CN114636040B - Bidirectional reinforced electric melting pipe fitting and mounting method thereof - Google Patents
Bidirectional reinforced electric melting pipe fitting and mounting method thereof Download PDFInfo
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- CN114636040B CN114636040B CN202210534609.1A CN202210534609A CN114636040B CN 114636040 B CN114636040 B CN 114636040B CN 202210534609 A CN202210534609 A CN 202210534609A CN 114636040 B CN114636040 B CN 114636040B
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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
- F16L47/00—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics
- F16L47/02—Welded joints; Adhesive joints
- F16L47/03—Welded joints with an electrical resistance incorporated in the joint
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
- B29C65/3472—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the composition of the heated elements which remain in the joint
- B29C65/3476—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the composition of the heated elements which remain in the joint being metallic
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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
- F16L47/00—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics
- F16L47/14—Flanged joints
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Branch Pipes, Bends, And The Like (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
- Mutual Connection Of Rods And Tubes (AREA)
- Clamps And Clips (AREA)
Abstract
A bidirectional reinforced electric melting pipe fitting and an installation method thereof comprise the following steps: the pipe fitting comprises a pipe fitting body, wherein a pipe fitting middle part and two pipe fitting pressure bearing parts positioned on two sides are formed in the pipe fitting body along the axial direction, the pipe fitting middle part is provided with a wall thickness not smaller than that of the pipe fitting pressure bearing parts, and one side of each pipe fitting pressure bearing part, which is close to the pipe fitting middle part along the radial direction, is provided with a thickness larger than that of two end parts of the pipe fitting body; the pipe fitting body further comprises a bidirectional reinforcing piece, the bidirectional reinforcing piece is provided with a pressing part and a clamping device, and the pressing part is provided with an inner surface matched with the outer surface of the pipe fitting pressure-bearing part; the gripping device is configured to cause the bidirectional reinforcement to exert pressure on the tubular body in both an axial direction and a radial direction when gripping. According to the invention, through the design of the bidirectional reinforced electric melting pipe fitting, the annular and radial bidirectional reinforcement of the electric melting joint is realized, the bulge failure of the end part can be prevented, and the reliability of the electric melting joint is effectively improved.
Description
Technical Field
The invention relates to the field of thermoplastic electric melting pipe fittings, in particular to a bidirectional reinforced electric melting pipe fitting and an installation method thereof.
Background
In the connection technology of plastic pipelines, the electrofusion welding has the advantages of relatively low equipment investment, relatively low maintenance cost, convenient operation, high reliability of welded junctions and the like, and is a common pipeline connection technology at present. The electric melting welding machine is connected with a binding post of an electric melting key, and the outer wall surface of the pipe is connected with the electric melting pipe together in a melting way by utilizing heat and expansion force generated when a resistance wire in the electric melting pipe is electrified. With the development of plastic and composite pipelines thereof towards high pressure, the overall pressure bearing capacity of the pipelines needs to be improved urgently. Analysis of the cause of Pipe system failure by ppdcc (plastic Pipe Database committee), usa, revealed that about 53% of Pipe failures occurred at the Pipe fittings.
Research by an inventor group finds that the polyethylene electric melting joint mainly bears internal pressure and axial force in the service process, and under the working condition, the joint failure modes can be divided into three types: electrofusion sleeve failure, fusion zone failure, and end tubing failure. Further subdivided, the fused sleeve failure can be classified as a through crack failure along the fused sleeve wall and a fused sleeve strength failure; wherein the through crack failure along the wall of the electric melting sleeve is mainly caused by slow crack propagation of a polyethylene material, and the angle of crack propagation and the axial included angle are concentrated at 70-75 degrees. The failure of the welding area can be divided into pulling-out failure and leakage failure; the pull-out failure refers to failure caused by axial pull-out of the pipe from the electric melting sleeve, and the leakage failure is mostly caused by defects of cold welding, oxide skin and the like during welding. End pipe failure can be divided into joint end bulging failure and pipe strength failure; the bulging failure at the end part of the joint is a failure mode aiming at the RTP pipe electric melting joint, and after long-time bearing, the pipe generates bulging deformation and cracking near the joint.
