A three-way catalyst

Abstract

This application relates to the field of three-way catalytic converter equipment, and in particular to a three-way catalytic converter, which includes a cylindrical shell, an exhaust manifold and a connecting pipe respectively disposed at both ends of the shell, and a connection structure for detachably connecting the exhaust manifold and the connecting pipe to the shell respectively. The connection structure includes two first flanges integrally formed on both ends of the shell, a second flange integrally formed on the exhaust manifold, a third flange integrally formed on the connecting pipe, a connecting groove for covering the first flange and the second flange and the first flange and the third flange that fit together, a locking member disposed on the outer wall of the connecting groove, and a locking pin that can pass through the connecting groove and be locked to the locking member from the outer wall of the connecting groove on the side away from the locking member, thereby achieving the effect of facilitating the cleaning and replacement of the ceramic carrier inside the three-way catalytic converter shell.

Description

Technical Field

[0001] This application relates to the field of three-way catalytic converter devices, and in particular to a three-way catalytic converter. Background Technology

[0002] Currently, the three-way catalytic converter is the most important external purification device installed in the automotive exhaust system. It can convert harmful gases such as CO (carbon monoxide), HC (hydrocarbons), and NOx (nitrogen oxides) emitted from vehicle exhaust into harmless carbon dioxide, water, and nitrogen through oxidation and reduction reactions. Because this catalytic converter can simultaneously convert the three main harmful substances in exhaust gas into harmless substances, it is called a three-way catalytic converter.

[0003] The existing three-way catalytic converter includes a housing, a ceramic carrier disposed inside the housing, a connecting pipe welded to the outlet end of the housing, and an exhaust manifold welded to the intake end of the housing. The exhaust manifold has at least two ports at the end away from the housing, and the ports are connected to the engine cylinders to concentrate the exhaust from each cylinder into the housing.

[0004] The existing technical solutions mentioned above have the following drawbacks: when it is necessary to clean or replace the ceramic carrier inside the housing, it is necessary to cut along the transition position between the exhaust manifold and the housing in order to clean or replace the ceramic carrier. After cleaning and replacement, it is necessary to weld the exhaust manifold and the housing together. The overall operation is inconvenient and the work efficiency is low. Utility Model Content

[0005] This application provides a three-way catalytic converter to facilitate the cleaning and replacement of the ceramic carrier inside the three-way catalytic converter housing.

[0006] The above-mentioned technical objective of this application is achieved through the following technical solution:

[0007] A three-way catalytic converter includes a cylindrical housing, an exhaust manifold and a connecting pipe respectively disposed at both ends of the housing, and a connection structure for detachably connecting the exhaust manifold and the connecting pipe to the housing respectively.

[0008] The connection structure includes two first flanges integrally machined on both ends of the housing, a second flange integrally machined on the exhaust manifold, a third flange integrally machined on the connecting pipe, a connecting groove for covering the fitting first flange and the second flange and the first flange and the third flange, a locking member provided on the outer wall of the connecting groove, and a locking pin that can pass through the connecting groove and be locked to the locking member from the outer wall of the connecting groove away from the locking member.

[0009] By adopting the above technical solution, the detachable connection structure composed of the first flange, second flange, third flange, connecting groove, locking element and locking pin realizes the quick disassembly and assembly between the exhaust manifold, housing and connecting pipe, which facilitates the cleaning or replacement of the ceramic carrier inside the housing, and avoids the problems of inconvenience and low work efficiency caused by traditional welding methods. At the same time, the connecting groove is fastened to the flange so that the two adjacent flanges fit tightly, which can also improve the overall sealing performance of the three-way catalytic converter.

[0010] Optionally, the locking component includes a mounting tube fixed to the outer wall of the connecting groove, a mounting shell with one end fixed to and connected to the outer wall of the mounting tube, a pull rod slidably disposed in the mounting shell, a compression spring sleeved on the pull rod and located in the mounting shell, and a locking block disposed at one end of the pull rod and extending into the mounting tube. When the locking block can engage with the locking pin, the compression spring is in a compressed state.

[0011] By adopting the above technical solution, the locking structure of the mounting tube, mounting shell, pull rod, compression spring and locking block utilizes the elastic force of the compression spring to push the locking block into the locking pin slot, realizing the self-locking function of the connection structure, ensuring the stability and reliability of the connection, and simplifying the operation steps.

