A connection for an exhaust duct hot end

Abstract

The utility model relates to a connecting piece for exhaust pipeline hot end includes connecting portion and fastener, the partial outer edge of one end of two buckling parts away from each other extends to the outside and extends to the limit portion, the recessed portion that recessed portion's inner wall and the inner wall of limit portion surround and form the abutment groove, will the nut be fixed in the abutment groove, passes through the first through -hole of two buckling parts with bolt, rotates the bolt to pass through the nut, the nut is screwed on the bolt, rotates the bolt to make two buckling parts close to each other, and the connecting portion fastens two preconnected pipelines, and the pipeline produces slight vibration in the working state, and the lower end of two recessed portions abuts the front and back sides of the nut, and the upper end of limit portion abuts the nut, so that it is fixed in the abutment groove, and the circumferential rotation and vertical motion of the nut are limited, and vibration is converted into the friction dissipation of the contact surface in the abutment groove, and the relative motion of non threaded pair, guarantee the long -term fastening force of pipeline, and the service life of connecting piece has been improved.

Description

Technical Field

[0001] This utility model relates to the field of connector technology, and in particular to a connector for the hot end of an exhaust pipe. Background Technology

[0002] Existing connectors for the hot end of exhaust pipes include a connecting part, a fastening part, a bolt, and a nut. The connecting part is fitted onto the connection between two pre-connected pipes. The bolt passes through the two fastening parts and is then screwed onto the bolt with a nut. Rotating the nut causes the two fastening parts to come closer together, and the connecting part secures the two pre-connected pipes. The fastening part is flat, and the inner surfaces of the nut and bolt only contact the outer surfaces of the two fastening parts. When the exhaust pipe is in operation, the two pipes will vibrate, causing the nut to experience slight thread displacement on the bolt and loosen. This makes it impossible to maintain the fastening force for a long time, affecting the connection strength of the two pipes.

[0003] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model discloses a connector for the hot end of an exhaust pipe, which solves the problem that when the exhaust pipe is in operation, vibration between the two pipes causes slight thread displacement and loosening of the nut on the bolt, making it impossible to maintain the fastening force for a long time and affecting the connection strength of the two pipes.

[0005] The technical solution adopted in this utility model is as follows: A connector for the hot end of an exhaust pipe, characterized in that it comprises: The connecting part is a ring structure with an opening at its upper end. At both ends of the connecting part corresponding to the opening, there are fastening portions extending toward the upper end of the connecting part. Two fastening portions have corresponding first through holes. A limiting portion extends outward from the outer edge of one of the two fastening portions at a distance from each other. Recesses are formed on both the front and rear sides of the lower end of the limiting portion, recessing toward the first through holes. The inner wall of the recessed portion and the inner wall of the limiting portion form an abutment groove. The fastener includes a bolt and a nut. The left end of the bolt is fixed in one of the abutment grooves, and the right end of the bolt passes through two of the first through holes. The nut is threaded to the right end of the bolt and fixed in another abutment groove. The two recesses abut against the front and rear sides of the lower end of the nut.

[0006] A further technical solution is that a guide portion is provided around the circumference of the first through hole at one end of the two fastening parts that are close to each other.

[0007] A further technical solution is that the fastener further includes a pad, the pad being cylindrical, the pad having a second through hole along the extension direction of the bolt, the bolt thread passing through the second through hole and two first through holes in sequence, and the pad being fixed between the bolt head and one of the fastening portions.

[0008] A further technical solution is that the cross-section of the connecting part includes a planar segment and two sidewalls. The two sidewalls are symmetrically arranged on the front and rear sides of the inner side of the planar segment, and the two sidewalls and the planar segment enclose and form a snap-fit ​​groove.

[0009] A further technical solution is that the front and rear sides of the lower end of the fastening part are provided with fitting parts, the two fitting parts are respectively fitted to the two side walls, and the upper end of the fitting part is connected to the lower end of the recessed part.

[0010] A further technical solution is that the fitting part, the recessed part, and the limiting part are integrally formed.

[0011] A further technical solution is that the angle at the connection between the sidewall and the planar segment is less than 135° and greater than or equal to 90°.

[0012] A further technical solution is that the sidewall is provided with a number of notches spaced circumferentially, and the notches on the two sidewalls are symmetrical to each other.

