FR2551208A1 - Thermoelectric torque - Google Patents

Thermoelectric torque Download PDF

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Publication number
FR2551208A1
FR2551208A1 FR8412426A FR8412426A FR2551208A1 FR 2551208 A1 FR2551208 A1 FR 2551208A1 FR 8412426 A FR8412426 A FR 8412426A FR 8412426 A FR8412426 A FR 8412426A FR 2551208 A1 FR2551208 A1 FR 2551208A1
Authority
FR
France
Prior art keywords
plate
characterized
thermocouple
sleeve
body
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
Application number
FR8412426A
Other languages
French (fr)
Other versions
FR2551208B1 (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
HEHL KARL
Original Assignee
HEHL KARL
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to DE3330491A priority Critical patent/DE3330491C2/de
Application filed by HEHL KARL filed Critical HEHL KARL
Publication of FR2551208A1 publication Critical patent/FR2551208A1/en
Application granted granted Critical
Publication of FR2551208B1 publication Critical patent/FR2551208B1/en
Application status is Expired legal-status Critical

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01KMEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K7/00Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply, e.g. by thermoelectric elements
    • G01K7/02Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply, e.g. by thermoelectric elements using thermoelectric elements, e.g. thermocouples
    • G01K7/04Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply, e.g. by thermoelectric elements using thermoelectric elements, e.g. thermocouples the object to be measured not forming one of the thermo-electric materials
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01KMEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K1/00Details of thermometers not specially adapted for particular types of thermometer
    • G01K1/16Special arrangements for conducting heat from the object to the sensitive element
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01KMEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K1/00Details of thermometers not specially adapted for particular types of thermometer
    • G01K1/16Special arrangements for conducting heat from the object to the sensitive element
    • G01K1/18Special arrangements for conducting heat from the object to the sensitive element for reducing thermal inertia

Abstract

THE INVENTION CONCERNS A THERMOELECTRIC COUPLE, IN WHICH THE END OF THE THREADS 13A, 13B FORMING THE TORQUE AND ENVELOPED BY A REFRACTORY SOCKET 16 ARE FOUNDED IN A BODY IN MISCHMETALL 13M. THIS BODY IS EMITTED INTO THE AXIS OF A CONCENTRIC EVIDENCE 21 OF A HEAT CONDUCTIVE PLATE 17. THE EXTERNAL FACE OF THE PLATE 17, WHICH EXCEEDS THE SOCKET 16 FRONTAL SIDE, IS IN THE THERMAL CONTACT OF A METAL HOUSING ELEMENT 16 HEAT CONDUCTOR, AXIALLY MAINTAINING THE SLEEVE 16 AND THE PLATE 17 ABOVE. </ P> <P> SUCH A STRUCTURE CREATES THE CONDITIONS PRECEDENT TO MANUFACTURE IN RATIONAL SERIES, WITH PRECISION OF MEASUREMENT AND HIGH PARALLEL REACTION SPEED.

Description

Thermoelectric torque.

  The present invention relates to a thermoelectric pair composed of two wires of different materials, iron and Cons5 tantan for example, housed without traction force in a protective sleeve, connected to a first end (heated joint) to form the couple and wrapped by a socket made of refractory material in the area of at least the heated joint, a voltmeter connected to the other end (cold solder) of the wires, and a metal heat conductive plate which bears in the axis of the socket that it exceeds the front side, in which the ends

  wires are coated and whose front face is in thermal contact with an equally conductive metal housing which axially holds the aforesaid bushing and plate.

  On an already known thermocouple of the type previously described (US Pat. No. 2,517,033) the ends of the wires exposed, stripped and enveloped by the socket are cast in a solder flux or other suitable metal alloy and thus electrically connected when the flux or the alloy are cast, the socket covered at its bottom

  by a washer of mica serves as a kind of mold.

  The metal alloy cast body, with a symmetry of revolution, has at its lower end a radial flange. It thus serves in the heat-conducting plate system. The thermocouple obtained thus has a precautionary character.

  Measuring range and high reaction rate The required casting operation, however, prevents rational series production.

  The present invention aims at improving a thermoelectric torque of the type previously described so that it responds, in measurement accuracy and speed of reaction, to all the requirements imposed by the practice,

  without significant additional cost of manufacture.

  According to an essential characteristic of the invention, a

  Mischmetall body formed by fusion of the wires is recessed, at the location of the heated joint, in the axis of a concentric recess of the heat conductive plate.

  To further increase the measurement accuracy, it is possible to isolate the heated joint from certain electrical disturbance potentials, without impairing the heat conduction between the object and the measuring point, by inserting an electrically insulating washer, Preferably, a high diathermane mica washer between the front face of the conductive plate and the pot-shaped heat conductive casing. This possibility reduces the mass production costs since the mica washer is inserted. qu'en'fonction

  requirements, that is to say only for those customers who require extremely high measurement accuracy of the device.

