Exhaust pipe, engine and vehicle
By setting crack-stopping holes on the turbocharger flange end face, the crack propagation path and control direction are changed, thus solving the problem of rapid crack propagation in the exhaust pipe turbocharger flange and improving the service life of the exhaust pipe and engine performance.
Patent Information
- Application Number
- CN202520142488.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-21
- Publication Date
- 2025-11-18
- Estimated Expiration
- 2035-01-21
AI Technical Summary
The low-cycle fatigue crack initiation in the exhaust pipe turbocharger flange results in a short crack initiation time and rapid propagation, leading to exhaust pipe leakage and affecting engine performance, making it difficult to meet user needs.
Crack arresting holes are installed on the end face of the turbocharger flange to change the location of the crack initiation, increase the crack propagation path, and control the crack propagation direction by reasonably arranging the crack arresting holes, thereby slowing down the crack speed and preventing it from propagating to the sealing zone.
It effectively controls crack propagation, improves the service life and performance of the exhaust pipe, prevents air leakage, and enhances the overall performance and reliability of the engine.
Smart Images
Figure CN223562903U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application relates to the engine technical field, in particular to an exhaust pipe, an engine and a vehicle. BACKGROUND
[0002] With the increasing performance requirements of engine products, the thermal load of the exhaust system continues to increase, and the turbocharger flange of the double-flow exhaust pipe has multiple low-cycle fatigue crack sources, which causes the crack initiation time of the turbocharger flange of the exhaust pipe to be shorter and shorter. With the long-time operation of the exhaust pipe, the turbocharger flange crack will expand to the sealing band, causing the exhaust pipe to leak, and the turbocharger flange will be cracked in a short time, causing the performance of the engine to decrease and being difficult to meet the user's demand. CONTENT OF THE UTILITY MODEL
[0003] The application discloses an exhaust pipe, an engine and a vehicle, which can control the direction and length of crack propagation of the turbocharger flange of the exhaust pipe, improve the damage tolerance characteristics, and prolong the service life of the exhaust pipe.
[0004] To achieve the above-mentioned purpose, the application provides the following technical solutions:
[0005] In a first aspect, the application provides an exhaust pipe, comprising an exhaust pipe body, a turbocharger flange and a crack arrest hole arranged on the end face of the turbocharger flange.
[0006] The turbocharger flange is connected to the exhaust pipe body and is used for mounting the turbocharger of the engine.
[0007] The turbocharger flange has a through hole, and the turbocharger flange is in communication with the exhaust pipe body through the through hole to form an exhaust passage; an intermediate partition plate extending to the end face of the turbocharger flange is arranged inside the exhaust passage, and the intermediate partition plate divides the exhaust passage into a first exhaust passage and a second exhaust passage.
[0008] Along the arrangement direction perpendicular to the first exhaust passage and the second exhaust passage, the intermediate partition plate and the turbocharger flange have a first connection position and a second connection position; the crack arrest hole is arranged at the first connection position; and / or, the crack arrest hole is arranged at the second connection position.
[0009] The exhaust pipe comprises an exhaust pipe body, a supercharger flange connected to the exhaust pipe body, the supercharger flange being used for mounting a supercharger of an engine, and a crack arrest hole provided on an end face of the supercharger flange and extending in a thickness direction of the supercharger flange. The supercharger flange has a through hole, and the supercharger flange is communicated with the exhaust pipe body through the through hole to form an exhaust passage. An intermediate partition plate extending to the end face of the supercharger flange is arranged in the exhaust passage, and the intermediate partition plate divides the exhaust passage into a first exhaust passage and a second exhaust passage. The intermediate partition plate and the supercharger flange have a first connecting position and a second connecting position in a direction perpendicular to the arrangement direction of the first exhaust passage and the second exhaust passage. The crack arrest hole is arranged at the first connecting position, or the crack arrest hole is arranged at the second connecting position, or the crack arrest hole is arranged at the first connecting position and the second connecting position. The exhaust pipe of the application can change the position of the crack source, increase the crack propagation path, and improve the crack propagation life to the sealing band by arranging the crack arrest hole near the crack source of the end face of the supercharger flange. Reasonable arrangement of the crack arrest hole can control the crack to initiate near the crack arrest hole and expand in the direction of the crack arrest hole, slow down the crack propagation speed, avoid the crack from expanding to the sealing band to cause the exhaust pipe to leak, and further avoid the crack from penetrating the supercharger flange in a short time, which is beneficial to improve the performance and service life of the engine exhaust pipe.
[0010] In some embodiments, when the first connecting position and the second connecting position are both provided with the crack arrest hole, the two crack arrest holes are symmetrically distributed.
