RU2467295C1 - Device to diagnose condition of flange protective cartridge of thermoelement - Google Patents

Abstract

FIELD: measurement equipment.

SUBSTANCE: invention relates to measurement equipment and may be used, in particular, in thermometry, especially in transient processes, and where it is possible to quickly react to possible unsealing of protective cartridges of thermoelements by means of pressure measurement. The device for diagnostics of condition of a flange protective cartridge of a thermoelement, comprising a reference pressure unit, joined through a control channel with a thermoelement, made of a metering probe in a protective case with a seating flange, providing for tight connection of the metering probe in the protective case with a process plant, besides, the control channel is arranged in the form of an intermediate tight cavity formed between the working medium and the surrounding space, at the same time the seating flange is arranged as composite - from power and contact flanges, and the intermediate tight cavity is formed by serially communicating narrow through hole in a power flange, a part of the inner cylindrial surface of a sealing gasket between flanges, a horizontal narrow slot selected in the power flange and limited with the plane of the contact flange, a circular face on the central hole of the power flange, a gap between the cylindrical surface of the same hole and a flat on the seating surface of the protective case in the upper part of the contact flange, and also the narrow circular gap between the metering probe, its sealing ring and protective case.

EFFECT: simplified design and reduction of its dimensions with reduction of time for detection of protective cartridge faults.

3 cl, 2 dwg

Description

The invention relates to measuring equipment and can be used, in particular, in thermometry, especially in fast-flowing technological processes, and where it is possible to quickly respond to possible depressurization of thermowells of thermocouples by measuring pressure.

In patent sources, analogues for monitoring the integrity of the thermowell of the thermocouple could not be identified.

Known control of the integrity of the pipeline in the device to prevent the catastrophic development of an emergency, described in the patent of the Russian Federation No. 2317464 in class. F16K 17/38, F17D 3/00, 5/00, c. 02.28.06, op.20.09.07.

A well-known means of monitoring the integrity of the main pipeline includes pressure sensors of the medium pumped through the pipeline, a signal transmission line from the pressure sensors to the control center of the main pipeline, a command transmission line for actuating the locking elements, an emergency recognition and detection system for each section, executed by type and in the form of burglar alarms based on monitoring the integrity of the watchdog circuit between the shutoff valves. The pressure drop in the pumped medium is a signal of violation of the integrity of the pipeline.

The system is quite complex and is used for pipelines.

Known temperature measuring device with a unit for monitoring the leakage of the working material into the environment by measuring pressure, described in the materials of the company CatTracker (see website www.cattracker.ru/index.php?page=cattracker "Multi-zone flexible thermocouples, characteristics, design: CatTrack ... ", 2009-2011

The known device contains a measuring probe of the thermocouple in a protective sleeve with a flange that provides a mechanical tight connection with the technological installation, a pressure monitoring unit in the form of a leak detection unit, including a wedge gate valve, a drain valve, a tee, a pressure gauge, pipes, and an auxiliary protective chamber to prevent leakage , which is an intermediate sealed cavity located between the shell of the immersion of the thermocouple and the environment, and t Also a junction box for switchgear and jumper cables and mechanically connected to them on both sides and also connected to a leak detection unit.

A disadvantage of the known device is the complexity of the design of the node, due to the presence of a volumetric (bulky) special intermediate cavity, leading to an increase in the time for detecting leaks in the protective sleeve and increasing the length of the measuring probe.

The objective is to simplify the design and reduce its dimensions while reducing the time to detect a malfunction of the thermowell.

The problem is solved in that in the device for diagnosing the condition of the flange thermowell of the thermocouple, including the pressure control unit connected through the control channel to the thermocouple, consisting of a measuring probe in the thermowell with a mounting flange, which provides a tight connection of the measuring probe in the thermowell with the technological unit, the control channel is made in the form of an intermediate sealed cavity formed between the working medium and the surrounding space, with According to the invention, the landing flange is made integral of the power and contact flanges, and the intermediate sealed cavity is formed by successively communicating with each other by a narrow through hole in the power flange, part of the inner cylindrical surface of the gasket between the flanges, a horizontal narrow groove selected in the power flange bounded by the plane of the contact flange , an annular chamfer on the central hole of the power flange, a gap between the cylindrical surface of the same hole and yskoy on the seat surface of the protective sleeve in the upper portion of the contact flange, and a narrow annular gap between the measuring probe and its sealing ring and the protective sleeve.

In this case, the control channel can be connected to the control pressure unit through a fitting on the power flange or through a socket in it.

The implementation of the mounting flange composite - from the power and contact flanges in conjunction with obtaining an intermediate tight cavity of the control channel from the gaps and holes between the structural elements of the thermal converter, as described above, allows to simplify the design of the device, reduce its dimensions and reduce the time of detection of malfunctions.

