Oil mist treatment device for small water turbine generator set

Abstract

The utility model relates to the technical field of hydro-generator oil mist treatment, and discloses an oil mist treatment device for a small-sized hydro-generator set, which comprises a sealing cover and an oil collecting component, a connector is arranged on the sealing cover and used for being communicated with an oil mist treatment device, one end of the connector close to a generator spindle is an oil mist inlet, and the other end of the connector is an oil mist outlet. The oil mist inlet is lower than the oil mist outlet; the oil collecting assembly comprises an oil collecting basin arranged at the bottom of the oil blocking barrel, a connecting plate is arranged between the oil collecting basin and the oil blocking barrel, the oil collecting basin and the oil blocking barrel are detachably connected through the connecting plate, and the bottom of the oil collecting basin is outwards communicated with an oil discharging pipe. In practical application, the scheme effectively solves the problem of oil throwing of the lower guide bearing of the small water turbine generator set, and environment-friendly work is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of oil mist treatment for hydro-generators, and particularly to an oil mist treatment device for a small hydro-turbine generator set. Background Art

[0002] Within the precise operation framework of a hydro-turbine generator set, the stability and safety of the bearing system are the basis for ensuring long-term and efficient power generation. For this reason, in conventional designs, a dedicated lubrication system is configured at the bearing part, and the core component is an oil tank with built-in lubricating oil, aiming to continuously supply lubricating oil to reduce wear and maintain an appropriate temperature. The oil tank structure mostly selects an aluminum alloy cover plate and adopts an intermittent sealing scheme. However, this design often causes some oil mist to leak from the inner side of the cover plate during operation, accumulating and covering with oil stains, affecting aesthetics and maintenance convenience. At the same time, the lower guide bearing area faces the phenomenon of internal oil slinging. The bottom plate of the oil tank lacks an effective oil collection mechanism, and the oil mist leaks through the oil baffle bucket, not only polluting the environment of the lower guide of the generator and the hydro-turbine room, but also posing potential challenges to visual monitoring and environmental protection compliance.

[0003] In response to the above defects, the current generator set has been optimized and improved. The main measures are to adopt a new type of contact sealing cover plate, install an oil mist absorption and treatment device, and adopt a contact oil collection basin sealing form for the sealing of the bottom plate of the lower guide oil tank to achieve the orderly collection and export of spilled oil, and the oil slinging phenomenon will no longer occur. However, the above improvement methods are mainly for large generator sets. Due to the small overall size and compact structure of small hydro-turbine generator sets, the installation area where the oil tank cover plate is located and the bottom area of the oil baffle bucket at the lower guide bearing are narrow, and it is difficult to find an installation position for the oil mist absorption and treatment device and the oil collection basin in the above improvements. The oil stains will be discharged into the river or stream through the sump, not only polluting the water environment, but even endangering human health through water bodies or aquatic organisms. Therefore, the oil mist leakage problem and oil slinging problem of small hydro-turbine generator sets need to be solved urgently. Summary of the Utility Model

[0004] The utility model aims to provide an oil mist treatment device for a small hydro-turbine generator set to solve the problems of oil mist leakage and oil slinging of the lower guide bearing of the small hydro-turbine generator set.

[0005] To achieve the above purpose, the utility model adopts the following technical scheme: An oil mist treatment device for a small hydro-turbine generator set includes a sealing cover and an oil collection component. A connection port is opened on the sealing cover, and the connection port is used to connect to an oil mist processor. One end of the connection port close to the generator main shaft is an oil mist inlet, and the other end is an oil mist outlet. The oil mist inlet is lower than the oil mist outlet; the oil collection component includes an oil collection basin arranged at the bottom of the oil baffle bucket. A connecting plate is provided between the oil collection basin and the oil baffle bucket, and the detachable connection between the two is realized through the connecting plate. The bottom of the oil collection basin is externally connected with an oil discharge pipe.

