CN217440199U - Ultrahigh pressure test tool for high-pressure oil pipe assembly of marine diesel engine - Google Patents
Ultrahigh pressure test tool for high-pressure oil pipe assembly of marine diesel engine Download PDFInfo
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- CN217440199U CN217440199U CN202220844774.2U CN202220844774U CN217440199U CN 217440199 U CN217440199 U CN 217440199U CN 202220844774 U CN202220844774 U CN 202220844774U CN 217440199 U CN217440199 U CN 217440199U
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Abstract
The utility model discloses a marine diesel high pressure fuel pipe subassembly superhigh pressure test frock, including the bottom plate, go up the connecting seat, lower connecting seat, a pair of screw in clamping ring and a pair of pipe union nut, go up the connecting seat and fix on bottom plate one corner, horizontal connecting post inserts to be fixed in the upper end of last connecting seat. The lower connecting seat is fixed on the other corner of the bottom plate, and the relative positions of the end head of the flange connecting column of the lower connecting seat and the end head of the horizontal connecting column are matched with the spatial positions of the two ends of the high-pressure oil pipe assembly. The screwing-in pressing rings are screwed on two ends of the high-pressure oil pipe assembly respectively, one end of the pipe joint nut is screwed on the end head of the horizontal connecting column and the end head of the flange connecting column respectively, and two ends of the high-pressure oil pipe assembly penetrate through the pipe joint nut respectively and abut against the end head of the flange connecting column and the end head of the horizontal connecting column. The utility model discloses convenient to use is swift, has solved the experimental difficult problem of high pressure oil pipe subassembly superhigh pressure, still can be used to inspect whether the high pressure oil pipe subassembly both ends spatial position size meets the requirements simultaneously, has enlarged application range.
Description
Technical Field
The utility model relates to a carry pressure test device of fuel pipe fitting, especially relate to an ultra-high pressure test device that is used for high pressure fuel pipe subassembly of marine diesel engine, belong to fluid test technical field.
Background
The ultrahigh pressure test of the high-pressure oil pipe assembly refers to a pressure test with the pipeline test pressure of more than 100Mpa, and the axis of the high-pressure oil pipe assembly 100 of a certain marine diesel engine is a space curve which is bent twice as shown in fig. 1 and fig. 2. The high-pressure oil pipe assembly 100 is of a three-layer composite structure, the inner layer of the high-pressure oil pipe assembly is a seamless steel pipe 101 made of low alloy steel with the outer diameter phi of 14mm and the inner diameter phi of 4mm, two ends of the seamless steel pipe 101 are respectively provided with a conical head 105 with a conical angle alpha = 59-1 degrees, and two ends of the seamless steel pipe 101 are respectively provided with a stud 104 used for connecting an oil injection pump and an oil injector. The outer layer of the high-pressure oil pipe assembly 100 is a sheath pipe 102 made of high-quality low-carbon steel, the length of the sheath pipe 102 is smaller than that of the seamless steel pipe 101, and opening liner pipes 103 made of high-quality low-carbon steel are respectively embedded between the two ends of the sheath pipe 102 and the seamless steel pipe 101. The studs 104 at the two ends of the high-pressure fuel pipe assembly 100 are respectively used for connecting a fuel injection pump and a fuel injector so as to deliver high-pressure fuel to the cylinder of the marine diesel engine. When a piston of the marine diesel engine approaches a top dead center, the fuel injector sprays diesel oil to a combustion chamber of the cylinder at ultrahigh pressure in a very short time, the fine granular diesel oil is mixed with high-temperature and high-pressure air in the cylinder, and after ignition and explosion, the gas is rapidly expanded to push the piston to do work downwards. The high pressure fuel line assembly 100 operates at 160Mpa of pressure and no fuel leakage occurs. According to the relevant requirements of the marine diesel engine test regulation, the test pressure of the high-pressure oil pipe assembly 100 reaches 240 MPa. The existing pressure experiment device for the high-pressure oil pipe assembly is complex in structure and high in manufacturing cost, the high-pressure oil pipe assembly is complicated and inconvenient to connect with the high-pressure oil pipe assembly, leakage is easy to occur, and the 240Mpa ultrahigh-pressure experiment of the high-pressure oil pipe assembly is difficult to complete.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a marine diesel engine high pressure fuel pipe subassembly superhigh pressure test frock solves the experimental difficult problem of high pressure fuel pipe subassembly superhigh pressure.
