Double-waterway two-section type cooling EGR (Exhaust Gas Recirculation) cooler

By designing a dual-water-path, two-stage cooling EGR cooler, which employs an outer shell, partition plate, and two water passages, efficient cooling is achieved within a compact space. This solves the problem of large space occupation in existing technologies, improves engine cooling efficiency and fuel utilization, and reduces exhaust emissions.

CN223634800UActive Publication Date: 2025-12-05WUXI TRS HEAT EXCHANGER CO LTD
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Patent Information

Application Number
CN202423265988.2
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-12-30
Publication Date
2025-12-05
Estimated Expiration
2034-12-30

AI Technical Summary

Technical Problem

Existing dual-water EGR coolers require a large installation space in compact vehicles and cannot effectively cool and extend engine life.

Method used

Design a dual-water-path, two-stage cooling EGR cooler, which uses an outer shell, a partition plate, and two water paths. The partition plate divides the cooling chamber into two parts, and the exhaust gas is cooled twice in the two water paths, which improves cooling efficiency and reduces space occupation.

Benefits of technology

Improving cooling efficiency within a compact space reduces the temperature of gases entering the engine combustion chamber, increases engine fuel utilization, reduces exhaust emissions, and extends engine life.

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Abstract

The utility model provides a double-waterway two-section type cooling EGR cooler which comprises a hollow cavity formed by peripheral side walls of a shell, an air inlet flange is arranged on the left side of the shell, an air outlet flange is arranged on the right side of the shell, heat exchange tubes are arranged in the cavity at equal intervals, and the heat exchange tubes are arranged at the left end and the right end of the shell in a penetrating mode. The partition plate is arranged on one side of the cavity and divides the left side and the right side of the cavity into a first cooling cavity and a second cooling cavity, the first water way penetrates through the side, close to the air inlet flange, of the top of the shell, and the second water way penetrates through the side, close to the air outlet flange, of the top of the shell. Waste gas in the heat exchange pipe can be cooled twice in sequence through LLC cooling liquid with different temperatures input into the first water way and the second water way and the first cooling cavity and the second cooling cavity which are divided by the partition plate, so that the temperature of gas entering an engine combustion chamber is higher than the heat dissipation efficiency of a one-section cooling EGR cooler; and compared with a two-section heat dissipation mode with two EGR coolers, the occupied space is smaller.
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Description

TECHNICAL FIELD

[0001] The utility model relates to the field of engine EGR (exhaust gas recirculation), especially to the technical field of EGR cooler design, in particular to a double waterway two-section type cooling EGR cooler. BACKGROUND

[0002] With the continuous development of engine technology, the requirements of EGR (exhaust gas recirculation) / C (cooler) system are also evolving, in order to further improve the efficiency of the engine and reduce emissions, more and more advanced EGR / C systems are used in modern engine design, and some engines use double waterway design, which can better adapt to the emission requirements under different working conditions, ensure that the engine can maintain low emission under various conditions, and the more effective cooling of double waterway design can reduce the thermal load of the engine and avoid local overheating, thereby prolonging the service life of the engine, the above-mentioned double waterway engine in the prior art is arranged in two sections, which needs two EGR / C, but this kind of layout requires a very large installation space, which cannot be used in compact vehicles, therefore, a double waterway EGR cooler needs to be designed for compact space. SUMMARY

[0003] In view of the above-mentioned shortcomings of the prior art, the purpose of the utility model is to provide a double waterway two-section type cooling EGR cooler, which solves the difficulties of the prior art.