At present, in order to improve the structural strength of the electric melting pipe fitting, the following two modes are mainly adopted: the steel reinforcing layer is arranged in the electric melting pipe fitting, and the fiber reinforcing layer is arranged in the electric melting pipe fitting, but the defects which are difficult to overcome exist. For example, in a Chinese patent application 'a steel wire welding enhanced electric melting pipe fitting' (CN 215258475U), metal steel serving as a reinforcing material is a polar material, plastic matrixes such as polyethylene and polypropylene serving as matrix materials are mostly non-polar materials, although steel plates are replaced by steel wires for reinforcement, the bonding effect of the reinforcing material and the matrix materials is improved to a certain extent, interface failure still easily occurs, so that the two materials cannot be cooperatively borne, the reinforcing effect of the electric melting pipe fitting with the built-in steel is reduced, and meanwhile, the electric melting pipe fitting is complex in processing technology, high in manufacturing cost and difficult to popularize and apply. Moreover, like the Chinese patent application of 'a fiber reinforced electric melting pipe fitting' (CN 202302521U), the outer wall of the electric melting pipe fitting is wound with reinforced fibers, so that the pressure bearing capacity of the pipe fitting can be improved, and meanwhile, the operation is simple, the production cost is low, but the conveying requirement of the high-pressure pipe fitting is difficult to achieve; and Chinese patent application 'a middle and high voltage lining fibre soaks PE compound reinforcing electric smelting pipe fitting' (CN 203671067U) in the electric smelting pipe fitting embedding fibre enhancement layer, both increased the wholeness and increased the bearing capacity of pipe fitting and improved the reliability of middle and high voltage tubular product, but still have manufacturing process complicacy, cost scheduling problem. In addition, the above-mentioned problems are solved to some extent by the fiber-reinforced electrofusion flange joint (CN 214466942U) as in the chinese patent application, but the fiber-reinforced electrofusion flange joint cannot prevent the circumferential expansion of the integral fusion-welded zone.
Therefore, a bidirectional reinforced electric melting pipe fitting needs to be designed, the annular and radial bidirectional reinforcement of the electric melting joint is realized, the end bulging failure is prevented, and the reliability of the electric melting joint is effectively improved.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a novel bidirectional reinforced electric melting pipe fitting and an installation method thereof aiming at the field of thermoplastic electric melting pipe fittings.
In order to solve the technical problems, the solution provided by the invention is as follows:
the invention provides a bidirectional reinforced electric melting pipe fitting, which is characterized by comprising: a tube body and a bi-directional reinforcement;
the pipe fitting body is provided with a hollow part suitable for receiving a pipeline, the inner wall of the pipe fitting body is provided with a resistance wire for electrofusion welding, two ends of the pipe fitting body are respectively provided with at least one binding post, and the two binding posts are respectively connected to two ends of the resistance wire and used for conducting welding current to conduct electrofusion welding;
the pipe fitting body is provided with a pipe fitting middle part and two pipe fitting pressure bearing parts positioned on two sides in the radial direction, the pipe fitting middle part is provided with a wall thickness not smaller than that of the pipe fitting pressure bearing parts, and one side of the pipe fitting pressure bearing parts, which is close to the pipe fitting middle part in the radial direction, is provided with a thickness larger than that of two end parts of the pipe fitting body;
the bidirectional reinforcing piece is provided with a pressing part and a clamping device, and the pressing part is provided with an inner surface matched with the outer surface of the pipe fitting pressure-bearing part;
the clamping device is used for enabling the bidirectional reinforcing piece to exert pressure on the pipe fitting body in both the axial direction and the radial direction when clamping.
In addition, the bidirectional reinforced electric melting pipe fitting of the invention can also have the following characteristics:
according to one embodiment of the invention, the outer surface of the pipe fitting bearing part is an inclined plane, and the angle of the inclined plane formed between the inclined plane and the inner wall surface of the corresponding pipe fitting body is 5-30 degrees; the outer surface of the middle part of the pipe fitting is a plane, and the length of the plane is not more than twice of the length of the double-side inner-cooling welding area.
According to one embodiment of the invention, the binding posts are respectively embedded in two side end surfaces of the pipe fitting body.
