Steel lined teflon reducing pipe

Abstract

The application relates to the technical field of pipelines, in particular to a steel-lining Teflon reducer, which comprises a reducer part, one end of the reducer part is fixedly provided with a fixed flange, the other end is movably provided with a loose flange, the inner wall surface of the reducer part is provided with a polytetrafluoroethylene layer, and the inner wall surface of the polytetrafluoroethylene layer is provided with a polytetrafluoroethylene modified layer; the polytetrafluoroethylene modified layer has the property of conductivity through modification, and insulation is realized between the polytetrafluoroethylene modified layer and the reducer part through the polytetrafluoroethylene layer; the polytetrafluoroethylene modified layer arranged in the steel-lining Teflon reducer makes the polytetrafluoroethylene have the property of conductivity, the change of the resistance caused by the change of the cross-sectional area during cooperation and abrasion is utilized, the abrasion condition of the inner bushing of the steel-lining Teflon reducer is monitored by utilizing the change of the resistance, and the abrasion condition is more accurate and convenient.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pipelines, in particular to a steel lining Teflon reducer. BACKGROUND

[0002] The steel lining Teflon reducer is a pipeline connecting piece made of flanges and reducers with inner lining of Teflon plastic, and the outer body is usually made of carbon steel or stainless steel, which has high strength and mechanical properties and can withstand the pressure and external force in the pipeline system to provide support and protection for the entire pipe fitting, while the inner lining is made of Teflon, which has excellent chemical stability, corrosion resistance, high and low temperature resistance, and low friction coefficient, etc., and can prevent direct contact between the inner wall of the pipeline and the conveying medium to avoid corrosion and wear.

[0003] In actual use, since the core function of the reducer is to connect pipelines of different diameters, the structure of the cross-section mutation will cause a sharp change in the flow state of the fluid, resulting in a stronger scouring force on the inner lining, and at the variable diameter position, the fluid is easy to form turbulent flow or vortex flow, which will produce continuous stirring scouring on the inner wall. In the long-term use, the inner lining of the steel lining Teflon reducer is most prone to wear problems. In the prior art, it is difficult to monitor the wear degree of the Teflon lining of the steel lining Teflon reducer, and usually only regular disassembly inspection or life estimation can be performed, which not only has extremely low accuracy, but also affects the engineering operation and is inconvenient to use. SUMMARY

[0004] The present application aims to provide a steel lining Teflon reducer to solve the problems in the background art.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solution: a steel lining Teflon reducer, comprising a reducer portion, one end of the reducer portion is fixedly provided with a fixed flange, the other end is movably provided with a movable flange, the inner wall surface of the reducer portion is provided with a Teflon spacer layer, and the inner wall surface of the Teflon spacer layer is provided with a Teflon modified layer.

[0006] The Teflon modified layer is modified to have conductive properties, the Teflon modified layer and the reducer portion are insulated through the Teflon spacer layer, annular stepped grooves are formed at both ends of the Teflon modified layer, copper foil rings are arranged in the annular stepped grooves, and the copper foil rings are in conductive connection with both ends of the Teflon modified layer, so as to monitor the resistance change of the Teflon modified layer.

[0007] The Teflon modified layer is modified by adding 2%-5% of graphene to have conductive properties.

[0008] The side surface of the copper foil ring away from the polytetrafluoroethylene modified layer is attached with an insulating film, and the copper foil ring is provided with a connecting contact piece.

[0009] An annular cavity is formed in the fixed flange, the annular cavity is coaxial with the fixed flange, an inertia ring is arranged in the annular cavity, hemispherical grooves are formed in the two side surfaces of the inertia ring, and steel balls are movably arranged in the hemispherical grooves.

[0010] A piston wall pipe is fixedly arranged on the inner wall surface of the annular cavity and located at the inner side of the inertia ring, and a piston part is arranged in the piston wall pipe and in sealing sliding contact with the inner wall surface of the piston wall pipe.