[0012] Optionally, the locking pin includes a pin rod, a circular plate disposed at one end of the pin rod, and a fastening spring sleeved on the pin rod. A slot adapted to the locking block is formed on the circumferential surface of the pin rod. When the locking block is located in the slot, the fastening spring is in a compressed state.

[0013] By adopting the above technical solution, a slot is set on the pin of the locking pin, and with the preload of the fastening spring, the fastening spring is in a compressed state when the locking block is inserted into the slot. This not only ensures the locking firmness, but also provides the necessary buffering effect, reduces the rigid impact between components, and extends the service life.

[0014] Optionally, the end of the mounting shell away from the mounting tube is a closed end with a square hole, the end face of the pull rod is rectangular and fits the square hole, and the side of the card block away from the mounting shell is machined with an inclined surface, which faces away from the mounting shell and towards the outer wall of the connecting groove.

[0015] By adopting the above technical solution, the end of the mounting shell away from the mounting tube is set as a closed end and a square hole is opened. Combined with the rectangular end face of the pull rod, the rotation of the pull rod during movement is effectively prevented, ensuring accurate alignment of the locking block and the locking pin slot. The design of the inclined surface of the locking block facilitates the insertion of the locking pin and the retraction of the locking block, improving the smoothness of assembly.

[0016] Optionally, the pin is a round rod, and multiple slots are spaced apart around the pin's axis.

[0017] By adopting the above technical solution, multiple slots are opened at intervals on the circumference of the pin, which increases the opportunity for the locking block and the locking pin to cooperate, allowing the locking pin to achieve effective locking at different insertion depths, thereby improving the fault tolerance and flexibility of the assembly.

[0018] Optionally, the connecting groove is semi-circular, and the two connecting grooves are fastened to the rear end face of the first flange and fit together.

[0019] By adopting the above technical solution, the connecting groove is designed as a semi-circular arc, and the rear faces of the two connecting grooves are fitted together to form a wrapping connection to the flange, which increases the contact area and improves the stability and sealing performance of the connection.

[0020] Optionally, the outer wall of the connecting groove is provided with a pin hole for the pin rod to pass through, and the first flange, the second flange and the third flange are provided with a through hole for the pin rod to pass through.

[0021] By adopting the above technical solution, pin holes are opened on the outer wall of the connecting groove, and corresponding through holes are opened on each flange, providing a precise through path for the locking pin. This ensures that the locking pin can pass smoothly through all components and accurately match the locking parts, thereby improving the accuracy and efficiency of assembly.

[0022] Optionally, the first flange, the second flange, and the third flange are provided with positioning grooves, and the inner wall of the groove of the connecting groove is provided with a positioning protrusion that matches the positioning groove. After the positioning protrusion is inserted into the positioning groove, the pin hole is connected to the through hole.

[0023] By adopting the above technical solution and setting a matching structure of positioning groove and positioning convex plate, preliminary positioning is achieved when the connecting groove is engaged, ensuring that the pin hole and the through hole are automatically aligned, avoiding the trouble of manual adjustment, and improving the convenience and accuracy of assembly.

[0024] Optionally, the exhaust manifold is an integrally formed cast manifold, including a first connecting cover, a first manifold and a second manifold communicating with the first connecting cover, and an outer edge disposed on the outer wall of the first manifold and the second manifold, wherein a plurality of through holes are provided on the outer edge.

[0025] By adopting the above technical solution, the exhaust manifold is designed as a one-piece cast manifold, which improves the flatness and sealing performance of the manifold, reduces the number of molds and welding processes, shortens the production cycle, and enhances the structural strength.

[0026] Optionally, the connecting pipe includes a second connecting cover, a bend connected to the second connecting cover at one end, a fixed flange disposed at the end of the bend away from the second connecting cover, and a fixed plate disposed on the outer wall of the second connecting cover, wherein the fixed plate has a through hole.

[0027] By adopting the above technical solution, a fixing plate and a fixing flange are set on the connecting pipe, which facilitates the stable installation of the three-way catalytic converter into the vehicle exhaust system, thereby improving the overall structural stability and installation convenience.

[0028] In summary, this application has the following technical effects:

[0029] 1. By setting up a housing, exhaust manifold, and connecting pipes, as well as a connection structure, quick disassembly and assembly between the exhaust manifold, housing, and connecting pipes are achieved, which facilitates the cleaning or replacement of the ceramic carrier inside the housing and avoids the inconvenience and low work efficiency caused by traditional welding methods.

