Method of connection of multi-layer metal-polymer pipes

FIELD: machine building.

SUBSTANCE: here is disclosed method for connection of multi-layer metal-polymer pipes. Pipes are connected by welding through a connecting device having not less, than two connecting elements with seats for end sections of pipes. Welding is performed along external, internal and end surfaces of the end section of the pipe enveloped with internal surfaces of the seat of the connecting device. Also, the end section of the pipe and seat of the connection device are preliminary simultaneously heated. Successively, preliminary heated sections of the pipe and the connection device are matched. To avoid destruction of polymer layers and exposure of an internal metal layer and for removal of adhesion layers of the pipe applied on the metal layer the end section of pipe is heated to softening temperature of material of external and internal layers of the pipe at pipe and the connecting device matching. The seat of the connecting device is made in form of a circular slot coaxial with an internal orifice of the connecting element of the connecting device. The circular slot has a cylinder wall from the side of external surface of a connected pipe and a conic wall truncated along plane of the end of the connecting element from the side of internal surface of the connected pipe. The seat is preliminary heated to melting temperature of material of the connecting device. The end section of the pipe and seat are preliminary heated by means of a welding device equipped with a control unit and a heater whereon there are arranged a tool of the pipe and a tool of fitting. Temperature of the heater and tool of fitting directly contacting surface of the heater equal to temperature of connecting device material melting is set with the control unit and is maintained at a constant level within ranges of preset error. Securing the tool of the pipe on the heater through a transit bush facilitates limit of end section of the pipe heating to temperature not exceeding softening temperature of material of external and internal layers of the pipe. The tool of the pipe can travel along axis of the transit bush for adjustment of heating temperature at external conditions change.

EFFECT: upgraded quality and reliability of connection of multi-layer metal-polymer pipes.

7 dwg

 

The invention relates to compounds of plastics, and more specifically to the connection of the multilayer metal pipes, and can be used, for example, during installation of piping systems for hot and cold water.

Currently, widespread technology of pipelines of a multilayer metal pipes, the outer and inner layers are made of a polymeric material. Option five-layer structure, this pipe is presented in figure 1. The tube has an external polymer layer 1, the adhesive coating 2 and 4, the aluminum layer 3 and the inner polymer layer 5.

In the manufacture of pipelines from such pipes connecting them perform, usually with the help of the screw (compression) fittings (SP 40-103-98 group G, a set of rules for design and construction. Design and installation of piping systems for hot and cold domestic water supply using a metal pipe; SP 41-102-98 Group G. The set of rules for design and construction. Design and installation of pipelines of heating systems using metal tubes or using press fittings (for example, press-fitting HERZ) (http://www.herz-vl/d/67920/d/hress-fitingi_gerc.pdf).

The disadvantages connections with threaded fittings include possible errors during installation (dostatochno tightened thread) the need for periodic monitoring during operation, as tightening the crimp nuts with time waning, and you receive the leakage at the connection. When using press-fitting connection seems to be much more reliable and durable. However, both methods have sophisticated technology and a large number are required for installation of the pipeline components.

At the same time installations of single-layer plastic pipes are widely used methods of permanent connection of pipes made of thermoplastic material without dissolving or changing the chemical composition, solely due to the heating. The most widely used method of welding heated tool butt (http://www.polyplastic.ru), temperature resistant welding using fittings with embedded heaters (http://www/etp/com/ua/news/vid_svarki.html and the method of welding heated tool socket using fittings (http://www.polyplastic.ru).

When welding a butt joint, as shown in figure 1, the heating of the welded surfaces is heated metal tool. The method consists in heating the ends of the pipes being welded to melt the material and subsequent compression of the heated ends to cool. To obtain high-quality welded joint requires certain conditions. The main process parameter t is aetsa temperature of the welding tool which must be maintained constant with an accuracy of ±10 K. the Time of heat - melting the ends of the welded pipe welding tool depends on the ambient temperature, the wall thickness of pipes, preparation of pipe ends for welding. The reduction in the duration of heating at a constant temperature of the instrument leads to the insufficient softening of the material and, as a consequence, the quality of the weld. The exact observance of the heating time does not always guarantee a stable depth of heating, it may vary depending on environmental conditions. When heated welding tool should touch the edges of the pipes around the perimeter. When properly managed process around the perimeter of the pipe shall be formed uniform beads of molten material in the form of a roller with a height not more than 2-3 mm After sealing the pipe ends must be removed quickly heater and to produce draft tubes. The time between the removal of the heater and draft tubes should not exceed a certain value, otherwise there will be a decrease in strength of the weld as a result of rapid cooling of the welded surfaces. With increasing pressure precipitation is excessive extrusion of the melted material inside and outside of the pipe, resulting in poor weld quality. The duration of cooling under pressure is eaten is determined based on the wall thickness of the welded pipe, the ambient temperature and the type of plastic. Welded joint must withstand under pressure to complete cooling of the material, since the movement of the pipe ends immediately after welding can lead to the creation of the joint additional internal stresses.

