Segmented sealing connection structure of exhaust pipe

Abstract

The utility model discloses a sealing connection structure of a sectional type exhaust pipe, which comprises a mounting joint arranged on an exhaust middle pipe section, a mounting interface arranged on an exhaust branch pipe section and a sealing sleeve, an external thread is arranged on the outer surface of the sealing sleeve, an internal thread is arranged on the inner surface of the mounting interface, an internal spigot is arranged at one end of the sealing sleeve, and an external thread is arranged at the other end of the sealing sleeve. The sealing sleeve and the installation connector are connected together through the external thread and the internal thread, and the outer portion of the inner spigot can abut against the interior of the installation connector. A mounting groove is formed in the outer wall of the mounting connector, a radial sealing ring is arranged in the mounting groove, an axial sealing ring is arranged between the interior of the female end and the end of the mounting connector, the mounting connector is inserted into the sealing sleeve, and the sealing sleeve generates extrusion force on the axial sealing ring and the radial sealing ring. Axial and radial pressure of the exhaust branch pipe and the exhaust middle pipe can be effectively buffered, and radial and axial gas sealing can be achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of engine exhaust, in particular to a sealing connection structure of a segmented exhaust pipe. Background Art

[0002] The exhaust pipe is an important part of the engine's intake and exhaust system. Exhaust pipes are often made of high-temperature resistant materials. There are integral and segmented exhaust pipes. For engines below four cylinders, integral casting exhaust is generally used; for engines above four cylinders, due to the difficulty of integral casting, more and more split exhaust pipes are used. Split exhaust pipes can effectively reduce the scrap rate and greatly improve the situation where the exhaust pipe is broken due to engine vibration.

[0003] The prior patent application number CN217152092U discloses a segmented exhaust pipe sealing structure, which adopts a combination of a braided ring and an elastic ring, and the braided ring is additionally filled with mineral powder and the elastic ring is coated on the surface, so that the structure has a sealing and high temperature resistance effect. However, the components of the above prior art need to rely on coatings and additional fillings of mineral powder to achieve sealing and high temperature resistance, and the manufacturing cost is high. In actual applications, the high-frequency vibration of the air pipe may cause the coating and the filling of mineral powder to fall off, resulting in vibration fracture and leakage. The hidden dangers need to be solved.

[0004] The information disclosed in the above background technology section is only to increase the understanding of the overall background of the utility model, and should not be regarded as admitting or suggesting in any form that the information constitutes the prior art known to ordinary technicians in this field. Utility Model Content

[0005] In view of the above-mentioned existing defects, the purpose of the utility model is to provide a sealing connection structure of a segmented exhaust pipe, which utilizes the physical property clearance fit and, through the arrangement of a copper alloy sealing sleeve and a high-temperature resistant sealing ring, can effectively buffer the axial and radial pressures of the exhaust branch pipe and the exhaust intermediate pipe, and can achieve radial and axial gas sealing.

[0006] The technical solution of the utility model is as follows:

[0007] A sealing connection structure of a segmented exhaust pipe, comprising an exhaust middle pipe section and an exhaust branch pipe section located at the end of the exhaust middle pipe section, wherein a mounting joint is arranged on the exhaust middle pipe section, and a mounting interface is arranged on the exhaust branch pipe section; further comprising a sealing sleeve, wherein an external thread is arranged on the outer surface of the sealing sleeve, an internal thread is arranged on the inner surface of the mounting interface, an inner stop is arranged at one end of the sealing sleeve, the sealing sleeve and the mounting interface are connected together by external thread and internal thread, and the outer side of the inner stop can abut against the inside of the mounting interface; an installation groove is arranged on the outer wall of the mounting joint, a radial sealing ring is arranged in the installation groove, an axial sealing ring is arranged between the inside of the inner stop and the end of the mounting joint, the mounting joint is inserted into the sealing sleeve, and the sealing sleeve generates extrusion force on the axial sealing ring and the radial sealing ring respectively.

[0008] Specifically, the number of the mounting grooves is at least two along the radial direction of the mounting joint.

[0009] Specifically, the sealing sleeve and the mounting joint are connected by a clearance fit.

[0010] Specifically, the sealing sleeve is a metal copper alloy part.

[0011] Specifically, the radial sealing ring and the axial sealing ring are composite parts of silicon-carbon and aluminum-oxygen compounds.

