CN117404167A

CN117404167A - Exhaust manifold sealing structure and exhaust manifold with same

Info

Publication number: CN117404167A
Application number: CN202311391296.XA
Authority: CN
Inventors: 周洪阳; 吴世友; 牛放; 时敬龙
Original assignee: FAW Jiefang Automotive Co Ltd
Current assignee: FAW Jiefang Automotive Co Ltd
Priority date: 2023-10-25
Filing date: 2023-10-25
Publication date: 2024-01-16

Abstract

The present application relates to an exhaust manifold sealing structure and an exhaust manifold having the same. The exhaust manifold sealing structure comprises a sealing flange, a sealing ring, a heat-resistant ring and an expansion-suppressing ring, wherein the sealing flange is connected to the end face of a pipe orifice of an exhaust manifold and is provided with a flange boss, the upper end face of the sealing ring is abutted to an engine cylinder head, the lower end face of the sealing ring is abutted to the top face of the flange boss, the outer side face of the heat-resistant ring is matched and installed on the inner side face of the flange boss, and the inner side face of the expansion-suppressing ring is matched and installed on the outer side face of the flange boss. The heat-resistant ring prevents the sealing flange and the sealing ring from being directly eroded by high-temperature exhaust, and the heat-resistant ring and the expansion-suppressing ring are matched with each other from the inner side surface of the flange boss and the outer side surface of the flange boss respectively, so that the transverse sliding deformation of the sealing flange is suppressed. The exhaust manifold sealing structure does not need to change the cylinder head structure of the engine, and only needs to arrange a heat-resistant ring and an expansion-suppressing ring on the sealing flange of the original exhaust manifold, and the sealing ring can still use common materials to ensure that the exhaust manifold sealing structure has good sealing performance under the high-temperature exhaust condition.

Description

Exhaust manifold sealing structure and exhaust manifold with same

Technical Field

The present disclosure relates to sealing structures between an automobile engine and an exhaust manifold, and more particularly to an exhaust manifold sealing structure and an exhaust manifold having the sealing structure.

Background

With the development of engine technology, the oil consumption and the exhaust gas amount of an engine are continuously reduced to meet the requirements of emission regulations, however, the oil consumption and the exhaust gas amount of the engine are reduced to cause the exhaust gas temperature of the engine to be higher and higher, the exhaust gas temperature is increased to cause the deformation of a sealing flange of an exhaust manifold to be increased, the sealing performance of a sealing gasket at high temperature is reduced, the sealing structure between the exhaust manifold and a cylinder cover of the engine is lost, and the air leakage is caused to influence the running of a vehicle. The traditional solution is to improve the high temperature resistance and deformation resistance of the exhaust manifold flange and the sealing gasket, and use expensive nickel-containing high temperature resistant cast iron materials to reduce the deformation degree of the exhaust manifold flange at high temperature and still maintain the elasticity of the sealing rib of the sealing gasket at high temperature. However, the conventional solution increases the cost of the engine, is not beneficial to mass production and use, and requires to integrally replace the exhaust manifold sealing structure made of the new material, which is not effective for the exhaust manifold sealing structure made of the old material.

Patent literature (CN 109281745 a) discloses a heat-insulating and energy-collecting sleeve structure between an exhaust manifold and a cylinder cover, wherein the heat-insulating and energy-collecting sleeve is arranged in an exhaust passage of the cylinder cover in a threaded manner and is arranged between high-temperature fuel gas and an exhaust manifold gasket, so that the working temperature of the exhaust manifold gasket is reduced, and the exhaust manifold gasket is prevented from directly receiving high-temperature exhaust erosion; however, a gap is reserved between the heat-insulating energy-collecting sleeve and the cylinder cover, and high-temperature gas contacts the exhaust manifold gasket through the gap, so that the heat-insulating effect of the heat-insulating energy-collecting sleeve on the exhaust manifold gasket is affected.

