CN215907961U - High-strength combined cylinder cover for large-cylinder-diameter medium-high speed diesel engine - Google Patents
High-strength combined cylinder cover for large-cylinder-diameter medium-high speed diesel engine Download PDFInfo
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- CN215907961U CN215907961U CN202122271526.1U CN202122271526U CN215907961U CN 215907961 U CN215907961 U CN 215907961U CN 202122271526 U CN202122271526 U CN 202122271526U CN 215907961 U CN215907961 U CN 215907961U
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Abstract
The high-strength combined cylinder cover for the large-cylinder-diameter medium-high speed diesel engine is provided, wherein an upper cooling water cavity and a lower cooling water tank communicated with the upper cooling water cavity are formed in an upper body of the cylinder cover, the upper end surface of a lower body of the cylinder cover is provided with the cooling water tank corresponding to the lower cooling water tank in position, and the lower cooling water cavity is formed by the lower cooling water tank and the cooling water tank which are communicated with each other after the lower end of the upper body of the cylinder cover and the upper end of the lower body of the cylinder cover are hermetically connected; the mounting holes in the middle of the upper cylinder cover body and the lower cylinder cover body are communicated to form an oil sprayer mounting hole, and the air inlet valve guide sleeve hole and the exhaust valve guide sleeve hole are respectively corresponding to and communicated with an air inlet valve seat mounting hole and an exhaust valve seat mounting hole in the lower cylinder cover body. The utility model effectively reduces the casting and processing difficulty of the large-cylinder-diameter medium-high speed diesel engine on the cylinder cover under the coupling alternating action of mechanical load and thermal stress, so that the coupling area of the mechanical stress and the thermal stress of the cylinder cover can be independently reinforced, the production and manufacturing cost of the cylinder cover is reduced, the maintainability of the cylinder cover is increased, and the repair cost of the cylinder cover is low.
Description
Technical Field
The utility model belongs to the technical field of diesel engines, and particularly relates to a high-strength combined cylinder cover for a large-cylinder-diameter medium-high-speed diesel engine.
Background
The combustion surface of the cylinder cover is the core of the combustion chamber of the diesel engine. In the working cycle process of the diesel engine, a cylinder cover bears alternating impact of gas pressure of fuel combustion, is responsible for working medium exchange in a cylinder and also needs to transmit and discharge combustion heat in the cylinder, and repeatedly bears alternating loads of mechanical stress and thermal stress. With the further improvement of the thermal efficiency of the diesel engine, the diesel engine is required to have higher explosion pressure, and higher requirements are provided for the capability of bearing mechanical stress and thermal stress alternating load of a combustion surface of a cylinder cover. In the design process of the cylinder cover, the pressure-bearing wall thickness of the combustion surface of the cylinder cover needs to be increased, the cooling water cavity channel of the combustion surface is increased, a more efficient cooling water cavity channel is adopted, and a more expensive cylinder cover material is used, so that the casting difficulty and the production cost of the cylinder cover of the large-cylinder-diameter medium-high-speed diesel engine are increased, and therefore improvement is needed to solve the problem.
SUMMERY OF THE UTILITY MODEL
The technical problems solved by the utility model are as follows: the utility model provides a high strength combination formula cylinder cap for big cylinder footpath medium and high speed diesel engine, adopt the combination formula cylinder cap of constituteing by the cylinder cap upper part of the body and the cylinder cap lower part of the body of mutually independent structure, effectively reduce the casting and the processing degree of difficulty of big cylinder footpath medium and high speed diesel engine to the cylinder cap under mechanical load and thermal stress coupling alternating action, make the coupling region of cylinder cap mechanical stress and thermal stress can adopt more reliable intensive means alone, reduce the production manufacturing cost of cylinder cap, and simultaneously, improve the adaptability of cylinder cap, increased the cylinder cap maintainability, just can accomplish the repair work to the cylinder cap through changing the cylinder cap lower part of the body, effectively reduced the repair cost of cylinder cap.
