JP2572893B2 - High-speed response type temperature sensor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-speed response type temperature sensor, and more particularly to a high-speed response type temperature sensor for measuring the temperature of flowing gas at high speed.

[0002]

2. Description of the Related Art A resistance temperature detector such as platinum has been widely used as a conventional industrial temperature sensor. According to this principle, the temperature is measured by using the property that the electric resistance of a conductor such as platinum depends on the temperature. A conventional industrial temperature sensor is shown in FIG. 1 and FIG.

A sheath 101 made of SUS or the like is firmly filled with an insulating material 102 of magnesium oxide powder, and a resistance temperature detector 103 is accommodated therebetween.
4 and 105, and the conductor 104
06, and the conductors 105 and 108 are connected to the conductor 105, and the end of the sheath 101 is sealed with epoxy resin 109 so that the insulation 102 absorbs water vapor in the air and does not deteriorate.

[0004] A resistance thermometer 103 is made of a coil-shaped platinum resistance wire 11 with alumina powder 112 interposed between two accommodating holes 111 formed in a round bar-shaped alumina insulator 110 in the axial direction.
3 and both ends of the platinum resistance wire 113
· 105 respectively, the accommodation hole 111 is enamel 1
Sealed at 14. The conductors 107, 108, and 109 are connected to a receiving instrument (not shown), and the temperature of the resistance temperature detector 103 is measured by the receiving instrument.

[0005]

In the above-mentioned industrial temperature sensor, the sheath 1 is connected to the platinum resistance wire 113 for detecting the temperature.
Until heat is transmitted from the outside of the wire 101, the heat is transmitted through many members of the sheath 101, the insulating material 102, the alumina insulator 110 of the resistance temperature detector 103, and the alumina powder 112. Therefore, the conventional industrial temperature sensor does not have responsiveness that can follow a liquid or gas whose temperature changes at a high speed.

The conventional improved temperature sensor has a response speed of about 0.3 sec. To a liquid, but a gas having a small heat capacity and a flow velocity of 3 m / sec. Has a response speed of 10 sec.
It is longer. In addition, the appearance of a sufficiently fast response type temperature sensor in an explosion-proof area is desired.

[0007]

SUMMARY OF THE INVENTION In view of the above circumstances, the present invention provides an insulating coating on the outer periphery of a thin cylindrical winding frame in order to provide a sufficiently fast response type temperature sensor in an explosion-proof area. Then, the resistance wire is helically embedded in the insulating coating, a cut-and-raised piece is protruded toward the inside of the winding frame, and the core wire is housed on the inner wall of the winding frame with an insulating material interposed in the sheath. The MI cable tip is abutted on the cut-and-raised piece by contacting the MI cable tip, the core wire extending from the MI cable tip and the end of the resistance wire are connected, and a slight gap is interposed in the insulating coating. To fit the protection tube outside,
The winding frame, the protection tube, the MI cable, and the cut and raised pieces are sealed.

Further, according to the present invention, in order to obtain a high-speed response type, an insulating coating is applied to the inner periphery of a thin cylindrical winding frame, and a coil-shaped resistance wire is arranged on the surface of the insulating coating along the circumferential direction. Then, a high-speed response type temperature sensor was formed by applying a centrifugal force to the resistance wire by rotating it around the axis and bonding it.

[0009]

According to the present invention, an insulating coating is applied to the outer periphery of a thin cylindrical winding frame, a resistance wire is helically embedded in the insulating coating, and a cut-and-raised piece protruding inward is formed on the winding frame. On the inner side of the winding frame, the MI cable containing the core wire is abutted with an insulating material interposed in the sheath, and the MI cable tip is fitted into the cut and raised piece, and the core wire extending from the MI cable tip and the The end of the resistance wire was connected, the protection tube was fitted around the insulation coating with a slight gap therebetween, and the winding frame, the protection tube, and the MI cable and the cut and raised pieces were sealed. Since heat is transmitted to the resistance wire through the air layer and the insulating coating, the responsiveness is good. Also, since the resistance wire is completely sealed, it can be used in an explosion-proof area.

