Bearing oil mist treatment system for vertical hydro-generator

Abstract

The utility model discloses a vertical hydro-generator bearing oil mist treatment system, which relates to the technical field of hydro-generators, and comprises an oil mist isolation device, an oil mist treatment device and an oil recharging tank, the oil mist isolation device comprises a main oil shield seal and a vertical ring seal fixed on the main oil shield seal, the end, close to the motor rotating shaft, of the main oil shield seal is provided with a brush seal and at least one sealing tooth, the other end of the main oil shield seal is fixedly connected with the oil groove, the motor rotating shaft, a rotor support on the motor rotating shaft, the vertical ring seal and the main oil shield seal on one side of the vertical ring seal define a sealing cavity, and the main oil shield seal is provided with a suction hole. One end of the oil supplementing oil tank is connected with the oil mist treatment device through a connecting pipe, and the other end of the oil supplementing oil tank is communicated with the oil groove through an oil supplementing pipe. According to the utility model, oil mist can be effectively prevented from escaping, threats to an insulation system of a unit are reduced, the safety is improved, pollution is reduced, the oil level descending speed of lubricating oil in the oil groove can be reduced, and the external oil supplementing frequency is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to water turbine generator technology field, concretely relates to a vertical water turbine generator bearing oil mist processing system. BACKGROUND

[0002] Water turbine generator unit is big in diameter and heavy in load, so oil lubrication sliding bearing is mostly used. A large amount of oil mist is generated in the bearing oil groove during the operation of the unit, and the main sources of the oil mist are: a) oil in agitation state, which collides with the components in the oil groove continuously, and the collision process generates oil mist; b) oil bubble explosion, which generates oil mist; c) oil temperature rise, which generates oil mist due to gasification of lubricating oil. If the oil mist cannot be effectively prevented and overflowed from the oil groove, it will cause pollution to the unit environment and may pose a threat to the insulation system of the unit.

[0003] Therefore, the general prior art scheme sets a sealing cover structure and an oil mist filtering and processing system for blocking oil mist at the bearing of the water turbine generator. However, the effect of most prior art schemes is not ideal, especially the oil mist machine extracts a large amount of oil mist, which causes oil pollution in the pit or workshop, causes the oil level in the oil groove to drop rapidly, and oil must be frequently supplemented.

[0004] Chinese patent document with publication number CN105674036A and publication date of June 15, 2016 discloses a water turbine generator bearing oil groove oil mist collecting method and oil mist collecting device, which comprises: a semi-closed oil mist absorption space is set up outside the bearing oil groove to form a mixed channel for extracting oil mist and air, and to realize effective collection of only the oil mist overflowed from the oil groove while releasing the pressure of the bearing oil groove; the oil mist collecting device comprises a water turbine generator bearing oil groove cover plate oil mist discharge hole, a suction cavity cover body is buckled in the upper space of the oil mist discharge hole to form a semi-open oil mist and air mixing cavity, the suction cavity cover body is fixed to the water turbine generator bearing oil groove cover plate through a flange, an air inlet, an oil mist suction inlet and a suction port are arranged on the suction cavity cover body, the suction port is communicated with an oil mist purification device through a connecting hose, and the semi-open oil mist and air mixing cavity of the oil mist collecting device can treat and separate the oil mist overflowed from the water turbine generator bearing oil groove.

[0005] However, the above technical solution, by setting up the oil mist and air mixing cavity, and setting up the air inlet on the cavity, firstly, there is the risk of uneven fan load and unstable pressure; secondly, the external air sucked in and mixed with the oil mist enters the oil mist purification device, which greatly increases the load of the oil mist purification device, reduces the oil mist purification efficiency and waste oil recovery capacity, and cannot effectively recover and purify waste oil; there is settled waste oil in the oil mist and air mixing cavity of the technical solution, and this part of waste oil does not set up a collection device, which may leak out and pollute the unit or block the air inlet; if the fan air volume is not properly set, it will increase the path of oil mist overflow; finally, the technical solution still needs frequent external oil supplement.

[0006] The utility model discloses a kind of semi-umbrella type water turbine generator unit bearing sealing oil mist automatic recovery device, including rotating shaft;Oil groove is arranged on the rotating shaft, the lubricating oil collected in the oil collection tank in the automatic recovery device of the utility model uses self gravity natural backflow to oil groove, to reduce complex oil return pipeline and the link of oil pump, structure is relatively simpler, facilitate installation;Oil return process can also be in real time, compared with the structure of backflow using oil pump, this sealing mode can real-time circulation lubricating oil, completely avoid the lack of oil phenomenon generated by oil groove due to dredging sealing mode;On the reverse helical sealing, increase a gapless auxiliary sealing, ensure that sealing surface and shaft have no gap, to prevent dust outside oil groove or oil mist possibly escaped from inside oil groove to pass through, further strengthen sealing effect.