[0013] The beneficial effects of this utility model embodiment are as follows: (i) A connector for the hot end of an exhaust pipe includes a connecting part and a fastener. The connecting part is fitted onto the connection of two pre-connected pipes. The outer edge of the two fastening parts at their opposite ends extends outward to a limiting part. The front and rear sides of the lower end of the limiting part are both recessed towards a first through hole. The inner wall of the recessed part and the inner wall of the limiting part form an abutment groove. First, the nut is fixed in the abutment groove. The bolt is passed through the first through hole of the two fastening parts. The bolt is rotated and passes through the nut, so that the nut is screwed onto the bolt. Rotating the bolt causes the two fastening parts to come closer together. The connecting part fastens the two pre-connected pipes. When the pipe vibrates slightly during operation, the two recessed parts abut against the front and rear sides of the lower end of the nut, and the limiting part abuts against the upper end of the nut, fixing it in the abutment groove. This restricts the circumferential rotation and vertical movement of the nut. The vibration is converted into frictional dissipation of the contact surface in the abutment groove, rather than the relative movement of the threaded pair, ensuring the long-term fastening force of the pipe and improving the service life of the connector.

[0014] (ii) Furthermore, the lower end of the fastening part is provided with fitting parts on both the front and rear sides, with the two fitting parts respectively fitting the two side walls, and the upper end of the fitting parts connecting to the lower end of the recessed part. For example, the fitting parts, recessed parts, and limiting parts are integrally formed. As a key force-transmitting component connecting the side walls and the fastening part, the fitting part can effectively transmit the axial tensile force of the bolt to both side walls when the fastener is tightened, guiding the fastening part to produce balanced elastic bending deformation to achieve a tight closure. Simultaneously, the integrally formed structure with the limiting part enhances the overall strength and deformation resistance of the stress concentration area.

[0015] (iii) Furthermore, the angle at the connection between the sidewall and the planar section is less than 135° and greater than or equal to 90°. By sharpening the wrapping angle to form a tighter curved surface fit, the elastic pre-tightening force of the sidewall is used to compensate for the radial gap caused by the thermal expansion of the pipeline under high temperature conditions at the hot end, maintaining the sealing of the connection and improving the thermal fatigue life of the structure.

[0016] (iv) Furthermore, the sidewall is provided with several notches spaced circumferentially, and the notches on the two sidewalls are symmetrical to each other. Under the high temperature conditions at the hot end, the sidewall is induced to undergo elastic bending deformation preferentially along the notches, which not only absorbs the radial expansion stress generated by the thermal expansion of the pipeline, but also maintains the overall bending stiffness of the sidewall through the connection between the notches.

[0017] (v) Furthermore, the connector design is more compact, saving more space in the car chassis, and the connector design is lighter, improving the overall lightweighting of the exhaust system. Finally, the connector design has lower process costs compared to flanges, saving the cost of pipe connection. Attached Figure Description

[0018] Figure 1 This is an isometric view of a connector for the hot end of an exhaust pipe according to the present invention.

[0019] Figure 2 This is a front view structural diagram of a connector for the hot end of an exhaust pipe according to the present invention.

[0020] Figure 3 This is a top view of the connecting component for the hot end of an exhaust pipe according to the present invention.

[0021] In the picture: 100. Connecting part; 110. Flat section; 120. Side wall; 130. Snap-fit ​​groove; 140. Fastening part; 150. Limiting part; 160. Recessed part; 170. Fitting part; 180. Abutment groove; 190. Guide part; 200. Fastener; 210. Bolt; 220. Nut; 230. Spacer; 300. Notch. Detailed Implementation

[0022] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0023] Currently, the design of chassis systems for new energy vehicles equipped with two power systems occupies most of the chassis space, limiting the design space for other chassis components. The traditional exhaust pipe connection method generally uses flanges welded to the ends of the exhaust pipes to align the two heavy flanges and connect them with several bolts and nuts. The installation under the traditional process makes the product heavier, and the flanges used for docking according to the chassis system design occupy even more space. At the same time, the installation efficiency is low due to the fixed connection by bolts and nuts. Based on this, the inventors of this application provide the following embodiments.

[0024] Example: A connector for the hot end of an exhaust pipe includes a connector 100 and a fastener 200.

