CN-224229234-U - Sealing structure of high-speed rotating shaft

CN224229234UCN 224229234 UCN224229234 UCN 224229234UCN-224229234-U

Abstract

The utility model provides a seal structure of high-speed rotation axis, includes the bearing seat of installing on the high-speed rotation axis through the fulcrum bearing and installs the cavity outside the bearing seat, and the fulcrum bearing both sides are equipped with spacing subassembly, installs sealed lid in the outside of high-speed rotation axis, is equipped with the boss that is used for stopping fluid on the high-speed rotation axis that is located between fulcrum bearing and the sealed lid, is equipped with the annular on the bearing seat in the position of corresponding boss, the annular is linked together with the oil return groove that sets up in the bearing seat inside, be equipped with spiral seal structure and be used for letting in the air inlet that has certain pressure gas to the cavity inside the sealed lid. According to the scheme, through the optimal design, multiple measures such as the oil blocking boss, the spiral sealing structure, the air sealing technology and the oil receiving disc drainage system are adopted, the sealing performance of the high-speed rotating shaft can be remarkably improved, the lubricating oil leakage is effectively prevented, the reliability and the service life of equipment are improved, and the high-speed rotating shaft sealing device can be widely applied to various occasions needing high-speed rotating shaft sealing.

Inventors

LIU JING
LIU DANDAN
LI YUCHUAN
GAO JIAQI
Hao Bangguo
HE LIN

Assignees

洛阳轴承集团股份有限公司

Dates

Publication Date: 20260512
Application Date: 20250512

Claims (8)

1. The sealing structure of the high-speed rotating shaft comprises a supporting seat and a cavity, wherein the supporting seat is arranged on the high-speed rotating shaft through a fulcrum bearing, the cavity is arranged outside the supporting seat, limiting assemblies are arranged on two sides of the fulcrum bearing, and a sealing cover is arranged on the outer side of the high-speed rotating shaft.
2. The sealing structure of the high-speed rotating shaft according to claim 1, wherein the sealing cover is fixed on the supporting seat through a locking piece, and a gap is formed between an inner ring of the sealing cover and the high-speed rotating shaft.
3. The sealing structure of the high-speed rotating shaft according to claim 1, wherein the sealing cover is further provided with a drainage groove, and one end of the drainage groove penetrates through the supporting seat and is communicated with the annular groove.
4. The seal structure of a high-speed rotating shaft according to claim 1, wherein the spiral seal structure is a thread groove formed on an inner ring of the seal cover, and a rotation direction of the thread groove is opposite to a rotation direction of the high-speed rotating shaft.
5. The sealing structure of the high-speed rotating shaft according to claim 1, wherein an oil receiving disc is further arranged on the outer side of the sealing cover, and lubricating oil seeping out through gaps between the sealing cover and the high-speed rotating shaft sequentially passes through the oil receiving disc and an oil return hole arranged on the supporting seat to enter the cavity.
6. The sealing structure of the high-speed rotating shaft according to claim 1, wherein an oil supply ring body is further arranged between the supporting seat and the fulcrum bearing, and lubricating oil sequentially passes through an oil inlet groove of the supporting seat and an oil path on the oil supply ring body to enter the fulcrum bearing through the oil inlet.
7. The sealing structure of a high-speed rotating shaft according to claim 1, wherein the cavity is provided with an exhaust port.
8. The sealing structure of the high-speed rotating shaft according to claim 1, wherein the high-speed rotating shaft is further provided with a sleeve, an inner ring of the fulcrum bearing is fixed on the sleeve, one side end face of the fulcrum bearing is tightly close to the baffle ring and is tightly pressed by two locking nuts, the other side end face of the fulcrum bearing is tightly pressed against a step face on the sleeve, and an outer ring of the fulcrum bearing is fixed in the supporting seat and is tightly pressed by the end cover.

