RU90530U1 - REMOTE CONTROL UNIT FOR HUMIDIFICATION OF THE HEAT-INSULATING LAYER IN HOT WATER PIPELINES - Google Patents

Abstract

A device for remote control of the wetting of the heat-insulating layer in hot water pipelines, consisting of two copper indicator conductors located in the heat-insulating layer of pipelines running along the entire length of the pipelines, bellows expansion joints and fixed shield supports, where one of the conductors is signal and the other is transit; as a means of connecting the indicator conductors at the monitoring and transit points, a connection element in polymer insulation was used, and in the places of transit the signal conductor of the pipelines is connected to the signal conductor of the subsequent pipeline, and the transit conductor is connected to the transit, and in the places of control the signal and transit conductors are through the connection element displayed in the control unit, characterized in that the connection element in the places of control and transit is made in the form of a flat three-core copper cable in a polymer from lyatsii containing three copper conductor, each having a diameter of 1.3-1.5 mm in parallel spaced apart at a distance of 6-28 mm, and is further set to bellows, the fixed shield supports and end members.

Description

This device is designed to monitor the state of humidification of the insulating layer of hot water pipelines.

Currently, to monitor the state of humidification of the heat-insulating layer of hot water pipelines, an online remote control device (UEC) is used to humidify the heat-insulating layer of heat pipes based on the RK-150-7-31 coaxial cable with wave impedance (Zvk) = 150 Ohms and a matching device. (Instructions for the design and installation of operational remote control systems for wetting polyurethane foam insulation (PUF) of pre-insulated heat pipes (in addition to the code of rules SP 41-105-2002) dated 06.06.05, pp. 6-8)

The device for operational remote control (UEC) for moistening polyurethane foam insulation (PUF) of pre-insulated heat conductors consists of copper conductors - indicators (signal and transit) in the heat-insulating layer of the heat conduit and a connection element including a coaxial cable of the grade RK-150-7-31 with corrugated steel core in polyethylene insulation and matching device used to match the wave resistance of the coaxial cable RK-150-7-31 with the wave resistance of copper conductors cators.

This device does not allow to accurately localize the wetting section of the heat-insulating layer, especially with a significant length of the pipeline, due to the heterogeneity of the test signal in the coaxial cable RK-150-7-31 and copper conductors-indicators (signal and transit) in the heat-insulating layer of the heat conduit, which is due to the different diameter of the conductors (in RK-150-7-31 = 0.25 mm; copper conductor indicator = 1.4 mm), the difference in the wave impedances of the coaxial cable RK-150-7-31 and the copper conductor indicator in heat the insulating layer of the pipeline, the difference in the propagation time of the signal in the line matching device - coaxial cable and copper conductors indicators. In this case, during refractometry, at the moment of passing the test signal through the switching sections, a coaxial cable - a matching device and a matching device - conductor-indicator, a group of different-amplitude peaks located above and below the isoline are recorded, which can mask or simulate the wetting areas of the heat-insulating layer. Installation of matching devices complicates the installation process.

The technical result of the proposed device is to increase the accuracy of the localization of the wetting section of the heat-insulating layer of the hot water heat pipe by reducing the difference in wave impedances of the connecting element in the form of a flat three-core cable with three copper conductors and pipeline indicator wires, as well as simplifying the installation process by reducing the number of device elements.

Since in the proposed device the diameter of the copper conductor indicator in the heat-insulating layer of the heat conductor (1.3 mm - 1.5 mm) is equal to the diameter of the conductor in a flat three-core cable (1.3 - 1.5 mm), their wave impedances are equal and the propagation time the signal in a flat three-core cable and copper conductors-indicators are equal, then with refractometry the pattern of uniform passage of the test signal through the elements of the system is recorded.

The task is achieved due to the fact that in the device for remote control of the humidification of the heat-insulating layer in hot water pipelines, consisting of two copper indicator conductors (2), located in the heat-insulating layer of pipelines running along the entire length of the pipelines, where one of the conductors is a signal and another in transit, as a means of connecting the indicator conductors in the places of control (5) and transit (4), a connection element (3) in polymer insulation was used, and in places of transit (4) the signal conductor (2) of the pipelines is connected to the signal conductor (2) of the subsequent pipeline, and the transit (2) to the transit (2), and in the places of control (5) the signal and transit conductors (2) are led through the connection element (3) to control unit (6), where the operator connects the measuring device (7).

Also, the connection element (3) made in the form of a flat three-core copper cable in polymer insulation, consisting of three copper conductors, each of which with a diameter of 1.3 mm - 1.5 mm is parallel to each other at a distance of 8-28 mm, is installed in bellows expansion joints (9), fixed shield supports (8) and in end elements (10), where one of the conductors is signal, the other is transit, and the third is “zero”. At the switching points (11), the signal and transit conductors of the cable (3) are connected to the signal and transit conductors of the pipeline (2), and the “zero” cable conductor is mounted on the housing of the bellows expansion joints (9), the fixed shield supports (8) and the end elements ( 10).

