JP2015152336A

JP2015152336A - Temperature measurement device

Info

Publication number: JP2015152336A
Application number: JP2014023991A
Authority: JP
Inventors: 智治新舛; Tomoharu Aramasu; 紀夫西部; Norio Nishibe
Original assignee: Yamari Industries Ltd
Current assignee: Yamari Industries Ltd
Priority date: 2014-02-12
Filing date: 2014-02-12
Publication date: 2015-08-24

Abstract

PROBLEM TO BE SOLVED: To provide a temperature measurement device capable of further improving the responsiveness of a temperature sensor and capable of attaching/removing and also replacing the temperature sensor from a protective tube.SOLUTION: An area s1 of a space S between the outer face of a temperature sensor 2 and the inner face of a protective tube 3, including a position enclosing at least a temperature measurement part 20 of the temperature sensor 2, is filled with heat-resistant particulates 4. An outer circumferential face 21, out of the outer circumferential face of the temperature sensor 2, that faces the area s1 filled with the particulates 4 is provided with a projected streak part 22 extending in spiral form. While particulates are filled in the protective tube 3, the temperature sensor 2 is inserted into the protective tube 3 by rotating it so as to be screwed into the inside of the particulates by the projected streak part 22, the temperature sensor 2 and the protective tube 3 being thereby assembled together.

Description

本発明は、温度センサとこれを内蔵する保護管とよりなる温度測定装置に関する。 The present invention relates to a temperature measuring device including a temperature sensor and a protective tube incorporating the temperature sensor.

この種の温度測定装置としては、例えば特許文献１、２に記載のものが提案されている。これらの文献で提案されている温度測定装置は、内部の温度センサを脱着、交換可能に構成したものであり、保護管を測定対象に固定したまま温度センサのみ交換することが可能な構造である。 As this type of temperature measuring device, for example, those described in Patent Documents 1 and 2 have been proposed. The temperature measuring devices proposed in these documents are configured so that an internal temperature sensor can be removed and replaced, and only the temperature sensor can be replaced while the protective tube is fixed to the measurement target. .

しかしながら、これらの温度測定装置は構造上、先端を溶接で封止したパイプ状の保護管とシース型の温度センサとの間の隙間に空気層が存在し、この空気層が温度センサの応答性を阻害する。保護管をくり抜き型あるいは先端ピース付き（別パーツの封止片の組み付け）とし、温度センサー先端側の測温部に対応する先端部の隙間をできるだけ小さくしたものもあるが、熱膨張差を考慮するとその隙間もある程度の大きさの寸法が必要となり、その間の空気層の存在により応答特性はほとんど改善されない。 However, these temperature measuring devices have a structure in which an air layer exists in the gap between the pipe-shaped protective tube whose end is sealed by welding and the sheath type temperature sensor, and this air layer is responsive to the temperature sensor. Inhibits. Some protection tubes are hollowed out or have a tip piece (attachment of a separate sealing piece) and the tip clearance corresponding to the temperature sensor on the tip side of the temperature sensor is as small as possible. Then, the gap needs to have a certain size, and the response characteristics are hardly improved due to the presence of the air layer therebetween.

温度センサと保護管との間の隙間に粒状物（粉末充填材）を充填した温度測定装置も提案されている（例えば、特許文献３参照。）。しかし、このように粒状物を充填したものは、粒状物が熱で固まり、温度センサが固着して脱離させることはほぼ不可能となる。したがって、このような粒状物を充填した温度測定装置は、温度センサと保護管一式で交換するものであった。 A temperature measuring device in which a gap between the temperature sensor and the protective tube is filled with a granular material (powder filler) has also been proposed (see, for example, Patent Document 3). However, in the case where the particulate matter is filled in this way, the particulate matter is hardened by heat, and it becomes almost impossible for the temperature sensor to be fixed and detached. Therefore, the temperature measuring device filled with such a granular material has been replaced with a temperature sensor and a set of protective tubes.

また、このように粒状物を隙間に充填する場合、粒状物を充填した後に温度センサを所定の位置に押し込んで位置決めすることは粒状物の流動が期待できず実際上困難であるため、あらかじめ所定の位置に温度センサをセットした状態で隙間に粒状物を充填することとなる。しかし、このようにセットした状態で隙間に粒状物を充填することは作業性が悪い。 In addition, when filling the gap with the particulate matter in this way, it is difficult to push the temperature sensor into a predetermined position after filling the particulate matter, and it is difficult to expect the flow of the particulate matter. In the state where the temperature sensor is set at the position, the gap is filled with the particulate matter. However, filling the gaps with the granular material in the set state in this way is inferior in workability.

