Airtight mechanical seal oil shield for steam turbine

Abstract

The utility model discloses an airtight mechanical seal oil shield for a steam turbine, and relates to the technical field of steam turbine maintenance. The airtight mechanical seal oil shield for the steam turbine comprises a bearing box body and a sealing structure, a bearing is arranged in the bearing box body, the sealing structure is located in the bearing box body, the sealing structure comprises a static ring, a movable ring, a first O-shaped rubber ring, a second O-shaped rubber ring, a static ring air hole and a movable ring locking screw hole, the static ring is fixedly connected into the bearing box body, and the movable ring is fixedly connected into the bearing box body. The movable ring is connected with the static ring in a clamped mode, the static ring air hole is formed in the surface of the static ring, the movable ring locking screw hole is formed in the movable ring, and the closed air cavity is formed to prevent water from flowing into the static ring from the position of the static ring when the first O-shaped rubber ring is not sealed tightly and prevent the water from being reversely sucked into bearing box lubricating oil through negative pressure in a bearing box body. Lubricating oil in the bearing box body is prevented from leaking out, and the phenomenon that water enters the lubricating oil or the lubricating oil overflows is well prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of steam turbine maintenance, in particular to an airtight mechanical sealing oil baffle for a steam turbine. Background Art

[0002] Steam turbines are widely used and vital in thermal power plants and other occasions, so the maintenance and replacement of components to ensure the normal operation of steam turbines are equally important. The turbine bearing oil baffle is set on the front and rear ends of the bearing box to prevent the lubricating oil in the box from leaking out, and to prevent dust, water vapor and other impurities outside the box from entering the bearing box and contaminating the lubricating oil. In recent years, the existing comb-tooth seal oil baffles of steam turbines have become common problems in major power plants, such as oil leakage and water in the oil, which has seriously affected the safe operation of steam turbines and has become a stubborn problem that has plagued major power plants and manufacturers. The airtight oil baffle has become an important means to solve this problem, so there is a need for an airtight mechanical seal oil baffle for steam turbines. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art and to provide an airtight mechanical seal oil baffle for a steam turbine, which can solve the problems of oil leakage and water in the oil of the airtight oil baffle.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an airtight mechanical seal oil baffle for a steam turbine, comprising a bearing housing and a sealing structure, a bearing is arranged inside the bearing housing, the sealing structure is located inside the bearing housing, the sealing structure comprises a static ring, a dynamic ring, a first O-type rubber ring, a second O-type rubber ring, a static ring air hole and a dynamic ring locking screw hole, the static ring is fixedly connected to the inside of the bearing housing, the dynamic ring is clamped with the static ring, the static ring air hole is opened on the surface of the static ring, the dynamic ring locking screw hole is opened inside the dynamic ring, the number of the first O-type rubber ring is multiple and all are fixedly connected to the static ring, the first O-type rubber ring is evenly distributed on both sides of the static ring air hole, and the number of the second O-type rubber ring is multiple and all are fixedly connected to the dynamic ring.

[0005] Preferably, the bottom of the moving ring is fixedly connected to a rotor.

[0006] Preferably, a protrusion is provided on the stationary ring, and a groove matching the protrusion is provided on the dynamic ring.

[0007] Preferably, an airtight chamber is provided between the static ring and the dynamic ring.

[0008] Preferably, a sealed air cavity is opened inside the bearing housing.

[0009] Preferably, the number of the static ring air holes is plural and they are opened inside the static ring in a circular array.

[0010] Preferably, the number of the dynamic ring locking screw holes is multiple and they are arranged in a circular array inside the dynamic ring.

