CN115306528A - Exhaust manifold intersegment sealing structure - Google Patents
Exhaust manifold intersegment sealing structure Download PDFInfo
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- CN115306528A CN115306528A CN202210945549.2A CN202210945549A CN115306528A CN 115306528 A CN115306528 A CN 115306528A CN 202210945549 A CN202210945549 A CN 202210945549A CN 115306528 A CN115306528 A CN 115306528A
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- exhaust manifold
- pipe section
- exhaust
- hole
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/08—Other arrangements or adaptations of exhaust conduits
- F01N13/10—Other arrangements or adaptations of exhaust conduits of exhaust manifolds
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/18—Construction facilitating manufacture, assembly, or disassembly
- F01N13/1805—Fixing exhaust manifolds, exhaust pipes or pipe sections to each other, to engine or to vehicle body
- F01N13/1827—Sealings specially adapted for exhaust systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F11/00—Arrangements of sealings in combustion engines
Abstract
The invention discloses an exhaust manifold intersegment sealing structure, wherein the rear end part of a front exhaust manifold and the front end part of a rear exhaust manifold are respectively and coaxially inserted into a front end exhaust hole and a rear end exhaust hole of a middle exhaust manifold, limiting surfaces for limiting the axial movement of the front exhaust manifold or the rear exhaust manifold are respectively arranged inside the front end and the rear end of the middle exhaust manifold, axial gaps exist between the rear end surface of the front exhaust manifold and the front end surface of the rear exhaust manifold and the limiting surfaces, radial gaps exist between the outer surface of the rear end part of the front exhaust manifold and the outer surface of the front end part of the rear exhaust manifold and the inner surface of the end part of the middle exhaust manifold, and an air leakage release channel is formed by the axial gaps and the radial gaps; the outer surface of the rear end part of the front exhaust manifold and the outer surface of the front end part of the rear exhaust manifold are connected with the inner surface of the end part of the middle exhaust manifold through sealing rings. When the manifold is slightly leaked, the pressure of leaked gas can be reduced, and high-temperature and high-pressure waste gas is prevented from directly rushing into the atmosphere.
Description
Technical Field
The invention relates to the technical field of vehicle engine equipment, in particular to an exhaust manifold inter-segment sealing structure.
Background
The exhaust manifolds of the diesel engines with six cylinders and more than six cylinders are generally segmented, the exhaust manifolds with different segments need to be sealed at the joints, and due to the fact that the temperature of the exhaust manifolds and the pressure ratio of gas inside the exhaust manifolds are high, gas leakage is easy to occur at the joints. Slight blow-by can blacken the cylinder head and surrounding accessories, etc., which can be quite unsatisfactory for the user to see. When the air leakage is serious, the power and the torque of the engine can be reduced, and the service performance of the engine is influenced.
The existing sealing structure of the sectional exhaust manifold mainly comprises the following parts:
1. the structure has reliable sealing performance, but has high requirement on the integral flatness of the cylinder cover and is suitable for the integral cylinder cover structure, the split cylinder cover is easy to leak gas at the joint of the cylinder cover and the exhaust manifold by using the structure, the requirement on the processing precision of the exhaust manifold is very high, and the sintering phenomenon is easy to occur at the joint in the using process;
2. the structure has low requirement on the coplanarity of the cylinder cover and low requirement on the processing precision of the exhaust manifold, but the structure has large compensation amount in the radial direction, is suitable for being used on a single cylinder cover, has poor sealing performance, and is easy to generate air leakage phenomenon because the sealing ring is not fully expanded in cold start;
3. the sealing structure with the corrugated pipe and the hoop is adopted, the sealing performance of the structure is good, the requirement on the machining precision of an exhaust manifold and a cylinder cover is not high, but the corrugated pipe is easy to generate intergranular corrosion fatigue cracks at high temperature so as to leak gas at the corrugated pipe, the cost is high, the strength of domestic corrugated pipe suppliers is not strong, and the reliability of manufactured products is low.
The patent with the application number of 201620895106.7 named as 'a sectional exhaust manifold sealing structure of an engine' discloses an exhaust manifold sealing structure, which comprises a first exhaust manifold and a second exhaust manifold, wherein one end of the second exhaust manifold is inserted into the first exhaust manifold to be connected with the first exhaust manifold. The joint end of the first exhaust manifold and the joint end of the second exhaust manifold are connected through a spigot, a first ring groove formed by steps is arranged at the joint of the spigot of the first exhaust manifold and the spigot of the second exhaust manifold, and a first sealing ring is arranged in the first ring groove. And a second ring groove is arranged on the outer surface of the insertion end inserted into the first exhaust manifold on the second exhaust manifold, and a second sealing ring is arranged in the second ring groove. The exhaust manifold sealing structure is provided with three sealing structures, wherein the first sealing structure is a spigot structure of a joint end of the first exhaust manifold and the second exhaust manifold, the second sealing structure is a first sealing ring arranged in the first annular groove, and the third sealing structure is a second sealing ring arranged in the second annular groove. The problem that the existing sectional exhaust manifold is poor in sealing performance and prone to air leakage is solved through the arrangement of the three sealing structures, meanwhile, the requirements on the machining precision of the cylinder cover and the exhaust manifold are not high, and the sectional exhaust manifold is applicable to both the integral cylinder cover and the split cylinder cover.
