JPH045527A - Temperature sensor and temperature measuring element - Google Patents

Abstract

PURPOSE:To quicken the response and to obtain high temperature resistance by bringing a temperature measuring element into direct contact with a measurement medium, stopping the instruction of the high-voltage measurement medium by an MI cable part, and holding the outward flange of the temperature measuring element there between and fixing it by welding. CONSTITUTION:The temperature measuring element 5 winding a temperature measuring platinum element wire around the tip-side cylindrical outer peripheral surface of a ceramic rod body 2 which has the outward flange 1 on the base end side and embedding and coupling the MI cable 4 as a lead wire on the base end side in a projection shape is used. The element wire 3 is coated with a coating material 17. The tip side and base end side are held in equal pressure by providing a communication hole 18 in the center part. The temperature measuring element 5 is inserted into the loading hole 7 of a fitting screw 6 and the outward flange 1 is fitted with its stepping part 8 to fit the base end side and a protective cylinder 10 where an intake hole 9 is bored is fitted on the side wall from the tip end side to make the base-end side end surface abut on the flange 1 and the peripheral wall is fixed to the tip of the fitting screw 6 by laser welding 11.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a temperature sensor and a temperature measuring element. In particular, the present invention provides a rapid response temperature sensor, a temperature measuring element of a resistance temperature detector, and a liquid oxygen
This invention relates to a temperature sensor for liquid hydrogen.

[Problems to be solved by the prior art and the invention] Temperature sensors for rockets can instantly detect the changing state of the combustion state of the rocket, which changes from moment to moment.
First and foremost, the ability to respond quickly is required. Furthermore, at high temperatures of around 900°C, 380 kg/cI
It is used under high pressure of about 11" and in places with strong vibrations and shocks.In order to improve responsiveness, it is possible to reduce the heat capacity and make it thinner, but the temperature sensor is also sensitive to shocks. In order to improve responsiveness, it must be made thin and thin, but to improve impact resistance, it must be strong, and it must meet contradictory requirements.

When using a temperature sensor under high pressure, the electrical signal of the temperature sensor is extracted, so there is a risk that high-pressure fluid may flow out from the extraction part.At room temperature, it is easy to create an airtight structure with an O-ring, but at high temperatures, airtightness may not be possible. Hateful.

Temperature sensors for rockets have good response and are used under the most severe conditions, requiring high pressure resistance, shock resistance, vibration resistance, and high temperature resistance.

Rocket fuel has a pressure of about 10kg/C11l,
Liquid oxygen at ~183°C or liquid hydrogen at -253°C is used.

By the way, conventionally, as shown in FIG. 6, the connection part between the temperature measuring element 1101 and the lead wire 1102 is covered with a stainless steel cylinder 1103, one end is fixed by spot welding, and an epoxy resin 1104 etc. is applied from the opening on the other end. The original filling is being used. If organic matter or oil adheres to this temperature measuring element, it will ignite, and liquid oxygen in particular often ignites due to the compatibility of oxygen. ``Means for solving the problem'' Conventional temperature sensors have no temperature measuring element at all. Although it is completely covered and protected by a protective tube, in order to improve responsiveness, the temperature measuring element is exposed so as to come into direct contact with the combustion gas measurement medium of liquid oxygen or liquid hydrogen. For use under high pressure, MI cables are used as lead wires, and the locations where the MI cables are inserted are filled with wax and sealed, and the end faces of the MI cables are also pressure-tightly sealed. Since the outward flange of the temperature measuring element is sandwiched between the mounting screw and the protective tube and fixed by welding, it can withstand use even when subjected to shocks and vibrations. To withstand high temperatures, a ceramic rod temperature sensing element is used.

In addition, in view of the above circumstances, the present invention provides a connection between a temperature measuring element and a lead wire in order to prevent a temperature sensor immersed in liquid oxygen or liquid hydrogen in a rocket fuel tank from catching fire or being destroyed at extremely low temperatures. 4-6 fluorinated resin.

"Function" The temperature measuring element comes into direct contact with the measurement medium, and the MI cable section serving as a lead wire prevents the high voltage measurement medium from entering.
The temperature measuring element is fixed by welding with its outward flange clamped.

Also, connect the connection part between the temperature measuring element and the lead wire to 4-67.
) coating, the temperature sensor will not catch fire in liquid oxygen or liquid hydrogen or be destroyed at extremely low temperatures.

"Example" A temperature-measuring platinum wire 3 is wound around the cylindrical outer peripheral surface of the distal end of a ceramic rod-shaped body 2 having an outward flange 1 on the proximal end shown in FIG. A temperature measuring element 5 embedded in the end side and connected in a protruding manner is used.

The temperature measuring platinum wire 3 is coated with a coating material 17. Although the coating material 17 is not transparent, the temperature-measuring platinum wire 3 and the like are shown as solid lines for easy understanding. In addition, there is a communication hole in the center to make the pressure equal between the distal end and the proximal end.
8.

