CN107860481B - Fixing method for wall temperature thermocouple wire sensor of conventional liquid engine - Google Patents
Fixing method for wall temperature thermocouple wire sensor of conventional liquid engine Download PDFInfo
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- CN107860481B CN107860481B CN201710971337.0A CN201710971337A CN107860481B CN 107860481 B CN107860481 B CN 107860481B CN 201710971337 A CN201710971337 A CN 201710971337A CN 107860481 B CN107860481 B CN 107860481B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/14—Supports; Fastening devices; Arrangements for mounting thermometers in particular locations
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
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- Testing Of Engines (AREA)
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Abstract
The invention belongs to the field of temperature measurement, and particularly relates to a method for fixing a wall temperature thermocouple wire sensor of a conventional liquid engine. The method comprises 1) installing a thermal insulation layer on the thermocouple wire sensor; the heat insulation layer comprises a plastic outer pipe and fireproof asbestos cloth; 2) the thermocouple wire sensor is fixed with the outer wall of the engine in a spot welding manner; 3) and the thermocouple wire sensor is glued to the outer wall of the engine by high-temperature glue. The method solves the problem that the existing wall temperature thermocouple wire sensor has high breaking probability in the test process.
Description
Technical Field
The invention belongs to the field of temperature measurement, and particularly relates to a method for fixing a wall temperature thermocouple wire sensor of a conventional liquid engine.
Background
In the test process of a conventional ground liquid rocket engine for more than 30 years, the wall temperature parameter acquisition environment is influenced by strong vibration, strong high temperature, a strong hot airflow field and the like.
In the traditional wall temperature parameter acquisition process, a wall temperature thermocouple wire sensor is spot-welded on an engine, and the phenomenon of falling and disconnection of part or even most of the thermocouple wire sensor often occurs after the thermocouple wire sensor is used for a period of time. With the task requirements of conventional engines on development, shaping, sampling inspection and product delivery, the requirement of a design department on accurate measurement of the wall temperature parameter of the temperature of the outer surface of the engine in the whole process is higher and higher, and particularly, the wall temperature outside a thrust chamber is very important for analysis of heat transfer and measurement of the wall temperature on an evaporator, a cooler and a booster pipe in the process of flying a carrier rocket of a booster system of the engine.
According to incomplete statistics of wall temperature parameter data measured in recent 20 years, the disconnection phenomenon of the thermocouple wire sensor is between 20% and 85%, and the technical problem can not be completely solved even though various people continuously try to grope tests in the period. Therefore, how to research a sufficiently reliable wall temperature thermocouple wire sensor fixing method under the severe environment condition is an urgent problem to be solved in the field of conventional ground engine test temperature parameter measurement.
Disclosure of Invention
In order to solve the problems in the background art, the invention provides a method for fixing a wall temperature thermocouple wire sensor in a conventional engine test, and solves the problem that the existing wall temperature thermocouple wire sensor has high breaking probability in the test process.
The specific technical scheme of the invention is as follows:
the invention provides a method for fixing a conventional liquid engine wall thermocouple wire sensor, which comprises the following steps:
1) the thermocouple wire sensor is provided with a heat insulation layer; the heat insulation layer comprises a plastic outer pipe and fireproof asbestos cloth;
2) the thermocouple wire sensor is fixed with the outer wall of the engine in a spot welding manner;
3) and the thermocouple wire sensor is glued to the outer wall of the engine by high-temperature glue.
Further, the step 2) is specifically:
2.1) carrying out spot welding on the tail ends of two thermocouple wires in the thermocouple wire sensor;
2.2) kneading the tail end of the thermocouple wire sensor after spot welding to form a spherical welding spot or a pie-shaped welding spot;
2.3) polishing the welding spot and the surface of the outer wall of the engine by using sand paper;
2.4) cleaning the welding spot and the outer wall of the engine by using an alcohol cotton ball;
2.5) adopting an electric welding machine based on the capacitance charge-discharge principle to perform spot welding on the welding spot and the outer wall of the engine.