特開２００８−１１６３０５号公報JP 2008-116305 A 特開２０１３−１５２１１７号公報JP 2013-152117 A 特開２０００−３５３６４号公報JP 2000-35364 A

そこで、本発明が前述の状況に鑑み、解決しようとするところは、温度センサの応答性を向上でき、且つ温度センサの保護管からの脱着、交換も可能な温度測定装置を提供する点にある。 Therefore, in view of the above-described situation, the present invention intends to provide a temperature measuring device that can improve the responsiveness of the temperature sensor and can be attached to and detached from the protective tube of the temperature sensor. .

本発明は、前述の課題解決のために、温度センサと該温度センサを内蔵する保護管とよりなる温度測定装置であって、前記温度センサと保護管との間の隙間のうち、少なくとも前記温度センサの測温部を囲む位置を含む領域に、耐熱性の粒状物を充填してなり、且つ、前記温度センサの外周面のうち、前記領域に対面する外周面上に、螺旋状に延びる突条部を設けてなることを特徴とする温度測定装置を構成した。 In order to solve the above-mentioned problem, the present invention is a temperature measuring device including a temperature sensor and a protective tube including the temperature sensor, and at least the temperature in the gap between the temperature sensor and the protective tube. An area including a position surrounding the temperature measuring portion of the sensor is filled with a heat-resistant granular material, and the protrusion extending in a spiral shape on the outer peripheral surface of the temperature sensor facing the area. A temperature measuring device characterized by providing a strip was constructed.

ここで、前記保護管に前記粒状物を入れた状態で、該保護管に前記温度センサを前記突条部によって粒状物の内部にねじ込むように回転させながら挿入し、互いに組み付けてなるものが好ましい。 Here, in a state where the granular material is put in the protective tube, the temperature sensor is inserted into the protective tube while being rotated so as to be screwed into the granular material by the protrusions, and is assembled to each other. .

また、前記温度センサの外周面のうち、前記粒状物が充填される領域の基端位置に対応する外周面上の位置に、前記隙間を塞ぐ閉止片を突設してなるものが好ましい。 In addition, it is preferable that a closing piece for closing the gap is provided at a position on the outer peripheral surface of the outer peripheral surface of the temperature sensor corresponding to the base end position of the region filled with the particulate matter.

以上にしてなる本願発明に係る温度測定装置は、温度センサの外周面のうち、粒状物が充填される保護管との隙間の領域に対面する外周面上に、螺旋状に延びる突条部を設けたので、粒状物を通じて保護管から温度センサへ熱が滞りなく伝わり、保護管の形状にかかわらず温度センサの応答性を高めることができると同時に、温度センサを交換する場合には、粒状物と温度センサが熱で固着していても、温度センサを相対回転させることで突条部も回転し、固着した粒状物および保護管から温度センサを脱離させ、交換することが可能となる。すなわち保護管を測温対象装置に固定したまま、温度センサのみ取り外して交換することができる。さらに、突条部により温度センサと粒状物との接触面積が増え、これにより熱伝導効率が向上し、温度センサの応答性も著しく向上する。 The temperature measuring device according to the present invention as described above has a spirally extending protrusion on the outer peripheral surface of the temperature sensor that faces the region of the gap between the temperature sensor and the protective tube filled with the particulate matter. Because it is provided, heat can be transferred from the protective tube to the temperature sensor without any delay through the granular material, and the responsiveness of the temperature sensor can be improved regardless of the shape of the protective tube. Even if the temperature sensor is fixed by heat, the protrusion is also rotated by rotating the temperature sensor relatively, and the temperature sensor can be detached from the fixed granular material and the protective tube and replaced. That is, only the temperature sensor can be removed and replaced while the protective tube is fixed to the temperature measurement target device. Furthermore, the contact area between the temperature sensor and the granular material is increased by the protrusions, thereby improving the heat conduction efficiency and significantly improving the responsiveness of the temperature sensor.

また、粒状物を入れた保護管に対して、温度センサを突条部により粒状物の内部にねじ込むように回転させながら挿入し、これにより保護管と温度センサを互いに組み付けて構成したので、保護管に予め粒状物を充填して、そこに温度センサーを所定の位置まで挿入して組み付けることが可能となり、作業性がよく組み付けが容易である。また、ねじ込みであるので温度センサの測温部を設計通りの深さにセットすることができる。 In addition, the temperature sensor is inserted into the protective tube containing the granular material while being rotated so as to be screwed into the granular material by the protrusion, and the protective tube and the temperature sensor are assembled to each other. The tube is filled with granular materials in advance, and the temperature sensor can be inserted and assembled to a predetermined position therein, so that the workability is good and the assembly is easy. Moreover, since it is screwed, the temperature measuring part of the temperature sensor can be set to a designed depth.

