensure EGR uniformity and combustion uniformity after eliminating the EGR outlet pipe is a technical problem that needs to be solved urgently. Utility Model Content
[0005] In view of this, the utility model provides an engine EGR system layout structure, and a mesh guide structure is added to the intake end of the intake manifold, so that after the EGR outlet pipe is eliminated, the pressure loss of the EGR system is reduced, the engine EGR rate can be increased, the engine fuel consumption can be reduced, and the EGR uniformity and combustion uniformity can be improved.
[0006] The utility model provides an engine EGR system arrangement structure adopting the following technical solution:
[0007] An engine EGR system layout structure includes an EGR cooler, an EGR valve and an intake manifold, wherein the intake end of the EGR cooler is used to connect the exhaust gas, and the outlet end is used to connect with the intake end of the EGR valve, the outlet end of the EGR valve is connected with the intake end of the intake manifold, the intake end of the intake manifold is provided with a guide plate, and the guide plate is provided with guide holes, the exhaust gas passes through the EGR cooler and the EGR valve and flows into the intake manifold through the guide holes of the guide plate, and the guide holes are used to disperse and guide the exhaust gas passing through the guide plate.
[0008] Optionally, the guide holes are distributed in a plurality of groups along the radial direction of the guide plate, and the guide holes in adjacent groups have different apertures.
[0009] Optionally, the ratio of the opening area of the guide hole to the cross-sectional area of the guide plate is in the range of 55-65%.
[0010] Optionally, the cross-section of the guide plate is circular.
[0011] Optionally, the guide holes include guide hole one, guide hole two and guide hole three which are radially distributed on the guide plate, the guide hole one is arranged at the axis center of the guide plate, the guide hole two is located between the guide hole one and the guide hole three, and a plurality of the guide holes two and the guide holes three are spaced apart along the circumference of the guide plate.
[0012] Optionally, the diameters of the guide hole 1, the guide hole 2 and the guide hole 3 increase sequentially.
[0013] Optionally, the aperture range of the guide hole 1 is 0.9-1.2 mm, the aperture range of the guide hole 2 is 2.5-3.5 mm, and the aperture range of the guide hole 3 is 4.5-5.5 mm.
[0014] Optionally, the EGR valve is connected to the intake manifold flange, and the guide vane is arranged in the flange.
[0015] To sum up, the utility model includes at least one of the following beneficial technical effects: adding a mesh guide structure at the intake end of the intake manifold can reduce the pressure loss of the EGR system after eliminating the EGR outlet pipe, thereby increasing the engine EGR rate, reducing engine fuel consumption, and improving EGR uniformity and combustion uniformity. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the utility model;
[0017] Figure 2 It is a structural schematic diagram of an EGR cooler and an EGR valve according to an embodiment of the utility model;
[0018] Figure 3 It is a structural schematic diagram of a guide plate according to an embodiment of the utility model.
[0019] Explanation of the reference numerals: 1. EGR cooler; 2. EGR valve; 3. Intake manifold; 4. Guide vane; 5. Guide hole one; 6. Guide hole two; 7. Guide hole three; 8. Flange. DETAILED DESCRIPTION
[0020] The following is combined with Figure 1-3 The utility model is described in further detail.
[0021] The utility model embodiment discloses an engine EGR system arrangement structure.
[0022] Reference Figure 1 , Figure 2 , Figure 3 An engine EGR system arrangement structure includes an EGR cooler 1, an EGR valve 2 and an intake manifold 3. The intake end of the EGR cooler 1 is used to connect the exhaust gas, and the outlet end is used to connect with the intake end of the EGR valve 2. The outlet end of the EGR valve 2 is connected with the intake end of the intake manifold 3. The intake end of the intake manifold 3 is provided with a guide plate 4, and a guide hole is opened on the guide plate 4. The exhaust gas passes through the EGR cooler 1 and the EGR valve 2 and flows into the intake manifold 3 through the guide hole of the guide plate 4. The guide hole is used to disperse and guide the exhaust gas passing through the guide plate 4. Adding a mesh guide structure at the intake end of the intake manifold 3 can reduce the pressure loss of the EGR system after the EGR outlet pipe is cancelled, which can increase the engine EGR rate, reduce the engine fuel consumption, and improve the EGR combustion uniformity.
[0023] In this embodiment, the air inlet end of the EGR cooler 1 is used to connect the exhaust gas, and the air outlet end is used to connect with the air inlet end of the EGR valve 2. The EGR cooler 1 is a water-cooled heat exchanger, and its main function is to further reduce the temperature of the exhaust gas involved in the recirculation, thereby further reducing the maximum combustion peak temperature. In this embodiment, the EGR cooler 1 adopts the EGR cooler 1 of the prior art, which will not be described in detail here.
[0024] In this embodiment, the EGR valve 2 is used to control the amount of exhaust gas recirculation fed back to the intake system. Its main purpose is to reduce the combustion chamber temperature, improve the engine working efficiency, improve the combustion environment, reduce the engine burden, effectively reduce NO compound emissions, and extend the service life of various components by introducing the exhaust gas generated by engine combustion into the intake manifold 3. In addition, the EGR valve 2 is also used to reduce the emission of harmful substances in automobile exhaust and improve engine efficiency. In this embodiment, the EGR valve 2 adopts the EGR valve 2 of the prior art, which will not be described in detail here.
[0025] In this embodiment, the intake manifold 3 is an important part of the engine. The intake manifold 3 refers to the intake pipeline from the carburetor or throttle body to the cylinder head intake passage. Its function is to distribute the air and fuel mixture from the carburetor or throttle body to the intake passages of each cylinder. In this embodiment, the intake manifold 3 adopts the intake manifold 3 of the prior art, which will not be described in detail here.