Figure 1 presents a diagram of a device for operational remote control of the humidification of the insulating layer of hot water heat pipes, where:

1. The pipeline.

2. A copper conductor-indicator of the pipeline (signal and transit, respectively).

3. The connection element in the form of a flat three-core copper cable in polymer insulation.

4. Place of transit.

5. Place of control.

6. The control unit.

7. Measuring instrument

Along the entire length of the pipeline (1), insulation conductors (signal and transit, respectively) (2), commuting in the places of transit (4) and control (5) with a flat three-core copper cable in polymer insulation (3) pass through the insulation foam (3). In the control place (5), a control unit (6) is installed, to which the measuring device (7) is connected.

Figure 2 presents a diagram of the element of the connection (3) in the form of a flat three-core copper cable, in polymer insulation for the system of operational remote control of the humidification of the insulating layer of hot water heat pipes, where:

three copper conductor conductors, for example d = l, 4 mm, are parallel to each other at a distance of, for example, 10 mm, depending on the desired wave impedance, and are coated with a single-layer polymer insulation. Figure 3 presents a diagram of a device for the on-line remote control of humidification of the heat-insulating layer of hot water heat pipes, including bellows expansion joints, fixed shield supports and end elements with a flat three-wire cable installed, where:

1. The pipeline.

2. A copper conductor-indicator of the pipeline (signal and transit, respectively).

3. The connection element in the form of a flat three-core copper cable in polymer insulation.

4. Place of transit.

5. Place of control.

6. The control unit.

7. The measuring device.

8. Fixed shield support.

9. Bellows expansion joint.

10. The end element of the pipeline.

11. The switching point.

Along the entire length of the pipeline (1), insulation conductors (signal and transit, respectively) (2) passing through the transit (4) and control (5) with a flat three-wire copper cable in polymer insulation, for example polyethylene (3) ) In the control place (5), a control unit (6) is installed, to which the measuring device (7) is connected. A flat cable (3) installed in a fixed shield support (8), a bellows expansion joint (9), an end element (10) is connected at the switching points (11) with a conductor - indicator of the pipeline (2).

If the distance between the three conductors is less than 6 mm or more than 28 mm, and the diameter of the conductor is less than 1.3 mm or more than 1.5 mm, then the possibility of taking clear reflectograms disappears, at the control and transit points, extraneous peaks appear that make it difficult Visibility ”of the pipeline, which leads to erroneous localization of the defect and makes the control system ineffective.

The principle of operation of the remote control system for humidification of the heat-insulating layer of a hot water pipeline based on a connecting element in the form of a flat cable (3) is to reflect the pulse between the pipeline (1) and the indicator wire (2) and to detect the inhomogeneity of the wave resistance of the indicator wires in the heat-insulating layer of pipelines . Heterogeneity occurs when the insulation is wet or the indicator conductors are broken. Even the slightest wetting of the thermal insulation leads to a sharp drop in resistance and requires an operative search for the wetting point. The commutation of the conductors of the connection element (3) in the control (5) and transit (4) places with the signal and transit pipe conductors (2) is made without matching devices, directly. Then the cable is led out to the control unit (6) where the operator connects the measuring device (7).

The inventive flat three-core cable for a remote control system allows you to accurately determine the point of humidification or breakage without the use of matching devices, which is not possible using a conventional coaxial cable. It is possible to take clear reflectograms without signal attenuation and unnecessary peaks at the control and transit points, which ensures good “visibility” of the pipeline and the ability to accurately localize the defect location.

At the same time, the claimed technical solution provides ease of installation and reliability of the system, and also significantly reduces economic costs when installing a remote control system for wetting the heat-insulating layer of heat pipes.

Claims (1)

A device for remote control of the wetting of the heat-insulating layer in hot water pipelines, consisting of two copper indicator conductors located in the heat-insulating layer of pipelines running along the entire length of the pipelines, bellows expansion joints and fixed shield supports, where one of the conductors is signal and the other is transit; as a means of connecting the indicator conductors at the monitoring and transit points, a connection element in polymer insulation was used, and in the places of transit the signal conductor of the pipelines is connected to the signal conductor of the subsequent pipeline, and the transit conductor is connected to the transit, and in the places of control the signal and transit conductors are through the connection element displayed in the control unit, characterized in that the connection element in the places of control and transit is made in the form of a flat three-core copper cable in a polymer from lyatsii containing three copper conductor, each having a diameter of 1.3-1.5 mm in parallel spaced apart at a distance of 6-28 mm, and is further set to bellows, the fixed shield supports and end members.