Sealing structure of high-speed rotating shaft

Abstract

A sealing structure of a high-speed rotating shaft comprises a supporting seat installed on the high-speed rotating shaft through a fulcrum bearing and a cavity installed outside the supporting seat, limiting assemblies are arranged on the two sides of the fulcrum bearing, and a sealing cover is installed on the outer side of the high-speed rotating shaft. A boss used for blocking oil is arranged on the high-speed rotating shaft located between the fulcrum bearing and the sealing cover, an annular groove is formed in the position, corresponding to the boss, of the supporting seat, and the annular groove is communicated with an oil return groove formed in the supporting seat. The sealing cover is provided with a spiral sealing structure and an air inlet used for introducing air with certain pressure into the cavity. According to the scheme, by optimizing design and adopting multiple measures such as the oil blocking boss, the spiral sealing structure, the air sealing technology and the oil receiving disc drainage system, the sealing performance of the high-speed rotating shaft can be remarkably improved, lubricating oil leakage is effectively prevented, the reliability of equipment is improved, the service life of the equipment is prolonged, and the high-speed rotating shaft sealing device can be widely applied to various occasions needing high-speed rotating shaft sealing.

Description

Technical Field

[0001] This utility model relates to the technical field of rotating shaft sealing structure, specifically a sealing structure for a high-speed rotating shaft. Background Technology

[0002] As is well known, in order to ensure the stable and reliable operation of a high-speed rotating shaft for a long time, it is necessary to supply lubricating oil to the pivot bearings on the rotating shaft for lubrication and cooling. Therefore, in order to prevent the lubricating oil from leaking outward along the shaft axis, sealing measures need to be installed at the shaft end.

[0003] In the prior art, the commonly used sealing measure for high-speed rotating shafts is a contact sealing structure, which uses multiple sealing rings in conjunction with sealing rings for sealing, such as Chinese patent CN201711325033.3, a high-speed rotating shaft sealing structure. Traditional contact sealing structures are difficult to withstand the huge friction and heat generated by high-speed rotation, resulting in damage to the sealing components and rotating components, affecting the normal operation of the equipment. Utility Model Content

[0004] The purpose of this invention is to propose a sealing structure for a high-speed rotating shaft. This solution can improve the sealing performance of the high-speed rotating shaft, extend the service life of the equipment, and reduce maintenance costs.

[0005] The technical solution adopted by this utility model is: a sealing structure for a high-speed rotating shaft, including a support seat mounted on the high-speed rotating shaft via a pivot bearing and a cavity mounted outside the support seat. Limiting components are provided on both sides of the pivot bearing. A sealing cover is installed on the outside of the high-speed rotating shaft. A boss for blocking oil is provided on the high-speed rotating shaft located between the pivot bearing and the sealing cover. A ring groove is provided on the support seat corresponding to the position of the boss. The ring groove is connected to an oil return groove provided inside the support seat. The sealing cover is provided with a spiral sealing structure and an air inlet for introducing gas with a certain pressure into the cavity.

[0006] Further optimization involves fixing the sealing cover to the support base via a locking element, with a gap between the inner ring of the sealing cover and the high-speed rotating shaft.

[0007] Further optimization involves providing a drainage groove on the sealing cover, with one end of the drainage groove penetrating the interior of the support base and communicating with the annular groove.

[0008] Further optimization involves a spiral sealing structure consisting of a threaded groove on the inner ring of the sealing cover, with the direction of the threaded groove opposite to the rotation direction of the high-speed rotating shaft.

[0009] Further optimization involves providing an oil receiving tray on the outside of the sealing cover. The lubricating oil that seeps out through the gap between the sealing cover and the high-speed rotating shaft enters the cavity through the oil receiving tray and the oil return hole set on the support seat.

[0010] Further optimization involves installing an oil supply ring between the support seat and the pivot bearing. Lubricating oil enters the pivot bearing through the oil inlet, the oil inlet groove of the support seat, and the oil passage on the oil supply ring.

[0011] Further optimization involves providing an exhaust port on the cavity.

[0012] Further optimization involves a sleeve on the high-speed rotating shaft, with the inner ring of the pivot bearing fixed on the sleeve. One end face of the pivot bearing is tightly fitted to the retaining ring and pressed by two locking nuts, while the other end face is pressed against the stepped surface on the sleeve. The outer ring of the pivot bearing is fixed inside the support seat and pressed by the end cover.

