Exhaust gas recirculation cooling device with flexible water pipe

Abstract

The utility model discloses an exhaust gas recirculation cooling device with a flexible water pipe. A liquid outlet pipe fitting comprises a first straight pipe part, a first corrugated pipe part, a second straight pipe part, a second corrugated pipe part, a third straight pipe part and a special-shaped flange part; the liquid outlet pipe fitting is connected with the heat exchange pipe shell through the first straight pipe part; the lower end of the first straight pipe part is connected with one end of the first corrugated pipe part, the other end of the first corrugated pipe part is connected with one end of the second straight pipe part, the other end of the second straight pipe part is connected with one end of the second corrugated pipe part, the other end of the second corrugated pipe part is connected with the upper end of the third straight pipe part, and the lower end of the third straight pipe part is connected with the special-shaped flange piece. The rigidity of the water pipe can be reduced, the flexibility of the water pipe is improved, the installation deviation of the water pipe and a matching part is reduced through the compensation amount of the corrugations, the installation reliability of the water pipe and the safety sealing performance of the water pipe are improved, and the installation limitation of a traditional EGR cooler water pipe is changed.

Description

Technical Field

[0001] The utility model relates to an exhaust gas recirculation cooling device with a flexible water pipe, belonging to the technical field of EGR coolers. Background Art

[0002] As a key component of the EGR system (exhaust gas circulation system), the EGR cooler is mainly used to effectively cool the high-temperature exhaust gas to the required temperature range. Normally, the coolant enters or flows out of the EGR cooler through the inlet and outlet pipes, and efficiently exchanges heat with the high-temperature exhaust gas inside the EGR cooler.

[0003] At present, the most common EGR cooler water inlet and outlet pipes on the market often have one end rigidly connected to the EGR cooler shell, and the other end is softly connected to the hose through a clamp. In some cases where the engine space size is limited, the water inlet or outlet pipe on the EGR cooler needs to be rigidly connected to the coolant input or output fittings. Rigid connection requires high positioning requirements, and the water pipe is generally made by expansion and compression molding. Its spatial size deviation is large, which often causes the installation hole of the fitting to be unable to align, and the installation success rate is low; at the same time, because both ends of the water pipe are rigidly connected, it will be subjected to greater vibration and impact during the operation of the engine, and there is a risk of leakage at both ends of the water pipe. Utility Model Content

[0004] To this end, the utility model provides an exhaust gas recirculation cooling device with a flexible water pipe to solve the problems that the traditional solution is not suitable for use in a space with limited dimensions, has a low installation success rate due to large space dimension deviations, and is prone to leakage.

[0005] In order to achieve the above-mentioned purpose, the utility model provides the following technical solutions: an exhaust gas recirculation cooling device with a flexible water pipe, comprising a heat exchange tube shell, wherein a heat exchange tube core is arranged inside the heat exchange tube shell; an air inlet pipe is arranged at one end of the heat exchange tube shell, wherein the air inlet pipe is connected to one end of the heat exchange tube core, and an air outlet pipe is arranged at the other end of the heat exchange tube shell, wherein the air outlet pipe is connected to the other end of the heat exchange tube core; a liquid inlet pipe is also connected to the upper side of the heat exchange tube shell; a liquid outlet pipe is also connected to the lower side of the heat exchange tube shell; the liquid outlet pipe comprises a first straight tube portion, a first corrugated tube portion, a second straight tube portion, a second corrugated tube portion, a third straight tube portion and a special-shaped flange;

[0006] The liquid outlet pipe fitting is connected to the heat exchange tube shell through the first straight pipe portion; the lower end of the first straight pipe portion is connected to one end of the first corrugated pipe portion, the other end of the first corrugated pipe portion is connected to one end of the second straight pipe portion, the other end of the second straight pipe portion is connected to one end of the second corrugated pipe portion, the other end of the second corrugated pipe portion is connected to the upper end of the third straight pipe portion, and the lower end of the third straight pipe portion is connected to the special-shaped flange.

[0007] As a preferred embodiment of an exhaust gas recirculation cooling device with a flexible water pipe, the air inlet pipe is formed with an exhaust gas inlet, and a first group of mounting holes are provided at the edge of the exhaust gas inlet; the air outlet pipe is formed with an exhaust gas outlet, and a second group of mounting holes are provided at the edge of the exhaust gas outlet.