[0006] The beneficial effects of this solution are as follows:

[0007] In response to the above problems, after repeated on-site inspections and solution verification attempts, the applicant found that for small hydro-generator sets, the oil mist processor can be installed on the frame sealing plate, and the oil mist processor is connected to the inside of the fuel tank through a connecting pipe. In this way, the problem that the installation area height of the fuel tank cover of the small generator set is not enough to install the oil mist processor is solved, and the oil mist leakage problem of the cover of the small generator set is effectively improved. However, during the operation after installing the oil mist processor, it was found that when the oil mist processor was installed on the frame sealing plate, due to the large vibration of the sealing plate during the operation of the unit, the oil mist processor had a large shaking amplitude, resulting in the ineffective capture and treatment of the oil mist inside the oil mist processor, and then continued oil mist leakage. At the same time, it also affected the aesthetics of the unit. Therefore, the applicant further analyzed the problems and reasons and made structural improvement and innovation, and solved the oil mist leakage problem by reducing the thickness of the sealing cover and the height of the oil mist processor.

[0008] 1. In actual application, in this solution, the oil mist inlet is lower than the oil mist outlet, so that the two ends of the connection port are staggered. The sealing structure between the sealing cover and the generator main shaft on the oil mist inlet side moves down as the oil mist inlet moves down, so that while ensuring the connection between the inside of the fuel tank and the oil mist processor and the good sealing between the sealing cover and the generator main shaft, the overall height of the sealing cover is reduced. Then, through recheck calculation and optimized design, the overall height of the oil mist processor is reduced, and the oil mist processor can be installed on the sealing cover, which not only avoids the shaking of the oil mist processor, ensures the oil mist treatment efficiency in the unit, but also makes the overall appearance of the unit more beautiful.

[0009] 2. In this solution, the oil mist inlet of the connection port is lower than the oil mist outlet, which also helps the oil mist to condense into oil beads and automatically return to the fuel tank due to the existing height difference, avoiding the deposition and scaling of lubricating oil in the pipeline of the oil mist processor, which affects the absorption and treatment of oil mist. The height difference design at both ends of the connection port improves the return rate of lubricating oil while ensuring the absorption and treatment of oil mist, reduces the waste of lubricating oil, and ensures the lubrication effect of the bearing.

[0010] The inlet and outlet water pipes of the cooler of the existing hydro-generator set generally enter and exit from the bottom plate of the fuel tank. The bottom space of the oil baffle of the large hydro-generator set is large, and the oil collecting basin is generally fixed at the bottom of the oil baffle by welding. However, due to the overall small size of the small hydro-generator set, the distance between the inlet and outlet water pipes of its cooler and the oil baffle is narrow, and the operation space is very limited. It is impossible to weld the connecting plate to the bottom plate of the fuel tank and then install the oil collecting basin as in the existing technology, resulting in the oil thrown out from the lower guide bearing entering the sump and being discharged into rivers or lakes. The oil pollution pollutes the water environment, affects fishery, and even endangers human health.

[0011] 3. According to the structure of the hydro-generator unit, the oil baffle of the unit itself has a bolt structure. This solution utilizes the space available in the bolt structure of the oil baffle to achieve detachable connection among the oil baffle, the connecting plate, and the oil sump, such as bolt connection, pin connection, etc. Compared with welding operations, it requires no larger operating space and is simple to install, meeting the installation requirements of small generator sets, enabling the oil thrown off by the lower guide of the small hydro-generator unit to be collected in the oil sump and then discharged centrally, effectively solving the environmental pollution problem and the harm to human health caused by oil throwing.

[0012] 4. In this solution, the connection between the oil sump and the oil baffle is a detachable connection. Compared with the welded fixed form, the later maintenance and cleaning of the oil sump in this solution are more convenient, which can reduce the damage to other structures of the unit and effectively extend the service life of the components and the overall unit.

[0013] 5. This solution makes simple improvements on the existing structure and cost-effectively solves the oil-throwing pollution problem faced by small hydro-generator units, with high economy. At the same time, this solution is also applicable to large hydro-generator units, reducing the installation and maintenance costs.

[0014] Furthermore, the height difference between the central axes of the oil mist inlet and the oil mist outlet is 18 - 25 mm.