Temperature resistant welding or welding with the use of fittings with mortgage heating element, one embodiment of which is presented in figure 3, is one of the most powerful methods of welding. Its essence lies in the supply of electricity to the heating element (wire)located on the inner part of the molded fittings (fitting). The wire is heated by passing through it an electric current, and under the influence of heat the joined surface of the pipe and fitting fused and welded together.

A device for connecting multi-layer composite pipes (Patent RU №93127, F16L 13/00, 20.04.2010), made in the form of coupling with the internal mounting element with a cylindrical socket, covering the inner end and outer surface of the pipe, the wall of the cylindrical socket is pressed or selected when casting clutch mortgage heating element to melt the inner, outer and end layers of the coupling and the pipe connected to the outside of the coupling terminals for connection to the source is the infrared continuous or pulsed electric current.

When heated to the melting temperature of the material of the coupling of linear thermal elongation of the laying of the heating element can lead to a rapprochement between its coils and form groups overheating of local areas, which will lead to increased deep heating pipes and couplings and, as a consequence, deformation of their surfaces.

When welding socket, illustrated in figure 4, with the welding fixture welded pipe 5 and the connecting element (fitting) 1. Welding fixture consists of a tool fitting 2 and instrument tubes 4, which are mounted on the heater 3. The external surface of the pipe is heated by the tool pipe, while the inner surface of the fitting is heated tool fitting. Upon reaching the melting of the outer surface of the pipe and the inner surface of the fitting welding fixture is removed from the weld zone, and the pipe and fitting are combined and cooled.

This is the most automated way of well-known and widely used in practice due to high quality and reliability with its connection single-layer plastic pipes. However, due to design features multi-layered metal pipes, this method has not found wide application for their connection.

The challenge aimed claimed from Britanie, is to develop ways to connect multilayer plastic pipes, not inferior in processability and quality of the connection method of the single-layer tubes of thermoplastic material heated tool with fittings. This design features a metal pipe define additional requirements:

- to produce high quality and reliable connections multilayer metal pipe welding them with the fitting must be carried on the outer surface of the outer polymer layer and the inner surface of the inner polymeric layer of the pipe;

in the process of welding should be avoided destruction and deformation sufficiently thin polymer and adhesive layers of the pipe and the internal exposure of the metal layer of the pipe, as otherwise reliable coupling of the welded surfaces of the pipe and the fitting is not possible.

The closest analogue is the way to connect the multilayer composite pipes and device for its implementation (Patent RU No. 2380603, F16L 13/00, 27.01.2010), selected as a prototype, according to which the multilayer composite pipe connected through fittings by welding. This welding is carried out simultaneously along the cylindrical and end surfaces of the pipes to do this at the same time the pre-rspl the keys external the inner and end surfaces on the end portion of the tube and connected to the pipe inner surface of the fitting. A fitting for connecting the multilayer composite pipes made in the form of coupling with the internal mounting element with a cylindrical socket, covering the inner end and outer surface of the pipe.

This method does not exclude destruction of the material, possible overheating of the polymer layers of the end sections adjacent pipes, and, as a consequence, obtaining poor pipe connections. In addition, during heating of the fitting has direct contact with the heating tool and the end section of the inner wall of the fastener fitting, which becomes plastic and under the pressure of excess molten polymer changes its geometry, thus reducing the sectional area of the bore hole of the fitting. Excess molten polymer is extruded into the inner part of the fitting, also reducing the sectional area of the bore hole. This, in turn, will lead to an increase of hydraulic losses and the increase in noise during the transportation of liquids by pipeline.

Technical result achieved in the claimed invention is to improve the quality and reliability of multilayer metal pipe.

Technical result is achieved by the eat, the connection of the multilayer metal pipe welding method is performed via a connecting device having at least two connecting elements with mounting slots for the end sections of pipes. Mounting slot of each of the connecting element is designed as coaxial with the inner bore of the connecting element annular groove with a cylindrical wall from the outer surface of the joining pipe and conical, truncated by the plane of the end face of the connecting element, the side wall inner surface of the joining pipe. Welding is carried out on outer, inner and end surfaces of the end portion of the tube covered by the inner surfaces of the landing slots of the connecting device. Welding is carried out with the prior, simultaneous heating of the end portion of the tube and landing slots of the connecting device and the subsequent combination of the pre-heated sections of pipe and coupling devices. At the same time to avoid destruction of the polymer layers, the exposed inner metal layer and removing deposited on a metal layer of the adhesive layers of the pipe when combining it with the coupler end portion of the tube is heated to the softening temperature of the material in asnago and inner layers of the pipe. Mounting slot of the connecting device is heated to the melting temperature of the material of the connecting device. Pre-heating of the end portion of the tube and landing slots connecting device is performed using a welding device having a control unit and a heater, which are the tool of the pipe and the tool fitting. The temperature of the heater and instrument fitting, having direct contact with the surface of the heater is equal to the melting point of the material of the connecting device is set by the control unit and supported them at a constant level within a given margin of error. Limit heating of the end portion of the tube to a temperature not exceeding the softening temperature of the material of the outer and inner layers of the pipe, is provided by clamping the pipe to the heater via the adapter sleeve. To adjust the heating temperature when ambient conditions change tool pipe can be moved along the axis of the transition sleeve.