また、温度センサの外周面のうち、前記粒状物が充填される領域の基端位置に対応する外周面上の位置に、前記隙間を塞ぐ閉止片を突設してなるので、先端側を下に向けて使用する場合に限らず、横や上に向けて設置する場合でも粒状物の基端側への移動、崩れを防止し、これにより当該閉止片より先端側の領域にのみ粒状物を安定した状態に充填することができる。したがって、温度センサの測温部に近い領域のみに粒状物を配して応答性の向上に寄与させることができ、粒状物を必要最小限とし、コストアップや重量アップを防止できる。さらに、閉止片よりも基端側に粒状物が不要となるため、粒状物が存在することで基端側に熱が逃げてしまうことを回避することができ、センサ測温部に効率よく熱を伝え、応答性を向上させることができる。 Further, since a closing piece for closing the gap is provided at a position on the outer peripheral surface of the temperature sensor corresponding to the base end position of the region filled with the particulate matter, the front end side is lowered. It is not limited to the case where it is used toward the side, and even when it is installed sideways or upward, the granular material is prevented from moving or collapsing to the proximal end side. It can be filled in a stable state. Therefore, the granular material can be arranged only in the region close to the temperature measuring part of the temperature sensor to contribute to the improvement of responsiveness, the granular material can be minimized, and the increase in cost and weight can be prevented. Furthermore, since no particulate matter is required on the base end side of the closing piece, it is possible to prevent heat from escaping to the base end side due to the presence of the particulate matter, and heat can be efficiently applied to the sensor temperature measuring section. Responsiveness can be improved.

（ａ）は本発明の代表的実施形態に係る温度測定装置の縦断面図、（ｂ）は要部の縦断面図。(A) is a longitudinal cross-sectional view of the temperature measuring device which concerns on typical embodiment of this invention, (b) is a longitudinal cross-sectional view of the principal part. 同じく温度測定装置の変形例を示す要部の縦断面図。Similarly, the longitudinal cross-sectional view of the principal part which shows the modification of a temperature measuring device. （ａ）は同じく温度測定装置の他の変形例を示す要部の縦断面図、（ｂ）は更に他の変形例を示す要部の縦断面図。(A) is the longitudinal cross-sectional view of the principal part which shows the other modification of a temperature measuring device similarly, (b) is the longitudinal cross-sectional view of the principal part which shows another modification. （ａ）は比較例１の温度測定装置の構造を示す説明図、（ｂ）は比較例２の温度測定装置の構造を示す説明図。(A) is explanatory drawing which shows the structure of the temperature measuring apparatus of the comparative example 1, (b) is explanatory drawing which shows the structure of the temperature measuring apparatus of the comparative example 2. FIG. 実施例１の各測定値、算出した温度差のグラフ。The graph of each measured value of Example 1 and the calculated temperature difference. 比較例１の各測定値、算出した温度差のグラフ。The graph of each measured value of the comparative example 1, and the calculated temperature difference. 比較例２の各測定値、算出した温度差のグラフ。The graph of each measured value of the comparative example 2, and the calculated temperature difference.

次に、本発明の実施形態を添付図面に基づき詳細に説明する。 Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

本発明の温度測定装置１は、温度センサ２と該温度センサ２を内蔵する保護管３とより構成され、図示しない測温対象装置に保護管を固定し、内部の温度センサ２で測温するものである。たとえば、配管内の流体温度を測定する場合では、温度対象装置である配管に保護管を取り付けるための孔を設け、保護管３を差し込んだ状態で固定し、測温対象である内部流体の温度を保護管３で囲まれた状態で配管内に突出した温度センサ２で測温する。 The temperature measuring device 1 of the present invention is composed of a temperature sensor 2 and a protective tube 3 having the temperature sensor 2 built therein. The protective tube is fixed to a temperature measurement target device (not shown), and the temperature is measured by the internal temperature sensor 2. Is. For example, when measuring the fluid temperature in a pipe, a hole for attaching a protective tube is provided in the pipe that is the temperature target device, and the protective tube 3 is inserted and fixed, and the temperature of the internal fluid that is the temperature measurement target Is measured with the temperature sensor 2 protruding into the pipe in a state surrounded by the protective pipe 3.

特に、本発明では、温度センサ２の外面と保護管３の内面との間の隙間Ｓの少なくとも温度センサ２の測温部２０を囲む位置を含む領域ｓ１に耐熱性の粒状物４が充填される。また、温度センサ２の外周面のうち前記の粒状物４が充填されている領域ｓ１に対面する外周面２１上には、螺旋状に延びる突条部２２が設けられる。粒状物４は、保護管３が受けた熱を温度センサ２に滞りなく伝えるために設けたものであり、突条部２２は、粒状物４により固着した温度センサ２を保護管３から脱着させ、交換可能とするために設けられたもので、温度センサ２自体の表面積増大による伝熱効率の更なる向上効果も得られる。 In particular, in the present invention, the heat-resistant granular material 4 is filled in the region s1 including at least the temperature measuring unit 20 of the temperature sensor 2 in the gap S between the outer surface of the temperature sensor 2 and the inner surface of the protective tube 3. The Further, on the outer peripheral surface 21 of the outer peripheral surface of the temperature sensor 2 that faces the region s <b> 1 filled with the granular material 4, a ridge portion 22 that extends in a spiral shape is provided. The granular material 4 is provided in order to transmit the heat received by the protective tube 3 to the temperature sensor 2 without delay, and the protrusion 22 allows the temperature sensor 2 fixed by the granular material 4 to be detached from the protective tube 3. It is provided so as to be exchangeable, and a further improvement effect of heat transfer efficiency due to an increase in the surface area of the temperature sensor 2 itself can be obtained.