[0015] Setting the height difference within the above range, firstly, if the height difference is too large, the overall space occupied by the oil mist inlet and the oil mist outlet will be large, resulting in an increase in the height of the sealing cover, which contradicts the purpose of reducing the height of the sealing cover. Moreover, if the height difference is too large, the flow cross-section between the oil mist inlet and the oil mist outlet will become smaller, making it difficult for the oil mist to condense into oil beads and flow back into the fuel tank, affecting the bearing lubrication effect; if the height difference is too small, the downward movement space of the oil mist inlet is tiny, resulting in an overly small downward movement space for the sealing structure on the oil mist inlet side and being unable to reduce the height of the sealing cover. Secondly, by precisely controlling the height difference, unnecessary high-pressure driving can be avoided, reducing the energy consumption in the oil mist treatment system. A reasonable height enables the natural flow and separation of the oil mist to be possible, which is more energy-efficient and efficient compared with the forced separation method.

[0016] Furthermore, a detachable connection structure is provided between the oil sump, the oil baffle, and the connecting plate. The detachable connection structure includes a first bolt and a second bolt. The first bolt is used to connect the oil baffle and the connecting plate, and the second bolt is used to connect the oil sump, the oil baffle, and the connecting plate. The first bolt and the second bolt are arranged staggeredly.

[0017] Compared with the welded connection in large generator sets, the detachable connection structure of the present solution does not require too much operating space. The first bolts and the second bolts arranged staggeredly utilize the bolt installation space inherent in the bottom of the oil baffle to achieve the smooth installation of the oil collecting basin at the bottom of the small hydro-generator set. Secondly, by using the first bolts and the second bolts to fix the connecting plate and the oil collecting basin respectively in sequence, not only the installation difficulty and precision of the oil collecting basin are reduced, but also the later maintenance or cleaning of the oil collecting basin is facilitated, realizing fast and independent disassembly.

[0018] Furthermore, a plurality of oil mist breathers are arranged on the sealing cover in an annular array, and the oil mist breathers are communicated with the inside of the fuel tank.

[0019] The oil mist breather can allow external air to enter the fuel tank or the gas inside the fuel tank to escape, so as to maintain the pressure balance inside and outside the system and protect the seal from damage caused by excessive pressure.

[0020] Furthermore, a double-layer sealing structure is provided between the sealing cover and the generator main shaft, and the double-layer sealing structure includes an upper sealing ring and a lower sealing ring.

[0021] The double-layer sealing structure enhances the sealing performance between the sealing cover and the generator main shaft, reduces oil mist leakage. At the same time, the lower sealing ring serves as the main seal, directly bearing the dynamic pressure and medium erosion under high-speed rotation, while the upper sealing ring serves as a backup. When the lower sealing ring is slightly damaged or fails, the upper sealing ring can still effectively block the oil mist leakage and ensure the safe operation of the unit.

[0022] Furthermore, the oil collecting assembly further includes an oil slinger, and the oil slinger is sleeved on the generator main shaft and located between the oil collecting basin and the oil baffle. The oil slinger guides the excess lubricating oil to flow back, preventing the oil from splashing everywhere and maintaining the cleanliness and lubrication efficiency inside the unit.

[0023] Furthermore, the cross-section of the oil slinger is L-shaped, and the upper surface of the end of its horizontal part is an inclined surface that slopes downward.

[0024] The inclined end of the oil slinger helps the splashed oil to drip and gather into the oil collecting basin along the shape of the inclined surface, avoiding the deposition of oil scale on the oil slinger. The deposition of oil scale will block the tiny gaps or holes of the oil slinger, reduce its effective working area, thereby reducing the speed and efficiency of the oil return, and may cause the lubricating oil to accumulate in unexpected areas, affecting the bearing lubrication effect.

[0025] Furthermore, a double-layer sealing ring is provided between the oil slinger and the generator main shaft.

[0026] The functions of the double-layer sealing ring are, firstly, to prevent the lubricating oil from leaking out along the gap between the generator main shaft and the oil slinger, reducing the loss of lubricating oil and environmental pollution; secondly, good sealing can reduce equipment vibration and improve the smoothness of operation.

