JPH0743220A - Thermistor temperature sensor - Google Patents
Thermistor temperature sensorInfo
- Publication number
- JPH0743220A JPH0743220A JP20576393A JP20576393A JPH0743220A JP H0743220 A JPH0743220 A JP H0743220A JP 20576393 A JP20576393 A JP 20576393A JP 20576393 A JP20576393 A JP 20576393A JP H0743220 A JPH0743220 A JP H0743220A
- Authority
- JP
- Japan
- Prior art keywords
- temperature sensor
- thermistor
- cement
- temperature
- fluid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は，自動車の排気ガス等の
温度を測定するサーミスタ温度センサに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermistor temperature sensor for measuring the temperature of exhaust gas of an automobile.
【０００２】[0002]
【従来技術】温度センサには各種の方式のものがある
が，その１つとして，サーミスタの温度による抵抗変化
を利用したサーミスタ温度センサがある。サーミスタ温
度センサは，例えば，サーミスタ素子を絶縁管の先端か
ら突出させてそれを検査対象に近接させて温度を測定す
る。また，サーミスタ素子を保護するために上記サーミ
スタ素子と絶縁管とを金属管中に収容したものも多く用
いられている。2. Description of the Related Art There are various types of temperature sensors, and one of them is a thermistor temperature sensor that utilizes the resistance change due to the temperature of the thermistor. The thermistor temperature sensor measures the temperature by, for example, projecting the thermistor element from the tip of the insulating tube and bringing it close to the inspection object. In addition, in order to protect the thermistor element, the one in which the thermistor element and the insulating tube are housed in a metal tube is often used.
【０００３】そして，金属管に上記サーミスタ素子と絶
縁管とを固定する方法として耐熱セメントを用いる構造
が提案されている（特開昭６２−２７８４２１号公報参
照）。即ち，上記温度センサ９は，図６に示すように，
絶縁管９２２の先端からサーミスタ素子９１を突出さ
せ，セメント９２１で保持したサーモユニット９０を金
属管９３に収容し，金属管９３に注入した耐熱セメント
９４中に埋設して上記サーモユニット９０を固定する。A structure using heat-resistant cement has been proposed as a method for fixing the thermistor element and the insulating tube to the metal tube (see Japanese Patent Laid-Open No. 62-278421). That is, the temperature sensor 9 is, as shown in FIG.
The thermistor element 91 is projected from the tip of the insulating tube 922, the thermo unit 90 held by the cement 921 is housed in the metal tube 93, and the thermo unit 90 is embedded by being embedded in the heat-resistant cement 94 injected into the metal tube 93 to fix the thermo unit 90. .
【０００４】そしてサーミスタ素子９１と接続したサー
モユニット９０のリード端子９５を信号取出し用のリー
ド線９６と金属管９３内で接続する。このように，耐熱
セメント９４（以下単に「セメント」という）によって
サーモユニット９０を金属管９３に固定する方法は構成
部品点数が少なく構造が簡素で安価であるという利点が
ある。Then, the lead terminal 95 of the thermo unit 90 connected to the thermistor element 91 is connected to the lead wire 96 for taking out the signal in the metal tube 93. As described above, the method of fixing the thermo unit 90 to the metal tube 93 with the heat-resistant cement 94 (hereinafter, simply referred to as “cement”) has advantages that the number of constituent parts is small, the structure is simple, and the cost is low.
【０００５】また，セメント９４は，被測温流体の温度
を金属管９３を介してサーモユニット９０に伝達する役
目も果たす。従って，セメント９４は比較的熱伝導率の
良好なものが用いられる。なお図６において，符号９７
は温度センサ９を測温部に装着するためのネジ金具であ
る。The cement 94 also serves to transmit the temperature of the fluid to be measured to the thermo unit 90 via the metal tube 93. Therefore, the cement 94 having relatively good thermal conductivity is used. In FIG. 6, reference numeral 97
Is a screw fitting for attaching the temperature sensor 9 to the temperature measuring unit.