According to one embodiment of the invention, when the nominal diameter of the electrofusion pipe fitting is less than or equal to 150mm, the bevel angle is less than 10 °; when the nominal diameter of the electric melting pipe fitting is larger than 150mm, the angle of the inclined plane is larger than or equal to 10 degrees.
According to one embodiment of the invention, the thickness of the middle part of the pipe is not less than the thickness of the pipe fitted with the electrofused pipe.
According to one embodiment of the invention, the bidirectional reinforcement is a pair of conical steel flanges, each having a flange portion and a clamping portion, wherein the flange portions are provided with a plurality of through holes for fitting with the clamping device.
According to one embodiment of the invention, the clamping device is a bolt-nut kit comprising a bolt, a nut and a gasket, and the distance between the two flange parts of the bidirectional reinforcing piece is not less than 3mm after the clamping device clamps the two flange parts.
According to one embodiment of the invention, the pipe fitting body and the bidirectional reinforcing piece are in positioning fit through the inclined surfaces, and the clamping device adjusts the magnitude of pressing force between the pipe fitting body and the bidirectional reinforcing piece through the bolt and the nut.
According to one embodiment of the invention, the pressing part is provided with a convex part, the pipe bearing part is provided with a concave part, and the convex part is matched with the concave part in shape.
The invention also provides a mounting method of the bidirectional reinforced electric melting pipe fitting, which comprises the following steps:
fitting a pipe fitting body of the electric melting pipe fitting with a bidirectional reinforcing piece, and clamping a clamping device, so that the bidirectional reinforcing piece exerts pressure on the pipe fitting body in both axial and radial directions;
symmetrically arranging pipelines to be connected in the electric melting pipe fittings, and connecting binding posts with an electric melting welder;
and electrifying and heating for a preset time to raise the temperature of the resistance wire arranged in the electric melting pipe fitting, so that the pipeline and the electric melting pipe fitting are connected in a fusion manner, and the installation is finished after cooling for a certain time.
According to the invention, the polyethylene pipeline joint is reinforced by optimizing the structure of the electric melting pipe fitting and adopting a novel composite structure. Because the conical surface of the conical steel flange has a certain inclination, the pressing force perpendicular to the conical surface can be provided, so that the bidirectional reinforced electric melting pipe fitting can simultaneously realize annular reinforcement and axial reinforcement on the pipe joint, and the function of preventing the end from bulging and losing efficacy is achieved. According to the relevant research of the subject group, the crack propagation of the polyethylene pipeline is mainly concentrated at 70-75 degrees, so that the designed angle of the inclined plane of the conical steel flange is 5-30 degrees, the crack propagation can be effectively inhibited, and the strength of the electric melting pipe fitting is further improved. The two-way reinforced electric melting pipe fitting and the conical steel flange are connected in a mode, so that the two-way reinforced electric melting pipe fitting can be disassembled, the manufacturing cost is low, and the interchangeability is strong. The cooperation form of two-way reinforcing electric smelting pipe fitting and toper steel flange makes novel two-way reinforcing electric smelting pipe fitting can avoid steel flange and pipeline direct contact, and the pipeline is whole can realize that the plastic is connected, and sealing performance is good, and the reliability is high. The use process of the bidirectional reinforced electric melting pipe fitting comprises the following steps: the method comprises the following steps of firstly connecting a bidirectional reinforced electric melting pipe fitting and a conical steel flange in a mechanical connection mode, and then connecting a polyethylene pipeline through electric melting welding; the mode can effectively reduce the stress at the pipeline joint.
Compared with the prior art, the invention has the following beneficial effects:
(1) the electric melting pipe fitting comprises a pipe fitting body and a bidirectional reinforcing piece, wherein the pipe fitting body and the bidirectional reinforcing piece are positioned by inclined planes, and contact surfaces are tightly pressed by a clamping device so as to realize connection. (2) The invention can simultaneously perform annular reinforcement and axial reinforcement through the inclined plane compression effect of the bidirectional reinforcement piece, and can play a role in preventing end failure; meanwhile, the pressing force direction provided by the inclined surface can effectively inhibit the expansion of the crack. (3) In the electric melting pipe fitting structure, the bidirectional reinforcing piece is not in direct contact with the pipeline, the pipeline is in full-plastic connection, and the sealing performance is good; meanwhile, the method is suitable for connecting the polyethylene pipeline and the reinforced polyethylene composite pipe. (4) The connecting sequence of the electric melting pipe fittings is as follows: the pipe fitting body and the bidirectional reinforcing piece are assembled firstly, and then the pipeline is subjected to electric fusion welding, so that the stress of the pipeline can be effectively reduced through the connection sequence.
