CN216429809U - Marine diesel engine high-pressure oil pipe with high-frequency brazing conical sealing surface - Google Patents
Marine diesel engine high-pressure oil pipe with high-frequency brazing conical sealing surface Download PDFInfo
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- CN216429809U CN216429809U CN202120727004.5U CN202120727004U CN216429809U CN 216429809 U CN216429809 U CN 216429809U CN 202120727004 U CN202120727004 U CN 202120727004U CN 216429809 U CN216429809 U CN 216429809U
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Abstract
The marine diesel engine high-pressure oil pipe with the high-frequency brazing conical sealing surface comprises a high-pressure oil pipe body, conical sealing surface ferrules are arranged outside two ends of the high-pressure oil pipe body, the conical sealing surface ferrules and the high-pressure oil pipe body are in a split machining mode, the conical sealing surface ferrules are sleeved outside the ends of the high-pressure oil pipe body, the outer end faces of the conical sealing surface ferrules are aligned with the end faces of the corresponding ends of the high-pressure oil pipe body, and the conical sealing surface ferrules and the high-pressure oil pipe body are fixedly connected through a high-frequency brazing method through high-frequency brazing equipment. According to the utility model, the end conical sealing structure of the high-pressure oil pipe and the high-pressure oil pipe body are separately processed, and then the conical sealing surface ferrule is fixed on the high-pressure oil pipe by adopting a high-frequency brazing method, so that the head of a finished part can be reliably formed, the defect and crack source in the finished part are ensured, the shrinkage and deformation of an inner hole at the end part of the high-pressure oil pipe are avoided, the quality of the high-pressure oil pipe is stable and reliable, and the service life of the high-pressure oil pipe is long.
Description
Technical Field
The utility model belongs to the technical field of oil pipes, and particularly relates to a high-pressure oil pipe of a marine diesel engine with a high-frequency brazing conical sealing surface.
Background
No matter the cylinder diameter of the current domestic marine diesel engine is less than or equal to 200 or the cylinder diameter is more than 200, a high-pressure oil pipe used by a high-pressure oil pump is shown in figure 3, the material of the high-pressure oil pipe 1 'is 12CrMo, the specification is phi 10 multiplied by 3 cold-drawn seamless steel pipe, and after upsetting forming is adopted on the conical sealing surfaces 2' of the head parts at the two ends, finish machining is carried out on the conical sealing surfaces of the head parts and the inner holes phi 4 multiplied by 30 at the end surfaces away from the pier heads so as to meet the requirements of the size and the roughness. And finally, carrying out a hydraulic test (medium: fuel oil) on the finished product of the high-pressure oil pipe assembly on a hydraulic test bed, wherein the test pressure is more than or equal to 150MPa, the duration is not less than 60s, and the high-pressure oil pipe assembly cannot leak, crack or generate permanent deformation. The high-pressure oil pipe is only in a static pressure-bearing state at the moment, and the strength of the high-pressure oil pipe is enough to bear the test pressure.
When the high-pressure oil pipe 1 ' is assembled and used, two ends of the head part are respectively combined through the sealing washer 3 ' and the compression nut 4 ', the high-pressure oil pipe is fixed at an oil inlet end and an oil outlet end on different planes of a diesel engine body, the pipe body part of the high-pressure oil pipe is suspended in a three-dimensional space, in the working process of the diesel engine, the pipe body of the high-pressure oil pipe swings up and down along with alternating load vibration of the diesel engine, the root part of the oil pipe is easy to be subjected to cold work hardening, and after the high-pressure oil pipe is used for about 1000 hours, the quality accident that the joint part of the head part and the pipe body of the individual oil pipe is broken occurs. The quality analysis of the fracture part of the fractured oil pipe shows that: the inner hole is contracted and deformed when the high-pressure oil pipe is pier-headed, because the wall thickness of the pipe fitting is thin, partial wrinkles are permanently reserved at the inner hole of the head, slight clamping marks are still reserved at the surface clamping part at the joint of the pier-head part of the high-pressure oil pipe and the pipe body, and the wrinkles and the clamping marks cannot be completely removed in the subsequent machining process, so that the wrinkles and the clamping marks become crack sources which finally cause the oil pipe to be broken, as shown in fig. 4.
