Guide bearing oil circulation structure of water-turbine generator set
By optimizing the oil circulation structure of guide bearings of the water turbine generator set, reducing the oil holes for pumps, increasing the oil return holes for oil spills, and setting the inclined ports of the oil spill pipes, the problem of oil-shed guide bearings at high speeds is solved, the equipment safety and stability is improved, and the amount of turbine oil is saved.
Patent Information
- Application Number
- CN202422846364.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-21
- Publication Date
- 2025-09-02
- Estimated Expiration
- 2034-11-21
AI Technical Summary
The existing water-wheel generator sets have oil-shrinking problems with guide bearings at high speeds, which leads to an increase in the stator temperature of the generator motor, a decrease in insulation level, increasing the difficulty of stator coil maintenance and environmental pollution, affecting the safe and stable operation of the equipment.
By reducing the number of oil holes for pumps, increasing the number of oil return holes, setting up the oil spill pipe and leaving a gap between the guide plate and the sliding rotor, and setting an inclined port on the oil spill pipe to optimize the oil circulation path and avoiding the accumulation of turbine oil in the upper tank and oil throwing.
Effectively avoid oil-shrinking of guide bearings, improve unit reliability, save turbine oil usage, and improve equipment safety and stable operating conditions.
Smart Images
Figure CN223293842U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the field of guide bearings of water turbine generator sets, in particular to an oil circulation structure of the guide bearings of water turbine generator sets. Background Art
[0002] The structure of existing guide bearings, such as Figure 5 As shown, it includes a sliding rotor, a lower oil tank is provided around the outer side of the sliding rotor, a cooler is provided on the bottom of the lower oil tank, an annular guide shoe support plate is provided in the lower oil tank, the inner side of the guide shoe support plate extends to the sliding rotor, a seat ring with the top extending out of the lower oil tank is provided at the outer edge of the guide shoe support plate, a plurality of circumferentially arranged guide shoes are provided at the inner edge of the guide shoe support plate, the guide shoes cooperate with the sliding rotor, the guide shoe support plate is fixed to the bottom surface of the seat ring, the upper space of the guide shoe support plate constitutes an upper oil tank, a plurality of oil pump holes are provided on the sliding rotor, the oil pump holes are connected to the upper and lower oil tanks, a plurality of oil return holes are provided on the seat ring, the return oil holes are located on the upper side of the oil pump holes, the return oil holes are connected to the upper and lower oil tanks, the return oil holes and the oil pump holes are both horizontally oriented, and an oil pan cover passed through by the sliding rotor is provided on the top of the seat ring.
[0003] When the unit is running, the hot turbine oil is cooled by the cooler, and under the action of centrifugal force, it enters the upper oil tank through the oil pump hole of the sliding rotor, and then returns to the lower oil tank through the oil return hole on the seat ring, and is cooled by the cooler again, and circulates continuously.
[0004] In practice, it was found that when the unit was running at high speed, the oil supply from the pump oil hole was greater than the oil return volume from the return oil hole. During the oil circulation process, the turbine oil in the upper oil tank could not return to the lower oil tank in time. In the existing guide bearings, the upper and lower oil tanks were both relatively small, and a large amount of turbine oil was easily accumulated in the upper oil tank. At high speed, it churned violently to form oil mist. The oil mist climbed up along the gap between the sliding rotor and the oil pan cover, causing the guide bearing to throw oil.
[0005] Oil shedding from guide bearings is a common problem in high-head, high-speed hydro-generator sets, especially pumped-storage units. This can lead to increased stator temperature, decreased insulation, increased difficulty maintaining the stator coils, and environmental pollution. This poses significant risks to equipment safety, severely impacts the safe and stable operation of the hydro-generator set, and places significant pressure on power plants regarding health and environmental management. Therefore, addressing this issue is crucial. Utility Model Content
[0006] The purpose of the utility model is to provide a guide bearing oil circulation structure for a hydro-generator set. The utility model has the advantage of preventing the guide bearing from throwing oil.
[0007] The technical solution of the utility model is: a guide bearing oil circulation structure of a hydro-turbine generator set, including a sliding rotor, a lower oil tank is provided around the outer side of the sliding rotor, an annular guide shoe support plate is provided in the lower oil tank, a seat ring with a top extending out of the lower oil tank is provided at the outer edge of the guide shoe support plate, the guide shoe support plate is fixed to the lower end of the seat ring, a plurality of circumferentially arranged guide shoes are provided at the inner edge of the guide shoe support plate, the upper space of the guide shoe support plate constitutes an upper oil tank, a plurality of oil pump holes are provided on the sliding rotor, a plurality of oil return holes are provided on the seat ring, and an oil pan cover passed by the sliding rotor is provided on the top of the seat ring, characterized in that a vertical oil overflow pipe is provided on the guide shoe support plate, the oil overflow pipe connects the upper oil tank and the lower oil tank, and the upper end of the oil overflow pipe is located between the oil pump hole and the oil return hole.