Drawings
Fig. 1 is a schematic view of a bidirectional reinforced electrofusion pipe fitting of the present invention.
Reference numerals: 101 bidirectional reinforcement, 102,103 clamp, 104 pipe body, 105 pipeline.
FIG. 2 is a schematic view of a pipe body according to the present invention.
Reference numerals are as follows: 201, 202, 203, 201, 202, 203, middle part of pipe fitting.
Fig. 3 is a schematic view of the bidirectional reinforcement of the present invention.
Reference numerals: 301 through hole, 302 pinch portion.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description herein, references to the description of the term "one embodiment," "a preferred embodiment," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second", and the like used in the embodiments of the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated in the embodiments. Thus, a feature of an embodiment of the present invention that is defined by the terms "first," "second," etc. may explicitly or implicitly indicate that at least one of the feature is included in the embodiment. In the description of the present invention, the word "plurality" means at least two or two and more, such as two, three, four, etc., unless specifically limited otherwise in the examples.
In the present invention, unless otherwise explicitly stated or limited by the relevant description or limitation, the terms "mounted," "connected," and "fixed" in the embodiments are to be understood in a broad sense, for example, the connection may be a fixed connection, a detachable connection, or an integrated connection, and it may be understood that the connection may also be a mechanical connection, an electrical connection, etc.; of course, they may be directly connected or indirectly connected through intervening media, or they may be interconnected within one another or in an interactive relationship. Those of ordinary skill in the art will understand the specific meaning of the above terms in the present invention according to their specific implementation.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
As shown in fig. 1, a bidirectional reinforced electrofusion pipe fitting includes: a pipe body (104) and a bidirectional reinforcement (101).
The pipe fitting comprises a pipe fitting body (104) and is characterized in that the pipe fitting body (104) is provided with a hollow part suitable for accommodating a pipeline (105), a resistance wire for electric fusion welding is arranged on the inner wall of the pipe fitting body (104), at least one binding post (201) is arranged at each of two ends of the pipe fitting body (104), and the two binding posts (201) are connected to two ends of the resistance wire respectively and used for conducting welding current to carry out electric fusion welding.
The pipe fitting comprises a pipe fitting body (104) and is characterized in that a pipe fitting middle part (203) and two pipe fitting bearing parts (202) located on two sides are formed in the radial direction of the pipe fitting body (104), the pipe fitting middle part (203) has a wall thickness not smaller than that of the pipe fitting bearing parts (202), and one side, close to the pipe fitting middle part (203), of the pipe fitting bearing parts (202) in the radial direction has a thickness larger than that of two end parts of the pipe fitting body (104).
In the embodiment of the present invention, the pipe body (104) and the pipe (105) may be made of plastic materials such as polyethylene and polypropylene, and may also be made of High Density Polyethylene (HDPE), such as PE 100. In addition, reinforced composites are also optional, such as steel wire reinforced polyethylene composites or glass fiber reinforced polyethylene composites, carbon fiber reinforced polyethylene composites, and the like. Preferably, the pipe body (104) and the pipeline (105) can be made of the same material or different materials.
The bidirectional reinforcing piece is provided with a pressing part (302) and clamping devices (102, 103), wherein the pressing part (302) is provided with an inner surface matched with the outer surface of the pipe pressing part (202).
The gripping device (102, 103) is configured to cause the bi-directional reinforcement (101) to exert pressure on the tubular body (104) in both axial and radial directions when gripped.
In the embodiment of the invention, the bidirectional reinforcing part is preferably a conical steel flange, and the clamping devices (102, 103) are in a bolt structure. In addition, other reinforcements made of metal or non-metal materials are also optional, such as stainless steel flanges, copper flanges, or PVC flanges; the clamping device can also be connected in a clamping manner by welding, riveting or buckling and other manners.
