Oil mist prevention sealing cover of small water turbine generator set

Abstract

The utility model relates to the technical field of sealing devices, and discloses an oil-mist-proof sealing cover of a small-sized water turbine generator set, which comprises a sealing cover body sleeved on a generator main shaft, a connector used for being communicated with an oil mist processor is arranged on the sealing cover body, one end of the connector close to the main shaft 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; and a sealing structure is mounted on one side of the oil mist inlet of the sealing cover body. In practical application, the oil mist prevention sealing cover and the generator main shaft are tightly sealed, oil mist leakage is avoided, and the lubricating effect of the generator guide bearing is effectively guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of sealing devices, in particular to an oil mist-proof sealing cover for a small hydro-generator set. Background Technique

[0002] The guide bearing of a hydro-generator is an important component of the hydro-generator bearing. It mainly bears the mechanical unbalance force of the rotor and the unilateral magnetic pull caused by the eccentricity of the rotor. Its main function is to prevent the shaft from swinging. The guide bearing located above the generator rotor is called the upper guide bearing, and vice versa is called the lower guide bearing. Their structures are similar. To ensure the cooling and lubrication of the guide bearing, the upper and lower guide bearings are installed in an oil tank filled with lubricating oil, and the top of the oil tank is sealed with a cover plate.

[0003] For a small hydro-generator set, the overall size of the unit is small, the internal structure is compact, the distance between the upper surface of the lower frame and the upper end surface of the lower guide journal is small, and the height of the existing oil tank cover plate is relatively large. After the cover plate is installed, the sealing ring on the cover plate extends beyond the upper end surface of the lower guide journal, resulting in the sealing failure between the cover plate and the main shaft, serious oil mist leakage, and poor bearing lubrication effect. Content of the Utility Model

[0004] The utility model aims to provide an oil mist-proof sealing cover for a small hydro-generator set to solve the problems of poor sealing of the oil tank cover plate and poor bearing lubrication effect in a small hydro-generator set.

[0005] To achieve the above purpose, the utility model adopts the following technical scheme: an oil mist-proof sealing cover for a small hydro-generator set, including a sealing cover body sleeved and installed on the generator main shaft. A connection port for connecting an oil mist processor is opened on the sealing cover body. One end of the connection port close to the 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; a sealing structure is installed on one side of the sealing cover body where the oil mist inlet is located.

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

[0007] 1. In practical application, in this scheme, the oil mist inlet of the connection port is lower than the oil mist outlet, so that the two ends of the connection port are staggered. The oil mist inlet moves downward and drives the whole sealing structure to move downward, so that the overall height of the sealing cover is reduced on the premise of ensuring the connection between the inside of the oil tank and the oil mist processor, and the top surface of the sealing structure on the sealing cover body is lower than the upper end surface of the lower guide journal, completely sealing the sealing cover and the generator main shaft, effectively preventing oil mist leakage, reducing the loss of lubricating oil in the oil tank, and ensuring the bearing lubrication effect.

[0008] 2. Due to environmental space limitations, the internal structure of small hydro-generator sets is arranged compactly. The distance between the top of the oil tank cover plate, i.e., the sealing cover, and the frame space is limited. Installing an oil mist processor on the sealing cover will result in limited overall installation space. The oil mist processor can only be installed on the frame sealing plate. However, during the operation of the unit, the sealing plate vibrates greatly, and the oil mist processor shakes significantly, resulting in a reduction in the separation efficiency of components such as filters and centrifuges inside the oil mist processor, causing the oil mist to not be effectively captured and processed. Moreover, in this solution, the oil mist processing capacity of the oil mist processor is reviewed and optimized, reducing the overall height of the oil mist processor. The oil mist processor can then be installed on the sealing cover, not only avoiding the shaking of the oil mist processor and ensuring the oil mist processing efficiency inside the unit, but also making the overall appearance of the unit more beautiful.

[0009] 3. The oil mist inlet of this solution is lower than the oil mist outlet, which also helps the oil mist to automatically return to the oil tank due to the height difference after condensing into oil beads, avoiding the deposition and scaling of lubricating oil in the pipeline of the oil mist processor and affecting the absorption and processing of the oil mist. The height difference design at both ends of the connection port improves the return rate of the lubricating oil while ensuring the absorption and processing of the oil mist, reducing lubricating oil waste and ensuring the bearing lubrication effect.

[0010] Furthermore, the height difference between the central axes of the oil mist inlet and the oil mist outlet is 18 - 25 mm.

[0011] Setting the height difference within the above range, first, 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 is contradictory to 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 return to the oil tank after condensing into oil beads, 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. Second, by precisely controlling the height difference, unnecessary high-pressure drive can be avoided, reducing the energy consumption in the oil mist processing system. A reasonable height makes it possible for the oil mist to flow and separate naturally, which is more energy-efficient and efficient compared to the forced separation method.

