CN110701412A - Sub-rigid body structure expansion joint of pressure steel pipe of hydropower station - Google Patents
Sub-rigid body structure expansion joint of pressure steel pipe of hydropower station Download PDFInfo
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- CN110701412A CN110701412A CN201910986038.3A CN201910986038A CN110701412A CN 110701412 A CN110701412 A CN 110701412A CN 201910986038 A CN201910986038 A CN 201910986038A CN 110701412 A CN110701412 A CN 110701412A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 62
- 239000010959 steel Substances 0.000 title claims abstract description 62
- 238000005452 bending Methods 0.000 claims abstract description 14
- 238000007789 sealing Methods 0.000 claims description 49
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 21
- 239000000463 material Substances 0.000 claims description 18
- 230000007246 mechanism Effects 0.000 claims description 10
- 230000005489 elastic deformation Effects 0.000 claims description 8
- 238000003466 welding Methods 0.000 claims description 6
- 238000010521 absorption reaction Methods 0.000 claims description 5
- 230000000903 blocking effect Effects 0.000 claims description 2
- 230000006835 compression Effects 0.000 claims 1
- 238000007906 compression Methods 0.000 claims 1
- 239000002184 metal Substances 0.000 description 10
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 230000008602 contraction Effects 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
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- 230000006872 improvement Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
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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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Abstract
The invention discloses a hydropower station pressure steel pipe sub-rigid body structure expansion joint, 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 for radially supporting the wave shell and a wave core body for transmitting medium pressure in the middle of the wave shell to the rigid body ring, wherein 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 bending deformation in a complex stress manner, 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 bodies are arranged between an inward wave cavity and the rigid body ring of the wave shell in a block manner, and a relative elastic gap is reserved 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 pressure steel pipe sub-rigid body structure expansion joint of the hydropower station has the advantages of good flexibility, large bearing force, 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 a conveying pipeline, in particular to a pressure steel pipe sub-rigid body structure expansion joint of a hydropower station.
Background
The metal pipeline for conveying material, especially the metal pipeline with larger pipe diameter or large pipe diameter and higher water pressure or ultrahigh water pressure, is easy to damage because of the displacement of the steel pipe caused by the physical property or natural environment of the conveyed material, especially the metal pipeline with larger pipe diameter or large pipe diameter and higher water pressure or ultrahigh water pressure. Therefore, a telescopic joint device (also called a telescopic joint) is required to be arranged at the joint of the metal pipelines to avoid damage caused by radial stress.
The traditional telescopic joint device has a simple structure, but has the defect of serious water leakage and cannot overcome the defect.
A non-hypo-rigid structure of a 'leakage-free pipeline expansion joint device' (publication number: CN2300785Y) disclosed in 12/16/1998 is shown in figure 1, and the device is provided with two short pipes (figure 1 shows a short pipe 1 and a short pipe 2) and a sleeve 3, wherein the joint ends of the two short pipes are both positioned in the sleeve, one end part of the sleeve 3 is connected with the pipe wall of one short pipe (figure 1 shows the short pipe 1), the inner wall surface of the other end part of the sleeve 3 is in fit contact with the outer wall surface of the other end part of the short pipe (figure 1 shows the short pipe 2), and a certain fit clearance 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 can slide relatively axially, a telescopic clearance 4 is arranged between the joint ends of the two short pipes, a corrugated pipe section 5 is arranged in the telescopic. The technical problem that the traditional sleeve type expansion joint device seriously leaks water is solved, the metal pipeline with low water head and small pipe diameter can be ensured not to leak, but because the corrugated core body which radially supports and transmits radial force is lacked, when the device is used for a pressure steel pipe with large pipe diameter and higher pressure, the corrugated pipe needs to bear corresponding large radial force, under the condition, the corrugated pipe section of the thin shell structure generates excessive outward bulging deformation due to bearing excessive radial force, so that the connecting part of the body and the short pipe is easy to damage, and the service life of the corrugated pipe section of the thin shell type is short.
Although the existing telescopic joint device overcomes the technical problem that when the 'non-leakage pipeline telescopic joint device' is used for a large-diameter and high-pressure steel pipe, a corrugated pipe section bulges outwards to deform, and the leakage of the large-diameter and high-pressure metal pipeline can be avoided, the existing telescopic joint device does not protect a middle slope and a side slope of a wave shell, so that the technical problems that the structure of the telescopic joint device is easy to damage, the bearing force is small and the service life is short are caused.