[0013] The beneficial effects of this utility model are:

[0014] To address the shortcomings of existing technologies, this solution provides a sealing structure for a high-speed rotating shaft. Through structural optimization, it employs multiple measures including an oil-blocking boss, a spiral sealing structure, air sealing technology, and an oil draining system. Specifically, an oil-blocking boss is installed on the rotating shaft to effectively prevent lubricating oil from leaking outwards along the axial direction; a spiral sealing structure and draining groove are installed on the sealing cover to enhance the sealing effect; and air sealing technology is used to form an air barrier between the sealing cover and the shaft, further reducing the possibility of lubricating oil leakage. To ensure that even minor oil leaks can be properly handled, an oil draining system is employed. This system can drain leaked lubricating oil to a designated location, thereby preventing the lubricating oil from contaminating or damaging other parts of the equipment. Through these comprehensive measures, the sealing structure of this invention significantly improves the sealing performance of the high-speed rotating shaft, effectively prevents lubricating oil leakage, and thus improves the reliability and service life of the equipment.

[0015] Meanwhile, this sealing structure and method have good adaptability and versatility, and can be widely used in various occasions that require high-speed rotating shaft sealing. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of this utility model.

[0018] Attached reference numerals: 1-oil receiving pan, 2-high-speed rotating shaft, 3-sealing cover, 4-locking nut, 5-retaining ring, 6-oil supply ring body, 7-pivot bearing, 8-sleeve, 9-end cover, 10-support seat, 11-cavity, A-oil inlet, B-oil return groove, C-bore, D-drain groove, E-air inlet, F-oil return hole, G-exhaust port, H-spiral sealing structure. Detailed Implementation

[0019] The present invention will now be described in detail through exemplary embodiments. However, it should be understood that, without further description, elements, structures, and features in one embodiment may be advantageously incorporated into other embodiments.

[0020] It should be noted that, unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this utility model pertains; the words "a," "an," or "the" and similar terms used in the specification and claims of this utility model patent application do not express a quantity limitation, but rather indicate the presence of at least one; the words "comprising" or "including" and similar terms indicate that the elements or objects preceding "comprising" or "including" cover the elements or objects listed following "comprising" or "including" and their equivalents, but do not exclude other elements or objects having the same function;

[0021] To more clearly describe the specific composition and sealing method of a sealing structure for a high-speed rotating shaft, this embodiment is described in detail with reference to the accompanying drawings:

[0022] like Figure 1As shown, a sealing structure for a high-speed rotating shaft includes a high-speed rotating shaft 2, a sealing cover 3, a locking nut 4, a retaining ring 5, an oil supply ring 6, a pivot bearing 7, a sleeve 8, an end cover 9, a support seat 10, and a cavity 11. The sleeve 8 is fixed to the high-speed rotating shaft 2 and rotates synchronously with it. The inner ring of the pivot bearing 7 is fixed to the sleeve 8, with one end face tightly against the retaining ring 5 and pressed by two locking nuts 4, while the other end face presses against the sleeve 8. On the stepped surface, the outer ring of the pivot bearing 7 is fixed inside the support seat 10 and pressed by the end cover 9; the high-speed rotating shaft 2, the inner ring of the pivot bearing 7, the locking nut 4, the retaining ring 5, and the sleeve 8 are driven to rotate at high speed. Lubricating oil is delivered to the oil inlet A position on the support seat 10 through the external oil supply pipeline at a specific pressure and flow rate, entering the oil inlet groove of the support seat 10, and then entering the pivot bearing 7 through the oil passage of the oil supply ring body 6 to lubricate the pivot bearing 7. During the lubrication process, the lubricating oil... Part of the lubricating oil enters the cavity 11 through the left side of the pivot bearing 7, while the other part enters the cavity 11 through the right side of the pivot bearing 7, via the oil return groove B on the support seat 10, and is then drawn back by the oil return pump through the oil return pipeline. The sealing cover 3 is fixed to the support seat 10 by a screw assembly. A small gap is reserved between the inner ring of the sealing cover 3 and the high-speed rotating shaft 2 to prevent the high-speed rotating shaft 2 from contacting the sealing cover 3 during high-speed rotation. The high-speed rotating shaft 2 located between the pivot bearing 7 and the sealing cover 3 is provided with a boss C for blocking the movement of oil along the shaft. A certain depth of an annular groove is machined on the support seat 10 corresponding to the position of the boss C. This annular groove is connected to the oil return groove B located inside the support seat 10. When part of the lubricating oil moves outward along the axial direction of the high-speed rotating shaft 2, the boss C plays an effective role in blocking the oil. At the same time, the high-speed movement of the rotating shaft, in conjunction with the boss C, throws the lubricating oil into the annular groove, guides it through the bottom of the annular groove to the oil return groove B on the support seat, and then enters the cavity 11.