The patent with the application number of 201820609418.6 and the name of 'an exhaust manifold sealing structure' discloses an exhaust manifold sealing structure, which comprises a first exhaust manifold and a second exhaust manifold, wherein one end of the second exhaust manifold is inserted into the first exhaust manifold to be connected with the first exhaust manifold, the joint end of the first exhaust manifold and the joint end of the second exhaust manifold are connected through a spigot, a first ring groove formed by steps is arranged at the joint of the spigot of the first exhaust manifold and the spigot of the second exhaust manifold, a steel wire ring is arranged in the first ring groove and formed by weaving heat-resistant alloy materials, two sides of the woven steel wire ring have large areas and are high in heat resistance and good in elasticity, a first sealing ring is arranged between one end face of the steel wire ring and the first exhaust manifold, and a second sealing ring is arranged between the other end face of the steel wire ring and the second exhaust manifold. The inner wall of first exhaust manifold is equipped with first step portion and second step portion, the outer wall of second exhaust manifold is equipped with third step portion, form first annular between second step portion and third step portion, first sealing washer sets up between an terminal surface and the second step portion of steel wire winding, the second sealing washer sets up between another terminal surface and the third step portion of steel wire winding, because the inside and outside lateral surface area of steel wire winding is great, can hug closely first exhaust manifold and second exhaust manifold, when the steel wire winding is heated, the steel wire winding will expand, make the both ends face of steel wire winding hug closely first sealing washer and second sealing washer after the inflation, the inner wall of first exhaust manifold is hugged closely to the lateral surface of steel wire winding, the lateral surface of second exhaust manifold is hugged closely to the inner wall of steel wire winding, let whole seal structure performance strengthen. The first sealing ring and the second sealing ring are V-shaped sealing rings made of heat-resistant alloy steel belts, and two side faces of the sealing rings can be more tightly attached to the inner wall of the first exhaust manifold and the outer side face of the second exhaust manifold after the sealing rings expand, so that the sealing performance is enhanced.
As can be seen from the above analysis of the search patents, the sectional exhaust manifold generally adopts a sliding sleeve type (spigot) fitting, and two sealing rings are provided at the fitting structure to achieve sealing. However, the axial clearance of two sections of exhaust manifolds in the sliding sleeve type matching structure is very small, and the exhaust manifolds are easy to contact after being heated and expanded under the using working condition to generate larger internal stress, so that the sealing structure between the sections is easy to cause the exhaust manifolds to crack and lose efficacy, and further air leakage is caused; in addition, the sealing ring and the exhaust manifold in the above scheme are in interference fit, but the interference between the sealing ring and the exhaust manifold and the fit between the exhaust manifolds at two ends are not described; finally, each sealing structure in the scheme uses a heat-resistant alloy sealing ring, so that the cost is high.
Disclosure of Invention
The invention aims to solve the defects of the background technology and provide an exhaust manifold inter-segment sealing structure which has high reliability and low cost and can simultaneously meet the requirements of the exhaust manifold on thermal expansion and sealing performance.
In order to achieve the purpose, the invention designs an exhaust manifold segment sealing structure which comprises a segmented exhaust manifold, a front exhaust manifold, a middle exhaust manifold and a rear exhaust manifold, wherein the segmented exhaust manifold comprises a front exhaust manifold positioned at the front section of the exhaust direction, a middle exhaust manifold positioned at the middle section of the exhaust direction and a rear exhaust manifold positioned at the rear section of the exhaust direction; the method is characterized in that: the rear end part of the front exhaust manifold and the front end part of the rear exhaust manifold are coaxially inserted into a front end exhaust hole and a rear end exhaust hole of the middle exhaust manifold respectively, limiting surfaces for limiting the axial movement of the front exhaust manifold or the rear exhaust manifold are arranged in the front end and the rear end of the middle exhaust manifold, axial gaps exist between the rear end surface of the front exhaust manifold and the front end surface of the rear exhaust manifold and the limiting surfaces, radial gaps exist between the outer surface of the rear end part of the front exhaust manifold and the outer surface of the front end part of the rear exhaust manifold and the inner surface of the end part of the middle exhaust manifold, and the axial gaps and the radial gaps form a gas leakage release channel communicated with the inner exhaust channel of the middle exhaust manifold; and the outer surface of the rear end part of the front exhaust manifold and the outer surface of the front end part of the rear exhaust manifold are in sealing connection with the inner surface of the end part of the middle exhaust manifold through sealing rings.