Patent literature (CN 208153180U) discloses a sealing structure between a cylinder head and an exhaust manifold of an engine, wherein the exhaust manifold and a flange of the cylinder head are simultaneously provided with a U-shaped groove for installing a flexible ring, and the sealing is performed through the pressure between the flexible ring and the U-shaped groove, however, the sealing structure is only suitable for conventional temperature, the flexible ring and the U-shaped groove are directly eroded by high-temperature exhaust under the condition of high-temperature exhaust, the material performance is rapidly reduced, and the sealing effect is poor.

Patent literature (CN 210234652U) discloses an exhaust manifold reinforcing structure that prevents deformation at high temperature by providing a tensioning plate, which can alleviate the degree of thermal deformation of an exhaust manifold flange, but aggravates internal stress of the exhaust manifold, which easily causes cracking of the exhaust manifold, and the exhaust manifold gasket is still directly subjected to high-temperature exhaust erosion, and sealing is easy to fail at high temperature.

Disclosure of Invention

Based on this, it is necessary to provide an exhaust manifold sealing structure and an exhaust manifold having the same, which are directed to the problem that the exhaust manifold sealing structure is easily deformed under high-temperature exhaust conditions to cause seal failure.

An exhaust manifold sealing structure for sealing connection between a nozzle end face of an exhaust manifold and a head end face of an engine cylinder head, the exhaust manifold sealing structure comprising:

the sealing flange is connected to the end face of the pipe orifice of the exhaust manifold, and a flange boss is arranged on the flange face, facing away from the exhaust manifold, of the sealing flange;

the upper end face of the sealing ring is abutted against the end face of a cover opening of the cylinder head of the engine, and the lower end face of the sealing ring is abutted against the top face of the flange boss;

the outer side surface of the heat-resistant ring is matched and installed on the inner side surface of the flange boss;

the inner side surface of the expansion inhibiting ring is matched and installed on the outer side surface of the flange boss.

In one embodiment, the height of the inner side surface of the flange boss is equal to the height of the outer side surface of the flange boss, and the inner side surface of the flange boss and the outer side surface of the flange boss are perpendicular to the top surface of the flange boss; the height of the outer side surface of the heat-resistant ring is larger than that of the inner side surface of the flange boss, and the height of the outer side surface of the heat-resistant ring is smaller than the sum of the height of the inner side surface of the flange boss and the height of the sealing ring.

In one embodiment, the height of the inner side surface of the expansion suppressing ring is greater than the height of the outer side surface of the flange boss, and the height of the inner side surface of the expansion suppressing ring is less than the height of the outer side surface of the heat resisting ring.

In one embodiment, the shortest distance between the tangent line of the outer side surface of the sealing ring and the tangent line of the inner side surface of the sealing ring is the width of the sealing ring, the shortest distance between the tangent line of the outer side surface of the flange boss and the tangent line of the inner side surface of the flange boss is the width of the top surface of the flange boss, and the width of the sealing ring is smaller than the width of the top surface of the flange boss; the outer side surface of the heat-resistant ring is not abutted to the inner side surface of the sealing ring, and the inner side surface of the expansion-suppressing ring is abutted to the outer side surface of the sealing ring.

In one embodiment, the inner diameter of the heat blocking ring is greater than the diameter of the exhaust manifold inner cavity cross section.

In one embodiment, the sealing ring comprises at least two layers of sealing gaskets which are arranged in a stacked manner, wherein the sealing gaskets are formed with sealing ribs, and the sealing ribs are flanges punched on the body of the sealing gaskets.

In one embodiment, a first mounting groove is formed in the inner side surface of the flange boss, and the outer side surface of the heat-resistant ring is in interference fit with the inner side surface of the flange boss through the first mounting groove; and/or the outer side surface of the flange boss is provided with a second mounting groove, and the inner side surface of the expansion inhibiting ring is in interference fit with the outer side surface of the flange boss through the second mounting groove.