[0011] In some embodiments, the depth of the crack arrest hole is less than or equal to the thickness of the supercharger flange.
[0012] In some embodiments, the cross-sectional shape of the crack arrest hole perpendicular to the thickness direction of the supercharger flange is a rounded triangle, and one of the rounded angles of the rounded triangle faces the intermediate partition plate.
[0013] In some embodiments, the rounded triangle comprises a first rounded angle, a second rounded angle and a third rounded angle, and the radius size of the first rounded angle, the second rounded angle and the third rounded angle is 3mm-6mm.
[0014] In some embodiments, the line between the first rounded angle and the second rounded angle is parallel to the arrangement direction of the first exhaust passage and the second exhaust passage.
[0015] The minimum wall thickness between the crack arrest hole and the first exhaust passage is 2.5mm-6mm, and the minimum wall thickness between the crack arrest hole and the second exhaust passage is 2.5mm-6mm.
[0016] In some embodiments, the minimum wall thickness between the crack arrest hole and the first exhaust passage and the minimum wall thickness between the crack arrest hole and the second exhaust passage are equal.
[0017] In a second aspect, the application provides an engine comprising a supercharger and an exhaust pipe as described in the first aspect, a sealing gasket is arranged between the supercharger and the supercharger flange, and a normal projection of a sealing area surrounded by the sealing gasket on the supercharger flange covers the crack stop hole.
[0018] In some embodiments, the engine further comprises an EGR flange, a plurality of plug-in flanges, an exhaust pipe flange, an EGR cooler, a cylinder head, and a plurality of exhaust pipe segments.
[0019] The EGR flange is fixedly connected with the exhaust pipe body and used for mounting the EGR cooler.
[0020] The plurality of plug-in flanges are fixedly connected with the exhaust pipe body and used for connecting the plurality of exhaust pipe segments.
[0021] The exhaust pipe flange is fixedly connected with the exhaust pipe body and used for connecting the cylinder head.
[0022] In a third aspect, the application provides a vehicle comprising the engine as described in the second aspect. BRIEF DESCRIPTION OF DRAWINGS
[0023] Figure 1 A structural schematic diagram of an engine and an exhaust pipe thereof provided by an embodiment of the application;
[0024] Figure 2 A side structural schematic diagram of an engine and an exhaust pipe thereof provided by an embodiment of the application;
[0025] Figure 3 A structural schematic diagram of a supercharger flange provided by an embodiment of the application;
[0026] Figure 4 A flowchart of damage tolerance optimization of an exhaust pipe provided by an embodiment of the application;
[0027] Figure legend: 1, exhaust pipe body; 2, supercharger flange; 3, crack stop hole; 31, first round corner; 32, second round corner; 33, third round corner; 4, through hole; 5, exhaust passage; 51, first exhaust passage; 52, second exhaust passage; 6, intermediate partition plate; 7, sealing gasket; 8, EGR flange; 9, plug-in flange; 10, exhaust pipe flange. DETAILED DESCRIPTION
[0028] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application. In the description of the embodiments of the present application, unless otherwise specified, " / " represents the meaning of or, for example, A / B can represent A or B; the "and / or" in the text only describes the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which means that there are three cases of A alone, A and B together, and B alone. In addition, in the description of the embodiments of the present application, "multiple" means two or more than two.
[0029] Hereinafter, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as implying or suggesting relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more of the features, and in the description of the embodiments of the present application, unless otherwise specified, the meaning of "multiple" is two or more than two.
[0030] In a first aspect, as Figures 1-3 The exhaust pipe provided by the embodiments of the present application includes an exhaust pipe body 1, a supercharger flange 2, and a crack stop hole 3 arranged on the end face of the supercharger flange 2.
[0031] The supercharger flange 2 is connected to the exhaust pipe body 1 and is used to install a supercharger of an engine.
[0032] The supercharger flange 2 has a through hole 4, and the supercharger flange 2 communicates with the exhaust pipe body 1 through the through hole 4 to form an exhaust passage 5; an intermediate partition plate 6 extending to the end face of the supercharger flange 2 is arranged inside the exhaust passage 5, and the intermediate partition plate 6 divides the exhaust passage 5 into a first exhaust passage 51 and a second exhaust passage 52.
[0033] Along the arrangement direction perpendicular to the first exhaust passage 51 and the second exhaust passage 52, the intermediate partition plate 6 and the supercharger flange 2 have a first connection position and a second connection position; the crack stop hole 3 is arranged at the first connection position; and / or, the crack stop hole 3 is arranged at the second connection position.