[0008] In the aforementioned guide bearing oil circulation structure of the hydro-generator set, the upper end of the oil overflow pipe is provided with an oblique opening, which faces the sliding rotor.
[0009] In the aforementioned guide bearing oil circulation structure of the hydro-generator set, the inclination angle of the bevel is 30-60°.
[0010] In the aforementioned guide bearing oil circulation structure of the hydro-generator set, the number of the oil pump holes is 7-9.
[0011] In the aforementioned guide bearing oil circulation structure of the hydro-generator set, the number of the oil return holes is 18-22.
[0012] In the aforementioned guide bearing oil circulation structure of the hydro-generator set, a gap is formed between the tile support plate and the sliding rotor.
[0013] In the aforementioned guide bearing oil circulation structure of the hydro-generator set, a cooler is provided on the bottom surface of the lower oil tank.
[0014] Compared to the prior art, the present invention reduces the number of pump oil holes, increases the number of oil return holes, adds an oil overflow pipe, and creates a gap between the guide bearing support plate and the sliding rotor. This effectively prevents excessive accumulation of turbine oil in the upper oil tank and prevents turbine oil from climbing up through the gap between the sliding rotor and the oil pan cover, causing oil throw-off at the guide bearing. This not only increases unit reliability but also saves on turbine oil usage. Therefore, the present invention has the advantage of preventing oil throw-off at the guide bearing.
[0015] In addition, the utility model is particularly suitable for the transformation of existing guide bearings. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a structural diagram of the present utility model.
[0017] Figure 2 This is a schematic diagram of blocking some of the oil pump holes.
[0018] Figure 3This is a computer-simulated diagram of oil flow when there is no bevel at the upper end of the oil overflow pipe.
[0019] Figure 4 This is a computer-simulated diagram of oil flow when there is an oblique opening at the upper end of the oil overflow pipe.
[0020] Figure 5 It is a structural diagram of the existing guide bearing oil circulation structure.
[0021] The marks in the accompanying drawings are: 1-sliding rotor, 2-lower oil tank, 3-guide shoe support plate, 4-seat ring, 5-upper oil tank, 6-pump oil hole, 7-oil return hole, 8-oil pan cover, 9-oil overflow pipe, 10-bevel, 11-gap, 12-cooler, 13-guide shoe, 14-plug. DETAILED DESCRIPTION
[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments, but they are not intended to limit the present invention.
[0023] Comparative Example. The existing guide bearing oil circulation structure of the turbine generator set, the guide bearing is used as the lower guide bearing in the No. 1 generator set of Huilong Pumped Storage Power Plant. The No. 1 generator set is produced by Harbin Electric Motor Factory Co., Ltd., model SFD60-8 / 3800. Figure 5 As shown, it includes a sliding rotor 1, a lower oil tank 2 is provided around the outer side of the sliding rotor 1, a cooler 12 is provided on the bottom surface of the lower oil tank 2, an annular guide shoe support plate 3 is provided in the lower oil tank 2, the inner side of the guide shoe support plate 3 extends to the sliding rotor 1, a seat ring 4 with the top extending out of the lower oil tank 2 is provided at the outer edge of the guide shoe support plate 3, and a plurality of guide shoes 13 uniformly arranged in the circumferential direction are provided at the inner edge of the guide shoe support plate. The guide shoes 13 do not contact each other, and the guide shoes 13 cooperate with the sliding rotor 1. The guide shoe support plate 3 is fixed to the bottom surface of the seat ring 4, and the upper space of the guide shoe support plate 3 constitutes an upper oil tank 5. The sliding rotor 1 is equipped with 12 circumferentially distributed oil pumping holes 6, which connect to the upper and lower oil tanks 2. The seat ring 4 is equipped with 10 circumferentially distributed oil return holes 7, located above the oil pumping holes 6. The oil return holes 7 connect to the upper and lower oil tanks 2. The oil return holes 7 and the oil pumping holes 6 are both horizontal. The top of the seat ring 4 is equipped with an oil pan cover 8, which is passed through by the sliding rotor 1. The upper oil tank 5 is surrounded by the sliding rotor 1, the guide shoe support plate 3, the seat ring 4, and the oil pan cover 8.
[0024] When the unit is running, the hot turbine oil is cooled by the cooler 12, and then enters the upper oil tank 5 through the oil pump hole 6 of the sliding rotor 1 under the action of centrifugal force, and then returns to the lower oil tank 2 through the oil return hole 7 on the seat ring 4, and is cooled again by the cooler 12, and circulates continuously.
[0025] When the unit is running, the guide shoe 13 is fixed to the seat ring 4 and is rotationally connected to the sliding rotor 1.