【０００６】即ち，上記温度センサ９は，被測温流体を
収容した収容部９８の外壁のねじ穴９８１からその先端
の感温部を挿入し，ネジ金具９７をねじ穴９８１に螺着
して収容部９８に固定する。例えば，エンジンの排気ガ
ス温度を測定する場合には，エンジンの排気管に設けた
ねじ穴から温度センサ９の先端部を挿入し，ネジ金具９
７を排気管のねじ穴に螺着する。That is, in the temperature sensor 9, the temperature sensitive portion at the tip of the temperature sensor 9 is inserted from the screw hole 981 of the outer wall of the storage portion 98 storing the fluid to be measured, and the screw fitting 97 is screwed into the screw hole 981. It is fixed to the accommodation portion 98. For example, when measuring the exhaust gas temperature of the engine, insert the tip of the temperature sensor 9 through the screw hole provided in the exhaust pipe of the engine,
7 is screwed into the screw hole of the exhaust pipe.
【０００７】[0007]
【解決しようとする課題】しかしながら，ネジ金具９７
を用いて被測温流体の収容部の外壁に装着する上記サー
ミスタ温度センサ９には次のような問題がある。即ち，
被測温流体の収容部の内部と外部とには温度差があり，
外部（外気）の温度の影響を受けてサーミスタ温度セン
サに温度エラーが生ずるということである。[Problems to be Solved] However, the screw fitting 97
The thermistor temperature sensor 9 mounted on the outer wall of the storage part for the fluid to be measured using the following has the following problems. That is,
There is a temperature difference between the inside and outside of the storage part of the fluid to be measured,
This means that a temperature error occurs in the thermistor temperature sensor under the influence of the temperature of the outside (outside air).
【０００８】収容部９８内の被測温流体の温度をＴ1 ，
外気温度をＴ2 とすれば，図６に示すネジ金具９７の前
端部９７１の温度は略Ｔ1 ，後端部９７２の温度は略Ｔ
2 となり，ネジ金具９７の前方から後方にかけて温度差
ΔＴが生ずる。The temperature of the fluid to be measured in the accommodating portion 98 is T 1 ,
Assuming that the outside air temperature is T 2 , the temperature of the front end 971 of the screw fitting 97 shown in FIG. 6 is approximately T 1 , and the temperature of the rear end 972 thereof is approximately T 1 .
2 , and a temperature difference ΔT occurs from the front side to the rear side of the screw fitting 97.
【０００９】一方，サーミスタ温度センサを埋設する耐
熱セメントは，サーミスタ温度センサの測定精度と熱応
答を良好にするため熱伝導の高いものが用いられてい
る。そのため，上記温度差ΔＴの温度勾配がサーミスタ
素子に影響し，温度エラーを生ずる。本発明は，かかる
従来のサーミスタ温度センサの問題点に鑑み，被測温流
体と外気との温度差による測定誤差を抑制することので
きるサーミスタ温度センサを提供しようとするものであ
る。On the other hand, as the heat-resistant cement for embedding the thermistor temperature sensor, one having high heat conduction is used in order to improve the measurement accuracy and thermal response of the thermistor temperature sensor. Therefore, the temperature gradient of the temperature difference ΔT affects the thermistor element and causes a temperature error. In view of the problem of the conventional thermistor temperature sensor, the present invention aims to provide a thermistor temperature sensor capable of suppressing a measurement error due to a temperature difference between a fluid to be measured and the outside air.
