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

Abstract

The invention 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 pipes are arranged in the cavity at equal intervals, and the heat exchange pipes 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.

Description

Technical Field

[0001] The invention relates to the field of engine EGR (exhaust gas recirculation), in particular to the technical field of EGR cooler design, and specifically to a double-water-path two-stage cooling EGR cooler. Background Art

[0002] With the continuous development of engine technology, the requirements for EGR (exhaust gas recirculation) / C (cooler) systems are also constantly evolving. In order to further improve the efficiency of the engine and reduce emissions, advanced EGR / C systems are increasingly being used in modern engine designs, some of which use a dual water path design. The dual water path design can better adapt to the emission requirements under different working conditions, ensuring that the engine can maintain low emissions under various conditions, and the more effective cooling of the dual water path design can reduce the thermal load of the engine and avoid local overheating, thereby extending the service life of the engine. In the prior art, the above-mentioned dual water path engine will have a two-stage cooling layout, requiring two EGR / Cs, but this layout has very large requirements for the installation space and cannot be used on compact vehicles. For this reason, it is necessary to design a dual water path EGR cooler for compact space. Summary of the invention

[0003] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a dual-water-path two-stage cooling EGR cooler to solve the difficulties of the prior art.

[0004] To achieve the above objectives and other related objectives, the present invention provides a dual-water-path two-stage cooling EGR cooler, comprising:

[0005] A housing 1, wherein the housing 1 is a hollow cavity formed by surrounding side walls, the left side of the housing 1 is an air inlet flange 11, the air inlet flange 11 is communicated with the engine exhaust pipe, and the right side of the housing 1 is an air outlet flange 12, the air outlet flange 12 is connected to the engine air injection pipe;

[0006] Heat exchange tubes 14 are arranged in equal intervals in the cavity. The heat exchange tubes 14 are passed through the left and right ends of the shell 1. The left air inlet of the heat exchange tube 14 is connected to the air inlet flange 11, and the right air outlet of the heat exchange tube 14 is connected to the air outlet flange 12.

[0007] A partition plate 2, 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, and the partition plate 2 is connected to the housing 1 by welding on all sides;

[0008] A first water channel 3, the first water channel 3 is arranged on one side of the top of the housing 1 close to the air inlet flange 11;

[0009] The second water channel 4 is arranged on one side of the top of the housing 1 close to the air outlet flange 12 .

[0010] According to a preferred solution, the length of the first cooling chamber 21 is greater than the length of the second cooling chamber 22 .

[0011] According to a preferred embodiment, a sealing fixing plate 13 is provided on one side of the air inlet flange 11 and the air outlet flange 12 close to the partition plate 2 .

[0012] According to the preferred solution, the first waterway 3 includes:

[0013] A first water inlet tank 31, which is disposed on one side of the top of the housing 1 close to the air inlet flange 11;

[0014] A water inlet cover 32, which is welded and arranged on the top of the housing 1 and outside the first water inlet tank 31, and the top of the water inlet cover 32 is conical;

[0015] An L-shaped water inlet pipe 33, which is welded and passed through an inclined surface on one side of the top of the water inlet cover 32;

[0016] A first water outlet 34, which is provided on the top of the housing 1 and close to the partition plate 2;

[0017] The first water outlet pipe 35 is welded and penetrates the first water outlet hole 34 .

[0018] According to a preferred embodiment, the bottoms of the No. 1 water inlet groove 31 and the No. 1 water outlet hole 34 are connected to the No. 1 cooling chamber 21 .

[0019] According to the preferred solution, the second waterway 4 includes:

[0020] A second water inlet hole 41, which is provided at the top of the housing 1 and located on a side of the partition plate 2 away from the first water outlet hole 34;

[0021] A second water inlet pipe 42, the second water outlet pipe 45 is welded and penetrated into the second water inlet hole 41;

[0022] A second water outlet trough 43, wherein the second water outlet trough 43 is provided at a side of the top of the housing 1 away from the water inlet cover 32 and the second water inlet hole 41;

[0023] The water outlet collecting cover 44 is welded and arranged at the top of the shell 1 and outside the second water outlet trough 43 . The top of the water outlet collecting cover 44 is provided with a second water outlet pipe 45 .

[0024] According to a preferred embodiment, the bottom of the No. 2 water inlet hole 41 and the No. 2 water outlet trough 43 are in communication with the No. 2 cooling chamber 22 .