In order to ensure the quality stability, reliability and long service life of the high-pressure oil pipe, the head forming structure of the high-pressure oil pipe needs to be analyzed and researched, so that the head of a finished part can be reliably formed, the defect and crack source of the finished part are ensured, the fracture risk is reduced, and the machining cost is low. Improvements are therefore proposed.
SUMMERY OF THE UTILITY MODEL
The technical problems solved by the utility model are as follows: the utility model provides a marine diesel engine high-pressure oil pipe with a high-frequency brazing conical sealing surface, which is characterized in that an end conical sealing structure of the high-pressure oil pipe and a high-pressure oil pipe body are separately processed, and then a conical sealing surface ferrule is fixed on the high-pressure oil pipe by adopting a high-frequency brazing method, so that a finished part can be reliably formed at the head, the defect and crack source in the finished part are ensured, the shrinkage deformation of an inner hole at the end part of the high-pressure oil pipe is avoided, and the quality stability, reliability and long service life of the high-pressure oil pipe are ensured.
The technical scheme adopted by the utility model is as follows: the marine diesel engine high-pressure oil pipe with the high-frequency brazing conical sealing surface comprises a high-pressure oil pipe body, conical sealing surface ferrules are arranged on the outer portions of two end heads of the high-pressure oil pipe body, the conical sealing surface ferrules and the high-pressure oil pipe body are processed in a split type processing mode, the conical sealing surface ferrules are sleeved on the outer portion of the end head of the high-pressure oil pipe body, the outer end faces of the conical sealing surface ferrules are aligned to the end face of the corresponding end head of the high-pressure oil pipe body, the conical sealing surface ferrules and the high-pressure oil pipe body are fixedly connected through a high-frequency brazing method through high-frequency brazing equipment, and then the conical sealing surface ferrules are mechanically processed into conical sealing surfaces.
In order to further limit the technical scheme, the conical sealing surface ferrule is made of the same material as the high-pressure oil pipe body.
The technical scheme is further limited, when the conical sealing surface ferrule is sleeved outside the high-pressure oil pipe body, a brazing gap is reserved between the conical sealing surface ferrule and the high-pressure oil pipe body and ranges from 0.15 mm to 0.20 mm.
In order to further limit the technical scheme, when the high-frequency brazing equipment is used for high-frequency brazing, a brazing material selected is BCu58ZnMn GB/T6418, the specification is 200mm multiplied by 20mm multiplied by 0.20mm, and a welding flux is dehydrated borax.
The technical proposal is further limited, the frequency of the high-frequency brazing equipment is 30KHz, and the power is 80 KW.
The technical proposal is further limited, the outer diameter range of the high-pressure oil pipe body is phi 6.0-phi 15.0 mm.
Compared with the prior art, the utility model has the advantages that:
1. according to the scheme, the end conical sealing structure of the high-pressure oil pipe and the high-pressure oil pipe body are processed separately, and then the high-frequency brazing method is adopted to replace the original method of upsetting and forming the conical sealing surface of the oil pipe head to fix the conical sealing surface ferrule on the high-pressure oil pipe, so that the size and the strength of the head of a finished part meet the technical requirements, the head of the finished part can be reliably formed, no defect and crack source in the finished part is ensured, the end part of the high-pressure oil pipe is prevented from having inner hole shrinkage deformation, and the quality stability, the reliability and the long service life of the high-pressure oil pipe are ensured;
2. this scheme simple manufacture, reliable, the clamping of brazing is quick, convenient, reduces the risk of breaking, and the processing cost is low, and machining efficiency is high, the facilitate promotion.
Drawings
FIG. 1 is a schematic view of the molded structure of the present invention;
FIG. 2 is a schematic diagram of a tapered seal face collar of the present invention connected to a high pressure tubing body prior to upset forging;
FIG. 3 is a block diagram of a high pressure oil line in the prior art;
FIG. 4 is a schematic structural diagram of a crack source at the end of a high-pressure oil pipe in the prior art.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation. The use of the phrase "comprising one of the elements" does not exclude the presence of other like elements in the process, method, article, or apparatus that comprises the element.
