CN217300698U - Engine exhaust system and cylinder head connecting structure and engine - Google Patents
Engine exhaust system and cylinder head connecting structure and engine Download PDFInfo
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- CN217300698U CN217300698U CN202221331848.9U CN202221331848U CN217300698U CN 217300698 U CN217300698 U CN 217300698U CN 202221331848 U CN202221331848 U CN 202221331848U CN 217300698 U CN217300698 U CN 217300698U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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Abstract
The application discloses engine exhaust system and cylinder head connection structure and engine, including cylinder head, blast pipe and thermal-insulated housing, wherein, the air inlet of blast pipe with the gas vent of cylinder head is connected, thermal-insulated housing includes casing and end cover, the casing with the end cover cooperation forms and holds the airtight cavity of blast pipe, the blast pipe with thermal-insulated clearance has between the inner wall of thermal-insulated housing, the casing with the cylinder head is connected, the casing with be equipped with between the cylinder head and be used for sealing the first seal gasket of airtight cavity. The disclosed engine exhaust system and cylinder head connection structure and engine of this application have reduced first seal gasket's whole operating temperature, can effectively prolong first seal gasket's life, and sealed thermal-insulated effect is excellent, and the split type structure that thermal-insulated housing formed for being cooperated by casing and end cover, machine-shaping technology is simpler, and the processing cost is lower.
Description
Technical Field
The application relates to the technical field of engines, in particular to a connecting structure of an engine exhaust system and a cylinder cover and an engine.
Background
At present, the connection between an engine exhaust pipe and a cylinder cover mostly adopts a structural form of a plane flange and a gasket, and the exhaust pipe is easy to generate certain telescopic deformation due to heating, so that the gasket is extruded to cause failure and air leakage, and the gasket is damaged due to direct erosion and corrosion of high-temperature waste gas. Therefore, each engine manufacturer optimally adopts a method of spraying a high-temperature-resistant lubricant on the surface of the gasket or a graphite composite gasket or a multilayer metal gasket to solve the problems that the exhaust pipe deforms and extrudes the gasket and the gasket is eroded by high-temperature waste gas, so that the connection between the exhaust pipe and the cylinder cover is realized and the sealing life is kept for a long time. The problem that the gasket is damaged by extrusion due to deformation of an exhaust pipe can be solved to a certain extent by spraying a high-temperature-resistant lubricant on the surface of the gasket or adopting a graphite composite gasket or a multilayer metal gasket, but the problems of direct erosion and corrosion of the gasket on high-temperature exhaust gas cannot be solved well, the edge inside the gasket can be generally directly contacted with the high-temperature exhaust gas of an engine and can be directly eroded and corroded by the high-temperature exhaust gas, cracks or fractures occur at a position with large thermal stress of the gasket due to continuous erosion and corrosion of the exhaust gas and continuous action of the thermal stress, so that the gasket is failed and leaks gas, and the leaked exhaust gas can pollute the atmospheric environment.
Furthermore, in the case of engines, in particular for marine engines, regulations require that protective devices must be added to the parts whose exposed surface reaches above 220 ℃ in order to reduce the cabin temperature, while taking into account the safety of the operators. At present, a common heat insulation mode is adopted, for example, a thick heat insulation layer is wrapped on the periphery of the exhaust pipe to realize heat insulation, however, the wrapped heat insulation is difficult to completely cover and easy to crack at high temperature, and the wrapped heat insulation is not beautiful and causes great difficulty to the arrangement of surrounding parts. In addition, a water jacket can be cast around the exhaust pipe, so that a water cavity is formed between the water jacket and the exhaust pipe, cooling water passes through the water cavity to directly cool the exhaust pipe, and the exhaust pipe and the water jacket are integrally cast.
SUMMERY OF THE UTILITY MODEL
The application provides an engine exhaust system and cylinder head connection structure and engine to solve at least one technical problem among the above-mentioned technical problem.
The technical scheme adopted by the application is as follows:
the utility model provides an engine exhaust system and cylinder head connection structure, includes cylinder head, blast pipe and thermal-insulated housing, wherein, the air inlet of blast pipe with the gas vent of cylinder head is connected, thermal-insulated housing includes casing and end cover, the casing with the end cover cooperation forms and holds the airtight cavity of blast pipe, the blast pipe with thermal-insulated clearance has between the inner wall of thermal-insulated housing, the casing with the cylinder head is connected, the casing with be equipped with between the cylinder head and be used for sealing the first seal gasket of airtight cavity.
The connecting structure of the engine exhaust system and the cylinder cover further has the following additional technical characteristics:
a first heat insulation cavity is arranged between the inner wall surface and the outer wall surface of the shell, and the shell is provided with a first water inlet and a first water outlet which are respectively communicated with the first heat insulation cavity.