The technical result is a simplification of the design while reducing the volume of the intermediate sealed cavity, which reduces the response time to a possible malfunction of the thermowell and reduces the dimensions of the structure.

The inventive device has a novelty in comparison with the prototype, differing from it by such significant features as the construction of the mounting flange composite of power and contact flanges, and the implementation of the control channel in the design of the thermocouple by forming an intermediate sealed cavity from successively communicating with each other through a narrow through hole in the power a flange, a groove selected in it, bounded by the plane of the contact flange, an annular chamfer on the central hole of the power flange, The gap between the cylindrical surface of the same hole and the flat on the pipe seating surface in the upper part of the contact flange, as well as the narrow annular gap between the measuring probe, its sealing ring and the protective sleeve, together provide the desired result.

The applicant is not aware of technical solutions that have the indicated distinguishing features, which together ensure the achievement of a given result, therefore, he believes that the claimed device meets the criterion of "inventive step".

The inventive device can be widely used in measuring technology, and therefore meets the criterion of "industrial applicability".

The invention is illustrated by drawings, where shown in:

- figure 1 - sectional view of the device;

- figure 2 is an enlarged view of a portion of the control channel.

The device for diagnosing the condition of the flange thermowell of the thermocouple (Fig. 1) includes a pressure control unit 1 connected to the thermocouple 2, consisting of a measuring probe 3 in the protective sleeve 4 and the mounting flange 5, which provides a tight connection of the measuring probe in the protective sleeve with the technological unit. The control unit 1 communicates with the control channel 6 formed by holes and gaps in the design of the nodes of the thermal converter 2. The landing flange 5 is made integral - from the power and contact flanges 7 and 8. The control channel 6 in the form of an intermediate sealed cavity is formed by a narrow, through hole 9 in the power flange 7, the groove 10 selected therein, bounded by the plane of the contact flange 8 and the inner surface 11 of the gasket between the flanges, an annular chamfer 12 on the central opening uu 13 force the flange 7, a gap 14 between the cylindrical surface of the same hole and flattened 15 on the seat surface of the protective tube 3 in the upper portion of the contact of the flange 8, and a narrow annular gap 16 between the measurement probe 3, its sealing ring 18 and the protective sleeve 4.

The intermediate tight cavity 6 is connected with the pressure control unit 1, in particular, through the fitting 17 on the power flange 7.

The device operates as follows.

If the integrity of the protective sleeve 4 of the thermocouple 2 is violated, the pressure P of the working medium is transferred from the narrow annular gap 16 between the measuring probe 3, its sealing ring 18 and the protective sleeve 4 of the contact flange 8, through the gap between the cylindrical surface of the central hole of the power flange 7 and the flat 15 on the landing the cylindrical surface of the protective sleeve 4 in the upper part of the contact flange 8, through the gap 19 between the chamfer 12 on the Central hole of the power flange and the landing cylindrical surface 3 shield sleeve 4, a horizontal groove 10 between the power and contact flanges 7 and 8, a narrow through hole 9 in the power flange 7 and through the fitting 17 to the pressure monitoring unit 1, where it is measured (possibly just detected) and indicated (possibly just signaled) . The operator detects the readings of node 1 and quickly makes a decision on the process and the replacement of the thermowell 4.

In comparison with the prototype of the inventive device for diagnosing the condition of the flange thermowell of the thermocouple is simpler in design and has a reduced size while reducing the time to detect a malfunction of the thermowell.

Claims (3)

1. A device for diagnosing the condition of the flange thermowell of the thermocouple, including a pressure monitoring unit connected through a control channel to a thermocouple consisting of a measuring probe in a thermowell with a mounting flange, providing a tight connection of the measuring probe in the thermowell with the process unit, while the monitoring channel is made in the form of an intermediate sealed cavity formed between the working medium and the surrounding space, characterized in that the landing flange made of composite - from the power and contact flanges, and the intermediate sealed cavity is formed by a narrow through hole in the power flange sequentially communicating with each other, part of the inner cylindrical surface of the gasket between the flanges, a horizontal narrow groove selected in the power flange bounded by the contact flange plane, an annular chamfer on the central hole of the power flange, the gap between the cylindrical surface of the same hole and the flat on the landing surface of the shield hydrochloric sleeve in the upper portion of the contact flange, and a narrow annular gap between the measuring probe and its sealing ring and the protective sleeve. 2. The device according to claim 1, characterized in that the control channel is connected to the control pressure unit through a fitting on the power flange. 3. The device according to claim 1, characterized in that the control channel is connected to the control pressure unit through a socket in the power flange.

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