Furthermore, the rear end part of the front exhaust manifold is a stepped pipe section which comprises a first front stepped pipe section positioned in front of the exhaust direction and a second front stepped pipe section positioned behind the exhaust direction, communicated with the first front stepped pipe Duan Tongzhou and smaller in outer diameter than the first front stepped pipe section; the front end exhaust hole of the middle exhaust manifold is a stepped hole matched with the rear end part of the front exhaust manifold, and comprises a first front stepped hole which is positioned in the front of the exhaust direction and is in clearance fit with the first front stepped pipe section and a second front stepped hole which is positioned in the rear of the exhaust direction and is in clearance fit with the second front stepped pipe section.
Further, the limiting surface comprises a first front step surface positioned at the joint of the first front step hole and the second front step hole and a second front step surface positioned at the joint of the second front step hole and the inner wall of the front end of the middle exhaust manifold; the axial gap comprises a first front axial gap between the rear end face of the first front step pipe section and the first front step face and a second front axial gap between the rear end face of the second front step pipe section and the second front step face.
Further, the radial gap includes a first front radial gap between the outer surface of the first front stepped pipe section and the hole wall of the first front stepped hole and a second front radial gap between the outer surface of the second front stepped pipe section and the hole wall of the second front stepped hole.
Further, be provided with coaxial coupling between the second front bench pipe section with the second front bench hole in the sealing washer on the second front bench pipe section, the sealing washer is the nickel base alloy steel band sealing washer that the cross section is the V type, the most advanced orientation of sealing washer the first front bench pipe section, opening one side orientation of sealing washer the first front bench face, the upper and lower both sides surface of sealing washer respectively with the pore wall in first front bench hole with the surface interference fit of second front bench pipe section.
Furthermore, the front end part of the rear exhaust manifold is a stepped pipe section which comprises a first rear stepped pipe section positioned at the rear part in the exhaust direction and a second rear stepped pipe section positioned at the front part in the exhaust direction, communicated with the first rear stepped pipe section Duan Tongzhou and smaller in outer diameter than the first rear stepped pipe section; the rear end exhaust hole of the middle exhaust manifold is a stepped hole matched with the rear end part of the rear exhaust manifold, and comprises a first rear stepped hole which is positioned at the rear part of the exhaust direction and is in clearance fit with the first rear stepped pipe section and a second rear stepped hole which is positioned at the front part of the exhaust direction and is in clearance fit with the second rear stepped pipe section.
Furthermore, the limiting surface comprises a first back step surface positioned at the joint of the first back step hole and the second back step hole and a second back step surface positioned at the joint of the second back step hole and the inner wall of the back end of the middle exhaust manifold; the axial gap comprises a first rear axial gap between the front end surface of the first background stage pipe section and the first background stage surface and a second rear axial gap between the front end surface of the second background stage pipe section and the second background stage surface.
Further, the radial clearance includes a first rear radial clearance between the outer surface of the first rear stepped pipe section and the hole wall of the first rear stepped hole and a second rear radial clearance between the outer surface of the second rear stepped pipe section and the hole wall of the second rear stepped hole.
Further, a seal ring coaxially connected to the second back-stage pipe section is arranged between the second back-stage pipe section and the second back-stage hole, the seal ring is a nickel-based alloy steel belt seal ring with a V-shaped cross section, the tip of the seal ring faces the first back-stage pipe section, one side of an opening of the seal ring faces a first back-stage surface, and the upper surface and the lower surface of the seal ring are in interference fit with the hole wall of the first back-stage hole and the outer surface of the second back-stage pipe section respectively.
Furthermore, a first diversion surface capable of guiding the exhaust from the front exhaust manifold to the middle exhaust manifold and a second diversion surface capable of guiding the exhaust in the middle exhaust manifold to the rear exhaust manifold are respectively arranged inside the front end and the rear end of the middle exhaust manifold.
