CN111810729A - Method for manufacturing steel lining polytetrafluoroethylene combined pipe - Google Patents

Method for manufacturing steel lining polytetrafluoroethylene combined pipe Download PDF

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Publication number
CN111810729A
CN111810729A CN202010470864.5A CN202010470864A CN111810729A CN 111810729 A CN111810729 A CN 111810729A CN 202010470864 A CN202010470864 A CN 202010470864A CN 111810729 A CN111810729 A CN 111810729A
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China
Prior art keywords
tube
polytetrafluoroethylene
pipe
steel
flange
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CN202010470864.5A
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Chinese (zh)
Inventor
谭银昌
薛家伟
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Hubei Shiji Weiye Anti Corrosion Technology Co ltd
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Hubei Shiji Weiye Anti Corrosion Technology Co ltd
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Priority to CN202010470864.5A priority Critical patent/CN111810729A/en
Publication of CN111810729A publication Critical patent/CN111810729A/en
Pending legal-status Critical Current

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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
    • F16L9/00—Rigid pipes
    • F16L9/14—Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
    • C09J11/02—Non-macromolecular additives
    • C09J11/04—Non-macromolecular additives inorganic
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J163/00—Adhesives based on epoxy resins; Adhesives based on derivatives of epoxy resins
    • 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
    • F16L23/00—Flanged joints
    • F16L23/02—Flanged joints the flanges being connected by members tensioned axially
    • F16L23/024—Flanged joints the flanges being connected by members tensioned axially characterised by how the flanges are joined to, or form an extension of, the pipes
    • 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
    • F16L23/00—Flanged joints
    • F16L23/02—Flanged joints the flanges being connected by members tensioned axially
    • F16L23/032—Flanged joints the flanges being connected by members tensioned axially characterised by the shape or composition of the flanges
    • 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
    • F16L57/00—Protection of pipes or objects of similar shape against external or internal damage or wear
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/08—Stabilised against heat, light or radiation or oxydation

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Laminated Bodies (AREA)

Abstract

The invention provides a method for manufacturing a steel-lined polytetrafluoroethylene composite pipe, which comprises the following steps: respectively connecting a flange at the top end and the bottom end of the steel pipe, and polishing the lining of the steel pipe; tightly lining the polytetrafluoroethylene tube in the steel tube in a flanging mode; and (3) placing the inner pipe made of the substance A in the polytetrafluoroethylene pipe, uniformly filling fine powder of the substance A in the pores between the outer wall of the inner pipe and the inner wall of the polytetrafluoroethylene pipe, and then bonding the polytetrafluoroethylene pipe and the inner pipe by using an adhesive to realize sealing treatment, thereby obtaining the steel-lined polytetrafluoroethylene combined pipe. The preparation method provided by the invention is simple in process and convenient for realizing industrial production. The steel-lined polytetrafluoroethylene combined pipe prepared by the preparation method has excellent corrosion resistance, wear resistance, pressure resistance, temperature resistance and heat insulation performance.

Description

Method for manufacturing steel lining polytetrafluoroethylene combined pipe
Technical Field
The invention relates to the technical field of pipes, in particular to a manufacturing method of a steel-lined polytetrafluoroethylene composite pipe.
Background
In the traditional process, corrosion-resistant materials and high-temperature-resistant materials are mostly coated on the inner side or the outer side of a steel pipe to enhance the corrosion resistance and the high temperature resistance of the steel pipe, however, after long-time use, the effect of a coating layer is poor, and the production is influenced. It is therefore necessary to provide a composite pipe having excellent corrosion resistance and high temperature resistance.
Disclosure of Invention
In view of the above, the invention provides a method for manufacturing a steel-lined polytetrafluoroethylene composite pipe, and the steel-lined polytetrafluoroethylene composite pipe manufactured by the method has excellent corrosion resistance, wear resistance, pressure resistance, temperature resistance and heat insulation performance.