[0034] The aforementioned exhaust pipe includes an exhaust pipe body 1, to which a turbocharger flange 2 is connected. The turbocharger flange 2 is used to mount the engine's turbocharger. A crack-prevention hole 3 is provided on the end face of the turbocharger flange 2, extending in the thickness direction of the turbocharger flange 2. The turbocharger flange 2 has a through hole 4, through which it communicates with the exhaust pipe body 1 to form an exhaust passage 5. An intermediate partition 6 extending to the end face of the turbocharger flange 2 is provided inside the exhaust passage 5, dividing the exhaust passage 5 into a first exhaust passage 51 and a second exhaust passage 52. Along a direction perpendicular to the arrangement of the first exhaust passage 51 and the second exhaust passage 52, the intermediate partition 6 and the turbocharger flange 2 have a first connection position and a second connection position. The crack-prevention hole 3 is located at the first connection position; or, the crack-prevention hole 3 is located at the second connection position; or, the crack-prevention hole 3 is located at both the first and second connection positions. The exhaust pipe of this application, by setting crack arresting holes 3 near the crack initiation point on the end face of the turbocharger flange 2, can change the location of the crack initiation point, lengthen the crack propagation path, and improve the crack propagation life before the crack reaches the sealing zone. The proper placement of the crack arresting holes 3 can control crack initiation near the holes and propagation towards them, and can slow down the crack propagation rate, preventing the crack from extending to the sealing zone and causing exhaust pipe leakage. This, in turn, prevents the crack from penetrating the turbocharger flange in a short time, thus improving the performance and service life of the engine exhaust pipe.
[0035] It should be noted that the exhaust pipe body 1, turbocharger flange 2, and intermediate partition plate 6 in this embodiment can be integrally formed. The crack-arresting hole 3 can be cast near the low-cycle fatigue crack initiation point of the turbocharger flange 2. For example... Figure 3 As shown, when the turbocharger flange 2 does not have a crack arrestor hole 3, the crack propagation path is A; when the turbocharger flange 2 has a crack arrestor hole 3, the crack propagation path is B. In other words, the crack arrestor hole 3 can change the location of the crack initiation point, lengthen the crack propagation path, and slow down the crack propagation rate.
[0036] In some embodiments, when both the first connection position and the second connection position are provided with anti-crack holes 3, the two anti-crack holes 3 are symmetrically distributed.
[0037] One possible way to achieve this is, such as Figure 3 As shown, the turbocharger flange 2 of the exhaust pipe is provided with two crack-prevention holes 3. The two crack-prevention holes 3 are symmetrically distributed with the line connecting the center point E1 of the first exhaust passage 51 and the center point E2 of the second exhaust passage 52 as the axis of symmetry. Providing two crack-prevention holes 3 is beneficial for controlling different crack initiation areas of the turbocharger flange 2, thereby further improving the performance and service life of the engine exhaust pipe.
[0038] In some embodiments, the depth of the anti-cracking hole 3 is less than or equal to the thickness of the turbocharger flange 2. That is, the depth of the anti-cracking hole 3 can be less than or equal to the thickness of the turbocharger flange 2. When the depth of the anti-cracking hole 3 is less than the thickness of the turbocharger flange 2, the anti-cracking hole 3 is a blind hole.
[0039] One possible way to achieve this is, such as Figure 2 As shown, the depth of the crack arresting hole 3 is equal to the thickness of the turbocharger flange 2, which is beneficial for crack control in various crack initiation areas along the thickness direction of the turbocharger flange 2.
[0040] In some embodiments, the cross-sectional shape of the anti-crack hole 3 in the direction perpendicular to the thickness of the turbocharger flange 2 is a rounded triangle, and one of the rounded corners of the rounded triangle faces the middle partition.
[0041] One possible way to achieve this is, such as Figure 3 As shown, the thickness of the intermediate partition 6 gradually increases from the center towards both ends, with the greatest thickness at the connection point with the turbocharger flange 2. The cross-sectional shape of the crack-arresting hole 3 is a rounded triangle, with one of the rounded corners facing the intermediate partition 6. That is, the shape of the crack-arresting hole 3 is designed to conform to the intermediate partition 6 and the turbocharger flange 2, which is beneficial to improving the damage tolerance characteristics of the turbocharger flange 2, thereby improving the performance and service life of the exhaust pipe.
[0042] In some embodiments, the rounded triangle includes a first rounded corner 31, a second rounded corner 32, and a third rounded corner 33, wherein the radius r of the first rounded corner 31, the second rounded corner 32, and the third rounded corner 33 is 3mm-6mm. For example, the radius r of the first rounded corner 31 can be 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, etc.; the radius r of the second rounded corner 32 can be 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, etc.; and the radius r of the third rounded corner 33 can be 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, etc.; the specific dimensions are not limited.