The connecting device, the construction of which is illustrated figure 5, has at least two connecting elements for end stations connected pipes, each of which is made with a mounting socket in the form of coaxially with the inner bore of the mounting is of lament annular groove with a cylindrical wall 2 from the outer surface of the transition pipe and tapered, truncated by the plane of the end face of the connecting element, the wall 1 from the inner surface of the joining pipe.

The welding device, the device which is illustrated in Fig 6, is made with the heater 3, which are the tool of the pipe 1 and the tool fitting 5, and a control unit 4, is functionally associated with the heater. Heater welding fixtures made with located in the body of the heater heating element 6, the operation mode is set and maintained by the control unit. The tool fitting is made in the form of a sleeve with a slot for fitting on the side of one of its ends. The nest is made in the form of an annular cylindrical groove. The tool fitting is in direct contact with the surface of the heater. The temperature of the heater and instrument fitting, equal to the melting point of the material of the fitting is set and maintained at a constant level by using the control unit. The tool tube is made in the form of a sleeve with the socket end of the pipe section from one of the ends. The nest is made in the form of an annular cylindrical groove coaxially with the inner mounting sleeve opening. To ensure heating of the end portion of the tube to the softening temperature of the polymeric material layers, pipe tool, pipe attached to the heat is the motor through reducer sleeve 2. To adjust the heating temperature when ambient conditions change tool pipe can be moved along the axis of the transition sleeve.

The process of welding the pipe and the fitting illustrated by Fig.7. Heater welding fixtures within the time determined by the process parameters depending on the material of the outer and inner layers of the pipe and the connecting device is heated to a predetermined temperature. Then the end portion of the tube is inserted in the tool pipe welding device, the connecting device is inserted into the tool fitting welding fixtures and fixed in the welding device during heating. Outer, inner and end surfaces of the end portion of the tube heated by the tool tube to the softening temperature of the material of the outer and inner layers of the pipe. At the same time mounting slot of the connecting device is heated tool fitting to the melting temperature of the material of the connecting device. However due to the lack of direct contact surface of the tool fitting welding fixture with the surface of the end section of the conical wall of the landing slots connecting device no deformation occurs final stage of landing slots of the connecting device. P is the elapsed time of the heat pipe and the connecting device are simultaneously extracted from the welding fixture. The heated end of the pipe section is then pushed into the heated mounting slot of the connecting device and then secured in a fixed position. The surface of the inner and outer layers of the end portion of the tube in the process of heat transfer from the heated to the higher temperature surface landing slots connecting device is heated to the melting temperature of the material of the inner and outer layers of the pipe, thereby providing a high quality connection. The polymeric layers of the end portion of the pipe is not deformed and does not move relative to the inner metal layer of the pipe. Excess molten polymer, filling the space between the conical wall of the landing slots and the inner surface of the end section of the pipe, not squeezed into the inner hole of the connecting device and does not deform the end portion inner wall of the landing slots. After complete cooling of the welded connection is ready.

This method can be used to connect a single-layer plastic pipes, as well as to connect the single-layer plastic pipes with multi-layer metal pipe installations with high requirements to the quality and reliability of the joints of pipes.

The connection method of a multilayer metal is polimernyh pipe by welding the connecting device, having at least two connecting elements with mounting slots for end pipe sections, the outer, inner and end surfaces of the end portion of the tube covered by the inner surfaces of the landing slots connecting devices with advanced simultaneous heating of the end portion of the tube and landing slots of the connecting device and the subsequent combination of the pre-heated sections of pipe and coupling devices, characterized in that to avoid destruction of the polymer layers, the exposed inner metal layer and removing deposited on a metal layer of the adhesive layers of the pipe when combining it with the coupler end portion of the tube is heated to the softening temperature of the material of the outer and inner layers of the pipe, and mounting slot connecting device made in the form of coaxially with the inner bore of landing slots of the connecting element of the connecting device ring groove with a cylindrical wall from the outer surface of the joining pipe, and a conical, truncated by the plane of the end face of the connecting element, the side wall inner surface of the joining pipe is heated to the melting temperature of the material of the connecting condition the device, however, preliminary heating of the end portion of the tube and landing slots connecting device is performed using a welding device having a control unit and a heater, which are the tool of the pipe and the tool fitting, the temperature of the heater and instrument fitting, having direct contact with the surface of the heater is equal to the melting point of the material of the connecting device is set by the control unit and supported them at a constant level within a given error, while limiting the heating of the end portion of the tube to a temperature not exceeding the softening temperature of the material of the outer and inner layers of the pipe, is provided by clamping the pipe to the heater through a reducer sleeve, for setting the heating temperature when ambient conditions change tool pipe can be moved along the axis of the transition sleeve.



 

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