A backup sealing plugging device for combined bearing of bulb tubular turbine unit

Abstract

The utility model discloses a kind of bulb tubular type unit combination bearing backup sealing plugging devices, it is related to bulb tubular type unit technical field, including bearing support ring, radial bearing seat and plugging component, the plugging component includes support pressing plate, sealing strip, sealing pressing plate and bolt, the junction of the bearing support ring with the radial bearing seat forms sealing angle, one end of the support pressing plate is connected with bolt, the side fixed connection of the bolt has sealing pressing plate, the utility model can be installed under the short-time shutdown state of unit and without disassembling equipment, without disassembling combination bearing when sealing strip failure is maintained, can quickly seal oil seepage, prevent lubricating oil loss and destroy bearing lubrication condition, avoid bearing bush wear, tile temperature rise higher and other problems;The power generation loss caused by shutdown overhaul during flood season due to oil seepage conventional treatment of this part can be avoided, and without periodically cleaning leakage oil, reduce the labor intensity of maintenance personnel.

Description

Technical Field

[0001] This utility model relates to the technical field of bulb-type turbine units, specifically a backup sealing and plugging device for the combined bearing of a bulb-type turbine unit. Background Technology

[0002] The combined bearing of a bulb turbine generator set consists of forward and reverse thrust bearings and radial bearings. The generator-side guide bearing, combined with the forward and reverse thrust bearings, can simultaneously withstand radial and axial forces. At the junction of the bearing support ring and the radial bearing housing, two rubber seals are typically designed to prevent oil leakage.

[0003] However, during actual operation, the two rubber seals mentioned above are prone to failure due to factors such as insufficient machining precision, improper installation process, defective sealing materials, or long service life. This can lead to oil leakage at the junction of the combined bearing support ring and the radial bearing housing. If the oil leakage is severe, it may force the unit to shut down. Replacing the failed seals requires disassembling the combined bearing. However, due to the structural space limitations of bulb turbine units, the operating space is extremely limited during normal operation, making it impossible to provide sufficient maintenance space. Therefore, the industry generally adopts a combined approach when replacing seals, such as during a major overhaul of the unit. However, this method of relying on major overhauls to replace seals has significant drawbacks: the preparation period for major overhauls is long, and the failure and deterioration of seals before treatment leads to increased oil leakage, which will gradually damage the lubrication conditions of thrust bearings and radial bearings, potentially causing equipment safety hazards such as bearing wear and increased bearing temperature. In order to avoid the accumulation of oil stains and the occurrence of more serious failures, maintenance personnel need to regularly collect and clean the leaked oil, which greatly increases the labor intensity. Moreover, if the oil leakage occurs during the flood season, the unit needs to operate at full load to ensure power generation. However, bulb turbine units have a complex structure, and the maintenance period is usually longer than that of other types of units of the same capacity. The shutdown for major overhaul will cause huge power generation losses, resulting in serious economic losses and adverse effects. Utility Model Content

[0004] The purpose of this utility model is to provide a backup sealing and plugging device for the combined bearing of a bulb-type turbine generator set, so as to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a backup sealing and plugging device for a bulb-type turbine combined bearing, including a bearing support ring, a radial bearing seat, and a plugging component. The plugging component includes a support plate, a sealing strip, a sealing plate, and a bolt. The connection between the bearing support ring and the radial bearing seat forms a sealing angle. The support plate is positioned at the sealing angle by a tightening mechanism. One end of the support plate is connected to a bolt, and one side of the bolt is fixedly connected to the sealing plate. The sealing strip is positioned between the sealing plate and the sealing angle.

[0006] In a preferred embodiment: the number of sealing components is several and they are distributed at equal intervals around the circumference; the cross-sectional shape of the supporting pressure plate is L-shaped; the bolts are threaded to the side wall of the supporting pressure plate; and a sealing mechanism is provided between the outer side wall of the supporting pressure plate and the bolts.

[0007] In a preferred embodiment: the sealing mechanism includes a first nut and a spring washer, the first nut being threadedly connected to a bolt, and the spring washer being disposed between the first nut and the outer wall of the supporting pressure plate.