[0043] One possible way to achieve this is, such as Figure 3 As shown, the first fillet 31, the second fillet 32, and the third fillet 33 have the same radius.
[0044] In some embodiments, the line connecting the first fillet 31 and the second fillet 32 is parallel to the arrangement direction of the first exhaust channel 51 and the second exhaust channel 52; the minimum wall thickness t between the crack-stopping hole 3 and the first exhaust channel 51 min The minimum wall thickness t between the crack-stopping hole 3 and the second vent 51 is 2.5mm-6mm. min The thickness is 2.5mm-6mm. For example, the minimum wall thickness t between the crack-stopping hole 3 and the first vent 51 is...min The minimum wall thickness t between the crack arrest hole 3 and the second exhaust passage 51 is 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, etc. min The minimum wall thickness t between the crack arrest hole 3 and the second exhaust passage 51 is 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, etc.
[0045] In some embodiments, as shown in FIG. 4, the minimum wall thickness between the crack arrest hole 3 and the first exhaust passage 51 is equal to the minimum wall thickness between the crack arrest hole 3 and the second exhaust passage 52. Figure 3 It can be understood that in other embodiments, the minimum wall thickness between the crack arrest hole 3 and the first exhaust passage 51 and the minimum wall thickness between the crack arrest hole 3 and the second exhaust passage 52 can also be unequal.
[0046] It should be noted that after the shape of the crack arrest hole 3 is determined, the position and size of the crack arrest hole 3 also need to be parameterized, that is, the parameters of the crack arrest hole 3 are adjusted through a damage tolerance optimization method to achieve an optimized arrangement of the crack arrest hole 3 to improve the damage tolerance performance of the exhaust pipe. As shown in FIG. 4, the specific steps include the following steps: Figure 4
[0047] S401, according to the engine model, a thermal-mechanical coupling low-cycle fatigue calculation simulation model of an exhaust pipe with a parameterized crack arrest hole is constructed;
[0048] S402, a thermal-mechanical coupling calculation of the exhaust pipe is performed to determine the position of the crack source of the supercharger flange;
[0049] S403, an initial crack structure containing the crack source position is established to build a damage optimization model of the exhaust pipe supercharger flange;
[0050] S404, a thermal-mechanical coupling crack propagation calculation is performed to obtain a crack propagation life curve;
[0051] S405, the parameterized size a1, a2, b, r of the crack arrest hole is adjusted;
[0052] S406, it is judged whether the crack propagation speed and direction meet the cold and hot impact test frequency requirement; if yes, S407 is executed; if no, S402 is executed;
[0053] S407, a1, a2, b, r are outputted.
[0054] In S405 and S407, a1 represents the perpendicular distance between the line connecting the first and second fillets 31 and 32 and the line connecting the center point E1 of the first exhaust passage 51 and the center point E2 of the second exhaust passage 52. a2 represents the height of the fillet triangle. b represents the length of the line connecting the first and second fillets 31 and 32. r represents the radius dimension of the first, second, and third fillets 31, 32, and 33.
[0055] The crack arrest hole of the embodiment of the application is arranged in the area of the low-cycle fatigue risk of the supercharger flange that does not meet the requirements. According to the low-cycle fatigue calculation result, the crack arrest hole can be arranged at the first connection position or the second connection position, or the crack arrest hole can be arranged at both the first connection position and the second connection position.
[0056] The crack arrest hole damage tolerance design is parameterized according to the exhaust pipe, the structure and position of the crack arrest hole are optimized in damage tolerance, the optimized arrangement of the crack arrest hole is realized, the crack is adjusted to expand only in the direction of the crack arrest hole, the crack expansion direction is controlled, and the life of the crack expansion to the sealing band is improved. In addition, the setting of the crack arrest hole can also realize the weight reduction of the whole machine, the assembly is simple, and the manufacturing process is simplified.
[0057] In a second aspect, as shown in Figure 1 The application provides an engine, which comprises a supercharger (not shown in the figure) and an exhaust pipe according to the first aspect. As shown in Figure 3 The sealing gasket 7 is arranged between the supercharger and the supercharger flange 2, and the normal projection of the sealing area surrounded by the sealing gasket 7 on the supercharger flange 2 covers the crack arrest hole 3. It should be noted that the high-face pressure area between the sealing gasket 7 and the supercharger flange 2 for sealing is the main sealing area (the sealing area surrounded by the sealing gasket 7) of the sealing gasket 7. The positions of the crack arrest hole 3 and the sealing gasket 7 are thus arranged, the life of the crack expansion to the sealing gasket 7 is improved, so that the crack expansion to the sealing gasket 7 is avoided to cause the exhaust pipe to leak, and then the crack is avoided to crack through the supercharger flange 2 in a short time, which is beneficial to improve the performance and service life of the engine exhaust pipe.
