Low-pressure cooling EGR (Exhaust Gas Recirculation) system capable of realizing compact arrangement

Abstract

The utility model discloses a low-pressure cooling EGR system achieving compact arrangement, and belongs to the technical field of engines. A gas inlet of the EGR cooler is communicated with a waste gas outlet of the engine, a gas outlet of the EGR cooler is communicated with the EGR valve, the EGR valve is communicated with one passage of the cast three-way pipe, and the other two passages of the cast three-way pipe are respectively communicated with the mixing valve and the turbocharger. According to the low-pressure cooling EGR system, the problem of compact arrangement of the low-pressure cooling EGR system is solved, the EGR system can be tightly integrated, the total volume of an engine compartment occupied by the EGR system is remarkably reduced, space utilization in the engine compartment is optimized, miniaturization of the system is achieved, cost effectiveness is high, operation stability is high, maintenance is easy, and good compatibility and flexibility are achieved; the EGR system can adapt to different types of gasoline engine platforms, efficient cooling, good vibration suppression and maintenance convenience are achieved, the higher EGR rate is achieved, and the EGR flow control precision is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of engines, and in particular relates to a low-pressure cooling EGR system which realizes compact arrangement. Background Art

[0002] In order to achieve better compactness of the engine, low-pressure cooling EGR technology is a very popular application in the field of gasoline engines. Most of them add a secondary exhaust gas recirculation system on the basis of the existing engine platform. In the prior art, the EGR valve and cooler assembly are often designed separately from the air intake and mixing valve of the supercharger. They are connected to each other by hoses, and sufficient assembly space needs to be reserved at both ends of the engine. It occupies a large space and is difficult to adapt to the needs of miniaturization and lightweight of modern engines. Therefore, in order to facilitate the layout, designing a compact low-pressure cooling EGR system is a technical problem that needs to be solved urgently by technical personnel in this field. Utility Model Content

[0003] The utility model aims to provide a low-pressure cooling EGR system with a compact layout, so as to solve the problem of limitations of the existing low-pressure EGR system in terms of miniaturization and compact layout.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is as follows: a low-pressure cooling EGR system with a compact layout, including an EGR cooler, an EGR valve, a cast tee pipe, a mixing valve and a turbocharger, wherein the air inlet of the EGR cooler is connected to the exhaust gas outlet of the engine, the air outlet of the EGR cooler is connected to the EGR valve, the EGR valve is connected to one of the passages of the cast tee pipe, and the other two passages of the cast tee pipe are connected to the mixing valve and the turbocharger respectively.

[0005] Furthermore, the EGR cooler and the EGR valve, and the EGR valve and the cast tee pipe are positioned by the EGR valve positioning pin and directly connected by flanges, the turbocharger and the cast tee pipe are directly connected by flanges, and the cast tee pipe and the mixing valve are directly connected by flanges.

[0006] Furthermore, the casting three-way pipe and the flange of the turbocharger are fixed by bolts, and the casting three-way pipe and the flange of the mixing valve are fixed by bolts.

[0007] Furthermore, the EGR cooler is provided with an EGR cooler fixing bracket 1 and an EGR cooler fixing bracket 2, and the EGR cooler fixing bracket 1 and the EGR cooler fixing bracket 2 are both fixedly connected to the cylinder body of the engine by bolts.

[0008] Furthermore, the cast three-way pipe includes a supercharger intake three-way pipe, a supercharger connecting flange, a supercharger sealing rubber ring, a mixing valve connecting flange, a pressure differential sensor valve rear air intake nozzle and an EGR valve connecting flange. The supercharger intake three-way pipe is a "two-inlet and one-outlet" three-way structure. The two intake ends of the supercharger intake three-way pipe are respectively equipped with a mixing valve connecting flange and an EGR valve connecting flange, and the outlet end of the supercharger intake three-way pipe is equipped with a supercharger connecting flange. A supercharger sealing rubber ring is provided on the outer end surface of the supercharger connecting flange, and the supercharger intake three-way pipe is connected to the pressure differential sensor valve rear air intake nozzle.

[0009] Compared with the prior art, the beneficial effects of the utility model are:

[0010] 1. The integrated and modular design of the utility model solves the problem of compact layout of the low-pressure cooling EGR system, enables the EGR system to be tightly integrated, significantly reduces the total volume of the EGR system occupied by the engine compartment, optimizes the space utilization in the engine compartment, realizes the miniaturization of the system, efficient cooling, good vibration suppression and maintenance convenience, which is conducive to further improving the performance of the engine, reducing emissions and improving fuel economy.

