Split dovetail type mechanical sealing device

Abstract

A split dovetail type mechanical sealing device, comprising a rotating shaft (12), a sealing end cover (1), a stationary oil retaining ring (2), and a movable oil retaining ring (3). The rotating shaft (12) passes through the sealing end cover (1); a sealing bell cover (4) surrounding the periphery of the rotating shaft (12) is provided on the inner side of the sealing end cover (1); the stationary oil retaining ring (2), the movable oil retaining ring (3), and the sealing bell cover (4) are sequentially nested from inside to outside; a plurality of dovetail type damping oil recesses (5) are provided on the inner wall of the sealing bell cover (4); a dovetail portion (6) extending to two sides is provided at the inner diameter of each dovetail type damping oil recess (5); the outer wall of the movable oil retaining ring (3) is provided with oil retaining ring grooves (7) in a one-to-one correspondence to the dovetail type damping oil recesses (5) in position; the dovetail portions (6) extend into the oil retaining ring grooves (7); oil throwing holes (10) are formed in the outer wall of the movable oil retaining ring (3); an oil return hole is formed at the bottom of the sealing bell cover (4); and the oil return hole is communicated with a seat bearing shell box oil sump.

Description

Split-type dovetail mechanical seal device Technical Field

[0001] This invention relates to the field of mechanical seal technology, and more specifically, to a split-type dovetail mechanical seal. Background Technology

[0002] Under conditions of high oil level, high oil pressure, and high speed operation, lubricating oil will overflow as vapor and condense at the gap between the shaft and the bearing, causing oil leakage. This makes solving the sealing problem under high oil level, high oil pressure, and high speed operation conditions extremely difficult. Forced contact seals can only maintain a good seal for a short time, require frequent maintenance, and suffer from severe shaft wear. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to address the defects and deficiencies of the prior art by proposing a split-type dovetail mechanical seal device. This split-type dovetail mechanical seal device effectively solves the problem of oil leakage caused by high oil level and high oil pressure in the rotating bearing. Furthermore, since the components of the spiral mechanical seal device are designed with axial and radial clearances, the components do not rub against each other during operation, and there will be no wear failure. It has a long service life and high operational reliability.

[0004] The split-type dovetail mechanical seal device of this invention includes a rotating shaft, a sealing end cover, a stationary oil retainer ring, and a dynamic oil retainer ring. The rotating shaft passes through the sealing end cover, and a sealing bell shroud surrounding the outer circumference of the rotating shaft is provided inside the sealing end cover. The stationary oil retainer ring, the dynamic oil retainer ring, and the sealing bell shroud are nested sequentially from the inside to the outside. The stationary oil retainer ring is connected to the sealing end cover, and the dynamic oil retainer ring is sleeved on the rotating shaft. The inner wall of the sealing bell shroud is provided with a plurality of dovetail-type damping oil septa. The inner diameter of each dovetail-type damping oil septa is provided with dovetail portions extending to both sides. The outer wall of the dynamic oil retainer ring is provided with oil-blocking ring grooves corresponding to the positions of the dovetail-type damping oil septa. The dovetail portions extend into the oil-blocking ring grooves. The outer wall of the dynamic oil retainer ring is provided with an oil-throwing hole. The bottom of the sealing bell shroud is provided with an oil return hole, which communicates with the oil sump of the machine base bearing housing.

[0005] In the split-type dovetail mechanical seal device of this invention, the lubricating oil, after being thrown out during machine rotation, will eventually flow back to the oil sump of the machine base bearing housing along the dovetail damping oil sump and the oil return hole. This effectively solves the problem of oil leakage caused by high oil level and high oil pressure in the machine bearing housing. Furthermore, since the components of the spiral mechanical seal device are designed with axial and radial clearances, the components do not rub against each other during the operation of the seal device, and there will be no wear failure. It has a long service life and high operational reliability.

[0006] In some embodiments, there are multiple oil slinger holes, which are arranged at circumferential intervals along the moving oil baffle ring and in multiple rows along the axial direction of the moving oil baffle ring.

[0007] In some embodiments, the inner wall of the sealed bell jar is provided with an annular groove, and the dovetail damping oil sump is embedded in the annular groove.

[0008] In some embodiments, the sealing bell jar has an inwardly opening V-shaped groove on the inner wall between the dovetail damping oil chambers.

[0009] In some embodiments, the outer wall of the stationary oil baffle ring is provided with a plurality of outer oil baffle rings, and the outer oil baffle rings and the inner wall of the moving oil baffle ring form a dynamic sealing fit.

[0010] In some embodiments, the bottom wall of the static oil baffle ring is provided with an oil leakage hole.

[0011] In some embodiments, the external oil-blocking ring is an inclined dovetail-shaped structure.

[0012] In some embodiments, the inner wall of the static oil ring is provided with a plurality of outer oil-blocking rings, and the inner oil-blocking ring forms a dynamic sealing fit with the outer wall of the rotating shaft.

