CN110701412B - Expansion joint of sub-rigid structure of hydropower station pressure steel pipe - Google Patents
Expansion joint of sub-rigid structure of hydropower station pressure steel pipe Download PDFInfo
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- CN110701412B CN110701412B CN201910986038.3A CN201910986038A CN110701412B CN 110701412 B CN110701412 B CN 110701412B CN 201910986038 A CN201910986038 A CN 201910986038A CN 110701412 B CN110701412 B CN 110701412B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 50
- 239000010959 steel Substances 0.000 title claims abstract description 50
- 230000005489 elastic deformation Effects 0.000 claims abstract description 17
- 238000005452 bending Methods 0.000 claims abstract description 14
- 230000008093 supporting effect Effects 0.000 claims abstract description 9
- 230000000903 blocking effect Effects 0.000 claims abstract description 6
- 238000007789 sealing Methods 0.000 claims description 47
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- 239000000463 material Substances 0.000 claims description 16
- 230000007246 mechanism Effects 0.000 claims description 10
- 230000008859 change Effects 0.000 claims description 5
- 238000010521 absorption reaction Methods 0.000 claims description 4
- 239000002184 metal Substances 0.000 description 10
- 238000005299 abrasion Methods 0.000 description 6
- 238000003466 welding Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 229920000642 polymer Polymers 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L51/00—Expansion-compensation arrangements for pipe-lines
- F16L51/02—Expansion-compensation arrangements for pipe-lines making use of bellows or an expansible folded or corrugated tube
- F16L51/022—Expansion-compensation arrangements for pipe-lines making use of bellows or an expansible folded or corrugated tube with a single corrugation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L51/00—Expansion-compensation arrangements for pipe-lines
- F16L51/02—Expansion-compensation arrangements for pipe-lines making use of bellows or an expansible folded or corrugated tube
- F16L51/027—Expansion-compensation arrangements for pipe-lines making use of bellows or an expansible folded or corrugated tube with external reinforcement
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Joints Allowing Movement (AREA)
Abstract
The invention discloses a sub-rigid body structure expansion joint of a hydropower station pressure steel pipe, which comprises an inlet pressure short pipe, an outlet pressure short pipe, an inlet wave core ring, an outlet wave core ring, a wave shell, a rigid body ring used for radially supporting the wave shell and a wave core body used for transmitting medium pressure in the middle of the wave shell to the rigid body ring, wherein elastic deformation gaps are reserved between the wave shell and the inlet wave core ring and between the wave shell and the outlet wave core ring, so that when the wave shell is subjected to complex stress to generate bending deformation, force is transmitted to the inlet wave core ring and the outlet wave core ring through two ends of the wave shell respectively to form slope protection on two ends of the wave shell, the wave core body is arranged between an inward wave cavity and the rigid body ring of the wave shell in a blocking mode, and a relative elastic deformation gap is kept between the wave core body and the inner wall surface of the inward wave cavity to form protection on a middle slope of the wave shell. The expansion joint with the sub-rigid structure of the hydropower station pressure steel pipe has the advantages of good flexibility, large bearing capacity, zero leakage and long service life.
Description
Technical Field
The invention relates to the technical field of expansion joint devices for connecting metal pipelines to form conveying pipelines, in particular to an expansion joint with a sub-rigid body structure of a pressure steel pipe of a hydropower station.
Background
The metal pipeline for conveying substances, especially the metal pipeline with larger pipe diameter or large pipe diameter and higher water pressure or extra-high water pressure, is easy to damage due to radial stress generated by the deflection of the steel pipe caused by the physical property or natural environment of the conveyed substances, especially the metal pipeline with larger pipe diameter or large pipe diameter and higher water pressure or extra-high water pressure. Therefore, an expansion joint device (also called an expansion joint) is required to be arranged at the joint of the phase positions of the metal pipelines so as to avoid damage caused by radial stress.
The traditional telescopic joint device has simple structure, but the defect of serious water leakage cannot be overcome.
The structure of the non-rigid body structure of the 'leakless pipe expansion joint device' disclosed in 12 months and 16 days 1998 (publication No. CN 2300785Y) is shown in figure 1, the device is provided with two short pipes (short pipe 1 and short pipe 2 shown in figure 1) and a sleeve 3, the joint ends of the two short pipes are all positioned in the sleeve, one end part of the sleeve 3 is connected with the pipe wall of one short pipe (short pipe 1 shown in figure 1), the inner wall surface of the other end part of the sleeve 3 is in matched contact with the outer wall surface of the end part of the other short pipe (short pipe 2 shown in figure 1), a certain matched gap is formed, namely the other end of the sleeve 3 is matched with the outer wall surface of the short pipe 2 and can generate a free end which slides relatively axially, a telescopic gap 4 is formed between the joint ends of the two short pipes, a corrugated pipe section 5 is arranged in the telescopic gap, and the two ends of the corrugated pipe section are respectively connected with the joint ends of the two short pipes in a sealing state. The technical problem that the traditional telescopic joint device seriously leaks is overcome, the metal pipeline with low water head and small pipe diameter can be ensured not to leak, but due to the lack of a radial supporting wave core body for transmitting radial force, when the telescopic joint device is used for a pressure steel pipe with large pipe diameter and high pressure, the corrugated pipe needs to bear corresponding large radial force, in the case, the corrugated pipe section of the thin-shell structure generates excessive outward bulge deformation due to the overlarge radial force, the connection part of the body and the short pipe is easy to break, and the service life of the corrugated pipe section of the thin-shell structure is short.