Referring to fig. 1-2, embodiments of the present invention are described in detail.
The marine diesel engine high-pressure oil pipe with the high-frequency brazing conical sealing surface comprises a high-pressure oil pipe body 1, wherein the outer diameter range of the high-pressure oil pipe body 1 is phi 6.0-phi 15.0 mm. In the embodiment, the outer diameter of the high-pressure oil pipe body 1 is phi 10, and the inner diameter is phi 4. The high-pressure oil pipe comprises a high-pressure oil pipe body 1, conical sealing face ferrules 2 are arranged on the outer portions of two ends of the high-pressure oil pipe body 1, the conical sealing face ferrules 2 and the high-pressure oil pipe body 1 are in a split type machining mode, the conical sealing face ferrules 2 are sleeved on the outer portions of the ends of the high-pressure oil pipe body 1, the outer end faces of the conical sealing face ferrules are aligned with the end faces of the corresponding ends of the high-pressure oil pipe body 1, the conical sealing face ferrules 2 and the high-pressure oil pipe body 1 are fixedly connected through high-frequency brazing by high-frequency brazing equipment, and then the conical sealing face ferrules are machined to form conical sealing faces.
In further detail, the conical sealing surface ferrule 2 is made of the same material as the high-pressure oil pipe body 1.
In the embodiment, the sizes of the outer circle, the inner hole and the length of the conical sealing surface ferrule 2 are respectively phi 18 multiplied by phi 10.2 multiplied by 16, and a brazing gap of 0.15-0.20 mm is reserved between the conical sealing surface ferrule 2 and the high-pressure oil pipe body 1 when the conical sealing surface ferrule is sleeved outside the high-pressure oil pipe body. The brazing gap is too large, and the molten brazing filler metal flows out from the gap and cannot exert the brazing capillary effect; if the thickness is too small, the brazing layer becomes thin, and the tensile strength of the brazed part becomes insufficient. Therefore gap size control is important.
The brazing material selected when the high-frequency brazing equipment is used for high-frequency brazing is BCu58ZnMn GB/T6418, the specification is 200mm multiplied by 20mm multiplied by 0.20mm, the melting point of the brazing material is similar to the normalizing temperature of a high-pressure oil pipe material, the head of the oil pipe is subjected to normalizing treatment while the head of the oil pipe is brazed, and the reliability of the mechanical property of the brazing material is verified according to GB/T2652 tensile test method for welding seams and deposited metals; the welding flux is dehydrated borax. Before brazing, the metal cleaning agent is used for cleaning stains on the outer surfaces of all parts, so that the surfaces of workpieces to be welded are clean and dry.
The high-frequency brazing equipment is selected to have the frequency of 30KHz and the power of 80 KW. When in brazing, firstly, the high-pressure oil pipe body 1 penetrates through the conical sealing surface ferrule 2 and is flush with one end, as shown in figure 1, the high-pressure oil pipe body is vertically placed on a platform, and the conical sealing surface ferrule 2 and the high-pressure oil pipe body 1 are locally heated for several seconds, so that when a heating part is heated to about 850 ℃, brazing materials can be placed in a gap between the conical sealing surface ferrule 2 and the high-pressure oil pipe body, the brazing materials are heated and melted, the gap is filled through capillary action, and meanwhile, a small amount of welding flux is added for deoxidation and exhaust; immediately powering off and air cooling; and respectively installing a sealing washer and a compression nut according to the assembling direction. And (4) finishing the brazing of the other end according to the steps, and finishing the brazing of the group of high-pressure oil pipes. And then, the shape of the conical sealing surface ferrule 2 is formed by a method of upsetting the high-pressure oil pipe, and finish machining is carried out on an inner hole phi 4 multiplied by 30 away from the end surface, as shown in figure 2, so that the requirements of all sizes and roughness of the head of the oil pipe are met. In this embodiment, the high frequency device is selected because the higher the frequency of the device, the shallower the depth of the surface layer of the heated portion is, the faster the speed is, the heating time of the heating element in the air is reduced as much as possible, and the depth of the surface oxidation layer is reduced.