[0007] However, the above technical solution, relies on sealing design and structure to realize the collection and backflow of oil mist without the ability of deep purification of oil mist, on the one hand, the oil mist collection capacity is limited, and the fundamental reason for oil mist overflow is not improved; balance the air pressure difference inside and outside the oil groove; it is impossible to deeply recover small oil mist particles, on the other hand, the traditional contact sealing is adopted, the sealing life is short and easy to fail, and impurities may exist after oil recovery and utilization, thereby causing damage to the rotating shaft. Utility model content

[0008] To solve the above technical problems, the utility model provides a vertical water turbine generator bearing oil mist treatment system, which can effectively reduce oil mist escape, reduce the threat to the insulation system of the unit, improve safety and reduce pollution, while reducing the oil level drop speed of the lubricating oil in the oil groove and reducing the number of external oil supplement.

[0009] The utility model is implemented by adopting the following technical solutions:

[0010] A vertical water turbine generator bearing oil mist treatment system, comprising an oil mist isolation device, an oil mist treatment device and an oil supplement tank, the oil mist isolation device comprises a main oil baffle seal and a vertical ring seal fixed on the main oil baffle seal, the main oil baffle seal is provided with a brush seal and at least one sealing tooth near one end of the motor rotating shaft, and the other end is fixedly connected with an oil groove; the motor rotating shaft, a rotor support on the motor rotating shaft and the main oil baffle seal on the other side of the vertical ring seal form a sealed cavity; the main oil baffle seal on the other side of the vertical ring seal is provided with a suction hole; the oil mist treatment device is connected with the suction hole through a suction pipe; one end of the oil supplement tank is connected with the oil mist treatment device through a connecting pipe, and the other end is communicated with the oil groove through an oil supplement pipe; the oil mist treatment device comprises a suction module for sucking oil mist, a separation module for separating waste oil in the oil mist, a waste oil recovery module for collecting the separated waste oil and a waste oil purification module for purifying the waste oil which are connected in sequence.

[0011] One end of the suction hole of the main oil baffle seal is connected with the oil mist suction and discharge pipe flange, and the other end is provided with a labyrinth pipe for increasing the overflow path of the oil mist.

[0012] The labyrinth pipe is a spiral pipe or a multiple folding pipe.

[0013] The oil supplement pipe is provided with an oil supplement control valve.

[0014] A mechanical float valve is arranged at the communication position of the oil supplement pipe and the oil groove.

[0015] The suction module is a variable frequency fan.

[0016] The separation module is an electrostatic adsorber, a cyclone separator or a condensing unit.

[0017] The waste oil recovery module and the oil supplement tank are storage tanks with pumping function.

[0018] The waste oil purification module is a mechanical filter, a centrifugal separator or a high-precision electrostatic filter unit, and is arranged between the waste oil recovery module and the oil supplement tank.

[0019] A return spring is arranged between the sealing tooth and the main oil baffle seal.

[0020] The gap between the sealing tooth and the rotating shaft is not less than the guide bush gap, and the brush of the brush seal is in contact with the rotating shaft.

[0021] Compared with the prior art, the advantages of the utility model are shown in:

[0022] 1. The utility model discloses a oil mist treatment system which is composed of a rotating shaft, a main oil baffle seal, a vertical ring seal and an oil tank. The oil mist treatment system can effectively control the oil mist leakage in the bearing area, avoid environmental pollution and prolong the service life of the equipment. A sealed cavity is formed between the main oil baffle seal and the rotating shaft and the rotor support, which can greatly reduce the air pressure at the brush seal structure, thereby preventing the brush seal from being affected by the negative pressure of the rotor cooling air and ensuring that the oil mist is completely sealed in the oil tank. The risk of oil mist leakage is further reduced, and the sealing performance of the lubricating oil is ensured. Meanwhile, the brush seal structure has soft and dense bristles and good self-sealing performance. The friction between the brush and the rotating part is small, and the shaft will not be deformed unevenly due to eccentric wear. The oil mist purification device is connected to the oil supplement tank to reduce the emission of oil mist and recycle the purified waste oil.

