CN216665773U - Piston assembly for emergency diesel engine - Google Patents
Piston assembly for emergency diesel engine Download PDFInfo
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- CN216665773U CN216665773U CN202122504801.XU CN202122504801U CN216665773U CN 216665773 U CN216665773 U CN 216665773U CN 202122504801 U CN202122504801 U CN 202122504801U CN 216665773 U CN216665773 U CN 216665773U
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- ring
- piston
- mounting groove
- lubricating
- pressure ring
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
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- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
The utility model discloses a piston assembly for an emergency diesel engine, which comprises a piston and a piston ring arranged on the piston, wherein the piston ring comprises a top ring, a first pressure ring, a second pressure ring and an oil ring which are sequentially arranged on the piston, at least one of the top ring, the first pressure ring and the second pressure ring is provided with at least one circle of mounting groove with an opening facing the wall of the diesel engine cylinder, an annular lubricating piece is mounted in the mounting groove, the edge of the lubricating piece exceeds the edge of the mounting groove to form a protruding part, and after the lubricating piece is assembled with the cylinder, the lubricating piece is compressed and retracted and is matched with the piston ring to slide and abut against the wall of the cylinder; at least one of the top ring, the first pressure ring and the second pressure ring is provided with at least one circle of mounting groove with an opening facing the cylinder wall of the diesel engine, and the mounting groove is provided with the lubricating piece, so that the lubricating performance between the piston ring and the cylinder wall is improved, the problem of cylinder pulling when the flow of lubricating oil is insufficient is avoided, the friction work consumption is reduced, and the service life is prolonged.
Description
Technical Field
The utility model relates to the field of nuclear power, in particular to a piston assembly for an emergency diesel engine of a nuclear power plant.
Background
The piston of an emergency diesel engine is provided with at least one piston ring which can perform various functions, such as guiding the piston in the cylinder, distributing and/or scraping lubricant on the cylinder wall of the cylinder, sealing the combustion chamber against the crankcase, etc., and which are subjected to heavy loads in the operating state, so that the piston rings are in direct frictional contact with the contact surface of the cylinder (i.e. the cylinder wall) and the combustion pressure needs to be borne by them. The emergency diesel engine is used as a main guarantee measure of an emergency power supply of a nuclear power plant, and the usability of the emergency diesel engine needs to be guaranteed through regular tests, so that the emergency diesel engine of the nuclear power plant is frequently in a hot standby state, but due to the fact that the shutdown time is too long and no lubricating oil is supplied in a crankshaft, sufficient lubrication is not provided between a piston ring and a cylinder wall of the emergency diesel engine, when the emergency diesel engine is started in an emergency, the problem of cylinder scuffing between the piston ring and the cylinder wall is easily caused, and the cylinder scuffing refers to the fact that the inner wall of a cylinder is pulled to be deep grooves, and the tightness is lost when the piston, the piston ring and the cylinder wall rub, so that the compression pressure of the cylinder is reduced, and the dynamic property is lost.
At present, the piston assembly of the emergency diesel engine has 4 piston rings which are respectively a top ring, two pressure rings and an oil ring from top to bottom, wherein the oil ring mainly plays a role in oil scraping and distributing and lubricating oil is promoted to be distributed on the cylinder wall. However, the emergency diesel engine has long shutdown time and short startup time, and generally reaches rated rotation speed and rated power within 10s, so that abnormal wear between a piston ring and a cylinder wall is caused, particularly a top ring, the top ring is a piston ring arranged in a combustion chamber closest to a cylinder, and the top ring bears the largest load, so that cylinder scuffing is easily caused.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that in order to overcome the defects of the prior art, the piston assembly for the emergency diesel engine is provided, the piston ring and the cylinder wall have good lubricating capacity, the cylinder pulling phenomenon is reduced, and the service life of the emergency diesel engine is prolonged.
The technical scheme adopted by the utility model for solving the technical problems is as follows: a piston assembly for an emergency diesel engine comprises a piston and a piston ring arranged on the piston, wherein the piston ring comprises a top ring, a first pressure ring, a second pressure ring and an oil ring which are sequentially arranged on the piston, at least one of the top ring, the first pressure ring and the second pressure ring is provided with at least one circle of mounting groove with an opening facing the cylinder wall of the diesel engine, an annular lubricating piece is mounted in the mounting groove, the edge of the lubricating piece exceeds the edge of the mounting groove to form a protruding part, and after the lubricating piece is assembled with the cylinder, the lubricating piece is compressed and retracted and is matched with the piston ring to slide and abut against the cylinder wall.