The invention provides a method for manufacturing a steel-lined polytetrafluoroethylene composite pipe, which comprises the following steps:
s1, selecting a proper steel pipe drift diameter according to the medium drift diameter requirement of the practical requirement of a chemical field, then fixedly connecting a flange at each of a top end connecting port and a bottom end connecting port of the steel pipe, and polishing the lining of the steel pipe to reach the lining HG/T26500 standard;
s2, selecting a polytetrafluoroethylene tube with a proper diameter, and tightly lining the polytetrafluoroethylene tube in the steel tube in a flanging mode;
s3, placing the inner pipe made of the substance A in a polytetrafluoroethylene pipe, uniformly filling fine powder of the substance A in the pores between the outer wall of the inner pipe and the inner wall of the polytetrafluoroethylene pipe, and then bonding the polytetrafluoroethylene pipe and the inner pipe by using an adhesive to realize sealing treatment, thus obtaining the steel-lined polytetrafluoroethylene combined pipe.
Further, the outer diameter of the inner tube is 3mm smaller than the inner diameter of the polytetrafluoroethylene tube.
Further, the polytetrafluoroethylene tube has an axial length greater than an axial length of the inner tube.
Further, the substance A is selected from any one of silicon carbide, silicon nitride or graphite.
Furthermore, the adhesive is prepared by uniformly mixing the substance A and the epoxy resin according to the mass ratio of 9: 20.
Further, the flange is provided with a bolt hole.
The invention also provides a steel-lined polytetrafluoroethylene composite pipe prepared by the preparation method, which sequentially comprises a steel pipe, a polytetrafluoroethylene pipe and an inner pipe from outside to inside, wherein the inner pipe is prepared from a substance A, the steel pipe, the polytetrafluoroethylene pipe and the inner pipe are all of cylindrical structures with openings at two ends, the inner wall of the steel pipe is tightly attached to the outer wall of the polytetrafluoroethylene pipe, the top end of the polytetrafluoroethylene pipe is bonded to the outer wall of the inner pipe through a first adhesive layer, the bottom end of the polytetrafluoroethylene pipe is bonded to the outer wall of the inner pipe through a second adhesive layer, and fine powder of the substance A is uniformly filled in pores between the outer wall of the inner pipe and the inner wall of the polytetrafluoroethylene pipe.
Further, the substance A is selected from any one of silicon carbide, silicon nitride or graphite.
Further, the first adhesive layer and the second adhesive layer are both made of high-temperature-resistant adhesives. Preferably, the high-temperature-resistant adhesive is prepared by uniformly mixing the substance A and the epoxy resin according to the mass ratio of 9: 20. .
Further, the outer diameter of the inner tube is 3mm smaller than the inner diameter of the polytetrafluoroethylene tube.
Further, the polytetrafluoroethylene tube is connected with the steel tube tight lining flanging, and the axial length of the polytetrafluoroethylene tube is larger than that of the inner tube.
Further, the top end of the steel pipe is fixedly connected with a first flange, the bottom end of the steel pipe is fixedly connected with a second flange, and bolt holes are formed in the first flange and the second flange.
Furthermore, the top end of the polytetrafluoroethylene tube extends outwards to form a first flanging, the first flanging is flatly and tightly pressed on the end face of the first flange, the bottom end of the polytetrafluoroethylene tube extends outwards to form a second flanging, and the second flanging is flatly and tightly pressed on the end face of the second flange.
The technical scheme provided by the invention has the beneficial effects that: the preparation method provided by the invention has simple process and is convenient for realizing industrial production; the inner pipe made of the substance A is sleeved on the inner side of the polytetrafluoroethylene pipe, the inner pipe and the polytetrafluoroethylene pipe are complementary in performance, and the inner pipe supplements the defect of polytetrafluoroethylene plastic fatigue and is beneficial to stable transmission of a medium; the combined pipe provided by the invention has the advantages that the fine powder of the substance A is filled in the pores between the inner pipe and the polytetrafluoroethylene pipe, so that the hardness, the strength and the negative pressure resistance of the combined pipe are further improved, and the mechanical stability and the scouring resistance of the combined pipe are enhanced.