In one embodiment, the exhaust manifold sealing structure further comprises a fastener that fixedly compresses the exhaust manifold sealing structure between a nozzle end face of the exhaust manifold and a head end face of the engine cylinder head.

In one embodiment, at least one of the following is also included:

the heat-resistant ring is made of a high-temperature alloy material;

the expansion-inhibiting ring is made of kovar alloy material.

The application also proposes an exhaust manifold with a sealing structure, comprising:

an exhaust manifold; the method comprises the steps of,

the exhaust manifold sealing structure.

In the technical scheme of the application, exhaust manifold seal structure sets up between exhaust manifold's mouth of pipe terminal surface and engine cylinder head's lid mouth terminal surface, and high temperature exhaust is discharged from engine cylinder head's lid mouth terminal surface and is got into exhaust manifold through exhaust manifold's mouth terminal surface, therefore high temperature exhaust can erode exhaust manifold seal structure's sealing flange and sealing ring. When high-temperature exhaust gas enters the exhaust manifold, the heat-resistant ring is firstly contacted, the heat conductivity coefficient of the heat-resistant ring is low, the sealing flange and the sealing ring are prevented from being directly eroded by the high-temperature exhaust gas, the elastic attenuation of the sealing ring in a high-temperature environment is reduced, the sealing elasticity of the sealing ring can be effectively maintained, the temperature of the flange surface of the sealing flange is also reduced by the heat-resistant ring, the longitudinal thermal deformation degree of the sealing flange is reduced, and the exhaust leakage caused by insufficient compensation quantity of the sealing ring due to overlarge deformation quantity at high temperature is prevented. The heat-resistant ring and the expansion-suppressing ring are matched with each other from the inner side surface of the flange boss and the outer side surface of the flange boss respectively, so that the transverse sliding deformation of the sealing flange is restrained, the friction damage effect of micro-movement of the sealing flange on the sealing rib of the sealing ring is reduced, and the sealing structure of the exhaust manifold is ensured to always have enough sealing pressure and reliable sealing performance under the high-temperature exhaust working condition.

The exhaust manifold sealing structure does not need to change the cylinder head structure of the engine, and only needs to arrange a heat-resistant ring and an expansion-suppressing ring on the sealing flange of the original exhaust manifold, and the sealing ring can still use common materials to ensure that the exhaust manifold sealing structure still has good sealing performance under the high-temperature exhaust condition.

Drawings

FIG. 1 is a schematic view of an exploded view of an embodiment of an exhaust manifold seal and an exhaust manifold having the seal.

FIG. 2 is a schematic cross-sectional view of an embodiment of an exhaust manifold seal and an exhaust manifold having the seal.

Fig. 3 is a schematic view of a partial enlarged structure at a in fig. 2.

FIG. 4 is a schematic cross-sectional view of the seal ring of FIG. 3 in the form of a C-ring.

Fig. 5 is a schematic diagram of the combined structure of top view (a), side view (b) and cross-sectional view (c) of an expansion-suppressing ring of an embodiment of an exhaust manifold having the sealing structure of the present application.

FIG. 6 is a schematic diagram of the combined structure of an isometric view (d) and a top view (e) of an exhaust manifold seal structure and a seal ring of an embodiment of an exhaust manifold having the seal structure of the present application.

FIG. 7 is a schematic cross-sectional view of a heat blocking ring of an embodiment of an exhaust manifold seal and an exhaust manifold having the seal of the present application.

FIG. 8 is a schematic diagram of the combined structure of cross-sectional view (f) and top view (g) of an exhaust manifold seal structure and a seal flange of an embodiment of an exhaust manifold having the seal structure of the present application.