In a specific embodiment of the invention, the outer surface of the pipe fitting pressure bearing part (202) is an inclined surface, and an inclined surface angle formed between the inclined surface and the inner wall surface of the corresponding pipe fitting body (104) is 5-30 degrees; the outer surface of the middle part (203) of the pipe fitting is a plane, and the length of the plane is not more than twice of the length of the double-side inner cooling welding area.
In one embodiment of the invention, the terminals (201) are respectively embedded in two side end surfaces of the pipe fitting body (104).
In a particular embodiment of the invention, when the nominal diameter of said electrofusion pipe is less than or equal to 150mm, said bevel angle is less than 10 °; when the nominal diameter of the electric melting pipe fitting is larger than 150mm, the angle of the inclined plane is larger than or equal to 10 degrees.
In a particular embodiment of the invention, the thickness of the middle part (203) of the tube is not less than the thickness of the pipe (105) fitted with the electrofused tube.
In a particular embodiment of the invention, the bidirectional reinforcement (101) is two conical steel flanges, each having a flange portion and the pressing portion (302), wherein the flange portions are provided with a plurality of through holes (301) for adapting to the clamping devices (102, 103).
In a specific embodiment of the invention, the clamping device (102, 103) is a bolt-nut kit comprising a bolt (103), a nut (102) and a gasket, and after the clamping device (102, 103) clamps, the distance between two flange parts of the bidirectional reinforcement (101) is not less than 3 mm.
In a specific embodiment of the invention, the pipe fitting body (104) and the bidirectional reinforcing piece (101) are in positioning fit through inclined surfaces, and the clamping devices (102, 103) adjust the magnitude of the pressing force between the pipe fitting body (104) and the bidirectional reinforcing piece (101) through the bolts (103) and the nuts (102).
In a specific embodiment of the invention, a convex part is arranged on the pressing part (302), a concave part is arranged on the pipe fitting pressing part (202), and the convex part is matched with the shape of the concave part.
In a specific embodiment of the present invention, the specific installation and use processes of the bidirectional reinforced electrofusion pipe fitting of the present invention are as follows: -fitting a pipe body (104) of the electrofusion pipe with the bidirectional reinforcement (101) and clamping the clamping means (102, 103) so that the bidirectional reinforcement (101) exerts a pressure on the pipe body (104) in both axial and radial directions;
symmetrically arranging pipelines (105) to be connected in the electric melting pipe fitting, and connecting the binding posts with an electric melting welding machine;
and electrifying and heating for preset time to increase the temperature of the resistance wire arranged in the electric melting pipe fitting, so that the pipeline (105) and the electric melting pipe fitting are connected in a fusion manner, and the installation is finished after cooling for a certain time.
In one embodiment of the invention, as shown in fig. 2, the tube body (104) may be manufactured by an injection molding process; the binding post (201) is used for connecting an electric heating pipeline; the inclination angle of the pipe fitting bearing part (202) is 5-30 degrees, so that crack propagation of the polyethylene pipeline can be effectively inhibited.
As shown in fig. 3, the bidirectional reinforcement is a conical steel flange, and can be manufactured by casting process: have flange portion respectively with compress tightly portion (302), wherein flange portion be equipped with a plurality of through-holes (301) that are used for with clamping device adaptation, compress tightly portion (302) inclination and the pipe fitting bears the inclination of splenium (202) the same, play the effect with pipe fitting body (104) cooperation location, play the effect of radial and axial two-way reinforcing electric smelting pipe fitting simultaneously.
The first embodiment is as follows: the size of the existing gas polyethylene pipeline is DN90, the material is PE100, the nominal pressure is 0.6 MPa, and the nominal wall thickness is En 5.5 +1.5 mm. The corresponding plastic electric melting pipe fitting is adopted for electric melting welding, the size of the plastic electric melting pipe fitting is nominal diameter De90 according to the existing design specification, the outer diameter is 110 mm, the length of the pipe fitting is 135 mm, the pipe fitting is made of the same material as the pipeline, and the nominal pressure is 1.6 MPa. If the structure design in the invention patent is adopted, the bevel angle of the bidirectional reinforced electric melting pipe fitting is 8 degrees and the nominal diameter De90 is adopted, the length of each bevel is 43.1 mm, the length of the middle plane is 30 mm, the circumferential dimension at the plane is phi 102 mm, and the nominal diameter D of a conical steel flange (ANSI 300RF) g 100, outer diameter D254 mm, bolt hole center circle diameter D 1 200 mm and an inner diameter phi of 102 mm.