Drawings
FIG. 1 is a schematic flow chart of the preparation of the steel-lined PTFE composite pipe according to example 1 of the present invention.
FIG. 2 is a perspective view of the steel-lined PTFE composite pipe of example 1 of the present invention.
FIG. 3 is a schematic structural view of a steel-lined PTFE composite pipe according to example 1 of the present invention.
FIG. 4 is a front view of the steel-lined PTFE composite pipe of example 1 of the present invention.
FIG. 5 is a schematic structural view of a steel-lined PTFE composite pipe according to example 2 of the present invention.
FIG. 6 is a front view of the steel-lined PTFE composite pipe of example 2 of the present invention.
FIG. 7 is a schematic structural view of a steel-lined PTFE composite pipe according to example 3 of the present invention.
FIG. 8 is a front view of the steel-lined PTFE composite pipe of example 3 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be further described with reference to the accompanying drawings and examples.
Example 1:
the embodiment 1 of the invention provides a manufacturing method of a steel-lined polytetrafluoroethylene combined pipe, which specifically comprises the following steps:
step S1, selecting a proper steel pipe drift diameter according to the medium drift diameter requirement of the practical requirement of a chemical field, welding a flange at a top end connecting port and a bottom end connecting port of the steel pipe respectively, and polishing the lining of the steel pipe to reach the lining HG/T26500 standard;
step S2, selecting a polytetrafluoroethylene tube with a proper diameter, and tightly lining the polytetrafluoroethylene tube in the steel tube in a flanging mode;
step S3, selecting a silicon nitride ceramic tube which is made of silicon nitride and has an outer diameter smaller than the inner diameter of the polytetrafluoroethylene tube by 3mm, then placing the silicon nitride ceramic tube in the polytetrafluoroethylene tube, uniformly filling silicon nitride fine powder with the average particle size of 10 mu m in pores between the outer wall of the silicon nitride ceramic tube and the inner wall of the polytetrafluoroethylene tube, then uniformly coating an adhesive prepared by uniformly mixing the silicon nitride fine powder and epoxy resin according to the mass ratio of 9:20 between the top end of the polytetrafluoroethylene tube and the outer wall of the silicon nitride ceramic tube and between the bottom end of the polytetrafluoroethylene tube and the outer wall of the silicon nitride ceramic tube, curing and forming at room temperature, and then bonding the polytetrafluoroethylene tube and the silicon nitride ceramic tube to realize sealing treatment, thus obtaining the steel-lined polytetrafluoroethylene combined tube.
The flange is provided with bolt holes, and adjacent combined pipes can be connected in a matched mode by inserting bolts into the bolt holes.
The polytetrafluoroethylene tube has an axial length greater than that of the silicon nitride ceramic tube.
The schematic production flow of example 1 is shown in fig. 1.
Referring to fig. 2, 3 and 4, embodiment 1 of the present invention further provides a steel-lined ptfe composite tube manufactured by the above manufacturing method, which sequentially comprises, from outside to inside, a steel tube 1, a ptfe tube 2 and a silicon nitride ceramic tube 3, where the steel tube 1, the ptfe tube 2 and the silicon nitride ceramic tube 3 are all cylindrical structures with openings at two ends.
The top end of the steel pipe 1 is welded with a first flange 4, the bottom end of the steel pipe 1 is welded with a second flange 5, and preferably, the steel pipe 1 is a seamless steel pipe.
Bolt holes 41 are formed in the first flange 4 and the second flange 5, and bolts are inserted into the corresponding bolt holes 41 to enable adjacent combined pipes to be connected in a matched mode.
The polytetrafluoroethylene tube 2 is made of polytetrafluoroethylene, the long-term use temperature is-200-260 ℃, the chemical corrosion resistance is excellent, and the electrical insulation is not influenced by the temperature.