Disclosure of Invention
The invention provides a telescopic joint of a pressure steel pipe sub-rigid body structure of a hydropower station, which aims to solve the technical problems of easy damage, small bearing force and short service life of the traditional telescopic joint device structure.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a pressure steel pipe sub-rigid body structure expansion joint for a hydropower station 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 for radially supporting the wave shell and a wave core body for transmitting medium pressure in the middle of the wave shell to the rigid body ring, wherein the inlet pressure short pipe and the outlet pressure short pipe are oppositely arranged, the inlet wave core ring is welded and sealed on the end surface of the outlet end of the inlet pressure short pipe, the outlet wave core ring is welded and sealed on the end surface of the inlet end of the outlet pressure short pipe, an axial expansion gap is arranged between the inlet wave core ring and the outlet wave core ring, the wave shell is axially arranged in the axial expansion gap, the two ends of the wave shell are respectively connected with the inlet wave core ring and the outlet wave core ring through welding and sealing, and elastic variable gaps are reserved between the wave shell and the inlet wave core ring as well as between the wave shell and the outlet wave core ring, when the wave shell is subjected to complex stress and generates 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 rigid body ring is sleeved on the periphery of the wave shell, two ends of the rigid body ring are connected with the outer wall surfaces of the inlet pressure short pipe and the outlet pressure short pipe in a sealing and sleeving manner respectively 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 water pressure borne by the wave shell is safely and reliably transmitted to the rigid body ring through the wave core body; the wave core body is arranged between the inward wave cavity and the rigid ring of the wave shell in a partitioning mode, and a relative elastic variable 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 bending deformation due to complex stress, force is transmitted to the rigid ring through the wave core body, and the protection of a middle slope of the wave shell is formed.
Further, the exit end of entry wave core ring is for the wedge domatic towards wave core ring setting, the exit end of entry wave core ring and the entry end welded seal of ripples casing connect and leave the wedge and play the clearance so that transmit the power that the entry end of ripples casing received to wave core ring, the entry end of export wave core ring is for the wedge domatic towards wave core ring setting, the entry end of export wave core ring and the exit end welded seal of ripples casing connect and leave the wedge and play the clearance so that transmit the power that the exit end of ripples casing received to wave core ring.
Furthermore, the massive wave core body is a vibration absorption wear-resistant body, and the wave core body is formed by wrapping a rigid material by a vibration absorption 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 shape of the cross section of the wave core body is matched with the shape of the cross section of the elastic deformation gap of the inward wave cavity.
Furthermore, the wave core bodies are multiple and are filled in the inward wave cavity of the wave shell along the circumferential blocks of the rigid ring.
Furthermore, the power station pressure steel pipe sub-rigid body structure expansion joint further comprises a sealing ring and a pressing mechanism, the rigid body ring is provided with a fixed end and a free end, the fixed end of the rigid body ring is welded with the outer wall surface of the inlet pressure short pipe, and the free end of the rigid body ring is connected with the outer wall surface of the outlet pressure short pipe in a sealing mode through the pressing mechanism and the sealing ring.
Furthermore, the pressing mechanism is a pressing ring positioned on one side of the free end of the rigid body ring, and the sealing ring is clamped between the pressing ring and the rigid body ring.
Furthermore, an inlet flange plate is arranged at the inlet end of the inlet pressure short pipe, and an outlet flange plate is arranged at the outlet end of the outlet pressure short pipe.
Furthermore, the power station pressure steel pipe inferior rigid body structure telescopic joint still includes the ring that wear-resistants of locating the inner chamber of ripples casing along the axial, and the first end of ring that wear-resistants is located on the lateral wall of the exit end of entry pressure nozzle stub, is equipped with the second clearance between the second end of ring that wear-resistants and the lateral wall of the entry end of exit pressure nozzle stub, is equipped with the third clearance between the outer wall of ring that wear-resistants and the interior wave crest of ripples casing.
