Sealing gasket for exhaust system of internal combustion engine

Abstract

The utility model discloses a sealing gasket for an exhaust system of an internal combustion engine and belongs to the field of sealing gaskets. The sealing gasket comprises a gasket body assembly, the gasket body assembly comprises a middle gasket body and a metal outer gasket arranged on one side or two sides of the middle gasket body, a protective ring is arranged at an air channel opening of the gasket body assembly, a reinforcing ring is arranged between a pressing ring of the protective ring and one side or two sides of the gasket body assembly, and the pressing ring of the protective ring is pressed on the gasket body assembly. The pressing ring wraps the outer side of the reinforcing ring, and the pressing ring is flush with or roughly flush with the surface of the pad body assembly. According to the sealing gasket, the advantages of an existing all-metal sealing gasket and an existing composite sealing gasket are combined, the reinforcing ring is introduced to the sealing position of the air channel opening of the gasket, then the protective ring is used for wrapping, the peripheral gasket body assembly is combined, the high-low matching sealing effect with the moderate internal and external hardness is achieved, and the sealing gasket can keep the sealing stability and reliability at the high temperature; through large-scale verification, the sealing performance and durability of the sealing gasket of the exhaust system are far better than those of the existing all-metal sealing gasket and composite sealing gasket.

Description

Technical Field

[0001] The utility model relates to a sealing gasket, more specifically, to a sealing gasket for an exhaust system of an internal combustion engine. Background Art

[0002] The exhaust system is an important part of the internal combustion engine. It is usually installed in the exhaust duct of the cylinder head and other locations through a sealing gasket. During the operation of the engine, the high-temperature exhaust gas discharged from the combustion chamber enters the exhaust pipe through the cylinder head exhaust duct. The temperature of the high-temperature exhaust gas is often as high as hundreds of degrees Celsius, so its sealing gasket is required to have reliable high temperature resistance and sealing stability.

[0003] The exhaust system of a multi-cylinder turbocharged internal combustion engine generally includes five types: turbine inlet gasket, turbine outlet gasket, EGR gasket, exhaust pipe gasket and exhaust manifold gasket. Currently, there are two main types of such gaskets: all-metal gaskets and composite gaskets. All-metal gaskets are made of stainless steel and are divided into single-layer or multi-layer stacking schemes. Because they are rigid seals, they are generally not airtight. Composite gaskets are generally suitable for non-supercharged internal combustion engines. Supercharged internal combustion engines are prone to ablation damage due to high temperatures. For example, Chinese patent application No. 201510565635.0 discloses "a high-power diesel engine graphite exhaust manifold gasket", whose gasket body is composed of cold-rolled steel plates and graphite plates inlaid and composited, and a stainless steel guard ring is set at the cylinder port. Chinese patent No. 201821198794.7 discloses an inlaid structure exhaust gasket, whose gasket body is composed of sprinted steel plates and graphite plates inlaid and composited, and a metal guard ring is also set at the cylinder port. The above patent application mainly utilizes the compression and rebound of the gasket body to ensure the sealing performance. However, as the engine performance improves, the sealing performance at the gasket mouth decreases due to the high temperature, which in turn affects the sealing reliability of the exhaust system gasket. Summary of the invention

[0004] 1. Technical problems to be solved by the utility model

[0005] The purpose of the utility model is to overcome the shortcomings of existing exhaust system gaskets such as poor sealing reliability, and to provide an internal combustion engine exhaust system gasket. By adopting the technical scheme of the utility model, the gasket body of the gasket is composed of an intermediate gasket body and a metal outer gasket, and a reinforcing ring is arranged at the airway opening of the gasket body assembly by wrapping a protective ring. The pressure ring of the protective ring is pressed onto the gasket body assembly and is flush or roughly flush with the surface of the gasket body assembly, which not only increases the structural strength and temperature resistance of the gasket airway opening, but also forms a high and low matching sealing effect with moderate hardness and softness inside and outside the gasket body assembly and the reinforced structure at the airway opening, so that the exhaust system gasket can maintain sealing stability and reliability even at high temperatures. After large-scale verification, the sealing and durability of the exhaust system gasket far exceed those of existing all-metal gaskets and composite gaskets.