[0013] In some embodiments, the outer side of the internal resistance oil ring is provided with an oil return spiral.

[0014] In some embodiments, the sealing bell jar is detachably connected to the sealing end cap. Attached Figure Description

[0015] Figure 1 is a schematic diagram of the structure of the split-type dovetail mechanical seal device according to an embodiment of the present invention.

[0016] Figure label:

[0017] 1. Sealed end cap, 2. Static oil baffle ring, 3. Dynamic oil baffle ring, 4. Sealed bell jar, 5. Dovetail damping oil sump, 6. Dovetail part, 7. Oil baffle ring groove, 8. Slot, 9. Groove, 10. Oil slinger hole, 11. External oil baffle ring, 12. Rotating shaft, 13. Oil return spiral line, 14. Oil leakage hole. Detailed Implementation

[0018] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0019] As shown in Figure 1, the split-type dovetail mechanical seal device of this invention includes a rotating shaft 12, a sealing end cover 1, a stationary oil retaining ring 2, and a moving oil retaining ring 3. The rotating shaft 12 passes through the sealing end cover 1. The inner side of the sealing end cover 1 is provided with a sealing bell 4 surrounding the outer circumference of the rotating shaft 12. The stationary oil retaining ring 2, the moving oil retaining ring 3, and the sealing bell 4 are nested sequentially from the inside to the outside. The stationary oil retaining ring 2 is connected to the sealing end cover 1, and the moving oil retaining ring 3 is sleeved on the rotating shaft 12. The inner wall of the sealing bell 4 is provided with a plurality of dovetail damping oil sheds 5. The inner diameter of the dovetail damping oil sheds 5 is provided with dovetail portions 6 extending to both sides. The outer wall of the moving oil retaining ring 3 is provided with oil-blocking ring grooves 7 corresponding one-to-one with the positions of the dovetail damping oil sheds 5. The dovetail portions 6 extend into the oil-blocking ring grooves 7. The outer wall of the moving oil retaining ring 3 is provided with an oil-throwing hole 10. The bottom of the sealing bell 4 is provided with an oil return hole, which is connected to the oil sump of the machine base bearing housing.

[0020] Therefore, when the machine rotates, the lubricating oil inside the bearing bush will overflow axially towards the outside of the end cover. When the lubricating oil encounters the moving oil ring 3 fixedly installed on the rotating shaft 12, due to the oil throwing hole 10 of the moving oil ring 3, the lubricating oil overflowing axially will be transformed into radial oil pressure and thrown onto the inner wall of the sealing bell 4. The lubricating oil falling onto the inner wall of the sealing bell 4 will flow down along the inner wall of the sealing bell 4 under its own gravity, falling into the dovetail part 6 of the dovetail damping oil grid, and then flowing down along the dovetail part 6 to the bottom of the sealing bell 4. Through the oil return hole at the bottom of the sealing bell 4, it flows back to the oil sump of the machine base bearing bush box, forming an internal oil return system.

[0021] In the split-type dovetail mechanical seal device of this invention, after the lubricating oil is thrown out during machine rotation, it will eventually flow back to the oil sump of the machine base bearing housing along the dovetail damping oil sump 5 and the oil return hole. This effectively solves the problem of oil leakage caused by high oil level and high oil pressure in the machine bearing housing. In addition, since the components of the spiral mechanical seal device are designed with axial and radial clearances, the components do not rub against each other during the operation of the sealing device, and there will be no wear failure problem. It has a long service life and high operational reliability.

[0022] In some embodiments, there are multiple oil slinger holes 10, which are arranged at intervals along the circumference of the moving oil baffle ring 3 and in multiple rows along the axial direction of the moving oil baffle ring 3. Thus, the multiple oil slinger holes 10 can ensure that the lubricating oil can be evenly thrown towards the sealing bell 4, ensuring sealing reliability.

[0023] Furthermore, the inner wall of the sealed bell jar 4 is provided with an annular groove 8, and the dovetail damping oil sump 5 is embedded in the annular groove 8. In other words, the sealed bell jar 4 and the dovetail damping oil sump 5 are detachably connected, and the two adopt a snap-fit ​​engagement that is easy to install and remove.

[0024] Furthermore, the inner wall of the sealing bell jar 4 between the dovetail damping oil chamber 5 is provided with an inwardly opening V-shaped groove 9. It can be understood that the inner wall of the V-shaped groove 9 is in an outwardly expanding state, which can guide the lubricating oil on the inner wall of the sealing bell jar 4, so that the lubricating oil can smoothly slide into the dovetail part 6, ensuring the reliability of oil return.