[0012] The utility model also discloses another sealing connection structure of a segmented exhaust pipe, comprising an exhaust middle pipe section and an exhaust branch pipe section located at the end of the exhaust middle pipe section, the exhaust middle pipe section is provided with a mounting joint, and the exhaust branch pipe section is provided with a mounting interface; it also comprises a sealing sleeve, the outer surface of the sealing sleeve is provided with an external thread, the inner surface of the mounting interface is provided with an internal thread, the sealing sleeve and the mounting interface are connected together by the external thread and the internal thread; a sealing ring is also provided at the bottom of the mounting interface, the mounting joint is inserted into the sealing sleeve, and the sealing sleeve generates an extrusion force on the sealing ring; a conical sealing portion is provided at the end of the sealing sleeve close to the bottom of the mounting interface, the inner surface of the mounting interface is also provided with an inner conical surface, and the end of the mounting joint is provided with an outer conical surface, and the conical sealing portion is combined with the inner conical surface and the outer conical surface.

[0013] Specifically, the sealing sleeve and the mounting joint are connected by a clearance fit.

[0014] Specifically, the sealing sleeve is a metal copper alloy part.

[0015] Specifically, the sealing ring is a composite component of silicon-carbon and aluminum-oxygen compounds.

[0016] Beneficial effects of the utility model:

[0017] The utility model utilizes physical property clearance fit, and through the arrangement of a copper alloy sealing sleeve and a high-temperature resistant sealing ring, the copper alloy sealing sleeve has axial and radial vibration buffering effects, thereby preventing the exhaust branch pipe and the exhaust intermediate pipe from being broken due to engine vibration. The sealing ring is resistant to high temperature and impact, has high fracture strength, can achieve radial and axial gas sealing, and prevents gas leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is an overall schematic diagram of the segmented exhaust pipe of the utility model.

[0019] Figure 2 The utility model is a structural schematic diagram of a sealing connection structure of a segmented exhaust pipe.

[0020] Figure 3 It is a structural schematic diagram of another sealing connection structure of a segmented exhaust pipe of the utility model.

[0021] In the figure: 1-exhaust intermediate pipe section; 2-exhaust branch pipe section; 3-installation interface; 4-installation joint; 5 / 5'-sealing sleeve; 6-inner stop; 7-installation groove; 8-radial sealing ring; 9-axial sealing ring; 10-sealing ring; 11-conical sealing part; 12-inner conical surface; 13-outer conical surface; 14-flange opening; 15-main exhaust port. DETAILED DESCRIPTION

[0022] In order to explain the technical content, purpose and effect of the utility model in detail, the following is a description in combination with the embodiments and the accompanying drawings. In the description of the embodiments, it should be understood that the terms indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, which are only for the convenience of describing the embodiments and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0023] Example 1

[0024] According to a sealing connection structure of a segmented exhaust pipe according to a specific implementation method of this scheme, refer to Figure 1 , 2 As shown, it mainly includes an exhaust intermediate pipe section 1, an exhaust branch pipe section 2, a sealing sleeve 5, a radial sealing ring 8, and an axial sealing ring 9. Figure 1 As shown, two exhaust branch pipe sections 2 are installed at both ends of the exhaust intermediate pipe section 1. The exhaust intermediate pipe section 1 and the exhaust branch pipe section 2 are both provided with flange openings 14 of the same structure for connecting with the exhaust port of the engine cylinder head. The exhaust intermediate pipe section 1 is also provided with a main exhaust port 15 for connecting with a muffler or a post-treatment system to discharge the exhaust gas generated by the engine.

[0025] In this embodiment, the specific connection method of the exhaust branch pipe section 2 and the exhaust intermediate pipe section 1 is:

[0026] An installation joint 4 is provided on the exhaust intermediate pipe section 1, and an installation interface 3 is provided on the exhaust branch pipe section 2. An external thread is provided on the outer surface of the sealing sleeve 5, and an internal thread is provided on the inner surface of the installation interface 3. An internal stop 6 is provided at one end of the sealing sleeve 5. The sealing sleeve 5 and the installation interface 3 are connected together by external threads and internal threads, and the outer side of the internal stop 6 can abut against the inside of the installation interface 3; an installation groove 7 is provided on the outer wall of the installation joint 4, and a radial sealing ring 8 is provided in the installation groove 7, and an axial sealing ring 9 is provided between the inside of the internal stop 6 and the end of the installation joint 4. The installation joint 4 is inserted into the sealing sleeve 5, and the sealing sleeve 5 generates extrusion pressure on the axial sealing ring 9 and the radial sealing ring 8 respectively.