[0006] 2. Technical solution

[0007] In order to achieve the above-mentioned purpose, the technical solution provided by the utility model is:

[0008] The utility model discloses a sealing gasket for an internal combustion engine exhaust system, comprising a gasket body assembly, wherein the gasket body assembly comprises an intermediate gasket body and a metal outer gasket arranged on one side or both sides of the intermediate gasket body, a guard ring is arranged at the airway opening of the gasket body assembly, a reinforcement ring is arranged between a pressure ring of the guard ring and one side or both sides of the gasket body assembly, the pressure ring of the guard ring is pressed onto the gasket body assembly and wrapped around the outside of the reinforcement ring, and the pressure ring is flush or approximately flush with the surface of the gasket body assembly.

[0009] Furthermore, the reinforcement ring is provided with at least one circle of convex ribs.

[0010] Furthermore, the reinforcement ring is a single-piece structure or a multi-piece stacked structure.

[0011] Furthermore, metal outer pads are provided on both sides of the middle pad body, and the middle pad body and the metal outer pads on both sides are pressed and connected together by the pressure ring of the guard ring.

[0012] Furthermore, the intermediate pad body is a steel frame graphite composite pad or a steel frame fiber composite pad.

[0013] Furthermore, the steel frame fiber composite pad is an asbestos fiber steel frame composite pad or an asbestos-free fiber steel frame composite pad.

[0014] Furthermore, the steel frame graphite composite pad is composited by a graphite plate and a steel frame plate, and the steel frame plate is located on the inner side of the steel frame graphite composite pad.

[0015] Furthermore, the retaining ring and the reinforcing ring are both made of stainless steel.

[0016] Furthermore, the internal combustion engine exhaust system sealing gasket is one of a turbine inlet gasket, a turbine outlet gasket, an exhaust manifold gasket, an EGR gasket and an exhaust pipe gasket.

[0017] 3. Beneficial effects

[0018] Compared with the existing known technologies, the technical solution provided by the utility model has the following beneficial effects:

[0019] (1) The utility model discloses a gasket for an exhaust system of an internal combustion engine, which comprises a gasket body assembly, the gasket body assembly comprises an intermediate gasket body and a metal outer gasket arranged on one side or both sides of the intermediate gasket body, a guard ring is arranged at the airway opening of the gasket body assembly, a reinforcing ring is arranged between the pressure ring of the guard ring and one side or both sides of the gasket body assembly, the pressure ring of the guard ring is pressed on the gasket body assembly and wrapped on the outside of the reinforcing ring, and the pressure ring is flush or roughly flush with the surface of the gasket body assembly; the gasket combines the advantages of existing all-metal gaskets and composite gaskets, introduces a reinforcing ring at the airway opening sealing of the gasket, and then covers it with a guard ring, and combines the gasket body assembly composed of the intermediate gasket body and the metal outer gasket on the periphery, so as to form a high-low matching sealing effect with moderate hardness and softness inside and outside, so that the exhaust system gasket can maintain the stability and reliability of sealing even at high temperatures. After large-scale verification, the sealing and durability of the exhaust system gasket far exceed those of existing all-metal gaskets and composite gaskets;

[0020] (2) The utility model provides a sealing gasket for an exhaust system of an internal combustion engine, wherein at least one circle of convex ribs is provided on the reinforcing ring, and the convex ribs on the reinforcing ring are used to further improve the rigidity of the reinforcing ring. At the same time, the convex ribs are elastic, and the sealing effect is better, which can ensure the reliability of the sealing of the airway opening;

[0021] (3) The utility model is a sealing gasket for an internal combustion engine exhaust system, in which metal outer gaskets are provided on both sides of an intermediate gasket body. The intermediate gasket body and the metal outer gaskets on both sides are pressed together by a pressure ring of a protective ring, and the manufacturing of the sealing gasket is simple and convenient; the metal outer gasket has the advantage of good surface sealing, and the intermediate gasket body has the compression resilience of a composite gasket body, which greatly improves the sealing effect of the sealing gasket. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the disassembled structure of a sealing gasket for an internal combustion engine exhaust system according to Embodiment 1 of the utility model;