【００１０】[0010]
【課題の解決手段】本発明は，被測温流体を収容する収
容部に装着し，上記流体の温度を測定するサーミスタ温
度センサであって，該サーミスタ温度センサは，先端部
を閉塞した金属管と，該金属管の前端部に寄せて収容さ
れたサーモユニットと，上記金属管の外周部に取付けら
れ，金属管を上記収容部に設けたねじ穴に挿入螺着する
ネジ金具とを有しており，上記サーモユニットは，リー
ド線を挿通させる絶縁管と，該絶縁管の前端部に固定し
たサーミスタ素子とを有していると共に，その前方部分
が金属管内においてセメントに埋設固定されており，上
記サーモユニットのセメント埋設部は，サーモユニット
の前端から始まり，サーミスタ素子の後端部とネジ金具
の全長の前方２／３の位置との間に及んでいることを特
徴とするサーミスタ温度センサにある。According to the present invention, there is provided a thermistor temperature sensor which is mounted in a storage portion for storing a fluid to be measured and measures the temperature of the fluid, wherein the thermistor temperature sensor is a metal tube having a closed tip. And a thermo unit housed close to the front end of the metal pipe, and a screw fitting attached to the outer periphery of the metal pipe for inserting and screwing the metal pipe into a screw hole provided in the housing. The thermo unit has an insulating tube through which a lead wire is inserted and a thermistor element fixed to the front end of the insulating tube, and the front portion thereof is embedded and fixed in cement in a metal tube. , The thermo-embedded cement portion of the thermo unit starts from the front end of the thermo unit and extends between the rear end of the thermistor element and the front 2/3 position of the entire length of the screw fitting. In the temperature sensor.
【００１１】本発明において特に注目すべきことの第１
点は，サーミスタ温度センサはネジ金具により収容部に
設けたねじ穴に挿入螺着する構造を有することである。
本発明において特に注目すべきことの第２点は，サーモ
ユニットが金属管内にセメントにより埋設固定さている
ことである。The first point of particular interest in the present invention
The point is that the thermistor temperature sensor has a structure in which it is inserted and screwed into a screw hole provided in the accommodating portion with a screw fitting.
The second point to be particularly noted in the present invention is that the thermo unit is embedded and fixed in the metal pipe by cement.
【００１２】そして，本発明において最も注目すべきこ
とは，サーモユニットにおけるセメント埋設部が，サー
モユニットの前端から，サーミスタ素子の後端部とネジ
金具の全長の前方２／３の位置の間にまで及んでいるこ
とである。即ち，セメント埋設部の後端位置は，サーミ
スタ素子の後端部とネジ金具の全長の前方２／３の位置
との間に及んでいる。それ故，少なくともネジ金具の後
方１／３はセメントに埋設されていない。なお，上記に
おいて，ネジ金具の全長とは，ネジ金具の前後長である
（図１のＬ）。What is most noticeable in the present invention is that the cement embedding portion in the thermo unit is located between the front end of the thermo unit, the rear end portion of the thermistor element and the front 2/3 position of the entire length of the screw fitting. It is up to. That is, the rear end position of the cement-buried portion extends between the rear end portion of the thermistor element and the front two-third position of the entire length of the screw fitting. Therefore, at least the rear third of the screw fittings is not buried in cement. In the above description, the total length of the screw fitting is the front-rear length of the screw fitting (L in FIG. 1).
【００１３】[0013]
【作用及び効果】本発明のサーミスタ温度センサのサー
モユニットは，少なくともサーミスタ素子の後端部まで
はセメントに埋設されている。従って，サーミスタ素子
全体はセメントに埋設されており，被測温流体の温度
は，金属管と上記セメントとを経由してサーミスタ素子
に素早く伝達される。また，サーモユニットをセメント
により支持するという強度上の要請からもセメントは，
少なくともサーミスタ素子全体を覆う必要がある。FUNCTION AND EFFECT The thermo unit of the thermistor temperature sensor of the present invention is embedded in cement at least up to the rear end of the thermistor element. Therefore, the entire thermistor element is embedded in the cement, and the temperature of the fluid to be measured is quickly transmitted to the thermistor element via the metal pipe and the cement. Also, due to the strength requirement to support the thermo unit with cement,
It is necessary to cover at least the entire thermistor element.
【００１４】一方，セメントは少なくともネジ金具の後
方１／３には及んでいない。即ち，ネジ金具の後方１／
３より後方のサーモユニットは，熱伝導率の低い空気に
よって覆われている。従って，ネジ金具の後端部（図
６，符号９７２）を被う外気（温度Ｔ2 ）の影響は，検
温素子であるサーミスタ素子には及びにくい。On the other hand, the cement does not reach at least the rear third of the screw fitting. That is, the rear of the screw fitting 1 /
The thermo units located behind 3 are covered with air having low thermal conductivity. Therefore, the influence of the outside air (temperature T 2 ) covering the rear end portion (reference numeral 972 in FIG. 6) of the screw fitting is less likely to affect the thermistor element which is a temperature detecting element.