The top end of the polytetrafluoroethylene tube 2 extends outwards to form a smooth first flanging 21, the first flanging 21 is flatly and tightly pressed on the end face of the first flange 4, the bottom end of the polytetrafluoroethylene tube 2 extends outwards to form a smooth second flanging 22, and the second flanging 22 is flatly and tightly pressed on the end face of the second flange 5. The outer wall of the polytetrafluoroethylene tube 2 is tightly attached to the inner wall of the steel tube 1.
The top end of the polytetrafluoroethylene tube 2 is positioned above the top end of the steel tube 1, and the bottom end of the polytetrafluoroethylene tube 2 is positioned below the bottom end of the steel tube 1.
The polytetrafluoroethylene tube 2 has an axial length greater than that of the steel tube 1.
The silicon nitride ceramic tube 3 is made of silicon nitride, the silicon nitride material is a compound synthesized by using nitrogen and silicon under artificial conditions, has good chemical stability, high thermal stability, strong oxidation resistance, high hardness, high strength, excellent high temperature resistance and corrosion resistance, and is suitable for the working environment of high-temperature, high-speed and strong corrosive media.
Silicon nitride fine powder 31 with the average grain diameter of 10 mu m is uniformly filled in the pores between the outer wall of the silicon nitride ceramic tube 3 and the inner wall of the polytetrafluoroethylene tube 2, and the silicon nitride fine powder 31 is filled in the pores between the silicon nitride ceramic tube 3 and the polytetrafluoroethylene tube 2, so that the hardness, the strength and the negative pressure resistance of the combined tube can be further improved, and the mechanical stability and the scouring resistance of the combined tube are enhanced.
The top end of the polytetrafluoroethylene tube 2 is bonded with the outer wall of the silicon nitride ceramic tube 3 through the first adhesive layer 23 to realize sealing treatment, the bottom end of the polytetrafluoroethylene tube 2 is bonded with the outer wall of the silicon nitride ceramic tube 3 through the second adhesive layer 24 to realize sealing treatment, and the first adhesive layer 23 and the second adhesive layer 24 are both formed by high-temperature-resistant adhesives. The high-temperature-resistant adhesive is prepared by uniformly mixing silicon nitride fine powder and epoxy resin according to the mass ratio of 9: 20.
The outer diameter of the silicon nitride ceramic tube 3 is 3mm smaller than the inner diameter of the polytetrafluoroethylene tube 2. The polytetrafluoroethylene tube 2 has an axial length greater than that of the silicon nitride ceramic tube 3.
The top end of the silicon nitride ceramic tube 3 is positioned above the top end of the polytetrafluoroethylene tube 2, and the bottom end of the silicon nitride ceramic tube 3 is positioned above the bottom end of the polytetrafluoroethylene tube 2. The length of the top end of the silicon nitride ceramic tube 3 exceeding the top end of the polytetrafluoroethylene tube 2 is consistent with the length of the bottom end of the silicon nitride ceramic tube 3 lower than the bottom end of the polytetrafluoroethylene tube 2.
Referring to fig. 4, the top end of the silicon nitride ceramic tube 3 is provided with an annular groove 32 with a depth of 0.5mm, the bottom end of the silicon nitride ceramic tube 3 is provided with an annular protrusion with a height of 0.5mm, the annular protrusion is matched with the annular groove 32 at the top end of the silicon nitride ceramic tube 3, when two combined tubes are connected, the first flange 4 of the first combined tube can be matched and connected with the second flange 5 of the second combined tube through bolts, and simultaneously the annular groove 32 at the top end of the silicon nitride ceramic tube 3 of the first combined tube is matched and connected with the annular protrusion at the bottom end of the silicon nitride ceramic tube 3 of the second combined tube, so that the top end surface of the silicon nitride ceramic tube 3 of the first combined tube is matched and butted with the bottom end surface of the silicon nitride ceramic tube 3 of the second combined tube, in order to enhance the sealing performance, a sealing gasket is arranged at the matching and connecting position of the first flange 4 and the second flange 5, so as to realize the sealing between, therefore, the chemical liquid medium can not corrode the flange when flowing in the combined pipe.