The invention has the following beneficial effects:
according to the pressure steel pipe sub-rigid body structure expansion joint of the hydropower station, an axial expansion gap is arranged between an inlet wave core ring and an outlet wave core ring, a wave shell is arranged in the axial expansion gap along the axial direction, the rigid body ring is sleeved on the periphery of the wave shell, and two ends of the rigid body ring are respectively in sealing connection with the outer wall surfaces of an inlet pressure short pipe and an outlet pressure short pipe, so that the connection of the inlet wave core ring and the inlet pressure short pipe and the connection of the outlet wave core ring and the outlet pressure short pipe are both positioned in the sleeved area of the rigid body ring, the sealing protection of the rigid body ring is obtained, and the damage of the connection position due to external factors is prevented; the wave shell, the inlet wave core ring and the outlet wave core ring are connected in a sealing way to form a first layer of elastic sealing layer, and the rigid ring, the inlet pressure short pipe and the outlet pressure short pipe are connected in a sealing way to form a second layer of rigid sealing layer, so that the wave shell is protected in a double-layer sealing way, and mutual sealing interference and movement obstruction cannot be formed, and a double stable sealing combined structure is formed; the two ends of the wave shell are respectively connected with the inlet wave core ring and the outlet wave core ring in a sealing mode through welding, 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 bending deformation due to complex stress, force is respectively transmitted to the inlet wave core ring and the outlet wave core ring through the two ends of the wave shell, and slope protection is formed for the two ends of the wave shell; the wave core body is arranged between an inward wave cavity and a rigid body ring of a wave shell in a partitioning manner, elastic and variable gaps are reserved between the wave shell and an inlet wave core ring and between the wave shell and an outlet wave core ring, so that when the wave shell is subjected to complex stress and generates 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, a relative elastic and variable gap is reserved 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, radial medium pressure borne by the wave shell body can be transmitted to the rigid body ring, the wave shell body is prevented from being damaged, a hydraulic power station pressure steel pipe substructure rigid body telescopic joint is good in flexibility, large in bearing force, zero leakage and long in service life; and because the power station pressure steel pipe sub-rigid body structure expansion joint mainly comprises the wave shell, the wave core and the rigid body ring, the wave shell, the wave core and the rigid body ring are combined to form a flexible high-strength tubular sealed expansion bearing structure, the water pressure borne by the wave shell in the pipe is safely and reliably transmitted to the rigid body ring through the wave core, and the wall thickness of the rigid body ring is designed according to the design specifications of the pressure steel pipe, the power station pressure steel pipe sub-rigid body structure expansion joint has the bearing capacity with the same PD value (design pressure value) as the set pressure steel pipe, and the fully sealed metal wave shell structure of the hydropower station pressure steel pipe sub-rigid body structure expansion joint enables the power station pressure steel pipe sub-rigid body structure expansion joint to have good expansion and contraction changing capacity and achieve different sealing effects of fully sealed water dripping, thereby thoroughly solving the problem of water leakage of the transmission expansion joint.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and are not intended to limit the invention. In the drawings:
FIG. 1 is a schematic view of a "leak-free pipe expansion joint device";
FIG. 2 is a schematic structural diagram of a sub-rigid structure 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.
Illustration of the drawings:
100. a power station pressure steel pipe sub-rigid body structure expansion joint; 10. an inlet pressure spool; 11. a spring-to-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 core ring; 50. a wave housing; 51. outward wave crest; 52. an inward wave cavity; 53. inward wave crest; 60. a rigid ring; 70. a wave core body; 71. a rigid member; 72. a wear part; 80. a seal ring; 90. pressing a ring; 91. an antiwear ring.
Detailed Description
The embodiments of the invention will be described in detail below with reference to the accompanying drawings, but the invention can be embodied in many different forms, which are defined and covered by the following description.
FIG. 1 is a schematic view of a "leak-free pipe expansion joint device"; FIG. 2 is a schematic structural diagram of a pressure steel pipe sub-rigid body structure expansion joint of a hydropower station according to a preferred embodiment of the invention; fig. 3 is an enlarged view at a in fig. 2. The arrows in fig. 3 indicate the medium flow direction.