The utility model discloses a following technical scheme realizes:
the ultrahigh pressure test tool for the high-pressure oil pipe assembly of the marine diesel engine comprises a bottom plate, an upper connecting seat, a lower connecting seat, a pair of screwing-in pressing rings and a pair of pipe joint nuts, wherein the upper connecting seat is in an inverted T shape and comprises an integrated mounting transverse plate, a vertical seat body and a horizontal connecting column, and two ends of the mounting transverse plate are respectively fixed on one corner of the bottom plate through connecting screws and are positioned through a pair of positioning pins; the vertical base body extends upwards and vertically from the center of the installation transverse plate, the horizontal connecting column is inserted into the upper end of the vertical base body and is axially positioned by the end face shaft shoulder of the horizontal connecting column, and the horizontal connecting column is fixed in the upper end of the vertical base body through a conical end fastening screw; the lower connecting seat is of a flange structure, and the flange is fixed on the other corner of the bottom plate through a plurality of connecting screws and is positioned through a pair of positioning pins; a flange connecting column vertically extends upwards from the center of the flange, the flange connecting column is adjacent to the horizontal connecting column, the end of the flange connecting column is the same as the end of the horizontal connecting column in structure, and the relative positions of the end of the flange connecting column and the end of the horizontal connecting column are matched with the spatial positions of two ends of the high-pressure oil pipe assembly; the screwing-in pressing rings are screwed on two ends of the high-pressure oil pipe assembly respectively, the pipe joint nut penetrates through end heads of two ends of the high-pressure oil pipe assembly respectively, the middle part of an inner hole of the pipe joint nut is abutted against one end of the screwing-in pressing ring, and one end of the pipe joint nut is screwed on the end head of the flange connecting column and the end head of the horizontal connecting column respectively; conical heads at two ends of the high-pressure oil pipe assembly respectively abut against the end head of the flange connecting column and the end head of the horizontal connecting column, so that two ends of the high-pressure oil pipe assembly are respectively fixedly connected with the upper connecting seat and the lower connecting seat in a radially sealed manner; an axial through hole is formed in the center of the horizontal connecting column, a threaded hole connected with an output port of the high-pressure pump is formed in one end of the axial through hole, and a counter bore is formed in the center of the end head of the flange connecting column.
The object of the invention is further achieved by the following technical measures.
Furthermore, the upper end of a counter bore in the center of the end head of the flange connecting column is a conical counter bore, the other end of an axial through hole in the end head of the horizontal connecting column is a conical through hole, and conical heads at two ends of the high-pressure oil pipe assembly respectively abut against the conical counter bore in the end head of the flange connecting column and the conical through hole in the end head of the horizontal connecting column; the middle part of the inner hole of the pipe joint nut is also provided with a pipe joint nut taper hole, the pipe joint nut taper hole is respectively propped against the corresponding pressing ring taper head screwed in one end of the pressing ring, the pipe joint nut taper hole is respectively propped against the corresponding taper surface of the pressing ring taper head screwed in one end of the pressing ring, the taper angles of the taper counter bore, the taper through hole and the pipe joint nut taper hole are both 60 degrees, and the taper angles are matched with the taper angles alpha of the taper heads at the two ends of the high-pressure oil pipe assembly.
Furthermore, the end face of the pressing ring conical head at one end of the screw-in pressing ring is provided with a cross groove, the other end of the screw-in pressing ring is a screw-in pressing ring threaded hole screwed on the end of the high-pressure oil pipe assembly, and the screwing direction of the screw thread of the screw-in pressing ring threaded hole is opposite to that of the screw thread of the pipe joint nut.
Furthermore, an O-shaped sealing ring is arranged between the other end of the pipe joint nut and the outer peripheral surface of the protective sleeve of the high-pressure oil pipe assembly.