[0027] Further, a sealing brush is provided between the oil collecting basin and the oil throwing ring. The sealing brush can effectively prevent oil mist from leaking between the oil collecting basin and the oil throwing ring.

[0028] Further, a sealing gasket is provided between the oil collecting basin and the connecting plate, and an O-ring seal is provided between the connecting plate and the oil baffle barrel. The above settings effectively enhance the sealing performance between the oil baffle barrel, the oil collecting basin and the connecting plate, and reduce oil mist leakage. Description of the Drawings

[0029] Figure 1 It is a top view of the sealing cover.

[0030] Figure 2 It is Figure 1 a cross-sectional view taken along the A-A direction in

[0031] Figure 3 It is Figure 1 a cross-sectional view taken along the B-B direction in

[0032] Figure 4 It is a schematic diagram of the bottom structure of the lower oil guide tank.

[0033] Figure 5 It is Figure 4 a cross-sectional view taken along A-A in

[0034] Figure 6 It is Figure 4 a cross-sectional view taken along C-C in

[0035] Figure 7 It is Figure 4 a cross-sectional view taken along the B-B direction in

[0036] Figure 8 It is a schematic diagram of the structure of the oil throwing ring. Detailed Description of the Invention

[0037] The following is a further detailed description through specific embodiments:

[0038] The reference numerals in the drawings of the specification include: sealing cover 1, oil mist breather 2, connection port 3, oil mist inlet 31, oil mist outlet 32, connection head 4, oil baffle barrel 5, oil collecting basin 6, connecting plate 7, drain pipe 8, first bolt 9, second bolt 10, oil throwing ring 11, generator main shaft 12, upper sealing ring 13, lower sealing ring 14, double-layer sealing ring 15, sealing gasket 16, O-ring seal 17, sealing brush 18.

[0039] Embodiment

[0040] An oil mist treatment device for a small hydroturbine generator set includes a sealing cover 1 and an oil collecting assembly, as Figures 1-3As shown, there are multiple oil mist breathers 2 arranged in an annular array on the sealing cover 1. The oil mist breathers 2 are communicated with the inner side of the sealing cover 1, that is, the inside of the fuel tank, to maintain the pressure balance inside and outside the lubrication system by allowing external air to enter the fuel tank or the gas inside the fuel tank to escape; a connection port 3 is opened on the sealing cover 1. One end of the connection port 3 close to the generator main shaft 12 is an oil mist inlet 31, and the other end is an oil mist outlet 32. A connector 4 is installed in the oil mist outlet 32. The connector 4 is communicated with the oil mist inlet 31. The connector 4 is communicated with an oil mist processor (not shown in the figure) outward. The position of the oil mist inlet 31 is lower than that of the oil mist outlet 32. The design of the height difference between the oil mist inlet 31 and the connector 4 helps the oil mist to condense into oil beads and automatically return to the fuel tank, avoiding the deposition and scaling of lubricating oil in the pipeline of the oil mist processor and affecting the absorption and treatment of the oil mist. The design of the height difference at both ends of the connection port 3 improves the reflux rate of the lubricating oil while ensuring the absorption and treatment of the oil mist, reduces the waste of the lubricating oil, and ensures the lubrication effect of the bearing.

[0041] A double-layer sealing structure is provided between the sealing cover 1 and the water turbine generator main shaft 12. The double-layer sealing structure includes an upper sealing ring 13 and a lower sealing ring 14. The upper sealing ring 13 and the lower sealing ring 14 are located on both sides of the oil mist inlet 31. The double-layer sealing structure enhances the sealing performance between the sealing cover 1 and the water turbine generator main shaft 12, reduces the oil mist leakage. At the same time, the lower sealing ring 14 serves as the main seal, directly bearing the dynamic pressure and medium erosion under high-speed rotation, while the upper sealing ring 13 serves as a backup. When the lower sealing ring 14 is slightly damaged or fails, the upper sealing ring 13 can still effectively block the oil mist leakage and ensure the safe operation of the unit.