As shown in fig. 2 and 3, the telescopic joint 100 of a sub-rigid structure of a pressure steel pipe in a hydropower station of the present embodiment includes an inlet pressure short pipe 10, an outlet pressure short pipe 20, an inlet core ring 30, an outlet core ring 40, a wave shell 50, a rigid ring 60 for radially supporting the wave shell 50, and a wave core body 70 for transmitting medium pressure in the middle of the wave shell 50 to the rigid ring 60, the inlet pressure short pipe 10 and the outlet pressure short pipe 20 are oppositely disposed, the inlet core ring 30 is welded and hermetically connected to an end surface of an outlet end of the inlet pressure short pipe 10, the outlet core ring 40 is welded and hermetically connected to an end surface of an inlet end of the outlet pressure short pipe 20, an axial telescopic gap 31 is provided between the inlet core ring 30 and the outlet core ring 40, the wave shell 50 is axially disposed in the axial telescopic gap 31, two ends of the wave shell 50 are respectively welded and hermetically connected to the inlet core ring 30 and the outlet core ring 40, 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 bending deformation in a complex stress manner, force is transmitted to the inlet wave core ring 30 and the outlet wave core ring 40 through two ends of the wave shell 50 respectively to form slope protection for two ends of the wave shell 50, the rigid body ring 60 is sleeved on the periphery of the wave shell 50, two ends of the rigid body ring 60 are connected with the outer wall surfaces of the inlet pressure short pipe 10 and the outlet pressure short pipe 20 in a sealing sleeved manner and are provided with at least one free end, the wave shell 50, the wave core body 70 and the rigid body ring 60 are combined to form a flexible high-tubular-strength sealing telescopic pressure-bearing structure, and water pressure borne by the wave shell 50 is safely and reliably transmitted to the rigid body ring 60 through the wave core; 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 mode, and a relative elastic variable 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 bending deformation, force is transmitted to the rigid ring 60 through the wave core body 70, and the protection of the middle slope of the wave shell 50 is formed. According to the hydropower station pressure steel pipe sub-rigid body structure expansion joint 100, 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 rigid body ring 60 is sleeved on the periphery of the wave shell 50, and two ends of the rigid body ring 60 are respectively in sealing connection with the outer wall surfaces of the inlet pressure short pipe 10 and the outlet pressure short pipe 20, so that the connection of the inlet wave core ring 30 and the inlet pressure short pipe 10 and the connection of 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 connection part is prevented from being damaged due to external factors; the wave shell 50, the inlet wave core ring 30 and the outlet wave core ring 40 are connected in a sealing mode to form a first elastic sealing layer, and the rigid ring 60, the inlet pressure short pipe 10 and the outlet pressure short pipe 20 are connected in a sealing mode to form a second rigid sealing layer, so that the wave shell 50 is protected in a double-layer sealing mode, mutual sealing interference and movement obstruction cannot be formed, and a double stable sealing combined structure is formed; the 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 way 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 bending deformation in a complex stress manner, force is respectively transmitted to the inlet wave core ring 30 and the outlet wave core ring 40 through the two ends of the wave shell 50, and slope protection is formed on the two ends of the wave shell 50; is segmented by a wave core body 70 between the inward wave cavity 52 of the wave housing 50 and the rigid ring 60, and elastic gaps are left 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 respectively transmitted to the inlet wave core ring 30 and the outlet wave core ring 40 through two ends of the wave shell 50, a relative elastic 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 bending deformation is generated, the force is transmitted to the rigid ring 60 through the wave core body 70 to form protection for the middle slope of the wave shell 50, the radial medium pressure borne by the wave shell 50 can be transmitted to the rigid ring 60, so that the wave shell 60 is prevented from being damaged, and the pressure steel pipe sub-rigid structure expansion joint 100 of the hydropower station has the advantages of good flexibility, large bearing capacity, zero leakage and long service life; moreover, since the hydropower station pressure steel pipe sub-rigid structure expansion joint 100 mainly comprises the wave shell 50, the wave core body 70 and the rigid ring 60, the wave shell 50, the wave core body 70 and the rigid ring 60 are combined to form a flexible high-strength tubular sealed expansion pressure-bearing structure, the water pressure borne by the pipe wave shell 50 is safely and reliably transmitted to the rigid ring 60 through the wave core body 70, the wall thickness of the rigid ring 60 is designed according to the design specification of the pressure steel pipe, so that the power station pressure steel pipe sub-rigid structure expansion joint 100 has the bearing capacity of the same PD value design pressure value as the established pressure steel pipe, the power station pressure steel pipe sub-rigid structure expands and contracts, and the fully-sealed metal wave shell structure of the power station pressure steel pipe sub-rigid structure expansion joint 100 enables good expansion and contraction to be changed into capacity, achieves different sealing effects of fully-sealed water dripping, and thoroughly solves the problem of water leakage of the transmission expansion joint.
The hydropower station pressure steel pipe sub-rigid body structure expansion joint can be used for connecting water diversion steel pipe sections of a hydropower station and connecting the water diversion steel pipe sections with the inlet ends of water wheel volutes, and can be used for connecting the inlet ends of the expansion joints with different pipe diameters and different liquid medium oil and water with the pressure steel pipes of the hydropower station.