[0008] As a preferred solution of the exhaust gas recirculation cooling device with a flexible water pipe, the second straight pipe portion is positionally adjusted relative to the first straight pipe portion by the first corrugated pipe portion;

[0009] The position of the third straight pipe portion is adjusted relative to the second straight pipe portion by the second bellows portion.

[0010] As a preferred solution for an exhaust gas recirculation cooling device with a flexible water pipe, the special-shaped flange component includes a special-shaped flange body, a special-shaped flange first interface is formed at the upper end of the special-shaped flange body, the lower end of the third straight pipe portion is inserted into the interior of the special-shaped flange first interface, and the edge of the third straight pipe portion and the contact position of the special-shaped flange first interface are welded.

[0011] As a preferred solution of the exhaust gas recirculation cooling device with a flexible water pipe, a reduced diameter portion is formed inside the special-shaped flange body, and the first interface of the special-shaped flange is connected to the second interface of the special-shaped flange via the reduced diameter portion.

[0012] As a preferred solution of the exhaust gas recirculation cooling device with a flexible water pipe, a sealing groove is formed on the outer side of the second interface of the special-shaped flange, and the interior of the sealing groove is filled with an O-ring.

[0013] As a preferred solution of the exhaust gas recirculation cooling device with a flexible water pipe, one side of the special-shaped flange body extends outward to form a fixing portion, and the fixing portion is provided with a fixing long hole.

[0014] As a preferred solution of the exhaust gas recirculation cooling device with a flexible water pipe, the upper end of the heat exchange tube shell is connected to a first fixing seat, and the lower end of the heat exchange tube shell is connected to a second fixing seat.

[0015] The utility model has the following advantages: the liquid outlet pipe comprises a first straight pipe part, a first corrugated pipe part, a second straight pipe part, a second corrugated pipe part, a third straight pipe part and a special-shaped flange part; the liquid outlet pipe is connected to the heat exchange tube shell through the first straight pipe part; the lower end of the first straight pipe part is connected to one end of the first corrugated pipe part, the other end of the first corrugated pipe part is connected to one end of the second straight pipe part, the other end of the second straight pipe part is connected to one end of the second corrugated pipe part, the other end of the second corrugated pipe part is connected to the upper end of the third straight pipe part, and the lower end of the third straight pipe part is connected to the special-shaped flange part. The utility model can reduce the rigidity of the water pipe itself, increase the flexibility of the water pipe, reduce the installation deviation between the water pipe and the fitting by compensating the amount of corrugation, improve the installation reliability of the water pipe and the safety sealing performance of the water pipe, and change the limitations of the traditional EGR cooler water pipe installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the implementation or the prior art description. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0017] The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with the technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantial technical significance. Any structural modification, change in proportion or adjustment in size shall still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of an exhaust gas recirculation cooling device with a flexible water pipe provided in an embodiment of the utility model;

[0019] Figure 2 It is a schematic diagram of the assembly of the third straight pipe portion and the special-shaped flange of the exhaust gas recirculation cooling device with a flexible water pipe provided in an embodiment of the utility model;

[0020] Figure 3 A three-dimensional schematic diagram of a special-shaped flange of an exhaust gas recirculation cooling device with a flexible water pipe provided in an embodiment of the utility model;

[0021] Figure 4 It is a schematic diagram of a deformed design of an exhaust gas recirculation cooling device with a flexible water pipe provided in an embodiment of the utility model.

[0022] In the figure, 1, heat exchange tube shell; 2, air inlet pipe fitting; 3, air outlet pipe fitting; 4, liquid inlet pipe fitting; 5, liquid outlet pipe fitting; 6, first straight pipe portion; 7, first corrugated pipe portion; 8, second straight pipe portion; 9, second corrugated pipe portion; 10, third straight pipe portion; 11, special-shaped flange; 12, exhaust gas inlet; 13, first group of mounting holes; 14, exhaust gas outlet; 15, second group of mounting holes; 16, special-shaped flange body; 17, first interface of special-shaped flange; 18, reduced diameter portion; 19, second interface of special-shaped flange; 20, sealing groove; 21, O-ring; 22, long fixing hole; 23, first fixing seat; 24, second fixing seat; 25, fixing portion. DETAILED DESCRIPTION

[0023] The following is a specific embodiment of the present invention. People familiar with the technology can easily understand the other advantages and functions of the present invention from the contents disclosed in this specification. Obviously, the described embodiment is a part of the present invention, not all of the embodiments. Based on the 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.