The existing expansion joint device solves the technical problems that the corrugated pipe section is outwards bulged and deformed when the 'non-leakage pipeline expansion joint device' is used for a large-pipe-diameter and high-pressure steel pipe, and can ensure that a large-pipe-diameter and high-water-pressure metal pipeline is not leaked, but the existing expansion joint device does not protect the middle slope and the side slope of a wave shell, so that the structure of the expansion joint device is easy to damage, the bearing force is small and the service life is short.
Disclosure of Invention
The invention provides a hydropower station pressure steel pipe sub-rigid body structure expansion joint, which aims to solve the technical problems that the structure of the existing expansion joint device is easy to damage, small in bearing capacity and short in service life.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
The utility model provides a hydropower station pressure steel pipe sub-rigid body structure telescopic joint, including the entry pressure nozzle stub, the export pressure nozzle stub, the entry ripples core ring, export ripples core ring, ripples casing, be used for radial support effect's rigid body ring to ripples casing and be used for the medium pressure in the centre of ripples casing to the ripples core body of rigid body ring, entry pressure nozzle stub and export pressure nozzle stub set up relatively, entry ripples core ring welded seal connects on the terminal surface of the exit end of entry pressure nozzle stub, export ripples core ring welded seal connects on the terminal surface of the entry end of export pressure nozzle stub, be equipped with axial expansion gap between entry ripples core ring and the export ripples core ring, be equipped with ripples casing along axial in the axial expansion gap, the both ends of ripples casing pass through welded seal connection with entry ripples core ring and export ripples core ring respectively, elastic gaps are reserved between the wave shell and the inlet wave core ring and between the wave shell and the outlet wave core ring, so that when the wave shell is subjected to complex stress to generate bending deformation, the force is transmitted to the inlet wave core ring and the outlet wave core ring through the two ends of the wave shell respectively to form slope protection on the two ends of the wave shell, the rigid body ring is sleeved on the periphery of the wave shell, the two ends of the rigid body ring are respectively connected with the outer wall surfaces of the inlet pressure short pipe and the outlet pressure short pipe in a sealing sleeved mode and are provided with at least one free end, the wave shell, the wave core body and the rigid body ring are combined to form a flexible high-strength tubular sealing telescopic pressure-bearing structure, and the water pressure born by the wave shell is transmitted to the rigid body ring through the wave core body safely and reliably; the wave core body is arranged between the inward wave cavity and the rigid ring in a blocking manner, and a relative elastic deformation gap is kept between the wave core body and the inner wall surface of the inward wave cavity, so that when the wave shell is subjected to complex stress to generate bending deformation, the force is transmitted to the rigid ring through the wave core body, and the protection of the middle slope of the wave shell is formed.
Further, the outlet end of the inlet wave core ring is a wedge slope surface arranged towards the wave core ring, the outlet end of the inlet wave core ring is welded and hermetically connected with the inlet end of the wave shell, a wedge-shaped elastic gap is reserved between the outlet end of the inlet wave core ring and the inlet end of the wave shell so as to transmit the force received by the inlet end of the wave shell to the wave core ring, the inlet end of the outlet wave core ring is a wedge slope surface arranged towards the wave core ring, the inlet end of the outlet wave core ring is welded and hermetically connected with the outlet end of the wave shell, and a wedge-shaped elastic gap is reserved between the inlet end of the outlet wave core ring and the outlet end of the wave shell so as to transmit the force received by the outlet end of the wave shell to the wave core ring.
Further, the blocky wave core body is a vibration absorption and wear-resistant body, and the wave core body is formed by wrapping a rigid material with the vibration absorption and wear-resistant material.
Further, the cross section of the wave core body is in the shape of an inverted trapezoid, a circle, an ellipse or a semicircle.
Further, the cross-sectional shape of the wave core body is matched with the cross-sectional shape of the elastic deformation gap of the inward wave cavity.
Further, the wave core bodies are divided into a plurality of blocks along the circumference of the rigid body ring to fill the inward wave cavity of the wave shell.
Further, the expansion joint of the sub-rigid structure of the hydropower station pressure steel pipe further comprises a sealing ring and a pressing mechanism, the rigid ring is provided with a fixed end and a free end, the fixed end of the rigid ring is welded with the outer wall surface of the inlet pressure short pipe, and the free end of the rigid ring is in sealing connection with the outer wall surface of the outlet pressure short pipe through the pressing mechanism and the sealing ring.
Further, the pressing mechanism is a pressing ring positioned at one side of the free end of the rigid ring, and the sealing ring is clamped between the pressing ring and the rigid ring.
Further, an inlet flange is arranged at the inlet end of the inlet pressure short pipe, and an outlet flange is arranged at the outlet end of the outlet pressure short pipe.
Further, the expansion joint of the sub-rigid body structure of the hydropower station pressure steel pipe further comprises an abrasion-resistant ring axially arranged in the inner cavity of the wave shell, a first end of the abrasion-resistant ring is arranged on the side wall of the outlet end of the inlet pressure short pipe, a second gap is arranged between a second end of the abrasion-resistant ring and the side wall of the inlet end of the outlet pressure short pipe, and a third gap is arranged between the outer wall surface of the abrasion-resistant ring and the inward wave top of the wave shell.