The specific installation and use process is as follows: firstly, respectively matching conical surfaces at two ends of a bidirectional reinforced electric melting pipe fitting with an inclined plane angle of 8 degrees and a nominal diameter De90 with two conical steel flanges, connecting bolts through flange bolt holes, and screwing and fixing to ensure that the distance between the two flanges is 5 mm; next, symmetrically arranging DN90 plastic pipelines of which the two ends are to be connected in the electric melting pipe fitting, and connecting the binding posts with an electric melting welding machine; and finally, electrifying and heating, raising the temperature of the copper wire arranged in the electric melting pipe fitting, melting the surrounding plastic material, fusing the plastic pipeline and the electric melting pipe fitting together by the self thermal expansion effect of the plastic welding pipe, and cooling for a certain time.
The second embodiment is as follows:
the prior water supply steel wire reinforced polyethylene composite pipe has the size DN200, the nominal pressure of 2.0 MPa and the nominal wall thickness En of 10.5 +2.0 mm. The specific structure is that the inner layer PE 100-special heat is arranged from inside to outsideThe steel wire is characterized by comprising the following steps of melting glue, winding a steel wire mesh, special hot melt glue, an outer layer PE100, wherein the diameter of the steel wire is 0.5 mm, the winding angle is 55 degrees, the winding direction is left-handed and right-handed, and the number of steel wires on the section is 115. The corresponding steel skeleton plastic composite electric melting pipe fitting is adopted for electric melting welding, the size of the plastic electric melting pipe fitting (the steel plate with the thickness of 0.6mm is embedded inside) is nominal diameter De200, the outer diameter is 250 mm, the length of the pipe fitting is 230 mm, the nominal pressure is 3.5MPa, the concrete structure is PE100, and the steel plate with the length of 80mm and the thickness of 0.6mm is embedded inside the pipe fitting according to the existing design specifications. If the structure design in the invention patent is adopted, the bevel angle of the bidirectional reinforced electric melting pipe fitting is 10 degrees, the nominal diameter De is 200 degrees, the length of the bevel is 60.5 mm, the length of the middle plane is 40 mm, the circumferential dimension at the plane is phi 221 mm, and the nominal diameter D of the conical steel flange (ANSI 900RF) g 200, outer diameter D445 mm, bolt hole center circle diameter D 1 387 mm and an internal diameter of phi 221 mm.
The specific installation and use process is as follows: firstly, respectively matching conical surfaces at two ends of a bidirectional reinforced electric melting pipe fitting with an inclined plane angle of 10 degrees and a nominal diameter De200 with two conical steel flanges, connecting bolts through flange bolt holes, and screwing and fixing to ensure that the distance between the two flanges is 6 mm; then, symmetrically arranging plastic pipelines to be connected at two ends in the electric melting pipe fitting, and connecting the binding posts with an electric melting welder; and finally, electrifying and heating, raising the temperature of the copper wire arranged in the electric melting pipe fitting, melting the surrounding plastic material, fusing the plastic pipeline and the electric melting pipe fitting together by the self thermal expansion effect of the plastic welding pipe, and cooling for a certain time.
Specific example three:
the design life of a certain nuclear power plant is 60 years, high-density polyethylene pipes are selected as the pipeline materials of the SWS system arranged in the comprehensive pipe gallery, the length of each HDPE pipe is 12m, the nominal diameter DN750 is larger than the maximum diameter of the HDPE pipe, the outer diameter of the HDPE pipe is 762 mm, the wall thickness of the HDPE pipe is about 84.6mm, and the nominal pressure of the HDPE pipe is 2 MPa. The corresponding plastic electric melting pipe fitting is adopted for electric melting welding, the size of the plastic electric melting pipe fitting is nominal diameter De750, the outer diameter is 880 mm, the length of the pipe fitting is 450 mm according to the existing design specifications, the material which is the same as that of the pipeline is adopted, and the nominal pressure of the pipe fitting is 3.5 MPa. If designed according to the structure in the patent of the invention, the twoThe angle of the inclined plane of the reinforced electric melting pipe fitting is 15 degrees, the nominal diameter De750 is realized, the length of the conical surface is 174 mm, the length of the middle plane is 60 mm, the circumferential size of the plane is phi 840 mm, the nominal diameter Dg750 of the conical steel flange is realized, the outer diameter D is 1500 mm, and the diameter D of the central circle of the bolt hole is realized 1 1350 mm and an inner diameter phi 840 mm.