[0011] A connecting shaft is fixedly arranged on the piston part, an arc surface pressing rod is fixedly arranged at the end of the connecting shaft, the arc surface pressing rod is in extrusion contact with the inner wall surface of the inertia ring, a limiting insertion shaft is fixedly arranged on the arc surface pressing rod, a limiting side plate is fixedly arranged on the piston wall pipe, and the limiting insertion shaft penetrates through the limiting side plate so that the arc surface pressing rod is vertically limited.

[0012] An arc-shaped elastic sheet is arranged on the outer side of the arc surface pressing rod, the arc-shaped elastic sheet applies elastic pressure to the arc surface pressing rod, and the arc surface pressing rod has an elastic tendency of moving towards the direction of the inertia ring.

[0013] An intercommunication loop and a communication cavity are formed in the fixed flange, the ends of the piston wall pipe are in communication with the intercommunication loop, and the intercommunication loop is in communication with the communication cavity.

[0014] An arc-shaped piston pipe is fixedly arranged on the surface of the fixed flange, the end of the arc-shaped piston pipe is in communication with the communication cavity, an arc-shaped plug shaft is arranged in the arc-shaped piston pipe, when the inertia ring moves radially relative to the fixed flange, the piston part is driven by the inertia ring, the medium in the piston wall pipe enters the arc-shaped piston pipe through the intercommunication loop and the communication cavity, and the arc-shaped plug shaft is driven to extend by a corresponding distance.

[0015] An end clamping block is fixedly arranged at the end of the arc-shaped plug shaft, a limiting clamping plate is fixedly arranged on the surface of the reducer pipe part, a clamping block side groove is formed in the end clamping block, and the limiting clamping plate is clamped in the clamping block side groove to support the end clamping block.

[0016] A drawing pen head is embedded and arranged on the end clamping block, and an arc-shaped sticker is attached to the surface of the fixed flange, when the arc-shaped plug shaft extends and moves, the drawing pen head is driven to draw on the surface of the arc-shaped sticker to record the trajectory.

[0017] Compared with the prior art, the present application has the following advantages:

[0018] The PTFE modified layer in the steel-lined PTFE reducer of this invention modifies the PTFE to make it conductive. Combined with the change in resistance caused by the change in cross-sectional area during wear, the wear condition of the inner bushing of the steel-lined PTFE reducer can be monitored by using the change in resistance. Compared with the traditional disassembly detection or prediction method, it is not only more accurate, but also more convenient to use.

[0019] This invention, through the combination of an inertial ring, an arc-shaped piston tube, and an arc-shaped sticker, can record and visually display the radial vibration and impact amplitude experienced by the PTFE-lined reducer during historical use, facilitating worker inspections and further improving ease of use. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0021] Figure 2 This is another schematic diagram of the overall structure of the present invention.

[0022] Figure 3 This is a schematic diagram showing the separation of the copper foil ring and the insulating film in this invention.

[0023] Figure 4 This is a three-dimensional half-sectional schematic diagram of the present invention.

[0024] Figure 5 This is a partial three-dimensional cross-sectional view of the present invention.

[0025] Figure 6 This is a partial front view of the three-dimensional half-section of the present invention.

[0026] Figure 7 This is a three-dimensional half-sectional view of the fixed flange of the present invention at a horizontal angle.

[0027] In the diagram: 1. Reducer section; 2. Fixed flange; 3. Loose flange; 4. PTFE partition; 5. PTFE modified layer; 6. Annular stepped groove; 7. Copper foil ring; 701. Insulating film; 702. Connecting contact piece; 201. Annular cavity; 202. Inertia ring; 203. Hemispherical groove; 204. Steel ball; 205. Piston wall tube; 206. Piston section; 207. Connecting shaft; 208. Arc-shaped pressure rod; 209. Limiting insert shaft; 210. Limiting side plate; 211. Arc-shaped spring; 212. Interconnecting loop; 213. Connecting cavity; 214. Arc-shaped piston tube; 215. Arc-shaped plug shaft; 216. End locking block; 217. Limiting locking plate; 218. Locking block side groove; 219. Painting pen tip; 220. Arc-shaped sticker. Detailed Implementation