The invention has the following beneficial effects:
According to the expansion joint with the sub-rigid structure of the hydropower station pressure steel pipe, an axial expansion gap is arranged between the inlet wave core ring and the outlet wave core ring, a wave shell is axially arranged in the axial expansion gap, the rigid ring is sleeved on the periphery of the wave shell, two ends of the rigid ring are respectively and hermetically connected with the outer wall surfaces of the inlet pressure short pipe and the outlet pressure short pipe, so that the connection between the inlet wave core ring and the inlet pressure short pipe and the connection between the outlet wave core ring and the outlet pressure short pipe are both in the sleeved area of the rigid ring, the sealing protection of the rigid ring is obtained, and the damage of the connection part due to external factors is prevented; the wave shell is hermetically connected with the inlet wave core ring and the outlet wave core ring to form a first layer of elastic sealing layer, and the rigid ring is hermetically connected with the inlet pressure short pipe and the outlet pressure short pipe to form a second layer of rigid sealing layer, so that the wave shell is protected by double layers of sealing, mutual sealing interference and movement obstruction are not formed, and a double stable sealing combined structure is formed; the two ends of the wave shell are respectively and hermetically connected with the inlet wave core ring and the outlet wave core ring through welding, and elastic gaps are reserved between the wave shell and the inlet wave core ring and between the wave shell and the outlet wave core ring, so that when the wave shell is subjected to complex stress to generate bending deformation, the force is transmitted to the inlet wave core ring and the outlet wave core ring through the two ends of the wave shell respectively, and slope protection on the two ends of the wave shell is formed; the wave core body is arranged between the inward wave cavity and the rigid body ring of the wave shell in a blocking manner, and elastic deformation gaps are reserved between the wave shell and the inlet wave core ring and between the wave shell and the outlet wave core ring, so that when the wave shell is subjected to complex stress and generates bending deformation, the force is transmitted to the inlet wave core ring and the outlet wave core ring through the two ends of the wave shell respectively, and a relative elastic deformation gap is kept between the wave core body and the inner wall surface of the inward wave cavity, so that when the wave shell is subjected to complex stress and generates bending deformation, the force is transmitted to the rigid body ring through the wave core body, the protection of a middle slope of the wave shell is formed, the radial medium pressure born by the wave shell can be transmitted to the rigid body ring, the damage of the wave shell is prevented, the expansion joint of the sub-rigid body structure of the hydropower station pressure steel pipe has good flexibility, large bearing capacity and zero leakage, and long service life; moreover, because the expansion joint of the sub-rigid body structure of the hydropower station pressure steel pipe mainly comprises a wave shell, a wave core body and a rigid body ring, the wave shell, the wave core body and the rigid body ring are combined to form a flexible high-strength tubular sealing expansion bearing structure, the water pressure born by the wave shell in the pipe is safely and reliably transferred to the rigid body ring through the wave core body, and the wall thickness of the rigid body ring is designed according to the design specification of the pressure steel pipe, the expansion joint of the sub-rigid body structure of the hydropower station pressure steel pipe has the bearing capacity equal to the PD value (design pressure value) of the established pressure steel pipe, and the fully-sealed metal wave shell structure of the expansion joint of the sub-rigid body structure of the hydropower station pressure steel pipe ensures that the expansion joint of the sub-rigid body structure of the hydropower station has good expansion and change capacity and achieves the sealing effect with different fully-sealed dripping, so that the water leakage problem of the transmission expansion joint is thoroughly solved.
In addition to the objects, features and advantages described above, the present invention has other objects, features and advantages. The present invention will be described in further detail with reference to the drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:
FIG. 1 is a schematic illustration of a "leak-free pipe expansion joint arrangement";
FIG. 2 is a schematic structural view of a sub-rigid body structural expansion joint of a pressure steel pipe of a hydropower station according to a preferred embodiment of the invention;
Fig. 3 is an enlarged view at a in fig. 2.
Legend description:
100. Expansion joint of sub-rigid structure of pressure steel pipe in hydropower station; 10. an inlet pressure spool; 11. a spring gap; 12. a second gap; 13. a third gap; 20. an outlet pressure spool; 30. an inlet core ring; 31. an axial expansion gap; 40. an outlet wave core ring; 50. a wave housing; 51. an outward wave crest; 52. an inward wave cavity; 53. an inward wave crest; 60. a rigid body ring; 70. a wave core; 71. a rigid member; 72. a wear part; 80. a seal ring; 90. a compression ring; 91. and (5) an anti-abrasion ring.
Detailed Description
Embodiments of the invention are described in detail below with reference to the attached drawing figures, but the invention can be practiced in a number of different ways, as defined and covered below.
FIG. 1 is a schematic illustration of a "leak-free pipe expansion joint arrangement"; FIG. 2 is a schematic structural view of a telescopic joint of a sub-rigid body structure of a pressure steel pipe of a hydropower station according to a preferred embodiment of the invention; fig. 3 is an enlarged view at a in fig. 2. Arrows in fig. 3 indicate the medium flow direction.