It is understood that the wave housing 50 may be a corrugated pipe, and the number of the corrugated sections of the wave housing 50 may be one section or multiple sections, and is set according to the actual use situation.
Preferably, the inlet core ring 30, the outlet core ring 40 and the wave housing 50 are made of the same material, so that the inlet pressure stub 10 and the outlet pressure stub 20 are connected in a sealed 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 the two ends of the thin and soft wave shell are made of the same material, the consistency of materials guarantees the corrosion resistance and the service life of the joints at the two ends of the wave shell 50, and simultaneously, the two ends of the wave shell 50 with thin thickness and soft surface are prevented from being directly welded with the inlet pressure short pipe 10 and the outlet pressure short pipe 20 which are made of different materials, so that the wave shell 50 is prevented from being damaged during welding, the corrosion resistance and the structural performance of the wave shell 50 are improved, and the service life of the pressure steel pipe sub-rigid body structure expansion joint 100 of the hydropower station is prolonged. In this embodiment, the inlet core ring 30, the outlet core ring 40 and the corrugated shell 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 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 in fit contact with the outer wall surfaces of the inlet pressure short pipe 10 and the outlet pressure short pipe 20, and a certain fit clearance is reserved, namely, a certain radial fit 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 when the free end of the rigid ring 60 can slide along the axial direction, the rigid ring 60 plays a rigid supporting role on the wave shell 50 when the wave shell 50 is expanded and deformed outwards under the action of radial pressure because the outward wave crest 51 of the wave shell 50 is in contact with or tends to be in contact with the inner wall surface of the rigid ring 60; because the axial telescopic gap 31 is arranged between the inlet wave core ring 30 and the outlet wave core ring 40, the wave shell 50 is arranged in the axial telescopic gap 31 along the axial direction, 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 way, and the wave shell 50 arranged in the axial telescopic gap 31 has axial scalability under the action of external force, the sealing performance of the hydropower station pressure steel pipe sub-rigid body structure expansion joint 100 is ensured, the axial telescopic of a metal pipeline caused by the influence of temperature can be met, and the axial stress of the pipeline is effectively eliminated.
It can be understood that the invention is mainly used for medium-sealed pressure steel pipes, the wave shell 50 is a flexible part with telescopic dislocation and bending deformation, the force transmission part of the wave core body 70, and the wave core ring 40 is a force bearing part.
It can be understood that, in the present embodiment, the two ends of the wave housing 50 are respectively welded to the side walls of the inlet core ring 30 and the outlet core ring 40 by the deformed steel, and since the thickness of the side wall surfaces of the inlet core ring 30 and the outlet 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, the sealing performance of the hydraulic power station pressure steel pipe sub-rigid body structure expansion joint 100 is ensured, and at the same time, the influence on the corrosion resistance of the hydraulic power station pressure steel pipe sub-rigid body structure expansion joint 100 is small.
It should be understood that the wave core body 70 is disposed between the inward wave cavity 52 of the wave housing 50 and the rigid ring 60, and the wave core body 70 may be disposed in the inward wave cavity 52 of the wave housing 50, an outer wall of the wave core body 70 abuts against an inner wall surface of the rigid ring 60, and an inner wall of the wave core body 70 is disposed toward a surface of the wave housing 50 and has an elastic gap 11 with the inner wall surface of the inward wave cavity 52. By providing the elastically deformable gap 11, the space for elastic deformation of the inward wave cavity 52 is ensured when the telescopic tube is subjected to axial and/or radial forces. It can be understood that the elastically deformable gap 11 is a deformation gap that is generated in the elastic deformation range of the inward wave cavity 52, that is, the inward wave cavity 52 generates an elastic deformation in the elastically deformable gap 11 that does not damage the structure of the inward wave cavity 52, specifically, by providing the wave core 70 that radially supports the wave housing 50, when the inward wave cavity 52 is subjected to a large radial pressure, the top of the inner wall surface of the inward wave cavity 52 contacts the surface of the wave core 70, the wave core 70 rigidly supports the inward wave cavity 52, and the radial force is transmitted and 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 a radial deformation in the elastically deformable gap 11, the elastic deformation of the inward wave cavity 52 is within a tolerable range, so as to prevent the wave housing 50 from being damaged, and ensure the stability and reliability of the operation of the apparatus. It will be appreciated that by providing the rigid ring 60 and the wave core 70 to act as a rigid support for the wave housing 50, the stability of the wave housing 50 when subjected to radial compressive forces is greatly improved, and the thickness of the wave housing 50 can be reduced to improve the effect of the stress on the wave housing 50.