Furthermore, the pipe joint nut and the screwing pressing ring are respectively made of alloy structural steel, and the grade of the alloy structural steel is 35 CrMo. The heat treatment hardness of the pipe joint nut and the heat treatment hardness of the screwed pressing ring are HB 260-300.
The utility model discloses a horizontal connector post is the same with flange joint post structure, and relative position between them matches with the spatial position at high pressure fuel pipe subassembly both ends, the conical head at high pressure fuel pipe subassembly both ends that screw in clamping ring and pipe joint nut will be tried on is connected into an organic whole with flange joint post and horizontal connector post mode fixed connection who passes through threaded connection respectively, between the conical head of high pressure fuel pipe subassembly and the horizontal connector post toper through-hole of last connecting seat or the conical hole of the flange joint post of connecting seat down, and seal through the mode that the conical surface offseted between the clamping ring conical head of pipe joint nut conical hole and screw in clamping ring one end respectively. After the pipe joint nut is screwed, the pipe joint nut respectively increases the pressure of the conical heads at the two ends of the high-pressure oil pipe assembly against the corresponding conical surfaces of the upper connecting seat or the lower connecting seat through the corresponding screw-in pressing rings, and the elastic deformation generated after the conical heads at the two ends of the screw-in pressing rings, the conical heads at the two ends of the high-pressure oil pipe assembly, the conical through holes of the horizontal connecting columns or the conical holes of the flange connecting columns of the lower connecting seats are pressed respectively ensures good contact of the high-pressure oil pipe assembly with the corresponding conical surfaces of the upper connecting seat or the lower connecting seats, so that the sealing performance of the high-pressure oil pipe assembly with the horizontal connecting columns and the flange connecting columns is remarkably improved. The pipe joint nut is unscrewed, the elastic deformation of each part disappears, and the high-pressure oil pipe assembly can be conveniently dismounted. The utility model discloses convenient to use is swift, has solved the experimental difficult problem of high pressure fuel pipe subassembly 240Mpa superhigh pressure. Because the utility model discloses a relative position of flange spliced pole end and horizontal spliced pole end matches with the high pressure fuel pipe subassembly both ends spatial position of standard, consequently the utility model discloses still can be used to inspect whether meet the requirements of high pressure fuel pipe subassembly both ends spatial position size simultaneously, if the cone of high pressure fuel pipe subassembly can't realize through screw in clamping ring and pipe connector nut with the utility model discloses a horizontal spliced pole or the connection of flange spliced pole end, then show that the space at high pressure fuel pipe subassembly both ends is not conform to the requirement to enlarged the utility model discloses an application range.
The advantages and features of the invention will be illustrated and explained by the following non-restrictive description of preferred embodiments, which are given by way of example only with reference to the accompanying drawings.
Drawings
FIG. 1 is a front view of a high pressure tube assembly;
FIG. 2 is a top view of FIG. 1;
fig. 3 is a front view of the present invention;
FIG. 4 is a cross-sectional view A-A of FIG. 3;
fig. 5 is an enlarged plan view of the screw-in pressing ring.
Detailed Description
The present invention will be further explained with reference to the drawings and examples.
As shown in fig. 3 and 4, the utility model discloses a bottom plate 1, go up connecting seat 2, lower connecting seat 3, a pair of screw in clamping ring 4 and a pair of union nut 5, go up connecting seat 2 and be the shape of falling T, including the installation diaphragm 21 and the perpendicular pedestal 22 of integration, installation diaphragm 21 both ends are fixed respectively through connecting screw 24 on the lower left corner of bottom plate 1 shown in fig. 4 to fix a position through a pair of locating pin 25. The vertical base 22 extends vertically upwards from the center of the installation cross plate 21, the horizontal connecting column 23 is horizontally inserted into the upper end of the vertical base 22 and is axially positioned by the end face shoulder 231 of the horizontal connecting column 23, and the horizontal connecting column 23 is fixed in the upper end of the vertical base 22 by a cone end set screw 25.