And a second heat insulation cavity is arranged between the inner wall surface and the outer wall surface of the end cover, and the end cover is provided with a second water inlet and a second water outlet which are respectively communicated with the second heat insulation cavity.
The exhaust pipe is connected with the cylinder head through a bolt fastener.
The housing is removably connected to the end cap.
And a second sealing gasket is arranged between the shell and the end cover.
One of the shell and the end cover is provided with an inserting projection, the other of the shell and the end cover is provided with a slot, and the shell and the end cover are connected through the inserting projection and the slot in an inserting way; and/or the shell and the end cover are connected through a bolt fastener.
The application provides an engine, which comprises the engine exhaust system and cylinder cover connecting structure.
Due to the adoption of the technical scheme, the technical effects obtained by the application are as follows:
1. compared with the prior mode of arranging the sealing gasket between the exhaust pipe and the cylinder cover, the sealing gasket is arranged between the shell and the cylinder cover, the sealing of the closed cavity is improved through the first sealing gasket, the sealing requirement between the exhaust pipe and the cylinder cover exhaust port is greatly reduced, even the sealing gasket arranged between the exhaust pipe and the cylinder cover exhaust port can be cancelled, under the condition that the sealing gasket is not arranged between the exhaust pipe and the cylinder cover exhaust port, high-temperature waste gas can not directly erode and corrode the first sealing gasket between the shell and the cylinder cover, the problem that the first sealing gasket is unevenly heated to generate thermal stress is solved, the overall working temperature of the first sealing gasket is reduced, the service environment is improved, and the service life of the first sealing gasket can be effectively prolonged. In the course of the work, rely on waste gas to leak the thermal-insulated clearance between blast pipe and the thermal-insulated housing, reach gaseous self sealss of formation after certain internal balance in the thermal-insulated clearance, sealed thermal-insulated effect is excellent.
2. This application makes to form the airtight cavity that holds the blast pipe between the thermal-insulated housing, and thermal-insulated clearance has between the inner wall of blast pipe and thermal-insulated housing, not only can guarantee that the temperature that thermal-insulated housing exposes the surface satisfies the law demand, still can make thermal-insulated housing and blast pipe be two relatively independent structures, thermal-insulated housing and blast pipe not direct contact, form the thermal-insulated mode in clearance, the problem of thermal-insulated effect is reduced because of direct contact to thermal-insulated housing and blast pipe body has been alleviated, the condition that booster turbine energy is not enough has been solved, engine for the yacht to high performance has been reduced, the difficulty of booster matching and lectotype, and, higher exhaust temperature can promote the purification efficiency of SCR after-treatment system (selective catalytic reduction technique), reduce urea injection volume. In addition, compared with the mode that a layer of water jacket is cast around the exhaust pipe in the prior art, the heat-insulating cover shell is of a split structure formed by matching the shell and the end cover, the machining and forming process is simpler, and the machining cost is lower.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
fig. 1 is a schematic structural diagram of a connection structure of an engine exhaust system and a cylinder head according to an embodiment of the present disclosure.
Reference numerals: the gas cylinder cover comprises a gas cylinder cover 1, a gas exhaust pipe 2, a heat insulation cover 3, a shell 31, a first heat insulation cavity 311, an end cover 32, a second heat insulation cavity 321, a heat insulation gap 4, a first sealing gasket 5, a bolt fastener 6 and a second sealing gasket 7.
Detailed Description
In order to more clearly explain the overall concept of the present application, the following detailed description is given by way of example in conjunction with the accompanying drawings.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, however, the present application may be practiced in other ways than those described herein, and therefore the scope of the present application is not limited by the specific embodiments disclosed below.
In addition, in the description of the present application, it is to be understood that the terms "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," and the like refer to orientations or positional relationships illustrated in the drawings, which are used for convenience in describing the present application and to simplify the description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered limiting of the present application.
In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; the connection can be mechanical connection, electrical connection or communication; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In this application, unless expressly stated or limited otherwise, a first feature is "on" or "under" a second feature such that the first and second features are in direct contact, or the first and second features are in indirect contact via an intermediary. In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
In the embodiment of the application, an engine exhaust system and cylinder head connecting structure and an engine are provided, and for convenience of explanation and understanding, the following contents are provided on the basis of the structure of the product shown in the drawing. Of course, it is understood by those skilled in the art that the above-described structure is only used as a specific example and illustrative illustration, and does not constitute a specific limitation to the technical solution provided by the present application.