Further, the outlet end of the inlet core-wave ring 30 is a wedge-shaped slope surface arranged towards the core-wave ring 40, the outlet end of the inlet core-wave ring 30 is welded and sealed with the inlet end of the core-wave housing 50 and is provided with a wedge-shaped elastic gap so as to transmit the force received by the inlet end of the core-wave housing 50 to the core-wave ring 30, the inlet end of the outlet core-wave ring 40 is a wedge-shaped slope surface arranged towards the core-wave ring 30, and the inlet end of the outlet core-wave ring 40 is welded and sealed with the outlet end of the core-wave housing 50 and is provided with a wedge-shaped elastic gap so as to transmit the force received by the outlet end of the core-wave housing 50. Through the cooperation of the slope surfaces of the side slopes at the two ends of the wave shell 50 and the wedge-shaped slope surfaces, a multidirectional elastic support is formed, and the side slopes at the two ends of the wave shell 50 are protected.
It can be understood that the connecting end surface of the outlet end of the inlet core ring 30 is an arc structure which is matched with the arc curved surface of the inlet end of the wave shell 50, the connecting end surface of the inlet end of the outlet core ring 40 is an arc structure which is matched with the arc curved surface of the outlet end of the wave shell 50, so that the end portions of the bent end of the inlet core ring 30 and the bent end of the outlet core ring 40 are fixedly connected with the arc end portion of the arc structure of the wave shell 50 in a sealing manner, and the bent end of the inlet core ring 30 and the bent end of the outlet core ring 40 and the arc portion of the arc structure have the above-mentioned wedge-shaped elastic deformation gap, and form an elastic strain field. When carrying out sealing connection through circular arc structure increase area of contact and ripples casing 50's both ends, owing to be equipped with the deformation clearance, can make entry ripples core ring 30 and export ripples core ring 40 play the effect of rigid support to ripples casing 50, the entry end and the exit end of elastic support ripples casing 50, when ripples casing 50 takes place deformation along axial or radially, guaranteed the sealing performance of ripples casing 50 and the stability of connecting, when the protection to ripples casing 50 midslope, increased the protection to ripples casing 50 side slope. It is understood that the circular arc mechanism may be a multi-curved circular arc surface structure.
Specifically, the inlet core ripple ring 30 is welded and hermetically connected to the end face of the outlet end of the inlet pressure short pipe 10, the outlet core ripple ring 40 is welded and hermetically connected to the end face of the inlet end of the outlet pressure short pipe 20, so that the inlet core ripple ring 30 and the inlet pressure short pipe 10 form an integral ring structure, the outlet core ripple ring 40 and the outlet pressure short pipe 20 form an integral ring structure, so that the inlet core ripple ring 30 and the outlet core ripple ring 40 support the two ends of the ripple shell 50, hydraulic force at the end of the ripple shell 50 can be transmitted to the inlet core ripple ring 30 and the outlet core ripple ring 40 at the two ends of the ripple shell 50, and the inlet core ripple shell ring 30 and the outlet core ripple core ring 40 are received by the integral ring structure with sufficient strength, so that the ripple shell 50 is prevented from further tensile elongation, the end of the ripple shell 50 is protected, and the end of.
Further, the massive core body 70 is a shock-absorbing wear-resistant body, and the core body 70 is formed by wrapping a rigid material with a shock-absorbing wear-resistant material. It will be appreciated that the first end of the wave core 70 bears against the inner wall surface of the rigid ring 60 and the second end of the wave core 70 is disposed towards the surface of the wave housing 50 leaving a spring gap 11 with the surface of the inward wave cavity 52. Specifically, the vibration absorption wear-resistant material can be a cushion pad or a high polymer wear-resistant material which can slightly deform, such as a high polymer rubber pad, a high polymer plastic pad, a corrugated cushion, an elastic pad and the like; by compressing and deforming the wear-resistant member 72 made of the shock-absorbing wear-resistant material to the rigid member 71 made of the rigid material when the wave core body 70 is compressed, sudden stress change of the wave housing 50 is prevented, the wave housing 50 is prevented from being damaged, and the service life of the wave housing 50 is prolonged.
Further, the cross-sectional shape of the wave core body 70 is an inverted trapezoid, a circle, an ellipse, or a semicircle.