The invention has the beneficial effects that: aiming at a sectional type exhaust manifold structure, the exhaust manifold at the middle section is taken as a base, two ends of the exhaust manifold are respectively matched with the exhaust manifold at the front section and the exhaust manifold at the rear section through a sliding sleeve type structure with two steps, a first step (one side close to the middle part of the exhaust manifold) is matched with a small clearance, and the clearance is about 0.1mm, so that a first sealing structure is formed, the pressure of leaked gas can be obviously reduced, and the impact of high-temperature gas on the rear structure is reduced; the second step (the side far away from the middle part of the middle exhaust manifold) is matched with a large clearance, about 0.5mm, and does not play a sealing role. The inner wall of the middle exhaust manifold close to the inter-segment matching position is provided with a flow channel guide structure, so that the flow of waste gas in the manifold is optimized, the flow channeling of gas to the inter-segment is reduced, and the possibility of gas leakage is reduced. An expansion buffer area is arranged between the step spigot position of the front exhaust manifold and the step hole of the middle exhaust manifold, an expansion buffer area is also arranged between the step spigot position of the rear exhaust manifold and the step hole of the middle exhaust manifold, and a matching structure formed by the first step and the second step forms a cavity. The cavity can prevent the exhaust manifold from expanding under each operating condition of the engine to cause hard contact of adjacent parts, thereby avoiding generating huge internal stress in the exhaust manifold and remarkably reducing the failure risk of cracking and air leakage of the exhaust manifold caused by unreasonable matching structure between the exhaust manifold sections. A V-shaped sealing ring is arranged in the cavity close to the middle exhaust manifold, the V-shaped sealing ring is in interference fit with the two ends of the exhaust manifold, and the interference magnitude is about 0.2mm; at low temperature, the gas leakage passageway can be blocked up completely to V type sealing washer, high temperature, V type sealing washer and exhaust manifold thermal expansion, V type sealing washer self has good elasticity, can ensure that seal structure does not receive destruction, and the opening side of V type sealing washer is towards high temperature high pressure waste gas, such structure makes the opening of V type sealing washer have the expansion pressure, the exhaust manifold of both sides can be hugged closely more to V type sealing washer, sealing performance is stronger, these two interference fit have formed the second seal structure, can effectively block up the inside high temperature high pressure waste gas of exhaust manifold, when slightly revealing appears, high temperature high pressure waste gas enters into the cavity through above-mentioned two seal structures, can make the pressure of gas leakage reduce rapidly, the atmosphere is steadily released into through the clearance of second step at last, can effectively avoid high temperature high pressure waste gas directly to rush into the atmosphere, it is smoked black, burn out the peripheral part of exhaust manifold. Meanwhile, the cavity can prevent the V-shaped sealing ring from being extruded and damaged due to hard contact with the front exhaust manifold and the rear exhaust manifold under each operating condition of the engine, and the effectiveness of the inter-section sealing structure is guaranteed.
Drawings
FIG. 1 is a front view of an exhaust manifold inter-segment seal arrangement of the present invention;
FIG. 2 is a front view of the rear end partial cross-section front exhaust manifold of the present invention;
FIG. 3 is a front end partially sectioned front view of a mid-exhaust manifold according to the present invention;
FIG. 4 is a front view of a rear end partial cross-section of a mid-exhaust manifold in accordance with the present invention;
FIG. 5 is a front end partially sectioned front view of an aft exhaust manifold in accordance with the present invention;
FIG. 6 is an axial cross-sectional view of a mating connection of a mid exhaust manifold to a forward exhaust manifold in accordance with the present invention;
FIG. 7 is an axial cross-sectional view of a mating connection of a mid exhaust manifold to an aft exhaust manifold in accordance with the present invention;
wherein, 1-front exhaust manifold (1.1-first front step pipe section, 1.2-second front step pipe section), 2-middle exhaust manifold (2.1-first front step hole, 2.2-second front step hole, 2.3-first back step hole, 2.4-second back step hole), 3-back exhaust manifold (3.1-first back step pipe section, 3.2-second back step pipe section), 4-seal ring, 5-first front step face, 6-second front step face, 7-first front axial gap, 8-second front axial gap, 9-first front radial gap, 10-second front radial gap, 11-first back step face, 12-second back step face, 13-first back axial gap, 14-second back axial gap, 15-first back radial gap, 16-second back radial gap, 17-first back flow guide face, 18-second back flow guide face, 19-front stop positioning.
Detailed Description
The invention is described in further detail below with reference to the figures and the specific embodiments. The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, are used in the orientations and positional relationships indicated in the drawings, which are based on the orientations and positional relationships indicated in the drawings, and are used for convenience of description and simplicity of description, but do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The exhaust manifold segment-to-segment sealing structure shown in fig. 1 includes a segmented exhaust manifold including a front exhaust manifold 1 located at the front section in the exhaust direction, a middle exhaust manifold 2 located at the middle section in the exhaust direction, and a rear exhaust manifold 3 located at the rear section in the exhaust direction; the rear end portion of the front exhaust manifold 1 and the front end portion of the rear exhaust manifold 3 are coaxially inserted into the front end exhaust hole and the rear end exhaust hole of the middle exhaust manifold 2, respectively.