The specific installation and use process is as follows: firstly, respectively matching conical surfaces at two ends of a bidirectional reinforced electric melting pipe fitting with an inclined plane angle of 15 degrees and a nominal diameter De750 with two conical steel flanges, connecting bolts through flange bolt holes, and screwing and fixing to ensure that the distance between the two flanges is 8 mm; then, symmetrically arranging the plastic pipelines to be connected at two ends in the electric melting pipe fitting, and connecting the binding posts with an electric melting welding machine; and finally, electrifying and heating, raising the temperature of the copper wires arranged in the electric melting pipe fitting, melting the surrounding plastic materials, fusing the plastic pipeline and the electric melting pipe fitting together by the self thermal expansion effect of the plastic welding pipe, and cooling for a certain time.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A bidirectionally reinforced electrofusion pipe fitting, comprising: a pipe body (104) and a bidirectional reinforcement (101);
the pipe fitting body (104) is of an integral electric melting sleeve structure and is provided with a hollow part suitable for receiving a pipeline (105), a resistance wire for electric melting welding is arranged on the inner wall of the pipe fitting body (104), at least one binding post (201) is arranged at each of two ends of the pipe fitting body (104), and the binding posts (201) are connected to two ends of the resistance wire respectively and are used for conducting welding current to perform electric melting welding;
a pipe middle part (203) and two pipe bearing parts (202) positioned at two sides are formed on the pipe body (104) along the axial direction, the pipe middle part (203) has a wall thickness not smaller than that of the pipe bearing parts (202), and one side of the pipe bearing parts (202) close to the pipe middle part (203) along the radial direction has a thickness larger than that of two end parts of the pipe body (104);
the outer surfaces of the pipe fitting pressure bearing part (202) extending to two sides of the end part are inclined planes, and the angle of the inclined plane formed between the inclined plane and the inner wall surface corresponding to the pipe fitting body (104) is 5-30 degrees;
the bidirectional reinforcing piece is provided with a pressing part (302) and a clamping device (102, 103), wherein the pressing part (302) is provided with an inner surface matched with the outer surface of the pipe pressing part (202);
the gripping device (102, 103) is adapted such that, when gripping, the bidirectional reinforcement (101) exerts a pressure on the tubular body (104) in both an axial direction and a radial direction.
2. A bi-directionally reinforced electrofusion tube as claimed in claim 1, wherein: the outer surface of the middle part (203) of the pipe fitting is a plane, and the length of the plane is not more than twice of the length of the double-side inner cooling welding area.
3. A bi-directionally reinforced electrofusion tube as claimed in claim 1, wherein: the binding posts (201) are respectively embedded in two side end faces of the pipe fitting body (104).
4. A bi-directionally reinforced electrofusion tube as claimed in claim 1, wherein: when the nominal diameter of the electric melting pipe fitting is less than or equal to 150mm, the angle of the inclined plane is less than 10 degrees; when the nominal diameter of the electric melting pipe fitting is larger than 150mm, the angle of the inclined plane is larger than or equal to 10 degrees.
5. A bi-directionally reinforced electrofusion tube as claimed in claim 1, wherein: the thickness of the middle part (203) of the pipe fitting is not less than that of the pipeline (105) matched with the electric melting pipe fitting.
6. A bi-directionally reinforced electrofusion tube as claimed in claim 1, wherein: the bidirectional reinforcement (101) is a pair of conical steel flanges, each having a flange portion and the pressing portion (302), wherein the flange portions are provided with a plurality of through holes (301) for fitting with the clamping devices (102, 103).
7. A bi-directionally reinforced electrofusion tube as claimed in claim 1, wherein: the clamping devices (102, 103) are bolt and nut kits and comprise bolts (103), nuts (102) and gaskets, and after the clamping devices (102, 103) clamp, the distance between two flange parts of the bidirectional reinforcing part (101) is not less than 3 mm.
