Exhaust pipe shield assembly capable of preventing weld cracking

Abstract

The present invention discloses an exhaust pipe shield assembly capable of preventing weld cracking, comprising an exhaust pipe and a heat shield, wherein an air outlet and a first air inlet are respectively arranged at two ends of the exhaust pipe, a plurality of second air inlets are arranged on the side wall of the exhaust pipe, an air intake branch pipe is fixed on the second air inlet, a plurality of connecting plates are also arranged on the side wall of the exhaust pipe, the heat shield comprises a shield body and a connecting strip, a plurality of first notches and second notches for the air intake branch pipe and the connecting plate to extend out are respectively arranged on the shield body, the connecting strip comprises an arc segment and extension segments located at both ends of the arc segment, two shield bodies are respectively covered on the outside of the exhaust pipe and assembled into an insulating outer layer, the connecting strip is located between adjacent surfaces of the two shield bodies and the extension segments are respectively welded and fixed to the two shield bodies, and the bending caused by the extrusion of the arc segment is utilized to absorb thermal expansion and reduce the effect of thermal stress.

Description

[Technical field]

[0001] The invention relates to the technical field of automobile exhaust pipe systems, in particular to the technical field of an exhaust pipe shield assembly capable of preventing weld cracking. [Background technology]

[0002] The automobile exhaust system is used to discharge the exhaust gas discharged by the engine, while reducing noise and exhaust gas pollution. When the automobile exhaust pipe system discharges exhaust gas, the large amount of heat carried by the exhaust gas will heat the exhaust pipe, causing the surface temperature of the exhaust pipe to reach 500-600℃. Due to the limited space of the automobile chassis, most of the components around the automobile exhaust pipe system are close to the automobile exhaust pipe, and the normal operation of the surrounding components has strict requirements on temperature. If the temperature is high, it is easy to cause safety accidents. Therefore, it is necessary to install a heat shield outside the exhaust pipe. At present, the heat shield welded on the exhaust pipe usually uses the front and back welding method or the left and right welding method. When the exhaust gas is discharged, due to the inconsistent temperature of the front and back of the automobile exhaust pipe, the welds between the exhaust pipes are heated and expanded to different degrees, and there are unequal thermal stresses. Therefore, after being vibrated, the welds are prone to cracking, and in severe cases, the heat shield may even fall off the exhaust pipe. [Summary of the invention]

[0003] The purpose of the present invention is to solve the problems in the prior art and to provide an exhaust pipe shield assembly that can prevent weld cracking and can utilize the bending caused by the extrusion of the arc segment to absorb thermal expansion and reduce thermal stress.

[0004] To achieve the above-mentioned purpose, the present invention proposes an exhaust pipe shield assembly that can prevent weld cracking, including an exhaust pipe and a heat insulation shield, wherein the two ends of the exhaust pipe are respectively provided with an air outlet and a first air inlet, and the side wall of the exhaust pipe is provided with a plurality of second air inlets, and the second air inlet is fixed with an air intake branch pipe, and the side wall of the exhaust pipe is also provided with a plurality of connecting plates, and the heat insulation shield includes a shield body and a connecting strip, and the shield body is respectively provided with a plurality of first notches and second notches for the air intake branch pipes and the connecting plates to extend out, and the connecting strip includes an arc segment and extension segments located at both ends of the arc segment, and the two shield bodies are respectively covered on the outside of the exhaust pipe and assembled into an insulating outer layer, and the connecting strip is located between adjacent surfaces of the two shield bodies and the extension sections are respectively welded and fixed to the two shield bodies.

[0005] Preferably, a first slot is provided at the end of the cover body, and the extension section is inserted into the first slot.

[0006] Preferably, a first protrusion is provided on the side surface of the extension section, a plurality of first recesses adapted to the first protrusion are provided on the inner wall of the first slot, and a first guiding slope is provided at the entrance end of the first slot.

[0007] Preferably, an insert strip is provided at one end of the cover body, and a second slot adapted to the insert strip is provided at the other end of the cover body, and the insert strip is inserted into the second slot of the other cover body.

[0008] Preferably, a second protrusion is provided on the side of the inserting strip, a plurality of second recesses adapted to the second protrusion are provided on the inner wall of the second slot, and a second guiding slope is provided at the entrance end of the second slot.

[0009] Preferably, a plurality of first grooves are respectively provided on the outer side surface of the arc segment, and a plurality of second grooves are respectively provided on the inner side surface of the arc segment.

[0010] Preferably, a plurality of the first grooves and the second grooves are arranged at the center of the arc segment.