[0042] Through the above settings, the two ends of the connection port 3 are staggered, the oil mist inlet 31 moves downward relative to the oil mist outlet 31, and the upper sealing ring 13 and the lower sealing ring 14 on both sides of the oil mist inlet 31 also move downward as a whole, so that the overall height of the sealing cover 1 is reduced on the premise of ensuring the connection between the inside of the fuel tank and the oil mist processor and the good sealing between the sealing cover 1 and the generator main shaft 12. The oil mist processor can be installed on the sealing cover 1, which not only avoids the shaking of the oil mist processor but also ensures the oil mist treatment efficiency inside the unit.

[0043] Preferably, the height difference between the central axes of the oil mist inlet 31 and the oil mist outlet 32 is 18 - 25 mm. In this embodiment, the height difference between the oil mist inlet 31 and the oil mist outlet 32 is 20 mm. Setting the height difference within the above range, firstly, if the height difference is too large, the overall space occupied by the oil mist inlet 31 and the oil mist outlet 32 will be large, resulting in an increase in the height of the sealing cover 1, which contradicts the purpose of reducing the height of the sealing cover 1. Moreover, if the height difference is too large, the flow cross-section between the oil mist inlet 31 and the oil mist outlet 32 will become smaller, making it difficult for the oil mist to condense into oil beads and flow back into the fuel tank, affecting the bearing lubrication effect; if the height difference is too small, the downward movement space of the oil mist inlet 31 is tiny, resulting in an overly small downward movement space for the double-layer sealing structure on the oil mist inlet 31 side and making it impossible to reduce the height of the sealing cover 1. Secondly, by precisely controlling the height difference, unnecessary high-pressure driving can be avoided, reducing the energy consumption in the oil mist treatment system. A reasonable height enables the natural flow and separation of the oil mist, which is more energy-efficient and efficient compared to the forced separation method.

[0044] As Figures 4-8 shown, the oil collecting assembly includes an oil collecting basin 6 provided at the bottom of the oil baffle barrel 5. A connecting plate 7 is provided between the oil collecting basin 6 and the oil baffle barrel 5, and the detachable connection between the two is achieved through the connecting plate 7. The bottom of the oil collecting basin 6 is externally connected to an oil discharge pipe 8, and the other end of the oil discharge pipe 8 is connected to an oil discharging assembly. Since the oil discharging assembly is a prior art, it will not be described in detail here; a detachable connection structure is provided between the oil collecting basin 6, the oil baffle barrel 5, and the connecting plate 7, such as Figure 5 , Figure 6 shown in combination. The detachable connection structure includes a first bolt 9 and a second bolt 10. The first bolt 9 is used to connect the oil baffle barrel 5 and the connecting plate 7, and the second bolt 10 is used to connect the oil collecting basin 6, the oil baffle barrel 5, and the connecting plate 7. The first bolt 9 and the second bolt 10 are arranged in an alternating manner.

[0045] Compared with the welding connection in large generator sets, the above detachable connection structure does not require too much operating space. The alternately arranged first bolt 9 and second bolt 10 utilize the bolt installation space originally available at the bottom of the oil baffle barrel 5 to successfully install the oil collecting basin 6 at the bottom of the small hydro-generator set; secondly, by respectively fixing the connecting plate 7 and the oil collecting basin 6 with the first bolt 9 and the second bolt 10 in sequence, not only the installation difficulty and precision of the oil collecting basin 6 are reduced, but also the later maintenance or cleaning of the oil collecting basin 6 is facilitated, achieving quick and independent disassembly.

[0046] The oil collecting assembly further includes an oil slinger 11. The oil slinger 11 is sleeved on the generator main shaft 12 and is located between the oil collecting basin 6 and the oil baffle barrel 5. A double-layer sealing ring 15 is provided between the oil slinger 11 and the generator main shaft 12, and a sealing brush 18 is provided between the oil slinger 11 and the oil collecting basin 6; preferably, as Figure 8As shown, the cross-section of the oil slinger 11 is L-shaped, and the upper surface of the end of its horizontal part is an inclined surface that slopes downward; this helps the splashed oil to drip and gather into the oil collecting basin 6 along the shape of the inclined surface, preventing oil leakage and the deposition of oil scale on the oil slinger 11. The deposition of oil scale will block the tiny gaps or holes of the oil slinger 11, reducing its effective working area, thereby reducing the speed and efficiency of oil return, which may cause the lubricating oil to accumulate in unexpected areas and affect the bearing lubrication effect.