  Serious rationalization of the mass production is obtained by the following measurement: the component formed by the conductive plate with its centering sleeve, the Mischmetall body and the wires, is embedded in the refractory injection-molded high polymer part. being

inserted into the mold.

  This measure simplifies the method of manufacture, the heat conductive plate having the body in Mischmetall being embedded in the sleeve 16 during an injection molding operation, the same sleeve

  being clamped by cold crimping of the driver's boatier.

  The invention will be better understood with the aid of the construction examples illustrated in the accompanying drawings, which represent: FIG. 1: a partial section of the thermocouple inserted into the pre-plasticization pot of a plastic injection machine, FIG. enlarged view of a partial longitudinal sectional view of the thermocouple, FIG. 3: the protective sleeve not yet formed of the thermocouple, FIGS. 4, 5, 6: the ceramic sleeve constituting the socket; the heat conducting plate and the mica washer of the thermocouple,

  Figure 7: The thermally conductive housing, not yet formed, of the thermocouple.

  In the construction example shown in the drawings, the torque of the thermoelectric element is formed by two wires 13a ', 13b' made of iron and Constantan, housed without traction force in a protective sleeve 15. welded at one end (heated seal) and wrapped by a thermostable socket 16 in the area of the measuring point The voltmeter is connected to the other end of these wires 13a ', 13b' (cold seam) At the location of the With a heated joint, a 13 m Mischmetoll body, obtained by melting the wires 13 ', 13' and alloying metals, is embedded in a metal heat conducting plate 17,

  machined from aluminum or beryllium copper alloy.

  The wires are arc-welded in an inert atmosphere, thus without oxygen. Any oxidation phenomenon is therefore excluded.

  The resulting Mischmetall body, perfectly alloyed, is almost ellipsoid-shaped.

  The conductive plate 17 rests in the axis of the bushing 16, which it exceeds on the front side. Its outer face is in thermal contact with a heat-conducting housing 18, which ensures its axial retention and that of the ceramic bushing. This same plate 17, radially symmetrical, is provided in a section of inner diameter aa which is greater and centered on an internal annular shoulder 16a of the aforesaid bush. The shoulder 16a, perpendicular to the axis of symmetry of the thermocouple, closes rear side an annular space 22a, whose outer and inner limits are respectively represented by the inner casing of the ceramic sleeve 16 and the periphery of the conductive plate 17 The body in Mischmetall 13 has almost the shape of a It is pushed into a concentric recess and conical plate 17, forming two annular contact surfaces y, z This same body 13 m is retained in the recess 21 by throttling 17 a 'of a rear centering sleeve 17a of the plate 17 A second throat 17a' 'of the aforesaid sleeve 17a ensures the strain relief of the sheathed wires 13a, 13b The protective sheath 13 of the thermocouple is furthermore relieved in tension by a constriction 15b 'of the sleeve 15 The three constrictions 17a', 17a '' and 15b 'are made by cold forming of the centering sleeve 17a

  and / or protection 15 The rear section 15b of the latter sleeve 15 thus has a relatively thin wall.

  The diameter of the conductive plate 17 is at least three times greater than the maximum diameter of the Misch35 metall body 13 m, but less than the maximum internal diameter aa of the ceramic sleeve 16 This measurement makes it possible to obtain an intense heat conduction between the object to be measured,

  pre-plasticization pot for example, and the measuring point.

  Between the front face of the conductive plate 17 and the pot-shaped conductor housing 18, it is possible to insert an electrically insulating washer 20, preferably a high diathermane mica washer, which protrudes radially and from all sides. The insertion of this mica washer makes it possible to isolate the heated joint from the electrical potentials of the object to be measured, thus satisfying the highest requirements for precision.

measurement.

  As shown in FIG. 1, the flat front face S of the pot-shaped heat conducting housing 18 is in contact with the object 10 under the load of a spiral spring 12 enveloping the thermocouple; the two ends of this spring 12 are respectively based on the internal fold 18 a of the

  The initial tension of this same spring 12, which determines the bearing pressure of the end face S, can be adjusted by means of a threaded bushing 11, whose threading 11a and the tapping are respectively engaged with the object 10 and the spiral spring 12.

  This bushing 11, whose threaded portion 11a enters the bore 19 of the object 10, ends at the rear side with a

six sides 11 b.