[0030] 2. By setting up an installation tube, installation shell, sliding rod, compression spring, and locking block, the elastic force of the compression spring pushes the locking block to automatically engage with the locking pin's slot, realizing the self-locking function of the connection structure, ensuring the stability and reliability of the connection, and simplifying the operation steps;

[0031] 3. By setting a pin, a circular plate, and a fastening spring, a slot is set on the pin of the locking pin, and with the preload of the fastening spring, the fastening spring is in a compressed state when the block is inserted into the slot. This ensures the locking is secure and provides necessary cushioning, reducing rigid impact between components and extending service life. Attached Figure Description

[0032] Figure 1 This is a structural diagram of Example 1;

[0033] Figure 2 This is a structural diagram of Example 2;

[0034] Figure 3 This is an exploded structural diagram of Example 2;

[0035] Figure 4 This is an exploded view of the connecting structure;

[0036] Figure 5 It is a cross-sectional structural diagram of the connecting groove, mounting pipe and mounting shell.

[0037] Explanation of reference numerals in the attached drawings: 1. Housing; 2. Exhaust manifold; 21. First connecting cover; 22. First manifold; 23. Second manifold; 24. Outer edge; 3. Connecting fitting; 31. Second connecting cover; 32. Bend; 33. Fixed flange; 34. Fixed plate; 4. Connecting structure; 41. First flange; 42. Second flange; 43. Third flange; 44. Connecting groove; 441. Positioning protrusion; 45. Locking element; 451. Mounting pipe; 452. Mounting housing; 453. Pull rod; 454. Horizontal plate; 455. Compression spring; 456. Locking block; 46. Locking pin; 461. Pin rod; 4611. Slot; 462. Round plate; 463. Fastening spring. Detailed Implementation

[0038] The present application will be further described in detail below with reference to the accompanying drawings.

[0039] Example 1

[0040] This application discloses a three-way catalytic converter, referring to... Figure 1 The three-way catalytic converter includes a cylindrical housing 1 for equipping a ceramic carrier, and an exhaust manifold 2 and a connecting pipe 3 respectively disposed on the housing 1. One end of the exhaust manifold 2 is connected to the housing 1, and the end of the exhaust manifold 2 away from the housing 1 is connected to the engine cylinder, for concentrating the exhaust from each cylinder into the housing 1. The connecting pipe 3 is used to connect the exhaust pipe.

[0041] In this embodiment, the exhaust manifold 2 is an integrally formed cast manifold. Compared with a manifold made by stamping, the cast manifold can ensure better flatness, which is conducive to machining, effectively improves the sealing performance of the cast manifold, significantly reduces the number of molds to be developed and shortens the design cycle, and reduces welding, etc.

[0042] Reference Figure 1 In this embodiment, the exhaust manifold 2 includes a first connecting cap 21, a first manifold 22 and a second manifold 23, one end of which is connected to the first connecting cap 21, and an outer edge 24 located on the outer wall of the first manifold 22 and the second manifold 23 and forming a strip shape. The first connecting cap 21 is a round cap with an outer diameter consistent with the outer diameter of the housing 1. One end of the first manifold 22 and the second manifold 23 is flush with one side surface of the outer edge 24. A plurality of through holes are evenly provided on the outer edge 24.

[0043] Reference Figure 1 The connecting pipe fitting 3 includes a second connecting cover 31, a bent pipe 32 with one end fixed to the second connecting cover 31, a fixing flange 33 fixedly disposed on the end of the bent pipe 32 away from the second connecting cover 31, and a fixing plate 34 fixedly disposed on the outer wall of the second connecting cover 31. The second connecting cover 31 is a round cover with an outer diameter consistent with the outer diameter of the housing 1. The fixing plate 34 has a through hole.

[0044] Example 2

[0045] The difference between this embodiment and Embodiment 1 is that:

[0046] Reference Figure 2 The three-way catalytic converter also includes two sets of connection structures 4 for connecting the exhaust manifold 2 and the connecting pipe 3 to the two ends of the housing 1. When it is necessary to clean or replace the ceramic carrier inside the housing 1, the connection structure 4 facilitates the disassembly of the housing 1 and the exhaust manifold 2 or the housing 1 and the connecting pipe 3. After cleaning or replacement, the connection structure 4 also facilitates the stable assembly of the housing 1 and the exhaust manifold 2 or the housing 1 and the connecting pipe 3.