[0027] In this embodiment, the sealing sleeve 5 and the mounting joint 4 are connected by a clearance fit, so a partition seal is formed between the sealing sleeve 5 and the mounting joint 4 by the radial sealing ring 8 .

[0028] In order to increase radial sealing and installation damping, at least two installation grooves 7 are provided along the radial direction of the installation joint 4 , and the number of installation grooves 7 can also be set according to different requirements for the number of radial sealing rings 8 .

[0029] As the preferred technical solution of this embodiment, the sealing sleeve 5 is a metal copper alloy. The radial sealing ring 8 and the axial sealing ring 9 are silicon-carbon and aluminum oxide composite parts. The sealing sleeve 5 is made of metal copper alloy, which has high melting point, high boiling point, good ductility and good vibration buffering. The sealing ring is made of silicon-carbon compound, aluminum oxide compound and other materials, which are resistant to high temperature, soft and impact-resistant. It can be used for a long time at a high temperature above 850°C and has a large fracture strength. This sealing structure can remove the installation stress of the exhaust intermediate pipe section 1 and the exhaust branch pipe section 2 during installation; at the same time, the copper alloy sealing sleeve 5 at the installation seal of the exhaust branch pipe section 2 and the exhaust intermediate pipe section 1 has axial and radial vibration buffering effects to prevent the exhaust branch pipe section 2 and the exhaust intermediate pipe section 1 from breaking due to engine vibration; at the same time, there are two or more radial high temperature resistant, impact resistant and high fracture strength radial sealing rings 8 at the installation seal of the exhaust branch pipe section 2 and the exhaust intermediate pipe section 1, and there is an axial sealing ring 9 at the tail of the sealing sleeve 5 to prevent gas leakage.

[0030] During installation, tighten the copper alloy sealing sleeve 5 through the thread, and put the axial sealing ring 9 into the inner stop 6 at the bottom of the gold sealing sleeve 5 on the installation interface 3 of the exhaust branch pipe section 2, and put the radial sealing rings 8 into the installation grooves 7 opened at the installation interface 3 of the exhaust intermediate pipe section 1; the sealing sleeve 5 and the exhaust intermediate pipe section 1 are clearance-fitted, and then the exhaust branch pipe section 2 is installed into the exhaust intermediate pipe section 1, and finally the exhaust branch pipe section 2 and the exhaust intermediate pipe section 1 are installed to the exhaust port of the engine cylinder head through the installation flange opening 14.

[0031] Example 2

[0032] This embodiment provides another sealing connection structure of a segmented exhaust pipe with the same utility model concept as that of the first embodiment. Figure 3 As shown, it also includes an exhaust middle pipe section 1, an exhaust branch pipe section 2 located at the end of the exhaust middle pipe section 1, and a sealing sleeve 5', wherein the exhaust middle pipe section 1 is provided with a mounting joint 4, and the exhaust branch pipe section 2 is provided with a mounting interface 3.

[0033] In this embodiment, the specific connection method of the exhaust branch pipe section 2 and the exhaust intermediate pipe section 1 is:

[0034] An external thread is provided on the outer surface of the sealing sleeve 5', and an internal thread is provided on the inner surface of the mounting interface 3. The sealing sleeve 5' and the mounting interface 3 are connected together through the external thread and the internal thread; a sealing ring 10 is also provided at the bottom of the mounting interface 3, and the mounting joint 4 is inserted into the sealing sleeve 5', so that the sealing sleeve 5' generates an extrusion force on the sealing ring 10; a conical sealing portion 11 is provided at the end of the sealing sleeve 5' close to the bottom of the mounting interface 3, an inner conical surface 12 is also provided on the inner surface of the mounting interface 3, and an outer conical surface 13 is provided at the end of the mounting joint 4, and the conical sealing portion 11 is combined with the inner conical surface 12 and the outer conical surface 13.

[0035] In this embodiment, the materials of the sealing sleeve 5 ′ and the sealing ring 10 are consistent with those of the sealing sleeve 5 , the axial sealing ring 9 , and the radial sealing ring 8 in the first embodiment.