[0024] See also Figure 1 , Figure 2 and Figure 3 The embodiment of the utility model provides an exhaust gas recirculation cooling device with a flexible water pipe, comprising a heat exchange tube shell 1, wherein a heat exchange tube core is arranged inside the heat exchange tube shell 1; an air inlet pipe 2 is arranged at one end of the heat exchange tube shell 1, and the air inlet pipe 2 is connected to one end of the heat exchange tube core, and an air outlet pipe 3 is arranged at the other end of the heat exchange tube shell 1, and the air outlet pipe 3 is connected to the other end of the heat exchange tube core; a liquid inlet pipe 4 is also connected to the upper side of the heat exchange tube shell 1; a liquid outlet pipe 5 is also connected to the lower side of the heat exchange tube shell 1; the liquid outlet pipe 5 comprises a first straight tube portion 6, a first corrugated tube portion 7, a second straight tube portion 8, a second corrugated tube portion 9, a third straight tube portion 10 and a special-shaped flange 11;

[0025] Among them, the liquid outlet pipe fitting 5 is connected to the heat exchange tube shell 1 through the first straight pipe portion 6; the lower end of the first straight pipe portion 6 is connected to one end of the first corrugated pipe portion 7, the other end of the first corrugated pipe portion 7 is connected to one end of the second straight pipe portion 8, the other end of the second straight pipe portion 8 is connected to one end of the second corrugated pipe portion 9, the other end of the second corrugated pipe portion 9 is connected to the upper end of the third straight pipe portion 10, and the lower end of the third straight pipe portion 10 is connected to the special-shaped flange 11.

[0026] In this embodiment, the air inlet pipe 2 forms an exhaust gas inlet 12, and the edge of the exhaust gas inlet 12 is provided with a first group of mounting holes 13; the air outlet pipe 3 forms an exhaust gas outlet 14, and the edge of the exhaust gas outlet 14 is provided with a second group of mounting holes 15.

[0027] Specifically, the high-temperature exhaust gas is transported to the heat exchange tube core inside the heat exchange tube shell 1 through the exhaust gas inlet 12, and the high-temperature exhaust gas is discharged from the exhaust gas outlet 14 for reuse after heat exchange with the coolant inside the heat exchange tube core. Among them, the air inlet pipe 2 is connected to the engine exhaust outlet through the first group of mounting holes 13, and the air outlet pipe 3 is connected to the exhaust gas outlet pipe through the second group of mounting holes 15.

[0028] In this embodiment, the second straight tube portion 8 is position-adjusted relative to the first straight tube portion 6 by the first corrugated tube portion 7 ; the third straight tube portion 10 is position-adjusted relative to the second straight tube portion 8 by the second corrugated tube portion 9 .

[0029] Specifically, in order to reduce the risk of leakage at the brazed connection, a certain number of corrugations are provided at the bend near the initial end of the liquid outlet pipe 5 to form a first corrugated pipe portion 7. The corrugations of the first corrugated pipe portion 7 can reduce the vibration impact of the water pipe during the operation of the engine.

[0030] Among them, a certain number of corrugations are arranged at the bend of the end of the liquid outlet pipe 5 to form a second corrugated pipe part 9. The corrugations of the second corrugated pipe part 9 can absorb and compensate for the spatial size deviation of part of the liquid outlet pipe 5, thereby improving the installation feasibility of the water pipe.

[0031] In this embodiment, the special-shaped flange part 11 includes a special-shaped flange body 16, the upper end of the special-shaped flange body 16 is formed with a special-shaped flange first interface 17, the lower end of the third straight pipe portion 10 is inserted into the interior of the special-shaped flange first interface 17, and the edge of the third straight pipe portion 10 and the contact position of the special-shaped flange first interface 17 are welded; a reduced diameter portion 18 is formed inside the special-shaped flange body 16, and the special-shaped flange first interface 17 is connected to the special-shaped flange second interface 19 via the reduced diameter portion 18; a sealing groove 20 is formed on the outer side of the special-shaped flange second interface 19, and the interior of the sealing groove 20 is filled with an O-ring 21; one side of the special-shaped flange body 16 extends outward to form a fixing portion 25, and the fixing portion 25 is provided with a fixing long hole 22.

[0032] Specifically, the special-shaped flange body 16 is butted with the third straight pipe portion 10 of the liquid outlet pipe 5 through the special-shaped flange first interface 17, and after butting, the edge of the third straight pipe portion 10 and the contact position of the special-shaped flange first interface 17 are welded and fixed. Among them, the design of the reduced diameter portion 18 makes the inner diameter of the special-shaped flange second interface 19 smaller than the inner diameter of the special-shaped flange first interface 17, which plays a role in accelerating the coolant.

