Temperature-measuring stick with an easily replaceable thermocouple
The invention relates to a thermocouple ( 17 ) suspended from a part ( 26, 27 ) that can be locked onto a connecting section of the measuring stick, which comprises an opening in the form of a guiding cone ( 30 ) for inserting the thermocouple. The thermocouple is contained in a flexible cable ( 24 ) that can slide in a sheath ( 35 ) of the central compartment ( 16 ) which houses the thermocouple ( 17 ). A spring ( 34 ) can be added to lightly press the end of the thermocouple to the end of the housing thereof.
1. A temperature-measuring stick, comprising a shell, a longitudinal compartment contained in the shell, between an interface with an external medium and a measuring tip belonging to the shell, and a thermocouple housed in the compartment, wherein the thermocouple comprises a flexible cable forming an external shell of the thermocouple, the compartment is delimited by a cable sliding sheath, the interface comprises a conical opening for introducing the cable, leading to the compartment and tapering to said compartment, and the thermocouple comprises a locking piece, lockable to the interface.
2. The temperature-measuring stick according to claim 1 , wherein the thermocouple comprises a spring extending between a bearing surface for bearing against the cable and a bearing surface for bearing against the locking piece, and compressed between the bearing surfaces at a locking state of the piece to the interface.
3. The temperature-measuring stick according to claim 1 , wherein the sheath is crimped to a thermally insulating liner belonging to the tip.
4. The temperature-measuring stick according to claim 1 , wherein the sheath is crimped to the conical opening.
5. The temperature-measuring stick according to claim 1 , wherein the shell is double and comprises an internal shell and an external shell, and cooling channels extend between the internal shell and the external shell.
6. Temperature-measuring stick according to claim 1 , wherein the sheath is flexible and comprised of a braid of glass fibres coated with a solvent-free polyurethane varnish.
7. The temperature-measuring stick according to claim 1 , wherein the sheath is of a thermally insulating rigid material.
8. The temperature-measuring stick according to claim 7 , wherein the material of the sheath is alumina.
9. The temperature-measuring stick according to claim 1 , wherein the locking piece comprises a cylindrical centring finger, carrying a bearing surface for bearing against the locking piece, said finger sliding in a sleeve integral with the shell.
10. The temperature-measuring stick according to claim 9 , wherein the shell is bent as well as the sheath, and the sheath is divided into tubular bead type segments, where it is bent.
11. The temperature-measuring stick according to claim 10 , wherein the material of the sheath is alumina.