[0011] The beneficial effects of the present invention are as follows: the present invention clamps two separate cover bodies from the upper and lower sides respectively, so as to form an insulating outer layer outside the exhaust pipe, and then clamps the two cover bodies together and welds them through a connecting strip to complete the final fixation of the heat insulation cover. The overall installation is firm and fast, and the heat loss at the connection of the cover bodies is small; by arranging an arc segment on the connecting strip, the bending generated by the extrusion of the arc segment is utilized to absorb thermal expansion, reduce the thermal stress, and thus avoid cracking of the weld due to different degrees of thermal expansion; by arranging a plurality of grooves on the inner and outer sides of the center of the arc segment, the bending of the arc segment is assisted, and the bending property of the arc segment is effectively enhanced; by the mutual cooperation of the protrusion and the recess, the insertion depth of the insert or the extension section is adjusted, so as to control the size of the gap between the adjacent surfaces of the two cover bodies or the pre-bending degree of the bent section.

[0012] The features and advantages of the present invention will be described in detail through embodiments in conjunction with the accompanying drawings.

Brief Description of the Drawings

[0013] Figure 1 It is a front view of an exhaust pipe shield assembly capable of preventing weld cracking according to the present invention;

[0014] Figure 2 It is a bottom view of an exhaust pipe shield assembly capable of preventing weld cracking according to the present invention;

[0015] Figure 3 It is a top view of an exhaust pipe of an exhaust pipe shield assembly capable of preventing weld cracking according to the present invention;

[0016] Figure 4 yes Figure 2 AA section view;

[0017] Figure 5 yes Figure 4 An enlarged schematic diagram of point B.

[0018] In the figure: 1-exhaust pipe, 11-air outlet, 12-first air inlet, 13-inlet branch pipe, 14-connecting plate, 2-heat insulation cover, 21-cover body, 211-first slot, 2111-first recess, 2112-first guide slope, 212-second slot, 2121-second recess, 2122-second guide slope, 213-insertion strip, 2131-second protrusion, 22-connecting strip, 221-arc section, 2211-first groove, 2212-second groove, 222-extension section, 2221-first protrusion. [Specific implementation method]

[0019] See also Figures 1 to 5 The present invention discloses an exhaust pipe shield assembly capable of preventing weld cracking, comprising an exhaust pipe 1 and a heat shield 2, wherein the exhaust pipe 1 is provided with an air outlet 11 and a first air inlet 12 at both ends thereof, a plurality of second air inlets are provided on the side wall of the exhaust pipe 1, an air inlet branch 13 is fixed on the second air inlet, a plurality of connecting plates 14 are further provided on the side wall of the exhaust pipe 1, the heat shield 2 comprises a shield body 21 and a connecting strip 22, a plurality of air inlet branch 13 and a connecting plate 14 are provided on the shield body 21 The first notch and the second notch protruded, the connecting strip 22 includes an arc segment 221 and an extension segment 222 located at both ends of the arc segment 221, the two cover bodies 21 are respectively covered on the outside of the exhaust pipe 1 and assembled into an insulating outer layer, the connecting strip 22 is located between the adjacent surfaces of the two cover bodies 21 and the extension segment 222 is respectively welded and fixed to the two cover bodies 21, the end of the cover body 21 is provided with a first slot 211, the extension segment 222 is inserted into the first slot 211, and the extension segment 222 is inserted into the first slot 211. The side of the segment 222 is provided with a first protrusion 2221, the inner wall of the first slot 211 is provided with a plurality of first notches 2111 adapted to the first protrusion 2221, the entrance end of the first slot 211 is provided with a first guiding slope 2112, one end of the cover body 21 is provided with an inserting strip 213, the other end of the cover body 21 is provided with a second slot 212 adapted to the inserting strip 213, the inserting strip 213 is inserted into the second slot 212 of the other cover body 21, and the side of the inserting strip 213 is provided with a first guide slope 2112. A second protrusion 2131 is provided on the surface, a plurality of second recesses 2121 adapted to the second protrusion 2131 are provided on the inner wall of the second slot 212, a second guide slope 2122 is provided at the entrance end of the second slot 212, a plurality of first grooves 2211 are respectively provided on the outer surface of the arc segment 221, a plurality of second grooves 2212 are respectively provided on the inner side surface of the arc segment 221, and the plurality of first grooves 2211 and second grooves 2212 are all arranged in the center of the arc segment 221.