[0033] The fixed long hole 22 can further adjust the installation hole position deviation. The special-shaped flange second interface 19 is provided with a sealing groove 20, and an O-ring 21 is installed on the sealing groove 20, which can effectively ensure the sealing performance of the special-shaped flange part 11 and the coolant matching part hole.

[0034] In this embodiment, the upper end of the heat exchange tube shell 1 is connected to a first fixing seat 23, and the lower end of the heat exchange tube shell 1 is connected to a second fixing seat 24. The exhaust gas recirculation cooling device with a flexible water pipe is installed and fixed by the first fixing seat 23 and the second fixing seat 24.

[0035] See also Figure 4 In a possible embodiment, one end of the liquid outlet pipe 5 is welded to the heat exchange tube shell 1, and the other end of the liquid outlet pipe 5 is welded to the flat flange. According to the compensation amount requirement, a certain number of corrugations are set on the straight section of the water pipe of the liquid outlet pipe 5. The end of the liquid outlet pipe 5 is brazed and connected to the two-hole flat flange; a metal gasket is set between the flat flange and the plane of the engine cylinder hole, and the two planes are sealed through the annular groove on the gasket. It can also solve the technical problem of the present application to a certain extent.

[0036] In summary, the utility model includes a heat exchange tube shell 1, wherein a heat exchange tube core is arranged inside the heat exchange tube shell 1; an air inlet pipe 2 is arranged at one end of the heat exchange tube shell 1, and the air inlet pipe 2 is connected to one end of the heat exchange tube core; an air outlet pipe 3 is arranged at the other end of the heat exchange tube shell 1, and the air outlet pipe 3 is connected to the other end of the heat exchange tube core; a liquid inlet pipe 4 is also connected to the upper side of the heat exchange tube shell 1; a liquid outlet pipe 5 is also connected to the lower side of the heat exchange tube shell 1, and the liquid outlet pipe 5 includes a first straight tube portion 6, a first corrugated tube portion 7, and a second straight tube portion 8. The pipe part 8, the second corrugated pipe part 9, the third straight pipe part 10 and the special-shaped flange 11; the liquid outlet pipe part 5 is connected to the heat exchange tube shell 1 through the first straight pipe part 6; the lower end of the first straight pipe part 6 is connected to one end of the first corrugated pipe, the other end of the first corrugated pipe is connected to one end of the second straight pipe part 8, the other end of the second straight pipe part 8 is connected to one end of the second corrugated pipe part 9, the other end of the second corrugated pipe part 9 is connected to the upper end of the third straight pipe part 10, and the lower end of the third straight pipe part 10 is connected to the special-shaped flange 11. The high-temperature exhaust gas is transported to the heat exchange tube core inside the heat exchange tube shell 1 through the exhaust gas inlet 12, and the high-temperature exhaust gas is discharged from the exhaust gas outlet 14 for reuse after heat exchange with the coolant inside the heat exchange tube core. Among them, the air inlet pipe part 2 is connected to the engine exhaust outlet through the first group of mounting holes 13, and the air outlet pipe part 3 is connected to the exhaust gas outlet pipe through the second group of mounting holes 15. A certain number of corrugations are set at the end bend of the liquid outlet pipe part 5 to form the second corrugated pipe part 9. The corrugation of the second corrugated pipe part 9 can absorb and compensate for the spatial size deviation of part of the liquid outlet pipe 5, thereby improving the installation feasibility of the water pipe. The special-shaped flange body 16 is butted with the third straight pipe part 10 of the liquid outlet pipe 5 through the first interface 17 of the special-shaped flange, and is welded and fixed at the contact position between the edge of the third straight pipe part 10 and the first interface 17 of the special-shaped flange after butt connection. Among them, the design of the reduced diameter part 18 makes the inner diameter of the second interface 19 of the special-shaped flange smaller than the inner diameter of the first interface 17 of the special-shaped flange, which plays a role in accelerating the coolant. The fixed long hole 22 can further adjust the installation hole position deviation. A sealing groove 20 is provided on the second interface 19 of the special-shaped flange, and an O-ring 21 is installed on the sealing groove 20, which can effectively ensure the sealing performance of the special-shaped flange part 11 and the coolant matching part hole position. The utility model can reduce the rigidity of the water pipe itself, increase the flexibility of the water pipe, reduce the installation deviation of the water pipe and the matching part through the compensation amount of the corrugation, improve the installation reliability of the water pipe and the safety sealing performance of the water pipe, and change the limitations of the traditional EGR cooler water pipe installation.