温度センサ２は、従来から公知のものを広く採用でき、主にシース型のサーミスタ、熱電対、測温抵抗体などのシース型温度センサが好適である。この場合、外側の金属シースの外周面２１に突条部２２が設けられる。また、保護管３は温度センサ２を収容し、例えば測温対象である流体の腐食成分による温度センサ２の腐食を未然に防止したり、流体から力を受けて温度センサ２が破損することを防止するものである。保護管３は、従来から公知のもの、例えば耐蝕性を備えたステンレス鋼製パイプなどを広く採用でき、パイプ先端を溶接封止した丸封じ型や平封じ型の安価なものを用いることができる。 As the temperature sensor 2, conventionally known ones can be widely used, and a sheath type temperature sensor such as a sheath type thermistor, a thermocouple, or a resistance temperature detector is mainly suitable. In this case, the protrusion 22 is provided on the outer peripheral surface 21 of the outer metal sheath. Further, the protective tube 3 accommodates the temperature sensor 2 to prevent the temperature sensor 2 from being corroded due to, for example, a corrosive component of the fluid to be measured, or to be damaged by receiving a force from the fluid. It is to prevent. As the protective tube 3, a conventionally known one, for example, a stainless steel pipe having corrosion resistance, can be widely used, and a round seal type or a flat seal type with a pipe end welded and sealed can be used. .

粒状物４は、使用温度などの使用目的に応じて、熱伝導性に優れるアルミナや窒化アルミニウム、炭化ケイ素、ボロンナイトライド、銅、アルミニウムなどのセラミック又は金属の破砕粉又は成形粒子を用いることが好ましい。形状や大きさについても特に限定されない。温度センサ２の測温部２０は、たとえば熱電対では素線同士の接点であり、粒状物４は温度センサ２の測温部２０を囲む位置を含む領域ｓ１に充填されることで、保護管３からの測温対象の熱が粒状物４を通じて測温部２０に効率よく伝わるように構成されている。 As the granular material 4, ceramic or metal crushed powder or molded particles such as alumina, aluminum nitride, silicon carbide, boron nitride, copper, and aluminum, which are excellent in thermal conductivity, may be used depending on the purpose of use such as a use temperature. preferable. The shape and size are not particularly limited. The temperature measuring unit 20 of the temperature sensor 2 is, for example, a contact between strands in a thermocouple, and the granular material 4 is filled in a region s1 including a position surrounding the temperature measuring unit 20 of the temperature sensor 2, thereby protecting the tube. The heat to be measured from 3 is efficiently transmitted to the temperature measuring unit 20 through the granular material 4.

突条部２２は、螺旋状に延びるスクリュー状の部材であり、温度センサ２を脱離させる際にねじ山として機能するものである。突条部２２は保護管３からの脱着機能を有しているだけでなく、温度センサ２にとって最小限の熱容量の増加で粉末からの受熱面積を極大化する効果も期待できる。したがって、断面形状は本例では矩形の板状とされているが、これに何ら限定されない。また突出高さも保護管内面の近傍まで延び、受熱面積増大とともに保護管から直接的に熱を受けとることも期待しているが、これについても限定されるものではない。 The protruding portion 22 is a screw-like member extending in a spiral shape, and functions as a thread when the temperature sensor 2 is detached. The protrusion 22 not only has a function of detaching from the protective tube 3, but also can be expected to maximize the heat receiving area from the powder by increasing the minimum heat capacity for the temperature sensor 2. Therefore, although the cross-sectional shape is a rectangular plate shape in this example, it is not limited to this. The protrusion height also extends to the vicinity of the inner surface of the protective tube, and it is expected to receive heat directly from the protective tube as the heat receiving area increases, but this is not limited.