[0008] In a preferred embodiment: the sealing strip is made of nitrile rubber material, and the cross-sectional structure of the sealing strip is O-shaped.

[0009] In a preferred embodiment: the tightening mechanism includes a tightening rod, a second nut, and a support cylinder. The bottom end of the tightening rod is fixedly connected to the support pressure plate. The second nut is threadedly connected to the tightening rod, which has a threaded groove on its outer wall. The lower end of the tightening rod is fitted with a support cylinder and is movably connected to the support cylinder. The upper end of the support cylinder is in contact with the lower end of the second nut.

[0010] In a preferred embodiment: the connection between the bearing support ring and the radial bearing seat is provided with a first sealing rubber and a second sealing rubber, respectively, and the upper end of the tightening rod is fixedly connected to one end wall of the radial bearing seat.

[0011] Compared with the prior art, the beneficial effects achieved by this utility model are: This utility model, through the setting of a support plate, sealing strip, sealing plate, bolts, and tightening mechanism, can be installed without disassembling the equipment during short-term unit shutdowns. Furthermore, it eliminates the need to disassemble the bearing assembly for maintenance when the sealing strip fails after installation. This device can quickly and effectively seal oil leaks, preventing lubricant loss and disruption of bearing lubrication conditions, thus avoiding problems such as bearing wear and overheating. It avoids the need for conventional oil leakage treatments that would lead to power generation losses during major shutdowns and overhauls during the flood season, and eliminates the need for regular cleaning of leaking oil, reducing the workload of maintenance personnel. Attached Figure Description

[0012] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the sealing and plugging device of this utility model; Figure 2 This is a top view schematic diagram of the sealing component of this utility model; Figure 3 This is a utility model Figure 2 A magnified structural diagram at point A; In the diagram: 1. Bearing support ring; 2. Radial bearing seat; 3. Support plate; 4. Sealing strip; 5. Sealing plate; 6. Bolt; 7. Sealing angle; 8. First nut; 9. Spring washer; 10. Tightening rod; 11. Second nut; 12. Support cylinder; 13. First sealing rubber; 14. Second sealing rubber. Detailed Implementation

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0014] Please see Figures 1-3 This utility model provides a technical solution: a backup sealing and plugging device for a combined bearing of a bulb-type turbine generator set, including a bearing support ring 1, a radial bearing seat 2, and a plugging component. The plugging component includes a support pressure plate 3, a sealing strip 4, a sealing pressure plate 5, and a bolt 6. The connection between the bearing support ring 1 and the radial bearing seat 2 forms a sealing angle 7. The support pressure plate 3 is set at the sealing angle 7 by a tightening mechanism. One end of the support pressure plate 3 is connected to the bolt 6, and the sealing pressure plate 5 is fixedly connected to one side of the bolt 6. The sealing strip 4 is set between the sealing pressure plate 5 and the sealing angle 7.

[0015] During installation, the upper end of the clamping rod 10 is fixedly installed on the upper wall of the radial bearing seat 2. When the original first sealing rubber 13 and second sealing rubber 14 at the junction of the bearing support ring 1 and the radial bearing seat 2 fail and leak oil, the support plate 3 of this device is clamped at the sealing angle 7 by the clamping mechanism. The O-ring nitrile rubber sealing strip 4 is placed at the sealing angle 7, and the second nut 11 is rotated clockwise. Under the action of the clamping rod 10, the second nut 11 moves downward, causing the support plate 3 to move downward until the lower end of the support plate 3 is respectively attached to the walls of the bearing support ring 1 and the radial bearing seat 2. Then, the bolt 6 is rotated to make the sealing plate 5 press the sealing strip 4 until the sealing strip 4 is in close contact with the sealing angle 7, thereby sealing the oil leakage.

[0016] The number of sealing components is several and they are distributed at equal intervals around the circumference. The cross-sectional shape of the support plate 3 is L-shaped. The L-shaped structure can better adapt to the spatial structure of the sealing angle 7 and ensure the stability of the support. The bolt 6 is threaded to the side wall of the support plate 3, which makes it easy to adjust the position of the sealing plate 5 by rotating the bolt 6, thereby pressing the sealing strip 4. A sealing mechanism is provided between the outer side wall of the support plate 3 and the bolt 6.