According to the present invention, an insulating coating is applied to the inner periphery of a winding frame of a thin-walled cylinder, and a coil-shaped resistance wire is arranged along the circumferential direction on the surface of the insulating coating, and is rotated about an axis. Since the resistance wire is adhered by applying a centrifugal force, heat is transmitted from the protection tube to the resistance wire immediately through the insulating coating, resulting in good responsiveness. Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The first invention will be described with reference to FIGS.
FIG. 3 shows the whole, FIG. 4 shows a protective tube for covering and protecting the temperature-sensitive part of the present temperature sensor, and FIG. 5 shows an enlarged view of the temperature-sensitive part.

As shown in FIGS. 3 and 5, an insulating coating 2 is applied to the outer periphery of a platinum thin cylindrical winding frame 1, and a platinum resistance wire 3 is spirally wound around the insulating coating 2.
The insulating coating 2 is further applied thereon, and the resistance wire 3 is embedded in the insulating coating 2. A cut-and-raised piece 4 protruding inward is protruded from the winding frame 1, and M
M containing platinum core wire 7 with gO insulating material 6 interposed
The I cable 8 is made to abut against the inner wall of the winding form 1 in the axial direction,
The tip of the cable 8 is fitted into the cut-out piece 4 and the core wire 7 extending from the tip of the MI cable 8 is connected to the end of the resistance wire 3. The front end of the MI cable 8 fitted inside the cut-and-raised piece 4 is hermetically sealed by welding 9 over the entire circumference with the cut-and-raised piece 4 to have an explosion-proof function.

[0013] Insulation coating 2 applied to the outer periphery of the winding form 1
In order to protect the protection tube 13, the protection tube 13 is externally fitted via the rings 11 and 12 so that a slight gap 10 of the air layer exists on the outer periphery thereof, and the rings 11 and 12, the winding frame 1, and the ring 11.
2 and the protection tube 13 are welded 14.15, 16.1.
7, the resistance wire 3 is sealed over the entire circumference.

The base end of the winding frame 1 is internally fitted to the distal end of a connection fitting 18 and fixed by welding 19. The base end of the connection fitting 18 is separately fitted to the distal end of a large-diameter connection fitting 51 and welded 20. Stick. A thread 21 is engraved on the connection fitting 51, and the above-mentioned temperature sensing portion is covered with a protection tube 22 shown in FIG. 4, and its base end is screwed to the thread 21 to attach the protection tube 22. . The lower end of the attached protective tube 22 is located below the lower end of the winding frame 1. The protective tube 22 has a large number of passage holes 2 through which the base to be measured passes.
3 is drilled.

The heat of the gas to be measured is transmitted to the resistance wire 3 through the protective tube 13, the gap 10 between the air layers, and a few members of the insulating coating 2, so that the resistance wire 3 follows a drastic temperature change. Can measure the temperature. The resistance wire 3 is
Since the connection portion with the MI cable 8 and the space between the protection tube 13 and the winding frame 1 are housed in a sealed state, it can be used in an explosion-proof area.

The second invention will be described with reference to FIGS. FIGS. 6, 7, and 8 show an example. A round rod insulator 3 in which two insertion holes 31 are drilled in the axial direction and lead wires are inserted.
2 is fixed along the inner surface axial direction of the platinum winding frame 33,
An enamel 34 is applied to the entire circumference of the winding frame 33. Next, the platinum resistance wire 35 of the spiral coil is connected to the winding frame 3.
3 are accommodated along the inner surface circumferential direction, and lead wires 36 passing through the insertion holes 31 of the insulator 32 are connected to both ends of the resistance wire 35, respectively. Thereafter, when the winding frame 33 is heated and rotated about the axis, the resistance wire 35 receives centrifugal force and adheres to the inner periphery of the enamel 34 as shown.

FIG. 9 shows another example. Enamel 34 is applied to the inner periphery of winding frame 33, resistance wire 35 is adhered to the inner periphery by centrifugal force, and lead wire 36 is inserted through insulator 32 to be fixed and connected to resistance wire 35. In order to enable use in the area, the MI cable 41 is inserted into the winding frame 33, and the core wire 42 of the MI cable 41 and the lead wire 3 are inserted.
6 and the openings at both ends of the winding frame 33 are closed by lids 43 and 44 and fixed by welding 45, 46 and 47.

