Patent ID: 9011122
Filing Date: 2015-04-21
Classification: F01D,F04C

Abstract:
1. A stator seal structure in a uniaxial eccentric screw pump, the stator seal structure comprising: a male-threaded rotor coupled to a driving shaft; a stator rotatably coupled to a housing via a bearing and having a female-threaded inner surface with a rotational axial line arranged to be eccentric with respect to a rotational axial line of the rotor; and a pair of sealing mechanisms for sealing space between the housing and an intake side end portion of the stator, and between the housing and a discharge side end portion of the stator, wherein each of the pair of sealing mechanisms has a ring-shaped secured ring arranged opposite to the stator in a direction of the rotational axial line of the rotor and secured to the housing, the ring-shaped secured ring having a sliding seal surface sliding on a sliding seal surface of the stator, wherein the ring-shaped secured ring is attached with an elastic body for ensuring with an elastic force of the elastic body a contact pressure between the sliding seal surface of the stator and the sliding seal surface of the ring-shaped secured ring and for sealing space between the secured ring and the housing, wherein the ring-shaped secured ring is made of ceramics or cemented carbide, and wherein the sliding seal surface of the stator is coated with ceramics.