Lower guide oil collection assembly for small generator set

Abstract

The utility model relates to the technical field of oil mist treatment of generator sets, and discloses a lower guide oil collecting assembly for a small generator set, which comprises an oil collecting basin arranged at the bottom of an oil retaining barrel, a connecting plate is arranged between the oil collecting basin and the oil retaining barrel, and a connecting structure is arranged among the oil collecting basin, the oil retaining barrel and the connecting plate to realize detachable connection. The connecting structure comprises first bolts and second bolts, the first bolts are used for connecting the oil blocking barrel and the connecting plate, the second bolts are used for connecting the oil collecting basin and the connecting plate, and the first bolts and the second bolts are arranged in a staggered mode; and a sealing structure is arranged between the oil collecting basin and the generator main shaft. In practical application, the oil collecting basin is detachably connected to the bottom of the oil blocking barrel and tightly sealed with the generator spindle, the problem of oil mist of a generator set lower guide is effectively solved, and environmental pollution is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of oil mist treatment for generator sets, in particular to a lower guide oil collecting assembly for a small generator set. Background Art

[0002] The guide bearing of a hydrogenerator is an important component of the hydrogenerator 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 an oil baffle is also provided between the oil tank and the generator main shaft.

[0003] However, due to the inability of the oil baffle to prevent oil mist leakage in the lower guide of the hydrogenerator set, the lower guide bearing and the turbine chamber are covered with oil stains, and there is an environmental protection risk that the oil stains are discharged into the river or stream through the sump. Long-term oil leakage not only pollutes the water environment, but may even harm human health through water bodies or aquatic organisms. In view of the above defects, the unit has been optimized. The optimization method is to weld and fix a connecting plate to the bottom plate of the oil tank, and install an oil collecting basin at the bottom of the connecting plate, so that the lubricating oil is concentrated in the oil collecting basin after being thrown out and then processed orderly; currently, this optimization method is only applicable to large generator sets. For small hydrogenerator sets, due to the small diameter of the bottom plate of the oil tank and the narrow distance between the inlet and outlet water pipes of the cooler and the oil baffle, the operation space is very limited, there is no welding operation space, and the oil collecting basin cannot be installed. Therefore, the problem of oil throwing in the lower guide of small hydrogenerator sets remains unsolved. Summary of the Utility Model

[0004] The utility model aims to provide a lower guide oil collecting assembly for a small generator set to solve the problems of oil mist leakage and serious oil throwing in the lower guide bearing of a small hydrogenerator set.

[0005] To achieve the above purpose, the utility model adopts the following technical scheme: A lower guide oil collecting assembly for a small generator set includes an oil collecting basin. The oil collecting basin is arranged at the bottom of the oil baffle. A connecting plate is provided between the oil collecting basin and the oil baffle, and a connecting structure is provided among the three to realize detachable connection. The connecting 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 collecting basin and the connecting plate. The first bolt and the second bolt are arranged staggeredly; a sealing structure is provided between the oil collecting basin and the generator main shaft.

[0006] According to the structure of the hydro-turbine generator set, the oil retaining barrel is fixedly connected to the oil tank by bolts due to the need for regular disassembly. The existing large hydro-turbine generator set has a large diameter of the oil tank bottom plate, which has sufficient area in addition to the inlet and outlet pipes of the cooler, so the connecting plate can be directly welded to the oil tank bottom plate. However, the oil tank bottom plate of the small hydro-turbine generator set has a small diameter, and the distance between the inlet and outlet water pipes of the cooler and the oil retaining barrel is narrow, so there is no welding space for the connecting plate; considering that the oil retaining barrel needs to be disassembled regularly, if an oil collecting basin needs to be installed, the oil collecting basin can only be directly fixed to the oil retaining barrel or the oil tank bottom plate, but the direct fixing method has the following problems:

[0007] 1. When the oil collecting basin is directly connected to the oil retaining barrel: a sealing test is required each time the oil retaining barrel is disassembled and then installed, that is, lubricating oil is injected into the oil tank and the sealing between the oil retaining barrel and the generator main shaft is observed and judged. Therefore, the oil collecting basin must be installed after the sealing test is completed; since the oil collecting basin is a petal structure, the seal between the oil retaining barrel and the bottom plate of the oil tank will be squeezed for the second time during installation, causing the sealing performance of the seal to be weakened or even fail, affecting the bearing lubrication effect and reducing the service life of the seal.