[0036] The sealing sleeve 5' and the mounting joint 4 of the exhaust intermediate pipe section 1 are matched with a small gap, and the exhaust branch pipe section 2 is installed into the exhaust intermediate pipe section 1, so that the outer conical sealing portion 11 of the sealing sleeve 5' is combined with the inner conical surface 12 on the inner side of the mounting interface 3 of the exhaust branch pipe section 2 to perform a sealing effect; the inner conical sealing portion 11 of the sealing sleeve 5' is combined with the outer conical surface 13 at the end of the mounting joint 4 of the exhaust intermediate pipe section 1 to perform a sealing effect; finally, the exhaust branch pipe section 2 and the exhaust intermediate pipe section 1 are installed to the exhaust port of the engine cylinder head through the mounting flange opening 14. At this time, the inner and outer conical sealing portions 11 of the sealing sleeve 5' are subjected to a certain amount of pressure in the axial and radial directions. When the engine vibrates during operation, the axial and radial pressures of the exhaust branch pipe section 2 and the exhaust intermediate pipe section 1 can be effectively buffered; at the same time, the sealing ring 10 is resistant to high temperature and impact, has high breaking strength, and can achieve radial and axial gas sealing.

[0037] Although the present invention has been described in detail above with specific implementation methods, it is obvious to those skilled in the art that some modifications or improvements can be made to the present invention. Therefore, these modifications or improvements made without departing from the spirit of the present invention are within the scope of protection claimed by the present invention.

Claims

1. A sealed connection structure of a segmented exhaust pipe, comprising an exhaust intermediate pipe section (1) and an exhaust branch pipe section (2) located at the end of the exhaust intermediate pipe section (1), the exhaust intermediate pipe section (1) being provided with a mounting joint (4), and the exhaust branch pipe section (2) being provided with a mounting interface (3), characterized in that: It also comprises a sealing sleeve (5), the outer surface of the sealing sleeve (5) is provided with an external thread, the inner surface of the mounting interface (3) is provided with an internal thread, one end of the sealing sleeve (5) is provided with an internal stopper (6), the sealing sleeve (5) and the mounting interface (3) are connected together via the external thread and the internal thread, and the outer portion of the internal stopper (6) can abut against the inside of the mounting interface (3); The outer wall of the mounting joint (4) is provided with a mounting groove (7), a radial sealing ring (8) is provided in the mounting groove (7), an axial sealing ring (9) is provided between the inside of the inner stop (6) and the end of the mounting joint (4), the mounting joint (4) is inserted into the sealing sleeve (5), and the sealing sleeve (5) generates extrusion pressure on the axial sealing ring (9) and the radial sealing ring (8) respectively.

2. A sealing connection structure of a segmented exhaust pipe according to claim 1, characterized in that: At least two mounting grooves (7) are arranged along the radial direction of the mounting joint (4).

3. The sealing connection structure of a segmented exhaust pipe according to claim 1, characterized in that: The sealing sleeve (5) and the mounting joint (4) are connected by a clearance fit.

4. The sealing connection structure of a segmented exhaust pipe according to claim 1, characterized in that: The sealing sleeve (5) is a metal copper alloy part.

5. A sealed connection structure of a segmented exhaust pipe, comprising an exhaust intermediate pipe section (1) and an exhaust branch pipe section (2) located at the end of the exhaust intermediate pipe section (1), the exhaust intermediate pipe section (1) being provided with a mounting joint (4), and the exhaust branch pipe section (2) being provided with a mounting interface (3), characterized in that: It also comprises a sealing sleeve (5'), the outer surface of the sealing sleeve (5') is provided with an external thread, the inner surface of the mounting interface (3) is provided with an internal thread, and the sealing sleeve (5') and the mounting interface (3) are connected together via the external thread and the internal thread; A sealing ring (10) is also provided at the bottom of the mounting interface (3), and the mounting joint (4) is inserted into the sealing sleeve (5'), so that the sealing sleeve (5') generates a squeezing force on the sealing ring (10); A conical sealing portion (11) is provided at the end of the sealing sleeve (5') near the bottom of the mounting interface (3), an inner conical surface (12) is also provided on the inner surface of the mounting interface (3), and an outer conical surface (13) is provided at the end of the mounting joint (4), wherein the conical sealing portion (11) is combined with the inner conical surface (12) and the outer conical surface (13).

6. The sealing connection structure of a segmented exhaust pipe according to claim 5, characterized in that: The sealing sleeve (5') and the mounting joint (4) are connected by a clearance fit.

7. The sealing connection structure of a segmented exhaust pipe according to claim 5, characterized in that: The sealing sleeve (5') is a metal copper alloy part.

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