[0028] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0029] As shown in Figures 1 to 7 The present application provides a technical solution: a steel lining four-fluorine reducing pipe, comprising a reducing pipe part 1, the reducing pipe part 1 has different diameters at two ends, one end of the reducing pipe part 1 is integrally machined and fixedly provided with a fixed flange 2, the other end is movably provided with a movable flange 3, the inner wall surface of the reducing pipe part 1 is provided with a polytetrafluoroethylene layer 4, and the inner wall surface of the polytetrafluoroethylene layer 4 is provided with a polytetrafluoroethylene modified layer 5; the polytetrafluoroethylene modified layer 5 has conductivity by modification, the polytetrafluoroethylene modified layer 5 is modified by adding 2%-5% of graphene, so as to have conductivity, and the graphene forms a continuous conductive network in the matrix through direct contact and tunnel effect by virtue of the excellent conductivity of the graphene, and the electrons realize directional migration through the passages. Meanwhile, the addition of the graphene can also improve the wear resistance of the polytetrafluoroethylene modified layer 5, the graphene disperses external force in the friction process to the lamellar structure of the graphene by load transfer, so as to reduce micro cracks and peeling of the polytetrafluoroethylene matrix due to local stress concentration; therefore, the polytetrafluoroethylene lining of the steel lining four-fluoro reducing pipe is not negatively affected.

[0030] The polytetrafluoroethylene modified layer 5 and the reducing pipe part 1 are insulated by the polytetrafluoroethylene layer 4, the polytetrafluoroethylene layer 4 is made of polytetrafluoroethylene material and does not need to be modified, the insulation performance of the polytetrafluoroethylene itself is used as an insulation base, annular stepped grooves 6 are formed at two positions of the polytetrafluoroethylene modified layer 5, copper foil rings 7 are arranged in the annular stepped grooves 6, and the two ends of the polytetrafluoroethylene modified layer 5 are connected in conduction by the copper foil rings 7, so as to monitor the resistance change of the polytetrafluoroethylene modified layer 5.

[0031] As shown in Figure 3 The surface of the copper foil ring 7 away from the polytetrafluoroethylene modified layer 5 is provided with an insulating film 701, the copper foil ring 7 is clamped between end faces when the steel lining four-fluoro reducing pipe is installed in pipeline butt joint, and the copper foil ring 7 avoids forming a conduction path with a matched pipeline, a connecting contact piece 702 is connected and arranged on the copper foil ring 7, and the connecting contact piece 702 is used as a detection electrical connection pin.

[0032] An annular cavity 201 is formed in the fixed flange 2, the annular cavity 201 is coaxial with the fixed flange 2, an inertia ring 202 is arranged in the annular cavity 201, hemispherical grooves 203 are formed in the two side surfaces of the inertia ring 202, and steel balls 204 are movably arranged in the hemispherical grooves 203, and the inertia ring 202 is in rolling contact with the inner wall surface of the annular cavity 201 through the steel balls 204.

[0033] A piston wall pipe 205 is welded and fixed on the inner wall surface of the annular cavity 201, and the piston wall pipe 205 is located on the inner side of the inertia ring 202; a piston part 206 is arranged in the piston wall pipe 205, and the piston part 206 is in sealing sliding contact with the inner wall surface of the piston wall pipe 205. A connecting shaft 207 is welded and fixed on the piston part 206, an arc surface pressing rod 208 is welded and fixed on the end of the connecting shaft 207, the arc surface pressing rod 208 is in extrusion contact with the inner wall surface of the inertia ring 202, a limiting insertion shaft 209 is welded and fixed on the arc surface pressing rod 208, a limiting side plate 210 is welded and fixed on the piston wall pipe 205, and the limiting insertion shaft 209 penetrates through the limiting side plate 210, so that the arc surface pressing rod 208 is vertically limited.

[0034] An arc-shaped elastic sheet 211 is arranged on the outside of the arc surface pressing rod 208, the arc-shaped elastic sheet 211 applies elastic pressure to the arc surface pressing rod 208, so that the arc surface pressing rod 208 has an elastic tendency of moving in the direction of the inertia ring 202.