As shown in FIG.
is inserted into the mounting hole 7, the outward flange 1 is engaged with the stepped portion 8, the proximal end is fitted, and the protective tube 10 with the introduction hole 9 bored in the peripheral wall from the distal end is fitted, and the proximal end is inserted into the mounting hole 7. The side end surface is brought into contact with the outward flange 1, and the peripheral wall is fixed to the tip of the mounting screw 6 by laser welding 11. Note that the MI cable 4 has a core wire 1 with an insulating powder 16 interposed within the metal sheath wire 15.
It accommodates 2. Ceramic cement is filled between the outward flange 1 and the mounting screw 6 to eliminate the gap and seal. To connect the temperature-measuring platinum wire 3 of the temperature-measuring element 5 and the core wire 12 of the MI cable 4, the core wire 12 is extended from the end face of the MI cable 4, passed through the inside of the rod-shaped body 2, and exposed near the outward flange 1 on the tip side. Then, the end 12a and the end 3a of the temperature-measuring platinum wire 3 are connected.

The MI cable 4 passes through the mounting screw 6 and protrudes,
The end face 13 of the MI cable 4 close to the connection part with the temperature measuring platinum wire 3 is sealed with a pressure-resistant seal 21, and the end face 14 on the other side is sealed with a moisture-proof seal 22, and the gap between the mounting screw 6 and the MI cable 4 is sealed. A solder 23 such as gold solder or gold-nickel-palladium solder is poured into and sealed. This protruding MI cable 4 is housed in the sleeve 31 and the cover plate 3
2 to close the opening of the sleeve 31 and connect the housing 33 with M.
The connection is made using an I cable 34, and the MI cable 4 is electrically connected to the connector 35.

The temperature measuring element 5 is positioned in a measurement medium such as combustion gas of liquid oxygen or liquid hydrogen, and is mounted using mounting screws 6.

A measurement electric signal is led out from the temperature measuring platinum wire 3 of the temperature measuring element 5 through the core wire 12 of the MI cable 4, the core wire of the MI cable 34, and the connector 35.

As shown in FIG. 3, the temperature measuring element 101 is made by roughening the outer circumferential surface of a cylindrical platinum cylinder 102 and adhering a coating material 103 such as insulating enamel thereto. is wrapped around it, and a coating material 123 is further attached to the outside thereof. In addition, the coating material 123
Although it is not a transparent body, it is made with a thermometer platinum wire 10 for easy understanding.
4 etc. are expressed with solid lines.

MI cables 105 and 105 are used as lead wires. The MI cable 105 has a core wire 110 housed within a metal sheathed wire 108 with an insulating powder 109 interposed therebetween. This MI cable 105 ・105 is connected to the cylinder 101
Notch 106106 led from the inside and recessed inward
Place the core wire ends 110a and 110a on and weld 107.1
07 and fixed, temperature measuring platinum wire 104 ・104 and M
Connect the I cable 105 and 105.

This temperature measuring element 101 is fitted into the mounting hole 112 of the mounting screw 111, and the proximal peripheral wall of the cylindrical body 102 and the tip of the mounting screw 111 are fixed by laser welding 113. A protection tube 115 having an introduction hole 114 formed in the peripheral wall of the protective tube 115 is fitted into the stepped portion formed at the tip of the mounting screw 111 and fixed by laser welding 116.

The MI cable 105 penetrates into the mounting screw 111 and protrudes through the inflow prevention wall 122, and the end face 117 of the MI cable 105 near the connection part with the temperature-measuring platinum wire 104 is pressure-resistant sealed 118, and the other side The end face 119 is sealed 120 to a moisture-proof degree, and the gap between the mounting screw 111 and the MI cable 105 is filled with wax 121 and sealed. The opening of the sleeve 131 of the mounting screw 111 is located on the cover plate 1.
32, and connect the MI cable 1 to the connector 133.
05 is made conductive. The temperature measuring element 101 is placed in a measurement medium such as liquid oxygen or liquid hydrogen, and is attached to the fuel tank with a mounting screw 111.

The measured electrical signal from the temperature measuring platinum wire 104 of the temperature measuring element 101 is led out to the connector 133 via the core wire 110 of the MI cable 105.

The connection part between the temperature measuring element 201 and the lead wire 202 is made of 4-6 fluoride resin (FEP, trade name: Teflon) 203.
Cover with

The temperature measuring element 1 has a titanium-containing glass ceramic coating material attached to the outer peripheral surface of the MI cable, and a temperature measuring platinum wire is wound around the outer peripheral surface of the MI cable.

Reference numeral 204 is an MI cable in which a core wire is housed with an insulating powder interposed in a platinum-made exterior metal wire, and one end of the core wire is connected to the end of the temperature-measuring platinum wire of the temperature-measuring element,
The core wire at the other end is connected to the copper core wire of the lead wire 202.