[0047] Reference Figure 3 The connecting structure 4 includes a flange, a connecting groove 44 for fastening the outside of the flange, a locking member 45 fixed to the outer wall of the connecting groove 44, and a locking pin 46 that can be inserted into and engaged with the locking member 45. The flange includes two first flanges 41 integrally formed on the outer walls of both ends of the housing 1, a second flange 42 integrally formed on the outer wall of the first connecting cover 21, and a third flange 43 integrally formed on the outer wall of the second connecting cover 31. The first flanges 41, second flanges 42, and third flanges 43 have the same thickness and outer diameter, and four through holes are respectively opened on the disc surface of the first flanges 41, second flanges 42, and third flanges 43. Each set of connecting structures 4 includes two semi-circular connecting grooves 44. Two sets of pin holes are opened on the groove walls of the connecting grooves 44 for the locking pin 46 to pass through and are respectively connected to the two through holes. Both the through holes and the pin holes are round holes with the same diameter. The width of the connecting groove 44 is twice the thickness of the first flange 41, and the depth of the connecting groove 44 is the same as the width of the flange face. The edge of the connecting groove 44 is processed to form a flared opening, so as to facilitate the connecting groove 44 to be fastened to the outside of the first flange 41 and the second flange 42 or the first flange 41 and the third flange 43.

[0048] Reference Figure 4 Positioning grooves with arc-shaped bottoms are machined on the arc-shaped outer walls of the first flange 41, the second flange 42, and the third flange 43, respectively. A positioning protrusion 441 is fixedly installed in the groove of the connecting groove 44. The shape of the positioning protrusion 441 is adapted to the groove of the positioning groove and can be inserted into the positioning groove. The thickness of the positioning protrusion 441 is greater than the thickness of the first flange 41. When the positioning protrusion 441 is inserted into the positioning groove, the through hole is connected to the pin hole, so that the locking pin 46 can be inserted into the locking member 45 after being inserted into the pin hole and the through hole respectively.

[0049] Reference Figure 5The locking component 45 includes an installation tube 451 with one end fixed to the outer wall of the connecting groove 44 and communicating with the pin hole; an installation shell 452 fixedly disposed on the outer wall of the installation tube 451 and spaced apart from the outer wall of the connecting groove 44; a pull rod 453 slidably inserted into the end of the installation shell 452 away from the installation tube 451; a horizontal plate 454 fixedly disposed on the end of the pull rod 453 away from the installation tube 451; a compression spring 455 sleeved on the pull rod 453 and located inside the installation shell 452; and a locking block 456 fixedly disposed on the end of the pull rod 453 away from the horizontal plate 454 and movably disposed inside the installation tube 451.

[0050] The mounting tube 451 is a round tube with the same inner diameter as the pin hole, and the openings are arranged coaxially. One end of the mounting shell 452 is open, fixed to the outer wall of the mounting tube 451 and connected to the interior of the mounting tube 451. The other end of the mounting shell 452 is closed, and the pull rod 453 passes through the closed end of the shell. The pull rod 453 is a rectangular rod with a rectangular end face. The closed end of the mounting shell 452 has a square hole that fits the end face of the pull rod 453 and allows the pull rod 453 to pass through, thus preventing the pull rod 453 from rotating. The length of the pull rod 453 is greater than the length of the shell. When the locking block 456 is inside the mounting tube 451, the cross plate 454 is spaced apart from the closed end of the mounting shell 452. The locking block 456 is a wedge-shaped block with a right-angled triangle on its side. One right-angled side of the locking block 456 is fixed to the lower end of the pull rod 453, and the inclined surface of the locking block 456 faces away from the mounting shell 452 and towards the outer wall of the connecting groove 44. The original length of the compression spring 455 is greater than the distance between the closed end of the mounting shell 452 and the inner wall of the mounting tube 451.