As shown in fig. 2 and 3, the expansion joint 100 of the sub-rigid structure of the penstock of the hydropower station of this embodiment comprises an inlet pressure short pipe 10, an outlet pressure short pipe 20, an inlet wave core ring 30, an outlet wave core ring 40, a wave housing 50, a rigid body ring 60 for supporting the wave housing 50 radially, and a wave core 70 for transmitting medium pressure in the middle of the wave housing 50 to the rigid body ring 60, the inlet pressure short pipe 10 and the outlet pressure short pipe 20 are oppositely disposed, the inlet wave core ring 30 is welded and sealed to the end face of the outlet end of the inlet pressure short pipe 10, the outlet wave core ring 40 is welded and sealed to the end face of the inlet end of the outlet pressure short pipe 20, an axial expansion gap 31 is arranged between the inlet wave core ring 30 and the outlet wave core ring 40, a wave shell 50 is axially arranged in the axial expansion gap 31, two ends of the wave shell 50 are respectively and hermetically connected with the inlet wave core ring 30 and the outlet wave core ring 40 through welding, and elastic change gaps are reserved between the wave shell 50 and the inlet wave core ring 30 and between the wave shell 50 and the outlet wave core ring 40, so that when the wave shell 50 is subjected to complex stress and generates bending deformation, the force is transmitted to the inlet wave core ring 30 and the outlet wave core ring 40 through the two ends of the wave shell 50 respectively, slope protection is formed on the two ends of the wave shell 50, a rigid body ring 60 is sleeved on the periphery of the wave shell 50, the two ends of the rigid body ring 60 are respectively connected with the outer wall surfaces of the inlet pressure short pipe 10 and the outlet pressure short pipe 20 in a sealing sleeved mode and are provided with at least one free end, the wave shell 50, the wave core 70 and the rigid body ring 60 are combined to form a flexible high-strength tubular sealing telescopic pressure-bearing structure, and the water pressure born by the wave shell 50 is safely and reliably transmitted to the rigid body ring 60 through the wave core 70; the wave core 70 is mounted between the inward wave cavity 52 and the rigid ring 60 of the wave housing 50 in a blocking manner, and a relative elastic deformation gap is kept between the wave core 70 and the inner wall surface of the inward wave cavity 52, so that when the wave housing 50 is subjected to complex stress and generates bending deformation, the force is transmitted to the rigid ring 60 through the wave core 70, and the protection of the middle slope of the wave housing 50 is formed. According to the expansion joint 100 with the sub-rigid structure of the hydropower station pressure steel pipe, an axial expansion gap 31 is arranged between an inlet wave core ring 30 and an outlet wave core ring 40, a wave shell 50 is axially arranged in the axial expansion gap 31, a rigid body ring 60 is sleeved on the periphery of the wave shell 50, two ends of the rigid body ring 60 are respectively and hermetically connected with the outer wall surfaces of an inlet pressure short pipe 10 and an outlet pressure short pipe 20, so that the connection between the inlet wave core ring 30 and the inlet pressure short pipe 10 and the connection between the outlet wave core ring 40 and the outlet pressure short pipe 20 are both positioned in the sleeved area of the rigid body ring 60, the sealing protection of the rigid body ring 60 is obtained, and the damage of the connection part due to external factors is prevented; the wave shell 50 is in sealing connection with the inlet wave core ring 30 and the outlet wave core ring 40 to form a first layer of elastic sealing layer, and the rigid body ring 60 is in sealing connection with the inlet pressure short pipe 10 and the outlet pressure short pipe 20 to form a second layer of rigid sealing layer, so that the wave shell 50 is subjected to double-layer sealing protection and cannot form mutual sealing interference and movement obstruction, and a double stable sealing combined structure is formed; the two ends of the wave shell 50 are respectively and hermetically connected with the inlet wave core ring 30 and the outlet wave core ring 40 through welding, and elastic gaps are reserved between the wave shell 50 and the inlet wave core ring 30 and between the wave shell 50 and the outlet wave core ring 40, so that when the wave shell 50 is subjected to complex stress and generates bending deformation, the force is transmitted to the inlet wave core ring 30 and the outlet wave core ring 40 through the two ends of the wave shell 50 respectively, and slope protection on the two ends of the wave shell 50 is formed; the wave core 70 is arranged between the inward wave cavity 52 and the rigid body ring 60 of the wave shell 50 in a blocking way, and elastic deformation gaps are reserved between the wave shell 50 and the inlet wave core ring 30 and between the wave shell 50 and the outlet wave core ring 40, so that when the wave shell 50 is subjected to complex stress and generates bending deformation, the force is transmitted to the inlet wave core ring 30 and the outlet wave core ring 40 respectively through the two ends of the wave shell 50, a relative elastic deformation gap is kept between the wave core 70 and the inner wall surface of the inward wave cavity 52, so that when the wave shell 50 is subjected to complex stress and generates bending deformation, the force is transmitted to the rigid body ring 60 through the wave core 70, the protection of the middle slope of the wave shell 50 is formed, radial medium pressure received by the wave shell 50 can be transmitted to the rigid ring 60, the wave shell 60 is prevented from being damaged, the expansion joint 100 of the sub-rigid structure of the hydropower station pressure steel pipe has good flexibility, large bearing capacity, zero leakage and long service life; in addition, since the expansion joint 100 of the sub-rigid structure of the pressure steel pipe of the hydropower station mainly comprises the wave shell 50, the wave core 70 and the rigid ring 60, the wave shell 50, the wave core 70 and the rigid ring 60 are combined to form a flexible high-strength tubular sealed expansion bearing structure, the water pressure born by the wave shell 50 in the pipe is safely and reliably transmitted to the rigid ring 60 through the wave core 70, and the wall thickness of the rigid ring 60 is designed according to the design specification of the pressure steel pipe, the expansion joint 100 of the sub-rigid structure of the pressure steel pipe of the hydropower station has the bearing capacity of the PD value design pressure value equivalent to the PD value design pressure value of the preset pressure steel pipe, the sub-rigid structure of the pressure steel pipe of the hydropower station is expanded, the full-sealed metal wave shell structure of the 100, the expansion joint 100 with the sub-rigid body structure of the pressure steel pipe of the hydropower station has good expansion and contraction changing capability, achieves different sealing effects of fully sealing dripping water, and thoroughly solves the water leakage problem of the transmission expansion joint.
