Split dovetail type mechanical sealing device

Abstract

The invention discloses a split dovetail type mechanical sealing device which comprises a rotating shaft, a sealing end cover, a static oil deflector ring and a movable oil deflector ring, the rotating shaft is arranged on the sealing end cover in a penetrating mode, and a sealing bell jar surrounding the periphery of the rotating shaft is arranged on the inner side of the sealing end cover; the static oil deflector ring, the movable oil deflector ring and the sealing bell jar are sequentially nested from inside to outside, a plurality of dovetail type damping oil sheds are arranged on the inner wall of the sealing bell jar, dovetail parts extending towards the two sides are arranged at the inner diameter positions of the dovetail type damping oil sheds, oil blocking ring grooves in one-to-one correspondence with the dovetail type damping oil sheds in position are formed in the outer wall of the movable oil deflector ring, and the dovetail parts extend into the oil blocking ring grooves. An oil throwing hole is formed in the outer wall of the movable oil retainer, an oil return hole is formed in the bottom of the sealing bell jar, and the oil return hole is communicated with an engine base bearing bush box oil pool. According to the split dovetail type mechanical sealing device, the problem of oil leakage of a shaft seal oil baffle caused by high oil level and high oil pressure in a bearing bush of a rotating machine is effectively solved, the problem of wear failure is avoided, and the service life is long.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical sealing devices, and in particular to a split dovetail mechanical sealing device. Background Art

[0002] Under the conditions of high oil level, high oil pressure and high speed operation in the rotor bearing, the lubricating oil will overflow in the form of steam and condense in the gap between the shaft and the bearing, causing oil leakage. This makes it very difficult to solve the sealing problem under the conditions of high oil level, high oil pressure and high speed operation. The forced contact seal can only maintain a good seal for a short time, requires frequent maintenance, and has serious shaft grinding. Summary of the invention

[0003] The technical problem to be solved by the present invention is that, in view of the defects and shortcomings of the prior art, a split dovetail mechanical sealing device is proposed, which effectively solves the oil leakage problem of the shaft seal oil baffle caused by high oil level and high oil pressure in the rotary bearing. Moreover, since axial and radial clearances are reserved between the components of the spiral mechanical sealing device when they are designed, the components of the sealing device do not rub against each other during operation, and there will be no wear and failure problems. The service life is long and the operation reliability is high.

[0004] The double-open dovetail mechanical seal device of the embodiment of the present invention comprises a rotating shaft, a sealing end cover, a static oil baffle ring and a dynamic oil baffle ring. The rotating shaft is penetrated by the sealing end cover, and a sealing bell cover is provided on the inner side of the sealing end cover, which surrounds the outer periphery of the rotating shaft. The static oil baffle ring, the dynamic oil baffle ring and the sealing bell cover are nested in sequence from the inside to the outside, the static oil baffle ring is connected with the sealing end cover, and the dynamic oil baffle ring is sleeved on the rotating shaft. The inner wall of the sealing bell cover is provided with a plurality of dovetail damping oil sheds, and the dovetail portion extending to both sides is provided at the inner diameter of the dovetail damping oil shed, and the outer wall of the dynamic oil baffle ring is provided with an oil baffle ring groove corresponding to the position of the dovetail damping oil shed, and the dovetail portion extends into the oil baffle ring groove, and the outer wall of the dynamic oil baffle ring is provided with an oil throwing hole, and the bottom of the sealing bell cover is provided with an oil return hole, and the oil return hole is connected with the oil pool of the machine base bearing box.

[0005] In the split dovetail mechanical seal device of the embodiment of the present invention, the lubricating oil will eventually flow back to the oil pool of the machine base bearing box along the dovetail damping oil shed and the oil return hole after being thrown out by the machine rotation, effectively solving the oil leakage problem of the shaft seal oil baffle caused by high oil level and high oil pressure in the rotor bearing. In addition, since axial and radial clearances are reserved between the components of the spiral mechanical seal device when they are designed, the components of the sealing device do not rub against each other during operation, and there will be no wear and failure problems. The service life is long and the operation reliability is high.

[0006] In some embodiments, there are a plurality of oil-slinging holes, and the plurality of oil-slinging holes are arranged at intervals along the circumference of the dynamic oil-slinging ring and are arranged in a plurality of rows in the axial direction of the dynamic oil-slinging ring.

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

[0008] In some embodiments, the inner wall of the sealing bell jar between the dovetail damping oil shed is provided with a V-shaped groove opening inwards.

[0009] In some embodiments, a plurality of outer oil-blocking rings are provided on the outer wall of the static oil-blocking ring, and the outer oil-blocking rings form a dynamic seal with the inner wall of the dynamic oil-blocking ring.