As shown in fig. 2, 3 and 6, the rear end of the front exhaust manifold 1 is a stepped pipe section, which includes a first front stepped pipe section 1.1 located in front of the exhaust direction and a second front stepped pipe section 1.2 located behind the exhaust direction, coaxially communicated with the first front stepped pipe section 1.1 and having an outer diameter smaller than that of the first front stepped pipe section 1.1; the front end exhaust hole of the middle exhaust manifold 2 is a stepped hole matched with the rear end part of the front exhaust manifold 1, and comprises a first front stepped hole 2.1 which is positioned in the front of the exhaust direction and is in clearance fit with a first front stepped pipe section 1.1 and a second front stepped hole 2.2 which is positioned in the rear of the exhaust direction and is in clearance fit with a second front stepped pipe section 1.2.
Specifically, the front end of the middle exhaust manifold 2 is internally provided with a limiting surface for limiting the axial movement of the front exhaust manifold 1, and the limiting surface comprises a first front stepped surface 5 located at the joint of the first front stepped hole 2.1 and the second front stepped hole 2.2 and a second front stepped surface 6 located at the joint of the second front stepped hole 2.2 and the inner wall of the front end of the middle exhaust manifold 2. There is the axial clearance between the rear end face of preceding exhaust manifold 1 and the preceding terminal surface of back exhaust manifold 3 and the spacing face, and the axial clearance is including being located the first preceding axial clearance 7 between the rear end face of first preceding stage pipe section 1.1 and first preceding stage 5 and being located the second preceding axial clearance 8 between the rear end face of second preceding stage pipe section 1.2 and the second preceding stage 6. Radial clearances exist between the outer surface of the rear end part of the front exhaust manifold 1 and the outer surface of the front end part of the rear exhaust manifold 3 and the inner surface of the end part of the middle exhaust manifold 2, and comprise a first front radial clearance 9 between the outer surface of the first front step pipe section 1.1 and the hole wall of the first front step hole 2.1 and a second front radial clearance 10 between the outer surface of the second front step pipe section 1.2 and the hole wall of the second front step hole 2.2. The axial gap and the radial gap form a blowby gas release passage that communicates with the internal exhaust passage of the middle exhaust manifold 2. A sealing ring 4 coaxially connected to the second front step pipe section 1.2 is arranged between the second front step pipe section 1.2 and the second front step hole 2.2, the sealing ring 4 is a nickel-based alloy steel belt sealing ring with a V-shaped cross section, the tip of the sealing ring 4 faces the first front step pipe section 1.1, one side of an opening of the sealing ring 4 faces a first front step surface 5, and the upper side surface and the lower side surface of the sealing ring 4 are in interference fit with the hole wall of the first front step hole 2.1 and the outer surface of the second front step pipe section 1.2 respectively. The interior of the front end of the middle exhaust manifold 2 is provided with a first flow guide surface 17 which can guide exhaust gas from the front exhaust manifold 1 into the middle exhaust manifold 2.
As shown in fig. 4, 5 and 7, the front end of the rear exhaust manifold 3 is a stepped pipe section, which includes a first rear stepped pipe section 3.1 located behind the exhaust direction and a second rear stepped pipe section 3.2 located in front of the exhaust direction, coaxially communicated with the first rear stepped pipe section 3.1, and having an outer diameter smaller than that of the first rear stepped pipe section 3.1; the rear end exhaust hole of the middle exhaust manifold 2 is a stepped hole matched with the rear end part of the rear exhaust manifold 3, and comprises a first rear stepped hole 2.3 which is positioned at the rear part of the exhaust direction and is in clearance fit with the first rear stepped pipe section 3.1 and a second rear stepped hole 2.4 which is positioned at the front part of the exhaust direction and is in clearance fit with the second rear stepped pipe section 3.2.
Specifically, the inner portions of the rear ends of the middle exhaust manifolds 2 are respectively provided with a limiting surface for limiting the axial movement of the rear exhaust manifolds 3, and the limiting surfaces include a first rear stepped surface 11 located at the joint of the first rear stepped hole 2.3 and the second rear stepped hole 2.4 and a second rear stepped surface 12 located at the joint of the second rear stepped hole 2.4 and the inner wall of the rear end of the middle exhaust manifold 2. An axial gap exists between the front end face of the rear exhaust manifold 3 and the limiting face, and the axial gap includes a first rear axial gap 13 between the front end face of the first rear stage section 3.1 and the first rear stage face 11, and a second rear axial gap 14 between the front end face of the second rear stage section 3.2 and the second rear stage face 12. A radial clearance exists between the outer surface of the front end of the rear exhaust manifold 3 and the inner surface of the end of the middle exhaust manifold 2, the radial clearance comprising a first rear radial clearance 15 between the outer surface of the first rear step section 3.1 and the bore wall of the first rear step bore 2.3 and a second rear radial clearance 16 between the outer surface of the second rear step section 3.2 and the bore wall of the second rear step bore 2.4. The axial gap and the radial gap form a blowby gas release passage that communicates with the internal exhaust passage of the middle exhaust manifold 2. A sealing ring 4 coaxially connected to the second back stage pipe section 3.2 is arranged between the second back stage pipe section 3.2 and the second back stage hole 2.4, the sealing ring 4 is a nickel-based alloy steel belt sealing ring with a V-shaped cross section, the tip of the sealing ring 4 faces the first back stage pipe section 3.1, one side of an opening of the sealing ring 4 faces the first back stage surface 11, and the upper and lower side surfaces of the sealing ring 4 are in interference fit with the hole wall of the first back stage hole 2.3 and the outer surface of the second back stage pipe section 3.1 respectively. Second flow guide surfaces 18 capable of guiding exhaust gas in the middle exhaust manifold 2 to the rear exhaust manifold 3 are respectively arranged in the rear ends of the middle exhaust manifold 2.