Description

Sealing structure of high-speed rotating shaft Technical Field The utility model relates to the technical field of rotary shaft sealing structures, in particular to a sealing structure of a high-speed rotary shaft. Background It is known that in order to ensure stable and reliable operation of a high-speed rotating shaft for a long period of time, it is necessary to supply lubricating oil to a fulcrum bearing on the rotating shaft and lubricate and cool it, and therefore, in order to prevent leakage of the lubricating oil in the axial direction outside, it is necessary to provide a seal at the shaft end. In the prior art, the sealing measure commonly used for the high-speed rotating shaft is a contact type sealing structure, and a plurality of sealing rings are matched with sealing rings to seal, such as a Chinese patent CN201711325033.3, in the high-speed rotating shaft sealing structure, the traditional contact type sealing structure is difficult to bear huge friction force and heat generated by high-speed rotation, so that a sealing element and a rotating element are damaged, and the normal operation of equipment is affected. Disclosure of utility model The utility model aims to provide a sealing structure of a high-speed rotating shaft, which can improve the sealing performance of the high-speed rotating shaft, prolong the service life of equipment and reduce the maintenance cost. The sealing structure of the high-speed rotating shaft comprises a supporting seat and a cavity, wherein the supporting seat is arranged on the high-speed rotating shaft through a fulcrum bearing, the cavity is arranged outside the supporting seat, limiting assemblies are arranged on two sides of the fulcrum bearing, a sealing cover is arranged on the outer side of the high-speed rotating shaft, a boss for blocking oil is arranged on the high-speed rotating shaft between the fulcrum bearing and the sealing cover, a ring groove is arranged on the supporting seat corresponding to the boss, the ring groove is communicated with an oil return groove arranged inside the supporting seat, and a spiral sealing structure and an air inlet for introducing air with certain pressure into the cavity are arranged on the sealing cover. Further preferably, the sealing cover is fixed on the supporting seat through a locking piece, and a gap is formed between the inner ring of the sealing cover and the high-speed rotating shaft. Further preferably, the sealing cover is further provided with a drainage groove, and one end of the drainage groove penetrates through the supporting seat and is communicated with the annular groove. Further preferably, the spiral sealing structure is a thread groove arranged on the inner ring of the sealing cover, and the rotation direction of the thread groove is opposite to the rotation direction of the high-speed rotating shaft. Further preferably, an oil receiving disc is further arranged on the outer side of the sealing cover, and lubricating oil seeping out from a gap between the sealing cover and the high-speed rotating shaft sequentially passes through the oil receiving disc and an oil return hole arranged on the supporting seat to enter the cavity. Further preferably, an oil supply ring body is arranged between the supporting seat and the fulcrum bearing, and lubricating oil sequentially passes through an oil inlet groove of the supporting seat and an oil path on the oil supply ring body to enter the fulcrum bearing through the oil inlet. Further preferably, the cavity is provided with an exhaust port. Further preferably, the high-speed rotating shaft is also provided with a sleeve, the inner ring of the fulcrum bearing is fixed on the sleeve, one side end surface of the fulcrum bearing is tightly close to the baffle ring and is tightly pressed by two lock nuts, the other side end surface of the fulcrum bearing is tightly pressed on a step surface on the sleeve, and the outer ring of the fulcrum bearing is fixed in the supporting seat and is tightly pressed by the end cover. The beneficial effects of the utility model are as follows: Based on the defects existing in the prior art, the scheme provides a sealing structure of a high-speed rotating shaft, and the structure is optimized, and multiple measures such as an oil blocking boss, a spiral sealing structure, an air sealing technology and an oil receiving disc drainage system are adopted. In order to ensure that even a small amount of oil leakage can be properly treated, an oil receiving disc drainage system is adopted, and the system can drain the leaked oil to a designated position, so that the pollution or damage of the oil to other parts of the equipment is avoided. Through the comprehensive measures, the sealing structure can obviously improve the sealing performance of the high-speed rotating shaft, and effectively prevent lubricating oil from leaking, so that the reliability and the service life of equipment are improved; Meanwhile, the sealing structu