Mechanical sealing device for covering compressor pump with moderator

The utility model belongs to the technical field of mechanical sealing devices for compressors, and particularly relates to a mechanical sealing device for covering a compressor pump with a moderator. Comprising a rotating part and a static part, the rotating part rotates along with a shaft through a shaft sleeve to drive a moving ring to rotate and form a friction pair with a static ring, and when rotating again, a stable liquid film is formed between end faces of the friction pair to ensure that a medium is sealed by the end faces. The floating throttling ring has the beneficial effects that the floating throttling ring is adopted and is fixed by the pressing plate; the floating throttling ring adopts a split type, and a small gap is formed between an inner hole and the excircle of the shaft sleeve, so that media can be effectively prevented from leaking when the main seal is completely invalid; the thickness of the pressing plate and the strength of the bolt are calculated, axial force generated by medium