[0035] An intercommunication loop 212 and a communication cavity loop 213 are formed in the inside of the fixed flange 2, the ends of the piston wall pipe 205 are in communication with the intercommunication loop 212, as shown in Figure 6 and Figure 7 , the number of the piston wall pipe 205 is several groups, Figure 7 and eight groups are taken as an example, the ends of the eight groups of piston wall pipes 205 are in communication through the intercommunication loop 212, so that the piston parts 206 in part of the piston wall pipes 205 can be extruded and driven to different degrees when the inertia ring 202 moves radially, and the intercommunication loop 212 and the communication cavity loop 213 are in communication with each other.

[0036] An arc-shaped piston pipe 214 is welded and fixed on the surface of the fixed flange 2, the end of the arc-shaped piston pipe 214 is in communication with the communication cavity loop 213, and an arc-shaped plug shaft 215 is arranged in the arc-shaped piston pipe 214; when the inertia ring 202 moves radially relative to the fixed flange 2, the piston part 206 can be driven by the inertia ring 202, so that the medium in the piston wall pipe 205 enters the arc-shaped piston pipe 214 through the intercommunication loop 212 and the communication cavity loop 213, and the arc-shaped plug shaft 215 is driven to extend by a corresponding distance.

[0037] An end block 216 is welded and fixed to the end of the arc-shaped plug shaft 215. A limiting plate 217 is welded and fixed to the surface of the reducing pipe section 1. A side groove 218 is provided on the end block 216. The limiting plate 217 is limited and locked in the side groove 218 to support the end block 216.

[0038] A drawing pen tip 219 is embedded in the end block 216, and an arc-shaped sticker 220 is affixed to the surface of the fixed flange 2. When the arc-shaped plug shaft 215 extends and moves, the drawing pen tip 219 is driven by the end block 216 to draw on the surface of the arc-shaped sticker 220 to record the trajectory. The arc-shaped sticker 220 can be replaced to achieve cyclic use.

[0039] When the steel-lined PTFE reducer of the present invention is in use, the external resistance detection device is connected to the copper foil ring 7 through the connecting contact piece 702, and electrically connected to both ends of the PTFE modified layer 5 through the copper foil ring 7, thereby detecting the resistance of the PTFE modified layer 5.

[0040] Resistance formula , Resistivity For length, Let be the cross-sectional area. According to the formula above, with a constant resistivity and length, the cross-sectional area of ​​the PTFE modified layer 5 will decrease as it wears down, leading to an increase in resistance. Although the PTFE modified layer 5 has uneven thickness, the above variation still applies. For PTFE modified layers 5 of varying thicknesses, they can be divided into countless tiny uniform segments along the axial direction, and the sum of these segments can be calculated. An increase in the resistance of any small segment will increase the total resistance.

[0041] Since wear is determined by changes in resistance, continuous monitoring is required when a medium is flowing through the PTFE-lined reducer. The medium must be an insulating medium, such as organic solvents like ethanol or acetone, oils like engine oil or diesel, or deionized water. If a non-insulating medium is being transported through the PTFE-lined reducer, the reducer must be emptied before monitoring can begin.

[0042] In actual use, the most significant impact vibration on PTFE-lined reducers is the radial impact force perpendicular to the pipe. This radial impact force, perpendicular to the pipe axis, can cause the pipe to bend or deform laterally. Furthermore, there is a certain degree of frictional movement between the flange connection end faces, posing a risk of lining peeling and cracking, as well as leakage between the end faces. Therefore, it is necessary to monitor the radial impact forces historically experienced by PTFE-lined reducers in actual use.

[0043] like Figure 4 and Figure 5As shown, when the PTFE-lined reducer is subjected to radial impact, due to the inertia of the inertia ring 202, a radial relative movement will occur between the inertia ring 202 and the fixed flange 2, such as... Figure 6 As shown, when the inertial ring 202 moves radially, it compresses the arc-shaped pressure rod 208, causing the piston portion 206 to move axially inside the piston wall tube 205. The medium in the piston wall tube 205 enters the connecting cavity 213 through the interconnecting loop 212, and then drives the arc-shaped plug shaft 215 to extend through the arc-shaped piston tube 214.

