CN214173590U

CN214173590U - Mobile scanning type uncooled high-temperature thermocouple

Info

Publication number: CN214173590U
Application number: CN202120366332.7U
Authority: CN
Inventors: 浦钧森; 郝陶雪
Original assignee: Harbin Dejie Electronic Technology Co ltd
Current assignee: Harbin Dejie Electronic Technology Co ltd
Priority date: 2021-02-10
Filing date: 2021-02-10
Publication date: 2021-09-10
Anticipated expiration: 2031-02-10

Abstract

A mobile scanning type non-cooling high-temperature thermocouple belongs to the field of temperature measurement; the high-temperature protection pipe is sleeved at the lower end of the movable sleeve and fixed through a positioning pin, the insulating ceramic pipe is sleeved on the thermocouple wire and penetrates into the high-temperature protection pipe, a thermocouple wire measuring point extends out of the high-temperature protection pipe and is fixed through high-temperature glue, the other end of the thermocouple wire is connected with a high-temperature and high-pressure resistant sealing aviation plug fixedly mounted at the upper end of the movable sleeve, the movable sleeve is movably sleeved in the fixed sleeve, a driving motor is fixedly mounted on a motor flange at the upper part of the movable sleeve, the input end of the driving motor is connected with a controller, the output end of a lead screw of the driving motor is in threaded connection with a fixed flange fixedly mounted at the upper end of the fixed sleeve, a sealing ring is mounted in the upper end of the fixed sleeve, and a locking nut is sleeved at the lower end of the fixed sleeve; the thermocouple does not need air cooling or water cooling, the position of a measuring point can be adjusted in the using process, and a single thermocouple wire measuring point is used for measuring and taking values of any position in a pipeline, so that the using cost is reduced, and the measuring precision is improved.

Description

Mobile scanning type uncooled high-temperature thermocouple

Technical Field

The invention relates to a high-temperature thermocouple, and belongs to the field of temperature sensors.

Background

In recent years, with the development of industrial modernization, gas turbines are increasingly widely applied in the fields of ship propulsion, petrochemical industry, aerospace and the like, a combustion chamber is used as one of three major components of the gas turbine, the comprehensive performance of the combustion chamber directly influences the use efficiency of the gas turbine, and meanwhile, various laboratories and enterprises develop various test platforms through comprehensive utilization of the combustion chamber, and the most important performance indexes in the performance of the combustion chamber are the average outlet temperature and the uniformity of temperature distribution.

When the outlet temperature of the combustion chamber is measured, a multipoint thermocouple is usually adopted to measure the outlet temperature of the combustion chamber, namely N small holes are formed in a heat-insulating protection pipe inserted into a pipeline, a thermocouple wire is inserted into each small hole and used for measuring the outlet temperature at the position of the small hole in the radial direction, and the method can only measure the temperature at a fixed position; the thermocouple needs to be simultaneously loaded with N thermocouple wires, so that the thermocouple can be completely loaded only by using a thick high-temperature protection tube, the thicker the diameter of the high-temperature protection tube is, the higher the heat capacity of the thermocouple is, the slower the thermal response speed is, the measurement precision is influenced, and the real state of the outlet of a combustion chamber cannot be accurately reflected; if one thermocouple wire fails or is disconnected, the thermocouple cannot measure complete data and can only be scrapped, so that the use cost is increased, and the use risk is increased; the conventional thermocouple can be cooled in an air cooling or water cooling mode, the service life of the thermocouple is prolonged, but due to the introduction of air and cold water, the measurement data of the thermocouple is low and unstable, the real state of the outlet of the combustion chamber cannot be accurately reflected, and the measurement error is increased.

Disclosure of Invention

The invention aims to solve the problems in the prior art, and provides a mobile scanning type uncooled high-temperature thermocouple, so that the purposes of reducing the use cost, improving the measurement precision and prolonging the service life are achieved.

The invention has the basic design that a high-temperature protection pipe is sleeved at the lower end of a movable sleeve and fixed by a positioning pin, an insulating ceramic pipe is sleeved on a thermocouple wire, the thermocouple wire penetrates into the high-temperature protection pipe, a thermocouple wire measuring point extends out of the high-temperature protection pipe, the thermocouple wire is fixed on the high-temperature protection pipe by high-temperature glue, the other end of the thermocouple wire is connected with a high-temperature and high-pressure resistant sealing aviation plug, the high-temperature and high-pressure resistant sealing aviation plug is fixedly connected at the upper end of the movable sleeve, the movable sleeve is movably sleeved in the fixed sleeve, a motor flange is fixedly arranged at the middle upper part of the movable sleeve, a driving motor is fixedly arranged on the motor flange, the input end of the driving motor is connected with a controller, the output end of a lead screw of the driving motor is in threaded connection with a fixed flange fixedly arranged at the upper end of the fixed sleeve, a sealing ring is arranged inside the upper end of the fixed sleeve, and a locking nut is sleeved at the lower end of the fixed sleeve, thus, the mobile scanning type uncooled high-temperature thermocouple is formed.

The invention adopts a single-point mobile scanning method to measure, a hole is formed at the tail end of a high-temperature protection tube with a thermocouple extending into a pipeline, a thermocouple wire is inserted into the high-temperature protection tube, and a measuring point at the tail end of the thermocouple wire extends out of the hole and is fixed by high-temperature glue. When the thermocouple measuring device is used, the thermocouple is fixed on a pipeline to be measured through the locking nut, the position to be measured is set, the controller controls the driving motor to act, the output screw rod of the driving motor adjusts the movable sleeve and the high-temperature protection tube to move up and down in the fixed sleeve, namely, a measuring point of the thermocouple wire can move up and down in the pipeline to be measured in the radial direction, and then the measuring data of any position in the radial direction of the pipeline can be obtained. Compared with the defect that a multipoint thermocouple can only measure fixed position and fixed amount of measurement data, the thermocouple can measure data at any position, and the measurement accuracy of the average temperature of the outlet and the accuracy of the uniformity of the temperature distribution are improved.