The size and the strength of the head of the finished part meet the technical requirements, so that the head of the finished part can be reliably formed, the defect and the crack source in the finished part are ensured, the shrinkage and deformation of an inner hole at the end part of a high-pressure oil pipe are avoided, and the quality stability, the reliability and the long service life of the high-pressure oil pipe are ensured; simple manufacture, reliability, fast and convenient brazing and clamping, high processing efficiency and convenient popularization, and reduces the requirements of fracture risk and low processing cost.
The finished product of the high-pressure oil pipe assembly is finally subjected to a hydraulic test (medium: fuel oil) on a hydraulic test bed, the test pressure is more than or equal to 150MPa, the duration is not less than 60s, and no leakage, no fracture and no permanent deformation occur.
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 (6)
1. Marine diesel engine high pressure fuel pipe with high frequency brazing toper sealed face, including high pressure fuel pipe body (1), its characterized in that: the high-pressure oil pipe is characterized in that conical sealing surface ferrules (2) are arranged outside two ends of the high-pressure oil pipe body (1), the conical sealing surface ferrules (2) and the high-pressure oil pipe body (1) are processed in a split type mode, the conical sealing surface ferrules (2) are sleeved outside the ends of the high-pressure oil pipe body (1), the outer end faces of the conical sealing surface ferrules are aligned to the end faces of the corresponding ends of the high-pressure oil pipe body (1), the conical sealing surface ferrules (2) are fixedly connected with the high-pressure oil pipe body (1) through high-frequency brazing by a high-frequency brazing device, and the conical sealing surface ferrules (2) are mechanically processed into conical sealing surfaces.
2. The marine diesel engine high pressure fuel pipe with high frequency brazed conical sealing surfaces according to claim 1, characterized in that: the conical sealing surface ferrule (2) is made of the same material as the high-pressure oil pipe body (1).
3. The marine diesel engine high pressure fuel pipe with high frequency brazed conical sealing surfaces according to claim 1, characterized in that: when the conical sealing surface ferrule (2) is sleeved outside the high-pressure oil pipe body (1), a brazing gap of 0.15-0.20 mm is reserved between the conical sealing surface ferrule and the high-pressure oil pipe body.
4. The marine diesel engine high pressure fuel pipe with high frequency brazed conical sealing surfaces according to claim 1, characterized in that: the brazing material selected by the high-frequency brazing equipment during high-frequency brazing is BCu58ZnMn GB/T6418, the specification is 200mm multiplied by 20mm multiplied by 0.20mm, and the welding flux is dehydrated borax.
5. The marine diesel engine high pressure fuel pipe with high frequency brazed conical sealing surfaces according to claim 1, characterized in that: the high-frequency brazing equipment is selected to have the frequency of 30KHz and the power of 80 KW.
6. The marine diesel engine high pressure fuel pipe with high frequency brazed conical sealing surfaces according to claim 1, characterized in that: the outer diameter range of the high-pressure oil pipe body (1) is phi 6.0-phi 15.0 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120727004.5U CN216429809U (en) | 2021-04-11 | 2021-04-11 | Marine diesel engine high-pressure oil pipe with high-frequency brazing conical sealing surface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120727004.5U CN216429809U (en) | 2021-04-11 | 2021-04-11 | Marine diesel engine high-pressure oil pipe with high-frequency brazing conical sealing surface |
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| Publication Number | Publication Date |
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| CN216429809U true CN216429809U (en) | 2022-05-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120727004.5U Active CN216429809U (en) | 2021-04-11 | 2021-04-11 | Marine diesel engine high-pressure oil pipe with high-frequency brazing conical sealing surface |
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| CN (1) | CN216429809U (en) |
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2021
- 2021-04-11 CN CN202120727004.5U patent/CN216429809U/en active Active
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