[0023] In this embodiment, the sealing cover 3 is provided with a spiral sealing structure H and a drainage groove D. One end of the drainage groove D penetrates the interior of the support seat 10 and is connected to the annular groove. The spiral sealing structure H here is a threaded groove provided on the inner ring of the sealing cover 3. The spiral sealing structure can be machined into a left-hand thread or a right-hand thread according to the rotation direction of the rotating spindle, so as to play the role of oil drainage. The optimal direction is that the rotation direction of the threaded groove is opposite to the rotation direction of the high-speed rotating shaft. Excess lubricating oil is drained from the drainage groove D to the annular groove of the support seat 10, and then enters the cavity again through the return oil groove B.

[0024] The sealing cover 3 is also provided with an air inlet E for introducing gas with a certain pressure into the cavity. Through the air inlet E, air is introduced into the cavity at a pressure higher than that inside the cavity, forming a pressure difference inside the cavity. The low-pressure air inside the cavity is discharged from the exhaust port G, further preventing lubricating oil from overflowing.

[0025] In this embodiment, an oil receiving pan 1 is also provided on the outside of the sealing cover 3. The lubricating oil that seeps out through the gap between the sealing cover 3 and the high-speed rotating shaft 2 enters the interior of the cavity 11 through the oil receiving pan 1 and the oil return hole F provided on the support seat 10.

[0026] The parts not described in detail in the above embodiments are existing technologies.

[0027] It should be noted that although the present invention has been described through the above embodiments, there may be other various embodiments of the present invention. Without departing from the spirit and scope of the present invention, those skilled in the art can obviously make various corresponding changes and modifications to the present invention, but all such changes and modifications should fall within the scope of protection of the appended claims and their equivalents.

Claims

1. A sealing structure for a high-speed rotating shaft, comprising a support seat mounted on the high-speed rotating shaft via a pivot bearing and a cavity mounted outside the support seat, wherein limiting components are provided on both sides of the pivot bearing, and a sealing cover is installed on the outside of the high-speed rotating shaft, characterized in that: A boss for blocking oil is provided on the high-speed rotating shaft located between the pivot bearing and the sealing cover. A ring groove is provided on the support seat corresponding to the position of the boss. The ring groove is connected to the oil return groove provided inside the support seat. The sealing cover is provided with a spiral sealing structure and an air inlet for introducing gas with a certain pressure into the cavity.

2. The sealing structure for a high-speed rotating shaft according to claim 1, characterized in that: The sealing cover is fixed to the support base by a locking member, and there is a gap between the inner ring of the sealing cover and the high-speed rotating shaft.

3. The sealing structure for a high-speed rotating shaft according to claim 1, characterized in that: The sealing cover is also provided with a drainage groove, one end of which penetrates the interior of the support and is connected to the annular groove.

4. The sealing structure for a high-speed rotating shaft according to claim 1, characterized in that: The spiral sealing structure is a threaded groove provided on the inner ring of the sealing cover, and the direction of the threaded groove is opposite to the rotation direction of the high-speed rotating shaft.

5. The sealing structure for a high-speed rotating shaft according to claim 1, characterized in that: An oil receiving pan is also provided on the outside of the sealing cover. The lubricating oil that seeps out through the gap between the sealing cover and the high-speed rotating shaft enters the cavity through the oil receiving pan and the oil return hole set on the support seat.

6. The sealing structure for a high-speed rotating shaft according to claim 1, characterized in that: An oil supply ring is also provided between the support seat and the pivot bearing. The lubricating oil enters the pivot bearing through the oil inlet, the oil inlet groove of the support seat, and the oil passage on the oil supply ring.

7. The sealing structure for a high-speed rotating shaft according to claim 1, characterized in that: The cavity is equipped with an exhaust port.

8. The sealing structure for a high-speed rotating shaft according to claim 1, characterized in that: The high-speed rotating shaft is also equipped with a sleeve, the inner ring of the pivot bearing is fixed on the sleeve, one end face of which is closely close to the retaining ring and is pressed by two locking nuts, and the other end face is pressed against the stepped surface on the sleeve. The outer ring of the pivot bearing is fixed in the support seat and pressed by the end cover.

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