Further, preferably, the lubricating member is an expandable material member, and the surface of the extending part of the lubricating member is smoothly matched with the cylinder wall in a sliding way.
Preferably, the top ring, the first pressure ring and the second pressure ring are provided with mounting grooves, and each mounting groove is internally provided with the lubricating piece.
Preferably, the top ring is provided with two mounting grooves, the first pressure ring and the second pressure ring are both provided with one mounting groove, and the lubricating piece is mounted in each mounting groove.
Further, it is preferable that a contact surface of the oil ring with the cylinder wall has a curved surface structure.
Further, preferably, a contact surface of the protruding portion of the lubricating member with the cylinder wall has a curved surface structure.
Further, preferably, a contact surface of the protruding portion of the lubricating member with the cylinder wall is a planar structure.
Further, it is preferable that a sectional shape of the lubricating member is matched with a sectional shape of the mounting groove.
The utility model has the following beneficial effects: the utility model provides a piston assembly for an emergency diesel engine, which comprises a piston and a piston ring arranged on the piston, wherein the piston ring comprises a top ring, a first pressure ring, a second pressure ring and an oil ring which are sequentially arranged on the piston, at least one of the top ring, the first pressure ring and the second pressure ring is provided with at least one circle of mounting groove with an opening facing the wall of a cylinder of the diesel engine, an annular lubricating piece is arranged in the mounting groove, the edge of the lubricating piece exceeds the edge of the mounting groove to form a protruding part, and after the lubricating piece is assembled with the cylinder, the lubricating piece is compressed and retracted and is matched with the piston ring to slide and abut against the wall of the cylinder; at least one of the top ring, the first pressure ring and the second pressure ring is provided with at least one circle of mounting groove with an opening facing the cylinder wall of the diesel engine, and the mounting groove is provided with the lubricating piece, so that the lubricating performance between the piston ring and the cylinder wall is improved, the problem of cylinder pulling when the flow of lubricating oil is insufficient is avoided, and the friction work consumption is reduced.
Drawings
The utility model will be further described with reference to the following drawings and examples, in which:
FIG. 1 is a cross-sectional view of a first embodiment of a piston assembly of the present invention;
FIG. 2 is a cross-sectional view of a second embodiment of the piston assembly of the present invention;
FIG. 3 is a cross-sectional view of a first embodiment of the top ring of the present invention;
FIG. 4 is a cross-sectional view of a second embodiment of the top ring of the present invention;
FIG. 5 is a sectional view of a third embodiment of the top ring of the present invention;
FIG. 6 is a cross-sectional view of a fourth embodiment of the top ring of the present invention;
FIG. 7 is a cross-sectional view of a first embodiment of a first pressure ring of the present invention;
FIG. 8 is a cross-sectional view of a second embodiment of the first pressure ring of the present invention;
FIG. 9 is a cross-sectional view of a first embodiment of a second pressure ring of the present invention;
FIG. 10 is a cross-sectional view of a second embodiment of a second pressure ring of the present invention;
FIG. 11 is a cross-sectional view of an oil ring in the present invention.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
An element is said to be "secured to" or "disposed on" another element, either directly or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly or indirectly connected to the other element.
The terms "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positions based on the orientations or positions shown in the drawings, and are for convenience of description only and not to be construed as limiting the technical solution. The terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features. The meaning of "plurality" is two or more unless specifically limited otherwise.