【００１５】即ち，サーミスタ素子には，金属管とセメ
ントによって被測温流体の温度Ｔ1が応答性良く伝達さ
れるが，外気の影響は，ネジ金具下のサーモユニットを
被う空気に遮られて大幅に抑制される。それ故，被測温
流体と外気との温度差によるサーミスタ温度センサの測
定エラーは大幅に低下する。That is, the temperature T 1 of the fluid to be measured is responsively transmitted to the thermistor element by the metal pipe and the cement, but the influence of the outside air is blocked by the air covering the thermo unit under the screw fitting. Is greatly suppressed. Therefore, the measurement error of the thermistor temperature sensor due to the temperature difference between the fluid to be measured and the outside air is greatly reduced.
【００１６】なお，セメント埋設部の後端部をネジ金具
の全長の２／３以下までとしたのは，セメント埋設部の
後端部がそれ以上長くなると，サーモユニットを被う空
気の外気遮温効果が小さくなり，サーミスタ温度センサ
が外気の影響を受けるようになるからである。上記のよ
うに，本発明によれば，被測温流体と外気との温度差に
よる測定誤差を抑制することのできるサーミスタ温度セ
ンサを提供することができる。The reason why the rear end of the cement-embedded portion is set to be ⅔ or less of the total length of the screw fitting is that when the rear end of the cement-embedded portion becomes longer than that, the outside air of the air covering the thermo unit is shielded. This is because the temperature effect is reduced and the thermistor temperature sensor is affected by the outside air. As described above, according to the present invention, it is possible to provide the thermistor temperature sensor capable of suppressing the measurement error due to the temperature difference between the fluid to be measured and the outside air.
【００１７】[0017]
【実施例】本発明の実施例にかかるサーミスタ温度セン
サについて，図１〜図５を用いて説明する。本例は，エ
ンジンの排気ガス（ＥＧＲガスを含む）の温度を測定す
るサーミスタ温度センサである。本例は，図１に示すよ
うに，被測温流体８０を収容した収容部４０に装着し，
上記流体８０の温度Ｔ1 を測定するサーミスタ温度セン
サ１０である。DESCRIPTION OF THE PREFERRED EMBODIMENTS A thermistor temperature sensor according to an embodiment of the present invention will be described with reference to FIGS. This example is a thermistor temperature sensor that measures the temperature of engine exhaust gas (including EGR gas). In this example, as shown in FIG.
The thermistor temperature sensor 10 measures the temperature T 1 of the fluid 80.
【００１８】サーミスタ温度センサ１０は，先端部を閉
塞した金属管１１と，金属管１１の前端部１１１に寄せ
て収容されたサーモユニット２０と，金属管１１の外周
部１１２に取付けられ，金属管１１を収容部４０に設け
たねじ穴４１に挿入，螺着するネジ金具１２とを有して
いる。The thermistor temperature sensor 10 is attached to the metal pipe 11 whose front end is closed, the thermo unit 20 housed close to the front end 111 of the metal pipe 11, and the outer peripheral portion 112 of the metal pipe 11. 11 has a screw fitting 12 that is inserted into and screwed into a screw hole 41 provided in the accommodating portion 40.
【００１９】サーモユニット２０は，リード線１４を挿
通させる絶縁管２１と，絶縁管２１の前端部に固定した
サーミスタ素子２２とを有している。そして，サーモユ
ニット２０の前方部分は，金属管１１内においてセメン
ト３０に埋設固定されている。The thermo unit 20 has an insulating tube 21 through which the lead wire 14 is inserted and a thermistor element 22 fixed to the front end of the insulating tube 21. The front portion of the thermo unit 20 is embedded and fixed in the cement 30 inside the metal pipe 11.