In the second invention, in the examples shown in FIGS. 6, 7, and 8, the temperature can be measured by the resistance wire 35 immediately after passing through the enamel 34, and the temperature can be measured following any severe temperature change. FIG.
In the example, the temperature can be measured with a high-speed response and the resistance wire 35 is sealed, so that it can be used in an explosion-proof area.

[0019]

As described above, according to the present invention, an insulating coating is applied to the outer periphery of a thin cylindrical winding frame, a resistance wire is helically embedded in the insulating coating, and the cutting is performed on the winding frame toward the outer periphery. A protruding piece is protruded, and an MI cable containing a core wire is brought into contact with the inner wall of the winding frame with an insulating material interposed in a sheath, and the front end of the MI cable is cut and raised, and the MI cable is fitted inside the piece.
The core wire extending from the cable tip is connected to the end of the resistance wire, the protection tube is fitted over the insulation coating with a slight gap therebetween, and the winding frame, the protection tube, and the MI cable are cut and raised. Because it is a sealed high-speed response type temperature sensor, it can provide a sufficiently high-speed response in the explosion-proof area.

Further, according to the present invention, an insulating coating is applied to the inner periphery of a thin cylindrical winding frame, a coil-shaped resistance wire is arranged along the circumferential direction on the surface of the insulating coating, and is rotated about an axis. Since the temperature sensor is a high-speed response type temperature sensor which is adhered by applying a centrifugal force to the resistance wire, the heat of the base to be measured is transmitted from the protection tube to the resistance wire immediately through the insulating coating, and the response is good.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a conventional industrial temperature sensor.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a front view showing the whole of the first invention and a half section thereof;

FIG. 4 is a front view in which a half of a protective tube that covers and protects a temperature sensing portion of the present temperature sensor is sectioned.

FIG. 5 is an enlarged vertical sectional view of a temperature sensing part.

FIG. 6 is a perspective view of an example of the second invention.

FIG. 7 is a longitudinal sectional view of FIG. 6;

FIG. 8 is an enlarged vertical sectional view of a main part.

FIG. 9 is a vertical sectional view of a high-speed response type temperature sensor used in an explosion-proof area in which an opening of a winding frame is sealed, according to another example of the second invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Wrapping frame 2 ... Insulation coating 3 ... Resistance wire 4 ... Cut-and-raised piece 8 ... MI cable 7 ... Core wire 10 ... Gap 13 ... Protection tube 33 ... Wrapping frame 34 ... Insulation coating 35 ... Coiled resistance wire

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Manabu Fukaoka 1-1-1 Moto-Akasaka, Minato-ku, Tokyo Inside the Tokyo Branch of Okazaki Plant (72) Inventor Haruki Nakamura 1-1-1, Moto-Akasaka, Minato-ku, Tokyo No. 15 Okazaki Plant Tokyo Branch (72) Inventor Yukihiro Kaneda 1-5-20 Kaigan, Minato-ku, Tokyo Tokyo Gas Co., Ltd. (56) References JP-A-61-202129 (JP, A) Kaisho 57-105939 (JP, U)

Claims (2)

(57) [Claims] An insulation coating is applied to the outer periphery of a thin cylindrical winding frame, a resistance wire is helically embedded in the insulating coating, and a cut-and-raised piece protruding inward is protruded from the winding frame. An MI cable containing a core wire with an insulating material interposed in a sheath is brought into contact with the inner wall of the frame to fit the MI cable tip into the cut-and-raised piece, and the core wire extending from the MI cable tip and the resistance wire A high-speed response type temperature sensor in which an end portion is connected, a protective tube is externally fitted to the insulating coating with a slight gap therebetween, and the winding frame, the protective tube, the MI cable, and the cut-and-raised piece are sealed. 2. An insulation coating is applied to the inner periphery of a thin cylindrical winding frame, and a coil-shaped resistance wire is arranged on the surface of the insulation coating along a circumferential direction, and the resistance wire is rotated around an axis. High-speed response type temperature sensor that is adhered by applying centrifugal force to the surface.