[0047] As Figure 5 shown, a gasket 16 is provided between the oil collecting basin 6 and the connecting plate 7, and an O-ring 17 is provided between the connecting plate 7 and the oil baffle barrel 5, effectively ensuring good sealing between the oil collecting basin 6 and the oil baffle barrel 5 and the generator main shaft 12, and effectively preventing oil mist from leaking through the gap.

[0048] The above are only the embodiments of the present invention. Specific technical solutions and / or common knowledge such as characteristics known in the art are not described in detail herein. It should be noted that for those skilled in the art, without departing from the technical solution of the present invention, several deformations and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the implementation effect of the present invention and the practicality of the patent. The protection scope required by this application should be based on the content of its claims, and the specific implementation manners described in the specification can be used to interpret the content of the claims.

Claims

1. An oil mist treatment device for a small hydro-turbine generator set, characterized in that: It includes a sealing cover and an oil collecting assembly. The sealing cover is provided with a connecting port, which is used to connect to the oil mist processor. One end of the connecting port close to the generator main shaft is the oil mist inlet, and the other end is the oil mist outlet. The oil mist inlet is lower than the oil mist outlet. The oil collecting assembly includes an oil collecting basin arranged at the bottom of the oil baffle barrel. A connecting plate is provided between the oil collecting basin and the oil baffle barrel, and a detachable connection between the two is achieved through the connecting plate. The bottom of the oil collecting basin is connected to the outside with an oil drain pipe.

2. The oil mist treatment device for a small water turbine generator set according to claim 1, characterized in that: The height difference between the center axis of the oil mist inlet and the center axis of the oil mist outlet is 18-25 mm.

3. The oil mist treatment device for a small water turbine generator set according to claim 1 is characterized in that: A detachable connecting structure is provided between the oil collecting basin, the oil baffle barrel and the connecting plate. The detachable connecting structure includes a first bolt and a second bolt. The first bolt is used to connect the oil baffle barrel and the connecting plate, and the second bolt is used to connect the oil collecting basin, the oil baffle barrel and the connecting plate. The first bolt and the second bolt are arranged alternately.

4. The oil mist treatment device for a small water turbine generator set according to claim 2 is characterized in that: The sealing cover is provided with a plurality of oil mist respirators in a circular array, and the oil mist respirators are communicated with the inside of the oil tank.

5. The oil mist treatment device for a small water turbine generator set according to claim 4, characterized in that: A double-layer sealing structure is arranged between the sealing cover and the main shaft of the generator, and the double-layer sealing structure comprises an upper sealing ring and a lower sealing ring.

6. The oil mist treatment device for a small water turbine generator set according to claim 3, characterized in that: The oil collecting assembly also includes an oil slinger ring, which is sleeved on the main shaft of the generator and located between the oil collecting basin and the oil retaining barrel.

7. The oil mist treatment device for a small water turbine generator set according to claim 6, characterized in that: The cross section of the oil slinger is L-shaped, and the upper surface of the end of the transverse part is a downwardly inclined slope.

8. The oil mist treatment device for a small water turbine generator set according to claim 7, characterized in that: The oil slinger ring and the generator main shaft are provided with double-layer sealing rings.

9. The oil mist treatment device for a small water turbine generator set according to claim 8, characterized in that: A sealing brush is arranged between the oil collecting basin and the oil slinger ring.

10. The oil mist treatment device for a small water turbine generator set according to claim 9, characterized in that: A sealing gasket is arranged between the oil collecting basin and the connecting plate, and an O-type sealing ring is arranged between the connecting plate and the oil retaining barrel.

Images