[0020] Working process of the present invention:

[0021] During the installation process, firstly, the two cover bodies 21 are respectively placed on the upper and lower sides of the outer wall of the exhaust pipe 1, so that the insertion strip 213 is inserted into the second slot 212 of the other cover body 21, and the second protrusion 2131 is engaged with the second notch 2121 as required, so as to adjust the insertion depth of the insertion strip 213. Subsequently, the two extension sections 222 of the connecting strip 22 are respectively inserted into the first slot 211 of the cover body 21 located at the upper and lower sides, and the first protrusion 2221 is engaged with the first notch 2111 as required, so as to adjust the insertion depth of the extension section 222. Then, the extension section 222 is welded to the cover body 21. During use, the exhaust pipe 1 is installed in the vehicle through the connecting plate 14, and the first air inlet 12 and the plurality of air inlet branches 13 are respectively connected to the plurality of cylinders to complete the air intake.

[0022] The present invention clamps two separate cover bodies from upper and lower sides respectively, so as to form a heat-insulating outer layer outside the exhaust pipe, and then clamps and welds the two cover bodies through a connecting strip to complete the final fixation of the heat-insulating cover. The overall installation is firm and fast, and the heat loss at the connection of the cover bodies is small. By arranging an arc segment on the connecting strip, the bending generated by the extrusion of the arc segment is utilized to absorb thermal expansion, reduce the thermal stress, and thus avoid cracking of the weld due to different degrees of thermal expansion. By arranging a plurality of grooves on the inner and outer sides of the center of the arc segment, the bending of the arc segment is assisted, and the bending property of the arc segment is effectively enhanced. By the mutual cooperation of the protrusion and the recess, the insertion depth of the insert strip or the extension section is adjusted, so as to control the size of the gap between the adjacent surfaces of the two cover bodies or the pre-bending degree of the bending section.

[0023] The above embodiments are intended to illustrate the present invention, not to limit the present invention. Any solution that is a simple transformation of the present invention belongs to the protection scope of the present invention.

Claims

1. An exhaust pipe shield assembly capable of preventing weld cracking, characterized in that: The invention comprises an exhaust pipe (1) and a heat insulation cover (2), wherein the exhaust pipe (1) is provided with an air outlet (11) and a first air inlet (12) at two ends thereof, a plurality of second air inlets are provided on the side wall of the exhaust pipe (1), an air inlet branch pipe (13) is fixed on the second air inlet, and a plurality of connecting plates (14) are also provided on the side wall of the exhaust pipe (1), the heat insulation cover (2) comprises a cover body (21) and a connecting strip (22), the cover body (21) is provided with a plurality of first notches and second notches for the air inlet branch pipe (13) and the connecting plate (14) to extend out, the connecting strip (22) comprises an arc segment (221) and extension segments (222) located at two ends of the arc segment (221), the two cover bodies (21) are respectively covered on the outside of the exhaust pipe (1) and assembled into a heat insulation outer layer, the connecting strip (22) is located between the two cover bodies (21) and the heat insulation cover (2) The extension section (222) is welded and fixed to the two cover bodies (21) respectively between adjacent surfaces of the cover body (21); a first slot (211) is provided at the end of the cover body (21), and the extension section (222) is inserted into the first slot (211); a first protrusion (2221) is provided on the side of the extension section (222); a plurality of first recesses (2111) adapted to the first protrusion (2221) are provided on the inner wall of the first slot (211); a first guiding inclined surface (2112) is provided at the entrance end of the first slot (211); an insertion strip (213) is provided at one end of the cover body (21), and a second slot (212) adapted to the insertion strip (213) is provided at the other end of the cover body (21), and the insertion strip (213) is inserted into the second slot (212) of the other cover body (21).

2. An exhaust pipe shield assembly capable of preventing weld cracking as claimed in claim 1, characterized in that: A second protrusion (2131) is provided on the side of the inserting strip (213), a plurality of second recesses (2121) adapted to the second protrusion (2131) are provided on the inner wall of the second slot (212), and a second guiding inclined surface (2122) is provided at the entrance end of the second slot (212).

3. An exhaust pipe shield assembly capable of preventing weld cracking as claimed in claim 1, characterized in that: A plurality of first grooves (2211) are respectively provided on the outer side surface of the arc-shaped segment (221), and a plurality of second grooves (2212) are respectively provided on the inner side surface of the arc-shaped segment (221).

4. An exhaust pipe shield assembly capable of preventing weld cracking as claimed in claim 3, characterized in that: A plurality of the first grooves (2211) and the second grooves (2212) are all arranged at the center of the arc segment (221).

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