CZ35448U1 - Equipment for checking the tightness of multilayer plastic pipes - Google Patents

Description

Equipment for checking the tightness of multilayer plastic pipes

Field of technology

The technical solution relates to a device for checking the tightness of a multilayer plastic pipe with an electrically conductive inner layer.

State of the art

The materials from which plastic pipes are made have high impermeability and chemical resistance, yet their mechanical failures occur. Damage occurs during their production, during transport, during their installation and subsequent operation. In addition to economic and ecological or health effects, such damage can have consequences for users. Therefore, it is necessary to check the pipelines from production to operation.

In practice, an increasing number of plastic pipes are used, and more layers are often used to improve their mechanical and other properties. Particularly popular are pipes with an aluminum liner, which, in addition to good mechanical and strength properties, significantly improve the subsequent work with them, because they are easy to shape, bend and connect others using press or screw parts.

Thanks to the smooth inner surface made of cross-linked polyethylene, they are characterized by a small pressure drop and do not suffer from scale build-up. The pipes also have an oxygen barrier and are not subject to corrosion. They are used not only for drinking water, but also for underfloor heating, for example.

At present, minor damage to the plastic layer occurs during the production process of plastic pipes with an aluminum liner. The production process itself takes place by applying a layer of plastic from the extruder to the aluminum liner. Subsequently, it gradually cools down. During these processes, the plastic layer may be damaged and cracks may form in the piping, which may cause fluid to leak from the system after installation. These leaks are often difficult to identify after installation and subsequent repairs, such as underfloor heating, are complex. Therefore, it is more advantageous to identify damage to the pipeline during production. Several technological methods are currently used to detect these damages. Although newer and new technologies are appearing on the market, which also serve to detect damage to the pipeline, one of the basic forms of inspection remains, in addition to visual inspection, ultrasonic inspection or laser inspection.

These known control procedures with existing monitoring devices have certain shortcomings, in particular weaker sensitivity, the need for more frequent calibration and, in the event of a fault, the entire production process is stopped. Subsequent restart of the process requires a relatively long time, sometimes several hours, which affects the efficiency of the process, increases energy and material consumption.

The aim of the technical solution is to design such a device for checking the tightness of multilayer pipes with an inner conductive layer, which would allow effective detection of leaks and, if necessary, accurate marking.

The essence of the technical solution

This object is achieved by a device for checking the tightness of a multilayer plastic pipe with an electrically conductive inner layer, according to a technical solution, the essence of which consists in that it comprises a measuring electrode arranged for the passage of the controlled plastic pipe,

-1 CZ 35448 The UI measuring electrode is connected by a high-voltage cable both to the high-voltage generator with power supply and to the device for sensing high-voltage pulses.

The advantage of the leak tester according to the technical solution is that it makes it possible to detect cracks in the plastic layer of the pipe with sufficient sensitivity, while the inspection can take place continuously at the outlet of the production line on the pipe.

According to a preferred embodiment, an acoustic-optical indication is connected to the high-voltage pulse sensing device.

According to a further preferred embodiment, a marking device for marking damaged points on the pipe, comprising a control unit, a pressure device and a paint container with a nozzle, is connected to the high-voltage pulse sensing device for immediate and automatic marking of the crack on the pipe.

Clarification of drawings

The technical solution will be described in more detail with reference to the attached drawing, where Fig. 1 schematically shows a production line for the production of a multilayer plastic pipe with an electrically conductive inner layer, on which a device for checking the tightness of multilayer plastic pipes with an electrically conductive inner layer is installed. solution; and FIG. 2 shows an exemplary embodiment of a device for checking the tightness of multilayer plastic pipes with an electrically conductive inner layer according to the technical solution.

Examples of technical solutions

Fig. 1 schematically shows a production line 1 for the production of a multilayer plastic pipe 2 with an electrically conductive inner layer. In the described exemplary embodiment, the electrically conductive inner layer is an aluminum insert. Production line 1 comprises a known extruder, which is not shown, which applies a layer of plastic to a continuously passing aluminum insert, which gradually cools. The finished pipe 2 passes through a tightness control device 3 and is subsequently stored in the storage space 4 of the manufactured pipe.

Fig. 2 schematically shows an exemplary embodiment of a device for checking the tightness of a multilayer plastic pipe 2 with an electrically conductive inner layer.

The leak tester comprises a measuring electrode 10 arranged so that a controlled plastic pipe 2 can pass continuously through this electrode.

The measuring electrode 10 is connected by a high-voltage cable 8 to a high-voltage generator 6, which is provided with a power supply 7, and to a device 9 for sensing high-voltage pulses.

An acousto-optical indication 5 is connected to the device 9 for sensing high-voltage pulses.

A marking device 15 for marking damaged areas on the pipe 2 is further connected to the high-voltage pulse sensing device 9. The marking device 15 comprises a control unit 11, a pressure device 12 and a paint container 13 connected to the nozzle 14.

The plastic pipe 2 with the aluminum insert passes continuously through the measuring electrode 10, and an electromagnetic field is generated by the high-voltage generator 6 via the high-voltage cable 8.

- 2 CZ 35448 Ul

If a pipe 2 having a crack in the plastic enters the measuring electrode 10, a high-voltage pulse occurs, which is detected by the high-voltage pulse sensing device 9, and the signal is transmitted to the acoustic-optical indication 5 of the high-voltage pulses, which then alerts the operator.

In the event of a crack in the pipe 2, the high-voltage pulse sensing device 9 also activates the marking device 15, the control unit 11 of which actuates the pressure device 12, so that from the paint reservoir 13 pressurized paint is applied to the damaged area of the pipe 2 in the pipe 2 it is thus marked with a colored mark.

Claims (3)

PROTECTION REQUIREMENTS 1. Leak test device for multilayer plastic pipe (2) with electrically conductive inner 5 a layer, characterized in that it comprises a measuring electrode (10) arranged for the passage of a controlled plastic pipe (2), the measuring electrode (10) being connected by a high-voltage cable (8) to a high-voltage generator (6) with a power supply (7); and on the one hand with a device (9) for sensing high-voltage pulses. me Leak test device according to Claim 1, characterized in that an acoustic-optical display (5) is connected to the high-voltage pulse sensing device (9). Leak test device according to Claim 1 or 2, characterized in that a marking device (15) for marking 15 damaged points on the pipe (2) comprising a pressure control unit (11) is connected to the high-voltage pulse sensing device (9). device (12) and ink container (13) with nozzle (14).