【００２０】サーモユニット２０のセメント埋設部２３
は，サーモユニット２０の前端２０１から始まる。そし
て，セメント埋設部２３は，サーミスタ素子２２の後端
部２２１と，ネジ金具１２の全長Ｌの前方２／３の位置
との間に及んでいる。被測温流体８０は，エンジンの排
気であり，収容部４０は，エンジンの排気管或いはＥＧ
Ｒガス通路管である。The cement burying portion 23 of the thermo unit 20
Starts from the front end 201 of the thermo unit 20. The cement burying portion 23 extends between the rear end portion 221 of the thermistor element 22 and a position ⅔ in front of the entire length L of the screw fitting 12. The temperature-measurable fluid 80 is the exhaust gas of the engine, and the housing portion 40 is the exhaust pipe of the engine or the EG.
It is an R gas passage pipe.
【００２１】以下それぞれについて詳説する。サーミス
タ温度センサ１０は，図２に示すように，エンジンの排
気管或いはＥＧＲガス通路管のねじ穴４１にネジ金具１
２を螺着して取付けられる。図２において，符号１９
は，ネジ金具１２と収容部４０との間に介設させるガス
ケットである。Each of these will be described in detail below. As shown in FIG. 2, the thermistor temperature sensor 10 includes a screw fitting 1 in a screw hole 41 of an engine exhaust pipe or an EGR gas passage pipe.
2 can be attached by screwing. In FIG. 2, reference numeral 19
Is a gasket interposed between the screw fitting 12 and the accommodating portion 40.
【００２２】サーミスタ温度センサ１０は，図１に示す
ように，サーモユニット２０が金属管１１内に収容され
ており，金属管１１の前端部１１１に接するよう検温素
子であるサーミスタ素子２２が配設されている。上記サ
ーモユニット２０は，次のような工程により，金属管１
１に固定される。In the thermistor temperature sensor 10, as shown in FIG. 1, a thermo unit 20 is housed in a metal tube 11, and a thermistor element 22 which is a temperature detecting element is arranged so as to be in contact with a front end portion 111 of the metal tube 11. Has been done. The thermo unit 20 is manufactured by the following process.
It is fixed at 1.
【００２３】最初にＭｇＯ系セメントを水と混合し泥状
化する。そして，泥状化したセメント３０を所定量だけ
ディスペンサ等を用いて，金属管１１の前端部１１１に
注入する。上記ディスペンサは，注射針状のパイプを備
えた注入器である。続いて，サーモユニット２０を，そ
の先端が金属管１１に突き当たるまで，上記セメント３
０部に真直ぐに挿入する。First, MgO-based cement is mixed with water to form a mud. Then, a predetermined amount of the muddy cement 30 is injected into the front end portion 111 of the metal pipe 11 by using a dispenser or the like. The dispenser is an injector having a needle-like pipe. Then, the thermo unit 20 is replaced with the cement 3 until the tip of the thermo unit 20 hits the metal pipe 11.
Insert straight into copy 0.
【００２４】サーモユニット２０の挿入に伴いセメント
３０は，後方に押し出され，サーモユニット２０の外周
と金属管１１の内壁との隙間を這い上がる。その結果，
サーモユニット２０の前方には，セメント３０に被われ
たセメント埋設部２３が形成される。その後，常温〜２
００℃の温度でセメント３０を乾燥，硬化させて，サー
モユニット２０を金属管１１に固定する。With the insertion of the thermo unit 20, the cement 30 is pushed out backward and creeps up the gap between the outer periphery of the thermo unit 20 and the inner wall of the metal tube 11. as a result,
In front of the thermo unit 20, a cement embedding portion 23 covered with cement 30 is formed. After that, room temperature to 2
The cement 30 is dried and hardened at a temperature of 00 ° C. to fix the thermo unit 20 to the metal tube 11.