[0004] To achieve the above-mentioned purpose and other related purposes, the utility model provides a double waterway two-section type cooling EGR cooler, which comprises:

[0005] The shell 1 is composed of a hollow cavity by a peripheral side wall, the left side of the shell 1 is an air inlet flange 11, the air inlet flange 11 is communicated with the engine exhaust pipe, the right side of the shell 1 is an air outlet flange 12, the air outlet flange 12 is connected with the engine air injection pipe;

[0006] The heat exchange pipe 14 is arranged in the cavity at equal intervals, the heat exchange pipe 14 is arranged at the left and right ends of the shell 1, the left side air inlet of the heat exchange pipe 14 is communicated with the air inlet flange 11, and the right side air outlet of the heat exchange pipe 14 is communicated with the air outlet flange 12;

[0007] The partition plate 2 is arranged on one side of the cavity, the partition plate 2 divides the left and right sides of the cavity into a first cooling cavity 21 and a second cooling cavity 22 respectively, and the partition plate 2 is connected with the shell 1 through welding around;

[0008] The first waterway 3 is arranged at the top of the shell 1 near the side of the air inlet flange 11;

[0009] The second waterway 4 is arranged on the top of the shell 1 near the side of the air outlet flange 12.

[0010] According to the preferred embodiment, the length of the first cooling cavity 21 is greater than the length of the second cooling cavity 22.

[0011] According to the preferred embodiment, the air inlet flange 11 and the air outlet flange 12 are arranged near the side of the partition plate 2 and are provided with a sealing fixed plate 13.

[0012] According to the preferred embodiment, the first waterway 3 comprises:

[0013] The first water inlet groove 31 is arranged on the top of the shell 1 near the air inlet flange 11.

[0014] The water inlet cover 32 is arranged on the top of the shell 1 outside the first water inlet groove 31 by welding, and the top of the water inlet cover 32 is tapered.

[0015] The L-shaped water inlet pipe 33 is arranged on the side of the top of the water inlet cover 32 by welding.

[0016] The first water outlet hole 34 is arranged on the top of the shell 1 near the side of the partition plate 2.

[0017] The first water outlet pipe 35 is arranged in the first water outlet hole 34 by welding.

[0018] According to the preferred embodiment, the bottom of the first water inlet groove 31 and the first water outlet hole 34 is communicated with the first cooling cavity 21.

[0019] According to the preferred embodiment, the second waterway 4 comprises:

[0020] The second water inlet hole 41 is arranged on the top of the shell 1 away from the first water outlet hole 34.

[0021] The second water inlet pipe 42 is arranged in the second water inlet hole 41 by welding.

[0022] The second water outlet groove 43 is arranged on the top of the shell 1 away from the water inlet cover 32 and the second water inlet hole 41.

[0023] The water outlet water collecting cover 44 is arranged on the top of the shell 1 outside the second water outlet groove 43 by welding, and the second water outlet pipe 45 is arranged on the top of the water outlet water collecting cover 44.

[0024] According to the preferred embodiment, the bottom of the second water inlet hole 41 and the second water outlet groove 43 is communicated with the second cooling cavity 22.

[0025] The utility model discloses a shell 1, partition, primary waterway and secondary waterway adopt, and the flange of one side air inlet of double waterway two -section type cooling EGR cooler is communicated with the engine exhaust pipe, and the flange of the other side air outlet is connected with the engine injection pipe, and the exhaust gas in the engine is reimported into the engine combustion chamber after heat exchange pipe heat exchange cooling, improves the engine fuel utilization rate, reduces the automobile exhaust emission, still need to explain that the L type water inlet pipe, primary water outlet pipe and secondary water inlet pipe, secondary water outlet pipe in the primary waterway of double waterway two -section type cooling EGR cooler are communicated with the engine two waterways, make the exhaust gas in heat exchange pipe can be cooled by LLC coolant of different temperature inputted in primary waterway and secondary waterway, and the exhaust gas in heat exchange pipe can be cooled by LLC coolant of different temperature inputted in primary waterway and secondary waterway, and the gas temperature entering the engine combustion chamber is higher than the heat dissipation efficiency of one -section type cooling EGR cooler, and the two -section type heat dissipation of comparative setting two EGR coolers occupies the space smaller.