In this scheme, preceding exhaust manifold 1's second preceding stage pipe section 1.2 cooperates with well exhaust manifold 2's second preceding stage hole 2.2, and this cooperation is clearance fit, and the clearance is about 0.1mm, forms first seal structure, and first seal structure can show to reduce the pressure of revealing gas, alleviates high-temperature gas to the impact of the seal structure that follows. The first stepped pipe section 1.1 of the front exhaust manifold 1 is fitted with the first front stepped hole 2.1 of the middle exhaust manifold 2, the fitting is a clearance fitting, the clearance is about 0.5mm, and the fitting does not play a sealing role. A cavity is formed between the second front step pipe section 1.2 and the inner hole wall of the front end of the middle exhaust manifold 2, a V-shaped sealing ring 4 is placed in the cavity close to the middle exhaust manifold 2, and the opening of the sealing ring 4 faces the middle exhaust manifold 2. The connecting and matching structure of the rear exhaust manifold 3 and the middle exhaust manifold 2 is the same as and symmetrical to the connecting and matching structure of the front exhaust manifold 1 and the middle exhaust manifold 2.
The V-shaped sealing rings 4 are made of nickel-based alloy steel strips and have strong elasticity, the two sealing rings 4 are in interference fit with the front exhaust manifold 1 and the rear exhaust manifold 3 respectively, and the interference magnitude is about 0.2mm. At low temperature, the sealing ring 4 can completely block the gas leakage channel; under the high temperature, sealing washer 4 and exhaust manifold are heated the inflation, and sealing washer 4 self good elasticity guarantee seal structure does not receive destruction, and sealing washer 4 receives one side that high temperature high pressure waste gas assaulted to exert expansion pressure to the opening of sealing washer 4, makes sealing washer 4 hug closely the exhaust manifold of both sides about more, and sealing performance is stronger. The two interference fits form a second seal. The second sealing structure has the strongest sealing effect and can effectively block high-temperature and high-pressure waste gas in the exhaust manifold.
When the exhaust manifold slightly reveals, high temperature high pressure waste gas enters into the cavity through above-mentioned twice seal structure, can make the pressure of leaking gas reduce rapidly, and the atmosphere is steadily released into through the clearance of first front step hole 2.1 and first front step tube section 1.1 at last, can effectively avoid high temperature high pressure waste gas directly to rush into the atmosphere, and the sootiness, burns out the peripheral part of exhaust manifold. In the air flue of the middle exhaust manifold 2, a flow guide surface is also arranged, and the structure aims to optimize the flow of the waste gas in the manifold, reduce the gas flowing to the sections and reduce the possibility of leakage. From the reliability perspective, sealing can be better performed only by ensuring the reliability of the exhaust manifold itself. For the inter-exhaust manifold segment fitting, it is necessary to ensure that the distance between the position where the front exhaust manifold 1 is inserted into the front positioning spigot 19 of the middle exhaust manifold 2 and the inner side surface of the second front stepped hole of the middle exhaust manifold 2 is kept to 5mm or more, forming an expansion buffering area. The expansion buffer area can enable the exhaust manifold not to expand under each operation condition of the engine to cause hard contact of adjacent parts, thereby avoiding huge internal stress generated inside the exhaust manifold and remarkably reducing the failure risk of cracking and air leakage of the exhaust manifold caused by unreasonable matching structure between the exhaust manifold sections. Correspondingly, the cavity can play a similar role, so that the sealing ring 4 is not hard contacted with the front exhaust manifold and the rear exhaust manifold to be extruded and damaged under each operating condition of the engine, and the effectiveness of the inter-segment sealing structure is guaranteed.