[0012] Furthermore, a plurality of oil mist breathers in an annular array are provided on the sealing cover body, and the oil mist breathers are communicated with the inside of the oil tank.

[0013] The oil mist breather can allow external air to enter the oil tank or the gas inside the oil tank to escape, maintaining the pressure balance inside and outside the system and protecting the sealing structure from damage due to excessive pressure.

[0014] Furthermore, the sealing structure includes an upper sealing ring and a lower sealing ring, and a sealing groove for accommodating the upper sealing ring and the lower sealing ring is provided on the sealing cover body.

[0015] The above double-layer seal design effectively 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 medium leakage and ensure the safe operation of the unit.

[0016] Furthermore, limiting holes are provided on both the upper sealing ring and the lower sealing ring, and bolt mounting holes communicating with the sealing groove are provided on the sealing cover body. The width of the limiting holes is greater than the width of the bolt mounting holes. Limiting bolts are installed in the bolt mounting holes, and the ends of the limiting bolts are inserted into the limiting holes.

[0017] The limiting bolts strengthen the overall rigidity of the upper sealing ring and the lower sealing ring. Even under extreme working conditions, such as strong vibration or drastic temperature changes, the sealing structure can remain stable, reducing the leakage risk caused by component displacement. Among them, the width of the limiting holes being greater than the width of the bolt mounting holes gives the sealing ring a certain self-adjusting space to adapt to the minor changes under different working conditions and extends the service life.

[0018] Furthermore, the upper sealing ring and the lower sealing ring are symmetrically arranged along the central axis of the oil mist inlet.

[0019] The above settings: one is to reduce the distance between the upper and lower sealing rings, reduce the overall height of the sealing cover, and ensure the sealing performance between the sealing cover and the generator main shaft; the other is that the symmetrical setting makes the resistance received by the oil mist uniform when passing through the oil mist inlet, reducing the leakage path.

[0020] Furthermore, a positioning sealing plate is provided on the sealing cover body, and the positioning sealing plate is located below the lower sealing ring.

[0021] The positioning sealing plate is designed to accurately align the sealing cover with the fuel tank interface, ensure that the sealing structure between the two can be evenly stressed, achieve a good sealing effect, and prevent oil leakage. Without the positioning sealing plate, more time may be required to adjust the position to ensure sealing each time after opening the cover for maintenance and reassembly, increasing the difficulty and time cost of maintenance work.

[0022] Furthermore, an installation groove is provided at the top of the sealing cover body, a brush is installed in the installation groove, a pressing plate is provided on the brush, and the pressing plate is bolted to the sealing cover body.

[0023] The brush is installed above the sealing structure, which can effectively filter out tiny impurities such as dust and moisture in the air, prevent them from entering the fuel tank with the air flow, thereby maintaining the cleanliness of the lubricating oil, reducing component wear, and extending the service life of the equipment. At the same time, as an elastic sealing material, the brush can, to a certain extent, make up for the tiny gap between the sealing cover and the generator main shaft, reduce the leakage of lubricating oil, and prevent external air from directly entering the oil box, maintaining the stability of the oil quality and internal pressure. Brief Description of the Drawings

[0024] Figure 1 It is a top view of the sealing cover.

[0025] Figure 2 is Figure 1 a sectional view taken along the A-A direction in

[0026] Figure 3 is Figure 1 a sectional view taken along the B-B direction in Detailed Description of the Embodiment

[0027] The following is a further detailed description through specific embodiments:

[0028] The reference numerals in the attached drawings of the specification include: sealing cover body 1, oil mist breather 2, connection port 3, oil mist inlet 31, oil mist outlet 32, connection head 4, sealing groove 5, upper sealing ring 6, lower sealing ring 7, limit hole 8, limit bolt 9, bolt mounting hole 10, positioning sealing plate 11, mounting groove 12, brush 13, pressing plate 14.

[0029] The embodiment is basically as shown in the attached Figures 1-3As shown: an anti-oil mist sealing cover for a small-sized hydro-turbine generator set, comprising a sealing cover body 1 sleeved and mounted on the main shaft of the generator, a plurality of oil mist respirators 2 in a ring array are arranged on the sealing cover body 1, and the oil mist respirators 2 are connected to the inside of the oil tank to adjust the pressure balance inside and outside the oil tank; a connecting port 3 is opened on the sealing cover body 1, one end of the connecting port 3 close to the main shaft of the generator 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 connected to the oil mist inlet 31, and the connector 4 is connected to an oil mist processor (not shown in the figure) outwardly, the oil mist inlet 31 is lower than the oil mist outlet 32, and the oil mist inlet 31 is lower than the oil mist outlet 32, and the oil mist inlet 32 ​​is lower than the oil mist outlet 32. The height difference between the central axis of the oil mist inlet 31 and the central axis of the oil mist outlet 32 ​​is 18-25mm. Within this range, the sealing structure and the oil mist inlet 31 can be ensured to move downward synchronously, so that the overall height of the sealing cover is effectively reduced, and the assembly sealing performance of the generator main shaft and the sealing cover is ensured. The oil mist can also be automatically returned to the oil tank after condensation by means of the height difference between the oil mist inlet 31 and the connector 4, thereby improving the reflux rate of the lubricating oil, reducing the waste of lubricating oil, and ensuring the lubrication effect of the bearing; secondly, the overall height of the sealing cover is effectively reduced, and the oil mist processor can be installed on the sealing cover, which not only avoids the shaking of the oil mist processor, but also ensures the oil mist treatment efficiency in the unit.