[0025] The present invention adopts a shell 1, a partition plate, a first water channel and a second water channel, and connects the air inlet flange on one side of the dual-water-channel two-stage cooling EGR cooler with the engine exhaust pipe, and connects the air outlet flange on the other side with the engine injection pipe, so that the exhaust gas in the engine is cooled by heat exchange in the heat exchange tube and then re-enters the engine combustion chamber, thereby improving the fuel utilization rate of the engine and reducing automobile exhaust emissions. It should also be noted that the L-shaped water inlet pipe and the first water outlet pipe in the first water channel and the second water inlet pipe and the second water outlet pipe in the second water channel in the dual-water-channel two-stage cooling EGR cooler are connected with the two water channels of the engine, so that the exhaust gas in the heat exchange tube can pass through the LLC coolant of different temperatures input into the first water channel and the second water channel, and the first cooling chamber and the second cooling chamber separated by the partition plate are cooled twice in succession, so that the temperature of the gas entering the engine combustion chamber is higher than that of the one-stage cooling EGR cooler with higher heat dissipation efficiency, and compared with the two-stage heat dissipation with two EGR coolers, the space occupied is smaller.

[0026] The best embodiment for carrying out the present invention will be described in more detail below with reference to the accompanying drawings so that the features and advantages of the present invention can be easily understood. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 Shown is a schematic diagram of the three-dimensional structure of the present invention;

[0028] Figure 2 Shown is an exploded view of the present invention;

[0029] Figure 3 Shown is a comparison table of heat dissipation effects of the present invention and a single-stage cooling EGR cooler of the same length and heat exchange area;

[0030] Description of symbols

[0031] 1. Shell; 11. Air inlet flange; 12. Air outlet flange; 13. Sealing fixing plate; 14. Heat exchange tube;

[0032] 2. Partition plate; 21. Cooling chamber No. 1; 22. Cooling chamber No. 2;

[0033] 3. Water channel No. 1; 31. Water inlet trough No. 1; 32. Water inlet cover; 33. L-shaped water inlet pipe; 34. Water outlet No. 1; 35. Water outlet pipe No. 1;

[0034] 4. No. 2 waterway; 41. No. 2 water inlet hole; 42. No. 2 water inlet pipe; 43. No. 2 water outlet trough; 44. Water outlet water collecting cover; 45. No. 2 water outlet pipe; DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the technical solution of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described in conjunction with the drawings of specific embodiments of the present invention. The same figure marks in the drawings represent the same parts. It should be noted that the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] Compared to the embodiments shown in the drawings, feasible embodiments within the scope of the present invention may 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 may be implemented in a single component, or a single component shown in the drawings may be implemented as multiple separate components.

[0037] Unless otherwise defined, the technical terms or scientific terms used herein shall have the usual meanings understood by persons of ordinary skill in the field to which the present invention belongs. The words "first", "second" and similar words used in the patent application specification and claims of the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "one" do not necessarily indicate a quantity limitation. Words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0038] The present invention proposes a dual-water-path two-stage cooling EGR cooler, which is used in the EGR cooler design process. The structure of the shell 1, the partition plate 2, the first water path 3 and the second water path 4 in the utility model is particularly suitable for setting the EGR cooler into two-stage cooling to improve the cooling efficiency of the EGR cooler.

[0039] In general, the dual-water-path two-stage cooling EGR cooler proposed in the present invention mainly comprises: a housing 1, a partition plate 2, a first water path 3 and a second water path 4. Figure 1 , which shows the arrangement relationship of the shell 1, the partition plate 2, the first waterway 3 and the second waterway 4.

[0040] The dual-water-path two-stage cooling EGR cooler implementation scheme proposed in the present invention connects the air inlet flange 11 on one side of the dual-water-path two-stage cooling EGR cooler to the engine exhaust pipe, and connects the air outlet flange 12 on the other side to the engine injection pipe, so that the exhaust gas in the engine re-enters the engine combustion chamber after heat exchange and cooling through the heat exchange pipe 14, thereby improving the fuel utilization rate of the engine and reducing automobile exhaust emissions. It should also be noted that the L-shaped water inlet pipe 33 and the No. 1 water outlet pipe 35 in the No. 1 water path 3 of the dual-water-path two-stage cooling EGR cooler and the No. 2 water inlet pipe 42 and the No. 2 water outlet pipe 45 in the No. 2 water path 4 are connected to the two water paths of the engine, so that the exhaust gas in the heat exchange pipe 14 can pass through the LLC coolant of different temperatures input into the No. 1 water path 3 and the No. 2 water path 4, and the No. 1 cooling chamber 21 and the No. 2 cooling chamber 22 separated by the partition plate 2 are cooled twice in succession, so that the gas temperature entering the engine combustion chamber is lower than that of the one-stage cooling EGR cooler.