Example 2:
the embodiment 2 of the invention provides a manufacturing method of a steel-lined polytetrafluoroethylene combined pipe, which specifically comprises the following steps:
step S1, selecting a proper steel pipe drift diameter according to the medium drift diameter requirement of the practical requirement of a chemical field, welding a flange at a top end connecting port and a bottom end connecting port of the steel pipe respectively, and polishing the lining of the steel pipe to reach the lining HG/T26500 standard;
step S2, selecting a polytetrafluoroethylene tube with a proper diameter, and tightly lining the polytetrafluoroethylene tube in the steel tube in a flanging mode;
step S3, selecting a silicon carbide ceramic tube which is made of silicon carbide and has an outer diameter smaller than the inner diameter of the polytetrafluoroethylene tube by 3mm, placing the silicon carbide ceramic tube in the polytetrafluoroethylene tube, uniformly filling silicon carbide fine powder with the average particle size of 10 mu m into pores between the outer wall of the silicon carbide ceramic tube and the inner wall of the polytetrafluoroethylene tube, uniformly coating an adhesive prepared by uniformly mixing the silicon carbide fine powder and epoxy resin according to the mass ratio of 9:20 between the top end of the polytetrafluoroethylene tube and the outer wall of the silicon carbide ceramic tube and between the bottom end of the polytetrafluoroethylene tube and the outer wall of the silicon carbide ceramic tube, curing and forming at room temperature, wherein the polytetrafluoroethylene tube and the silicon carbide ceramic tube are bonded to realize sealing treatment, and the steel-lined polytetrafluoroethylene combined tube is prepared.
The flange is provided with bolt holes, and adjacent combined pipes can be connected in a matched mode by inserting bolts into the bolt holes.
The polytetrafluoroethylene tube has an axial length greater than the silicon carbide ceramic tube.
Referring to fig. 5 and 6, embodiment 2 of the present invention further provides a steel-lined ptfe composite tube manufactured by the above manufacturing method, which sequentially comprises, from outside to inside, a steel tube 1, a ptfe tube 2, and a silicon carbide ceramic tube 6, wherein the steel tube 1, the ptfe tube 2, and the silicon carbide ceramic tube 6 are all cylindrical structures with openings at two ends.
The top end of the steel pipe 1 is welded with a first flange 4, the bottom end of the steel pipe 1 is welded with a second flange 5, and preferably, the steel pipe 1 is a seamless steel pipe.
Bolt holes 41 are formed in the first flange 4 and the second flange 5, and bolts are inserted into the corresponding bolt holes 41 to enable adjacent combined pipes to be connected in a matched mode.
The polytetrafluoroethylene tube 2 is made of polytetrafluoroethylene, the long-term use temperature is-200-260 ℃, the chemical corrosion resistance is excellent, and the electrical insulation is not influenced by the temperature.
The top end of the polytetrafluoroethylene tube 2 extends outwards to form a smooth first flanging 21, the first flanging 21 is flatly and tightly pressed on the end face of the first flange 4, the bottom end of the polytetrafluoroethylene tube 2 extends outwards to form a smooth second flanging 22, and the second flanging 22 is flatly and tightly pressed on the end face of the second flange 5. The outer wall of the polytetrafluoroethylene tube 2 is tightly attached to the inner wall of the steel tube 1.
The top end of the polytetrafluoroethylene tube 2 is positioned above the top end of the steel tube 1, and the bottom end of the polytetrafluoroethylene tube 2 is positioned below the bottom end of the steel tube 1.
The polytetrafluoroethylene tube 2 has an axial length greater than that of the steel tube 1.
The silicon carbide ceramic tube 6 is made of silicon carbide, the hardness is 1000-5000 HV, and the rigidity is 440GPa/m2It is high temperature resistant, fireproof, incombustible, and has excellent oxidation resistance, corrosion resistance and wear resistance.