More preferably, the cross-sectional shape of the wave core body 70 matches the cross-sectional shape of the elastically deformable gap of the inwardly-facing wave cavity 52. The inward wave cavity 52 may be provided with a plurality of force bearing points to maintain the structural integrity of the inward wave cavity 52 when the inward wave cavity 52 is deformed by a force.
More preferably, the wave core body 70 is provided in a plurality of pieces, and the plurality of wave core bodies 70 block-fill the inward wave cavity 52 of the wave housing 50 in the circumferential direction of the rigid body ring 60. Specifically, the plurality of wave cores 70 are arranged at uniform intervals or uniformly and closely along the circumferential direction of the rigid ring 60. It is understood that the number of the wave core bodies 70 may be four, six, or other numbers.
Furthermore, the pressure steel pipe sub-rigid body structure expansion joint of the hydropower station further comprises a sealing ring 80 and a pressing mechanism, the rigid body ring 60 is provided with a fixed end and a free end, the fixed end of the rigid body ring 60 is welded with the outer wall surface of the inlet pressure short pipe 10, and the free end of the rigid body ring 60 is connected with the outer wall surface of the outlet pressure short pipe 20 in a sealing manner 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 body ring 60, and the seal ring 80 is provided between the pressing ring 90 and the rigid body ring 60. It will be appreciated that the pressure ring may be welded to the free end of the rigid body ring 60 or may be connected to the free end of the rigid body ring 60 by snap-fit, bolting, or the like. 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 may be left between an end surface of the pressure ring 90 and an end surface of the free end of the rigid body ring 60. By fixedly connecting one end of the rigid ring 60 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 axially compressed or stretched immediately.
Further, 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 power station pressure steel pipe sub-rigid body structure expansion joint 100 is connected with an adjacent pipeline through a flange, so that the assembly, disassembly, maintenance and replacement are facilitated, and leakage reasons are conveniently found by opening the expansion joint.
Further, the power station pressure steel pipe sub-rigid structure telescopic joint 100 further comprises an anti-wear ring 91 axially arranged in the inner cavity of the wave shell 50, a first end of the anti-wear 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 anti-wear 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 anti-wear ring 91 and the inward wave crest 53 of the wave shell 50. It can be understood that, in the present embodiment, by providing the anti-wear ring 91, the wear of the medium to the inner wall surface of the wave housing 50 can be effectively reduced, the service life of the wave housing 50 can be prolonged, by providing the second gap 12, the displacement requirement of the rigid ring 60 moving in the axial direction can be satisfied, and by providing the third gap 13, the space required for the corrugated section of the wave housing 50 to deform in the radial direction when compressed can be satisfied.
The invention also provides a hydropower station, which comprises the pressure steel pipe sub-rigid body structure expansion joint 100 of the hydropower station.
In specific implementation, a telescopic joint 100 of a sub-rigid body structure of a pressure steel pipe of a hydropower station is provided, the interface end of an inlet pressure short pipe 10 and an inlet wave core ring 30 and the interface end of an outlet pressure short pipe 20 and an outlet wave core ring 40 are both located in a rigid body 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 both ends are both located in the rigid body ring 60, an outward wave crest 51 of the wave shell 50 contacts the inner wall surface of the rigid body ring 60, a wave core body 70 is arranged in an inward wave cavity 52 of the wave shell 50, and an elastic variable gap 11 is arranged between the wave core body 70 and the inward wave cavity 52. Two ends of the rigid 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 two ends of the rigid ring 60 are free ends, or one end is a free end, and the other end is connected with the corresponding inlet pressure short pipe 10 or outlet pressure short pipe 20; the wave housing 50 can be made flexible to accommodate the expansion and contraction of the inlet pressure spool 10 and/or outlet pressure spool 20. When the wave shell 50 bears the radial internal water pressure, the rigid ring 60, the wave core body 70, the inlet wave core ring 30 and the outlet wave core ring 40 which are arranged on two sides of the wave shell 50 support the wave shell rigidly, and the sub-rigid structure with the flexibility and the force bearing rigidity meets the reliable design and application of various hydraulic power station pressure steel pipes, particularly large-diameter and high-water-head pressure steel pipe telescopic joints. Another function of inlet core ring 30 and outlet core ring 40 is to ensure corrosion life of the joint with wave housing 50 due to the consistency of materials between wave housing 50 and inlet core ring 30 and between wave housing 50 and outlet core ring 40.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An expansion joint of a pressure steel pipe sub-rigid body structure of a hydropower station 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) for radially supporting the wave shell (50) and a wave core body (70) 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 sealed on the end face of the outlet end of the inlet pressure short pipe (10), the outlet wave core ring (40) is welded and sealed on the end face of the inlet end of the outlet pressure short pipe (20), an axial telescopic 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 telescopic 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 welding and sealing manner, and elastic variable 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 bending deformation due to complex stress, force is transmitted to the inlet wave core ring (30) and the outlet wave core ring (40) through two ends of the wave shell (50) respectively to form slope protection for two ends of the wave shell (50),
the rigid ring (60) is sleeved on the periphery of the wave shell (50), two ends of the rigid 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 body (70) and the rigid ring (60) are combined to form a flexible high-strength tubular sealing telescopic pressure-bearing structure, and water pressure borne by the wave shell (50) is safely and reliably transmitted to the rigid 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 mode, a relative elastic 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 bending deformation in a complex stress mode, 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.