  The thermocouple structure may have a variant not shown in the drawings, of which it is distinguished as follows: The ceramic bushing 16 and the protective sleeve 15 are replaced by a refractory high polymer injection molded part, the external diameter of which is equal to that 35 of the sleeve 16 in the section of the heated joint and which also has the shape of the protective sleeve 15. The component formed by the conductive plate 17 with its centering sleeve 17a, the body in Mischmetall 13 m and the wires 13a ', 13b' is embedded in this piece The coating is provided in the cavity of an injection mold, during the corresponding operation The molded part, with radial symmetry, present at the end rear of the heated seal an outer annular shoulder, which corresponds to the outer flange 15a of the protective sleeve 15 on the construction example illustrated by the drawings; The internal section 18a of cold-formed boltier 18 The end section of the protective sheath 13 of the thermocouple is embedded in a rear section of the workpiece protruding from the housing 18 With this

  variant, it is therefore unnecessary to provide a special assembly of the sockets 15 and 16.

  The possible insertion of the mica washer and the mounting of the conductive casing 18 correspond to the manufacturing method of the example shown in the drawings; indeed, the front face of the conductive plate 17 embedded in the molded part exceeds the latter in the same manner as in the aforementioned construction example.

Claims (8)

Claims.
  1 Thermoelectric pair composed of two wires of different materials, iron and Constantan for example, housed without traction force in a protective sleeve, connected to a first end (heated joint) to form the torque and wrapped by a sleeve of refractory material in the area of the heated joint at least, a voltmeter connected to the other end (cold junction) of the wires, as well as a metal-heat conductive plate which rests in the axis of the bushing (16 ) it protrudes from the front side, in which the ends of the wires are encapsulated and whose end face is in thermal contact with an equally conductive metal housing (18), which axially holds the bushing (16) and the plate ( 17),
  characterized in that a Mischmetall body (13 m) formed by fusion of the wires (13 a ', 13 b') is recessed, at the location of the heated joint, in the axis of a concentric recess (21). of the heat conducting plate (17).
  Thermocouple according to Claim 1, characterized in that the Mischmetall body (13 m), which has approximately the shape of an ellipsoid, is fitted into a conical recess (21) of the conductive plate (17). centered on an inner annular shoulder (16a) of the bushing (16), forming two annular contact surfaces (y, z)
  Thermocouple according to one of claims 1 and 2, characterized in that the body in Mischmetall (13 m)
  is retained in the recess (21) by throttling (17 a ')
  a rear centering sleeve (17a) of the plate (17), another constriction (17a ") providing traction relief of the sheathed son (13a, 13b).
  Thermocouple according to one of the preceding claims, characterized in that the diameter
  the heat conducting plate (17) is at least three times higher than the maximum diameter of the body in Mischmetall (13 m), but smaller than the inside diameter (a a)
of the socket (16).
  Thermoelectric torque according to any one of the preceding claims, characterized by the possibility of insertion of an electrically insulating washer (20),
  preferably a high diathermy mica washer, between the front face of the conductive plate (17) and the pot-shaped conductor housing (18), this washer
  (20) protruding radially and on all sides the flat front face of the plate (17).
  Thermocouple according to any one of the preceding claims, characterized in that the planar end face (S) of the heat conducting housing (18) is in contact with the object to be measured (10) under the load of a
  spiral spring (12) enclosing the thermocouple, the two ends of this spring (12) bearing respectively on an inner fold (18 a) of the housing (18) and on the plug (14), and in that the prestressing axial axis of the same spiral spring (12) can be adjusted by means of a threaded bushing (11), whose thread (11 a ') and the thread are respectively engaged with the object (10) and the spiral spring
(12).
  Thermocouple according to any one of the preceding claims, characterized in that the bushing (16) is a ceramic bushing whose backside supports
  a coaxial protective sleeve (15), enclosed by an internal fold (18 a) of the housing (18) and whose constriction (15 b ') relieves the thermocouple protective sheath (13) in tension.
  Thermocouple pair according to one of Claims 1 to 6, characterized in that the formed component
  by the conductive plate (17) with its centering sleeve (17a), the Mischmetall body (13m) and the wires (13a ', 13b') is embedded in the refractory high polymer sleeve
  injection molded by being inserted into the mold.
  Thermocouple according to Claim 8, characterized in that the sleeve has, at the rear end of the heated joint, an annular shoulder encircled by an internal fold (18 a) of the conductive housing (18), and that the end section of the protective sheath (13)
  wires (13a, 13b) are embedded in the socket.
FR8412426A 1983-08-24 1984-08-06 thermoelectric couple Expired FR2551208B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE3330491A DE3330491C2 (en) 1983-08-24 1983-08-24

Publications (2)

Publication Number Publication Date
FR2551208A1 true FR2551208A1 (en) 1985-03-01
FR2551208B1 FR2551208B1 (en) 1988-10-28

Family

ID=6207299

Family Applications (1)