The technical scheme adopted by the utility model is as follows: the high-strength combined cylinder cover for the large-cylinder-diameter medium-high-speed diesel engine comprises a cylinder cover upper body and a cylinder cover lower body, wherein an upper cooling water cavity and a lower cooling water tank with an opening at the lower end are formed in the cylinder cover upper body and are communicated with the upper cooling water cavity through a pore passage, a cooling water tank corresponding to the lower cooling water tank is formed on the upper end surface of the cylinder cover lower body, and the lower cooling water cavity is formed by the lower cooling water tank and the cooling water tank which are communicated with each other after the lower end of the cylinder cover upper body and the upper end of the cylinder cover lower body are connected in a sealing manner; the mounting holes in the middle of the cylinder cover upper body and the middle of the cylinder cover lower body are communicated to form an oil sprayer mounting hole, the cylinder cover upper body is provided with an air inlet valve guide sleeve hole and an air outlet valve guide sleeve hole which are distributed on the periphery of the mounting hole, and the air inlet valve guide sleeve hole and the air outlet valve guide sleeve hole correspond to and are communicated with an air inlet valve seat mounting hole and an air outlet valve seat mounting hole which are arranged on the cylinder cover lower body respectively.
The cylinder cover comprises a cylinder cover body and a cylinder cover upper body, wherein the outer circumferential wall of the upper end of the cylinder cover lower body is provided with a plurality of water inlet holes communicated with a cooling water tank, and the upper end surface of the cylinder cover upper body is provided with water outlet holes communicated with an upper cooling water cavity.
Furthermore, after the outer wall of the lower end of the cylinder cover upper body and the groove wall of the upper end of the cooling water tank, the inner wall of the upper end of the air inlet valve seat mounting hole and the hole wall periphery of the lower end of the air inlet valve guide sleeve hole and the hole wall periphery of the upper end of the air outlet valve seat mounting hole and the hole wall periphery of the lower end of the air outlet valve guide sleeve hole are matched in a spigot connection mode, a combined sealing structure of the cylinder cover upper body and the cylinder cover lower body is realized by plane contact sealing of male and female spigot ends, a sealing structure formed by a plurality of spigots and a sealing ring arranged between the side walls of the male and female spigots.
Further, the cylinder cover lower body is made of cast iron, alloy cast iron, cast steel or forged steel materials, or the exhaust nose bridge area between the combustion surface of the cylinder cover lower body and the adjacent exhaust passage is subjected to strengthening treatment.
Compared with the prior art, the utility model has the advantages that:
1. the technical scheme adopts the combined cylinder cover consisting of the cylinder cover upper body and the cylinder cover lower body which are mutually independent in structure, so that the casting and processing difficulty of the large-diameter medium-high speed diesel engine on the cylinder cover under the mechanical load and the thermal stress coupling alternating action is effectively reduced, the coupling region of the mechanical stress and the thermal stress of the cylinder cover can independently adopt a more reliable strengthening means, and the production and manufacturing cost of the cylinder cover is reduced;
2. the technical scheme is that a combined sealing structure for an upper body and a lower body of a cylinder cover is formed by plane contact sealing of male and female spigot ends, a sealing structure formed by a plurality of spigots and a sealing ring arranged between the side walls of the male and female spigots, the upper body and the lower body of the cylinder cover are reliably sealed under the action of pre-tightening force of a cylinder cover bolt after the cylinder cover and a cylinder body are fixedly connected, the sealing structure is reliable and has good sealing effect, and high-temperature gas and cooling water can be effectively isolated;
3. according to the technical scheme, the cylinder cover lower body is provided with the arrangement of cooling water cavity channels according to the cooling requirement of the combustion surface, namely the cooling water channel which corresponds to and is communicated with the lower cooling water channel at the lower end of the cylinder cover upper body is used for reducing the heat load of the combustion surface of the cylinder cover;
4. the cylinder sleeve with the combined structure shortens the processing depth of the air inlet valve guide sleeve hole, the exhaust valve guide sleeve hole and the oil sprayer mounting hole, can effectively improve the gap processing precision and reduce the processing and manufacturing difficulty;
5. this technical scheme improves the adaptability of cylinder cap, has increased cylinder cap maintainability, just can accomplish the rework to the cylinder cap through changing the cylinder cap lower part of the body, has effectively reduced the rework cost of cylinder cap.
Drawings
FIG. 1 is a cross-sectional view of a composite cylinder head according to the present invention;
fig. 2 is a schematic perspective view of the combined cylinder head according to the present invention.
Detailed Description
In the following, an embodiment of the present invention will be described in conjunction with fig. 1-2, so as to clearly and completely describe the technical solutions, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, but not all of the embodiment.