It can be understood that the expansion joint with the sub-rigid body structure of the hydropower station pressure steel pipe can be used between the water diversion steel pipe sections of the hydropower station and connected with the inlet ends of the water wheel spiral case, and can be used for connecting the inlet ends of expansion joints with different pipe diameters and different liquid medium oil and water with the hydropower station pressure steel pipe.
It can be appreciated that the wave housing 50 may be a bellows, and the number of bellows of the wave housing 50 may be one or more, which is set according to actual use situations.
More preferably, the inlet wave core ring 30, the outlet wave core ring 40 and the wave shell 50 are made of the same material, so that the inlet pressure short pipe 10 and the outlet pressure short pipe 20 are connected in a sealing state, the inlet wave core ring 30, the outlet wave core ring 40 and the wave shell 50 are made of the same material, the thin and soft wave shell 50 and the inlet wave core ring 30 and the outlet wave core ring 40 at two ends of the wave shell are made of the same material, and the corrosion resistance and the service life of joints at two ends of the wave shell 50 are guaranteed due to the consistency of the materials, meanwhile, the welding of the two ends of the wave shell 50 with thin and soft surfaces and the inlet pressure short pipe 10 and the outlet pressure short pipe 20 which are made of different materials is avoided, the damage of the wave shell 50 during welding is prevented, the corrosion resistance and the structural performance of the wave shell 50 are improved, and the service life of the expansion joint 100 of the sub-rigid structure of the hydropower station pressure steel pipe is improved. In this embodiment, the inlet core ring 30, the outlet core ring 40 and the wave housing 50 are made of stainless steel, and the inlet pressure short pipe 10 and the outlet pressure short pipe 20 are made of high-strength steel. The two ends of the rigid body ring 60 are respectively connected with the outer wall surfaces of the inlet pressure short pipe 10 and the outlet pressure short pipe 20 in a sealing way and are provided with at least one free end, specifically: the ends of the two ends of the rigid ring 60 are respectively contacted with the outer wall surfaces of the inlet pressure short pipe 10 and the outlet pressure short pipe 20 in a matching way, and a certain matching clearance is reserved, namely, a certain radial matching clearance is reserved between the inner wall surface of the rigid ring 60 and the outer wall surfaces of the inlet pressure short pipe 10 and the outlet pressure short pipe 20, so that the rigid ring 60 has a rigid supporting effect on the wave shell 50 when the wave shell 50 is subjected to radial pressure and is outwards bulge-deformed as the outward wave top 51 of the wave shell 50 is contacted or tends to contact with the inner wall surface of the rigid ring 60 while the free end of the rigid ring 60 can slide along the axial direction; because the axial expansion gap 31 is arranged between the inlet wave core ring 30 and the outlet wave core ring 40, the wave shell 50 is axially arranged in the axial expansion gap 31, the two ends of the wave shell 50 are respectively in sealing connection with the inlet wave core ring 30 and the outlet wave core ring 40, and the wave shell 50 arranged in the axial expansion gap 31 has axial scalability under the action of external force, the tightness of the expansion joint 100 of the pressure steel pipe sub-rigid structure of the hydropower station is ensured, the axial expansion of a metal pipeline due to the influence of temperature can be satisfied, and the axial stress of the pipeline is effectively eliminated.
It will be appreciated that the present invention is primarily directed to medium tight penstock, with wave shell 50 being a flexible member having a telescoping dislocation, bending deformation, and wave core 70 being a force transmitting member, and wave core ring 40 being a force bearing member.
It can be appreciated that, in the present embodiment, the two ends of the wave housing 50 are welded with the side walls of the inlet wave core ring 30 and the outlet wave core ring 40 respectively through deformed steel, and the thickness of the side wall surfaces of the inlet wave core ring 30 and the outlet wave core ring 40 is large, and the welding contact area with the inlet pressure short pipe 10 and the outlet pressure short pipe 20 is large, so that the sealing performance of the expansion joint 100 of the sub-rigid structure of the hydropower station pressure steel pipe is ensured, and the influence on the corrosion resistance of the expansion joint 100 of the sub-rigid structure of the hydropower station pressure steel pipe is small.
It may be understood that the wave core 70 is disposed between the inward wave cavity 52 of the wave housing 50 and the rigid ring 60, and the wave core 70 may be disposed in the inward wave cavity 52 of the wave housing 50, the outer wall of the wave core 70 abuts against the inner wall surface of the rigid ring 60, and the inner wall of the wave core 70 is disposed towards the surface direction of the wave housing 50 and leaves a spring gap 11 between the inner wall surface of the inward wave cavity 52. By providing the spring gap 11, an elastically deformable space of the inward wave cavity 52 is ensured when the telescopic tube is subjected to axial and/or radial forces. It will be appreciated that, in order to satisfy the deformation gap generated by the inward wave cavity 52 within the elastic deformation range, that is, the elastic deformation of the inward wave cavity 52 within the elastic deformation gap 11 without damaging the structure of the inward wave cavity 52, specifically, by providing the wave core 70 with radial supporting function on the wave housing 50, when the inward wave cavity 52 is subjected to large radial pressure, the top of the inner wall surface of the inward wave cavity 52 contacts with the surface of the wave core 70, the wave core 70 has rigid supporting function on the inward wave cavity 52, the radial force is transmitted, and is received by the wave core 70 with sufficient strength, so as to prevent the inward wave cavity 52 from further deforming, and since the inward wave cavity 52 can only generate radial deformation at the elastic deformation gap 11, the elastic deformation of the inward wave cavity 52 is within the bearable range, so that the wave housing 50 is prevented from being damaged, and the running stability and reliability of the device are ensured. It can be appreciated that by providing the rigid ring 60 and the wave core 70 together to rigidly support the wave housing 50, the stability of the wave housing 50 when subjected to radial pressure is greatly improved, and the thickness of the wave housing 50 can be reduced, improving the effect of stress on the wave housing 50.