[0051] Reference Figure 4 The locking pin 46 includes a pin 461 made of a round rod, a circular plate 462 coaxially fixed to one end face of the pin 461, and a fastening spring 463 sleeved on the pin 461 and fixedly connected at one end to the circular plate 462. The outer diameter of the pin 461 is the same as the diameter of the pin hole. Multiple slots 4611 are equally spaced around the axis of the pin 461. The slots 4611 are adapted to the locking block 456, and the locking block 456 can be locked into the slots 4611. The length of the fastening spring 463 is less than the length of the pin 461. When the locking block 456 is locked into the slot 4611, the fastening spring 463 is compressed between the outer wall of the connecting groove 44 and the circular plate 462.

[0052] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A three-way catalytic converter, characterized in that: It includes a cylindrical shell (1), an exhaust manifold (2) and a connecting pipe (3) respectively disposed at both ends of the shell (1), and a connecting structure (4) for detachably connecting the exhaust manifold (2) and the connecting pipe (3) to the shell (1); The connection structure (4) includes two first flanges (41) integrally formed on both ends of the housing (1), a second flange (42) integrally formed on the exhaust manifold (2), a third flange (43) integrally formed on the connecting pipe (3), a connecting groove (44) for covering the fitted first flange (41) and second flange (42) and the first flange (41) and third flange (43), a locking member (45) provided on the outer wall of the connecting groove (44), and a locking pin (46) that can pass through the connecting groove (44) and be lockedly connected to the locking member (45) from the outer wall of the connecting groove (44) away from the locking member (45).

2. The three-way catalyst according to claim 1, characterized in that: The locking component (45) includes a mounting tube (451) fixed on the outer wall of the connecting groove (44), a mounting shell (452) with one end fixed to and connected to the outer wall of the mounting tube (451), a pull rod (453) slidably disposed in the mounting shell (452), a compression spring (455) sleeved on the pull rod (453) and located in the mounting shell (452), and a locking block (456) disposed at one end of the pull rod (453) and extendable into the mounting tube (451). When the locking block (456) can engage with the locking pin (46), the compression spring (455) is in a compressed state.

3. A three-way catalyst according to claim 2, characterized in that: The locking pin (46) includes a pin (461), a circular plate (462) disposed at one end of the pin (461), and a fastening spring (463) sleeved on the pin (461). A slot (4611) adapted to the locking block (456) is provided on the circumferential surface of the pin (461). When the locking block (456) is located in the slot (4611), the fastening spring (463) is in a compressed state.

4. A three-way catalytic converter according to claim 2, characterized in that: The end of the mounting shell (452) away from the mounting tube (451) is a closed end and has a square hole. The end face of the pull rod (453) is rectangular and fits the square hole. The side of the card block (456) away from the mounting shell (452) is machined with a bevel. The bevel faces away from the mounting shell (452) and towards the outer wall of the connecting groove (44).

5. A three-way catalytic converter according to claim 3, characterized in that: The pin (461) is a round rod, and multiple slots (4611) are spaced apart around the axis of the pin (461).

6. A three-way catalytic converter according to any one of claims 1-5, characterized in that: The connecting groove (44) is semi-circular, and the two connecting grooves (44) are fastened to the rear end face of the first flange (41) and fit together.

7. A three-way catalyst according to claim 6, characterized in that: The outer wall of the connecting groove (44) is provided with a pin hole through which the pin rod (461) passes, and the first flange (41), the second flange (42) and the third flange (43) are provided with through holes through which the pin rod (461) passes.

8. A three-way catalytic converter according to claim 7, characterized in that: The first flange (41), the second flange (42) and the third flange (43) are provided with positioning grooves. The inner wall of the groove of the connecting groove (44) is provided with a positioning protrusion (441) that is compatible with the positioning groove. After the positioning protrusion (441) is inserted into the positioning groove, the pin hole is connected to the through hole.

9. A three-way catalytic converter according to claim 1, characterized in that: The exhaust manifold (2) is an integrally formed cast manifold, including a first connecting cover (21), a first manifold (22) and a second manifold (23) communicating with the first connecting cover (21), and an outer edge (24) provided on the outer wall of the first manifold (22) and the second manifold (23), wherein a plurality of through holes are provided on the outer edge (24).

10. A three-way catalytic converter according to claim 1, characterized in that: The connecting pipe (3) includes a second connecting cover (31), a bend (32) connected to the second connecting cover (31) at one end, a fixed flange (33) disposed at the end of the bend (32) away from the second connecting cover (31), and a fixing plate (34) disposed on the outer wall of the second connecting cover (31), wherein the fixing plate (34) is provided with a through hole.

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