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, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
A high-strength combined cylinder cover for a large-cylinder-diameter medium-high speed diesel engine is shown in figure 1-2 and comprises a cylinder cover upper body 1 and a cylinder cover lower body 2, wherein an upper cooling water cavity 11 and a lower cooling water tank 3 with an opening at the lower end and communicated with the upper cooling water cavity 11 through a pore passage are formed in the cylinder cover upper body 1, a cooling water tank 4 corresponding to the lower cooling water tank 3 is formed on the upper end surface of the cylinder cover lower body 2, and the lower cooling water cavity is formed by the lower cooling water tank 3 and the cooling water tank 4 which are communicated with each other after the lower end of the cylinder cover upper body 1 and the upper end of the cylinder cover lower body 2 are connected in a sealing manner; the mounting holes in the middle of the cylinder cover upper body 1 and the middle of the cylinder cover lower body 2 are communicated to form an oil sprayer mounting hole 5, the cylinder cover upper body 1 is provided with an air inlet valve guide sleeve hole 8 and an air outlet valve guide sleeve hole 9 which are distributed on the periphery of the mounting hole, and the air inlet valve guide sleeve hole 8 and the air outlet valve guide sleeve hole 9 are respectively corresponding to and communicated with an air inlet valve seat mounting hole 6 and an air outlet valve seat mounting hole 7 which are arranged on the cylinder cover lower body 2; in the technical scheme, the combined cylinder cover consisting of the cylinder cover upper body 1 and the cylinder cover lower body 2 which are mutually independent in structure is adopted, so that the casting and processing difficulty of the large-diameter medium-high speed diesel engine on the cylinder cover under the mechanical load and the thermal stress coupling alternating action is effectively reduced, a more reliable strengthening means can be independently adopted in the coupling region of the mechanical stress and the thermal stress of the cylinder cover, and the production and manufacturing cost of the cylinder cover is reduced; the cylinder cover lower body 2 is designed with the arrangement of cooling water cavity channels according to the cooling requirement of the combustion surface, namely the cooling water channel which corresponds to and is communicated with the lower cooling water channel 3 at the lower end of the cylinder cover upper body 1 to form a lower cooling water cavity is used for reducing the heat load of the combustion surface of the cylinder cover;
the setting of inlet opening and outlet opening position: the outer circumferential wall of the upper end of the cylinder cover lower body 2 is provided with a plurality of water inlet holes 10 communicated with the cooling water tank 4, and the upper end surface of the cylinder cover upper body 1 is provided with water outlet holes communicated with the upper cooling water cavity 11.
Adopt labyrinth seal + plane seal + sealing washer combination seal mode to seal the junction of cylinder cap upper part of the body 1 and cylinder cap lower part of the body 2, seal structure specifically as follows: after the outer wall of the lower end of the cylinder cover upper body 1 is matched with the wall of the upper end of the cooling water tank 4, the inner wall of the upper end of the air inlet valve seat mounting hole 6 is matched with the outer periphery of the lower end of the air inlet valve guide sleeve hole 8, and the inner wall of the upper end of the air outlet valve seat mounting hole 7 is matched with the outer periphery of the lower end of the air outlet valve guide sleeve hole 9 in a spigot connection mode, a combined sealing structure of the cylinder cover upper body 1 and the cylinder cover lower body 2 is realized by male and female spigot end plane contact sealing, a sealing structure formed by a plurality of spigots and a sealing ring 12 arranged between the male and female spigot side walls; in the structure, the combined sealing structure of the cylinder cover upper body 1 and the cylinder cover lower body 2 is formed by the plane contact sealing of the male and female spigot ends, the sealing structure formed by a plurality of spigots and the sealing ring arranged between the side walls of the male and female spigots, the reliable sealing of the cylinder cover upper body 1 and the cylinder cover lower body 2 is realized under the pre-tightening force of the cylinder cover bolt after the cylinder cover and the cylinder body are fixedly connected, the sealing structure is reliable and has good sealing effect, and high-temperature gas and cooling water can be effectively isolated;
in order to increase the performance of the cylinder head lower body 2 mainly bearing the mechanical load and the thermal load area of the diesel engine, the cylinder head lower body 2 is made of cast iron, alloy cast iron, cast steel or forged steel materials, or the exhaust nose bridge area between the combustion surface of the cylinder head lower body 2 and the adjacent exhaust passage is reinforced, wherein the reinforcing treatment means is as follows: preferable heat treatment methods such as quenching and tempering; after the cylinder cover lower body 2 is optimized in material optimization, heat treatment mode and structure, the maximum explosion pressure borne by the combustion surface of the cylinder cover can reach 30.0MPa, and the maximum single-cylinder power can reach 1200 kW/cyl.