Further, the outlet end of the inlet core ring 30 is a wedge slope set toward the core ring 40, the outlet end of the inlet core ring 30 is welded and sealed with the inlet end of the wave housing 50 with a wedge-shaped elastic gap therebetween so as to transmit the force received by the inlet end of the wave housing 50 to the core ring 30, the inlet end of the outlet core ring 40 is a wedge slope set toward the core ring 30, and the inlet end of the outlet core ring 40 is welded and sealed with the outlet end of the wave housing 50 with a wedge-shaped elastic gap therebetween so as to transmit the force received by the outlet end of the wave housing 50 to the core ring 30. The slope surfaces of the slopes at the two ends of the wave shell 50 are matched with the wedge-shaped slope surfaces to form a multidirectional elastic support, so that the slopes at the two ends of the wave shell 50 are protected.
It can be understood that the connection end surface of the outlet end of the inlet wave core ring 30 has an arc structure that is matched with the arc curved surface of the inlet end of the wave housing 50, the connection end surface of the inlet end of the outlet wave core ring 40 has an arc structure that is matched with the arc curved surface of the outlet end of the wave housing 50, the end of the curved end of the inlet wave core ring 30 and the end of the curved end of the outlet wave core ring 40 are fixedly connected with the arc end of the arc structure of the wave housing 50 in a sealing manner, and the curved end of the inlet wave core ring 30 and the curved end of the outlet wave core ring 40 have the wedge-shaped elastic deformation gaps with the arc portions of the arc structure, so as to form an elastic strain field. The contact area is increased through the arc structure, and the two ends of the wave shell 50 are in sealing connection, and due to the deformation clearance, the inlet wave core ring 30 and the outlet wave core ring 40 can play a role in rigidly supporting the wave shell 50, and meanwhile, the inlet end and the outlet end of the wave shell 50 are elastically supported, so that the sealing performance and the connection stability of the wave shell 50 are ensured when the wave shell 50 deforms axially or radially, and the protection of a slope in the wave shell 50 is improved. It will be appreciated that the arcuate mechanism may be a multi-curved arcuate surface structure.
Specifically, the inlet wave core ring 30 is welded and sealed to the end face of the outlet end of the inlet pressure short pipe 10, the outlet wave core ring 40 is welded and sealed to the end face of the inlet end of the outlet pressure short pipe 20, the inlet wave core ring 30 and the inlet pressure short pipe 10 form a whole ring structure, the outlet wave core ring 40 and the outlet pressure short pipe 20 form a whole ring structure, the inlet wave core ring 30 and the outlet wave core ring 40 support the two ends of the wave shell 50, the hydraulic power of the end part of the wave shell 50 can be transmitted to the inlet wave core ring 30 and the outlet wave core ring 40 at the two ends of the wave shell 50, the hydraulic power is received by the whole ring structure with enough strength, the wave shell 50 is prevented from further stretching and elongating, the end part of the wave shell 50 is protected, and the end part of the wave shell 50 is prevented from being damaged.
Further, the block-shaped wave core 70 is a vibration absorbing and wear-resistant body, and the wave core 70 is formed by wrapping a rigid material with a vibration absorbing and wear-resistant material. As can be appreciated, the first end of the wave core 70 abuts against the inner wall surface of the rigid ring 60, and the second end of the wave core 70 is disposed toward the surface of the wave housing 50 and leaves a spring gap 11 between the surface of the inward wave cavity 52. Specifically, the vibration absorbing and wear-resistant material can be a high polymer rubber pad, a high polymer plastic pad, a corrugated cushion, an elastic cushion and other cushion which can be slightly deformed or a high polymer wear-resistant material; by transmitting the compression deformation of the wear-resistant member 72 made of the vibration-absorbing wear-resistant material to the rigid member 71 made of the rigid material when the wave core 70 is compressed, the abrupt stress change of the wave housing 50 is prevented, the damage of the wave housing 50 is prevented, and the service life of the wave housing 50 is improved.
Further, the cross-section of the wave core 70 has an inverted trapezoid, a circle, an ellipse, or a semicircle.
More preferably, the cross-sectional shape of the wave core 70 matches the cross-sectional shape of the elastically deformed gap of the inward wave cavity 52. The inward wave cavity 52 can generate a plurality of stress supporting points, and the structural integrity of the inward wave cavity 52 is maintained when the inward wave cavity 52 is stressed and deformed.
More preferably, the plurality of wave cores 70 are segmented and fill the inward wave cavity 52 of the wave housing 50 along the circumference of the rigid body ring 60. Specifically, the plurality of wave cores 70 are uniformly spaced apart or uniformly closely spaced along the circumference of the rigid ring 60. It should be understood that the number of wave cores 70 may be four, six, or the like.