Further, the step 1) specifically comprises:
1.1) sleeving an insulating sleeve on two thermocouple wires;
1.2) winding the fireproof asbestos cloth on the insulating sleeve.
Further, the step 3) is specifically:
3.1) coating a proper amount of high-temperature glue on a welding point where the thermocouple wire sensor is welded with the outer wall of the engine;
and 3.2) fixing the thermocouple wire sensor and the part of the outer wall of the engine, which is coated with the high-temperature adhesive, by using the adhesive tape, and removing the adhesive tape after the high-temperature adhesive is cured.
In addition, in order to further fix the thermocouple wire sensor, the invention also comprises a step 4) of auxiliary fixation; the method comprises the following steps: the method comprises the following steps of (1) carrying out auxiliary bonding and fixing on the part of the thermocouple wire sensor, which is not fixed on the outer wall of the engine, by using an adhesive tape; the auxiliary bonding and fixing point is a low-temperature part, and the melting point of the low-temperature part is smaller than that of the adhesive tape.
In particular, the high-temperature glue is HT767A type, and the high-temperature resistance capability is more than 1000 ℃.
Specifically, two thermocouple wires in the thermocouple wire sensor are made of different materials, one thermocouple wire is made of nickel-chromium-constantan, and the other thermocouple wire is made of nickel-chromium-nickel-silicon; the diameters of the two thermocouple wires are both 0.3 mm; the length of the thermocouple wire is 1 m.
Specifically, the winding length of the fireproof asbestos cloth on the insulating sleeve is 50-80 mm, and the starting point of the winding is the welding point of the thermocouple wire.
Specifically, the insulating sleeve is made of high-temperature-resistant polytetrafluoroethylene; its high-temp resistance is greater than 1000 deg.C.
The invention has the advantages that:
1. the method fixes the thermocouple wire sensor on the outer wall of the engine by adopting a mode of joint action of welding and high-temperature glue bonding of an electric welding machine based on a capacitance charging and discharging principle, so that the wall temperature thermocouple wire sensor of the engine is more convenient and quicker in the installation process, the reliability degree is higher than that of the original process method, and the falling rate of the wall temperature thermocouple wire sensor of the engine in the test process is lower.
2. In the welding process, the two thermocouple wires are firstly subjected to spot welding, and then the welding area is increased through the spherical welding spots and the cake-shaped welding spots, so that the welding reliability is further improved.
3. According to the method, the thermocouple wires are sleeved with the insulating sleeves and the fireproof asbestos cloth, the insulating sleeves are adopted to realize insulation, and the fireproof asbestos cloth is adopted to avoid the insulation problem caused by high-temperature burning through of the insulating sleeves.
4. The fixing method of the invention realizes a new method for measuring the temperature in the conventional liquid engine test, and provides complete, accurate and reliable data for correctly analyzing and mastering whether each working system of the engine is normal or not, analyzing the strength of the clamp connecting piece by the shell temperature and selecting and rechecking materials.
5. The thermocouple wire sensor is bonded and fixed with the fixed part of the outer wall of the engine in an auxiliary manner by the adhesive tape, so that the thermocouple wire sensor is bonded more firmly.
Detailed Description
The invention provides a method for fixing a conventional liquid engine wall thermocouple wire sensor, which comprises the following parts in the specific implementation process:
selection of heat-resistant high-temperature glue
The auxiliary bonding method of the heat-resistant high-temperature glue is a technological method that the heat-resistant high-temperature glue is adopted to perform auxiliary bonding and firmness on the basis of the end face of the thermocouple wire welded at the original point and at the tail part of the lead, so that the technical problem that the wall temperature thermocouple wire sensor is broken due to the swinging and pulling of strong vibration of a test can be solved. The concrete measures are as follows:
screening high-temperature-resistant glue (more than or equal to 1000 ℃) with good insulating property and firm bonding strength;
various materials to be adhered such as stainless steel, carbon steel, aluminum and the like, thermocouple wires, fireproof asbestos cloth, high-temperature-resistant fluorine-containing four-insulation sleeves, metal and the like are selected to carry out auxiliary adhesion verification tests of various types of high-temperature adhesives; and (3) carrying out simulation heating, burning, baking and pulling tests on a test product adhered with the high-temperature adhesive, and testing the adhesive strength of the high-temperature adhesive.