[0011] 2. The utility model reduces the demand for EGR valve layout points, eliminates one installation point of the EGR valve, simplifies the number of system parts, reduces the connecting hoses between the various components of the EGR system, reduces the number of system components, reduces costs and leakage risks, and thus improves the reliability and durability of the entire EGR system. The modular design makes the integration of the EGR valve, EGR cooler, and cast three-way pipe more compact, greatly saving valuable space in the engine compartment, enhancing the rationality of the overall layout of the engine, and meeting the needs of modern engine miniaturization and lightweight; the entire EGR system gas transmission path is very short, which minimizes exhaust gas resistance and ensures exhaust gas transmission efficiency. In addition, due to the shortening of the pipeline, the pressure difference loss is small, a higher EGR rate is achieved, and the EGR flow control accuracy is improved.

[0012] 3. The EGR cooler of the EGR system of the present invention is easy to assemble and disassemble. The EGR valve positioning pin 6 makes it easy to install and position the low-pressure cooling EGR system in a small space. The low-pressure cooling EGR system of the present invention is extremely convenient in installation and maintenance, greatly shortening the installation time and maintenance cycle, and reducing maintenance costs. The EGR system is not only well arranged in a compact space, but also modularly assembled, which is convenient for initial assembly of the whole machine and later maintenance and replacement.

[0013] 4. The low-pressure cooling EGR system of the utility model has a compact structure, high cost-effectiveness, strong operational stability and easy maintenance. It has good compatibility and flexibility, can adapt to different types of gasoline engine platforms, and can be easily and quickly integrated into the existing engine system without too much modification, thereby reducing R&D costs and time costs. Therefore, the utility model not only technically realizes the compact layout of the low-pressure cooling EGR system, but also has significant improvements in practicality, stability, maintenance convenience and compatibility. It has high practical value and broad market application prospects, and fully meets the high standard requirements of modern engines in terms of compact layout and durability. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the connection relationship of the utility model;

[0015] Figure 2 It is a structural schematic diagram of the utility model;

[0016] Figure 3 It is an axonometric drawing of the utility model;

[0017] Figure 4 This is an exploded view of the EGR system module;

[0018] Figure 5 It is a top view of the EGR valve locating pin;

[0019] Figure 6 It is a top view of the EGR cooler;

[0020] Figure 7 It is a structural diagram of a cast tee pipe.

[0021] The names and reference numerals of the components involved in the above drawings are as follows:

[0022] 1. EGR cooler; 2. EGR valve; 3. Casting tee pipe; 4. Mixing valve; 5. Turbocharger; 6. EGR valve locating pin; 7. EGR cooler fixing bracket 1; 8. EGR cooler fixing bracket 2; 9. Supercharger air intake tee pipe; 10. Supercharger connecting flange; 11. Supercharger sealing rubber ring; 12. Mixing valve connecting flange; 13. Pressure difference sensor valve rear air nozzle. DETAILED DESCRIPTION

[0023] The technical solution of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0024] Specific implementation method 1: Figure 1-Figure 6 As shown, this embodiment discloses a low-pressure cooling EGR system that realizes a compact layout, including an EGR cooler 1, an EGR valve 2, a casting tee pipe 3, a mixing valve 4 and a turbocharger 5, wherein the air inlet of the EGR cooler 1 is connected to the exhaust gas outlet of the engine, the air outlet of the EGR cooler 1 is connected to the EGR valve 2, the EGR valve 2 is connected to one of the passages of the casting tee pipe 3, and the other two passages of the casting tee pipe 3 are connected to the mixing valve 4 and the turbocharger 5 respectively.

[0025] Furthermore, the EGR cooler 1 and the EGR valve 2, and the EGR valve 2 and the casting tee pipe 3 are positioned by the EGR valve positioning pin 6 and directly connected by flanges to ensure product accuracy and tolerance, and to minimize the transmission path of the entire EGR system to reduce intake resistance. The turbocharger 5 and the casting tee pipe 3 are directly connected by flanges, and the casting tee pipe 3 and the mixing valve 4 are directly connected by flanges to minimize the transmission path of air entering and mixing with exhaust gas to reduce intake resistance and make the control of the mixing valve 4 more precise. The EGR cooler 1, the EGR valve 2 and the casting tee pipe 3 are all installed by bolts.

[0026] Furthermore, the casting three-way pipe 3 and the flange of the turbocharger 5 are fixed by bolts, and the casting three-way pipe 3 and the flange of the mixing valve 4 are fixed by bolts.

[0027] The exhaust gas after combustion passes through the turbocharger 5, the EGR cooler 1 and the EGR valve 2 in sequence, and then flows through the casting tee pipe 3 together with the fresh air passing through the mixing valve 4 to mix. The mixed gas flows into the turbocharger 5 together to be compressed and increase the pressure.

[0028] The above measures can increase the EGR rate to 25%.