Further, the expansion joint of the sub-rigid structure of the hydropower station pressure steel pipe further comprises a sealing ring 80 and a pressing mechanism, the rigid ring 60 is provided with a fixed end and a free end, the fixed end of the rigid ring 60 is welded with the outer wall surface of the inlet pressure short pipe 10, and the free end of the rigid ring 60 is in sealing connection with the outer wall surface of the outlet pressure short pipe 20 through the pressing mechanism and the sealing ring 80. More preferably, the pressing mechanism is a pressing ring 90 located on the end face side of the free end of the rigid ring 60, and the seal ring 80 is disposed between the pressing ring 90 and the rigid ring 60. It should be understood that the pressure ring may be welded to the free end of the rigid ring 60, or may be connected to the free end of the rigid ring 60 by a connection such as a snap connection or a bolt connection. In this embodiment, the pressure ring 90 may be fixedly connected to the inlet pressure short pipe 10 or the outlet pressure short pipe 20, and a movable gap is left between the end surface of the pressure ring 90 and the end surface of the free end of the rigid ring 60. By arranging one end of the rigid ring 60 fixedly connected with the inlet pressure short pipe 10, the fixed end of the rigid ring 60 and the inlet pressure short pipe 10 form a rigid whole, so that the fixed end of the rigid ring 60 moves axially along with the inlet pressure short pipe 10 relative to the outlet pressure short pipe 20, and the wave shell 50 is compressed or stretched axially.
Further, the inlet end of the inlet pressure spool 10 is provided with an inlet flange and the outlet end of the outlet pressure spool 20 is provided with an outlet flange. The expansion joint 100 of the sub-rigid body structure of the pressure steel pipe of the hydropower station is connected with adjacent pipelines through flanges, so that the expansion joint is convenient to disassemble, assemble, maintain and replace, and the leakage reason is convenient to find by opening the expansion joint.
Further, the expansion joint 100 of the sub-rigid body structure of the penstock of the hydropower station further comprises a wear-resistant ring 91 axially arranged in the inner cavity of the wave shell 50, a first end of the wear-resistant ring 91 is arranged on the side wall of the outlet end of the inlet pressure short tube 10, a second gap 12 is arranged between a second end of the wear-resistant ring 91 and the side wall of the inlet end of the outlet pressure short tube 20, and a third gap 13 is arranged between the outer wall surface of the wear-resistant ring 91 and the inward wave crest 53 of the wave shell 50. It will be appreciated that in the present embodiment, by providing the wear-resistant ring 91, the abrasion of the inner wall surface of the wave housing 50 by the medium can be effectively reduced, the service life of the wave housing 50 can be prolonged, by providing the second gap 12 to satisfy the displacement requirement of the rigid body ring 60 moving in the axial direction, and by providing the third gap 13 to satisfy the space required for the bellows of the wave housing 50 to deform in the radial direction when compressed.
The invention also provides a hydropower station which comprises the expansion joint 100 with the sub-rigid body structure of the hydropower station pressure steel pipe.
In a specific implementation, an expansion joint 100 with a sub-rigid structure of a pressure steel pipe of a hydropower station is provided, the interface ends of an inlet pressure short pipe 10 and an inlet wave core ring 30 and the interface ends of an outlet pressure short pipe 20 and an outlet wave core ring 40 are both positioned in a rigid ring 60, the connection ends of a wave shell 50 and the inlet wave core ring 30 and the outlet wave core ring 40 at the two ends are both positioned in the rigid ring 60, an outward wave top 51 of the wave shell 50 contacts with the inner wall surface of the rigid ring 60, a wave core 70 is arranged in an inward wave cavity 52 of the wave shell 50, and a spring gap 11 is arranged between the wave core 70 and the inward wave cavity 52. The two ends of the rigid body ring 60 are respectively connected with the outer wall surfaces of the inlet pressure short pipe 10 and the outlet pressure short pipe 20 in a sealing way, and the two ends of the rigid body ring 60 are free ends, or one end is the free end and the other end is connected with the corresponding inlet pressure short pipe 10 or outlet pressure short pipe 20; the scalability of the wave housing 50 may be such that the expansion and contraction of the inlet pressure spool 10 and/or the outlet pressure spool 20 is imparted. When the wave shell 50 bears radial internal water pressure, the rigid body ring 60, the wave core body 70, the inlet wave core ring 30 and the outlet wave core ring 40 arranged on two sides of the wave shell 50 are rigidly supported by the wave shell, and the sub-rigid body structure with the flexibility and the bearing rigidity can be used for reliably designing and applying various hydropower station pressure steel pipes, in particular to telescopic sections of large-pipe-diameter high-water-head pressure steel pipes. Another effect of the inlet and outlet core rings 30, 40 is due to the consistency of the materials used between the wave housing 50 and the inlet core ring 30 and between the wave housing 50 and the outlet core ring 40, which in turn guarantees the corrosion resistant life of the joint with the wave housing 50.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. A hydropower station pressure steel pipe sub-rigid structure expansion joint is characterized in that,
Comprises an inlet pressure short pipe (10), an outlet pressure short pipe (20), an inlet wave core ring (30), an outlet wave core ring (40), a wave shell (50), a rigid body ring (60) used for radially supporting the wave shell (50) and a wave core body (70) used for transmitting medium pressure in the middle of the wave shell (50) to the rigid body ring (60),
