A method of centering and sealing a diesel exhaust system connection

Abstract

This invention discloses a method for centering and sealing connecting pipes in a diesel engine exhaust system, belonging to the technical field of diesel engine exhaust systems. The method includes the following steps: Step S1: Centering and installing the pulse converter onto the flywheel housing; Step S2: Installing positioning sleeves and measuring gauges on the left and right sides of the connecting pipe, replacing the standard thickness conical sealing rings. Both the positioning sleeves and measuring gauges are disc structures with a connecting end on one side; Step S3: Determining and selecting the required thickness of the conical sealing rings at each connection point in the connecting pipe; Step S4: Removing the positioning sleeves and measuring gauges, and installing the conical sealing rings of the selected thickness in Step S3 at the corresponding positions. This invention enables quick and easy selection of suitable conical sealing rings during installation based on the gap distance and centering between the exhaust bend, exhaust manifold, and pulse converter, ensuring the sealing and centering of each connection point in the connecting pipe.

Description

Technical Field

[0001] This invention belongs to the technical field of diesel engine exhaust systems, and specifically relates to a method for centering and sealing the connecting pipes of a diesel engine exhaust system. Background Technology

[0002] like Figure 1 As shown, the connecting pipeline of the diesel engine exhaust system includes a pulse converter 4 installed on the threaded hole of the flywheel housing and two exhaust manifolds 1 connected to the left and right sides of the pulse converter 4 via two exhaust bends 3 respectively. The connections between the exhaust bends 3 and the pulse converter 4, as well as the exhaust manifolds 1, are sealed by tapered sealing rings 2 and secured by clamping flanges 7. Figure 2 As shown, the conical sealing ring 2 includes an integrally formed conical end and a flat end. During sealing, the conical end of the conical sealing ring 2 is inserted into the port of the exhaust bend 3 for sealing, while the exhaust main pipe 1 and the pulse converter 4 are sealed through the flat end of the conical sealing ring 2. Due to machining and assembly errors, the conical sealing ring 2 has different specifications. Therefore, when faced with the selection of the specifications of the conical sealing ring 2, operators need to spend a lot of time selecting the appropriate conical sealing ring 2 for the connection of various components of the connecting pipeline, which is time-consuming, labor-intensive, and delays the installation progress. Therefore, under normal circumstances, operators generally do not select the specifications of the conical sealing ring 2 during the assembly of connecting pipes, and only use the conical sealing ring 2 with the intermediate standard thickness for installation. However, this method does not allow for any gaps visible to the naked eye during installation, and operators need to judge the fit of the sealing surface with the naked eye. Therefore, it is subjective and inconsistent, and it is easy for the conical sealing ring 2 to be misaligned or poorly fitted after tightening. During use, it is very easy to cause smoke leakage. Furthermore, this method requires high machining precision for the three components: exhaust main pipe 1, exhaust bend pipe 3, and pulse converter 4, and has poor applicability and flexibility, which undoubtedly increases the assembly difficulty.

[0003] Therefore, there is a need for a convenient and quick method to achieve centering and sealing of diesel engine exhaust system connecting pipes at all joints. Summary of the Invention

[0004] The purpose of this invention is to provide a centering and sealing method for connecting pipes of a diesel engine exhaust system. This method enables the quick selection of a suitable conical sealing ring based on the gap and centering between the exhaust bend, the exhaust manifold, and the pulse converter during installation. This ensures the sealing and centering of all connections in the connecting pipes. The method is convenient and quick to operate, effectively saving installation time between the various components of the connecting pipes and improving operational efficiency. At the same time, it effectively reduces the assembly difficulty of the exhaust manifold, exhaust bend, and pulse converter.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A method for centering and sealing a connecting pipe in a diesel engine exhaust system includes the following steps:

[0007] Step S1: Align and install the pulse converter onto the flywheel housing;

[0008] Step S2: Install positioning sleeves and measuring gauges on the left and right sides of the connecting pipe respectively to replace the standard thickness conical sealing ring. Both positioning sleeves and measuring gauges are disc structures with a connecting end on one side. During installation, first install the disc of the positioning sleeve onto the connection port of the pulse converter, and at the same time insert the connecting end of the measuring gauge into one end of the exhaust main pipe. Then, insert one end of the exhaust bend into the connecting end of the positioning sleeve. Finally, press along the bend direction of the exhaust bend so that the other end of the bend abuts against the disc of the measuring gauge.