[0026] In the following, the optimal embodiments implementing the utility model will be described in more detail in conjunction with the drawings, so that the features and advantages of the utility model can be easily understood. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is shown as the three-dimensional structure schematic diagram of the utility model;

[0028] Figure 2 It is shown as the explosion diagram of the utility model;

[0029] Figure 3 It is shown as the heat dissipation effect comparison table of the utility model and the single -section cooling EGR cooler of the same length and the same heat exchange area;

[0030] REFERENCE NUMERALS

[0031] 1, shell;11, air inlet flange;12, air outlet flange;13, sealing fixed plate;14, heat exchange pipe;

[0032] 2, partition;21, primary cooling cavity;22, secondary cooling cavity;

[0033] 3, primary waterway;31, primary water inlet groove;32, water inlet cover;33, L type water inlet pipe;34, primary water outlet hole;35, primary water outlet pipe;

[0034] 4, secondary waterway;41, secondary water inlet hole;42, secondary water inlet pipe;43, secondary water outlet groove;44, water outlet water collecting cover;45, secondary water outlet pipe; DETAILED DESCRIPTION

[0035] In order to make the technical scheme of the utility model, the technical scheme and the advantages of the utility model more clear, the following will combine the drawings of the specific embodiments of the utility model to make a clear and complete description of the technical scheme of the embodiments of the utility model. The same reference signs in the drawings represent the same parts. It should be noted that the described embodiments are part of the embodiments of the utility model, not all the embodiments. Based on the described embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0036] Compared with the embodiments shown in the drawings, the feasible implementation schemes within the protection scope of the utility model can have fewer components, other components not shown in the drawings, different components, differently arranged components or differently connected components, etc. In addition, two or more components in the drawings can be implemented in a single component, or a single component shown in the drawings can be implemented as a plurality of separate components.

[0037] Unless otherwise defined, the technical terms or scientific terms used herein should be understood as the usual meaning understood by those skilled in the art to which the utility model belongs. The "first", "second" and similar words used in the utility model patent application specification and claims do not represent any order, quantity or importance, but are only used to distinguish different components. Similarly, "one" or "a" and similar words do not necessarily represent a quantity limit. "Include" or "contain" and similar words mean that the elements or objects before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connected" or "connected" and similar words are not limited to physical or mechanical connection, but can include electrical connection, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to represent the relative positional relationship, when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0038] The utility model provides a kind of two-section type cooling EGR cooler of double waterway, for EGR cooler design process, the shell 1 of the utility model, partition 2, primary waterway 3 and secondary waterway 4 structure are particularly suitable for being set into two sections cooling EGR cooler to improve the cooling efficiency of EGR cooler.

[0039] Generally, the two-section type cooling EGR cooler of double waterway proposed in the utility model mainly includes: shell 1, partition 2, primary waterway 3 and secondary waterway 4. Among them, referring to Figure 1 It shows the arrangement relationship of shell 1, partition 2, primary waterway 3 and secondary waterway 4.

[0040] The utility model discloses a double water route two -section type cooling EGR cooler implementation, with the engine exhaust pipe to the one side air inlet flange 11 of double water route two -section type cooling EGR cooler, with the engine injection pipe to the other side air outlet flange 12, the engine exhaust gas is reimported into the engine combustion chamber after heat exchange pipe 14 heat exchange cooling, improves engine fuel utilization rate, reduces automobile exhaust emission, still need to explain that the L type water inlet pipe 33, the first water pipe 35 in the first water route 3 in double water route two -section type cooling EGR cooler, the second water inlet pipe 42, the second water pipe 45 in the second water route 4 are communicated with the engine two water routes, make the exhaust gas in heat exchange pipe 14 can be through the LLC coolant of different temperature input in the first water route 3 and the second water route 4, and the exhaust gas is cooled twice in the first cooling cavity 21 and the second cooling cavity 22 separated by partition plate 2 in proper order, and the gas temperature of the engine combustion chamber is lower than the temperature of the EGR cooler of one -section cooling.