The lower connecting seat 3 is of a flange structure, and a flange 31 is fixed on the upper right corner of the bottom plate 1 through 4 connecting screws 24 and is positioned through a pair of positioning pins 25. Flange 31 center upwards extends flange joint post 32 perpendicularly, and flange joint post 32 is adjacent with horizontal connection post 23, and flange joint post 32 end is the same with the 23 end structure of horizontal connection post, and the relative position of flange joint post 32 end and horizontal connection post 23 end matches with the spatial position of the conical head 105 at high pressure fuel pipe subassembly 100 both ends, the conical head 105 at the high pressure fuel pipe subassembly 100 both ends of being convenient for respectively with the utility model discloses a fixed connection of horizontal connection post 23 and flange joint post 32 end.
The screwing-in pressing rings 4 are respectively screwed on the studs 104 at two ends of the high-pressure oil pipe assembly 100, as shown in fig. 5, cross grooves 42 are arranged on the end surfaces of the pressing ring conical heads 41 at one ends of the screwing-in pressing rings 4, screwing-in pressing ring threaded holes 43 screwed at the ends of the high-pressure oil pipe assembly 100 are arranged at the other ends of the screwing-in pressing rings 4, and the screwing direction of the screwing-in pressing ring threaded holes 43 is opposite to that of the threads of the pipe joint nut 5. The structure of cross recess 42 makes clamping ring cone 41 produce elastic deformation easily when pressurized, promoted high pressure fuel pipe subassembly 100 both ends cone 105 with the utility model discloses a sealed effect of flange joint post 32 end and horizontal joint post 23 end, the 240 Mpa's of the high pressure fuel pipe subassembly 100 of being convenient for ultrahigh pressure test.
The union nut 5 respectively passes through the two end heads of the high-pressure oil pipe assembly 100, and the screwed pressing ring 4 is positioned in the middle of the inner hole 51 of the union nut. One end of the pipe joint nut 5 is screwed on the end head of the flange connecting column 32 and the end head 23 of the horizontal connecting column respectively, and the taper hole 511 in the middle of the inner hole 51 of the pipe joint nut abuts against the pressing ring taper head 41 screwed in one end of the pressing ring 4. When the union nut 5 is tightened, the tapered holes 511 of the union nut 5 abutting against each other drive the pressing ring tapered head 41 to rotate, the thread screwed into the pressing ring threaded hole 43 of the embodiment is a left-handed thread, the thread turning direction of the union nut 5 is a right-handed thread, and the thread turning directions of the two are opposite. Therefore, the movement directions of the union nut 5 and the pressing ring conical head 41 are opposite, so that the conical surfaces of the conical hole 511 and the pressing ring conical head 41 are tightly abutted, and the sealing effect of the connection of the end of the high-pressure oil pipe assembly 100 with the horizontal connecting column 23 and the flange connecting column 32 is effectively improved.
The upper end of a counter bore 321 in the center of the end of the flange connecting column 32 is a conical counter bore 322, the other end of an axial through hole 232 in the end of the horizontal connecting column 23 is a conical through hole 234, and conical heads 105 at two ends of the high-pressure oil pipe assembly 100 respectively abut against the conical counter bore 322 in the end of the flange connecting column 32 and the conical through hole 234 in the end of the horizontal connecting column 23.
The middle part of the inner hole 51 of the pipe joint nut is also provided with a conical hole 511 of the pipe joint nut, the conical holes 511 of the pipe joint nut are respectively abutted against the corresponding conical surfaces of the conical heads 41 of the pressing rings screwed into one end of the pressing ring 4, the conical angles of the conical counter bore 322, the conical through hole 234 and the conical hole 511 of the pipe joint nut are both 60 degrees, the conical angles are matched with the conical angle alpha of the conical heads 105 at the two ends of the high-pressure oil pipe assembly 100, and the sealing effect of the two ends of the high-pressure oil pipe assembly 100, the end of the flange connecting column 32 and the end of the horizontal connecting column 23 is improved.
An O-shaped sealing ring 6 is arranged between the other end of the pipe joint nut 5 and the outer peripheral surface of the protective sleeve 102 of the high-pressure oil pipe assembly 100 and is used for preventing leakage oil from overflowing during an ultrahigh-pressure test of the high-pressure oil pipe assembly 100.