[0030] A sealing structure for sealing the generator main shaft and the sealing cover body 1 is installed on the sealing cover body 1, and the sealing structure includes an upper sealing ring 6 and a lower sealing ring 7. A sealing groove 5 for accommodating the upper sealing ring 6 and the lower sealing ring 7 is opened on the sealing cover body 1, and the upper sealing ring 6 and the lower sealing ring 7 are symmetrically arranged along the central axis of the oil mist inlet 31; a limiting hole 8 is opened on the upper sealing ring 6 and the lower sealing ring 7, and a bolt mounting hole 10 connected to the sealing groove 5 is opened on the sealing cover body 1, and the width of the limiting hole 8 is greater than the width of the bolt mounting hole 10. A limiting bolt 9 is installed in the bolt mounting hole 10. After assembly, the end of the limiting bolt 9 is inserted into the limiting hole 8, and the upper sealing ring 6 and the lower sealing ring 7 are strengthened and fixed to avoid leakage risks caused by component movement under extreme working conditions such as strong vibration or drastic temperature changes; wherein, the width of the limiting hole 8 is greater than the width of the bolt mounting hole 10, which gives the sealing ring a certain self-adjustment space, adapts to slight changes under different working conditions, and effectively prolongs the service life of the sealing structure.

[0031] Preferably, a positioning sealing plate 11 is provided on the sealing cover body 1, and the positioning sealing plate 11 is located below the lower sealing ring 7. The positioning sealing plate 11 is used to achieve precise alignment of the sealing cover and the oil tank interface, thereby ensuring a good sealing effect and preventing oil leakage, while improving installation efficiency and reducing the time and cost of each cover opening and maintenance.

[0032] Preferably, an installation groove 12 is formed in the top of the sealing cover body 1, and a brush 13 is installed in the installation groove 12. The brush 13 is made of elastic nylon material, and a pressing plate 14 is arranged on the brush 13. The pressing plate 14 is bolted to the sealing cover body 1. The brush 13 installed above the sealing structure can effectively filter out tiny impurities such as dust and moisture in the air, preventing them from entering the fuel tank with the air flow, thereby maintaining the cleanliness of the lubricating oil and reducing component wear. At the same time, as an elastic sealing material, the brush 13 can, to a certain extent, make up for the tiny gap between the sealing cover and the generator main shaft, reduce the leakage of the lubricating oil, and prevent the outside air from directly entering the oil box, maintaining the stability of the oil quality and the internal pressure.

[0033] The above are only embodiments of the present invention, and specific technical solutions and / or common knowledge such as characteristics well 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 practicability of the patent. The protection scope required by this application should be subject to 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 proof sealing cover for a small hydro turbine generator set, characterized in that: It includes a sealing cover body sleeved and installed on the main shaft of the generator. The sealing cover body is provided with a connection port for connecting to the oil mist processor. One end of the connection port close to the 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. A sealing structure is installed on one side of the oil mist inlet of the sealing cover body.

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

4. The oil mist proof sealing cover of a small water turbine generator set according to claim 3, characterized in that: The sealing structure comprises an upper sealing ring and a lower sealing ring, and a sealing groove for accommodating the upper sealing ring and the lower sealing ring is opened on the sealing cover body.

5. The oil mist proof sealing cover of a small water turbine generator set according to claim 4, characterized in that: The upper sealing ring and the lower sealing ring are both provided with limiting holes, the sealing cover body is provided with a bolt mounting hole connected with the sealing groove, the width of the limiting hole is greater than the width of the bolt mounting hole, a limiting bolt is installed in the bolt mounting hole, and the end of the limiting bolt is inserted into the limiting hole.

6. The oil mist proof sealing cover of a small water turbine generator set according to claim 5, characterized in that: The upper sealing ring and the lower sealing ring are symmetrically arranged along the central axis of the oil mist inlet.

7. The oil mist proof sealing cover of a small water turbine generator set according to claim 6, characterized in that: The sealing cover body is provided with a positioning sealing plate, and the positioning sealing plate is located below the lower sealing ring.

8. The oil mist proof sealing cover of a small water turbine generator set according to claim 7, characterized in that: The top of the sealing cover body is provided with an installation groove, a brush is installed in the installation groove, a pressing plate is provided on the brush, and the pressing plate is connected to the sealing cover body by bolts.

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