Magnetic fluid sealed shaft assembly, shielded motor, and shielded pump

A magnetic fluid sealed shaft assembly, comprising:

• a housing in which an accommodating cavity is provided, the accommodating cavity being provided with a fixed structure on an inner wall;
• a rotating shaft supported and mounted in the accommodating cavity;
• a magnetic fluid sealing device which is located in the accommodating cavity and is sleeve mounted on the rotating shaft, wherein the housing is provided with space for runout of the magnetic fluid sealing device following the rotating shaft and/or adjustment of a mounting angle and position according to a mounting state of the rotating shaft;
• and
• a resilient member which is hermetically connected to both the magnetic fluid sealing device and the fixed structure, wherein after the magnetic fluid sealing device is resiliently and hermetically connected to the fixed structure by the resilient member, the magnetic fluid sealing device is configured to runout following the rotating shaft and/or adjust the mounting angle and position according to the mounting state of the rotating shaft;
• wherein
• a radial spacing is provided between the fixed structure and the magnetic fluid sealing device, and the resilient member is a resilient connecting ring, a part of the resilient connecting ring being fixedly mounted on a first end portion of the magnetic fluid sealing device and the other part of the resilient connecting ring being fixedly mounted on the fixed structure;
• and
• a positioning structure is provided inside the housing and corresponding to a second end portion of the magnetic fluid sealing device, a cushion pad being provided between the positioning structure and the second end portion of the magnetic fluid sealing device.

A magnetic fluid sealed shaft assembly, comprising:

• a housing in which an accommodating cavity is provided, the accommodating cavity being provided with a fixed structure on an inner wall;
• a rotating shaft supported and mounted in the accommodating cavity;
• a magnetic fluid sealing device which is located in the accommodating cavity and is sleeve mounted on the rotating shaft, wherein the housing is provided with space for runout of the magnetic fluid sealing device following the rotating shaft and/or adjustment of a mounting angle and position according to a mounting state of the rotating shaft;
• and
• a resilient member which is hermetically connected to both the magnetic fluid sealing device and the fixed structure, wherein after the magnetic fluid sealing device is resiliently and hermetically connected to the fixed structure by the resilient member, the magnetic fluid sealing device is configured to runout following the rotating shaft and/or adjust the mounting angle and position according to the mounting state of the rotating shaft;
• wherein an outer gas blockage cavity is provided inside the housing and below the magnetic fluid sealing device, and the outer gas blockage cavity is configured to form a gas blockage after the bottom of the housing is sealed;
• and
• an inner gas blockage hood, wherein the inner gas blockage hood is mounted in the outer gas blockage cavity and hermetically connected to a lower end of the magnetic fluid sealing device along the axial direction, and the inner gas blockage hood is provided around the outer side of a part of the rotating shaft that extends into the outer gas blockage cavity, an inner gas blockage cavity is formed between the inner gas blockage hood and the rotating shaft, and after the bottom of the housing is sealed, the inner gas blockage cavity is configured to form a gas blockage.