The screwing pressing ring 4 and the pipe joint nut 5 are respectively made of alloy structural steel, and the grade of the alloy structural steel is 35 CrMo. The heat treatment hardness of the screwing pressing ring 4 and the pipe joint nut 5 is HB 260-300, and the elastic deformation effect of the screwing pressing ring 4 and the pipe joint nut 5 is improved.
Use the utility model discloses high pressure fuel pipe subassembly 100 carries out 240Mpa superhigh pressure test's process as follows:
1. firstly, respectively sleeving the pipe joint nuts 5 on two ends of the high-pressure oil pipe assembly 100, then respectively screwing the screwed pressing rings 4 on the studs 105 at two ends of the high-pressure oil pipe assembly 100, and respectively pushing the conical heads 105 at two ends of the high-pressure oil pipe assembly 100 against the conical through hole 234 at the end of the horizontal connecting column 23 and the conical counter bore 322 at the end of the flange connecting column 32.
2. The pipe joint nut 5 is screwed on the horizontal connecting column 23 of the upper connecting seat 2 and the flange connecting column 32 of the lower connecting seat 3 respectively by using a torque wrench, the pipe joint nut 5 is screwed, pressure is transferred by screwing the pipe joint nut 5 into the pressing ring 4, the conical heads 105 at two ends of the high-pressure oil pipe assembly 100 are ensured to be respectively abutted against the conical through hole 234 at the end of the horizontal connecting column 23 and the conical counter bore 322 at the end of the flange connecting column 32, and tight conical surface sealing is formed by means of elastic deformation at one end of the screwing pressing ring 4. Finally, the pipe joint of the output end of the high-pressure oil pump is screwed into the threaded hole 233 at one end of the horizontal connecting column 23, so that the high-pressure oil pipe assembly 100 and the output end of the high-pressure oil pump are connected.
3. And starting the high-pressure oil pump, inputting hydraulic oil or turbine oil into the axial through hole 232 in the center of the horizontal connecting column 23 through the pipe joint, and then entering the counter bore 321 in the center of the end head of the flange connecting column 32 through the seamless steel pipe 101 of the high-pressure oil pipe assembly 100. Because the flange connecting column 32 has no oil outlet, the oil pressure in the high-pressure oil pipe assembly 100 gradually rises until the oil pressure rises to 240Mpa required by the ultrahigh-pressure test specification, and then the pressure is maintained for 1 minute, if the oil pressure in the high-pressure oil pipe assembly 100 displayed by the pressure gauge does not obviously drop, and the joint surface of the three-layer composite structure of the high-pressure oil pipe assembly 100 has no leakage phenomenon, the ultrahigh-pressure test of the tested high-pressure oil pipe assembly 100 is proved to be qualified. Otherwise, the tested high-pressure oil pipe assembly 100 is proved to be unqualified in the ultrahigh-pressure test and cannot be put into a warehouse for use. And (3) after the test is finished, closing the high-pressure oil pump, unscrewing the pipe joint, removing the hydraulic oil or the turbine oil, respectively detaching the pipe joint nuts 5 at the two ends of the tested high-pressure oil pipe assembly 100, and removing the high-pressure oil pipe assembly 100.
In addition to the above embodiments, the present invention can also have other embodiments, and all technical solutions formed by equivalent replacement or equivalent transformation are all within the protection scope required by the present invention.