The cylinder sleeve with the combined structure shortens the processing depth of the air inlet valve guide sleeve hole 8, the exhaust valve guide sleeve hole 9 and the oil sprayer mounting hole 5, can effectively improve the gap processing precision, and reduces the processing and manufacturing difficulty; the adaptability of the cylinder cover is improved, the maintainability of the cylinder cover is increased, the repair work of the cylinder cover can be completed by replacing the lower body of the cylinder cover, and the repair cost of the cylinder cover is effectively reduced.
It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (4)
1. High strength combination formula cylinder cap for high-speed diesel engine in big cylinder diameter, its characterized in that: the cylinder cover comprises a cylinder cover upper body (1) and a cylinder cover lower body (2), wherein an upper cooling water cavity (11) and a lower cooling water tank (3) with an opening at the lower end and communicated with the upper cooling water cavity (11) through a pore channel are formed in the cylinder cover upper body (1), a cooling water tank (4) corresponding to the lower cooling water tank (3) is formed on the upper end surface of the cylinder cover lower body (2), and the lower cooling water cavity is formed by the lower cooling water tank (3) and the cooling water tank (4) which are communicated with each other after the lower end of the cylinder cover upper body (1) and the upper end of the cylinder cover lower body (2) are hermetically connected; the fuel injector is characterized in that a fuel injector mounting hole (5) is formed after mounting holes in the middle of the cylinder cover upper body (1) and the middle of the cylinder cover lower body (2) are communicated, an air inlet valve guide sleeve hole (8) and an air outlet valve guide sleeve hole (9) distributed on the periphery of the mounting hole are manufactured in the cylinder cover upper body (1), and the air inlet valve guide sleeve hole (8) and the air outlet valve guide sleeve hole (9) correspond to and are communicated with an air inlet valve seat mounting hole (6) and an air outlet valve seat mounting hole (7) arranged on the cylinder cover lower body (2) respectively.
2. The high-strength combined cylinder cover for the large-cylinder-diameter medium-high speed diesel engine according to claim 1, characterized in that: the cylinder cover is characterized in that a plurality of water inlet holes (10) communicated with the cooling water tank (4) are formed in the outer circumferential wall of the upper end of the cylinder cover lower body (2), and water outlet holes communicated with the upper cooling water cavity (11) are formed in the upper end face of the cylinder cover upper body (1).
3. The high-strength combined cylinder cover for the large-cylinder-diameter medium-high speed diesel engine according to claim 1, characterized in that: the outer wall of the lower end of the cylinder cover upper body (1) is matched with the groove wall of the upper end of the cooling water tank (4), the inner wall of the upper end of the air inlet valve seat mounting hole (6) is matched with the hole wall periphery of the lower end of the air inlet valve guide sleeve hole (8), the inner wall of the upper end of the air exhaust valve seat mounting hole (7) is matched with the hole wall periphery of the lower end of the air exhaust valve guide sleeve hole (9) in a spigot connection mode, and a combined sealing structure of the cylinder cover upper body (1) and the cylinder cover lower body (2) is realized by a sealing structure formed by plane contact of male and female spigot ends, a plurality of spigots and a sealing ring (12) arranged between the male and female spigot side walls.
4. The high-strength combined cylinder cover for the large-bore medium-high speed diesel engine according to any one of claims 1 to 3, characterized in that: the cylinder cover lower body (2) is made of cast iron, alloy cast iron, cast steel or forged steel materials, or the exhaust nose bridge area between the combustion surface of the cylinder cover lower body (2) and the adjacent exhaust passage is subjected to strengthening treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122271526.1U CN215907961U (en) | 2021-09-18 | 2021-09-18 | High-strength combined cylinder cover for large-cylinder-diameter medium-high speed diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122271526.1U CN215907961U (en) | 2021-09-18 | 2021-09-18 | High-strength combined cylinder cover for large-cylinder-diameter medium-high speed diesel engine |
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| Publication Number | Publication Date |
|---|---|
| CN215907961U true CN215907961U (en) | 2022-02-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122271526.1U Active CN215907961U (en) | 2021-09-18 | 2021-09-18 | High-strength combined cylinder cover for large-cylinder-diameter medium-high speed diesel engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215907961U (en) |
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2021
- 2021-09-18 CN CN202122271526.1U patent/CN215907961U/en active Active
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