【００２５】サーモユニット２０は，図３に示すよう
に，絶縁管２１の前端にサーミスタ素子２２が取付けら
れている。このサーミスタ素子２２は，ガラス２２１に
封入された抵抗素子２２２からなる検出部２２ａと，こ
の検出部２２ａを保持する絶縁管２２ｂとからなる。絶
縁管２１には，サーミスタ素子２２のリード線１４を挿
通するリード穴２１１が穿設されている。リード線１４
は接着剤２１２によって，リード穴２１１に固定され
る。更に絶縁管２２ｂの後端と絶縁管２１の前端とは，
接着剤２１３によって固定される。なお，絶縁管２１
は，マグネシア系のセラミックで形成された絶縁管であ
る。As shown in FIG. 3, the thermo unit 20 has a thermistor element 22 attached to the front end of an insulating tube 21. The thermistor element 22 is composed of a detection section 22a composed of a resistance element 222 enclosed in glass 221, and an insulating tube 22b holding the detection section 22a. The insulating tube 21 is provided with a lead hole 211 through which the lead wire 14 of the thermistor element 22 is inserted. Lead wire 14
Is fixed to the lead hole 211 with an adhesive 212. Further, the rear end of the insulating tube 22b and the front end of the insulating tube 21 are
It is fixed by the adhesive 213. Insulation tube 21
Is an insulating tube made of magnesia ceramic.
【００２６】サーミスタ素子２２は，ガラスによってサ
ーミスタを封止したものであり，接着剤２１２により絶
縁管２１に取付けられる。サーミスタ素子２２の全長は
約４ｍｍである。そして，図１に示すように，絶縁管２
１の後方から引出されたリード線１４は，被覆を有する
リードワイヤ１５と接続され，リードワイヤ１５は，サ
ーミスタ温度センサ１０の後方から外部に引き出され
る。The thermistor element 22 is a thermistor sealed with glass, and is attached to the insulating tube 21 with an adhesive 212. The total length of the thermistor element 22 is about 4 mm. Then, as shown in FIG.
The lead wire 14 drawn out from the rear side of 1 is connected to the lead wire 15 having a coating, and the lead wire 15 is drawn out from the rear side of the thermistor temperature sensor 10.
【００２７】リードワイヤ１５の引き出し部は，ゴムブ
ッシュ１６と保護チューブ１８を介設させて，金属管１
１をかしめて封止される。一方，金属管１１の先端から
約５ｍｍの位置には，ネジ金具１２が金属管１１の外周
にろう付けされる。The lead-out portion of the lead wire 15 is provided with a rubber bush 16 and a protective tube 18, and the metal tube 1
1 is crimped and sealed. On the other hand, a screw fitting 12 is brazed to the outer periphery of the metal tube 11 at a position approximately 5 mm from the tip of the metal tube 11.
【００２８】上記ネジ金具１２の全長Ｌは，約１５ｍｍ
である。そして，サーモユニット２０のセメント埋設部
２３の後端位置は，サーミスタ素子２２の後端部２２１
と，ネジ金具１２の前方から２／３（約１０ｍｍ）の位
置との間にある。The total length L of the screw fitting 12 is about 15 mm.
Is. The rear end position of the cement embedding portion 23 of the thermo unit 20 is the rear end portion 221 of the thermistor element 22.
And a position of 2/3 (about 10 mm) from the front of the screw fitting 12.
【００２９】次に，本例のサーミスタ温度センサ１０の
作用効果ついて述べる。サーミスタ温度センサ１０の検
温部であるサーミスタ素子２２は，セメント３０に埋設
されている。従って，図２に示すように，サーミスタ温
度センサ１０を排気管に装着した場合，被測温流体８０
である排気ガスの温度Ｔ1 は，金属管１１とセメント３
０を経て素早くサーミスタ素子２２に伝達される。なぜ
ならば，金属管１１とセメント３０とは，共に熱的な良
導体であるからである。Next, the function and effect of the thermistor temperature sensor 10 of this example will be described. The thermistor element 22, which is the temperature measuring portion of the thermistor temperature sensor 10, is embedded in the cement 30. Therefore, as shown in FIG. 2, when the thermistor temperature sensor 10 is attached to the exhaust pipe, the fluid to be measured 80
The temperature T 1 of the exhaust gas, which is
It is rapidly transmitted to the thermistor element 22 via 0. This is because the metal pipe 11 and the cement 30 are both good thermal conductors.