As shown in fig. 1, an engine exhaust system and cylinder head connecting structure includes a cylinder head 1, an exhaust pipe 2, and a heat insulating housing 3, wherein an intake port of the exhaust pipe 2 is connected to an exhaust port of the cylinder head 1, the heat insulating housing 3 includes a casing 31 and an end cap 32, the casing 31 and the end cap 32 cooperate to form a closed cavity for accommodating the exhaust pipe 2, a heat insulating gap 4 is formed between the exhaust pipe 2 and an inner wall of the heat insulating housing 3, the casing 31 is connected to the cylinder head 1, and a first sealing gasket 5 for sealing the closed cavity is disposed between the casing 31 and the cylinder head 1.
Compared with the prior mode of arranging the sealing gasket between the exhaust pipe and the cylinder cover, the sealing gasket is arranged between the shell 31 and the cylinder cover 1, the sealing of the closed cavity is improved through the first sealing gasket 5, the sealing requirement between the exhaust pipe 2 and the exhaust port of the cylinder cover 1 is greatly reduced, even the sealing gasket arranged between the exhaust pipe 2 and the exhaust port of the cylinder cover 1 can be cancelled, the sealing gasket is not arranged between the exhaust pipe 2 and the exhaust port of the cylinder cover 1, high-temperature waste gas can not directly erode and corrode the first sealing gasket 5 between the shell 31 and the cylinder cover 1, the problem that the first sealing gasket 5 generates thermal stress due to uneven heating is solved, the overall working temperature of the first sealing gasket 5 is reduced, the service environment is improved, and the service life of the first sealing gasket 5 can be effectively prolonged. In the course of the work, rely on waste gas to leak the thermal-insulated clearance 4 between blast pipe 2 and the thermal-insulated housing 3, reach gaseous self sealss of formation after certain interior balance in the thermal-insulated clearance 4, sealed thermal-insulated effect is excellent.
This application makes and forms the airtight cavity that holds blast pipe 2 between the thermal-insulated housing 3, and thermal-insulated clearance 4 has between blast pipe 2 and the inner wall of thermal-insulated housing 3, not only can guarantee that the temperature of thermal-insulated housing exposed surface can satisfy the regulation demand, still can make thermal-insulated housing 3 and blast pipe 2 be two relatively independent structures, thermal-insulated housing 3 and blast pipe 2 indirect contact not, form the thermal-insulated mode in clearance, it reduces thermal-insulated effect because of direct contact with thermal-insulated housing 3 and blast pipe 2 body to have alleviated, increase calorific loss's problem, the condition that booster turbine energy is not enough has been solved, engine for the yacht of high performance has been reduced, the difficulty of booster matching and lectotype, and, higher exhaust temperature can promote SCR aftertreatment system's purification efficiency, reduce urea injection volume. In addition, compared with the mode of casting a layer of water jacket around the exhaust pipe in the prior art, the heat-insulating cover 3 in the application is a split structure formed by matching the shell 31 and the end cover 32, so that the machining and forming process is simpler, and the machining cost is lower.
As a preferred embodiment of the present invention, as shown in fig. 1, a first heat insulation chamber 311 is provided between an inner wall surface and an outer wall surface of the housing 31, and the housing 31 is provided with a first water inlet and a first water outlet which are respectively communicated with the first heat insulation chamber 311.
As another preferred embodiment of the present application, as shown in fig. 1, a second insulating chamber 321 is disposed between an inner wall surface and an outer wall surface of the end cap 32, and the end cap 32 is provided with a second water inlet and a second water outlet respectively communicating with the second insulating chamber 321.
As can be understood by those skilled in the art, by providing the first insulating cavity 311, the first water inlet and the first water outlet in the housing 31 and the second insulating cavity 321, the second water inlet and the second water outlet in the end cap 32, the cooling liquid can be circulated into the first insulating cavity 311 and the second insulating cavity 321, so as to cool the exhaust system. Moreover, on the basis that heat insulation gap 4 is arranged between heat insulation cover 3 and exhaust pipe 2, first heat insulation cavity 311 and second heat insulation cavity 321 are not in direct contact with exhaust pipe 2, therefore, the heat of too many exhaust pipes 2 can be prevented from being taken away by the cooling liquid, it is ensured that the exhaust gas has higher exhaust temperature, higher exhaust gas temperature is favorable for improving the catalytic oxidation efficiency of the engine SCR post processor to the exhaust gas, and the heat dissipation capacity of cylinder cover water channel cooling liquid can be reduced, and the cooling effect is favorable for improving.
As a preferred embodiment of the present application, as shown in fig. 1, the exhaust pipe 2 is connected to the cylinder head 1 by a bolt fastener 6.
As can be understood by those skilled in the art, the exhaust pipe 2 and the cylinder head 1 are connected through the bolt fastener 6, so that the exhaust pipe 2 and the cylinder head 1 are convenient and quick to install, the connection reliability is high, and the exhaust pipe 2 and the cylinder head 1 can be disassembled so as to be replaced when the exhaust pipe 2 is aged or damaged.