[0058] In some embodiments, the engine further comprises an EGR flange 8, a plurality of plug-in flanges 9, an exhaust pipe flange 10, an EGR cooler, a cylinder head, and a plurality of exhaust pipe segments;
[0059] The EGR flange 8 is fixedly connected with the exhaust pipe body 1 and is used for mounting the EGR cooler;
[0060] The plurality of plug-in flanges 9 are fixedly connected with the exhaust pipe body 1 and are used for connecting the plurality of exhaust pipe segments;
[0061] The exhaust pipe flange 10 is fixedly connected with the exhaust pipe body 1 and is used for connecting the cylinder head.
[0062] In a third aspect, the embodiments of the present application provide a vehicle comprising the engine of the second aspect. Since the vehicle comprises all the technical features of the engine, and the engine comprises all the technical features of the exhaust pipe, the vehicle also comprises all the beneficial effects of the exhaust pipe, which are not repeated here.
[0063] Obviously, various modifications and changes can be made to the present application by those skilled in the art without departing from the spirit and scope of the present application. Thus, it is intended that the present application cover the modifications and changes as they come within the scope of the claims, and their equivalents.
Claims
1. An exhaust pipe, characterized in that, It includes an exhaust pipe body, a turbocharger flange, and a crack-stop hole provided on the end face of the turbocharger flange; The turbocharger flange is connected to the exhaust pipe body and is used to install the engine's turbocharger; The turbocharger flange has a through hole, and the turbocharger flange communicates with the exhaust pipe body through the through hole to form an exhaust passage; the exhaust passage is provided with an intermediate partition plate extending to the end face of the turbocharger flange, and the intermediate partition plate divides the exhaust passage into a first exhaust passage and a second exhaust passage. Along a direction perpendicular to the arrangement of the first exhaust passage and the second exhaust passage, the intermediate partition plate and the turbocharger flange have a first connection position and a second connection position; the crack-stopping hole is provided at the first connection position; And / or, the anti-crack hole is located at the second connection position.
2. The exhaust pipe according to claim 1, characterized in that, When both the first connection position and the second connection position are provided with the crack-stopping hole, the two crack-stopping holes are symmetrically distributed.
3. The exhaust pipe according to claim 1, characterized in that, The depth of the crack-stopping hole is less than or equal to the thickness of the booster flange.
4. The exhaust pipe according to claim 1, characterized in that, The cross-sectional shape of the crack-stopping hole in the direction perpendicular to the thickness of the turbocharger flange is a rounded triangle, and one of the rounded corners of the rounded triangle faces the intermediate partition.
5. The exhaust pipe according to claim 4, characterized in that, The rounded triangle includes a first rounded corner, a second rounded corner, and a third rounded corner, and the radius of the first rounded corner, the second rounded corner, and the third rounded corner is 3mm-6mm.
6. The exhaust pipe according to claim 5, characterized in that, The line connecting the first fillet and the second fillet is parallel to the arrangement direction of the first exhaust passage and the second exhaust passage; The minimum wall thickness between the anti-crack hole and the first exhaust channel is 2.5mm-6mm, and the minimum wall thickness between the anti-crack hole and the second exhaust channel is 2.5mm-6mm.
7. The exhaust pipe according to claim 6, characterized in that, The minimum wall thickness between the anti-crack hole and the first exhaust channel is equal to the minimum wall thickness between the anti-crack hole and the second exhaust channel.
8. An engine, characterized in that, Includes a turbocharger and an exhaust pipe as described in any one of claims 1-7, wherein a sealing gasket is provided between the turbocharger and the turbocharger flange, and the sealing area enclosed by the sealing gasket covers the crack-resistant hole on the orthogonal projection of the turbocharger flange.
9. The engine according to claim 8, characterized in that, The engine also includes an EGR flange, multiple plug flanges, an exhaust pipe flange, an EGR cooler, a cylinder head, and multiple exhaust pipe sections; The EGR flange is fixedly connected to the exhaust pipe body and is used to install the EGR cooler; The plurality of plug-in flanges are fixedly connected to the exhaust pipe body and are used to connect the plurality of exhaust pipe sections; The exhaust pipe flange is fixedly connected to the exhaust pipe body and is used to connect the cylinder head.
10. A vehicle, characterized in that, Includes the engine as described in any one of claims 8-9.