[0008] 2. When the oil collecting pan is directly connected to the oil tank bottom plate: The installation of the oil collecting pan is currently aimed at the generator sets that have been put into operation. If you want to tap and drill holes on the oil tank bottom plate, you need to disassemble the oil tank bottom plate and return it to the factory for processing, which will not only cause the unit to shut down, but also because a contact seal must be achieved between the oil collecting pan and the generator main shaft, the tapping and drilling holes on the oil tank bottom plate must have high precision when returned to the factory for processing, and the processing cost is high. If all small generator sets adopt this method, the economic cost will be very huge.

[0009] In view of the above defects, the beneficial effects of this solution are:

[0010] 1. This solution makes use of the space available in the bolt structure of the oil baffle to enable detachable connection among the oil baffle, connecting plate, and oil collecting basin. The 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 collecting basin and the connecting plate. The first bolt and the second bolt are staggered. Using the connecting plate as a transition structure to cooperate with the first bolt and the second bolt for connection, first, it solves the problem that the connecting plate cannot be welded to the bottom plate of the fuel tank due to insufficient space, thus unable to install the oil collecting basin; second, it overcomes the defects caused by directly connecting the oil collecting basin to the oil baffle or the bottom plate of the fuel tank. The independent connections between the oil baffle and the connecting plate, and between the connecting plate and the oil collecting basin make the oil collecting basin have no direct connection with the existing unit structure. The connecting plate is installed synchronously when the oil baffle is disassembled. The installation of the connecting plate and the oil collecting basin will not cause secondary extrusion of the seal between the oil baffle and the bottom plate of the fuel tank, effectively ensuring the sealing performance of the unit structure itself. Moreover, the installation and disassembly process of the oil collecting basin is simple, greatly reducing economic losses. Under the premise of ensuring the structural sealing performance and economic cost, this solution enables the oil splashing from the lower guide of the small hydro-generator unit to be collected into the oil collecting basin and then discharged centrally, effectively solving the problem of oil splashing.

[0011] 2. After the oil splashing from the lower guide of the small hydro-generator unit is centrally collected, the oil pollution will no longer be discharged into the river or stream through the sump. This not only effectively avoids polluting the water environment, reduces the cleaning cost of the river water body, but also prevents the water body or aquatic organisms from being polluted and thus endangering human health.

[0012] 3. This solution is a simple improvement based on the existing structure and efficiently solves the problem of oil splashing pollution faced by small hydro-generator units at low cost, with high economic efficiency. At the same time, this solution is also applicable to large hydro-generator units and can effectively reduce the installation and maintenance costs.

[0013] Furthermore, an oil splashing ring is also provided between the oil collecting basin and the oil baffle, and the oil splashing ring is sleeved on the generator main shaft.

[0014] The oil splashing ring guides the excess lubricating oil to flow back, preventing the oil from splashing everywhere and maintaining the cleanliness and lubrication efficiency inside the unit.

[0015] Furthermore, the cross-section of the oil splashing ring is L-shaped, and the upper surface of the end of its horizontal part is an inclined plane sloping downward.

[0016] The above-mentioned inclined plane helps the splashed oil to drip and gather into the oil collecting basin along the shape of the inclined plane, avoiding the deposition of oil scale on the oil splashing ring. The deposition of oil scale will block the tiny gaps or holes of the oil splashing ring, reducing its effective working area, thereby reducing the speed and efficiency of the oil flowing back, reducing the accumulation of lubricating oil in unexpected areas, and ensuring the lubrication effect of the bearing.

[0017] Furthermore, a double-layer sealing ring is provided between the oil slinger and the generator main shaft.

[0018] The double-layer sealing ring has two functions. One is 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. The other is that good sealing can reduce equipment vibration and improve the running stability.

[0019] Furthermore, a sealing brush is provided between the oil sump and the oil slinger.