The inlet pressure short pipe (10) and the outlet pressure short pipe (20) are oppositely arranged, the inlet wave core ring (30) is welded and hermetically connected to the end face of the outlet end of the inlet pressure short pipe (10), the outlet wave core ring (40) is welded and hermetically connected to the end face of the inlet end of the outlet pressure short pipe (20), an axial expansion gap (31) is arranged between the inlet wave core ring (30) and the outlet wave core ring (40), the wave shell (50) is axially arranged in the axial expansion gap (31), two ends of the wave shell (50) are respectively connected with the inlet wave core ring (30) and the outlet wave core ring (40) in a sealing manner, elastic gaps are reserved between the wave shell (50) and the inlet wave core ring (30) and between the wave shell (50) and the outlet wave core ring (40), so that when the wave shell (50) is subjected to complex bending deformation, forces are respectively transmitted to the inlet wave core ring (30) and the wave core ring (40) through two ends of the wave shell (50) to form side slopes,
The wave-shaped pressure-bearing device comprises a wave shell (50), a wave core body (70) and a rigid body ring (60), wherein the rigid body ring (60) is sleeved on the periphery of the wave shell (50), two ends of the rigid body ring (60) are respectively connected with the outer wall surfaces of the inlet pressure short pipe (10) and the outlet pressure short pipe (20) in a sealing sleeved mode, at least one free end is arranged, the wave shell (50), the wave core body (70) and the rigid body ring (60) are combined to form a flexible high-strength tubular sealing telescopic pressure-bearing structure, and water pressure born by the wave shell (50) is safely and reliably transmitted to the rigid body ring (60) through the wave core body (70);
The wave core body (70) is arranged between the inward wave cavity (52) of the wave shell (50) and the rigid ring (60) in a blocking manner, and a relative elastic deformation gap is kept between the wave core body (70) and the inner wall surface of the inward wave cavity (52), so that when the wave shell (50) is subjected to complex stress and generates bending deformation, the force is transmitted to the rigid ring (60) through the wave core body (70), and the protection of a middle slope of the wave shell (50) is formed;
The outlet end of the inlet wave core ring (30) is a wedge-shaped slope surface arranged towards the outlet wave core ring (40), the outlet end of the inlet wave core ring (30) is welded and connected with the inlet end of the wave shell (50) in a sealing way, a wedge-shaped elastic change gap is reserved, so that the force born by the inlet end of the wave shell (50) is transmitted to the inlet wave core ring (30), the inlet end of the outlet wave core ring (40) is a wedge-shaped slope surface arranged towards the inlet wave core ring (30), and the inlet end of the outlet wave core ring (40) is welded and connected with the outlet end of the wave shell (50) in a sealing way, and a wedge-shaped elastic change gap is reserved, so that the force born by the outlet end of the wave shell (50) is transmitted to the inlet wave core ring (30);
The cross section of the wave core body (70) is in an inverted trapezoid, a round shape, an oval shape or a semicircular shape; the cross-sectional shape of the wave core (70) is matched with the cross-sectional shape of the elastic deformation gap of the inward wave cavity (52);
the expansion joint of the hydropower station pressure steel pipe sub-rigid structure further comprises a sealing ring (80) and a pressing mechanism, wherein the rigid ring (60) is provided with a fixed end and a free end, the fixed end of the rigid ring (60) is welded with the outer wall surface of the inlet pressure short pipe (10), and the free end of the rigid ring (60) is in sealing connection with the outer wall surface of the outlet pressure short pipe (20) through the pressing mechanism and the sealing ring (80);
The pressing mechanism is a pressing ring (90) positioned at one side of the free end of the rigid body ring (60), and the sealing ring (80) is clamped between the pressing ring (90) and the rigid body ring (60);
An inlet flange is arranged at the inlet end of the inlet pressure short pipe (10), and an outlet flange is arranged at the outlet end of the outlet pressure short pipe (20);
The expansion joint of the sub-rigid body structure of the hydropower station pressure steel pipe further comprises an antifriction ring (91) axially arranged in the inner cavity of the wave shell (50), a first end of the antifriction ring (91) is arranged on the side wall of the outlet end of the inlet pressure short pipe (10), a second gap (12) is arranged between a second end of the antifriction ring (91) and the side wall of the inlet end of the outlet pressure short pipe (20), and a third gap (13) is arranged between the outer wall surface of the antifriction ring (91) and an inward wave crest (53) of the wave shell (50).
2. The hydropower station pressure steel pipe sub-rigid body structure expansion joint according to claim 1, wherein,
The wave core body (70) is a vibration absorption and wear-resistant body, and the wave core body (70) is formed by wrapping a rigid material with a vibration absorption and wear-resistant material.
3. The hydropower station pressure steel pipe sub-rigid body structure expansion joint according to claim 2, wherein,
The wave core body (70) is divided into a plurality of blocks, and the wave core bodies (70) are divided into blocks along the circumferential direction of the rigid body ring (60) to fill the inward wave cavity (52) of the wave shell (50).
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| CN201910986038.3A CN110701412B (en) | 2019-10-17 | 2019-10-17 | Expansion joint of sub-rigid structure of hydropower station pressure steel pipe |
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| CN110701412A CN110701412A (en) | 2020-01-17 |
| CN110701412B true CN110701412B (en) | 2024-05-28 |
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| CN112032450A (en) * | 2020-07-23 | 2020-12-04 | 南昌航空大学 | Novel high-strength low-rigidity metal expansion joint |
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| CN211083251U (en) * | 2019-10-17 | 2020-07-24 | 长沙东屋机电有限责任公司 | Sub-rigid body structure expansion joint of pressure steel pipe of hydropower station |
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| GB1353566A (en) * | 1971-09-17 | 1974-06-05 | Pneumatiques Caoutchouc Mfg | Expansion joint for pipes |
| US6422611B1 (en) * | 1998-01-16 | 2002-07-23 | Jiesheng Jin | Contractible joint device for metal conduit |
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