[0025] In some embodiments, the outer wall of the stationary oil ring 2 is provided with a plurality of outer oil blocking rings 11, and the outer oil blocking rings 11 form a dynamic seal with the inner wall of the moving oil ring 3. As a result, a small portion of the lubricating oil enters the inner cavity of the groove of the moving oil ring 3 along the gap between the lip of the moving oil ring 3 and the outer oil blocking rings 11. Under the action of the stationary oil ring 2, the lubricating oil falls onto the outer circumferential surface of the stationary oil ring 2. Under its own gravity, the lubricating oil flows along the high point of the outer oil blocking rings 11 to the root of the outer circumferential surface, and then falls into the moving oil ring 3 along the root. It is then thrown out through the oil throwing hole 10 on the moving oil ring 3 and falls onto the inner wall of the sealing bell 4. It then flows back to the oil sump of the machine base bearing box through the oil return hole of the sealing bell 4, forming an internal oil return system.

[0026] Furthermore, the bottom wall of the stationary oil ring 2 is provided with an oil leakage hole 14. It should be noted that a small amount of oil vapor enters the radial gap between the stationary oil ring 2 and the rotating shaft 12 through the axial gap between the lip of the stationary oil ring 2 and the inner wall of the moving oil ring 3, and overflows towards the end cover. At this time, under the action of the stationary oil ring 2 and the inner spiral, the oil vapor is condensed and falls onto the inner wall of the stationary oil ring 2. Under its own gravity, the lubricating oil flows along the high point of the inner wall surface to the root of the inner wall, and falls into the moving oil ring 3 through the oil leakage hole 14 at the root of the inner wall. Then, through the oil throwing hole 10 on the moving oil ring 3, it is thrown onto the inner wall of the sealing bell 4, and flows back to the oil sump of the bearing housing through the oil return hole on the inner wall of the sealing bell 4, forming an internal oil return system.

[0027] Preferably, the outer oil-blocking ring 11 is an inclined dovetail-shaped structure.

[0028] Furthermore, the inner wall of the static oil ring 2 is provided with several internal resistance oil rings, which form a dynamic sealing fit with the outer wall of the rotating shaft 12.

[0029] Furthermore, an oil return spiral 13 is provided on the outer side of the inner resistance oil ring.

[0030] Furthermore, the sealing bell jar 4 is detachably connected to the sealing end cap 1.

[0031] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0033] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0034] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0035] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0036] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A split-type dovetail mechanical seal device, characterized in that, The device includes a rotating shaft, a sealing end cover, a stationary oil retainer ring, and a moving oil retainer ring. The rotating shaft passes through the sealing end cover, and a sealing bell shroud surrounds the rotating shaft on the inner side of the sealing end cover. The stationary oil retainer ring, the moving oil retainer ring, and the sealing bell shroud are nested sequentially from the inside to the outside. The stationary oil retainer ring is connected to the sealing end cover, and the moving oil retainer ring is fitted onto the rotating shaft. The inner wall of the sealing bell shroud has several dovetail-shaped damping oil sumps, and each dovetail-shaped damping oil sump has a dovetail portion extending to both sides at its inner diameter. The outer wall of the moving oil retainer ring has oil-blocking ring grooves corresponding to the positions of the dovetail-shaped damping oil sumps, and the dovetail portion extends into the oil-blocking ring groove. The outer wall of the moving oil retainer ring has an oil-throwing hole, and the bottom of the sealing bell shroud has an oil return hole, which communicates with the oil sump of the machine base bearing housing.

2. The split-type dovetail mechanical seal device according to claim 1, characterized in that, There are multiple oil-throwing holes, which are arranged at intervals along the circumference of the moving oil baffle ring and in multiple rows along the axial direction of the moving oil baffle ring.

3. The split-type dovetail mechanical seal device according to claim 1, characterized in that, The inner wall of the sealed bell jar is provided with an annular groove, and the dovetail damping oil sump is embedded in the annular groove.

4. The split-type dovetail mechanical seal device according to claim 1, characterized in that, The sealed bell jar has an inwardly opening V-shaped groove on the inner wall between the dovetail-shaped damping oil chambers.

5. The split-type dovetail mechanical seal device according to claim 1, characterized in that, The outer wall of the stationary oil baffle ring is provided with several outer oil baffle rings, and the outer oil baffle rings form a dynamic sealing fit with the inner wall of the moving oil baffle ring.

6. The split-type dovetail mechanical seal device according to claim 5, characterized in that, The bottom wall of the static oil ring is provided with an oil leakage hole.

7. The split-type dovetail mechanical seal device according to claim 5, characterized in that, The external oil-blocking ring is an inclined dovetail-shaped structure.

8. The split-type dovetail mechanical seal device according to claim 1, characterized in that, The inner wall of the static oil retaining ring is provided with several outer oil blocking rings, and the inner oil blocking ring forms a dynamic sealing fit with the outer wall of the rotating shaft.

9. The split-type dovetail mechanical seal device according to claim 8, characterized in that, The outer side of the internal resistance oil ring is provided with an oil return spiral.

10. The split-type dovetail mechanical seal device according to claim 1, characterized in that, The sealing bell jar is detachably connected to the sealing end cap.

Images