[0011] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0012] 1. For the airtight mechanical seal oil baffle for steam turbines, when the first O-ring is assembled with the cylinder block, a sealed air cavity is formed to prevent water from flowing in from the static ring when the first O-ring is not tightly sealed and to prevent the negative pressure in the bearing housing from sucking the lubricating oil in the bearing housing back. Through the positive pressure inside the oil baffle, the leakage of the lubricating oil inside the bearing housing is prevented, thus well realizing the prevention of the phenomenon of lubricating oil entering water or overflowing. The lubricating oil is thrown out through the labyrinth structure inside the oil baffle and the centrifugal force generated by rotation, blocking the outward leakage of the lubricating oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present utility model will be further described below in conjunction with the drawings and embodiments:

[0014] Figure 1 It is a schematic diagram of the body of the present utility model;

[0015] Figure 2 It is of the present utility model Figure 1 Schematic diagram at position A;

[0016] Figure 3 It is a schematic diagram of the sealing structure of the present utility model;

[0017] Figure 4 It is a schematic diagram of the static ring of the present utility model;

[0018] Figure 5 It is a schematic diagram of the dynamic ring of the present utility model.

[0019] Reference numerals: 1. Bearing housing; 2. Bearing; 3. Static ring; 4. Dynamic ring; 5. First O-ring; 6. Second O-ring; 7. Protrusion; 8. Groove; 9. Static ring air hole; 10. Air sealing chamber; 11. Dynamic ring locking screw hole; 12. Rotor; 13. Sealing air cavity. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] This part will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the drawings. The role of the drawings is to supplement the description in the text part of the specification, enabling people to intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but it cannot be understood as a limitation on the protection scope of the present utility model.

[0021] In the description of the present utility model, it should be understood that regarding the orientation description, such as the upper, lower, front, rear, left, right, etc., the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0022] In the description of the present utility model, "greater than", "less than", "exceeding", etc. are understood as not including the present number, and "above", "below", "within", etc. are understood as including the present number. If the first and second are described only for the purpose of distinguishing technical features, they cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or the sequence relationship of the indicated technical features.

[0023] In the description of the present utility model, unless otherwise clearly defined, terms such as "set", "installed", "connected", etc. should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meanings of the above terms in the present utility model in combination with the specific content of the technical solution.

[0024] Please refer to Figures 1-5 , the present utility model provides a technical solution: an airtight mechanical seal oil baffle for a steam turbine, including a bearing housing 1 and a sealing structure. A bearing 2 is provided inside the bearing housing 1, and the sealing structure is located inside the bearing housing 1. The sealing structure includes a stationary ring 3, a rotating ring 4, a first O-ring 5, a second O-ring 6, a stationary ring air hole 9, and a rotating ring locking screw hole 11. The stationary ring 3 is fixedly connected inside the bearing housing 1, the rotating ring 4 is clamped with the stationary ring 3, the stationary ring air hole 9 is opened on the surface of the stationary ring 3, the rotating ring locking screw hole 11 is opened inside the rotating ring 4. The number of the first O-rings 5 is multiple and they are all fixedly connected with the stationary ring 3. The first O-rings 5 are evenly distributed on both sides of the stationary ring air hole 9. The number of the second O-rings 6 is multiple and they are all fixedly connected with the rotating ring 4. An air sealing chamber 10 is provided between the stationary ring 3 and the rotating ring 4. A sealing air chamber 13 is opened inside the bearing housing 1. When the two first O-rings 5 on the stationary ring 3 are assembled with the cylinder block, a sealing air chamber 13 is formed to prevent water from flowing in from the stationary ring 3 and the negative pressure inside the bearing housing 1 from sucking the bearing box lubricating oil back when the first O-rings 5 are not tightly sealed. Compressed air enters the inside of the oil baffle through the circumferential air holes of the stationary ring 3. The compressed air entering the oil baffle can act evenly between the oil baffle and the shaft diameter. Through the positive pressure inside the oil baffle, water vapor and impurities outside the bearing housing 1 are isolated from entering the bearing housing 1, and at the same time, the lubricating oil inside the bearing housing 1 is prevented from leaking out. It well realizes the prevention of the phenomenon of lubricating oil entering water or lubricating oil overflowing. The rotating ring 4 and the stationary ring 3 are tightly clamped together, and the rotating ring 4 and the rotor 12 rotate simultaneously. The lubricating oil is thrown out through the labyrinth structure inside the oil baffle and the centrifugal force generated by rotation, blocking the outward leakage of the lubricating oil.