[0009] Step S3: Determine and select the required thickness of the conical sealing ring at each connection point in the connecting pipeline: By judging the offset and tilting of the exhaust bend pipe opening on the measuring gauge disc, select the required thickness of the conical sealing ring between the exhaust bend pipe on the left and right sides of the connecting pipeline and the pulse converter and exhaust main pipe. The thickness of the conical sealing ring includes not only the standard thickness but also low thickness and high thickness.

[0010] Step S4: Install the conical sealing ring: Disassemble the positioning sleeve and measuring gauge between the left and right exhaust bends and the pulse converter and the exhaust main pipe respectively, and install the conical sealing ring of the thickness specification selected in step S3 at the corresponding position to complete the centering and sealing.

[0011] A further improvement of the technical solution of the present invention is that: in step S2, the thickness of the disk of the positioning sleeve and the measuring gauge is the same as the thickness of the flat end of the tapered sealing ring of standard thickness.

[0012] A further improvement of the technical solution of the present invention is that: the disc of the measuring gauge is a scale disc, and several reference lines are concentrically arranged on its disc surface, and the several reference lines are respectively adapted to exhaust bends of different diameters.

[0013] A further improvement of the technical solution of the present invention is that: in step S3, when determining the thickness specification of the required conical sealing ring between the left and right exhaust bends and the pulse converter, the offset of the pipe openings of the left and right exhaust bends relative to their corresponding baselines on the dial is observed.

[0014] A further improvement of the technical solution of the present invention is as follows: based on the baseline on the dial, when the pipe opening of the left exhaust bend is offset to the left or the pipe opening of the right exhaust bend is offset to the right, a low-thickness conical sealing ring is selected; when the pipe opening of the left exhaust bend is offset to the right or the pipe opening of the right exhaust bend is offset to the left, a high-thickness conical sealing ring is selected; when neither the left nor the right exhaust bend is offset, a standard-thickness conical sealing ring is selected.

[0015] A further improvement of the technical solution of the present invention is that: in step S3, when determining the thickness specification of the required conical sealing ring between the left and right exhaust bends and the exhaust main pipe, the lifting status of the pipe openings of the left and right exhaust bends on the dial surface is observed respectively.

[0016] A further improvement of the technical solution of the present invention is as follows: based on the dial surface, when the left side of the exhaust pipe opening is raised or the right side of the exhaust pipe opening is raised, a low-thickness conical sealing ring is selected; when the right side of the exhaust pipe opening is raised or the left side of the exhaust pipe opening is raised, a high-thickness conical sealing ring is selected; when neither the left nor the right exhaust pipes are raised, a standard-thickness conical sealing ring is selected.

[0017] The technological advancements achieved by this invention due to the adoption of the above technical solutions are as follows:

[0018] The present invention provides a centering and sealing method for diesel engine exhaust system connecting pipes. This method allows for quick selection of a suitable conical sealing ring based on the gap and centering between the exhaust bend, exhaust manifold, and pulse converter during installation. This ensures the sealing and centering of all connections in the connecting pipes. The method is convenient and quick to operate, effectively saving installation time between the various components of the connecting pipes and improving operational efficiency. It also effectively reduces the assembly difficulty of the exhaust manifold, exhaust bend, and pulse converter. Attached Figure Description

[0019] Figure 1 This is a top view assembly diagram of the exhaust system connection pipeline in the background art of this invention;

[0020] Figure 2 This is an assembly diagram of the conical sealing ring and the exhaust bend in the background art of this invention;

[0021] Figure 3 This is a top view assembly diagram of the measuring gauge and positioning sleeve during the centering and sealing operation of the present invention;

[0022] Figure 4 This is a schematic diagram of the measuring gauge in this invention;

[0023] Figure 5 This is a side view assembly diagram of the left exhaust bend, measuring gauge, and positioning sleeve in this invention;

[0024] Figure 6 This is a magnified view of point A when the offset of the left exhaust pipe is determined by measuring gauge in this invention.