[0041] According to Figure 3 As shown in the utility model discloses a double water route two -section type cooling EGR cooler and the single -section cooling EGR cooler of the length and heat exchange area of communicating also same are compared to the heat dissipation effect, and the high-temperature exhaust gas of 700 DEG C of the flow rate of 3.5kg / min, 4.0kg / min and 4.5kg / min is sequentially communicated in heat exchange pipe 14 of double water route two -section type cooling EGR cooler and traditional single -section cooling EGR cooler, the temperature of LLC coolant in the first water route 3 in the utility model is set to 80 DEG C and the flow rate is controlled to 60L / min, the temperature of LLC coolant in the second water route 4 is set to 40 DEG C and the flow rate is controlled to 10L / min, the temperature of LLC coolant in traditional EGR cooler is set to 80 DEG C and the flow rate is controlled to 60L / min, after 3 times test, the double water route two -section type cooling EGR cooler of the utility model is compared with traditional single -section cooling EGR cooler and the average difference is 20 DEG C, can show that the double water route two -section type cooling EGR cooler of the utility model is higher than the heat dissipation efficiency of traditional EGR cooler in the compact space.

[0042] The above-mentioned shell 1 is composed of a hollow cavity by four peripheral side walls, the left side of shell 1 is air inlet flange 11, air inlet flange 11 is communicated with engine exhaust pipe, the right side of shell 1 is air outlet flange 12, air outlet flange 12 is connected with engine injection pipe, heat exchange pipe 14 is arranged in the cavity at equal intervals, heat exchange pipe 14 is arranged at the left and right ends of shell 1, the left side of heat exchange pipe 14 is communicated with air inlet flange 11, the right side of heat exchange pipe 14 is communicated with air outlet flange 12, partition plate 2 is arranged on one side of the cavity, partition plate 2 divides the left and right sides of the cavity into first cooling cavity 21 and second cooling cavity 22 respectively, and partition plate 2 is connected with shell 1 by welding around.

[0043] The first waterway 3 is arranged on the top of the shell 1 near the air inlet flange 11. The first waterway 3 comprises a first water inlet groove 31, a water inlet cover 32, an L-shaped water inlet pipe 33, a first water outlet hole 34 and a first water outlet pipe 35. The first water inlet groove 31 is arranged on the top of the shell 1 near the air inlet flange 11. The water inlet cover 32 is arranged on the top of the shell 1 outside the first water inlet groove 31 by welding. The top of the water inlet cover 32 is conical. The L-shaped water inlet pipe 33 is arranged on the top of the water inlet cover 32 by welding. The cooling liquid in the water inlet cover 32 forms a vortex and enters the first cooling cavity 21 quickly. The first water outlet hole 34 is arranged on the top of the shell 1 near the partition plate 2. The first water inlet groove 31 and the bottom of the first water outlet hole 34 are communicated with the first cooling cavity 21. The first water outlet pipe 35 is arranged in the first water outlet hole 34 by welding.

[0044] The second waterway 4 is arranged on the top of the shell 1 near the air outlet flange 12. The second waterway 4 comprises a second water inlet hole 41, a second water inlet pipe 42, a second water outlet groove 43, a water outlet collecting cover 44 and a second water outlet pipe 45. The second water inlet hole 41 is arranged on the top of the shell 1 far from the first water outlet hole 34. The second water outlet groove 43 is arranged on the top of the shell 1 far from the water inlet cover 32 and the second water inlet hole 41. The bottom of the second water inlet hole 41 and the second water outlet groove 43 are communicated with the second cooling cavity 22. The second water inlet pipe 42 is arranged in the second water inlet hole 41 by welding. The water outlet collecting cover 44 is arranged on the top of the shell 1 outside the second water outlet groove 43 by welding. The second water outlet pipe 45 is arranged on the top of the water outlet collecting cover 44. The second water outlet groove 43 has a higher water outlet efficiency than the water outlet hole with the same water outlet area, so that the pressure drop in the second waterway 4 can be reduced.