【００３０】一方，ネジ金具１２を経由した外気温度Ｔ
2 の影響は，ネジ金具１２下においてサーモユニット２
０の外周を被う空気８１によって抑制される。空気８１
は熱的な不良導体であり，ネジ金具１２後端部１２２に
おける外気温度Ｔ2 は，これによってサーモユニット２
０に伝わりにくくなるからである。On the other hand, the outside air temperature T passing through the screw fitting 12
The effect of 2 is that the thermo unit 2
It is suppressed by the air 81 covering the outer periphery of zero. Air 81
Is a thermally defective conductor, and the outside air temperature T 2 at the rear end 122 of the screw fitting 12 is
This is because it is difficult to reach 0.
【００３１】図４は，セメント埋設部２３の後端部の位
置を変化させてサーミスタ温度センサ１０の温度変化を
測定した特性図である。即ち，図５に示すように，セメ
ント埋設部２３の後端位置２３１を，ネジ金具１２の前
端（ｘ＝０）から，後端（ｘ＝１５ｍｍ）まで変化させ
る。図４はこのときのサーミスタ温度センサ１０の測定
値の変化を示すものである。FIG. 4 is a characteristic diagram in which the temperature change of the thermistor temperature sensor 10 is measured by changing the position of the rear end portion of the cement embedding portion 23. That is, as shown in FIG. 5, the rear end position 231 of the cement embedding portion 23 is changed from the front end (x = 0) of the screw fitting 12 to the rear end (x = 15 mm). FIG. 4 shows changes in the measured value of the thermistor temperature sensor 10 at this time.
【００３２】図４において，点Ａはサーミスタ温度セン
サ１０の許容精度の限界を示す点であり，同図から知ら
れるように，セメント埋設部２３の後端位置２３１が，
ネジ金具１２の２／３以下（ｘ≦１０）のときは上記許
容精度を充分に満足する。なお，測定カーブ５１（実
線）と５２（破線）とは，セメント３０の熱伝導率を変
えたときの特性カーブである。In FIG. 4, point A is a point indicating the limit of allowable accuracy of the thermistor temperature sensor 10. As is known from the figure, the rear end position 231 of the cement burying portion 23 is
When ⅔ or less (x ≦ 10) of the screw fitting 12, the above allowable accuracy is sufficiently satisfied. The measurement curves 51 (solid line) and 52 (broken line) are characteristic curves when the thermal conductivity of the cement 30 is changed.
【００３３】上記カーブ５１（高伝導率），５２（低伝
導率）の差から知られるように，セメントの熱伝導率の
差は，セメント埋設部２３の長短差に比べると影響度は
少ない。上記のように，本例によれば，被測温流体８０
と外気との温度差による測定誤差を抑制することのでき
るサーミスタ温度センサ１０を提供することができる。As is known from the difference between the curves 51 (high conductivity) and 52 (low conductivity), the difference in the thermal conductivity of the cement has less influence than the difference in the length of the cement burying portion 23. As described above, according to this example, the fluid to be measured 80
It is possible to provide the thermistor temperature sensor 10 that can suppress the measurement error due to the temperature difference between the thermistor and the outside air.
【図１】実施例のサーミスタ温度センサの断面図。FIG. 1 is a sectional view of a thermistor temperature sensor according to an embodiment.
【図２】実施例のサーミスタ温度センサの装着状態断面
図。FIG. 2 is a sectional view of the thermistor temperature sensor according to the embodiment in a mounted state.
【図３】実施例のサーモユニットの断面図。FIG. 3 is a cross-sectional view of the thermo unit of the embodiment.
【図４】実施例のサーミスタ温度センサにおいてセメン
ト埋設部の後端位置ｘを変化させたときの特性変化図。FIG. 4 is a characteristic change diagram when the rear end position x of the cement embedded portion is changed in the thermistor temperature sensor of the embodiment.
【図５】図４におけるセメント埋設部の後端位置ｘの説
明図。5 is an explanatory view of a rear end position x of the cement burying portion in FIG.
【図６】従来のサーミスタ温度センサの断面図。FIG. 6 is a sectional view of a conventional thermistor temperature sensor.