Finally, it should be noted that the above embodiments are merely representative examples of the present invention. It is obvious that the invention is not limited to the above-described embodiments, but that many variations are possible. Any simple modification, equivalent change and modification made to the above embodiments in accordance with the technical spirit of the present invention should be considered to be within the scope of the present invention. Here, it should be noted that the description of the above technical solutions is exemplary, the present specification may be embodied in different forms, and should not be construed as being limited to the technical solutions set forth herein. Rather, these descriptions are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. Furthermore, the technical solution of the present invention is limited only by the scope of the claims.
The shapes, sizes, ratios, angles, and numbers disclosed to describe aspects of the specification and claims are examples only, and thus, the specification and claims are not limited to the details shown. In the following description, when a detailed description of related known functions or configurations is determined to unnecessarily obscure the focus of the present specification and claims, the detailed description will be omitted. Where the terms "comprising", "having" and "including" are used in this specification, there may be another part or parts unless otherwise stated, and the terms used may generally be singular but may also refer to the plural.
The features of the various embodiments of the present invention may be partially or fully combined or spliced with each other and performed in a variety of different configurations as would be well understood by those skilled in the art. Embodiments of the present invention may be performed independently of each other or may be performed together in an interdependent relationship.
Claims (10)
1. An exhaust manifold intersegment sealing structure comprises a sectional type exhaust manifold, a front exhaust manifold (1) positioned at the front section of the exhaust direction, a middle exhaust manifold (2) positioned at the middle section of the exhaust direction and a rear exhaust manifold (3) positioned at the rear section of the exhaust direction; the method is characterized in that: the rear end part of the front exhaust manifold (1) and the front end part of the rear exhaust manifold (3) are coaxially inserted into a front end exhaust hole and a rear end exhaust hole of the middle exhaust manifold (2) respectively, limiting surfaces for limiting the axial movement of the front exhaust manifold (1) or the rear exhaust manifold (3) are arranged inside the front end and the rear end of the middle exhaust manifold (2), axial gaps exist between the rear end surface of the front exhaust manifold (1) and the front end surface of the rear exhaust manifold (3) and the limiting surfaces, radial gaps exist between the outer surface of the rear end part of the front exhaust manifold (1) and the outer surface of the front end part of the rear exhaust manifold (3) and the inner surface of the end part of the middle exhaust manifold (2), and the axial gaps and the radial gaps form a gas leakage release channel communicated with the inner exhaust channel of the middle exhaust manifold (2); the outer surface of the rear end part of the front exhaust manifold (1) and the outer surface of the front end part of the rear exhaust manifold (3) are hermetically connected with the inner surface of the end part of the middle exhaust manifold (2) through a sealing ring (4).
2. The exhaust manifold inter-segment sealing structure according to claim 1, characterized in that: the rear end part of the front exhaust manifold (1) is a stepped pipe section and comprises a first front stepped pipe section (1.1) located in front of the exhaust direction and a second front stepped pipe section (1.2) located behind the exhaust direction, coaxially communicated with the first front stepped pipe section (1.1) and smaller than the first front stepped pipe section (1.1) in outer diameter; the front end exhaust hole of the middle exhaust manifold (2) is a stepped hole matched with the rear end part of the front exhaust manifold (1), and comprises a first front stepped hole (2.1) which is located in the front of the exhaust direction and is in clearance fit with the first front stepped pipe section (1.1) and a second front stepped hole (2.2) which is located in the rear of the exhaust direction and is in clearance fit with the second front stepped pipe section (1.2).
3. The exhaust manifold inter-segment sealing structure according to claim 2, characterized in that: the limiting surface comprises a first front step surface (5) positioned at the joint of the first front step hole (2.1) and the second front step hole (2.2) and a second front step surface (6) positioned at the joint of the second front step hole (2.2) and the inner wall of the front end of the middle exhaust manifold (2); the axial gap comprises a first front axial gap (7) between the rear end face of the first front step pipe section (1.1) and the first front step surface (5) and a second front axial gap (8) between the rear end face of the second front step pipe section (1.2) and the second front step surface (6).
4. The exhaust manifold inter-segment sealing structure of claim 3, wherein: the radial gaps comprise a first forward radial gap (9) between the outer surface of the first forward step tube section (1.1) and the bore wall of the first forward step bore (2.1) and a second forward radial gap (10) between the outer surface of the second forward step tube section (1.2) and the bore wall of the second forward step bore (2.2).
5. The exhaust manifold inter-segment sealing structure according to claim 4, characterized in that: the utility model discloses a sealing device, including first preceding stage pipe section (1.2) and second preceding stage hole (2.2), be provided with coaxial coupling in between second preceding stage pipe section (1.2) sealing washer (4), sealing washer (4) are the nickel base alloy steel band sealing washer of cross section for the V type, the most advanced orientation of sealing washer (4) first preceding stage pipe section (1.1), the opening one side orientation of sealing washer (4) first preceding stage face (5), the upper and lower both sides surface of sealing washer (4) respectively with the pore wall of first preceding stage hole (2.1) with the surface interference fit of second preceding stage pipe section (1.2).