[0017] The sealing mechanism includes a first nut 8 and a spring washer 9. The first nut 8 is threadedly connected to the bolt 6. The spring washer 9 is located between the first nut 8 and the outer wall of the support plate 3. The first nut 8 locks the position of the bolt 6, and the spring washer 9 can prevent the bolt 6 from loosening, while enhancing the sealing performance at the connection between the bolt 6 and the support plate 3.

[0018] The sealing strip 4 is made of nitrile rubber, which has excellent oil resistance and wear resistance, making it suitable for the oil environment at the bearing. The cross-sectional structure of the sealing strip 4 is O-shaped, and the O-shaped structure has a uniform sealing contact surface, resulting in a better sealing effect.

[0019] The tightening mechanism includes a tightening rod 10, a second nut 11, and a support cylinder 12. The bottom end of the tightening rod 10 is fixedly connected to the support pressure plate 3. The second nut 11 is threadedly connected to the tightening rod 10, which has a threaded groove on its outer wall. The support cylinder 12 is sleeved on the lower end of the outer wall of the tightening rod 10 and is movably connected to the support cylinder 12. The upper end of the support cylinder 12 is in contact with the lower end of the second nut 11.

[0020] The connection between the bearing support ring 1 and the radial bearing seat 2 is provided with a first sealing rubber 13 and a second sealing rubber 14, respectively, and the upper end of the clamping rod 10 is fixedly connected to one end wall of the radial bearing seat 2.

[0021] Finally, it should be noted that: all parts not described in this utility model are the same as or can be implemented using existing technology. The above description is only a preferred embodiment of this utility model and is not intended to limit this utility model. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A backup sealing and plugging device for a combined bearing of a bulb-type turbine generator set, comprising a bearing support ring (1), a radial bearing housing (2), and a plugging component, characterized in that: The sealing component includes a support plate (3), a sealing strip (4), a sealing plate (5), and a bolt (6). The connection between the bearing support ring (1) and the radial bearing seat (2) forms a sealing angle (7). The support plate (3) is located at the sealing angle (7) by a tightening mechanism. One end of the support plate (3) is connected to a bolt (6). The sealing plate (5) is fixedly connected to one side of the bolt (6). The sealing strip (4) is located between the sealing plate (5) and the sealing angle (7).

2. The backup sealing and plugging device for the combined bearing of a bulb-type turbine generator set according to claim 1, characterized in that: The number of sealing components is several, and they are distributed at equal intervals around the circumference. The cross-sectional shape of the support plate (3) is L-shaped. The bolt (6) is threadedly connected to the side wall of the support plate (3). A sealing mechanism is provided between the outer side wall of the support plate (3) and the bolt (6).

3. The backup sealing and plugging device for the combined bearing of a bulb-type turbine generator set according to claim 2, characterized in that: The sealing mechanism includes a first nut (8) and a spring washer (9). The first nut (8) is threadedly connected to a bolt (6), and the spring washer (9) is located between the first nut (8) and the outer wall of the support plate (3).

4. The backup sealing and plugging device for the combined bearing of a bulb-type turbine generator set according to claim 3, characterized in that: The sealing strip (4) is made of nitrile rubber material, and the cross-sectional structure of the sealing strip (4) is O-shaped.

5. The backup sealing and plugging device for the combined bearing of a bulb-type turbine generator set according to claim 4, characterized in that: The tightening mechanism includes a tightening rod (10), a second nut (11), and a support cylinder (12). The bottom end of the tightening rod (10) is fixedly connected to the support pressure plate (3). The second nut (11) is threadedly connected to the tightening rod (10) which has a threaded groove on its outer wall. The support cylinder (12) is sleeved on the lower outer wall of the tightening rod (10) and is movably connected to the support cylinder (12). The upper end of the support cylinder (12) is in contact with the lower end of the second nut (11).

6. The backup sealing and plugging device for the combined bearing of a bulb-type turbine generator set according to claim 5, characterized in that: The connection between the bearing support ring (1) and the radial bearing seat (2) is provided with a first sealing rubber (13) and a second sealing rubber (14), respectively. The upper end of the top clamping rod (10) is fixedly connected to one end wall of the radial bearing seat (2).

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