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

[0011] In some embodiments, the outer oil-blocking ring is a dovetail-shaped structure that is tilted.

[0012] In some embodiments, a plurality of outer oil resistance rings are provided on the inner wall of the static oil resistance ring, and the inner oil resistance rings form a dynamic seal with the outer wall of the rotating shaft.

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

[0014] In some embodiments, the sealing bell jar is detachably connected to the sealing end cap. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0016] Reference numerals:

[0017] Sealing end cover 1, static oil baffle ring 2, dynamic oil baffle ring 3, sealing bell 4, dovetail damping oil shed 5, dovetail part 6, oil baffle ring groove 7, clamping groove 8, groove 9, oil throwing hole 10, outer oil baffle ring 11, rotating shaft 12, oil return spiral line 13, oil leakage hole 14. DETAILED DESCRIPTION

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

[0019] like Figure 1As shown, the split dovetail mechanical seal device of the embodiment of the present invention comprises a rotating shaft 12, a sealing end cover 1, a static oil baffle ring 2 and a dynamic oil baffle ring 3, the rotating shaft 12 is penetrated on the sealing end cover 1, the inner side of the sealing end cover 1 is provided with a sealing bell 4 surrounding the outer periphery of the rotating shaft 12, the static oil baffle ring 2, the dynamic oil baffle ring 3 and the sealing bell 4 are nested in sequence from the inside to the outside, the static oil baffle ring 2 is connected to the sealing end cover 1, the dynamic oil baffle 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 shed 5 is provided with a dovetail portion 6 extending to both sides, the outer wall of the dynamic oil baffle ring 3 is provided with an oil baffle ring groove 7 corresponding to the position of the dovetail damping oil shed 5, the dovetail portion 6 extends into the oil baffle ring groove 7, the outer wall of the dynamic oil baffle ring 3 is provided with an oil throwing hole 10, the bottom of the sealing bell 4 is provided with an oil return hole, and the oil return hole is connected to the oil pool of the machine base bearing box.

[0020] Therefore, when the machine rotates, the lubricating oil inside the bearing shell will overflow axially to the outside of the end cover. After the lubricating oil meets the dynamic oil baffle ring 3 fixedly installed on the rotating shaft 12, due to the oil throwing hole 10 of the dynamic oil baffle ring 3, under the action of the oil throwing hole 10, the lubrication and oil pressure overflowing along the axial direction will be converted into radial oil pressure and thrown onto the inner wall of the sealing bell jar 4. The lubricating oil that falls on the inner wall of the sealing bell jar 4, under the action of the gravity of the lubricating oil itself, flows down along the inner wall of the sealing bell jar 4, falls into the dovetail portion 6 of the dovetail damping oil grid, and then flows down along the dovetail portion 6 to the bottom of the sealing bell jar 4, and flows back to the oil pool of the machine base bearing shell box through the oil return hole at the bottom of the sealing bell jar 4, forming an internal oil return system.

[0021] In the split dovetail mechanical seal device of the embodiment of the present invention, the lubricating oil will eventually flow back to the oil pool of the machine base bearing box along the dovetail damping oil shed 5 and the oil return hole after being thrown out by the machine rotation, which effectively solves the oil leakage problem of the shaft seal oil baffle caused by the high oil level and high oil pressure in the rotor bearing. In addition, since axial and radial clearances are reserved between the components of the spiral mechanical seal device during design, the components of the sealing device do not rub against each other during operation, and there will be no wear and failure problems. The service life is long and the operation reliability is high.

[0022] In some embodiments, there are multiple oil-slinging holes 10, which are arranged at intervals along the circumference of the dynamic oil-slinging ring 3 and arranged in multiple rows in the axial direction of the dynamic oil-slinging ring 3. Therefore, the multiple oil-slinging holes 10 can ensure that the lubricating oil can be evenly sling-fed to the sealing bell 4, thereby ensuring the sealing reliability.

[0023] Further, the inner wall of the sealing bell jar 4 is provided with an annular groove 8, and the dovetail type damping oil shed 5 is embedded in the annular groove 8. In other words, the sealing bell jar 4 and the dovetail type damping oil shed 5 are embedded in a detachable connection, and the two adopt a snap-fit ​​fit for easy disassembly and assembly.

[0024] Furthermore, the inner wall between the sealing bell jar 4 and the dovetail damping oil shed 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 outward expansion state, which can play a drainage role for the lubricating oil on the inner wall of the sealing bell jar 4, so that the lubricating oil can smoothly slide into the dovetail portion 6, ensuring the reliability of oil return.

