Rotary viscometer and fluid conveyance device

1 . A rotary viscometer comprising:

a measurement rotor that comes into contact with a fluid whose viscosity is to be detected;

a rotating shaft that is connected to the measurement rotor;

a drive part comprising a motor that rotates the measurement rotor via the rotating shaft;

a measurement part comprising a sensor that measures the viscosity of the fluid based on torque generated in accordance with rotation of the measurement rotor;

a housing that accommodates at least the measurement rotor, the rotating shaft, and the drive part; and

a window part that is provided in the housing such that the rotating shaft is observable from outside the housing,

wherein the housing includes a lower housing, an intermediate housing, and an upper housing,

wherein the lower housing is connected to a piping part,

wherein the intermediate housing connects the lower housing and the upper housing,

wherein the lower housing accommodates the measurement rotor and one end of the rotating shaft and has a fluid inlet and a fluid outlet that communicate an interior of the housing and an exterior of the housing,

wherein the fluid inlet is connected to the upstream side of the piping part, and the fluid outlet is connected to the downstream side of the piping part,

wherein the measurement rotor comes into contact with a fluid flowing into the lower housing,

wherein the rotating shaft is connected to the measurement rotor at one end, and, from the lower housing through the intermediate housing, the other end of the rotating shaft reaches an interior of the upper housing,

wherein the connecting part between the lower housing and the intermediate housing is sealed such that the fluid in the lower housing does not flow into the intermediate housing,

wherein the upper housing accommodates the other end of the rotating shaft and the drive part,

wherein the rotary viscometer is an in-line type that is installed in the piping part through which the fluid flows,

wherein the rotating shaft has a coupling for transmitting torque of the drive part to the measurement rotor,

wherein the coupling has a drive magnet and a driven magnet,

wherein the drive magnet is fixed to a drive part side of the rotating shaft,

wherein the driven magnet is fixed to a measurement rotor side of the rotating shaft, and

wherein the window part is provided such that both the coupling and the driven magnet are observable from outside the housing.

2 . The rotary viscometer according to claim 1 , comprising:

a lid member that is detachably set in the window part.

3 . The rotary viscometer according to claim 1 , wherein

the fluid is an electrode slurry of a secondary battery.

4 . The rotary viscometer according to claim 1 , comprising:

a sensor that is installed on the window part and that detects a rotation state of the rotating shaft.

5 . A fluid conveyance device comprising:

a piping part through which a fluid whose viscosity is to be detected flows; and

the rotary viscometer according to claim 1 that is installed in the piping part.