The outer periphery of the lead wire 202 is covered with a tape 205 of tetrafluoroplastic (PTFE, trade name: Teflon).

The connection part between the temperature measuring element 201 and the lead wire 202 is
In injection molding, when coating with -6 fluoride resin 203, the wire at the connecting portion is thin due to the flow rate and pressure of the resin, and therefore breaks.

Therefore, it is preformed so that it can be covered with two members, a thin piece of tetrafluoroplastic is sandwiched between the connecting parts, and the connecting parts are covered from both sides with the two members, and heated at 260°C to 350''.
Heat at C and heat from both sides to integrate.

"Effects of the Invention" As described above, the present invention has a temperature measuring element that is brought into direct contact with the measurement medium, so the responsiveness is good, and in particular,
Like a rocket, it can instantly detect moment-by-moment changes in the combustion state and quickly respond to emergencies. In addition, when using under high pressure, the electrical signal was taken out with the MI cable, and the gap between the MI cable and the mounting screw was filled with wax and sealed, and the end face of the MI cable was sealed with high pressure, so the high voltage measurement medium did not leak out. There isn't. Since the outward flange of the temperature measuring element is sandwiched between the mounting screw and the protective tube and fixed by welding, it can withstand use even when subjected to shocks and vibrations. Since the temperature measuring element is a ceramic bar, it can withstand high temperatures.

Moreover, when the temperature measuring element of the present invention is a metal cylinder,
Withstands low temperatures.

Furthermore, as described above, the present invention is a temperature sensor for liquid oxygen/liquid hydrogen in a rocket fuel tank in which the connection part between the temperature measuring element and the lead wire is coated with 4-6 fluoride resin. Even if the temperature sensor is immersed in liquid oxygen or liquid hydrogen in a tank, it will not catch fire or be destroyed at extremely low temperatures.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional front view of a temperature measuring element according to a specific embodiment of the present invention, and FIG. 2 is a partially sectional front view of a rapid response temperature sensor of the present invention. FIG. 3 is a partially sectional front view of a temperature measuring element according to a specific embodiment of the present invention, and FIG. 4 is a partially sectional front view of a quick-response temperature sensor according to the present invention. FIG. 5 is a front view of a specific embodiment of the present invention, and FIG. 6 is a front view of a conventional temperature sensor. 1...Outward flange 2...Ceramic rod-shaped body 3...Temperature measuring wire 4...MI cable 5...Temperature measuring element 6...Mounting hole...Mounting hole 8 ...Step part 9...Introduction hole 10...Protection tube 21...Pressure seal 23...Port 102...Platinum cylinder (example of metal cylinder) 103.
...Coating material 104...Temperature-measuring platinum wire (example of temperature-measuring wire) 105...
・MI cable 101...Temperature measurement element 106...Mounting screw 112...Mounting hole 113...Laser welding (example of welding) 118...Pressure seal 121...Port 201...・Temperature measurement element 202...Lead wire 203...4-6 fluoride resin

Claims (5)

[Claims] (1) Attach a temperature measuring element that is connected in a protruding manner by wrapping a temperature measuring element wire around the outer peripheral surface of the distal end of a ceramic rod-shaped body having an outward flange on the proximal end, and inserting an MI cable as a lead wire into the proximal end. Insert the screw into the mounting hole, engage the outward flange with the stepped part of the mounting hole, fit the proximal end, and fit the protective tube with a measurement medium introduction hole in the peripheral wall from the distal end, and then insert the proximal end. The side end surface is brought into contact with the outward flange, the peripheral wall is fixed to the mounting screw by welding, the end surface of the MI cable is pressure-tightly sealed, and the gap between the mounting screw and the MI cable is filled with wax and sealed. Characteristic temperature sensor. (2) A temperature-measuring wire is wound around the outer peripheral surface of the distal end of a ceramic rod-like body having an outward flange on the proximal end, and an MI cable serving as a lead wire is embedded in the proximal end and connected in a protruding manner. Temperature measuring element of a resistance thermometer. (3) Attach a temperature measuring element to the outer circumferential surface of the metal cylinder, wrap a temperature measuring wire around it, and connect the MI cable as a lead wire in a protruding manner to the proximal end, into the mounting screw mounting hole. A temperature sensor characterized in that an internally fitted metal cylindrical body is fixed to the mounting screw by welding, the end face of the MI cable is sealed against pressure, and the gap between the mounting screw and the MI cable is filled with wax and sealed. . (4) Measurement of a resistance temperature detector characterized in that a coating material is attached to the outer circumferential surface of a metal cylinder, a temperature measuring wire is wound around it, and an MI cable as a lead wire is connected in a protruding manner to the base end side. Warm element. (5) A humidity sensor for liquid oxygen and liquid hydrogen in a rocket fuel tank, characterized in that the connection between the temperature measuring element and the lead wire is coated with 4-6 fluoride resin.