The invention only needs to install one thermocouple wire, reduces the use cost, simultaneously enables the outer diameter of the protection tube to be thinner, has less heat capacity, can greatly improve the response time and improves the measurement precision.

When the thermocouple wire is in failure or disconnected, the multipoint type thermocouple wire can only be scrapped, the thermocouple wire can be reused only by replacing the high-temperature protection tube and the thermocouple wire, and the use risk and the maintenance cost are further reduced.

The invention lengthens the whole length of the thermocouple, and the temperature of the tail end of the thermocouple is reduced to be within the tolerance temperature of the connecting piece, so that a water cooling or air cooling device is not needed, the measurement precision is improved, and the use cost is reduced.

Drawings

FIG. 1 is a cross-sectional view of a mobile scanning uncooled high temperature thermocouple;

FIG. 2 is an enlarged view of a portion of FIG. 1;

FIG. 3 is a top view of FIG. 1;

description of part numbers in the figures: 1. the high-temperature and high-pressure resistant aviation plug comprises a controller, 2, a driving motor, 3, a high-temperature and high-pressure resistant sealing aviation plug body, 4, a movable sleeve, 5, an insulating ceramic tube, 6, a sealing ring, 7, a fixed sleeve, 8, a high-temperature protection tube, 9, high-temperature glue, 10, a thermocouple wire, 11, a positioning pin, 12, a locking nut, 13 fixing flanges, 14 and a motor flange.

Detailed Description

The invention is described in detail with reference to the accompanying drawings, in which, a mobile scanning uncooled high temperature thermocouple, a high temperature protection tube 8 is sleeved on the lower end of a mobile sleeve 4 and fixed by a positioning pin 11, an insulating ceramic tube 5 is sleeved on a thermocouple wire 10, the thermocouple wire 10 penetrates into the high temperature protection tube 8, a thermocouple wire measuring point extends out of the high temperature protection tube 8, the thermocouple wire 10 is fixed on the high temperature protection tube 8 by a high temperature glue 9, the other end of the thermocouple wire 10 is connected with a high temperature and high pressure resistant sealed aviation plug 3, the high temperature and high pressure resistant sealed aviation plug 3 is fixedly connected on the upper end of the mobile sleeve 4, the mobile sleeve 4 is movably sleeved in a fixed sleeve 7, a motor flange 14 is fixedly arranged on the middle upper part of the mobile sleeve 4, a driving motor 2 is fixedly arranged on the motor flange 14, the input end of the driving motor 2 is connected with a controller 1, the output end of a lead screw of the driving motor 2 is in threaded connection with a fixed flange 13 fixedly arranged on the upper end of the fixed sleeve 7, the inner part of the upper end of the fixed sleeve 7 is provided with a sealing ring 6, and the lower end is sleeved with a locking nut 12.

When in use, the thermocouple is fixed on the measuring pipeline through the locking nut 12, the controller 1 outputs signals to control the screw rod of the driving motor 2 fixedly arranged on the motor flange 14 to rotate, the screw rod is in threaded connection with the fixed flange 13, under the drive of the screw rod, the movable sleeve 4 drives the high-temperature protection tube 8 to move up and down in the fixed sleeve 7 through the positioning pin 11, the sealing ring 6 on the fixed sleeve 7 can prevent high-temperature gas from leaking, the thermocouple wire 10 sleeved with the insulating ceramic tube 5 is fixed on the high-temperature protection tube 8 through the high-temperature glue 9, the thermocouple wire measuring point carries out data measurement on any point of the radial position in the measuring pipeline along with the up and down movement of the high-temperature protection tube 8, then is connected with a communication cable through a high-temperature and high-pressure resistant sealing aviation plug 3 to output a measuring signal, and the measurement accuracy of the average outlet temperature and the accuracy of the uniformity of temperature distribution are improved by calculating a plurality of groups of data.

When the thermocouple wire 10 fails or breaks and cannot output measurement data, the thermocouple wire 10 can be reused only by replacing the high-temperature protection tube 8 fixedly provided with the thermocouple wire 10, and the use cost and the maintenance cost are reduced.

Claims

1. A mobile scanning type uncooled high-temperature thermocouple is characterized in that: the high-temperature protection pipe (8) is sleeved at the lower end of the movable sleeve (4) and fixed through a positioning pin (11), the insulating ceramic pipe (5) is sleeved on a thermocouple wire (10), the thermocouple wire (10) penetrates into the high-temperature protection pipe (8), a thermocouple wire measuring point extends out of the high-temperature protection pipe (8), the thermocouple wire (10) is fixed on the high-temperature protection pipe (8) through high-temperature glue (9), the other end of the thermocouple wire (10) is connected with the high-temperature and high-pressure resistant sealing aviation plug (3), the high-temperature and high-pressure resistant sealing aviation plug (3) is fixedly connected to the upper end of the movable sleeve (4), the movable sleeve (4) is movably sleeved in the fixed sleeve (7), a motor flange (14) is fixedly installed at the middle upper part of the movable sleeve (4), a driving motor (2) is fixedly installed on the motor flange (14), and the input end of the driving motor (2) is connected with the controller (1), the screw output end of the driving motor (2) is in threaded connection with a fixed flange (13) fixedly arranged at the upper end of a fixed sleeve (7), a sealing ring (6) is arranged inside the upper end of the fixed sleeve (7), and a locking nut (12) is sleeved at the lower end of the fixed sleeve.