Silicon carbide fine powder 61 with the average grain diameter of 10 mu m is uniformly filled in the pores between the outer wall of the silicon carbide ceramic tube 6 and the inner wall of the polytetrafluoroethylene tube 2, and the silicon carbide fine powder 61 is filled in the pores between the silicon carbide ceramic tube 6 and the polytetrafluoroethylene tube 2, so that the hardness, the strength and the negative pressure resistance of the combined tube can be further improved, and the mechanical stability and the scouring resistance of the combined tube are enhanced.
The top end of the polytetrafluoroethylene tube 2 is bonded with the outer wall of the silicon carbide ceramic tube 6 through the first adhesive layer 23 to realize sealing treatment, the bottom end of the polytetrafluoroethylene tube 2 is bonded with the outer wall of the silicon carbide ceramic tube 6 through the second adhesive layer 24 to realize sealing treatment, and the first adhesive layer 23 and the second adhesive layer 24 are both formed by high-temperature-resistant adhesives. The high-temperature-resistant adhesive is prepared by uniformly mixing silicon carbide fine powder and epoxy resin according to the mass ratio of 9: 20.
The outer diameter of the silicon carbide ceramic tube 6 is 3mm smaller than the inner diameter of the polytetrafluoroethylene tube 2. The polytetrafluoroethylene tube 2 has an axial length greater than that of the silicon carbide ceramic tube 6.
The top end of the silicon carbide ceramic tube 6 is positioned above the top end of the polytetrafluoroethylene tube 2, and the bottom end of the silicon carbide ceramic tube 6 is positioned above the bottom end of the polytetrafluoroethylene tube 2. The length of the top end of the silicon carbide ceramic tube 6 exceeding the top end of the polytetrafluoroethylene tube 2 is the same as the length of the bottom end of the silicon carbide ceramic tube 6 lower than the bottom end of the polytetrafluoroethylene tube 2.
Referring to fig. 6, an annular groove 62 with a depth of 0.4mm is formed at the top end of the silicon carbide ceramic tube 6, an annular protrusion with a height of 0.4mm is formed at the bottom end of the silicon carbide ceramic tube 6, the annular protrusion is matched with the annular groove 62 at the top end of the silicon carbide ceramic tube 6, when two combination tubes are connected, the first flange 4 of the first combination tube can be matched and connected with the second flange 5 of the second combination tube through bolts, and simultaneously, the annular groove 62 at the top end of the silicon carbide ceramic tube 6 of the first combination tube is matched and connected with the annular protrusion at the bottom end of the silicon carbide ceramic tube 6 of the second combination tube, so that the top end surface of the silicon carbide ceramic tube 6 of the first combination tube is matched and butted with the bottom end surface of the silicon carbide ceramic tube 6 of the second combination tube, and for enhancing the sealing performance, a sealing gasket is arranged at the matching and connecting position of the first flange 4 and the second flange 5, thereby realizing the sealing between the combination, therefore, the chemical liquid medium can not corrode the flange when flowing in the combined pipe.
Example 3:
the embodiment 3 of the invention provides a manufacturing method of a steel-lined polytetrafluoroethylene combined pipe, which specifically comprises the following steps:
step S1, selecting a proper steel pipe drift diameter according to the medium drift diameter requirement of the practical requirement of a chemical field, welding a flange at a top end connecting port and a bottom end connecting port of the steel pipe respectively, and polishing the lining of the steel pipe to reach the lining HG/T26500 standard;
step S2, selecting a polytetrafluoroethylene tube with a proper diameter, and tightly lining the polytetrafluoroethylene tube in the steel tube in a flanging mode;
step S3, selecting a graphite tube which is made of graphite and has an outer diameter which is 3mm smaller than the inner diameter of the polytetrafluoroethylene tube, placing the graphite tube in the polytetrafluoroethylene tube, uniformly filling graphite fine powder with the average particle size of 10 mu m in pores between the outer wall of the graphite tube and the inner wall of the polytetrafluoroethylene tube, uniformly coating an adhesive prepared by uniformly mixing the graphite fine powder and epoxy resin according to the mass ratio of 9:20 between the top end of the polytetrafluoroethylene tube and the outer wall of the graphite tube and between the bottom end of the polytetrafluoroethylene tube and the outer wall of the graphite tube, curing and forming at room temperature, and then bonding the polytetrafluoroethylene tube and the graphite tube to realize sealing treatment, namely preparing the steel-lined polytetrafluoroethylene combined tube.