[0023] Figure 2 This is a schematic diagram of the planar structure of a sealing gasket for an internal combustion engine exhaust system according to Embodiment 1 of the utility model;

[0024] Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure in the AA direction;

[0025] Figure 4 This is a schematic diagram of the disassembled structure of a sealing gasket for an internal combustion engine exhaust system according to Embodiment 2 of the utility model;

[0026] Figure 5 It is a partial cross-sectional structural schematic diagram of an internal combustion engine exhaust system sealing gasket according to Embodiment 2 of the utility model;

[0027] Figures 6 to 10 The following are structural diagrams of several internal combustion engine exhaust system gaskets in the utility model, among which Figure 6 This is the structural diagram of the turbine inlet gasket. Figure 7 This is the structural diagram of the turbine outlet gasket. Figure 8 This is a schematic diagram of the structure of the exhaust manifold gasket. Fig. 9 The schematic diagram of the structure of the EGR gasket is shown in Figure 2. Fig.10 It is a schematic diagram of the structure of the exhaust pipe gasket.

[0028] Explanation of the symbols in the schematic diagram:

[0029] 1. Pad assembly; 1-1. Middle pad; 1-1a. Graphite plate; 1-1b. Steel frame plate; 1-2. Metal outer pad; 2. Airway opening; 3. Reinforcement ring; 3-1. Raised rib; 4. Guard ring; 4-1. Pressing ring. DETAILED DESCRIPTION

[0030] In order to further understand the content of the utility model, the utility model is described in detail in conjunction with the drawings and embodiments.

[0031] [Example 1]

[0032] Combination Figure 1 , Figure 2 and Figure 3 As shown, a sealing gasket for an exhaust system of an internal combustion engine in this embodiment includes a gasket body assembly 1, which is the main body of the gasket for the exhaust system of the internal combustion engine. The gasket body assembly 1 includes an intermediate gasket body 1-1 and a metal outer gasket 1-2 arranged on one side or both sides of the intermediate gasket body 1-1 to form a multi-layer gasket structure. A guard ring 4 is provided at the airway opening 2 of the gasket body assembly 1. The cross-sectional shape of the guard ring 4 is "U"-shaped. The guard ring 4 is wrapped around the edge of the airway opening 2. A reinforcement ring 3 is provided between the pressure ring 4-1 of the guard ring 4 and one side of the gasket body assembly 1. The pressure ring 4-1 of the guard ring 4 is pressed onto the gasket body assembly 1 and wrapped around the outside of the reinforcement ring 3. The pressure ring 4-1 is flush or approximately flush with the surface of the gasket body assembly 1. During production, the gasket body assembly 1, the reinforcement ring 3 and the guard ring 4 are pressed together. Figure 1 The reinforcing ring 3 and the retaining ring 4 are assembled together in the state shown, and then the inner ring of the retaining ring 4 is flanged and pressed to form the pressure ring 4-1 on the other side. Since the middle pad 1-1 of the pad assembly 1 is made of a soft material, the reinforcing ring 3 and the pressure ring 4-1 of the retaining ring 4 are pressed into the surface of the pad assembly 1 under pressure, so that the reinforcing ring 3 and the retaining ring 4 are formed on the pad assembly 1. Figure 3The embedded structure of the state eventually forms a state in which the pressure ring 4-1 is flush or roughly flush with the surface of the gasket body assembly 1. The metal outer gasket 1-2 is attached to the middle gasket body 1-1, and the two are fixed together by the compression of the retaining ring 4 after being positioned. The use of this internal combustion engine exhaust system gasket combines the advantages of existing all-metal gaskets and composite gaskets, introduces a reinforcing ring 3 at the sealing part of the airway opening 2 of the gasket, and then covers it with a retaining ring 4, and combines the outer gasket body assembly 1 composed of the middle gasket body 1-1 and the metal outer gasket 1-2 to form a high and low matching sealing effect with moderate hardness and softness inside and outside, so that the exhaust system gasket can maintain the stability and reliability of sealing even at high temperatures. After large-scale verification, the sealing and durability of the exhaust system gasket far exceed the existing all-metal gaskets and composite gaskets.