Component reference numerals in the drawings illustrate:

1000. an exhaust manifold sealing structure; 100. a sealing flange; 110. a flange boss; 111. the top surface of the flange boss; 112. the inner side surface of the flange boss; 113. the outer side surface of the flange boss; 200. a seal ring; 210. a sealing gasket; 211. a seal ring inner side; 212. the outer side surface of the sealing ring; 300. a heat-resistant ring; 300a, C-shaped heat-resistant ring; 310. a heat-resistant ring inner side; 320. the outer side surface of the heat-resistant ring; 400. expansion-suppressing ring; 410. an expansion suppressing ring inner side surface; 420. the outer side surface of the expansion inhibiting ring; 500. a fastener; 600. an exhaust manifold; 610. an exhaust manifold inner cavity section; 700. an engine cylinder head; 2000. an exhaust manifold having a sealing structure.

Detailed Description

In order to make the above objects, features and advantages of the present application more comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is, however, susceptible of embodiment in many other forms than those described herein and similar modifications can be made by those skilled in the art without departing from the spirit of the application, and therefore the application is not to be limited to the specific embodiments disclosed below.

In the description of the present application, it should be understood that, if there are terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., these terms refer to the orientation or positional relationship based on the drawings, which are merely for convenience of description and simplification of description, and do not indicate or imply that the apparatus or element referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.

Furthermore, the terms "first," "second," and the like, if any, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the terms "plurality" and "a plurality" if any, mean at least two, such as two, three, etc., unless specifically defined otherwise.

In this application, unless explicitly stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly. For example, the two parts can be fixedly connected, detachably connected or integrated; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

In this application, unless expressly stated or limited otherwise, the meaning of a first feature being "on" or "off" a second feature, and the like, is that the first and second features are either in direct contact or in indirect contact through an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that if an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. If an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein, if any, are for descriptive purposes only and do not represent a unique embodiment.

Referring to fig. 1-4, fig. 1 and 2 show an exploded and cross-sectional schematic view of an embodiment of an exhaust manifold seal 1000 and an exhaust manifold 2000 having a seal according to the present application, respectively. Fig. 3 shows a partially enlarged schematic structural view at a in fig. 2. Fig. 4 shows a schematic cross-sectional structure of the heat-blocking ring 300 of fig. 3, which is a C-shaped heat-blocking ring 300 a. The application proposes an exhaust manifold sealing structure 1000 for sealing connection between a nozzle end face of an exhaust manifold 600 and a head end face of an engine cylinder head 700, the exhaust manifold sealing structure 1000 including a sealing flange 100, a sealing ring 200, a heat-blocking ring 300 and an expansion-suppressing ring 400. The sealing flange 100 is connected to the nozzle end surface of the exhaust manifold 600, and a flange boss 110 is provided on the flange surface of the sealing flange 100 facing away from the exhaust manifold 600.

Referring to fig. 5 to 8, fig. 5 is a schematic diagram showing a combined structure of a top view (a), a side view (b) and a cross-sectional view (c) of an exhaust manifold sealing structure 1000 and an expansion suppressing ring 400 of an embodiment of an exhaust manifold 2000 having the sealing structure according to the present application, and fig. 6 is a schematic diagram showing a combined structure of an isometric view (d) and a top view (e) of a seal ring 200. Fig. 7 shows a schematic cross-sectional structure of the heat-blocking ring 300. Fig. 8 shows a schematic view of the combined structure of the cross section (f) and the top view (g) of the sealing flange 100. The upper end surface of the seal ring 200 abuts against the head end surface of the engine cylinder head 700, and the lower end surface of the seal ring 200 abuts against the flange boss top surface 111. The heat-blocking ring outer side 320 is cooperatively mounted to the flange boss inner side 112. The inner side 410 of the expansion-suppressing ring is cooperatively arranged on the outer side 113 of the flange boss. The cross-sectional shapes of seal ring 200, heat-blocking ring 300, and expansion-suppressing ring 400 match the shape of the nozzle end face of exhaust manifold 600 and the shape of the head end face of engine cylinder head 700, and may be other shapes such as circular ring shape, elliptical ring shape, etc., and are not particularly limited herein. Illustratively, the cross-sectional shapes of seal ring 200, heat-resistant ring 300, and expansion-suppressing ring 400 are annular.