[0026] Embodiment. A guide bearing oil circulation structure of a hydro-generator set is improved on the basis of the existing guide bearing oil circulation structure of a hydro-generator set in the comparative example. The improved structure is as follows: Figure 1 As shown, the improvements are as follows:
[0027] First, the number of the oil pump holes 6 is reduced from 12 to 8. That is, a portion of the oil pump holes 6 is blocked, and the blocked oil pump holes 6 are preferably evenly distributed in the circumference. The specific blocking method is as follows: Figure 2 As shown, a plug 14 is welded in the oil pump hole 6. The material of the plug 14 is the same as that of the sliding rotor 1. After the plugging is completed, the plug 14 shall not exceed the outer peripheral surface of the sliding rotor 1. By plugging part of the oil pump hole 6, the oil pumping amount is reduced.
[0028] Second, the number of oil return holes 7 is increased from 10 to 20.
[0029] Third, 10 vertical oil overflow pipes 9 are set on the guide shoe support plate 3. The oil overflow pipes 9 are evenly distributed around the circumference. The oil overflow pipes 9 connect the upper oil tank 5 and the lower oil tank 2. The upper end of the oil overflow pipe 9 is located between the oil pump hole 6 and the oil return hole 7. The upper end of the oil overflow pipe 9 is provided with an oblique opening 10 facing the sliding rotor 1. The inclination angle of the oblique opening 10 is 30-60 degrees, that is, the angle between the plane where the oblique opening 10 is located and the horizontal plane is 30-60 degrees. Figure 3 and Figure 4 It can be seen from the comparison that the oblique opening 10 arranged on the overflow pipe 9 toward the sliding rotor 1 is more conducive to oil circulation, promoting the oil in the upper oil tank 5 to return to the lower oil tank 2. When the oil in the upper oil tank 5 accumulates to a certain level, it can also enter the lower oil tank 2 through the overflow pipe 9.
[0030] Fourth, a gap 11 is provided between the guide shoe support plate 3 and the sliding rotor 1 , so that part of the oil in the upper oil tank 5 can flow back to the lower oil tank 2 through the gap 11 .
[0031] After the above improvements, Figure 1 As shown, turbine oil from lower tank 2 enters upper tank 2 through pump oil hole 6, which is oil path Q1. Turbine oil from upper tank 5 can enter lower tank 2 through gap 11 (oil path Q2), through overflow pipe 9 (oil path Q3), or through oil return hole 7 (oil path Q4).
[0032] As shown in Table 1, the relevant design parameters of the improved guide bearing oil circulation structure are shown.
[0033] Table 1
[0034]
Claims
1. A guide bearing oil circulation structure for a hydro-turbine generator set, comprising a sliding rotor (1), a lower oil tank (2) arranged around the outer side of the sliding rotor (1), an annular guide shoe support plate (3) arranged in the lower oil tank (2), a seat ring (4) with a top extending out of the lower oil tank (2) provided at the outer edge of the guide shoe support plate (3), the guide shoe support plate (3) being fixed to the lower end of the seat ring (4), a plurality of guide shoes (13) arranged circumferentially provided at the inner edge of the guide shoe support plate (3), an upper oil tank (5) formed by the upper space of the guide shoe support plate (3), a plurality of oil pump holes (6) provided on the sliding rotor (1), a plurality of oil return holes (7) provided on the seat ring (4), an oil pan cover (8) passed through by the sliding rotor (1) provided on the top of the seat ring (4), characterized in that: A vertical oil overflow pipe (9) is provided on the guide shoe support plate (3), the oil overflow pipe (9) is connected to the upper oil tank (5) and the lower oil tank (2), and the upper end of the oil overflow pipe (9) is located between the oil pump hole (6) and the oil return hole (7).
2. The guide bearing oil circulation structure of the hydro-generator set according to claim 1 is characterized in that: The upper end of the oil overflow pipe (9) is provided with an oblique opening (10), and the oblique opening (10) faces the sliding rotor (1).
3. The guide bearing oil circulation structure of the hydro-generator set according to claim 2, characterized in that: The inclination angle of the oblique opening (10) is 30-60°.
4. The guide bearing oil circulation structure of a hydro-generator set according to claim 1, characterized in that: The number of the oil pump holes (6) is 7-9.
5. The guide bearing oil circulation structure of a hydro-generator set according to claim 1, characterized in that: The number of the oil return holes (7) is 18-22.
6. The guide bearing oil circulation structure of a hydro-generator set according to claim 1, characterized in that: A gap (11) is formed between the tile support plate and the sliding rotor (1).
7. The guide bearing oil circulation structure of a hydro-generator set according to claim 1, characterized in that: A cooler (12) is provided on the bottom surface of the lower oil tank (2).