また、突条部２２は、温度センサ外周面のうち、粒状物４が充填された領域ｓ１に対面する範囲のうち軸方向の全範囲に設ける必要はなく、一部に設けて機能させることもできる。軸方向の複数の箇所に断続的に設けてもよいし、互いに平行な多重螺旋形態とすることもできる。ただし、温度センサ挿着の際、後述のようにあらかじめ保護管３に充填された粒状物４にねじ込んで挿着する場合には、先端部の近くまで突条部２２が設けられる。 Further, the protrusion 22 does not need to be provided in the entire range in the axial direction in the range facing the region s1 filled with the particulate matter 4 on the outer peripheral surface of the temperature sensor, and may be provided and function in a part. it can. It may be provided intermittently at a plurality of locations in the axial direction, or may be in the form of multiple spirals parallel to each other. However, when the temperature sensor is inserted, when the screw is inserted into the granular material 4 filled in the protective tube 3 in advance as will be described later, the protrusion 22 is provided to the vicinity of the tip.

組み付けは、まず保護管３の内部に粒状物４を適量、例えば温度センサ２の外径の概ね１５倍〜２０倍程度の深さまで入れた後、温度センサ２を突条部２２によって粒状物４にねじ込むように回転させながら所定の位置まで挿入することで組み付けられる。 For assembly, first, an appropriate amount of the granular material 4 is put in the protective tube 3 to a depth of, for example, about 15 to 20 times the outer diameter of the temperature sensor 2, and then the temperature sensor 2 is inserted into the granular material 4 by the protrusion 22. It is assembled by inserting it into a predetermined position while rotating it so as to be screwed into.

そして、使用後に保護管３から取り外す際には、挿入時とは逆方向に温度センサ２を回転させながら容易に引き抜くことができる。このように本発明では温度センサに螺旋状の突条部２２を設けることで、温度センサ２をあたかもねじのように回転させながら粒状物４中を前進、後進させることができ、保護管からの交換抜き取り時、および新規センサーの組み込み時の脱着を容易に行うことができるのである。尚、粒状物４を保護管３内部に先に充填して温度センサ２をねじ込んで組み付けること以外に、保護管３内の所定位置に温度センサ２を先に配した状態で、基端側の隙間から粒状物４を充填することも勿論可能である。 And when removing from the protection tube 3 after use, it can pull out easily, rotating the temperature sensor 2 in the reverse direction to the time of insertion. As described above, in the present invention, by providing the temperature sensor with the spiral ridge 22, the temperature sensor 2 can be moved forward and backward while rotating as if it were a screw. It can be easily attached / detached at the time of replacement and installation of a new sensor. In addition to the fact that the granular material 4 is first filled in the protective tube 3 and the temperature sensor 2 is screwed and assembled, the temperature sensor 2 is disposed at a predetermined position in the protective tube 3 in advance, It is of course possible to fill the granular material 4 from the gap.

本実施形態では、さらに温度センサ２外周面における領域ｓ１の基端の位置ｓ１０に対応する位置２４に、基端側から領域ｓ１の隙間を塞ぐ閉止片２３が突設されている。閉止片２３は保護管３内面の近傍まで延び、保護管３内に挿入可能で且つ粒状物４が基端側に漏れ出ない、或いは漏れ出にくい程度の寸法とされている。温度測定装置１の測温対象装置への取付方向は真下方向とは限らず、横方向や上方向など様々な方向に取り付けられ、振動も生じる場合が多い。このような状況で使用する場合、粒状物４が領域ｓ１から移動して粒状物４の充填密度が低下し、空隙が生じたりすると上述した伝熱効果が低下する。 In the present embodiment, a closing piece 23 is further projectingly provided at the position 24 corresponding to the base end position s10 of the region s1 on the outer peripheral surface of the temperature sensor 2 from the base end side. The closing piece 23 extends to the vicinity of the inner surface of the protective tube 3 and is dimensioned so that it can be inserted into the protective tube 3 and the granular material 4 does not leak out or hardly leaks out to the proximal end side. The mounting direction of the temperature measuring device 1 to the temperature measuring target device is not limited to the directly downward direction, and is often mounted in various directions such as a lateral direction and an upward direction, and vibrations often occur. When used in such a situation, if the granular material 4 moves from the region s1 and the packing density of the granular material 4 decreases and voids are generated, the above-described heat transfer effect decreases.

これを防止するために粒状物４を温度センサ２と保護管３の隙間Ｓの全域に充填することもできるが、コストがかかるし保護管３からの熱の一部が当該粒状物４を通じて基端側に移動してしまう。そこで本実施形態のように閉止片２３を設け、必要な隙間領域ｓ１にのみ粒状物４を充填し且つ他へ移動して充填密度の低下するようなことを防止したものが好ましい。すなわち閉止片２３により粒状物４の使用を必要最小限としつつ十分な伝熱効果を維持し、温度センサ２の応答性向上に寄与させることが可能となる。閉止片２３の基端側の端子箱５との間の領域ｓ２に保温材を仕込むことで、熱の逃げを防止し、更なる応答性の向上も見込める。 In order to prevent this, the granular material 4 can be filled in the entire gap S between the temperature sensor 2 and the protective tube 3, but this is costly and a part of the heat from the protective tube 3 passes through the granular material 4. It moves to the end side. Therefore, it is preferable that the closing piece 23 is provided as in the present embodiment, and the granular material 4 is filled only in the necessary gap region s1 and is prevented from moving to the other to lower the filling density. That is, the closing piece 23 can maintain a sufficient heat transfer effect while minimizing the use of the granular material 4, and contribute to improving the responsiveness of the temperature sensor 2. By introducing a heat insulating material into the region s2 between the terminal piece 5 on the base end side of the closing piece 23, heat escape is prevented and further improvement in response can be expected.

