Oil mist bearing seal

Abstract

The utility model discloses an oil mist bearing sealer relates to the technical field of oil mist sealing, and the utility model aims at solving the problem that the existing centrifugal pump main shaft seal exists leakage, and the utility model discloses an axial sleeve, the top of axial sleeve is provided with the limiting shoulder, and it is characterized by: a plurality of non - contact arc fin of equidistance is provided in the axial sleeve, so that the annular groove is formed between any two arc fin.

Description

Technical Field

[0001] This utility model relates to the technical field of oil mist sealing, and specifically to an oil mist bearing sealer. Background Technology

[0002] Currently, all centrifugal pump bearing housing structures use comb-tooth seals with return oil holes on both sides, and a dustproof disc on the outside. The flanges are made of tin bronze or cast iron. The radial clearance of this seal is typically 0.5mm, but in actual use, it is much larger than this size, causing lubricating oil mist to leak out. Years of field practice have shown that even with a very small clearance, slight oil mist leakage still occurs. During actual operation, the pump's long-term vibration can cause the dustproof disc to loosen. Friction between the pump shaft and the dustproof disc can cause overheating, deforming the inner hole of the dustproof disc and leading to lubricating oil leakage. Simultaneously, under centrifugal negative pressure, the gap between the sealing disc and the pump shaft allows various atmospheric substances from the surrounding environment, including humid air, dust, and acidic air, to enter the pump body through the seal gap, contaminating and corroding the pump body lubricating oil and bearings. All of these factors severely affect the pump's service life, and long-term oil mist leakage also pollutes the air environment around the equipment.

[0003] Referring to existing oil mist sealing structures for centrifugal pumps, some employ annular grooves to achieve labyrinth seals to solve the aforementioned problems. However, because the side walls of the annular groove are triangularly structured, if oil mist condenses within the annular groove, or if the main shaft stops rotating, the condensed lubricating oil or oil mist sealed within the annular groove will seep through the triangular side walls into the next layer of the annular groove. Over time, this will lead to leakage problems. Utility Model Content

[0004] To address the aforementioned problem of leakage in existing centrifugal pump spindle seals, this invention proposes an oil mist bearing seal, which includes an axial sleeve. The top of the axial sleeve is configured as a limiting shoulder, and several non-contact arc-shaped fins are equidistantly arranged inside the axial sleeve so that any two arc-shaped fins form an annular groove.

[0005] A further feature of this invention is that two contact-type sealing rings are provided inside the axial sleeve, and the two sealing rings are respectively disposed on both sides of the plurality of arc-shaped fins.

[0006] A further feature of this invention is that the sealing ring is made of composite graphite material.

[0007] A further feature of this invention is that both the axial sleeve and the arc-shaped fins are made of tin-phosphor bronze.

[0008] A further feature of this invention is that the arc-shaped fins are provided in at least three pieces.

[0009] The beneficial effects of this utility model are as follows:

[0010] By utilizing both contact and non-contact sealing methods, a better sealing effect can be achieved. When a small amount of fluid penetrates the sealing ring and enters the annular groove, the pressure drops significantly and the velocity increases due to the small gap between the arc-shaped fins and the main shaft. Some of the static pressure can be converted into kinetic energy. After the fluid passes through, the space inside the annular groove is large, and the cross-sectional area of ​​the fluid suddenly expands, forming a clear vortex. The velocity almost disappears, meaning the kinetic energy is converted into heat energy and dissipated. The pressure cannot support the fluid to return to the level before the gap, so the fluid will not continue to move forward. Alternatively, it may enter the next stage while maintaining a small pressure, and then continue to release pressure, eventually consuming its kinetic energy. Due to the arc shape of the arc-shaped fins, when oil mist condenses or the main shaft stops rotating, its arc-shaped guide surface will cause the fluid to flow inward, further preventing leakage. Attached Figure Description

[0011] Figure 1 A cross-sectional view of the present invention is shown. Figure 1 .