[0020] The sealing brush cooperates with the sealing structure on the oil sump to enhance the sealing performance, completely sealing the oil mist between the oil sump and the generator main shaft and reducing leakage.

[0021] Furthermore, a sealing gasket is provided between the oil sump and the connecting plate, and an O-ring is provided between the connecting plate and the oil baffle.

[0022] The above settings effectively enhance the sealing performance between the oil baffle, the oil sump and the connecting plate, reducing oil mist leakage.

[0023] Furthermore, the sealing structure is a contact sealing ring. A sealing groove for accommodating the contact sealing ring is provided on the oil sump. Limiting holes are provided on the contact sealing ring. Bolt mounting holes communicating with the sealing groove are provided on the oil sump. 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.

[0024] The limiting bolts strengthen the overall rigidity of the contact 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 structure a certain self-adjusting space to adapt to minor changes under different working conditions and extends the service life.

[0025] Furthermore, a drain pipe communicates outward from the bottom of the oil sump.

[0026] The oil liquid in the oil sump is regularly drained through the drain pipe, reducing the oil liquid deposition in the oil sump, and thereby reducing the cleaning frequency and cleaning cost of the oil sump. Description of the Drawings

[0027] Figure 1 It is a schematic diagram of the bottom structure of the lower guide oil tank.

[0028] Figure 2 For Figure 1 The sectional view along A-A in

[0029] Figure 3 For Figure 1 The sectional view along C-C in

[0030] Figure 4 is Figure 1 The sectional view along B-B in

[0031] Figure 5 is the structural schematic diagram of the oil slinger. Specific embodiments

[0032] The following is a further detailed description through specific embodiments:

[0033] The reference numerals in the drawings of the specification include: the generator main shaft 1, the oil baffle barrel 2, the oil collecting basin 3, the connecting plate 4, the first bolt 5, the second bolt 6, the O-ring 7, the gasket 8, the contact seal ring 9, the seal groove 10, the limit hole 11, the limit bolt 12, the oil slinger 13, the seal brush 14, the double-layer seal ring 15, and the drain pipe 16.

[0034] The embodiment is basically as shown in the attached Figures 1 - 5 figure: A lower guide oil collecting assembly for a small generator set includes an oil collecting basin 3. The oil collecting basin 3 is a split structure and is sleeved outside the generator main shaft 1. The oil collecting basin 3 is arranged at the bottom of the oil baffle barrel 2. A connecting plate 4 is provided between the oil collecting basin 3 and the oil baffle barrel 2, and a connecting structure is provided among the three to achieve detachable connection; as Figure 2 , Figure 3 shown in combination, the connecting structure includes a first bolt 5 and a second bolt 6. The first bolt 5 is used to connect the oil baffle barrel 2 and the connecting plate 4, and the second bolt 6 is used to connect the oil collecting basin 3 and the connecting plate 4. The first bolt 5 and the second bolt 6 are arranged staggeredly.

[0035] Through the above settings, firstly, the smooth installation of the oil collecting basin 3 at the bottom of the small hydro-generator set is realized by using the bolt installation space originally available at the bottom of the oil baffle barrel 2, solving the problem of oil leakage at the lower guide of the small hydro-generator set, and effectively avoiding the leakage of oil pollution into the water, causing serious water pollution and even human health pollution; secondly, by using the first bolt 5 and the second bolt 6 to fix the connecting plate 4 and the oil collecting basin 3 respectively in sequence, not only the installation difficulty and accuracy of the oil collecting basin 3 are reduced, but also the later maintenance or cleaning of the oil collecting basin 3 is facilitated, realizing quick and independent disassembly and reducing the economic cost.

[0036] As Figure 2As shown in the figure, a sealing structure is provided between the oil collecting basin 3 and the generator main shaft 1. The sealing structure is a contact sealing ring 9. A sealing groove 10 is formed on one side of the oil collecting basin 3 close to the generator main shaft 1, and the contact sealing ring 9 is installed in the sealing groove 10. Preferably, a limiting hole 11 is formed on the contact sealing ring 9, and a bolt limiting hole 11 communicating with the sealing groove 10 is formed on the oil collecting basin 3. A limiting bolt 12 is installed in the bolt limiting hole 11. After assembly, the end of the limiting bolt 12 is inserted into the limiting hole 11 of the contact sealing ring 9, effectively preventing the contact sealing ring 9 from generating displacement under strong vibration or drastic temperature change, resulting in sealing failure.

