SHAFT SEALING INSERT Russian patent published in 2016 - IPC F16J15/34 

FIELD: machine building.

SUBSTANCE: invention relates to a shaft seal insert (DGSM) for a shaft seal (SHS) of a turbomachine (CO), which extends in an axial direction along an axis of rotation (AX), comprising a rotor part (RS) which is configured such that it can be mounted on a shaft (SH) of a rotor (R) which extends along axis of rotation (AX), a stator part (CS) which is configured such that it can be inserted into a stator recess (CR), at least one dry gas seal (DGS) having a rotating sealing element (RSE) mounted on rotor part (RS) and a static sealing element (SSE) mounted on stator part (CS) in order to seal an intermediate space (IR). Static sealing element (SSE) and rotating sealing element (RSE) are arranged facing each other on a sealing surface which extends radially and in circumferential direction, wherein shaft seal insert (DGSM) has a high-pressure side (HPS) at one axial end and a low-pressure side (LPS) at other axial end. It is proposed that labyrinth seal (LS) for sealing intermediate space (IR) is provided on high-pressure side (HPS) in a serial arrangement with dry gas seal (DGS), including a static labyrinth seal part (SLSM) and a rotating labyrinth seal part (RLSM). Static labyrinth seal part (SLSM) is either part of, or is securely mounted on, stator part (CS), and wherein rotating labyrinth seal part (RLSM) is either part of, or is securely mounted on, rotor part (RS).

EFFECT: invention simplifies design of seal of turbomachine.

8 cl, 2 dwg