As shown in fig. 1 to 11, a piston assembly for an emergency diesel engine includes a piston 20 and a piston ring disposed on the piston 20, where the piston ring includes a top ring 1, a first pressure ring 2, a second pressure ring 3 and an oil ring 4 sequentially disposed on the piston 20, at least one of the top ring 1, the first pressure ring 2 and the second pressure ring 3 is provided with at least one circle of mounting groove 5 with an opening facing a cylinder wall 10 of the diesel engine, as shown in fig. 3 to 10, the top ring 1 may be provided with the mounting groove 5, the first pressure ring 2 may be provided with the mounting groove 5, the second pressure ring 3 may be provided with the mounting groove 5, and the top ring 1, the first pressure ring 2 and the second pressure ring 3 may be provided with the mounting groove 5; only one or a plurality of mounting grooves 5 can be formed, an annular lubricating piece 6 is mounted in each mounting groove 5, the edge of each lubricating piece 6 exceeds the edge of each mounting groove 5 to form a protruding part 61, after the lubricating pieces 6 are assembled with the cylinder, the lubricating pieces 6 are compressed and retracted and are matched with piston rings to slide and abut against the cylinder wall 10, it can be understood that the lubricating pieces 6 are compressed and retracted into the mounting grooves 5, the outermost ends of the protruding parts 61 of the lubricating pieces 6 and the notches of the mounting grooves 5 are positioned on the same plane, the protruding parts 61 of the lubricating pieces 6 and the piston rings abut against the cylinder wall 10 together, the piston rings seal the piston 20 and the cylinder wall 10, and the sealing performance and the lubricating performance of the piston 20 and the cylinder wall 10 are improved by the lubricating pieces 6; at least one of the top ring 1, the first pressure ring 2 and the second pressure ring 3 is provided with at least one circle of mounting groove 5 with an opening facing the cylinder wall 10 of the diesel engine, the mounting groove 5 is provided with the lubricating piece 6, the lubricating performance between the piston ring and the cylinder wall 10 is improved, the problem of cylinder pulling when the flow of lubricating oil is insufficient is avoided, the friction work consumption is reduced, and the service life of the emergency diesel engine is prolonged.
The lubricating piece 6 can be made of graphite which has excellent high temperature resistance and lubricity, the melting point of the graphite is as high as 3850 +/-50 ℃, even if the graphite is burnt by high-temperature electric arc, the loss of weight is small, the thermal expansion coefficient is small, the strength of the graphite is enhanced along with the increase of temperature, and the strength of the graphite is doubled at 2000 ℃.
When the extension 61 of the lubricating element 6 is worn for a long time, which will affect the sealing and sliding properties between the piston ring and the cylinder wall 10, the expandable material can be made into the lubricating element 6, the surface of the extension 61 is smooth to slide with the cylinder wall 10, for example, the expandable graphite is made into the lubricating element 6, the expandable graphite has the excellent properties of natural graphite such as cold resistance, corrosion resistance, self-lubrication, etc., and also has the properties of softness, compression resilience, adsorptivity, ecological environment compatibility, biocompatibility, radiation resistance, etc. which are not possessed by natural graphite, the expandable graphite can expand in volume instantly when meeting high temperature, so that the structure is loose, porous and curved, the surface area is enlarged, the surface energy is improved, the adsorption scale graphite force is enhanced, and the vermicular graphite can be embedded by itself, thus increasing the softness, resilience and plasticity, the expandable material is used for expanding when the extending part 61 of the lubricating element 6 is damaged, the lubricating element 6 can expand when meeting high temperature to form a new extending part 61, so that the new extending part continues to abut against the cylinder wall 10, and the extending part 61 with a smooth surface is in sliding fit with the cylinder wall 10, so that the lubricating performance and the sealing performance between the piston ring and the cylinder wall 10 are improved.
In the present embodiment, as shown in fig. 3-4 and 7-10, the top ring 1, the first pressure ring 2, and the second pressure ring 3 are respectively provided with one mounting groove 5, and each mounting groove 5 is internally provided with a lubricating piece 6, so as to increase the lubricity between the piston ring and the cylinder wall 10, reduce the friction loss of the oil ring 4, the first pressure ring 2, and the second pressure ring 3, and prolong the service life of the oil ring 4, the first pressure ring 2, and the second pressure ring 3.
In the present embodiment, the top ring 1 is a piston ring disposed closest to a combustion chamber of a cylinder, the top ring 1 bears a maximum load, and the first pressure ring 2 and the second pressure ring 3 under the top ring 1 bear a load much smaller than the load borne by the top ring 1, so as to better protect the top ring 1 and enable the top ring 1 and the cylinder wall 10 to have a better lubricating function, as shown in fig. 5 to 6, the top ring 1 is provided with two mounting grooves 5, as shown in fig. 7 to 10, the first pressure ring 2 and the second pressure ring 3 are both provided with one mounting groove 5, and each mounting groove 5 is provided with a lubricating piece 6.
The oil ring 4 is used for distributing lubricating oil to the cylinder wall 10 to increase the lubricating performance between the piston ring and the cylinder wall 10, as shown in fig. 1-2, the contact surface of the oil ring 4 contacting the cylinder wall 10 is designed to be a curved surface structure, that is, the contact surface of the oil ring 4 and the cylinder wall 10 is a curved surface, and the two are in line contact, so that the contact pressure is ensured, the elasticity of the oil ring 4 is reduced, and the friction power consumption is further reduced.