So configured, the exhaust manifold sealing structure 1000 is disposed between the nozzle end face of the exhaust manifold 600 and the head end face of the engine cylinder head 700, and high-temperature exhaust gas is discharged from the head end face of the engine cylinder head 700 and enters the exhaust manifold 600 through the nozzle end face of the exhaust manifold 600, so that the high-temperature exhaust gas erodes the sealing flange 100 and the sealing ring 200 of the exhaust manifold sealing structure 1000. When high-temperature exhaust gas enters the exhaust manifold 600, the heat-resistant ring 300 is firstly contacted, the heat conductivity coefficient of the heat-resistant ring 300 is low, the high-temperature exhaust gas is prevented from directly eroding the sealing flange 100 and the sealing ring 200, the elastic attenuation of the sealing ring 200 in a high-temperature environment is reduced, the sealing elasticity of the sealing ring 200 can be effectively maintained, the flange surface temperature of the sealing flange 100 is reduced, the longitudinal thermal deformation degree of the sealing flange 100 is reduced, and the exhaust leakage caused by insufficient compensation quantity of the sealing ring 200 due to overlarge deformation quantity at high temperature is prevented. The heat-resistant ring 300 and the expansion-suppressing ring 400 are matched with each other from the inner side surface 112 of the flange boss and the outer side surface 113 of the flange boss respectively, so that the transverse sliding deformation of the sealing flange 100 is suppressed, the friction damage effect of micro-movement of the sealing flange 100 on the sealing ribs of the sealing ring 200 is reduced, and the exhaust manifold sealing structure 1000 always has enough sealing pressure and reliable sealing performance under the high-temperature exhaust working condition.

The exhaust manifold sealing structure 1000 does not need to change the structure of the engine cylinder head 700, and only the heat-resisting ring 300 and the expansion-suppressing ring 400 are arranged on the sealing flange 100 of the original exhaust manifold 600, and the sealing ring 200 is made of common materials, so that the exhaust manifold sealing structure 1000 still has good sealing performance under the high-temperature exhaust condition.

Referring to fig. 3, 7 and 8, the height of the flange boss inner side surface 112 is equal to the height of the flange boss outer side surface 113, and both the flange boss inner side surface 112 and the flange boss outer side surface 113 are perpendicular to the flange boss top surface 111. The height of the heat-blocking ring outer side 320 is greater than the height of the flange boss inner side 112. So set up, on the one hand, hinder the hot ring 300 and make and hinder the hot ring 300 and can play the heat-resisting function to flange boss medial surface 112, prevent flange boss 110 from being heated to the inboard expansion deformation, on the other hand, hinder the hot ring lateral surface 320 and be higher than the part of flange boss medial surface 112 and can play the heat-resisting function to the sealing ring 200 that locates at flange boss top surface 111, prevent sealing ring 200 from receiving the high temperature exhaust erosion and the performance is impaired. The height of the heat blocking ring outer side 320 is less than the sum of the height of the flange boss inner side 112 and the height of the seal ring 200. By means of the arrangement, the sealing ring 200 can be guaranteed to have a certain elastic interval in the installation and compression process, the heat-resistant ring is prevented from being too high in the outer side face 320, the sealing ring 200 is abutted against the engine cylinder cover 700 and is clamped with the distance between the flange boss top face 111, the sealing ring 200 cannot reach a sealing and compression state, and the optimal heat-resistant effect is guaranteed when the sealing ring 200 is compressed.