[0012] Figure 2 A cross-sectional view of the present invention is shown. Figure 2 .

[0013] Reference numerals: 1. Axial sleeve; 11. Limiting shoulder; 2. Arc-shaped fin; 3. Sealing ring. Detailed Implementation

[0014] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0015] refer to Figure 1 This utility model proposes an oil mist bearing seal, including an axial sleeve 1, which is used to install on the main shaft of a centrifugal pump. The top end of the axial sleeve 1 is integrally provided with a limiting shoulder 11. Three non-contact arc-shaped fins 2 are installed equidistantly inside the axial sleeve 1. The openings of the arc-shaped fins 2 are arranged facing the inside of the centrifugal pump, and an annular groove is formed between any two arc-shaped fins 2.

[0016] Two contact-type sealing rings 3 are also installed inside the axial sleeve 1. That is, the sealing rings 3 are in contact with the main shaft. The two sealing rings 3 are respectively set on the two sides of the three arc-shaped fins 2, so that the arc-shaped fins 2 at the end and the sealing rings 3 close to them can also form an annular groove.

[0017] It should be noted that the sealing ring 3 is made of composite graphite material, which is a composite of molybdenum tetrasulfide and graphite. This material has excellent strength, anti-friction properties, and self-lubricating properties. The axial sleeve 1 and the arc-shaped fin 2 are both made of tin-phosphor bronze.

[0018] In summary, this invention utilizes both contact and non-contact sealing methods for better sealing. When a small amount of fluid penetrates the sealing ring 3 and enters the annular groove, the pressure drops significantly and the velocity increases due to the small gap between the arc-shaped fins 2 and the main shaft. Some static pressure is converted into kinetic energy. After the fluid passes through, the space inside the annular groove is large, and the cross-sectional area of ​​the fluid suddenly expands, forming a clear vortex. The velocity almost disappears, meaning the kinetic energy is converted into heat energy and dissipated. The pressure cannot support the fluid to return to the level before the gap, so the fluid will not continue to move forward. Alternatively, it may enter the next stage while maintaining a small pressure, and then continue to release pressure, eventually consuming its kinetic energy. Due to the arc shape of the arc-shaped fins 2, when oil mist condenses or the main shaft stops rotating, its arc-shaped guide surface will cause the fluid to flow inward, further preventing leakage.

[0019] Although the present invention has been described with reference to preferred embodiments, various modifications can be made to it and components can be replaced with equivalents without departing from the scope of the present invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner as long as there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0020] In the description of this utility model, terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," which indicate direction or positional relationships, are based on the direction or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0021] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0022] The term "comprising" or any other similar term is intended to cover non-exclusive inclusion, such that a process, article, or apparatus / device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to those processes, articles, or apparatus / devices.

[0023] The technical solution of this utility model has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the protection scope of this utility model is obviously not limited to these specific embodiments. Without departing from the principle of this utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of this utility model.

Claims

1. An oil mist bearing seal, comprising an axial sleeve (1), wherein the top end of the axial sleeve (1) is configured as a limiting shoulder (11), characterized in that: The axial sleeve (1) is provided with several non-contact arc-shaped fins (2) at equal intervals, so that any two arc-shaped fins (2) form an annular groove.

2. The oil mist bearing seal according to claim 1, characterized in that: The axial sleeve (1) is also provided with two contact sealing rings (3), and the two sealing rings (3) are respectively provided on both sides of the several arc-shaped fins (2).

3. The oil mist bearing seal according to claim 2, characterized in that: The sealing ring (3) is made of composite graphite material.

4. The oil mist bearing seal according to claim 1, characterized in that: Both the axial sleeve (1) and the arc-shaped fin (2) are made of tin-phosphor bronze.

5. The oil mist bearing seal according to claim 1, characterized in that: The arc-shaped fins (2) are provided in no fewer than three.

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