本実施形態では基端側は端子箱５を設け、該端子箱５から延びる図示しない補償導線で測定器に接続されるものを例示しているが、端子箱を介することなく脱着コネクタを設けたものなど、従来から公知の種々の構造を採用できる。 In this embodiment, the base end side is provided with a terminal box 5 and is illustrated as being connected to a measuring instrument by a compensation lead wire (not shown) extending from the terminal box 5, but a detachable connector is provided without going through the terminal box. Various known structures such as those can be employed.

また保護管３は、パイプ先端を溶接封止した丸封じ型や平封じ型の安価なもの以外に、例えば図２に示すように筒状本体３０の先端に別途形成した封止片３１を溶接した先端ピース付きの形態としたものでもよい。封止片３１は温度センサ２先端を受け入れる凹部３１ａが形成されており、温度センサ２と凹部３１ａとの間には熱膨張差を考慮しても密着しない程度の所定の小さい隙間ｓ１１が維持されている。この隙間ｓ１１は温度センサ２を脱離させることを可能とするものであるが、この隙間ｓ１１にも粒状物４を充填し、温度センサ２の応答特性の向上が図られる。 Further, the protective tube 3 is welded with a sealing piece 31 separately formed at the tip of the cylindrical main body 30 as shown in FIG. 2, for example, in addition to a round seal type or a flat seal type with a pipe tip welded and sealed. It may be in the form with a tip piece. The sealing piece 31 is formed with a concave portion 31a for receiving the tip of the temperature sensor 2, and a predetermined small gap s11 is maintained between the temperature sensor 2 and the concave portion 31a so as not to be in close contact even if a thermal expansion difference is taken into consideration. ing. The gap s11 allows the temperature sensor 2 to be detached. However, the gap s11 is also filled with the particulate matter 4, so that the response characteristics of the temperature sensor 2 can be improved.

また、図３（ａ）に示すようにくりぬき保護管としてもよい。この場合も同様に温度センサ２の先端部に対応する位置の内径を比較的小さく設定し、温度センサ２の外周面との間に熱膨張差を考慮しても密着しない程度の所定の小さい隙間ｓ１２が維持され、同じく粒状物４が充填されている。 Moreover, it is good also as a hollow protection tube as shown to Fig.3 (a). In this case as well, a predetermined small gap is set such that the inner diameter at the position corresponding to the tip of the temperature sensor 2 is set to be relatively small and does not adhere to the outer peripheral surface of the temperature sensor 2 even if the thermal expansion difference is taken into consideration. s12 is maintained and the granular material 4 is also filled.

尚、図２、図３（ａ）のように隙間ｓ１１、ｓ１２を設けるものでは、当該箇所に挿入される温度センサ２先端部の外周面には突条部２２は無く、それよりも基端側の位置に設けている。このように先端部に突条部２２が無くても基端側の突条部２２の存在により温度センサ２を脱着する推進力が得られるためであるが、例えば図３（ｂ）に示すようにこの隙間ｓ１２にも比較的突出量の小さい突条部２２ａを設け、受熱面積の増大による熱伝導性の向上、応答性の向上を図ることも好ましい。 2 and 3A, the gaps s11 and s12 are provided, and the protrusion 22 is not provided on the outer peripheral surface of the distal end portion of the temperature sensor 2 to be inserted into the portion, and the base end is more than that. It is provided on the side position. Thus, even if there is no ridge 22 at the tip, a driving force for detaching the temperature sensor 2 can be obtained due to the presence of the ridge 22 on the proximal end side. For example, as shown in FIG. It is also preferable to provide a protrusion 22a having a relatively small protrusion amount in the gap s12 to improve thermal conductivity and responsiveness by increasing the heat receiving area.

以上、本発明の実施形態について説明したが、本発明はこうした実施例に何ら限定されるものではなく、本発明の要旨を逸脱しない範囲において種々なる形態で実施し得ることは勿論である。 Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and can of course be implemented in various forms without departing from the gist of the present invention.

次に、本発明の実施例と従来からの比較例の各装置について応答性の試験を行った結果について説明する。 Next, the results of a responsiveness test performed on each device of the example of the present invention and the conventional comparative example will be described.