[0037] A sealing gasket 8 is provided between the oil collecting basin 3 and the connecting plate 4, and an O-ring 7 is provided between the connecting plate 4 and the oil baffle 2 to achieve tight sealing among the three, preventing oil mist leakage.

[0038] As Figure 3 shown in the figure, an oil slinger 13 is also provided between the oil collecting basin 3 and the oil baffle 2. The oil slinger 13 is sleeved on the generator main shaft 1. The oil slinger 13 is used to guide the excess lubricating oil to flow back, prevent the oil from splashing everywhere, and maintain the cleanliness and lubrication efficiency inside the unit. A double-layer sealing ring 15 is provided between the oil slinger 13 and the generator main shaft 1, and a sealing brush 14 is also provided between the oil collecting basin 3 and the oil slinger 13, so as to enhance the sealing performance of the overall structure and prevent oil mist leakage.

[0039] Preferably, as Figure 5 shown in the figure, the cross-section of the oil slinger 13 is L-shaped, and the upper surface of the end of its horizontal part is an inclined surface that slopes downward. The inclined inclined surface helps the splashed oil to drip and gather into the oil collecting basin 3 along the shape of the inclined surface, avoiding the deposition of oil scale on the oil slinger 13. The deposition of oil scale will block the tiny gaps or holes of the oil slinger 13, reduce its effective working area, thereby reducing the speed and efficiency of the oil flowing back, reducing the accumulation of lubricating oil in the unintended area, and ensuring the bearing lubrication effect.

[0040] Preferably, as Figure 4 shown in the figure, a drain pipe 16 communicates outward from the bottom of the oil collecting basin 3. The oil liquid in the oil collecting basin 3 is regularly drained through the drain pipe 16, reducing the deposition of oil liquid in the oil collecting basin 3, and further reducing the cleaning frequency and cleaning cost of the oil collecting basin 3.

[0041] The above are only the embodiments of the present utility model. 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 utility model, several deformations and improvements can be made, which should also be regarded as the protection scope of the present utility model, and these will not affect the implementation effect of the present utility model and the practicality of the patent. The protection scope claimed in this application shall be subject to the content of its claims, and the specific implementation manners and the like recorded in the specification can be used to interpret the content of the claims.

Claims

1. A lower oil collecting assembly for a small generator set, characterized in that: It includes an oil collecting basin, which is 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 connecting structure is provided between the three to achieve detachable connection. The 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 and the connecting plate. The first bolt and the second bolt are staggered. A sealing structure is provided between the oil collecting basin and the main shaft of the generator.

2. The lower oil collecting assembly for a small generator set according to claim 1, characterized in that: An oil slinger is also provided between the oil collecting basin and the oil retaining barrel, and the oil slinger is sleeved on the main shaft of the generator.

3. The lower oil collecting assembly for a small generator set according to claim 2, 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.

4. The lower oil collecting assembly for a small generator set according to claim 3, characterized in that: A double-layer sealing ring is provided between the oil slinger ring and the generator main shaft.

5. The lower oil collecting assembly for a small generator set according to claim 4, characterized in that: A sealing brush is arranged between the oil collecting basin and the oil slinger ring.

6. The lower oil collecting assembly for a small generator set according to claim 5, 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.

7. The lower oil collecting assembly for a small generator set according to claim 6, characterized in that: The sealing structure is a contact sealing ring, a sealing groove for accommodating the contact sealing ring is formed on the oil collecting pan, a limiting hole is formed on the contact sealing ring, a bolt mounting hole connected to the sealing groove is formed on the oil collecting pan, 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.

8. The lower oil collecting assembly for a small generator set according to claim 7, characterized in that: The bottom of the oil collecting basin is connected to the outside with an oil drain pipe.

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