Secondly, a wall temperature thermocouple wire sensor spot welding and gluing fixing method;
because the end point area of the thermocouple wire subjected to spot welding is only 0.3, the thermocouple wire not only bears the measurement task of the wall temperature, but also bears the anti-pulling and anti-swinging fixing effect of a lead wire with the length of about 1 meter under strong vibration and strong high-temperature airflow, and the fixing of the thermocouple wire solves the problem, particularly:
step 1) installing a thermal insulation layer on a thermocouple wire sensor; the heat insulation layer comprises a plastic outer pipe and fireproof asbestos cloth;
step 1.1) firstly sleeving an insulating sleeve on two thermocouple wires;
and step 1.2) winding the fireproof asbestos cloth on the insulating sleeve.
Step 2), spot welding and fixing the thermocouple wire sensor and the outer wall of the engine;
step 2.1), performing spot welding on the tail ends of two thermocouple wires in the thermocouple wire sensor;
step 2.2) kneading the tail end of the thermocouple wire sensor after spot welding to form a spherical welding spot or a cake-shaped welding spot;
step 2.3) polishing the welding spot and the surface of the outer wall of the engine by using sand paper;
step 2.4) cleaning the welding spot and the outer wall of the engine by using an alcohol cotton ball;
and 2.5) carrying out spot welding on the welding spot and the outer wall of the engine by adopting an electric welding machine based on a capacitance charge-discharge principle.
Step 3) adopting high-temperature glue to glue the thermocouple wire sensor with the outer wall of the engine;
step 3.1) coating a proper amount of high-temperature glue on a welding point where the thermocouple wire sensor and the outer wall of the engine are welded;
and 3.2) fixing the thermocouple wire sensor and the part of the outer wall of the engine coated with the high-temperature adhesive by using the adhesive tape, and removing the adhesive tape after the high-temperature adhesive is cured.
Step 4), auxiliary fixing;
the method comprises the following steps of (1) carrying out auxiliary bonding and fixing on the part of the thermocouple wire sensor, which is not fixed on the outer wall of the engine, by using an adhesive tape; the auxiliary bonding and fixing point is a low-temperature part, and the melting point of the low-temperature part is smaller than that of the adhesive tape.
Checking of measuring points
The check of the measuring point is that repeated polarity check is carried out on a plug at the other end of the wall temperature thermocouple wire sensor to be adhered by spot welding, so that the correctness is ensured; then, the part of the spot-welded bonding surface is subjected to abrasive paper grinding and surface cleaning treatment; after the electric welding is finished, the inspection system of the main post and the auxiliary post is implemented for the thermocouple wire sensor of the measuring point of the spot-welded and stuck part. The thermocouple wire sensor is firmly fixed and is not easy to fall off.
The implementation effect is as follows: when the method is used for fixing the engine wall temperature thermocouple wire sensor, the shedding rate of the thermocouple wire sensor is reduced to a good state without disconnection from 20-85% in the test process of the past decades when the engine is tested, so that the accurate measurement of all wall temperature parameters of the engine in the whole process is obtained.