6. The exhaust manifold inter-segment sealing structure according to claim 1, characterized in that: the front end part of the rear exhaust manifold (3) is a stepped pipe section which comprises a first background stepped pipe section (3.1) positioned at the rear part of the exhaust direction and a second background stepped pipe section (3.2) positioned at the front part of the exhaust direction, coaxially communicated with the first background stepped pipe section (3.1) and smaller than the first background stepped pipe section (3.1) in outer diameter; the rear end exhaust hole of the middle exhaust manifold (2) is a stepped hole matched with the rear end part of the rear exhaust manifold (3), and comprises a first rear stepped hole (2.3) which is located behind the exhaust direction and is in clearance fit with the first rear stepped pipe section (3.1) and a second rear stepped hole (2.4) which is located in front of the exhaust direction and is in clearance fit with the second rear stepped pipe section (3.2).
7. The exhaust manifold inter-segment sealing structure according to claim 6, characterized in that: the limiting surface comprises a first back step surface (11) positioned at the joint of the first back step hole (2.3) and the second back step hole (2.4) and a second back step surface (12) positioned at the joint of the second back step hole (2.4) and the inner wall of the rear end of the middle exhaust manifold (2); the axial gap comprises a first rear axial gap (13) between the front end face of the first rear stage pipe section (3.1) and the first rear stage surface (11) and a second rear axial gap (14) between the front end face of the second rear stage pipe section (3.2) and the second rear stage surface (12).
8. The exhaust manifold inter-segment sealing structure according to claim 7, characterized in that: the radial gaps comprise a first rear radial gap (15) between the outer surface of the first rear stepped pipe section (3.1) and the bore wall of the first rear stepped bore (2.3) and a second rear radial gap (16) between the outer surface of the second rear stepped pipe section (3.2) and the bore wall of the second rear stepped bore (2.4).
9. The exhaust manifold inter-segment sealing structure according to claim 8, characterized in that: second backstage pipe section (3.2) with be provided with coaxial coupling between second backstage hole (2.4) in on second backstage pipe section (3.2) sealing washer (4), sealing washer (4) are the nickel base alloy steel band sealing washer of cross section for the V type, the pointed end orientation of sealing washer (4) first backstage pipe section (3.1), opening one side orientation first backstage face (11) of sealing washer (4), the upper and lower both sides surface of sealing washer (4) respectively with the pore wall of first backstage hole (2.3) with the surface interference fit of second backstage pipe section (3.1).
10. The exhaust manifold inter-segment sealing structure according to claim 1, characterized in that: and a first flow guide surface (17) capable of guiding exhaust from the front exhaust manifold (1) into the middle exhaust manifold (2) and a second flow guide surface (18) capable of guiding the exhaust in the middle exhaust manifold (2) into the rear exhaust manifold (3) are respectively arranged in the front end and the rear end of the middle exhaust manifold (2).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210945549.2A CN115306528A (en) | 2022-08-08 | 2022-08-08 | Exhaust manifold intersegment sealing structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210945549.2A CN115306528A (en) | 2022-08-08 | 2022-08-08 | Exhaust manifold intersegment sealing structure |
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| CN115306528A true CN115306528A (en) | 2022-11-08 |
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| CN202210945549.2A Pending CN115306528A (en) | 2022-08-08 | 2022-08-08 | Exhaust manifold intersegment sealing structure |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103437916A (en) * | 2013-08-30 | 2013-12-11 | 东风商用车有限公司 | Anti-tempering safety valve of engine |
| CN103511050A (en) * | 2013-09-23 | 2014-01-15 | 潍柴动力股份有限公司 | Engine and exhaust manifold thereof |
| CN205990953U (en) * | 2016-08-16 | 2017-03-01 | 潍柴动力股份有限公司 | A kind of exhaust manifold sealing structure |
| CN208153125U (en) * | 2018-04-26 | 2018-11-27 | 泉州联成机械有限公司 | A kind of exhaust manifold sealing structure |
-
2022
- 2022-08-08 CN CN202210945549.2A patent/CN115306528A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103437916A (en) * | 2013-08-30 | 2013-12-11 | 东风商用车有限公司 | Anti-tempering safety valve of engine |
| CN103511050A (en) * | 2013-09-23 | 2014-01-15 | 潍柴动力股份有限公司 | Engine and exhaust manifold thereof |
| CN205990953U (en) * | 2016-08-16 | 2017-03-01 | 潍柴动力股份有限公司 | A kind of exhaust manifold sealing structure |
| CN208153125U (en) * | 2018-04-26 | 2018-11-27 | 泉州联成机械有限公司 | A kind of exhaust manifold sealing structure |
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