[0045] The above embodiments only exemplarily illustrate the principles and effects of the present application, and are not used to limit the present application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought of the present application should be covered by the claims of the present application.

Claims

1. A two-pass cooling EGR cooler with dual water circuits, characterized by, The utility model relates to a kind of cooling device of engine exhaust pipe, including: Shell (1), the shell (1) is composed of four perimeter side wall hollow cavity, the left side of shell (1) is air inlet flange (11), air inlet flange (11) is communicated with engine exhaust pipe, the right side of shell (1) is air outlet flange (12), air outlet flange (12) is connected with engine injection pipe; Heat exchange pipe (14), heat exchange pipe (14) is arranged at equal intervals in cavity, heat exchange pipe (14) is arranged at both ends of shell (1), the left side of heat exchange pipe (14) air inlet is communicated with air inlet flange (11), the right side of heat exchange pipe (14) air outlet is communicated with air outlet flange (12); Partition plate (2), partition plate (2) is arranged in cavity side, partition plate (2) is divided into No. cooling cavity (21) and No. cooling cavity (22) respectively by partition plate (2) left and right sides, partition plate (2) is connected with shell (1) by welding around; No. waterway (3), no. waterway (3) is arranged at the top of shell (1) near air inlet flange (11) side; No. waterway (4), no. waterway (4) is arranged at the top of shell (1) near air outlet flange (12) side.

2. The dual-waterpath two-stage cooling EGR cooler of claim 1, wherein, The length of the first cooling cavity (21) is greater than the length of the second cooling cavity (22).

3. The dual-waterpath two-stage cooling EGR cooler of claim 2, wherein, The air inlet flange (11) and the air outlet flange (12) are provided with a sealing fixed plate (13) near the side of the partition plate (2).

4. The dual-waterpath two-stage cooling EGR cooler of claim 3, wherein, The no. waterway (3) comprises: No. water inlet groove (31), the no. water inlet groove (31) is arranged at the top of the shell (1) near the air inlet flange (11) side; Water inlet cover (32), the water inlet cover (32) is arranged at the top of the shell (1) outside the no. water inlet groove (31) by welding, and the top of the water inlet cover (32) is conical; L-shaped water inlet pipe (33), the L-shaped water inlet pipe (33) is arranged at the top of the water inlet cover (32) side inclined surface by welding; No. water outlet hole (34), the no. water outlet hole (34) is arranged at the top of the shell (1) near the partition plate (2) side; No. water outlet pipe (35), the no. water outlet pipe (35) is arranged in the no. water outlet hole (34) by welding.

5. The dual-waterpath two-stage cooling EGR cooler of claim 4, wherein, The bottom of the no. water inlet groove (31) and the no. water outlet hole (34) is communicated with the first cooling cavity (21).

6. The dual-waterpath two-stage cooling EGR cooler of claim 5, wherein, The no. waterway (4) comprises: No. water inlet hole (41), the no. water inlet hole (41) is arranged at the top of the shell (1) away from the no. water outlet hole (34) side of the partition plate (2); No. water inlet pipe (42), the no. water inlet pipe (42) is arranged in the no. water inlet hole (41) by welding; No. water outlet groove (43), the no. water outlet groove (43) is arranged at the top of the shell (1) away from the water inlet cover (32) and the no. water inlet hole (41) side; Water outlet water collecting cover (44), the water outlet water collecting cover (44) is arranged at the top of the shell (1) outside the no. water outlet groove (43) by welding, and the top of the water outlet water collecting cover (44) is provided with a no. water outlet pipe (45).

7. The dual-waterpath two-stage cooling EGR cooler of claim 6, wherein, The second water inlet hole (41) and the bottom of the second water outlet groove (43) are communicated with the second cooling cavity (22).