Patent ID: 11971108
Assignee: SUMITOMO HEAVY INDUSTRIES, LTD.
Field: Thermal processes and apparatus (Mechanical engineering)
Classification: CPC F | IPC F

Claim 2:
3. A rotary valve of a cryocooler, comprising,
a valve stator;
a valve rotor;
a rotation member that rotates the valve rotor around an axis with respect to the valve stator;
a rotor holder connected to the valve rotor so as to rotate around the axis together with the valve rotor, and forming a low pressure section having a pressure lower than an ambient pressure between the valve rotor and the rotor holder so as to reduce an axial force of pressing the valve rotor against the valve stator; and
a valve bearing that supports the rotor holder to be rotatable around the axis,
wherein the rotation member is connected to the rotor holder so as to rotate the valve rotor around the axis via the rotor holder, and
the rotor holder is disposed between the rotation member and the valve rotor in an axial direction, and is movable in the axial direction with respect to the rotation member,
wherein the rotary valve further comprises:
a first restriction member that restricts an axial movement of the rotor holder to a rotation member side,
wherein the first restriction member comprises a restraint member attached to an outer periphery of the rotor holder adjacent to an axially lower side of the valve bearing.