[0025] Figure 7 This is a magnified view of point A when the left exhaust pipe bend is tilted up by measuring gauge in this invention;

[0026] Among them, 1. exhaust manifold, 2. conical sealing ring, 3. exhaust bend, 4. pulse converter, 5. positioning sleeve, 6. measuring gauge, 6-1. dial, 6-2. baseline, 7. clamping flange. Detailed Implementation

[0027] The present invention will be further described in detail below with reference to embodiments:

[0028] like Figures 3-7 As shown, the present invention provides a method for centering and sealing a connecting pipe in a diesel engine exhaust system, specifically including the following steps:

[0029] Step S1: Install the pulse converter 4 onto the flywheel housing;

[0030] Specifically, the pulse converter 4 and the flywheel housing are respectively provided with four symmetrical threaded holes. First, the two plug-in positioning devices are inserted into the two sets of threaded holes on the upper part of the pulse converter 4 and the flywheel housing in sequence, so as to center and position the pulse converter 4 on the flywheel housing. Then, two fastening bolts are installed into the two sets of threaded holes on the lower part of the pulse converter 4 and the flywheel housing and tightened to a torque of 35 Nm. Finally, the two plug-in positioning devices are removed, and the other two fastening bolts are installed into the two sets of threaded holes on the upper part of the pulse converter 4 and the flywheel housing and tightened to a torque of 35 Nm. Preferably, the plug-in positioning device adopts a pin or other pin structure with positioning function.

[0031] Step S2: Install positioning sleeves 5 and measuring gauges 6 on the left and right sides of the connecting pipeline respectively, so that they replace the standard thickness conical sealing rings 2;

[0032] Specifically, such as Figure 3 As shown, both the positioning sleeve 5 and the measuring gauge 6 are custom-made parts. Both are disc structures with a connecting end on one side. The thickness of the discs of both the positioning sleeve 5 and the measuring gauge 6 is the same as the thickness of the flat end of the standard thickness conical sealing ring 2. Specifically, the connecting end of the positioning sleeve 5 is adapted to the inner wall of the exhaust bend 3, and the disc of the positioning sleeve 5 is adapted to the connecting port on the pulse converter 4. The connecting end of the measuring gauge 6 is adapted to the inner wall of the exhaust main pipe 1, and the disc of the measuring gauge 6 is adapted to the opening of the exhaust bend 3. Figure 4As shown, the disc of the measuring gauge 6 is a scale 6-1, and several reference lines 6-2 are concentrically set on its surface. That is, the several reference lines 6-2 are multiple concentric circles, which can be adapted to exhaust bends 3 of different diameters. When the pipe opening of the exhaust bend 3 is aligned and abuts against the scale 6-1, the corresponding reference line 6-2 is exactly located on the outer circumference of its pipe opening. Therefore, the measuring gauge 6 can be applied to exhaust bends 3 of various diameters and has higher applicability and versatility.

[0033] To better identify each baseline 6-2, the same or different pigments can be applied to each baseline 6-2 for distinction. Preferably, the innermost baseline 6-2 is painted blue, and the other baselines 6-2 are painted yellow. The exhaust bend 3 that the innermost baseline 6-2 is usually used in daily applications.

[0034] The method for installing positioning sleeves 5 and measuring gauges 6 on the left and right sides of the connecting pipeline is as follows:

[0035] like Figure 3 and Figure 5 As shown, first install the disc of the positioning sleeve 5 onto the connection port of the pulse converter 4, and at the same time insert the connection end of the measuring gauge 6 into one end of the exhaust manifold 1. Then, insert one end of the exhaust bend 3 onto the connection end of the positioning sleeve 5. Finally, press along the bend direction of the exhaust bend 3 so that its other end abuts against the disc of the measuring gauge 6, that is, against the scale 6-1 of the measuring gauge 6.

[0036] According to the above method, the two exhaust bends 3 are installed on the connection ports on the left and right sides of the pulse converter 4 through the positioning sleeve 5 and the measuring gauge 6 respectively, and connected to the exhaust main pipes 1 on the left and right sides respectively, so that the positioning sleeve 5 and the measuring gauge 6 replace the standard thickness conical sealing ring 2 at the corresponding position.

[0037] Step S3: Determine and select the required thickness specification of the conical sealing ring 2 at each connection point in the connecting pipeline;

[0038] Specifically, by judging the offset and tilting of the exhaust bend 3 opening on the dial 6-1 of the measuring gauge 6, the thickness specification of the conical sealing ring 2 required between the exhaust bend 3 on the left and right sides of the connecting pipeline and the pulse converter 4 and the exhaust main pipe 1 is selected. The thickness specification of the conical sealing ring 2 includes not only the standard thickness but also low thickness and high thickness. Low thickness and high thickness are relative to the standard thickness, that is, the low thickness is thinner than the standard thickness and the high thickness is thicker than the standard thickness.

