Calibrator sleeve and block calibrator for calibration of a temperature sensor

Abstract

A block calibrator for calibrating a temperature sensor includes a calibrator sleeve having at least one sensor bore into which the temperature sensor is insertable along a longitudinal direction. The calibration sleeve also includes a body having at least two sections having different thermal conductivities.

Claims

1. A calibrator sleeve for a block calibrator for calibrating a temperature sensor, comprising: a body having a first section and at least one second section, the first section having a higher thermal conductivity than the at least one second section, the first section forming a calibration section, the at least one second section adjoining the calibration section in a longitudinal direction and forming at least one connecting section; and at least one sensor bore disposed within the body into which the temperature sensor is insertable along the longitudinal direction.

2. A calibrator sleeve in accordance with claim 1, wherein the first section comprises a material of a first thermal conductivity and the at least one second section comprises a material of a second thermal conductivity.

3. A calibrator sleeve in accordance with claim 2, wherein the material forming the calibration section comprises aluminum and/or aluminum alloys and/or copper and the material of the at least one connecting section at least partially comprises steel and/or stainless steel.

4. A calibrator sleeve in accordance with claim 1, wherein the at least one connecting section of the calibrator sleeve comprises at least one cut-out that is filled with air or evacuated.

5. A calibrator sleeve in accordance with claim 1, wherein a section having a lower thermal conductivity than the first section is formed at both sides of the calibration section with respect to the longitudinal direction of the calibrator sleeve.

6. A calibrator sleeve in accordance with claim 1, wherein the body of the calibrator sleeve is cylindrical and has a smaller diameter in the calibration section than in the at least one connecting section.

7. A calibrator sleeve in accordance with claim 1, wherein the calibration section and the at least one connecting section are connected to one another by means of a threaded connection or by means of an interference fit assembly.

8. A calibrator sleeve in accordance with claim 2, wherein the calibration section and the at least one connecting section are connected to one another by means of at least one screw element or by means of a plastically deformed material section of at least one of the materials.

9. A block calibrator for calibrating a temperature sensor, comprising: a heating block having a reception hole for receiving a calibrator sleeve; at least one heater is arranged at or in the heating block; the calibrator sleeve having at least one sensor bore into which the temperature sensor is insertable along a longitudinal direction, the calibrator sleeve having a body, the body having a first section and at least one second section, the first section having a higher thermal conductivity than the at least one second section, the first section forming a calibration section, the at least one second section adjoining the calibration section in a longitudinal direction and forming at least one connecting section.

10. A block calibrator in accordance with claim 9, wherein with the calibrator sleeve inserted into the reception hole, the calibration section corresponds to an arrangement of a heater with respect to the longitudinal direction.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a total view of a block calibrator comprising a calibrator sleeve configured in accordance with the invention;

(2) FIG. 2 is a calibrator sleeve with a screw connection between a calibration section and a connecting section;

(3) FIG. 3 is a calibrator sleeve with an interference fit assembly between the calibration section and the connecting section;

(4) FIG. 4 is a calibrator sleeve with a plastically deformed material region for forming a shape match between the calibration section and the connecting section;

(5) FIG. 5 is a calibrator sleeve with a screw element for connecting the calibration section and the connecting section;

(6) FIG. 6 is a further embodiment of a calibrator sleeve with connecting sections arranged at both sides of the calibration section; and

(7) FIG. 7 is a further embodiment of a calibrator sleeve having plate elements for forming connecting sections.

DETAILED DESCRIPTION OF THE DRAWINGS

(8) FIG. 1 shows a block calibrator 100 in a cross-section in a schematized representation. The block calibrator 100 has a heating block 19 as a base body and a reception hole 21 into which a calibrator sleeve 1 is inserted is introduced in the heating block 19. The reception hole 21 is configured as a bore, without the manufacture of the reception hole 21 having to be produced by means of a drilling process, and the reception hole 21 has a base region that terminates the reception hole 21 downwardly in a longitudinal direction L of the reception hole 21. The calibrator sleeve 1 is inserted into the reception hole 21 such that the former stands up at the base side or is held spaced apart from the base surface by corresponding means. The same applies in the radial direction so that only by way of example a peripheral gap is shown between the calibrator sleeve 1 and the reception hole 21.

(9) The embodiment shows the calibrator sleeve 1 in a cylindrical shape and, starting from the upper side, two sensor bores 11 are introduced into the calibrator sleeve 1, with a temperature sensor 10 being inserted in the left sensor bore 11. A reference sensor, not shown, can be inserted into the right sensor bore 11, for example.

(10) A heating means 20 is arranged by way of example in the heating block 19 and the heating means 20 can be formed by a heating cuff that surrounds the reception hole 21 in the manner of a sleeve in the lower region close to the base. If the heating means 20 is switched on, it heats the heating block 19 and the heat is transmitted from the heating block 19 to the calibrator sleeve 1 and consequently also to the temperature sensor 10.

(11) In accordance with the invention, the body of the calibrator sleeve 1 has at least two sections having different thermal conductivities 1 and 2. The body here has a first section that forms a calibration section 12 and the calibration section has a higher conductivity 1 than a further section that is configured as a connecting section 13. 1 is thus larger than 2.

(12) If the heating means 20 is now switched on and heats the calibrator sleeve, the calibration section 12 can develop a substantially homogeneous temperature so that a minimal or no temperature gradient results in the longitudinal direction L. A smaller heat dissipation takes place due to the lower thermal conductivity 2 of the connecting section 13 and a substantially uniform temperature is adopted over the height of the calibration section 12 in the longitudinal direction L due to the smaller heat dissipation. Measurement errors are thereby reduced, in particular when the temperature 10 senses temperatures over a larger longitudinal section.