Claims (5)
1. A method for fixing a wall temperature thermocouple wire sensor of a conventional liquid engine is characterized by comprising the following steps:
1) the thermocouple wire sensor is provided with a heat insulation layer; the heat insulation layer comprises a plastic outer pipe and fireproof asbestos cloth;
1.1) sleeving an insulating sleeve on two thermocouple wires;
1.2) winding the fireproof asbestos cloth on the insulating sleeve;
2) the thermocouple wire sensor is fixed with the outer wall of the engine in a spot welding manner;
2.1) carrying out spot welding on the tail ends of two thermocouple wires in the thermocouple wire sensor;
2.2) kneading the tail end of the thermocouple wire sensor after spot welding to form a spherical welding spot or a pie-shaped welding spot;
2.3) polishing the welding spot and the surface of the outer wall of the engine by using sand paper;
2.4) cleaning the welding spot and the outer wall of the engine by using an alcohol cotton ball;
2.5) carrying out spot welding on a welding spot and the outer wall of the engine by adopting an electric welding machine based on a capacitance charge-discharge principle;
3) adopting high-temperature glue to glue the thermocouple wire sensor with the outer wall of the engine;
3.1) coating a proper amount of high-temperature glue on a welding point where the thermocouple wire sensor is welded with the outer wall of the engine;
3.2) fixing the thermocouple wire sensor and the part of the outer wall of the engine coated with the high-temperature adhesive by using an adhesive tape, and removing the adhesive tape after the high-temperature adhesive is cured;
4) auxiliary fixing;
the thermocouple wire sensor is subjected to auxiliary bonding and fixing on the fixed part of the outer wall of the engine by using an adhesive tape; the auxiliary bonding and fixing point is a low-temperature part, and the melting point of the low-temperature part is smaller than that of the adhesive tape.
2. The method for fixing a conventional liquid engine wall thermocouple wire sensor according to claim 1, wherein: the high-temperature adhesive is HT767A type, and the high-temperature resistance is more than 1000 ℃.
3. The method for fixing a conventional liquid engine wall thermocouple wire sensor according to claim 2, wherein: two thermocouple wires in the thermocouple wire sensor are made of different materials, one thermocouple wire is made of nickel-chromium-constantan, and the other thermocouple wire is made of nickel-chromium-nickel-silicon; the diameters of the two thermocouple wires are both 0.3 mm; the length of the thermocouple wire is 1 m.
4. The method for fixing a conventional liquid engine wall thermocouple wire sensor according to claim 3, wherein: the winding length of the fireproof asbestos cloth on the insulating sleeve is 50-80 mm, and the winding starting point is a welding point of the thermocouple wire.
5. The method for fixing a conventional liquid engine wall thermocouple wire sensor according to claim 4, wherein: the insulating sleeve is made of high-temperature-resistant polytetrafluoroethylene plastic; its high-temp resistance is greater than 1000 deg.C.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106134439B (en) * | 2010-12-10 | 2014-03-19 | 上海空间推进研究所 | Thrust chamber is high temperature resistant temperature measuring equipment and temp measuring method thereof |
| CN204214562U (en) * | 2014-09-17 | 2015-03-18 | 中国航天科技集团公司第四研究院第四十一研究所 | For the temperature measuring equipment of solid propellant rocket |
| CN204988529U (en) * | 2015-03-30 | 2016-01-20 | 久茂自动化(大连)有限公司 | Pottery trade temperature measuring device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5999784A (en) * | 1982-11-29 | 1984-06-08 | Sanyo Electric Co Ltd | Thermoelectric element |
| JP3456112B2 (en) * | 1997-06-06 | 2003-10-14 | オムロン株式会社 | Soldering iron temperature measuring method and soldering device |
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- 2017-10-18 CN CN201710971337.0A patent/CN107860481B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106134439B (en) * | 2010-12-10 | 2014-03-19 | 上海空间推进研究所 | Thrust chamber is high temperature resistant temperature measuring equipment and temp measuring method thereof |
| CN204214562U (en) * | 2014-09-17 | 2015-03-18 | 中国航天科技集团公司第四研究院第四十一研究所 | For the temperature measuring equipment of solid propellant rocket |
| CN204988529U (en) * | 2015-03-30 | 2016-01-20 | 久茂自动化(大连)有限公司 | Pottery trade temperature measuring device |
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