[0041] according to Figure 3 As shown, the heat dissipation effect of the dual-water-path two-stage cooling EGR cooler proposed in the present invention and the single-stage cooling EGR cooler with the same length and the same heat exchange area are compared. The heat exchange pipe 14 of the dual-water-path two-stage cooling EGR cooler and the traditional single-stage cooling EGR cooler are sequentially introduced with 700°C high-temperature exhaust gas at flow rates of 3.5kg / min, 4.0kg / min and 4.5kg / min respectively. The temperature of the LLC coolant introduced into the first water path 3 of the dual-water-path two-stage cooling EGR cooler proposed in the present invention is set to 80 ℃ flow control is 60L / min, the temperature of the LLC coolant introduced into the second water channel 4 is set to 40℃ and the flow control is 10L / min, the temperature of the LLC coolant introduced into the traditional EGR cooler is set to 80℃ and the flow control is 60L / min. After 3 tests, the dual-water-channel two-stage cooling EGR cooler proposed in the present invention is compared with the traditional single-stage cooling EGR cooler by an average difference of 20℃, which can be explained that the dual-water-channel two-stage cooling EGR cooler proposed in the present invention has higher heat dissipation efficiency than the traditional EGR cooler in a compact space.

[0042] The above-mentioned shell 1 is a hollow cavity composed of surrounding side walls. The left side of the shell 1 is an air inlet flange 11, which is connected to the engine exhaust pipe. The right side of the shell 1 is an air outlet flange 12, which is connected to the engine air injection pipe. Heat exchange tubes 14 are arranged at equal intervals in the cavity. The heat exchange tubes 14 are penetrated at the left and right ends of the shell 1. The air inlet on the left side of the heat exchange tube 14 is connected to the air inlet flange 11, and the air outlet on the right side of the heat exchange tube 14 is connected to the air outlet flange 12. A 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 chamber 21 and a second cooling chamber 22 respectively. The partition plate 2 is connected to the shell 1 by welding on all sides.

[0043] The above-mentioned No. 1 water circuit 3 is arranged on one side of the top of the shell 1 close to the air inlet flange 11, and the No. 1 water circuit 3 includes: a No. 1 water inlet groove 31, a water inlet cover 32, an L-shaped water inlet pipe 33, a No. 1 water outlet hole 34 and a No. 1 water outlet pipe 35, wherein the No. 1 water inlet groove 31 is opened on one side of the top of the shell 1 close to the air inlet flange 11, and the water inlet cover 32 is arranged on the outside of the No. 1 water inlet groove 31 at the top of the shell 1 by welding. The top of the water inlet cover 32 is conical, and the L-shaped water inlet pipe 33 is welded and penetrated on the inclined surface of one side of the top of the water inlet cover 32, so that the coolant entering the water inlet cover 32 through the L-shaped water inlet pipe 33 will form a vortex and enter the No. 1 cooling chamber 21 faster, and a No. 1 water outlet hole 34 is opened on one side of the top of the shell 1 close to the partition plate 2, the No. 1 water inlet groove 31 and the No. 1 water outlet hole 34 are communicated with the No. 1 cooling chamber 21 at the bottom, and the No. 1 water outlet pipe 35 is welded and penetrated in the No. 1 water outlet hole 34.