Application Number Title Priority Date Filing Date
FR8412426A Expired FR2551208B1 (en) 1983-08-24 1984-08-06 thermoelectric couple

Country Status (6)

Country Link
CH (1) CH666355A5 (en)
DE (1) DE3330491C2 (en)
FR (1) FR2551208B1 (en)
GB (1) GB2147737B (en)
IT (1) IT1180283B (en)
NL (1) NL8402450A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0658752A1 (en) * 1993-12-15 1995-06-21 MANNESMANN Aktiengesellschaft Temperature measuring device
EP0710824A1 (en) * 1994-11-05 1996-05-08 Elth S.A. Thermal sensor
FR2793557A1 (en) * 1999-05-14 2000-11-17 Sc2N Sa Temperature sensor especially for fitting into blind hole in IC engine housing has thermo-sensory transducer, fixing and spring between it and inner body
EP3264059A1 (en) * 2016-06-27 2018-01-03 MEAS France Temperature sensor with heat transfer element and fabrication method

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010063062A1 (en) 2010-12-14 2012-06-14 Endress + Hauser Wetzer Gmbh + Co. Kg Protective tube inner part of a thermometer with a protective tube
DE102011089942A1 (en) 2011-12-27 2013-06-27 Endress + Hauser Wetzer Gmbh + Co. Kg Receiving device for measuring insert, has mold portion for fastening receiving device to pipeline, where mold portion has bore, in which component is inserted from end of bore
DE102012112579A1 (en) 2012-12-18 2014-06-18 Endress + Hauser Wetzer Gmbh + Co Kg Receiving device, particularly protective tube, for measuring insert, particularly for determining temperature of measuring material in process container, has two sections, which are separated from each other through passage
CN105424209B (en) * 2015-12-04 2019-03-05 广州泰鼎电气有限公司 A kind of sensor of direct contact measurement high voltage object temperature

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2517033A (en) * 1948-11-15 1950-08-01 Bristol Company Thermocouple structure
US2530256A (en) * 1945-06-09 1950-11-14 Honeywell Regulator Co Thermoelectric generator
DE1473298A1 (en) * 1963-12-19 1969-03-27 Metrawatt Ag RTD
DE1648188A1 (en) * 1967-09-12 1971-05-27 Braun Ag Illegal probe for contact thermometer
DE2806193A1 (en) * 1978-02-14 1979-08-16 Bosch Siemens Hausgeraete Temp. sensor for domestic heating appliances and cookers - has pair of thermal leads connected to measuring point by disc and protected by conduit and insulating sleeve
GB2127215A (en) * 1982-09-08 1984-04-04 Servo Corp Of America Heat sensing device

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2511033A (en) * 1948-10-29 1950-06-13 Balch Pneumatic conveyer
US3468723A (en) * 1966-11-21 1969-09-23 Thermo Electric Co Inc Spring-loaded thermocouple

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2530256A (en) * 1945-06-09 1950-11-14 Honeywell Regulator Co Thermoelectric generator
US2517033A (en) * 1948-11-15 1950-08-01 Bristol Company Thermocouple structure
DE1473298A1 (en) * 1963-12-19 1969-03-27 Metrawatt Ag RTD
DE1648188A1 (en) * 1967-09-12 1971-05-27 Braun Ag Illegal probe for contact thermometer
DE2806193A1 (en) * 1978-02-14 1979-08-16 Bosch Siemens Hausgeraete Temp. sensor for domestic heating appliances and cookers - has pair of thermal leads connected to measuring point by disc and protected by conduit and insulating sleeve
GB2127215A (en) * 1982-09-08 1984-04-04 Servo Corp Of America Heat sensing device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0658752A1 (en) * 1993-12-15 1995-06-21 MANNESMANN Aktiengesellschaft Temperature measuring device
EP0710824A1 (en) * 1994-11-05 1996-05-08 Elth S.A. Thermal sensor
FR2793557A1 (en) * 1999-05-14 2000-11-17 Sc2N Sa Temperature sensor especially for fitting into blind hole in IC engine housing has thermo-sensory transducer, fixing and spring between it and inner body
EP3264059A1 (en) * 2016-06-27 2018-01-03 MEAS France Temperature sensor with heat transfer element and fabrication method

Also Published As

Publication number Publication date
NL8402450A (en) 1985-03-18
FR2551208B1 (en) 1988-10-28
GB8420511D0 (en) 1984-09-19
IT8404855D0 (en) 1984-08-24
GB2147737A (en) 1985-05-15
IT1180283B (en) 1987-09-23
DE3330491C2 (en) 1986-01-30
DE3330491A1 (en) 1985-03-14
GB2147737B (en) 1987-02-25
CH666355A5 (en) 1988-07-15

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