As shown in fig. 1, 3, 6, 7, and 9, the contact surface of the protruding portion 61 of the lubricating member 6 contacting the cylinder wall 10 is a curved surface structure, that is, the contact surface of the lubricating member 6 contacting the cylinder wall 10 is a curved surface, and the two are in line contact, at this time, the contact surface between the annular lubricating member 6 and the cylinder wall 10 is small, and the required elastic force is small, so that the contact pressure between the annular lubricating member 6 and the cylinder wall 10 can be ensured, and the friction power consumption can be reduced, but it should be noted that the problem of slightly poor sealing effect can be avoided, the protruding portion 61 with different curvature can be provided according to actual needs, and the contact area between the annular lubricating member 6 and the cylinder wall 10 can be adjusted by adjusting the curvature.
As shown in fig. 2, 4, 5, 8 and 10, the contact surface of the protruding portion 61 of the lubricating member 6 with the cylinder wall 10 is a planar structure, that is, the contact surface of the lubricating member 6 with the cylinder wall 10 is a plane, and the two are in surface contact, at this time, the contact surface between the annular lubricating member 6 and the cylinder wall 10 is large, and the required contact pressure is large, so that good contact between the annular lubricating member 6 and the cylinder wall 10 can be ensured, at this time, the lubricating area is large, so that the lubricity between the piston ring and the cylinder wall 10 can be improved, and a good sealing effect can be brought, and the problems such as gas leakage can be prevented.
The cross sectional shape of lubrication piece 6 and the cross sectional shape of mounting groove 5 cooperate, make the installation that lubrication piece 6 can be fine be fixed in mounting groove 5, avoid emergent diesel engine during operation, lubrication piece 6 rocks along with piston 20's reciprocating motion and drops to influence emergent diesel engine's normal work.
Claims (8)
1. The piston assembly for the emergency diesel engine comprises a piston (20) and piston rings arranged on the piston (20), wherein the piston rings comprise a top ring (1), a first pressure ring (2), a second pressure ring (3) and an oil ring (4) which are sequentially arranged on the piston (20), and is characterized in that at least one of the top ring (1), the first pressure ring (2) and the second pressure ring (3) is provided with at least one mounting groove (5) with a circle of opening facing a cylinder wall (10) of the diesel engine, an annular lubricating piece (6) is mounted in the mounting groove (5), the edge of the lubricating piece (6) exceeds the edge of the mounting groove (5) to form a protruding part (61), and after the lubricating piece is assembled with the cylinder, the lubricating piece (6) is compressed and matched with the piston rings to be in sliding and abutted against the cylinder wall (10).
2. Piston assembly according to claim 1, characterized in that the lubricant (6) is an expandable material with a smooth surface of its protruding part (61) in sliding engagement with the cylinder wall (10).
3. The piston assembly according to claim 1, characterized in that the top ring (1), the first pressure ring (2) and the second pressure ring (3) are provided with a mounting groove (5), and each mounting groove (5) is provided with the lubricating piece (6).
4. The piston assembly according to claim 1, characterized in that the top ring (1) is provided with two mounting grooves (5), the first pressure ring (2) and the second pressure ring (3) are provided with one mounting groove (5), and each mounting groove (5) is provided with the lubricating piece (6).
5. Piston assembly according to claim 1, characterized in that the contact surface of the oil ring (4) in contact with the cylinder wall (10) is of curved configuration.
6. Piston assembly according to claim 1, characterized in that the contact surface of the protruding part (61) of the lubricant (6) with the cylinder wall (10) is of curved configuration.
7. Piston assembly according to claim 1, characterized in that the contact surface of the protrusion (61) of the lubricant (6) with the cylinder wall (10) is of planar construction.
8. Piston assembly according to claim 1, characterized in that the cross-sectional shape of the lubricant (6) matches the cross-sectional shape of the mounting groove (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122504801.XU CN216665773U (en) | 2021-10-18 | 2021-10-18 | Piston assembly for emergency diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122504801.XU CN216665773U (en) | 2021-10-18 | 2021-10-18 | Piston assembly for emergency diesel engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216665773U true CN216665773U (en) | 2022-06-03 |
Family
ID=81765134
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122504801.XU Active CN216665773U (en) | 2021-10-18 | 2021-10-18 | Piston assembly for emergency diesel engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216665773U (en) |
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2021
- 2021-10-18 CN CN202122504801.XU patent/CN216665773U/en active Active
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