Electromotive expansion valve and refrigeration circuit

An electromotive expansion valve for a refrigeration circuit for expanding a two-phase refrigerant, comprising:

• a hydraulic flange for integrating the expansion valve into the refrigeration circuit, the flange including a refrigerant path for conducting a refrigerant and a flow opening, which is configured in the refrigerant path and through which the refrigerant is flowable;
• a housing fastened to the hydraulic flange;
• a valve body unit for controlling the flow opening of the hydraulic flange;
• an electric motor for axially adjusting the valve body unit;
• the electric motor including a stator arranged in the housing in a torque-proof and axially fixed manner, the stator including at least one stator coil;
• the electric motor further including a rotor mounted in the housing concentrically to the stator and rotatable about an axis of rotation, the rotor including a cylindrical magnet arrangement having at least one permanent magnet;
• the electric motor further including a can arranged in the housing concentrically to the axis of rotation and radially between the rotor and the stator in a torque-proof and axially fixed manner;
• the can closed at a first axial end with a bearing bushing, the bearing bushing inserted into a housing opening that is configured concentrically to the axis of rotation on the housing, the bearing bushing connected to the housing and to the can in a torque-proof manner, the bearing bushing including a bushing opening arranged concentrically to the axis of rotation;
• the can closed at a second axial end with a can base;
• the valve body unit extending through the bushing opening concentrically to the axis of rotation and including a needle body;
• the rotor further including a rotor sleeve arranged in the magnet arrangement concentrically to the axis of rotation, the rotor sleeve connected to the magnet arrangement in a torque-proof manner and including an internal threading;
• the valve body unit including a drive rod extending axially into the rotor sleeve, the drive rod including an external threading in a region of the rotor sleeve, which is in engagement with the internal threading of the rotor sleeve;
• wherein the drive rod extends axially through the bushing opening;
• and
• wherein a torque-proof axial guide is disposed between the bearing bushing and the drive rod such that the valve body unit is torque-proof while the rotor is turning and adjusts itself axially.