[0044] The greater the radial impact force on the steel-lined PTFE reducer, the greater the compression amplitude of the inertia ring 202 on the arc-shaped pressure rod 208, resulting in a greater axial movement distance of the piston section 206, more medium output from the piston wall tube 205, and a greater extension length of the arc-shaped plug shaft 215.

[0045] like Figure 2 As shown, during the extension of the arc-shaped plug shaft 215, the end locking block 216 drives the drawing pen tip 219 to draw on the surface of the arc-shaped sticker 220, leaving a trace record. The trace length reflects the magnitude of the radial impact force that the steel-lined PTFE reducer has historically suffered. Workers can directly check the trace length during inspections, and focus on checking pipe sections with longer trace lengths.

[0046] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A steel lined Teflon reducing pipe, comprising a reducing pipe part, one end of the reducing pipe part is fixedly provided with a fixed flange, and the other end is movably provided with a loose flange, characterized in that: The inner wall surface of the reducing pipe part is provided with a polytetrafluoroethylene layer, and the inner wall surface of the polytetrafluoroethylene layer is provided with a polytetrafluoroethylene modified layer; The polytetrafluoroethylene modified layer is modified to have conductive properties, the polytetrafluoroethylene modified layer and the reducing pipe part are insulated through the polytetrafluoroethylene layer, annular stepped grooves are formed at both ends of the polytetrafluoroethylene modified layer, copper foil rings are arranged in the annular stepped grooves, and the copper foil rings are in conductive connection with both ends of the polytetrafluoroethylene modified layer, so that the resistance change of the polytetrafluoroethylene modified layer can be monitored. An annular cavity is formed in the fixed flange, the annular cavity is coaxial with the fixed flange, an inertia ring is arranged in the annular cavity, hemispherical grooves are formed in the two side surfaces of the inertia ring, steel balls are movably arranged in the hemispherical grooves, and the inertia ring is in rolling contact with the inner wall surface of the annular cavity through the steel balls.

2. A steel lined four fluorine reducing pipe according to claim 1, characterized in that: The polytetrafluoroethylene modified layer is modified by adding 2%-5% graphene to have conductive properties.

3. A steel lined four fluorine reducing pipe according to claim 1, characterized in that: The side surface of the copper foil ring away from the polytetrafluoroethylene modified layer is provided with an insulating film, and a connecting contact piece is connected to the copper foil ring.

4. A steel lined four fluorine reducing pipe according to claim 1, characterized in that: The arc-shaped elastic sheet is arranged on the outer surface of the arc-shaped pressing rod, and the arc-shaped elastic sheet applies elastic pressure to the arc-shaped pressing rod, so that the arc-shaped pressing rod has an elastic tendency to move towards the inertia ring.

5. A steel lined Teflon reducing pipe according to claim 1, characterized in that: The fixed flange is internally provided with an intercommunication loop and a communication cavity, the end of the piston wall pipe is in communication with the intercommunication loop, and the intercommunication loop is in communication with the communication cavity.

6. A steel lined Teflon reducing pipe according to claim 5, characterized in that: The surface of the fixed flange is fixedly provided with an arc-shaped piston pipe, the end of the arc-shaped piston pipe is in communication with the communication cavity, and an arc-shaped plug shaft is arranged in the arc-shaped piston pipe; when the inertia ring moves radially relative to the fixed flange, the piston part is driven by the inertia ring, so that the medium in the piston wall pipe enters the arc-shaped piston pipe through the intercommunication loop and the communication cavity, and the arc-shaped plug shaft is driven to extend by a corresponding distance.

7. A steel lined four fluorine reducing pipe according to claim 6, characterized in that: The end of the arc-shaped plug shaft is fixedly provided with an end clamping block, the surface of the reducing pipe part is fixedly provided with a limiting clamping plate, a clamping block side groove is formed in the end clamping block, and the limiting clamping plate is clamped in the clamping block side groove to support the end clamping block.

8. A steel lined four fluorine reducing pipe according to claim 7, characterized in that: A painting pen head is embedded and mounted on the end clamping block, and an arc-shaped sticker is attached to the surface of the fixed flange; when the arc-shaped plug shaft extends, the painting pen head is driven to paint on the surface of the arc-shaped sticker to record the trajectory.

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