[0039] When determining the required thickness of the conical sealing ring 2 between the left and right exhaust bends 3 and the pulse converter 4, observe the offset of the pipe openings of the left and right exhaust bends 3 on the scale 6-1, that is, the offset of the pipe openings of the exhaust bends 3 relative to their corresponding baseline 6-2. When the pipe openings of the exhaust bends 3 are aligned on the scale 6-1, their corresponding baseline 6-2 is located exactly on the outer periphery of the pipe opening.

[0040] like Figure 6 As shown, when making the judgment, based on the baseline 6-2 on the dial 6-1, when the pipe opening of the left exhaust bend 3 shifts to the left or the pipe opening of the right exhaust bend 3 shifts to the right, it proves that the disc of the positioning sleeve 5 that replaces the standard thickness conical sealing ring 2 between the exhaust bend 3 and the pulse converter 4 is too thick. Therefore, a low-thickness conical sealing ring 2 should be selected on this side. When the pipe opening of the left exhaust bend 3 shifts to the right or the pipe opening of the right exhaust bend 3 shifts to the left, it proves that the disc of the positioning sleeve 5 that replaces the standard thickness conical sealing ring 2 between the exhaust bend 3 and the pulse converter 4 is too thin. Therefore, a high-thickness conical sealing ring 2 should be selected on this side. When neither the left nor right exhaust bend 3 shifts, it proves that the disc of the positioning sleeve 5 that replaces the standard thickness conical sealing ring 2 between the exhaust bend 3 and the pulse converter 4 is just right. Therefore, a standard thickness conical sealing ring 2 should be selected on this side.

[0041] When determining the required thickness of the conical sealing ring 2 between the left and right exhaust bends 3 and the exhaust main pipe 1, observe the lifting of the pipe openings of the left and right exhaust bends 3 on the dial 6-1.

[0042] like Figure 7 As shown, when making a judgment based on the dial 6-1, if the left side of the exhaust bend 3 or the right side of the exhaust bend 3 is tilted upwards, it proves that the dial 6-1 of the measuring gauge 6 that replaces the standard thickness conical sealing ring 2 between the exhaust bend 3 and the exhaust main pipe 1 is too thick. Therefore, a lower thickness conical sealing ring 2 should be selected on this side. If the right side of the exhaust bend 3 or the left side of the exhaust bend 3 is tilted upwards, it proves that the dial 6-1 of the measuring gauge 6 that replaces the standard thickness conical sealing ring 2 between the exhaust bend 3 and the exhaust main pipe 1 is too thin. Therefore, a higher thickness conical sealing ring 2 should be selected on this side. If neither the left nor right exhaust bend 3 is tilted upwards, it proves that the dial 6-1 of the measuring gauge 6 that replaces the standard thickness conical sealing ring 2 between the exhaust bend 3 and the exhaust main pipe 1 is a perfect match. Therefore, a standard thickness conical sealing ring 2 should be selected on this side.

[0043] Step S4: Install conical sealing ring 2: Disassemble the positioning sleeve 5 and measuring gauge 6 between the left and right exhaust bends 3 and pulse converter 4 and the exhaust main pipe 1 respectively, and install the conical sealing ring 2 of the thickness specification selected in step S3 at the corresponding position to complete the centering and sealing;

[0044] During installation, the connections must be made manually in sequence. First, use a torque wrench to alternately tighten the nuts on the clamping flange 7 at the connection between the exhaust bend 3 and the pulse converter 4 to 65 Nm. Then, use a torque wrench to alternately tighten the nuts or bolts on the clamping flange 7 at the connection between the exhaust bend 3 and the exhaust manifold 1 to 65 Nm. Finally, use a torque of 65 Nm to tighten the fixing bolts between the exhaust manifold 1 and the cylinder head.

[0045] This invention can quickly determine and select the appropriate size of the conical sealing ring 2 based on the gap distance and alignment between the exhaust bend 3, the exhaust manifold 1, and the pulse converter 4 during the installation process, ensuring the sealing and alignment of each connection point of the connecting pipeline. It is convenient and quick to operate, effectively saving the installation time between the various components of the entire connecting pipeline and improving the operating efficiency. At the same time, it can effectively reduce the assembly difficulty of the three components: exhaust manifold 1, exhaust bend 3, and pulse converter 4.