Referring to fig. 3 to 8, the height of the expansion-suppressing ring inner side 410 is greater than the height of the flange boss outer side 113, and the height of the expansion-suppressing ring inner side 410 is less than the height of the heat-blocking ring outer side 320. The shortest distance between the tangent of the seal ring outer side 212 and the tangent of the seal ring inner side 211 is the width of the seal ring 200, the shortest distance between the tangent of the flange boss outer side 113 and the tangent of the flange boss inner side 112 is the width of the flange boss top surface 111, and the width of the seal ring 200 is smaller than the width of the flange boss top surface 111. The heat-blocking ring outer side 320 does not abut the seal ring inner side 211 and the expansion-suppressing ring inner side 410 abuts the seal ring outer side 212. So set up, the width of sealing ring 200 is less than the width of flange boss top surface 111 for sealing ring in side 211 does not butt in heat-resisting ring lateral surface 320, sealing ring lateral surface 212 butt in expansion-suppressing ring in side 410, expansion-suppressing ring 400 carries out accurate circumference location installation and has prevented that the excessive location that is located heat-resisting ring 300 one side from leading to is difficult to the installation to sealing ring 200. The inner side surface 410 of the expansion suppressing ring is abutted to the sealing ring 200, a gap is reserved between the upper end surface of the expansion suppressing ring 400 and the engine cylinder cover 700, heat on the sealing ring 200 can be rapidly led out through heat transfer between the expansion suppressing ring 400, external air rapidly flows through the gap between the expansion suppressing ring 400 and the engine cylinder cover 700, heat of the sealing ring 200 and the flange boss 110 is timely taken away, and the working temperature of a workpiece is further reduced.

Preferably, the inner diameter of the heat blocking ring 300 is greater than the diameter of the exhaust manifold bore section 610. With this arrangement, the inner side 310 of the heat-blocking ring does not protrude from the end surface of the nozzle of the exhaust manifold 600, and the heat-blocking ring 300 does not throttle the high-temperature exhaust gas when the high-temperature exhaust gas passes through the exhaust manifold sealing structure 1000, which is advantageous for reducing the resistance of the high-temperature exhaust gas.

Seal ring 200 may be provided in other forms, such as a single layer gasket, a multi-layer gasket, or a C-shaped gasket, without limitation. Illustratively, seal ring 200 includes at least two layers of a laminated gasket 210, gasket 210 being formed with sealing ribs, which are stamped flanges on the body of gasket 210. Compared with the traditional bolt hole positioning type sealing gasket, the bolt fixing is omitted, and the heat transfer distance between the punched sealing rib and the surrounding air is short, so that the heat of the sealing gasket 210 is discharged.

Specifically, the flange boss inner side surface 112 is provided with a first mounting groove, and the heat-resistant ring outer side surface 320 is in interference fit with the flange boss inner side surface 112 through the first mounting groove, so as to inhibit expansion deformation of the flange boss 110 from being heated to the inner side. And/or the flange boss lateral surface 113 is provided with a second mounting groove, and the expansion-inhibiting ring inner lateral surface 410 is in interference fit with the flange boss lateral surface 113 through the second mounting groove, so as to inhibit the expansion deformation of the flange boss 110 when being heated to the outer side. The height of the first mounting groove is smaller than that of the heat-resistant ring outer side face 320, the height of the second mounting groove is smaller than that of the expansion-suppressing ring inner side face 410, and the heat-resistant ring 300 and the expansion-suppressing ring 400 cannot be separated from the first mounting groove and the second mounting groove during mounting, so that the heat-resistant ring is convenient to mount, and the fixing stability of the heat-resistant ring 300 and the expansion-suppressing ring 400 is guaranteed. The first mounting groove and the second mounting groove can be arranged on the inner side surface 112 of the flange boss and the outer side surface 113 of the flange boss in a machining mode, and the machining process is simple and convenient.

Specifically, referring to fig. 1, the exhaust manifold sealing structure 1000 further includes a fastener 500, the fastener 500 fixedly compressing the exhaust manifold sealing structure 1000 between the nozzle end face of the exhaust manifold 600 and the head end face of the engine cylinder head 700. Illustratively, the fastener 500 is a bolt.

The heat-resistant ring 300 is made of a superalloy material. Illustratively, the heat-resistant ring 300 is made of GH4169 material and has good high-temperature resistance and fatigue resistance. The expansion-suppressing ring 400 is made of kovar alloy material.