[0044] The No. 2 waterway 4 is arranged on one side of the top of the shell 1 near the outlet flange 12, and the No. 2 waterway 4 includes: a No. 2 water inlet hole 41, a No. 2 water inlet pipe 42, a No. 2 water outlet trough 43, a water outlet water collecting cover 44 and a No. 2 water outlet pipe 45, wherein the No. 2 water inlet hole 41 is opened at the top of the shell 1 on the side of the partition plate 2 away from the No. 1 water outlet hole 34, and the No. 2 water outlet trough 43 is opened at the top of the shell 1 away from the water inlet cover 32 and the No. 2 water inlet hole 41. The bottom of the No. 2 water inlet hole 41 and the No. 2 water outlet trough 43 are communicated with the No. 2 cooling chamber 22, and a No. 2 water outlet pipe 45 is penetrated in the No. 2 water inlet hole 41 by welding. A water outlet collecting cover 44 is welded at the top of the shell 1 and located outside the No. 2 water outlet trough 43. A No. 2 water outlet pipe 45 is penetrated on the top of the water outlet collecting cover 44. Compared with the water outlet hole with the same water outlet area, the No. 2 water outlet trough 43 has higher water outlet efficiency, which can reduce the pressure drop in the No. 2 waterway 4.

[0045] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A dual-water-circuit two-stage cooling EGR cooler, characterized in that: include: A shell (1), wherein the shell (1) is formed of a hollow cavity with surrounding side walls, the left side of the shell (1) is an air inlet flange (11), the air inlet flange (11) is communicated with an engine exhaust pipe, and the right side of the shell (1) is an air outlet flange (12), the air outlet flange (12) is connected to an engine air injection pipe; Heat exchange tubes (14), the heat exchange tubes (14) are arranged in equal intervals in the cavity, the heat exchange tubes (14) are passed through the left and right ends of the shell (1), the left air inlet of the heat exchange tube (14) is connected to the air inlet flange (11), and the right air outlet of the heat exchange tube (14) is connected to the air outlet flange (12); A partition plate (2), the partition plate (2) being arranged on one side of the cavity, the partition plate (2) dividing 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 to the outer shell (1) by welding on all sides; A first water channel (3), the first water channel (3) being arranged on one side of the top of the housing (1) close to the air inlet flange (11); The second water channel (4) is arranged on one side of the top of the outer shell (1) close to the air outlet flange (12).

2. The dual-water-path two-stage cooling EGR cooler according to claim 1 is characterized in that: The length of the first cooling chamber (21) is greater than the length of the second cooling chamber (22).

3. The dual-water-path two-stage cooling EGR cooler according to claim 2, characterized in that: A sealing fixing plate (13) is provided on one side of the air inlet flange (11) and the air outlet flange (12) close to the partition plate (2).

4. The dual-water-path two-stage cooling EGR cooler according to claim 3 is characterized in that: The first waterway (3) comprises: A first water inlet groove (31), the first water inlet groove (31) being disposed on a side of the top end of the housing (1) close to the air inlet flange (11); A water inlet cover (32), the water inlet cover (32) is arranged on the top of the housing (1) and located outside the first water inlet groove (31) by welding, and the top of the water inlet cover (32) is conical; An L-shaped water inlet pipe (33), wherein the L-shaped water inlet pipe (33) is welded and penetrated on a slope on one side of the top of the water inlet cover (32); A first water outlet hole (34), the first water outlet hole (34) being disposed on a side of the top of the housing (1) close to the partition plate (2); A first water outlet pipe (35), wherein the first water outlet pipe (35) is penetrated into the first water outlet hole (34) by welding.

5. The dual-water-path two-stage cooling EGR cooler according to claim 4 is characterized in that: The bottoms of the No. 1 water inlet groove (31) and the No. 1 water outlet hole (34) are in communication with the No. 1 cooling chamber (21).

6. The dual-water-path two-stage cooling EGR cooler according to claim 5, characterized in that: The second waterway (4) comprises: A second water inlet hole (41), the second water inlet hole (41) being provided at the top end of the housing (1) and located on a side of the partition plate (2) away from the first water outlet hole (34); A second water inlet pipe (42), wherein the second water outlet pipe (45) is welded and penetrated into the second water inlet hole (41); A second water outlet groove (43), the second water outlet groove (43) being arranged on a side of the top end of the housing (1) away from the water inlet cover (32) and the second water inlet hole (41); A water outlet collecting cover (44) is arranged on the top of the housing (1) and outside the second water outlet trough (43) by welding, and a second water outlet pipe (45) is passed through the top of the water outlet collecting cover (44).

7. The dual-water-path two-stage cooling EGR cooler according to claim 6, characterized in that: The bottom of the second water inlet hole (41) and the second water outlet groove (43) are in communication with the second cooling chamber (22).

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