[0023] 2. The utility model discloses a labyrinth pipe is arranged in the suction hole, which increases the overflow path of the oil mist, slows down the flow rate of the oil mist and improves the adsorption efficiency of the oil mist, and improves the oil mist separation effect.

[0024] 3. The utility model discloses a mechanical float valve is arranged at the end of the oil supplement pipe in the oil tank, which can automatically open or close the oil supplement function according to the oil level, prevent over-supplement or insufficient supplement of oil, avoid operation errors of the oil supplement control valve and ensure stable operation of the system.

[0025] 4. The utility model discloses an oil mist treatment device which is composed of an oil absorption module, an oil mist treatment module, a waste oil recovery module and a waste oil purification module. The oil mist is treated in steps, the oil mist is first absorbed, then the waste oil is separated, then the waste oil is purified, and finally the oil is supplemented into the oil tank. The oil level can be prevented from dropping too fast, and the exhaust gas of the oil mist machine can be prevented from causing serious pollution to the pit and the factory building.

[0026] 5. The utility model discloses that the cooperation of the sealing teeth and the return spring can ensure the reliability of the sealing effect, reduce the oil mist leakage, the gap between the sealing teeth and the main oil baffle seal is designed to be not less than the gap between the guide shoes, which ensures the tightness and long-term stability of the system. The brush seal further improves the sealing performance by the contact between the brush and the rotating shaft, avoids the oil mist leakage, enhances the durability and sealing effect of the sealing part and ensures the safe operation of the whole system. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a structural arrangement diagram of the utility model;

[0028] Markings in the figure:

[0029] 1, main oil seal; 2, vertical ring seal; 3, suction pipe; 4, oil mist treatment device; 5, oil supplement tank; 6, oil supplement control valve; 7, oil supplement pipe; 8, mechanical float valve; 9, motor shaft; 10, rotor support; 11, brush seal; 12, sealing tooth; 13, sealing cavity; 14, suction hole; 15, connecting pipe; 16, labyrinth pipe; 17, oil tank; 18, air pressure sensor. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the utility model will be described below in a clear and complete manner. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0031] Embodiment 1

[0032] As the most basic embodiment of the utility model, refer to Figure 1 A vertical hydro-generator bearing oil mist treatment system, comprising an oil mist isolation device, an oil mist treatment device 4 and an oil supplement tank 5, the oil mist isolation device comprises a main oil seal 1 and a vertical ring seal 2 fixed on the main oil seal 1, the main oil seal 1 is provided with a brush seal 11 and at least one sealing tooth 12 near one end of the motor shaft 9, and the other end is fixedly connected with the oil tank 17, the motor shaft 9, the rotor support 10 on the motor shaft 9 and the main oil seal 1 on one side of the vertical ring seal 2 form a sealing cavity 13, the main oil seal 1 on the other side of the vertical ring seal 2 is provided with a suction hole 14, the oil mist treatment device 4 is connected with the suction hole 14 through the suction pipe 3, one end of the oil supplement tank 5 is connected with the oil mist treatment device 4 through the connecting pipe 15, and the other end is communicated with the oil tank 17 through the oil supplement pipe 7, the oil mist treatment device 4 comprises a suction module for sucking oil mist, a separation module for separating waste oil in the oil mist, a waste oil recovery module for collecting the separated waste oil and a waste oil purification module for purifying the waste oil, which are connected in sequence.

[0033] In this embodiment, the oil mist treatment device 4 and the oil supplement tank 5 are designed integrally, combined with an efficient sealing system and an oil mist recovery mechanism, which can effectively collect, purify and transport the oil mist back to the oil supplement tank 17, ensure the continuous supply of lubricating oil, reduce the leakage and waste of oil mist, improve the working efficiency and reliability of the equipment, reduce the maintenance cost, meet the environmental protection requirements, and ensure the high efficiency, stability and environmental protection of the hydro-generator set in long-term operation.

[0034] Embodiment 2

[0035] As a preferred embodiment of the utility model, the embodiment is based on the above embodiment 1, and further detailed supplement and elaboration are made to the technical scheme of the utility model, referring to Figure 1 In the embodiment, one end of the suction hole 14 of the main oil baffle seal 1 is connected with the oil mist suction and discharge pipe flange, and the other end is provided with a labyrinth pipe 16 for increasing the overflow path of the oil mist.