[0026] In this embodiment, the EGR valve 2 is connected to the intake manifold 3 by a flange 8, and the guide plate 4 is arranged in the flange 8. Specifically, a flange 81 is arranged at the outlet end of the EGR valve 2, and a flange 82 is arranged at the intake end of the intake manifold 3. The flange 81 and the flange 82 are fixedly connected by bolts, so that the EGR valve 2 and the intake manifold 3 are fixed together. A circular hole is opened at the axial position of the flange 8 as a gas flow channel, so that the exhaust gas can enter the intake manifold 3 through the gas flow channel.
[0027] In this embodiment, the cross section of the guide vane 4 is circular. The outer contour of the guide vane 4 is fixedly arranged on the inner wall of the circular hole of the flange 8. The guide vane 4 can be arranged in the flange 8 of the EGR valve 2, in the flange 8 of the intake manifold 3, or at the connection between the two flanges 8. The guide vane 4 has a mesh guide structure, which can improve the uniformity of the cross-sectional airflow.
[0028] In this embodiment, there are multiple groups of guide holes distributed along the radial direction of the guide plate 4, and the apertures of adjacent groups of guide holes are different. Specifically, the guide holes include guide hole 1 5, guide hole 2 6 and guide hole 3 7 distributed radially of the guide plate 4, the guide hole 1 5 is arranged at the axis of the guide plate 4, the guide hole 2 6 is located between the guide hole 1 and the guide hole 3 7, and multiple guide holes 2 6 and guide holes 3 7 are arranged at intervals along the circumference of the guide plate 4. The specific number of settings is set according to the actual product requirements. Specifically, one guide hole 1 5 is set, five guide holes 2 are set, and eight guide holes 3 7 are set.
[0029] In this embodiment, the aperture of the guide hole 1 5 is in the range of 0.9-1.2 mm, the aperture of the guide hole 2 6 is in the range of 2.5-3.5 mm, and the aperture of the guide hole 3 7 is in the range of 4.5-5.5 mm. Specifically, the aperture of the guide hole 1 5 is 1 mm, the aperture of the guide hole 2 6 is 3 mm, and the aperture of the guide hole 3 7 is 5 mm. The apertures of the guide hole 1 5, the guide hole 2 6 and the guide hole 3 7 increase in sequence, wherein the guide hole 1 5 is located in the middle of the guide plate 4, and the intermediate gas flow rate is fast, so the aperture is small, which can break up the intermediate gas and prevent most of the gas from entering the intake manifold 3 from the position of the guide hole 1 5. The gas flow rate is slower the closer to the wall, so the aperture of the guide hole 2 6 is larger than the aperture of the guide hole 1 5, and the aperture of the guide hole 3 7 is larger than the aperture of the guide hole 2 6. The number of the guide hole 1 5, the guide hole 2 6 and the guide hole 3 7 also increases in sequence. The above design can improve the uniformity of the cross-sectional airflow, effectively avoid the problems of poor EGR uniformity, uneven combustion, large temperature differences in the EGR system, and easy coking.
[0030] In this embodiment, the ratio of the opening area of the guide hole to the cross-sectional area of the guide plate 4 is in the range of 55-65%. The specific area ratio is set according to actual product requirements. In this embodiment, the area ratio is 60%.
[0031] The utility model eliminates the need for a traditional EGR outlet pipe by providing the guide vane 4, thereby reducing the pressure loss of the EGR system, improving the engine EGR rate, reducing the engine fuel consumption, reducing the temperature difference of the EGR system and reducing the cost.
[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.
Claims
1. An engine EGR system arrangement structure, characterized in that: It includes an EGR cooler, an EGR valve and an intake manifold, wherein the intake end of the EGR cooler is used to connect the exhaust gas, and the outlet end is used to connect with the intake end of the EGR valve, the outlet end of the EGR valve is connected with the intake end of the intake manifold, and the intake end of the intake manifold is provided with a guide plate, and the guide plate is provided with guide holes. The exhaust gas passes through the EGR cooler and the EGR valve and flows into the intake manifold through the guide holes of the guide plate, and the guide holes are used to disperse and guide the exhaust gas passing through the guide plate.
2. The engine EGR system arrangement structure according to claim 1, characterized in that: The guide holes are distributed in multiple groups along the radial direction of the guide plate, and the guide holes in adjacent groups have different apertures.
3. The engine EGR system arrangement structure according to claim 1, characterized in that: The ratio of the opening area of the guide hole to the cross-sectional area of the guide plate is in the range of 55-65%.
4. The engine EGR system arrangement structure according to claim 2, characterized in that: The cross section of the guide plate is circular.
5. The engine EGR system arrangement structure according to claim 4, characterized in that: The guide holes include guide hole one, guide hole two and guide hole three distributed along the radial direction of the guide plate. The guide hole one is arranged at the axis of the guide plate, the guide hole two is located between the guide hole one and the guide hole three, and a plurality of guide holes two and guide holes three are arranged at intervals along the circumference of the guide plate.
6. The engine EGR system arrangement structure according to claim 5, characterized in that: The apertures of the first guide hole, the second guide hole and the third guide hole increase in sequence.
7. The engine EGR system arrangement structure according to claim 6, characterized in that: The aperture range of the guide hole 1 is 0.9-1.2 mm, the aperture range of the guide hole 2 is 2.5-3.5 mm, and the aperture range of the guide hole 3 is 4.5-5.5 mm.
8. The engine EGR system arrangement structure according to claim 1, characterized in that: The EGR valve is connected to the intake manifold flange, and the guide plate is arranged in the flange.