[0029] Furthermore, the EGR cooler 1 is provided with an EGR cooler fixing bracket 1 7 and an EGR cooler fixing bracket 2 8, and both the EGR cooler fixing bracket 1 7 and the EGR cooler fixing bracket 2 8 are fixedly connected to the cylinder block of the engine by bolts to support and fix the low-pressure cooling EGR system.

[0030] Furthermore, the cast three-way pipe 3 includes a supercharger intake three-way pipe 9, a supercharger connecting flange 10, a supercharger sealing rubber ring 11, a mixing valve connecting flange 12, a pressure differential sensor valve rear air intake nozzle 13 and an EGR valve connecting flange 14. The supercharger intake three-way pipe 9 is a "two-inlet and one-outlet" three-way structure. The two intake ends of the supercharger intake three-way pipe 9 are respectively equipped with a mixing valve connecting flange 12 and an EGR valve connecting flange 14, and the outlet end of the supercharger intake three-way pipe 9 is equipped with a supercharger connecting flange 10. The outer end surface of the supercharger connecting flange 10 is provided with a supercharger sealing rubber ring 11, and the supercharger intake three-way pipe 9 is connected to the pressure differential sensor valve rear air intake nozzle 13.

[0031] In the EGR system of the utility model, the EGR valve 2 is tightly integrated with the turbocharger 5 and the mixing valve 4 by adopting an integrated and modular design through a cast tee pipe 3, which greatly reduces the overall size of the system and improves the space utilization.

[0032] The EGR valve 2 and the EGR cooler 1 are integrated with the casting tee pipe 3, and a compact design structure is adopted to ensure that the EGR system can be arranged in a small space, and the pipeline is short and the pressure difference loss is small, which is conducive to achieving a higher EGR rate and improving the EGR flow control accuracy;

[0033] In the EGR system, the EGR valve 2 is directly connected to the turbocharger 5 and the mixing valve 4 through the casting three-way pipe 3, which can effectively support the strength of the fixed EGR valve 2 parts, directly cancel the general three-point fixing scheme of the original EGR system, and change it to only two points to fix the EGR cooler 1.

[0034] The modular system design and disassembly structure make the low-pressure cooling EGR system easy to install and position in a small space, and also facilitate subsequent maintenance and replacement.

[0035] The low-pressure cooling EGR system of the utility model can be flexibly adapted to various engine platforms, and a compact and efficient EGR system layout can be achieved without significantly changing the original engine structure.

[0036] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent conditions of the claims are included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0037] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A low-pressure cooling EGR system with compact layout, characterized in that: The invention comprises an EGR cooler (1), an EGR valve (2), a casting three-way pipe (3), a mixing valve (4) and a turbocharger (5); the air inlet of the EGR cooler (1) is connected to the exhaust gas outlet of the engine; the air outlet of the EGR cooler (1) is connected to the EGR valve (2); the EGR valve (2) is connected to one passage of the casting three-way pipe (3); the other two passages of the casting three-way pipe (3) are respectively connected to the mixing valve (4) and the turbocharger (5); the EGR cooler (1) and the EGR valve (2) and the EGR valve (2) and the casting three-way pipe (3) are positioned by an EGR valve positioning pin (6) and directly connected by flanges; the turbocharger (5) and the casting three-way pipe (3) are directly connected by flanges; the casting three-way pipe (3) and the mixing valve (4) are directly connected by flanges.

2. A low-pressure cooling EGR system with compact layout according to claim 1, characterized in that: The casting three-way pipe (3) and the flange of the turbocharger (5) are fixed by bolts, and the casting three-way pipe (3) and the flange of the mixing valve (4) are fixed by bolts.

3. A low-pressure cooling EGR system with compact layout according to claim 2, characterized in that: The EGR cooler (1) is provided with an EGR cooler fixing bracket 1 (7) and an EGR cooler fixing bracket 2 (8), and the EGR cooler fixing bracket 1 (7) and the EGR cooler fixing bracket 2 (8) are both fixedly connected to the cylinder body of the engine by bolts.

4. A low-pressure cooling EGR system with compact layout according to claim 3, characterized in that: The casting three-way pipe (3) comprises a supercharger air intake three-way pipe (9), a supercharger connecting flange (10), a supercharger sealing rubber ring (11), a mixing valve connecting flange (12), a pressure differential sensor valve rear air intake nozzle (13) and an EGR valve connecting flange (14). The supercharger air intake three-way pipe (9) is a "two-inlet and one-outlet" three-way structure. The two air intake ends of the supercharger air intake three-way pipe (9) are respectively equipped with a mixing valve connecting flange (12) and an EGR valve connecting flange (14). The air outlet end of the supercharger air intake three-way pipe (9) is equipped with a supercharger connecting flange (10). The outer end surface of the supercharger connecting flange (10) is provided with a supercharger sealing rubber ring (11). The supercharger air intake three-way pipe (9) is connected to the pressure differential sensor valve rear air intake nozzle (13).

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