[0036] In the embodiment, the labyrinth pipe 16 is added between the suction hole 14 of the main oil baffle seal 1 and the oil mist suction and discharge pipe, and a multiple folding structure is adopted, so that the overflow path of the oil mist is significantly increased, thereby effectively improving the separation efficiency of the oil mist.

[0037] Embodiment 3

[0038] As another preferred embodiment of the utility model, the embodiment is based on the above embodiment 2, and further detailed supplement and elaboration are made to the technical scheme of the utility model, referring to Figure 1 In the embodiment, the oil supplementing pipe 7 is provided with an oil supplementing control valve 6, and the mechanical float valve 8 is arranged at the communication position of the oil supplementing pipe 7 and the oil tank 17.

[0039] In the embodiment, the oil supplementing function can be automatically opened or closed according to the oil level, over-supplementing or insufficient supplementing of oil can be prevented, and the operation error of the oil supplementing control valve 6 can be avoided, so that the system can be stably operated.

[0040] Embodiment 4

[0041] As another preferred embodiment of the utility model, the embodiment is based on the above embodiment 3, and further detailed supplement and elaboration are made to the technical scheme of the utility model, referring to Figure 1 In the embodiment, the oil mist treatment device 4 comprises a suction module for suctioning oil mist, a separation module for separating waste oil in the oil mist, a waste oil recovery module for collecting the separated waste oil, and a waste oil purification module for purifying the waste oil, which are connected in sequence; in the embodiment, the suction module is a variable frequency fan, the separation module is an electrostatic adsorber, the waste oil recovery module and the oil supplementing tank 5 are storage tanks with pumping function; the waste oil purification module is a high-precision electrostatic filter unit, which is arranged between the waste oil recovery module and the oil supplementing tank 5.

[0042] The embodiment realizes efficient oil mist suction and exhaust and waste oil purification treatment. The suction module adopts a frequency conversion fan, the air volume of which can be adjusted according to the oil mist concentration, thereby improving the treatment efficiency. The separation module uses an electrostatic adsorber, which effectively separates the waste oil in the oil mist, reduces waste oil emission, and avoids tail gas pollution of the oil mist treatment module to the environment of the power plant. The waste oil recovery module is provided with a storage tank with pumping function, which can collect and store the separated waste oil, thereby providing guarantee for subsequent purification treatment. The waste oil purification module uses a high-precision electrostatic filtration unit to deeply purify the waste oil, thereby ensuring the quality and performance of the lubricating oil in the oil mist recovery system, improving the stability of the oil mist recovery system, reducing energy consumption, prolonging the service life of the equipment and reducing environmental pollution.

[0043] Embodiment 5

[0044] As the best embodiment of the utility model, the embodiment is a further detailed supplement and elaboration of the technical solution of the utility model on the basis of the above-mentioned embodiment 4, and refers to Figure 1 In the embodiment, a return spring is arranged between the sealing tooth 12 and the main oil baffle seal 1, the gap between the sealing tooth 12 and the rotating shaft is not less than the guide bush gap, and the brush of the brush seal 11 is in contact with the rotating shaft.

[0045] In the embodiment, the return spring arranged between the sealing tooth 12 and the main oil baffle seal 1 ensures that the sealing tooth 12 maintains a good sealing state in long-term use, avoids the sealing performance from being reduced due to abrasion, thereby effectively preventing oil mist leakage and improving the sealing performance and stability of the system. Meanwhile, the gap between the sealing tooth 12 and the rotating shaft is designed to be not less than the guide bush gap, thereby avoiding friction loss and instability caused by too small gap and ensuring smooth operation of the system under high load. The brush of the brush seal 11 is in contact with the rotating shaft, which helps to further seal the oil groove 17 area, effectively prevents oil mist leakage and ensures efficient operation of the oil mist treatment device 4.

[0046] The principle of the utility model is as follows:

[0047] The oil mist is sucked into the oil mist treatment device 4 through the suction hole 14 on the main oil baffle seal 1 and the oil mist suction and exhaust pipe, and the suction hole 14 is designed through the labyrinth pipe 16 to increase the overflow path of the oil mist, so as to more effectively guide the oil mist flow to the oil mist treatment device 4, slow down the flow rate of the oil mist and improve the adsorption efficiency of the oil mist. The oil mist treatment device 4 includes multiple modules, first, the oil mist is sucked by an oil suction module (such as a variable frequency fan or an oil suction pump), then the waste oil in the oil mist is separated through an oil mist treatment module (such as an electrostatic adsorber, a cyclone separator, etc.), then the waste oil is collected through a waste oil recovery module (such as a pumping storage tank), and finally the waste oil is further purified through a waste oil purification module (such as a high-precision electrostatic filtration unit). The purified oil mist is transported to the oil supplement tank 5 for replenishment to the oil tank 17. The oil supplement tank 5 is connected with the oil tank 17 through the oil supplement pipe 7, and the oil supplement amount is accurately adjusted through the oil supplement control valve 6 to ensure the stability of bearing lubrication and the lubrication effect of the bearing system. At the same time, the mechanical float valve 8 on the oil supplement pipe 7 can avoid excessive or insufficient oil supplement, and the air pressure at each place can be obtained through the air pressure sensor 18.