[0025] Further, a rotor 12 is fixedly connected to the bottom of the moving ring 4. A protrusion 7 is provided on the static ring 3, and a groove 8 adapted to the protrusion 7 is formed on the moving ring 4. The number of static ring air holes 9 is multiple and is arranged in a circular array inside the static ring 3. The number of moving ring locking screw holes 11 is multiple and is arranged in a circular array inside the moving ring 4.

[0026] Working principle: When the two first O-ring rubber seals 5 on the static ring 3 are assembled with the cylinder block, a sealed air cavity 13 is formed to prevent water from flowing in from the static ring 3 when the first O-ring rubber seal 5 is not tightly sealed and to prevent the negative pressure in the bearing housing 1 from sucking the lubricating oil in the bearing box back. Compressed air enters the oil baffle through the circumferential air holes on the static ring 3. The compressed air entering the oil baffle can act evenly between the oil baffle and the shaft diameter. Through the positive pressure inside the oil baffle, water vapor and impurities outside the bearing housing 1 are isolated from entering the bearing housing 1, and at the same time, the lubricating oil inside the bearing housing 1 is prevented from leaking out. It well realizes the prevention of lubricating oil from entering water or overflowing. The moving ring 4 and the static ring 3 are tightly engaged together. The moving ring 4 and the rotor 12 rotate simultaneously. The lubricating oil is thrown out through the labyrinth structure inside the oil baffle and the centrifugal force generated by the rotation, blocking the outward leakage of the lubricating oil.

[0027] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art, various changes can be made without departing from the gist of the present invention.

Claims

1. An airtight mechanical seal oil baffle for a steam turbine, characterized in that, Comprising: A bearing housing (1), with a bearing (2) provided inside the bearing housing (1); A sealing structure, located inside the bearing housing (1), the sealing structure includes a stationary ring (3), a rotating ring (4), a first O-ring (5), a second O-ring (6), a stationary ring air hole (9) and a rotating ring locking screw hole (11). The stationary ring (3) is fixedly connected inside the bearing housing (1), the rotating ring (4) is snap-connected to the stationary ring (3), the stationary ring air hole (9) is opened on the surface of the stationary ring (3), the rotating ring locking screw hole (11) is opened inside the rotating ring (4), the number of the first O-rings (5) is multiple and they are all fixedly connected to the stationary ring (3), the first O-rings (5) are evenly distributed on both sides of the stationary ring air hole (9), and the number of the second O-rings (6) is multiple and they are all fixedly connected to the rotating ring (4).

2. The airtight mechanical seal oil baffle for a steam turbine according to claim 1, characterized in that: A rotor (12) is fixedly connected to the bottom of the rotating ring (4).

3. The airtight mechanical seal oil baffle for a steam turbine according to claim 2, characterized in that: A protrusion (7) is provided on the stationary ring (3), and a groove (8) adapted to the protrusion (7) is opened on the rotating ring (4).

4. The airtight mechanical seal oil baffle for a steam turbine according to claim 3, wherein: An air sealing chamber (10) is provided between the stationary ring (3) and the rotating ring (4).

5. The airtight mechanical seal oil baffle for a steam turbine according to claim 4, characterized in that: A sealing air chamber (13) is opened inside the bearing housing (1).

6. The airtight mechanical seal oil baffle for a steam turbine according to claim 5, characterized in that: The number of the stationary ring air holes (9) is multiple and they are opened inside the stationary ring (3) in a circular array.

7. The airtight mechanical seal oil baffle for a steam turbine according to claim 6, characterized in that: The number of the rotating ring locking screw holes (11) is multiple and they are opened inside the rotating ring (4) in a circular array.

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