[0033] Reference Figure 1 and Figure 3 As shown, in this embodiment, at least one circle of ribs 3-1 is provided on the reinforcing ring 3, and the ribs 3-1 can be formed on the reinforcing ring 3 by a stamping process, and multiple ribs 3-1 can be provided as needed. The ribs 3-1 on the reinforcing ring 3 further improve the rigidity of the reinforcing ring 3, and the ribs 3-1 are elastic, and the sealing effect is better. Furthermore, the ribs 3-1 on the reinforcing ring 3 can protrude to the outside of the cushion body assembly 1, or can protrude to the inside of the cushion body assembly 1. After installation, the retaining ring 4 is compressed to compress the ribs 3-1, thereby improving the elasticity of the sealing gasket at the airway opening 2 and ensuring the sealing reliability of the airway opening 2. Specifically in this embodiment, the reinforcing ring 3 can be a single-piece structure or a multi-piece superimposed structure. The multi-piece superimposed structure refers to two or more reinforcing rings 3 that are superimposed and compounded and then wrapped and fixed on the cushion body assembly 1 by the retaining ring 4.

[0034] In this embodiment, metal outer pads 1-2 are provided on both sides of the middle pad body 1-1, and the middle pad body 1-1 and the metal outer pads 1-2 on both sides are pressed together by the pressure ring 4-1 of the protective ring 4. The production of the sealing pad is simple and convenient. The metal outer pad 1-2 has the advantage of good surface sealing, and the middle pad body 1-1 has the compression resilience of the composite pad body, which greatly improves the sealing effect of the sealing pad. The above-mentioned middle pad body 1-1 is a steel frame graphite composite pad or a steel frame fiber composite pad, wherein the steel frame fiber composite pad can be an asbestos fiber steel frame composite pad or an asbestos-free fiber steel frame composite pad. The steel frame graphite composite pad is composited by a graphite plate 1-1a and a steel frame plate 1-1b (such as Figure 3As shown in the figure, the steel frame plate 1-1b is located on the inner side of the steel frame graphite composite pad. The steel frame plate 1-1b serves as the skeleton of the pad body. The graphite plate 1-1a has high temperature stability, which further ensures the temperature resistance and sealing effect of the exhaust pipe gasket. Furthermore, the above-mentioned retaining ring 4 and reinforcing ring 3 are both made of stainless steel material, which has a simple structure, is easy to make, and has a more reliable seal and is not prone to air leakage. The metal outer pad 1-2 can also be made of heat-resistant metal materials such as stainless steel. The shape and size of the metal outer pad 1-2 are the same as those of the middle pad body 1-1.

[0035] [Example 2]

[0036] Reference Figure 4 and Figure 5 As shown, the internal combustion engine exhaust system gasket of this embodiment has the same basic structure and working principle as that of embodiment 1, except that:

[0037] In this embodiment, a reinforcing ring 3 is provided between the pressing ring 4-1 of the retaining ring 4 and both sides of the cushion body component 1. The pressing ring 4-1 of the retaining ring 4 is pressed on the cushion body component 1 and wrapped around the outer side of the reinforcing ring 3. The pressing ring 4-1 is flush or substantially flush with the surface of the cushion body component 1. When manufacturing, the cushion body component 1, the reinforcing ring 3 and the retaining ring 4 are pressed together. Figure 4 The inner ring of the retainer 4 is then flanged and pressed to form the pressure ring 4-1 on the other side. Since the middle pad 1-1 of the pad assembly 1 is made of a relatively soft material, the reinforcing rings 3 on both sides and the pressure ring 4-1 of the retainer 4 are pressed into the surface of the pad assembly 1 under pressure, so that the reinforcing ring 3 and the retainer 4 are formed on the pad assembly 1. Figure 5 The embedded structure of the state finally forms a state in which the pressure ring 4-1 is flush or approximately flush with the surface of the gasket body assembly 1. With the above-mentioned internal combustion engine exhaust system gasket, the gasket body assembly and the reinforcement structure at the airway opening form a high-low matching sealing effect with moderate hardness and softness inside and outside, so that the exhaust system gasket can maintain the stability and reliability of sealing even at high temperatures.

