Valve with position sensor
Valve comprising a shutter ( 2 ) rotating as one (A) with a shaft ( 3 ) and a sensor sensing the rotational position of the shaft ( 3 ), which comprises a target holder ( 4 a ) push-fitted onto the shaft ( 3 ), a plate ( 6 ) slipped onto the shaft ( 3 ), the target holder ( 4 a ) and the annular part ( 6 a ) being in one and the same plane.
1. Valves and fittings apparatus comprising:
a valve with a closure member ( 2 ) rotating in unison with a shaft ( 3 ),
an actuator (A) driving the shaft ( 3 ) in rotation, and
an annular sensor of the rotational position of the shaft ( 3 ) fitted on the shaft ( 3 ), characterised in that
the sensor is interposed, in the longitudinal direction of the shaft ( 3 ), between the valve and the actuator (A) and has a thickness, that is, the dimension in the longitudinal direction of the shaft ( 3 ), between 1.5 and 4 mm,
the sensor including:
an annular target-holder ( 4 a ) carrying a target ( 4 ) sensitive to an action at a distance and fitted on the shaft ( 3 ) in such a way as to rotate in unison therewith and to be able to be displaced in translation along the shaft ( 3 ),
a plate-holder ( 5 ), the thickness of which is higher than the thickness of all the other components of the sensor,
a small plate ( 6 ) fitted on the shaft ( 3 ) by way of an annular portion ( 6 a ) without being rotationally unified therewith, this portion ( 6 a ) containing two detectors ( 7 , 8 ) of the target ( 4 ), at 90° one with respect to the other, and
the target-holder ( 4 a ) and the annular portion ( 6 a ) are in the same plane.
2. Apparatus according to claim 1 , characterised in that the plate-holder ( 5 ) is gripped between a fixed plate ( 1 a ) of the valve and the actuator (A) so that the three parts are unified.
3. Apparatus according to claim 1 , characterised in that the upper face of the small plate ( 6 ) is coated with a resin until it is flush with the upper face of the plate-holder ( 5 ).
4. Apparatus according to claim 3 , characterised in that the small plate ( 6 ) contains a hole ( 16 ) opening into a casing ( 9 ) filled with resin arranged underneath the lower face of the small plate.
5. Apparatus according to claim 4 , characterised in that the casing ( 9 ) has an opening ( 11 a ) for connection of an element for transmission of an electrical signal emitted by printed circuits of the small plate ( 6 ).
6. Apparatus according to claim 1 , characterised in that the target ( 4 ) is fixed in the target-holder ( 4 a ) by moulding resin thereon.
7. Apparatus according to claim 5 , characterised in that, after introducing and polymerising of the resin in the casing ( 9 ) and until the resin is flush with the upper face of the plate-holder ( 5 ), all the components comprising the plate-holder ( 5 ) the small plate ( 6 ), the detectors ( 7 , 8 ), the casing ( 9 ), a battery ( 12 ), a connector ( 10 ) and an antenna ( 11 ), are bound in a sensor assembly (CP) without any possibility to separate them.
8. Sensor comprising:
an annular target-holder ( 4 a ) carrying a target ( 4 ) sensitive to an action at a distance and fitted on a shaft ( 3 ) in such a way as to rotate in unison therewith and to be able to be displaced in translation along the shaft ( 3 ),
a plate-holder ( 5 ) which forms the body of the sensor and the thickness of which is higher than the thickness of all the other components of the sensor,
a small plate ( 6 ) fitted on the shaft ( 3 ) by way of an annular portion ( 6 a ) without being rotationally unified therewith, this portion ( 6 a ) containing two detectors ( 7 , 8 ) of the target ( 4 ), at 90° one with respect to the other, and
the target-holder ( 4 a ) and the annular portion ( 6 a ) are in the same plane.
characterised in that:
the small plate ( 6 ) contains a hole ( 16 ) opening into a casing ( 9 ) filled with resin arranged underneath the lower face of the small plate, and
the plate-holder ( 5 ) the small plate ( 6 ), the detectors ( 7 , 8 ), the casing ( 9 ), a battery ( 12 ), a connector ( 10 ) and an antenna ( 11 ), are bound in a sensor assembly (CP) without any possibility to separate them.