The flange is provided with bolt holes, and adjacent combined pipes can be connected in a matched mode by inserting bolts into the bolt holes.
The polytetrafluoroethylene tube has an axial length greater than the axial length of the graphite tube.
Referring to fig. 7 and 8, embodiment 3 of the present invention further provides a steel-lined ptfe composite tube manufactured by the above manufacturing method, which sequentially comprises, from outside to inside, a steel tube 1, a ptfe tube 2, and a graphite tube 7, wherein the steel tube 1, the ptfe tube 2, and the graphite tube 7 are all cylindrical structures with openings at two ends.
The top end of the steel pipe 1 is welded with a first flange 4, the bottom end of the steel pipe 1 is welded with a second flange 5, and preferably, the steel pipe 1 is a seamless steel pipe.
Bolt holes 41 are formed in the first flange 4 and the second flange 5, and bolts are inserted into the corresponding bolt holes 41 to enable adjacent combined pipes to be connected in a matched mode.
The polytetrafluoroethylene tube 2 is made of polytetrafluoroethylene, the long-term use temperature is-200-260 ℃, the chemical corrosion resistance is excellent, and the electrical insulation is not influenced by the temperature.
The top end of the polytetrafluoroethylene tube 2 extends outwards to form a smooth first flanging 21, the first flanging 21 is flatly and tightly pressed on the end face of the first flange 4, the bottom end of the polytetrafluoroethylene tube 2 extends outwards to form a smooth second flanging 22, and the second flanging 22 is flatly and tightly pressed on the end face of the second flange 5. Preferably, the outer wall of the polytetrafluoroethylene tube 2 is closely attached to the inner wall of the steel tube 1.
The top end of the polytetrafluoroethylene tube 2 is positioned above the top end of the steel tube 1, and the bottom end of the polytetrafluoroethylene tube 2 is positioned below the bottom end of the steel tube 1.
The polytetrafluoroethylene tube 2 has an axial length greater than that of the steel tube 1.
The graphite pipe 7 is made of high-purity graphite powder, has good chemical stability, can resist acid, alkali and organic solvent corrosion, has excellent high temperature resistance, corrosion resistance, oxidation resistance, plasticity, wear resistance and electrical conductivity, has small thermal expansion coefficient and good stability when the temperature changes rapidly, and does not generate cracks in the rapid cooling and heating change of the temperature.
Graphite fine powder 71 with the average grain diameter of 10 mu m is uniformly filled in the pore between the outer wall of the graphite pipe 7 and the inner wall of the polytetrafluoroethylene pipe 2, and the graphite fine powder 71 is filled in the pore between the graphite pipe 7 and the polytetrafluoroethylene pipe 2, so that the hardness, the strength and the negative pressure resistance of the combined pipe can be further improved, and the mechanical stability and the scouring resistance of the combined pipe are enhanced.
The top end of the polytetrafluoroethylene tube 2 is bonded with the outer wall of the graphite tube 7 through the first adhesive layer 23 to realize sealing treatment, the bottom end of the polytetrafluoroethylene tube 2 is bonded with the outer wall of the graphite tube 7 through the second adhesive layer 24 to realize sealing treatment, and the first adhesive layer 23 and the second adhesive layer 24 are both formed by high-temperature-resistant adhesives. The high-temperature-resistant adhesive is prepared by uniformly mixing graphite fine powder and epoxy resin according to the mass ratio of 9: 20.