8. The bidirectionally reinforced electrofusion tube assembly of claim 7, wherein: the pipe fitting body (104) is in positioning fit with the bidirectional reinforcing piece (101) through an inclined surface, and the clamping devices (102, 103) adjust the magnitude of pressing force between the pipe fitting body (104) and the bidirectional reinforcing piece (101) through the bolts (103) and the nuts (102).
9. A bi-directionally reinforced electrofusion tube as claimed in claim 1, wherein: the pressing part (302) is provided with a convex part, the pipe fitting pressing part (202) is provided with a concave part, and the convex part is matched with the concave part in shape.
10. A method of installing a bidirectionally reinforced electrofusion pipe fitting as recited in any of claims 1-9, wherein: the method comprises the following steps:
-fitting a pipe body (104) of the electrofusion pipe with the bidirectional reinforcement (101) and clamping the clamping means (102, 103) so that the bidirectional reinforcement (101) exerts a pressure on the pipe body (104) in both axial and radial directions;
symmetrically arranging pipelines (105) to be connected in the electric melting pipe fitting, and connecting the binding posts with an electric melting welding machine;
and electrifying and heating for a preset time to raise the temperature of the resistance wires arranged in the electric melting pipe fittings, so that the pipeline (105) and the electric melting pipe fittings are fused and connected, and the installation is completed after cooling for a certain time.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210534609.1A CN114636040B (en) | 2022-05-17 | 2022-05-17 | Bidirectional reinforced electric melting pipe fitting and mounting method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210534609.1A CN114636040B (en) | 2022-05-17 | 2022-05-17 | Bidirectional reinforced electric melting pipe fitting and mounting method thereof |
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| CN114636040A CN114636040A (en) | 2022-06-17 |
| CN114636040B true CN114636040B (en) | 2022-08-16 |
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| CH662401A5 (en) * | 1982-11-06 | 1987-09-30 | Bbc Brown Boveri & Cie | PIPELINE. |
| US4702498A (en) * | 1985-10-31 | 1987-10-27 | Georg Fischer Aktiengesellschaft | Flange connection for fiber-reinforced plastic pipe pieces |
| CN201731214U (en) * | 2010-04-21 | 2011-02-02 | 四川煌盛管业有限公司 | Pipe fitting for connection of mining plastic pipelines |
| CN104185758A (en) * | 2012-03-14 | 2014-12-03 | Y·M·彼得罗夫 | Metal-containing polymeric reinforced pipe, method for manufacturing same and pipeline produced using said pipe |
| CN206943667U (en) * | 2017-06-28 | 2018-01-30 | 曹如锋 | A kind of RTP joint design |
| CN216520234U (en) * | 2021-11-17 | 2022-05-13 | 青海凯德力管道工程有限公司 | Steel wire mesh skeleton pipe flange connector |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA3040163C (en) * | 2012-02-17 | 2021-02-16 | Core Linepipe Inc. | Pipe electro-fusion assembly |
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2022
- 2022-05-17 CN CN202210534609.1A patent/CN114636040B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH662401A5 (en) * | 1982-11-06 | 1987-09-30 | Bbc Brown Boveri & Cie | PIPELINE. |
| US4702498A (en) * | 1985-10-31 | 1987-10-27 | Georg Fischer Aktiengesellschaft | Flange connection for fiber-reinforced plastic pipe pieces |
| CN201731214U (en) * | 2010-04-21 | 2011-02-02 | 四川煌盛管业有限公司 | Pipe fitting for connection of mining plastic pipelines |
| CN104185758A (en) * | 2012-03-14 | 2014-12-03 | Y·M·彼得罗夫 | Metal-containing polymeric reinforced pipe, method for manufacturing same and pipeline produced using said pipe |
| CN206943667U (en) * | 2017-06-28 | 2018-01-30 | 曹如锋 | A kind of RTP joint design |
| CN216520234U (en) * | 2021-11-17 | 2022-05-13 | 青海凯德力管道工程有限公司 | Steel wire mesh skeleton pipe flange connector |
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| Publication number | Publication date |
|---|---|
| CN114636040A (en) | 2022-06-17 |
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