本発明に係る実施例１は、図１の構造であり、保護管は外径２１．７ｍｍ、内径１６．１ｍｍ、厚み２．８ｍｍのステンレス（ＳＵＳ３０４）製のパイプの先端を同厚みで溶接により丸封じしたもので、充填する粒状物はアルミナ粉末とし、保護管の先端位置から約２００ｍｍの位置まで充填した。また内装する温度センサは外径８ｍｍの従来からのシース熱電対（シース材質インコネル６００のＮタイプシース熱電対）の金属シース外面に図１に示す突条部を粒状物が存在する範囲に螺旋状に設けたものとし、その先端位置が保護管の先端位置より１０ｍｍの位置となるように粒状物中に回転させながら挿入してセットしたものである。 Example 1 according to the present invention has the structure shown in FIG. 1, and the protective tube is welded at the same thickness to the tip of a stainless steel (SUS304) pipe having an outer diameter of 21.7 mm, an inner diameter of 16.1 mm, and a thickness of 2.8 mm. The granular material to be filled was made of alumina powder and filled from the tip position of the protective tube to a position of about 200 mm. Further, the temperature sensor to be installed is a spiral shape in the range where the granular material is present on the outer surface of the metal sheath of a conventional sheathed thermocouple having an outer diameter of 8 mm (N-type sheathed thermocouple of sheath material Inconel 600). And inserted into the granular material while being rotated so that the tip position is 10 mm from the tip position of the protective tube.

比較例は、図４（ａ），（ｂ）に示す２種類（比較例１、２）を用意した。比較例１は、実施例１と同じ材質、構造、寸法の保護管で、温度センサも突条部を設けないこと以外は実施例１と同じ材質、構造、寸法のシース熱電対を用い、保護管と温度センサとの間の粒状物は充填されていないものである。 Two types of comparative examples (Comparative Examples 1 and 2) shown in FIGS. 4A and 4B were prepared. Comparative Example 1 is a protective tube having the same material, structure, and dimensions as Example 1, and the temperature sensor also uses a sheathed thermocouple having the same material, structure, and dimensions as Example 1 except that no protrusion is provided. The particulate material between the tube and the temperature sensor is unfilled.

比較例２は、図４（ｂ）に示すように実施例１と同じパイプの先端に温度センサ先端を受け入れる凹部を有する保護管と同材質の金属製封止片を溶接して封止したものである。温度センサは突条部を設けないこと以外は実施例１と同じ材質、構造、寸法のシース熱電対を用い、保護管と温度センサとの間の粒状物は充填されていないものである。 In Comparative Example 2, as shown in FIG. 4 (b), a metal sealing piece made of the same material as the protective tube having a recess for receiving the temperature sensor tip is welded and sealed to the tip of the same pipe as in Example 1. It is. The temperature sensor uses a sheath thermocouple having the same material, structure, and dimensions as in Example 1 except that no protrusion is provided, and the particulate matter between the protective tube and the temperature sensor is not filled.

応答性の試験は、実施例１、比較例１、２の各温度測定装置を試験炉（縦型環状炉）内に取り付け、室温から約６００℃まで徐々に加熱していった際の上記保護管内のシース熱電対の測定値と、保護管の外周面上の先端から４０ｍｍの位置に別途取り付けた温度センサ（外径０．５ｍｍ、シース材質インコネル６００のＫタイプシース熱電対）の測定値をそれぞれ記録し、両者の測定値の温度差を算出して測定対象（炉内雰囲気）の温度変化に対する応答性を調べた。 In the responsiveness test, each of the temperature measuring devices of Example 1 and Comparative Examples 1 and 2 was installed in a test furnace (vertical annular furnace), and the above-mentioned protection when gradually heated from room temperature to about 600 ° C. The measured value of the sheathed thermocouple in the tube and the measured value of the temperature sensor (K-type sheathed thermocouple with an outer diameter of 0.5 mm, sheath material Inconel 600) separately attached at a position 40 mm from the tip on the outer peripheral surface of the protective tube Each was recorded, the temperature difference between the measured values of both was calculated, and the responsiveness to the temperature change of the measurement target (furnace atmosphere) was examined.

図５〜７はそれぞれ実施例１、比較例１、２の測定値、温度差をグラフ化したものである。破線は測定対象（炉内雰囲気）の温度変化（保護管外面に取り付けた上記別途の温度センサ測定値）であり、一点鎖線はシース熱電対による測定値であり、実線は両者の温度差の変化である。 5 to 7 are graphs showing measured values and temperature differences in Example 1 and Comparative Examples 1 and 2, respectively. The broken line is the temperature change of the measurement target (atmosphere in the furnace) (measured value of the above-mentioned separate temperature sensor attached to the outer surface of the protective tube), the alternate long and short dash line is the measured value by the sheath thermocouple, and the solid line is the change in temperature difference between the two It is.