[0025] In some embodiments, the outer wall of the static oil retaining 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 dynamic oil retaining ring 3. As a result, a small amount of lubricating oil enters the inner cavity of the groove of the dynamic oil retaining ring 3 along the gap between the lip of the dynamic oil retaining ring 3 and the outer oil blocking ring 11, and under the action of the static oil retaining ring 2, the lubricating oil falls to the outer cylindrical surface of the static oil retaining ring 2, and under the action of its own gravity, the lubricating oil flows along the height of the outer oil blocking ring 11 to the root of the outer cylindrical surface, and then falls into the dynamic oil retaining ring 3 along the root, and is thrown out by the oil throwing hole 10 on the dynamic oil retaining ring 3 and falls on the inner wall of the sealing bell 4, and flows back to the oil pool of the bearing box of the machine base through the oil return hole of the sealing bell 4, forming an internal oil return system.

[0026] Furthermore, an oil leakage hole 14 is provided on the bottom wall of the static oil baffle ring 2. It should be noted that a small amount of oil vapor passes through the axial gap between the lip of the static oil baffle ring 2 and the inner wall of the dynamic oil baffle ring 3, enters into the radial gap between the static oil baffle ring 2 and the rotating shaft 12 and overflows to the end cover. At this time, under the action of the static oil baffle ring 2 and the inner helix, the oil vapor is solidified and falls onto the inner wall of the static oil baffle ring 2. Under the action of 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 dynamic oil baffle ring 3 through the oil leakage hole 14 at the root of the inner wall, and then passes through the oil throwing hole 10 on the dynamic oil baffle ring 3, is thrown onto the inner wall of the sealing bell jar 4, and flows back to the oil pool of the base bearing box through the oil return hole on the inner wall of the sealing bell jar 4, forming an internal oil return system.

[0027] Preferably, the outer oil blocking ring 11 is a dovetail structure that is arranged obliquely.

[0028] Furthermore, a plurality of inner resistance oil rings are provided on the inner wall of the static oil retaining ring 2 , and the inner resistance oil rings and the outer wall of the rotating shaft 12 form a dynamic seal.

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

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

[0031] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0033] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0035] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0036] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A split dovetail mechanical seal device, characterized in that: It includes a rotating shaft, a sealing end cover, a static oil baffle ring and a dynamic oil baffle ring, the rotating shaft is penetrated by the sealing end cover, the inner side of the sealing end cover is provided with a sealing bell housing surrounding the outer periphery of the rotating shaft, the static oil baffle ring, the dynamic oil baffle ring and the sealing bell housing are nested in sequence from the inside to the outside, the static oil baffle ring is connected with the sealing end cover, the dynamic oil baffle ring is sleeved on the rotating shaft, the inner wall of the sealing bell housing is provided with a plurality of dovetail type damping oil sheds, the dovetail type damping oil shed is provided with a dovetail portion extending to both sides at the inner diameter, the outer wall of the dynamic oil baffle ring is provided with an oil baffle ring groove corresponding to the position of the dovetail type damping oil shed, the dovetail portion extends into the oil baffle ring groove, the outer wall of the dynamic oil baffle ring is provided with an oil throwing hole, the bottom of the sealing bell housing is provided with an oil return hole, and the oil return hole is connected with the oil pool of the machine base bearing box.

2. The split dovetail mechanical seal device according to claim 1, characterized in that: There are a plurality of oil-slinging holes, which are arranged at intervals along the circumference of the dynamic oil-slinging ring and are arranged in a plurality of rows in the axial direction of the dynamic oil-slinging ring.

3. The split dovetail mechanical seal device according to claim 1, characterized in that: The inner wall of the sealing bell housing is provided with an annular groove, and the dovetail damping oil shed is embedded in the annular groove.

4. The split dovetail mechanical seal device according to claim 1, characterized in that: The inner wall of the sealing bell jar between the dovetail type damping oil shed is provided with a V-shaped groove opening inwards.

5. The split dovetail mechanical seal device according to claim 1, characterized in that: The outer wall of the static oil retaining ring is provided with a plurality of outer oil retaining rings, and the outer oil retaining rings and the inner wall of the dynamic oil retaining ring form a dynamic seal fit.

6. The split dovetail mechanical seal device according to claim 5, characterized in that: An oil leakage hole is arranged on the bottom wall of the static oil retaining ring.

7. The split dovetail mechanical seal device according to claim 5, characterized in that: The outer oil-blocking ring is a dovetail-shaped structure that is arranged obliquely.

8. The split dovetail mechanical seal device according to claim 1, characterized in that: The inner wall of the static oil blocker ring is provided with a plurality of outer oil blocker rings, and the inner oil blocker rings and the outer wall of the rotating shaft form a dynamic seal.

9. The split dovetail mechanical seal device according to claim 8, characterized in that: An oil return spiral is arranged on the outer side of the inner oil resistance ring.

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

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