[0048] In order to maintain the sealing performance of the system, the sealing teeth 12 on the main oil baffle seal 1 are kept in effective contact through the return spring, which ensures the sealing performance of the system during operation. At the same time, the brush of the brush seal 11 is in contact with the rotating shaft, which helps to enhance the sealing effect. The vertical ring seal 2, the main oil baffle seal 1, the rotating shaft and the rotor support 10 together form a sealed cavity 13, which greatly improves the air pressure at the structure of the brush seal 11, thereby preventing the brush seal 11 from being affected by the negative pressure of the rotor cooling wind, and facilitating the complete sealing of the oil mist in the oil tank 17.

Claims

1. A vertical hydro-generator bearing oil mist treatment system, comprising an oil mist isolation device, an oil mist treatment device (4), and an oil replenishment tank (5), characterized in that: The oil mist isolation device includes a main oil baffle seal (1) and a vertical ring seal (2) fixed on the main oil baffle seal (1). The main oil baffle seal (1) is provided with a brush seal (11) and at least one sealing tooth (12) at one end near the motor shaft (9), and the other end is fixedly connected to the oil trough (17). The motor shaft (9), the rotor bracket (10) on the motor shaft (9), the vertical ring seal (2), and the main oil baffle seal (1) on one side of the vertical ring seal (2) form a sealing cavity (13). The other side of the vertical ring seal (2) The main oil baffle seal (1) is provided with a suction hole (14). The oil mist treatment device (4) is connected to the suction hole (14) through the suction pipe (3). One end of the oil replenishment tank (5) is connected to the oil mist treatment device (4) through the connecting pipe (15), and the other end is connected to the oil tank (17) through the oil replenishment pipe (7). The oil mist treatment device (4) includes a suction module for suctioning oil mist, a separation module for separating waste oil in oil mist, a waste oil recovery module for collecting the separated waste oil, and a waste oil purification module for purifying waste oil, which are connected in sequence.

2. The oil mist treatment system for a vertical hydro-generator bearing according to claim 1, characterized in that: One end of the suction hole (14) of the main oil baffle seal (1) is connected to the flange of the oil mist suction pipe, and the other end is provided with a labyrinth pipe (16) to increase the overflow path of the oil mist.

3. The oil mist treatment system for a vertical hydro-generator bearing according to claim 2, characterized in that: The labyrinthine pipe (16) is a spiral pipe or a multi-folded pipe.

4. A vertical hydro-generator bearing oil mist treatment system according to claim 1 or 3, characterized in that: The oil replenishment pipe (7) is equipped with an oil replenishment control valve (6).

5. The oil mist treatment system for a vertical hydro-generator bearing according to claim 4, characterized in that: A mechanical float valve (8) is provided at the connection between the oil supply pipe (7) and the oil tank (17).

6. The oil mist treatment system for a vertical hydro-generator bearing according to claim 5, characterized in that: The suction module is a variable frequency fan.

7. The oil mist treatment system for a vertical hydro-generator bearing according to claim 6, characterized in that: The separation module is an electrostatic adsorber, a cyclone separator, or a condensation unit.

8. The oil mist treatment system for a vertical hydro-generator bearing according to claim 7, characterized in that: The waste oil recovery module and the replenishment tank (5) are storage tanks with pumping function.

9. The oil mist treatment system for a vertical hydro-generator bearing according to claim 8, characterized in that: The waste oil purification module is a filter.

10. The oil mist treatment system for a vertical hydro-generator bearing according to claim 9, characterized in that: A return spring is provided between the sealing tooth (12) and the main oil baffle seal (1).

11. The oil mist treatment system for a vertical hydro-generator bearing according to claim 10, characterized in that: The gap between the sealing tooth (12) and the rotating shaft is not less than the guide tile gap, and the brush of the brush seal (11) is in contact with the rotating shaft.

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