[0038] The utility model provides a sealing gasket for an internal combustion engine exhaust system, which is not limited to the gasket shapes in the above-mentioned embodiments 1 and 2. Figures 6 to 10 Several common gasket types in the exhaust system of internal combustion engines are given in Figure 6 This is the structural diagram of the turbine inlet gasket. Figure 7 This is the structural diagram of the turbine outlet gasket. Figure 8 This is a schematic diagram of the structure of the exhaust manifold gasket. Fig. 9 The schematic diagram of the structure of the EGR gasket is shown in Figure 2. Fig.10 The exhaust system gaskets mentioned above can all be improved by adopting the above-mentioned enhanced structure to replace the existing all-metal gaskets and improve the sealing performance and durability of the gaskets.

[0039] The utility model discloses a sealing gasket for an internal combustion engine exhaust system, wherein the gasket body is composed of an intermediate gasket body and a metal outer gasket, and a reinforcing ring is arranged at the airway opening of the gasket body component by wrapping a protective ring, and the pressure ring of the protective ring is pressed onto the gasket body component and is flush or approximately flush with the surface of the gasket body component, which not only increases the structural strength and temperature resistance of the gasket airway opening, but also forms a high and low matching sealing effect with moderate hardness and softness inside and outside the gasket body component and the reinforced structure at the airway opening, so that the exhaust system gasket can maintain the sealing stability and reliability even at high temperatures. After large-scale verification, the sealing and durability of the exhaust system gasket far exceed those of existing all-metal gaskets and composite gaskets.

[0040] The above schematically describes the present invention and its implementation methods, which are not restrictive. The drawings show only one implementation method of the present invention, and the actual structure is not limited thereto. Therefore, if ordinary technicians in the field are inspired by it and design structural methods and embodiments similar to the technical solution without creative design without departing from the purpose of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A sealing gasket for an internal combustion engine exhaust system, characterized in that: The invention comprises a cushion body assembly (1), wherein the cushion body assembly (1) comprises an intermediate cushion body (1-1) and a metal outer cushion (1-2) arranged on one side or both sides of the intermediate cushion body (1-1); a protective ring (4) is arranged at the airway opening (2) of the cushion body assembly (1); a reinforcing ring (3) is arranged between a pressure ring (4-1) of the protective ring (4) and one side or both sides of the cushion body assembly (1); the pressure ring (4-1) of the protective ring (4) is pressed onto the cushion body assembly (1) and wrapped around the outer side of the reinforcing ring (3); the pressure ring (4-1) is flush or approximately flush with the surface of the cushion body assembly (1).

2. The internal combustion engine exhaust system gasket according to claim 1, characterized in that: The reinforcement ring (3) is provided with at least one circle of convex ribs (3-1).

3. The internal combustion engine exhaust system gasket according to claim 1 or 2, characterized in that: The reinforcement ring (3) is a single-piece structure or a multi-piece stacked structure.

4. The internal combustion engine exhaust system gasket according to claim 1 or 2, characterized in that: Metal outer pads (1-2) are provided on both sides of the middle pad body (1-1), and the middle pad body (1-1) and the metal outer pads (1-2) on both sides are pressed and connected together through the pressing ring (4-1) of the retaining ring (4).

5. The internal combustion engine exhaust system gasket according to claim 4, characterized in that: The intermediate pad body (1-1) is a steel frame graphite composite pad or a steel frame fiber composite pad.

6. The internal combustion engine exhaust system gasket according to claim 5, characterized in that: The steel frame fiber composite pad is an asbestos fiber steel frame composite pad or an asbestos-free fiber steel frame composite pad.

7. The internal combustion engine exhaust system gasket according to claim 5, characterized in that: The steel frame graphite composite pad is composited from a graphite plate (1-1a) and a steel frame plate (1-1b), and the steel frame plate (1-1b) is located on the inner side of the steel frame graphite composite pad.

8. The internal combustion engine exhaust system gasket according to claim 1 or 2, characterized in that: The retaining ring (4) and the reinforcing ring (3) are both made of stainless steel.

9. The internal combustion engine exhaust system gasket according to claim 1 or 2, characterized in that: The internal combustion engine exhaust system sealing gasket is one of a turbine inlet gasket, a turbine outlet gasket, an exhaust manifold gasket, an EGR gasket and an exhaust pipe gasket.

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