Claims (6)
1. The ultrahigh pressure test tool for the high-pressure oil pipe assembly of the marine diesel engine is characterized by comprising a bottom plate, an upper connecting seat, a lower connecting seat, a pair of screwing-in pressing rings and a pair of pipe joint nuts, wherein the upper connecting seat is in an inverted T shape and comprises an integrated installation transverse plate and a vertical seat body, and two ends of the installation transverse plate are respectively fixed on one corner of the bottom plate through connecting screws and are positioned through a pair of positioning pins; the vertical base body extends upwards and vertically from the center of the installation transverse plate, the horizontal connecting column is inserted into the upper end of the vertical base body and is axially positioned by the end face shaft shoulder of the horizontal connecting column, and the horizontal connecting column is fixed in the upper end of the vertical base body through a conical end fastening screw; the lower connecting seat is of a flange structure, and the flange is fixed on the other corner of the bottom plate through a plurality of connecting screws and is positioned through a pair of positioning pins; a flange connecting column vertically extends upwards from the center of the flange, the flange connecting column is adjacent to the horizontal connecting column, the end of the flange connecting column is the same as the end of the horizontal connecting column in structure, and the relative positions of the end of the flange connecting column and the end of the horizontal connecting column are matched with the spatial positions of two ends of the high-pressure oil pipe assembly; the screwing-in pressing rings are screwed on two ends of the high-pressure oil pipe assembly respectively, and the pipe-connecting nuts penetrate through two end heads of the high-pressure oil pipe assembly respectively; the middle part of an inner hole of the pipe joint nut abuts against one end of the screwing-in pressing ring, one end of the pipe joint nut is screwed on the end head of the flange connecting column and the end head of the horizontal connecting column respectively, and conical heads at two ends of the high-pressure oil pipe assembly abut against the end head of the flange connecting column and the end head of the horizontal connecting column respectively, so that two ends of the high-pressure oil pipe assembly are fixedly connected with the upper connecting seat and the lower connecting seat in a radially sealed manner respectively; an axial through hole is formed in the center of the horizontal connecting column, a threaded hole connected with an output port of the high-pressure pump is formed in one end of the axial through hole, and a counter bore is formed in the center of the end head of the flange connecting column.
2. The marine diesel engine high pressure fuel pipe assembly ultrahigh pressure test tool according to claim 1, characterized in that the upper end of a counter bore in the center of the end of the flange connecting column is a tapered counter bore, the other end of an axial through hole in the end of the horizontal connecting column is a tapered through hole, and tapered heads at two ends of the high pressure fuel pipe assembly respectively abut against the tapered counter bore in the end of the flange connecting column and the tapered through hole in the end of the horizontal connecting column; the middle part of the inner hole of the pipe joint nut is also provided with a pipe joint nut taper hole which is respectively propped against a corresponding pressing ring taper head screwed into one end of the pressing ring, the taper angles of the taper counter bore, the taper through hole and the pipe joint nut taper hole are both 60 degrees, and the taper angles are matched with the taper angles alpha of the taper heads at the two ends of the high-pressure oil pipe assembly.
3. The marine diesel engine high pressure fuel pipe assembly ultrahigh pressure test tool of claim 2, characterized in that the end face of the pressing ring conical head at one end of the screwing pressing ring is provided with a cross groove, the other end of the screwing pressing ring is a screwing pressing ring threaded hole screwed on the end of the high pressure fuel pipe assembly, and the screwing direction of the thread of the screwing pressing ring threaded hole is opposite to that of the pipe joint nut.
4. The ultrahigh pressure test tool for the marine diesel engine high pressure oil pipe assembly according to claim 1, wherein an O-shaped sealing ring is arranged between the other end of the pipe joint nut and the outer peripheral surface of the sheath pipe of the high pressure oil pipe assembly.
5. The ultrahigh pressure test tool for the marine diesel engine high pressure oil pipe assembly according to claim 1, wherein the pipe joint nut and the screwing-in pressing ring are respectively made of alloy structural steel, and the grade of the alloy structural steel is 35 CrMo.
6. The ultrahigh pressure test tool for the marine diesel engine high-pressure oil pipe assembly according to claim 1, wherein the heat treatment hardness of the pipe joint nut and the screw-in pressing ring is HB 260-300.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220844774.2U CN217440199U (en) | 2022-04-13 | 2022-04-13 | Ultrahigh pressure test tool for high-pressure oil pipe assembly of marine diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220844774.2U CN217440199U (en) | 2022-04-13 | 2022-04-13 | Ultrahigh pressure test tool for high-pressure oil pipe assembly of marine diesel engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217440199U true CN217440199U (en) | 2022-09-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220844774.2U Active CN217440199U (en) | 2022-04-13 | 2022-04-13 | Ultrahigh pressure test tool for high-pressure oil pipe assembly of marine diesel engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217440199U (en) |
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2022
- 2022-04-13 CN CN202220844774.2U patent/CN217440199U/en active Active
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