[0037] The above is a relatively specific and detailed description of the utility model through general description and specific embodiments. It should be understood that based on the technical concept of the utility model, some conventional adjustments or further innovations can be made to these specific embodiments; however, as long as they do not deviate from the technical concept of the utility model, the technical solutions obtained by these conventional adjustments or further innovations also fall within the scope of protection of the claims of the utility model.

Claims

1. An exhaust gas recirculation cooling device with a flexible water pipe, comprising a heat exchange tube shell (1), wherein a heat exchange tube core is arranged inside the heat exchange tube shell (1); an air inlet pipe (2) is arranged at one end of the heat exchange tube shell (1), wherein the air inlet pipe (2) is connected to one end of the heat exchange tube core, and an air outlet pipe (3) is arranged at the other end of the heat exchange tube shell (1), wherein the air outlet pipe (3) is connected to the other end of the heat exchange tube core; a liquid inlet pipe (4) is also connected to the upper side of the heat exchange tube shell (1); and a liquid outlet pipe (5) is also connected to the lower side of the heat exchange tube shell (1); characterized in that: The liquid outlet pipe member (5) comprises a first straight pipe portion (6), a first corrugated pipe portion (7), a second straight pipe portion (8), a second corrugated pipe portion (9), a third straight pipe portion (10) and a special-shaped flange member (11); The liquid outlet pipe (5) is connected to the heat exchange tube shell (1) via the first straight tube portion (6); the lower end of the first straight tube portion (6) is connected to one end of the first corrugated tube portion (7), the other end of the first corrugated tube portion (7) is connected to one end of the second straight tube portion (8), the other end of the second straight tube portion (8) is connected to one end of the second corrugated tube portion (9), the other end of the second corrugated tube portion (9) is connected to the upper end of the third straight tube portion (10), and the lower end of the third straight tube portion (10) is connected to the special-shaped flange (11).

2. The exhaust gas recirculation cooling device with a flexible water pipe according to claim 1, characterized in that: The air inlet pipe (2) is formed with an exhaust gas inlet (12), and the edge of the exhaust gas inlet (12) is provided with a first group of mounting holes (13); the air outlet pipe (3) is formed with an exhaust gas outlet (14), and the edge of the exhaust gas outlet (14) is provided with a second group of mounting holes (15).

3. The exhaust gas recirculation cooling device with a flexible water pipe according to claim 1, characterized in that: The second straight tube portion (8) is positionally adjusted relative to the first straight tube portion (6) via the first corrugated tube portion (7); The position of the third straight pipe portion (10) is adjusted relative to the second straight pipe portion (8) by the second corrugated pipe portion (9).

4. The exhaust gas recirculation cooling device with a flexible water pipe according to claim 1, characterized in that: The special-shaped flange part (11) comprises a special-shaped flange body (16), the upper end of the special-shaped flange body (16) is formed with a special-shaped flange first interface (17), the lower end of the third straight pipe part (10) is inserted into the interior of the special-shaped flange first interface (17), and the edge of the third straight pipe part (10) and the contact position of the special-shaped flange first interface (17) are welded.

5. The exhaust gas recirculation cooling device with a flexible water pipe according to claim 4, characterized in that: A reduced diameter portion (18) is formed inside the special-shaped flange body (16), and the special-shaped flange first interface (17) is connected to the special-shaped flange second interface (19) via the reduced diameter portion (18).

6. An exhaust gas recirculation cooling device with a flexible water pipe according to claim 5, characterized in that: A sealing groove (20) is formed on the outer side of the second interface (19) of the special-shaped flange, and an O-ring (21) is filled inside the sealing groove (20).

7. The exhaust gas recirculation cooling device with a flexible water pipe according to claim 5, characterized in that: A fixing portion (25) is formed by extending outwards on one side of the special-shaped flange body (16), and the fixing portion (25) is provided with a fixing long hole (22).

8. The exhaust gas recirculation cooling device with a flexible water pipe according to claim 1, characterized in that: The upper end of the heat exchange tube shell (1) is connected to a first fixing seat (23), and the lower end of the heat exchange tube shell (1) is connected to a second fixing seat (24).

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