Referring to fig. 3 and 4, the ring cross section of the heat blocking ring 300 may be rectangular, or may be C-shaped or the like, and is not particularly limited herein. Illustratively, referring to fig. 3, the ring cross section of the heat-resistant ring 300 is rectangular, and referring to fig. 4, the heat-resistant ring 300 is a C-shaped heat-resistant ring 300a, which plays a role in auxiliary sealing. The heat blocking ring 300 may be integrally provided to the engine cylinder head 700, the exhaust manifold 600, or the seal ring 200, without being particularly limited thereto.

The application also proposes an exhaust manifold 2000 with a sealing structure, and the exhaust manifold 2000 with a sealing structure includes an exhaust manifold 600 and the exhaust manifold sealing structure 1000 described above.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples only represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the claims. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.

Claims

1. An exhaust manifold sealing structure for sealing connection between a nozzle end face of an exhaust manifold and a head end face of an engine cylinder head, the exhaust manifold sealing structure comprising:

2. The exhaust manifold sealing structure according to claim 1, wherein the height of the flange boss inner side surface is equal to the height of the flange boss outer side surface, and both the flange boss inner side surface and the flange boss outer side surface are perpendicular to the flange boss top surface; the height of the outer side surface of the heat-resistant ring is larger than that of the inner side surface of the flange boss, and the height of the outer side surface of the heat-resistant ring is smaller than the sum of the height of the inner side surface of the flange boss and the height of the sealing ring.

3. The exhaust manifold sealing structure according to claim 2, wherein the height of the inner side surface of the expansion suppressing ring is larger than the height of the outer side surface of the flange boss, and the height of the inner side surface of the expansion suppressing ring is smaller than the height of the outer side surface of the heat blocking ring.

4. The exhaust manifold sealing structure according to claim 1, wherein a shortest distance between a tangent line of an outer side surface of the seal ring and a tangent line of an inner side surface of the seal ring is a width of the seal ring, a shortest distance between a tangent line of an outer side surface of the flange boss and a tangent line of an inner side surface of the flange boss is a width of a top surface of the flange boss, and the width of the seal ring is smaller than the width of the top surface of the flange boss; the outer side surface of the heat-resistant ring is not abutted to the inner side surface of the sealing ring, and the inner side surface of the expansion-suppressing ring is abutted to the outer side surface of the sealing ring.

5. The exhaust manifold sealing structure according to claim 1, wherein an inner diameter of the heat blocking ring is larger than a diameter of a cross section of the exhaust manifold inner cavity.

6. The exhaust manifold sealing structure according to claim 1, wherein the seal ring includes at least two layers of sealing gaskets provided in a stacked arrangement, the sealing gaskets being formed with sealing beads, the sealing beads being flanges punched on a body of the sealing gaskets.

7. The exhaust manifold sealing structure according to claim 1, wherein a first mounting groove is formed in the inner side surface of the flange boss, and the outer side surface of the heat-resistant ring is in interference fit with the inner side surface of the flange boss through the first mounting groove; and/or the outer side surface of the flange boss is provided with a second mounting groove, and the inner side surface of the expansion inhibiting ring is in interference fit with the outer side surface of the flange boss through the second mounting groove.

8. The exhaust manifold sealing structure according to claim 1, further comprising a fastener that fixedly presses the exhaust manifold sealing structure between a nozzle end face of the exhaust manifold and a head end face of the engine cylinder head.

9. The exhaust manifold sealing structure according to claim 1, further comprising at least one of:

the heat-resistant ring is made of a high-temperature alloy material;

the expansion-inhibiting ring is made of kovar alloy material.

10. An exhaust manifold with a sealing structure, characterized in that the exhaust manifold with a sealing structure comprises:

an exhaust manifold; the method comprises the steps of,

the exhaust manifold sealing structure according to any one of claims 1 to 9.