2. The sub-rigid body structure expansion joint of a pressure steel pipe of a hydropower station according to claim 1,
the outlet end of the inlet wave core ring (30) is a wedge-shaped slope surface arranged towards the wave core ring (40), the outlet end of the inlet wave core ring (30) is welded and hermetically connected with the inlet end of the wave shell (50) and is provided with a wedge-shaped elastic variable gap so as to transmit the force applied to the inlet end of the wave shell (50) to the wave core ring (30),
the inlet end of the outlet wave core ring (40) is a wedge-shaped slope surface arranged towards the wave core ring (30), and the inlet end of the outlet wave core ring (40) is welded and hermetically connected with the outlet end of the wave shell (50) and is provided with a wedge-shaped elastic variable gap so as to transmit the force applied to the outlet end of the wave shell (50) to the wave core ring (30).
3. The sub-rigid body structure expansion joint of a pressure steel pipe of a hydropower station according to claim 2,
the blocky wave core body (70) is a vibration absorption wear-resistant body, and the wave core body (70) is formed by wrapping a rigid material by a vibration absorption wear-resistant material.
4. The sub-rigid body structure expansion joint of a pressure steel pipe of a hydropower station according to claim 3,
the wave core body (70) is in the shape of an inverted trapezoid, a circle, an ellipse or a semicircle in cross section.
5. The sub-rigid body structure expansion joint of a pressure steel pipe of a hydropower station according to claim 3,
the shape of the cross section of the wave core body (70) is matched with the shape of the cross section of the elastic deformation gap of the inward wave cavity (52).
6. The sub-rigid body structure expansion joint of a pressure steel pipe of a hydropower station according to claim 5,
a plurality of said wave core bodies (70), said plurality of said wave core bodies (70) filling said inward wave cavity (52) of said wave housing (50) in segments along the circumference of said rigid ring (60).
7. The sub-rigid body structure expansion joint of a pressure steel pipe of a hydropower station according to claim 6,
the power station pressure steel pipe sub-rigid body structure expansion joint 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 connected with the outer wall surface of the outlet pressure short pipe (20) in a sealing mode through the compression mechanism and the sealing ring (80).
8. The sub-rigid body structure expansion joint of a pressure steel pipe of a hydropower station according to claim 7,
the pressing mechanism is a pressing ring (90) located on one side of the free end of the rigid ring (60), and the sealing ring (80) is clamped between the pressing ring (90) and the rigid ring (60).
9. The sub-rigid body structure expansion joint of a pressure steel pipe of a hydropower station according to claim 8,
an inlet flange plate is arranged at the inlet end of the inlet pressure short pipe (10), and an outlet flange plate is arranged at the outlet end of the outlet pressure short pipe (20).
10. The sub-rigid body structure expansion joint of a pressure steel pipe of a hydropower station according to claim 9,
power station pressure steel pipe inferior rigid body structure telescopic joint still includes to be located along the axial ring (91) of wearing of the inner chamber of ripples casing (50), the first end of ring (91) of wearing is located on the lateral wall of the exit end of entry pressure nozzle stub (10), wear the second end of ring (91) with be equipped with second clearance (12) between the lateral wall of the entry end of exit pressure nozzle stub (20), wear the outer wall of ring (91) with be equipped with third clearance (13) between the inward wave crest (53) of ripples casing (50).
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| Application Number | Priority Date | Filing Date | Title |
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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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| 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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| CN110701412B CN110701412B (en) | 2024-05-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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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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