[0025] like Figures 1-3 As shown, the connecting portion 100 has an annular structure, and an opening is provided at the upper end of the connecting portion 100. Exemplarily, the cross-section of the connecting portion 100 includes a planar segment 110 and two sidewalls 120. The two sidewalls 120 are symmetrically arranged on the front and rear sides of the inner side of the planar segment 110, and the two sidewalls 120 and the planar segment 110 enclose to form a snap-fit ​​groove 130. At both ends of the connecting portion 100 corresponding to the opening, a fastening portion 140 extending towards the upper end of the connecting portion 100 is formed. Corresponding first through holes are provided on the two fastening portions 140. A limiting portion 150 extends outward from the outer edge of the two fastening portions 140 at their opposite ends. Recessed portions 160 are formed on both the front and rear sides of the lower end of the limiting portion 150, recessed towards the first through holes. The inner wall of the recessed portion 160 and the inner wall of the limiting portion 150 enclose to form an abutment groove 180.

[0026] like Figures 1-3 As shown, the fastener 200 includes a bolt 210 and a nut 220. The left end of the bolt 210 is fixed in an abutment groove 180, and the right end of the bolt 210 passes through two first through holes. The nut 220 is threaded to the right end of the bolt 210 and fixed in another abutment groove 180. Two recesses 160 abut against the front and rear sides of the lower end of the nut 220.

[0027] like Figures 1-3As shown, furthermore, the lower end of the fastening portion 140 is provided with fitting portions 170 on both the front and rear sides. The two fitting portions 170 respectively fit the two side walls 120, and the upper end of the fitting portion 170 is connected to the lower end of the recessed portion 160. Exemplarily, the fitting portion 170, the recessed portion 160 and the limiting portion 150 are integrally formed. As a key force transmission component connecting the side wall 120 and the fastening portion 140, the fitting portion 170 can effectively transmit the axial tensile force of the bolt 210 to the two side walls 120 when the fastener 200 is tightened, guiding the fastening portion 140 to produce balanced elastic bending deformation to achieve tight closure. At the same time, the integrally formed structure with the limiting portion 150 enhances the overall strength and deformation resistance of the stress concentration area.

[0028] like Figures 1-3 As shown, further, a guide portion 190 is provided around the circumference of the first through hole at the end of the two fastening portions 140 that are close to each other. The guide portion 190, which is provided around the circumference of the first through hole at the end of the two fastening portions 140 that are close to each other, automatically corrects the axial offset when the bolt 210 is inserted through its flared structure, and guides the bolt 210 to move along a preset path during the tightening process. It works in conjunction with the elastic deformation of the contact portion 170 of the fastening portion 140 to make the two fastening portions 140 close with balanced force, avoiding plastic deformation caused by stress concentration on one side.

[0029] like Figures 1-3 As shown, the fastener 200 further includes a spacer 230, which is cylindrical. The spacer 230 has a second through hole along the extension direction of the bolt 210. The bolt 210's thread passes sequentially through the second through hole, a first through hole, a guide portion 190, another guide portion 190, and another first through hole. The spacer 230 is fixed between the bolt head and a fastening portion 140. The cylindrical spacer 230, through its second through hole and precise fit with the bolt 210, forms a transition structure between the bolt head and the fastening portion 140. The surface contact between the end face of the spacer 230 and the fastening portion 140 evenly distributes the preload of the bolt 210 to the outer surface of the fastening portion 140, preventing localized plastic deformation caused by the bolt head edge directly pressing against the fastening portion 140.

[0030] like Figure 3 As shown, furthermore, the angle at the connection between the sidewall 120 and the planar segment 110 is less than 135° and greater than or equal to 90°. By sharpening the wrapping angle to form a tighter curved surface fit, the elastic preload of the sidewall 120 is used to compensate for the radial gap caused by the thermal expansion of the pipeline under high-temperature conditions at the hot end, maintaining the sealing of the connection and improving the thermal fatigue life of the structure.

[0031] like Figures 1-3As shown, furthermore, the sidewall 120 is provided with several notches 300 spaced circumferentially, and the notches 300 on the two sidewalls 120 are symmetrical to each other. Under the high temperature condition at the hot end, the sidewall 120 is induced to undergo elastic bending deformation preferentially along the notches 300, which not only absorbs the radial expansion stress generated by the thermal expansion of the pipeline, but also maintains the overall bending stiffness of the sidewall 120 through the connection between the notches 300.