The outer diameter of the graphite tube 7 is 3mm smaller than the inner diameter of the polytetrafluoroethylene tube 2. The polytetrafluoroethylene tube 2 has an axial length greater than that of the graphite tube 7.
The top end of the graphite tube 7 is positioned above the top end of the polytetrafluoroethylene tube 2, and the bottom end of the graphite tube 7 is positioned above the bottom end of the polytetrafluoroethylene tube 2. The length of the top end of the graphite tube 7 exceeding the top end of the polytetrafluoroethylene tube 2 is consistent with the length of the bottom end of the graphite tube 7 being lower than the bottom end of the polytetrafluoroethylene tube 2.
Referring to fig. 8, the top end of the graphite tube 7 is provided with an annular groove 72 with a depth of 0.6mm, the bottom end of the graphite tube 7 is provided with an annular protrusion with a height of 0.6mm, the annular protrusion is matched with the annular groove 72 at the top end of the graphite tube 7, when the two combined tubes are connected, the first flange 4 of the first combined pipe can be matched and connected with the second flange 5 of the second combined pipe through bolts, meanwhile, the annular groove 72 at the top end of the graphite tube 7 of the first combined tube is matched with the annular bulge at the bottom end of the graphite tube 7 of the second combined tube, so that the top end surface of the graphite pipe 7 of the first combined pipe is matched and butted with the bottom end surface of the graphite pipe 7 of the second combined pipe, in order to enhance the sealing property, the sealing gasket is arranged at the matching connection position of the first flange 4 and the second flange 5, so that sealing between the combined pipes is realized, and the chemical liquid medium cannot corrode the flanges when flowing in the combined pipes.
In this document, the terms front, back, upper and lower are used to define the components in the drawings and the positions of the components relative to each other, and are used for clarity and convenience of the technical solution. It is to be understood that the use of the directional terms should not be taken to limit the scope of the claims.
The features of the embodiments and embodiments described herein above may be combined with each other without conflict.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (6)

1. The manufacturing method of the steel-lined polytetrafluoroethylene combined pipe is characterized by comprising the following steps of:
s1, connecting a flange at the top end and the bottom end of the steel pipe respectively, and polishing the lining of the steel pipe;
s2, tightly lining the polytetrafluoroethylene tube in the steel tube in a flanging mode;
s3, placing the inner pipe made of the substance A in a polytetrafluoroethylene pipe, uniformly filling fine powder of the substance A in the pores between the outer wall of the inner pipe and the inner wall of the polytetrafluoroethylene pipe, and then bonding the polytetrafluoroethylene pipe and the inner pipe by using an adhesive to realize sealing treatment, thus obtaining the steel-lined polytetrafluoroethylene combined pipe.
2. The method of claim 1, wherein the outer diameter of the inner tube is 3mm smaller than the inner diameter of the polytetrafluoroethylene tube.
3. The method of claim 1, wherein the polytetrafluoroethylene tube has an axial length greater than an axial length of the inner tube.
4. The method for manufacturing the steel-lined polytetrafluoroethylene composite pipe according to claim 1, wherein the substance A is any one of silicon carbide, silicon nitride and graphite.
5. The method for manufacturing the steel-lined polytetrafluoroethylene composite pipe according to claim 1, wherein the adhesive is prepared from a substance A and epoxy resin according to a mass ratio of 9: 20.
6. The method for manufacturing the steel-lined polytetrafluoroethylene composite pipe according to claim 1, wherein the flange is provided with bolt holes.
CN202010470864.5A 2020-05-28 2020-05-28 Method for manufacturing steel lining polytetrafluoroethylene combined pipe Pending CN111810729A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113714736A (en) * 2021-08-03 2021-11-30 湖北兴发凌志新材料有限公司 Rapid manufacturing method of steel lining polytetrafluoroethylene pipeline

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113714736A (en) * 2021-08-03 2021-11-30 湖北兴发凌志新材料有限公司 Rapid manufacturing method of steel lining polytetrafluoroethylene pipeline

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