１０．．．サーミスタ温度センサ， １１．．．金属管， １２．．．ネジ金具， ２０．．．サーモユニット， ２１．．．絶縁管， ２２．．．サーミスタ素子， ２２１．．．後端部， ２３．．．セメント埋設部， ２３１．．．後端位置， ３０．．．セメント， ４０．．．収容部， ４１．．．ねじ穴， ８０．．．被測温流体， 10. ． ． Thermistor temperature sensor, 11. ． ． Metal tube, 12. ． ． Screw fittings, 20. ． ． Thermo unit, 21. ． ． Insulating tube, 22. ． ． Thermistor element, 221. ． ． Rear end, 23. ． ． Cement burying section, 231. ． ． Rear end position, 30. ． ． Cement, 40. ． ． Storage part, 41. ． ． Screw holes, 80. ． ． Fluid to be measured,
Claims (2)
上記流体の温度を測定するサーミスタ温度センサであっ
て，該サーミスタ温度センサは，先端部を閉塞した金属
管と，該金属管の前端部に寄せて収容されたサーモユニ
ットと，上記金属管の外周部に取付けられ，金属管を上
記収容部に設けたねじ穴に挿入螺着するネジ金具とを有
しており，上記サーモユニットは，リード線を挿通させ
る絶縁管と，該絶縁管の前端部に固定したサーミスタ素
子とを有していると共に，その前方部分が金属管内にお
いてセメントに埋設固定されており，上記サーモユニッ
トのセメント埋設部は，サーモユニットの前端から始ま
り，サーミスタ素子の後端部とネジ金具の全長の前方２
／３の位置との間に及んでいることを特徴とするサーミ
スタ温度センサ。1. A mounting part for accommodating a fluid to be measured,
A thermistor temperature sensor for measuring the temperature of the fluid, wherein the thermistor temperature sensor includes a metal tube having a closed tip, a thermo unit housed near the front end of the metal tube, and an outer periphery of the metal tube. And a metal fitting for inserting and screwing a metal tube into a threaded hole provided in the accommodating portion, the thermo unit includes an insulating tube through which a lead wire is inserted, and a front end portion of the insulating tube. And a front portion of the thermistor element is fixed to the cement by embedding and fixing it in a metal pipe. And the front of the total length of the screw fittings 2
A thermistor temperature sensor, characterized in that it extends to the position of / 3.
ンの排気であり，上記収容部はエンジンの排気管或いは
ＥＧＲガス通路管であることを特徴とするサーミスタ温
度センサ。2. The thermistor temperature sensor according to claim 1, wherein the temperature-measurable fluid is engine exhaust, and the accommodating portion is an engine exhaust pipe or an EGR gas passage pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20576393A JP3296034B2 (en) | 1993-07-27 | 1993-07-27 | Thermistor temperature sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20576393A JP3296034B2 (en) | 1993-07-27 | 1993-07-27 | Thermistor temperature sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0743220A true JPH0743220A (en) | 1995-02-14 |
| JP3296034B2 JP3296034B2 (en) | 2002-06-24 |
Family
ID=16512268
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20576393A Expired - Lifetime JP3296034B2 (en) | 1993-07-27 | 1993-07-27 | Thermistor temperature sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3296034B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7507024B2 (en) | 2005-11-09 | 2009-03-24 | Denso Corporation | Temperature sensor |
| CN101995305A (en) * | 2009-08-24 | 2011-03-30 | 三菱综合材料株式会社 | Temperature sensor |
| KR20150039770A (en) | 2012-08-03 | 2015-04-13 | 세미텍 가부시키가이샤 | Contact-type infrared temperature sensor, thermal apparatus, and exhaust system |
-
1993
- 1993-07-27 JP JP20576393A patent/JP3296034B2/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7507024B2 (en) | 2005-11-09 | 2009-03-24 | Denso Corporation | Temperature sensor |
| CN101995305A (en) * | 2009-08-24 | 2011-03-30 | 三菱综合材料株式会社 | Temperature sensor |
| KR20150039770A (en) | 2012-08-03 | 2015-04-13 | 세미텍 가부시키가이샤 | Contact-type infrared temperature sensor, thermal apparatus, and exhaust system |
| US9273586B2 (en) | 2012-08-03 | 2016-03-01 | Semitec Corporation | Contact-type infrared temperature sensor for high temperature measurement, thermal apparatus, and exhaust system |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3296034B2 (en) | 2002-06-24 |
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