[0032] During installation, in this embodiment: The annular snap-fit ​​groove 130 of the connecting part 100 is fitted onto the joint of the two exhaust pipes to be connected, ensuring that the flat section 110 fits snugly against the outer wall of the pipe, and the two side walls 120 symmetrically wrap around the pipe. The two snap-fit ​​parts 140 are located on both sides of the opening and are in an open state. The nut 220 is inserted into the abutment groove 180 of the right snap-fit ​​part 140. The contour of the inner wall of the abutment groove 180 matches the hexagonal surface of the nut 220, so that the lower end of the nut 220 is engaged between the two recesses 160 on both sides. The axis of the nut 220 automatically aligns with the center of the first through hole. The second through hole of the cylindrical pad 230 is aligned with the left side. The first through hole of the fastening part 140 is used to install the pad 230. The bolt 210 is passed from left to right through the second through hole of the pad 230, the first through hole of the left fastening part 140, the left guide part 190, the right guide part 190, and the first through hole of the right fastening part 140. The bolt 210 is rotated so that the right end screw passes through the nut 220. The bolt 210 is rotated continuously, which drives the right fastening part 140 to move to the left. The two fastening parts 140 gradually close the opening through the elastic deformation of the fitting part 170. The tightening stops when the inner diameter of the connecting part 100 shrinks to an interference fit with the outer wall of the pipe.

[0033] In this embodiment, a tighter curved surface fit is achieved by sharpening the wrapping angle. Under high-temperature conditions at the hot end, the elastic preload of the 120° sidewall compensates for the radial gap caused by thermal expansion of the pipe, maintaining the sealing performance of the connector and improving the structure's thermal fatigue life. Furthermore, compared to traditional flange connection technology, the connector design in this embodiment is more compact, saving more space in the vehicle chassis. The connector is also lighter, improving the overall lightweighting of the exhaust system. Finally, the connector design is less expensive than flange technology, saving on pipe connection costs.

[0034] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A connector for the hot end of an exhaust pipe, characterized in that, include: The connecting part is a ring structure with an opening at its upper end. At both ends of the connecting part corresponding to the opening, there are fastening portions extending toward the upper end of the connecting part. Two fastening portions have corresponding first through holes. A limiting portion extends outward from the outer edge of one of the two fastening portions at a distance from each other. Recesses are formed on both the front and rear sides of the lower end of the limiting portion, recessing toward the first through holes. The inner wall of the recessed portion and the inner wall of the limiting portion form an abutment groove. The fastener includes a bolt and a nut. The left end of the bolt is fixed in one of the abutment grooves, and the right end of the bolt passes through two of the first through holes. The nut is threaded to the right end of the bolt and fixed in another abutment groove. The two recesses abut against the front and rear sides of the lower end of the nut.

2. The connector for the hot end of an exhaust pipe according to claim 1, characterized in that: A guide portion is provided around the circumference of the first through hole at one end of the two fastening parts that are close to each other.

3. The connector for the hot end of an exhaust pipe according to claim 1, characterized in that: The fastener also includes a pad, which is cylindrical and has a second through hole along the extension direction of the bolt. The bolt thread passes through the second through hole and two first through holes in sequence, and the pad is fixed between the bolt head and one of the fastening parts.

4. The connector for the hot end of an exhaust pipe according to claim 1, characterized in that: The cross-section of the connecting part includes a planar segment and two sidewalls. The two sidewalls are symmetrically located on the front and rear sides of the inner side of the planar segment, and the two sidewalls and the planar segment enclose and form a snap-fit ​​groove.

5. The connector for the hot end of an exhaust pipe according to claim 4, characterized in that: The lower end of the fastening part is provided with fitting parts on the front and rear sides, and the two fitting parts respectively fit the two side walls. The upper end of the fitting part is connected to the lower end of the recessed part.

6. The connector for the hot end of an exhaust pipe according to claim 5, characterized in that: The fitting part, the recessed part, and the limiting part are integrally formed.

7. The connector for the hot end of an exhaust pipe according to claim 4, characterized in that: The angle at the connection between the sidewall and the planar segment is less than 135° and greater than or equal to 90°.

8. The connector for the hot end of an exhaust pipe according to claim 7, characterized in that: The sidewall has several notches spaced circumferentially, and the notches on two sidewalls are symmetrical to each other.

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