(13) The calibration section 12 is formed from a first material having a higher thermal conductivity 1 and the connecting section 13 is formed from a material having a lower thermal conductivity 2. The calibration section 12, for example, comprises aluminum and the connecting section 13 comprises a stainless steel. The two sections 12 and 13 can each form cylindrical bodies that are connected to one another so that in the longitudinal direction L the connecting section 13 adjoins the calibration section 12 upwardly with respect to the reception hole 21, i.e. in the direction toward the opening of the reception hole 21.

(14) The basic idea of the invention comprises the connecting section 13 of the lower conductivity 2 so-to-say insulating the calibration section 12 within the reception hole 21. Due to the lower thermal conductivity 2, the open face end of the connecting section 13 in the opening of the reception hole 21 produces a smaller thermal outflow caused by convection and as a consequence a more constant temperature is adopted within the volume of the calibration section 12.

(15) FIGS. 2, 3, 4, and 5 show different embodiments of the calibrator sleeve 1 having a lower-side calibration region 12 and a connecting section 13 adjoining at the upper side, with the sections 12 and 13 being permeated by sensor bores 11. Temperature sensors 10 in accordance with FIG. 1 can be inserted into the sensor bores 11, with the measuring section of the temperature sensor 10 being arranged within the calibration section 12 in the inserted state.

(16) FIG. 2 shows a connection between the calibration section 12 and the connecting section 13 in the form of a threaded connection 15 and the calibration section 12 has a collar for this purpose that engages over a section of the connecting section 13 having a reduced diameter. The threaded connection 15 is formed in the section that engages over so that the calibration section 12 and the connecting section 13 can be screwed together. The manufacture of the calibrator sleeve can take place here such that in the screwed together state of the sections 12 and 13, the sensor bores 11 are only subsequently introduced.

(17) FIG. 3 shows a connection between the calibration section 12 and the connecting section 13 in the form of an interference fit assembly 16 so that a section of the connecting section 13 is pressed into a collar of the calibration section 12 at the inner side.

(18) FIG. 4 represents a further connection form between the calibration section 12 and the connecting section 13 in the form of a plastically deformed material section 18 that forms a shape-matched connection. The material region 18 can be shaped into an associated geometry in a rolling process in the connecting section 13 by a rolling procedure or by a crimping procedure.

(19) FIG. 5 finally shows a connection between the calibration section 12 and the connecting section 13 that is formed by means of a screw element 17 that is introduced into the connecting section 13 and is screwed in the calibration section 12.

(20) Further possibilities comprise the formation of a connection with material continuity between the calibration section 12 and the connecting section 13 so that they can be adhesively bonded, soldered, or welded to one another in the joining zone provided that the material selection of the calibration section 12 or of the connecting section 13 permits such joining processes with material continuity.

(21) FIG. 6 shows a further embodiment of a calibrator sleeve 1 having a calibration section 12 in which a temperature sensor 10 is introduced by way of example. A connecting section 13 adjoins the calibration section 12 both at the upper side and at the lower side in the longitudinal direction L. The connecting section 13 having the lower thermal conductivity with respect to the calibration section 12 thus produces an insulation of the calibration section 12 at both sides. The jacket surface 26 of the calibration section 12 has a reduced diameter with respect to the connecting sections 13 and the heating means 20 are furthermore shown by way of example that have a length in the longitudinal direction L that corresponds to the length of the calibration section 12 in the longitudinal direction L. A cuff 22 for insulation is introduced in the jacket surface 26 and, if the heating means 20 heats the calibration section 12 by a radially inwardly directed thermal flow, a uniform temperature profile can be formed by the thermally insulting cuff 22 over the longitudinal extent of the longitudinal direction L in the calibration section 12.

(22) FIG. 7 shows a further alternative embodiment of the calibrator sleeve 1 having a calibration section 12 and having two connecting sections 13 that adjoin the calibration section 12 at the upper side and at the lower side in the longitudinal direction L. The connecting sections 13 are constructed from plate elements 23 between which cut-outs 14 are formed that are filled with air or can be evacuated. For the evacuation, the connecting section 13 can be formed with an envelope 25 that can be evacuated and so that the cut-outs 14 are airless. A second thermal conductivity 2 is consequently formed in the cut-outs 14, said thermal conductivity being formed by the thermal conductivity of air or of a vacuum. The plate elements 23 in the embodiment shown can comprise the same material as also the calibration section 12 or the plate elements 23 comprise a material having a lower thermal conductivity 2 with respect to the higher conductivity 1 of the calibration section 12.

(23) Sleeves 24 are shown by way of example for the construction of and for a holding arrangement of the plate elements 23 and form the sections of the sensor bores 11 over the height of the connecting section 13. The sleeves 24 can, for example, be pressed section-wise into the sensor bores 11 in the calibration section 12.

(24) The invention is not restricted in its design to the preferred embodiment provided above. A number of variants is rather conceivable that also makes use of the solution shown with generally differently designed embodiments. All the features and/or advantages, including any construction details or spatial arrangements, originating from the claims, the description or the drawings can be essential to the invention both per se and in the most varied combinations.

REFERENCE NUMERAL LIST

(25) 100 block calibrator 1 calibrator sleeve 10 temperature sensor 11 sensor bore 12 calibration section 12 connecting section 14 cut-out 15 threaded connection 16 interference fit assembly 17 screw element 18 plastically deformed material region 19 heating block 20 heating means 21 reception hole 22 cuff 23 plate element 24 sleeve 25 envelope 26 jacket surface L longitudinal direction 1 first thermal conductivity 2 second thermal conductivity 2 second thermal conductivity