[0046] It is understood that the present invention has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. Furthermore, under the teachings of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of the present invention.

Claims

1. A method for centering and sealing a connecting pipe in a diesel engine exhaust system, characterized in that... Includes the following steps: Step S1: Align and install the pulse converter (4) onto the flywheel housing; Step S2: Install positioning sleeves (5) and measuring gauges (6) on the left and right sides of the connecting pipe respectively to replace the standard thickness conical sealing rings (2). The positioning sleeves (5) and measuring gauges (6) are both disc structures with a connecting end on one side. During installation, first install the disc of the positioning sleeve (5) onto the connecting port of the pulse converter (4), and at the same time insert the connecting end of the measuring gauge (6) into one end of the exhaust main pipe (1). Then, insert one end of the exhaust bend (3) into the connecting end of the positioning sleeve (5), and finally press along the bend direction of the exhaust bend (3) so that the other end of the pipe abuts against the disc of the measuring gauge (6). Step S3: Determine and select the thickness specifications of the conical sealing rings (2) required for each connection in the connecting pipeline: By judging the offset and tilting of the exhaust bend (3) on the disc of the measuring gauge (6), select the thickness specifications of the conical sealing rings (2) required between the exhaust bends (3) on the left and right sides of the connecting pipeline and the pulse converter (4) and the exhaust main pipe (1). The thickness specifications of the conical sealing rings (2) include not only the standard thickness but also low thickness and high thickness. Step S4: Install the conical sealing ring (2): Disassemble the positioning sleeve (5) and measuring gauge (6) between the left and right exhaust bends (3) and pulse converter (4) and exhaust main pipe (1), and install the conical sealing ring (2) of the thickness specification selected in step S3 at the corresponding position to complete the centering and sealing.

2. The alignment and sealing method for a diesel engine exhaust system connecting pipe according to claim 1, characterized in that: In step S2, the disk thickness of the positioning sleeve (5) and the measuring gauge (6) is the same as the flat end thickness of the standard thickness conical sealing ring (2).

3. The alignment and sealing method for a diesel engine exhaust system connecting pipe according to claim 2, characterized in that: The measuring gauge (6) has a dial (6-1) with several reference lines (6-2) set concentrically on its surface. The reference lines (6-2) are adapted to exhaust bends (3) of different diameters.

4. The alignment and sealing method for a diesel engine exhaust system connecting pipe according to claim 3, characterized in that: In step S3, when determining the thickness specification of the required conical sealing ring (2) between the left and right exhaust bends (3) and the pulse converter (4), observe the offset of the pipe openings of the left and right exhaust bends (3) relative to the corresponding baseline (6-2) on the dial (6-1).

5. The alignment and sealing method for a diesel engine exhaust system connecting pipe according to claim 4, characterized in that: Based on the baseline (6-2) on the dial (6-1), when the opening of the left exhaust bend (3) shifts to the left or the opening of the right exhaust bend (3) shifts to the right, a low-thickness conical sealing ring (2) is selected; when the opening of the left exhaust bend (3) shifts to the right or the opening of the right exhaust bend (3) shifts to the left, a high-thickness conical sealing ring (2) is selected; when neither the left nor the right exhaust bend (3) shifts, a standard-thickness conical sealing ring (2) is selected.

6. The alignment and sealing method for a diesel engine exhaust system connecting pipe according to claim 3, characterized in that: In step S3, when determining the thickness specifications of the required conical sealing ring (2) between the left and right exhaust bends (3) and the exhaust main pipe (1), observe the lifting of the pipe openings of the left and right exhaust bends (3) on the dial (6-1).

7. The alignment and sealing method for a diesel engine exhaust system connecting pipe according to claim 6, characterized in that: Based on the dial (6-1), when the left side of the exhaust bend (3) is raised or the right side of the exhaust bend (3) is raised, a low-thickness conical sealing ring (2) is selected; when the right side of the exhaust bend (3) is raised or the left side of the exhaust bend (3) is raised, a high-thickness conical sealing ring (2) is selected; when neither the left nor the right exhaust bend (3) is raised, a standard-thickness conical sealing ring (2) is selected.

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