グラフからも分かるように、実施例１では初期、温度差が３７℃に至るがその後は速やかに温度差が減少し、９分で温度差１０℃以下となり１８分で温度差５℃程度に安定するのに対し、比較例１では初期の温度差が１００℃以上まで上昇し、温度差１０℃以下となるまで２０分以上かかり、３０分経過しても温度差５℃以下に安定しない。比較例２では初期の温度差が３９℃に至り、温度差１０℃以下となるまで２０分以上かかり、３０分経過しても温度差５℃以下に安定しない。以上のことから、本発明の温度測定装置は初期応答性が顕著に優れていることがわかる。 As can be seen from the graph, in Example 1, the temperature difference reached 37 ° C. in the initial stage, but thereafter the temperature difference decreased rapidly, became less than 10 ° C. in 9 minutes, and stabilized to about 5 ° C. in 18 minutes. On the other hand, in Comparative Example 1, the initial temperature difference rises to 100 ° C. or more, takes 20 minutes or more until the temperature difference becomes 10 ° C. or less, and does not stabilize at a temperature difference of 5 ° C. or less even after 30 minutes. In Comparative Example 2, the initial temperature difference reaches 39 ° C., and it takes 20 minutes or more until the temperature difference becomes 10 ° C. or less. Even after 30 minutes, the temperature difference is not stable to 5 ° C. or less. From the above, it can be seen that the temperature measuring device of the present invention is remarkably excellent in initial response.

また、下記表１は、測定対象（炉内雰囲気）の温度（保護管外面に取り付けた上記別途の温度センサ測定値）が５７０℃、５９０℃、６００℃のときの温度差の数値である。これにより本発明の温度測定装置は温度差（測定誤差）が４度程度に抑えられており、且つ安定しており、測定誤差および応答性に顕著に優れていることがわかる。 Table 1 below shows numerical values of the temperature difference when the temperature of the measurement target (furnace atmosphere) (the measured value of the separate temperature sensor attached to the outer surface of the protective tube) is 570 ° C, 590 ° C, and 600 ° C. Thus, it can be seen that the temperature measurement device of the present invention has a temperature difference (measurement error) of about 4 degrees, is stable, and is remarkably excellent in measurement error and responsiveness.

１温度測定装置
２温度センサ
３保護管
４粒状物
５端子箱
２０測温部
２１外周面
２２、２２ａ突条部
２３閉止片
２４位置
３０筒状本体
３１封止片
３１ａ凹部
Ｓ隙間
ｓ１領域
ｓ２領域
ｓ１０位置
ｓ１１隙間
ｓ１２隙間 DESCRIPTION OF SYMBOLS 1 Temperature measuring device 2 Temperature sensor 3 Protective tube 4 Granule 5 Terminal box 20 Temperature measuring part 21 Outer peripheral surface 22, 22a Projection part 23 Closing piece 24 Position 30 Cylindrical main body 31 Sealing piece 31a Recess S S gap s1 area s2 area s10 position s11 gap s12 gap

Claims

温度センサと該温度センサを内蔵する保護管とよりなる温度測定装置であって、
前記温度センサと保護管との間の隙間のうち、少なくとも前記温度センサの測温部を囲む位置を含む領域に、耐熱性の粒状物を充填してなり、
且つ、前記温度センサの外周面のうち、前記領域に対面する外周面上に、螺旋状に延びる突条部を設けてなることを特徴とする温度測定装置。 A temperature measuring device comprising a temperature sensor and a protective tube containing the temperature sensor,
Of the gap between the temperature sensor and the protective tube, a region including at least a position surrounding the temperature measuring portion of the temperature sensor is filled with a heat-resistant granular material,
In addition, a temperature measuring device is characterized in that a spirally extending protrusion is provided on the outer peripheral surface of the temperature sensor that faces the region.

前記保護管に前記粒状物を入れた状態で、該保護管に前記温度センサを前記突条部によって粒状物の内部にねじ込むように回転させながら挿入し、互いに組み付けてなる請求項１記載の温度測定装置。 2. The temperature according to claim 1, wherein the temperature sensor is inserted into the protective tube while being rotated so as to be screwed into the granular material by the protrusions in a state where the granular material is put in the protective tube, and assembled together. measuring device.

前記温度センサの外周面のうち、前記粒状物が充填される領域の基端位置に対応する外周面上の位置に、前記隙間を塞ぐ閉止片を突設してなる請求項１又は２記載の温度測定装置。 The closing piece which closes the said clearance gap protrudes in the position on the outer peripheral surface corresponding to the base end position of the area | region with which the said granular material is filled among the outer peripheral surfaces of the said temperature sensor. Temperature measuring device.