As a preferred embodiment of the present application, the housing 31 and the cap 32 may be detachably coupled.
As will be understood by those skilled in the art, by detachably connecting the housing 31 and the end cap 32, the exhaust pipe 2 can be repaired or replaced by detaching the end cap 32 from the housing 31 to expose the exhaust pipe 2, without detaching the entire heat insulating housing 3 from the cylinder head 1, i.e., without detaching the housing 31 and the first sealing gasket 5 from the cylinder head 1, thereby preventing the sealing performance of the first sealing gasket 5 from being affected by deformation and displacement of the first sealing gasket 5 caused by repeated detachment and detachment of the housing 31.
As a preferred embodiment, as shown in fig. 1, a second sealing gasket 7 is disposed between the housing 31 and the end cap 32. Through the setting of second seal gasket 7, further promoted the leakproofness of the inside airtight cavity of thermal-insulated housing 3, avoided waste gas to reveal and cause environmental pollution.
It should be noted that, although the drawings do not illustrate the detachable connection manner of the housing 31 and the end cover 32, at least one of the following embodiments may be adopted:
example 1: one of the shell 31 and the end cover 32 is provided with an insertion protrusion, and the other of the shell 31 and the end cover 32 is provided with a slot, and the shell 31 and the end cover 32 are connected by the insertion protrusion and the slot in an insertion manner.
Example 2: the housing 31 and the end cap 32 are connected by a bolt fastener.
Example 3: as a preferred embodiment, it is possible to combine embodiment 1 and embodiment 2, that is, the housing 31 and the end cap 32 are connected by both the insertion projection and the insertion groove and by a bolt fastening. During specific assembly, the shell 31 and the end cover 32 can be preassembled by using the plug-in fit of the plug-in protrusion and the socket, so that the assembly process of the subsequent bolt fastener is facilitated, and the assembly efficiency is improved.
The application provides an engine, which comprises the engine exhaust system and cylinder cover connecting structure.
It should be noted that, since the engine provided by the present application includes the connection structure between the engine exhaust system and the cylinder head in any of the above embodiments, beneficial effects of the connection structure between the engine exhaust system and the cylinder head are all included in the engine provided by the present application, and are not described herein again.
Where not mentioned in this application, this may be achieved using or taking advantage of existing technology.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments.
The above are merely examples of the present application and are not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (8)
1. An engine exhaust system and cylinder head connection structure, comprising:
a cylinder head;
an exhaust pipe having an intake port connected to an exhaust port of the cylinder head;
the heat insulation cover comprises a shell and an end cover, the shell and the end cover are matched to form a closed cavity for accommodating the exhaust pipe, a heat insulation gap is formed between the exhaust pipe and the inner wall of the heat insulation cover, the shell is connected with the cylinder cover, and a first sealing gasket for sealing the closed cavity is arranged between the shell and the cylinder cover.
2. The engine exhaust system and cylinder head connection structure according to claim 1, wherein a first insulating chamber is provided between an inner wall surface and an outer wall surface of the housing, and the housing is provided with a first water inlet and a first water outlet which are respectively communicated with the first insulating chamber.
3. The engine exhaust system and cylinder head connection structure according to claim 1, wherein a second heat insulation chamber is provided between the inner wall surface and the outer wall surface of the end cap, and the end cap is provided with a second water inlet and a second water outlet which are respectively communicated with the second heat insulation chamber.
4. The engine exhaust system and cylinder head connection structure according to claim 1, wherein the exhaust pipe and the cylinder head are connected by a bolt fastener.
5. An engine exhaust system and cylinder head connection according to claim 1, wherein the housing is removably connected to the end cap.
6. The engine exhaust system and cylinder head connection according to claim 5, wherein a second sealing gasket is disposed between the housing and the end cap.
7. The connection structure of the engine exhaust system and the cylinder head according to claim 5, wherein one of the housing and the end cover is provided with a plug-in protrusion, and the other of the housing and the end cover is provided with a socket, and the housing and the end cover are connected by the plug-in protrusion and the socket in a plug-in manner; and/or the shell and the end cover are connected through a bolt fastener.
8. An engine characterized by comprising the engine exhaust system and cylinder head connection structure according to any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221331848.9U CN217300698U (en) | 2022-05-30 | 2022-05-30 | Engine exhaust system and cylinder head connecting structure and engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221331848.9U CN217300698U (en) | 2022-05-30 | 2022-05-30 | Engine exhaust system and cylinder head connecting structure and engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217300698U true CN217300698U (en) | 2022-08-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221331848.9U Active CN217300698U (en) | 2022-05-30 | 2022-05-30 | Engine exhaust system and cylinder head connecting structure and engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217300698U (en) |
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2022
- 2022-05-30 CN CN202221331848.9U patent/CN217300698U/en active Active
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