A protection device for a water turbine main shaft bolt

Abstract

The utility model relates to bolt protection technical field discloses a water turbine main shaft bolt protection device, including bolt, protection cover and screw, the bolt is located in the protection cover and will be connected on the runner main shaft flange, the protection cover is fixed on the bolt through the screw, its characterized in that, the protection cover completely seals the bolt on the main shaft flange. Protect the bolt from being eroded by water, improve bolt life, reduce maintenance cost.

Description

Technical Field

[0001] This utility model relates to the field of bolt protection technology, specifically to a protection device for the main shaft bolts of a water turbine. Background Technology

[0002] The main shaft bolt protection device is an important component of a hydro-generator unit. Hydro-turbines typically operate in humid, water-rich environments, making the bolts susceptible to corrosion from moisture, chemicals, and other substances. The bolt protection device is designed to isolate the turbine runner and main shaft connecting studs from the water flow during unit operation, preventing corrosion and thus avoiding damage.

[0003] Chinese patent document CN209892602U discloses a protective structure for the connecting bolts of a turbine main shaft, including a main shaft and a runner fitted on the main shaft. The main shaft and the runner are fixedly connected by connecting bolts, and a protective cover is provided above the connecting bolts. The lower end of the protective cover abuts against the end face of the main shaft flange, and a first screw plug is provided at the upper end of the protective cover. The lower end face of the first screw plug is lower than the top surface of the inner wall of the protective cover, and the height difference between the lower end face of the first screw plug and the top surface of the inner wall of the protective cover is equal to the gap height between the connecting bolts and the protective cover. A first screw hole is provided on the first screw plug, and a positioning bolt is fitted in the first screw hole to fix the protective cover to the connecting bolts.

[0004] In the existing technology, although the protective cover covers the connecting bolts, when the turbine is running, the main shaft and the runner will be completely submerged in water during the rotation of the main shaft. The bolts are located close to the main shaft, and water will slowly seep into the bolts through the gap between the protective cover and the main shaft. Over time, the water flow will erode the connecting bolts and nuts, causing damage to the bolts. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a turbine main shaft bolt protection device, including a bolt, a protective cover and screws. The bolt is located inside the protective cover and connects the main shaft flange to the runner. The protective cover is fixed to the bolt by screws, and the protective cover completely encloses the bolt on the main shaft flange.

[0006] Preferably, the protective cover is an annular groove with the opening facing downwards.

[0007] For ease of installation, the protective cover adopts a segmented structure.

[0008] Preferably, the protective cover includes an upper protective cover and a lower protective cover, the upper and lower protective covers being semi-circular, and the ends of the upper and lower protective covers being detachably connected.

[0009] Preferably, both the upper and lower protective covers are provided with connecting plates at their ends, and the connecting plates are provided with connecting holes, which are then connected and fixed by connecting bolts.

[0010] To accommodate the installation space of the spindle flange, the inner ring of the protective cover is shorter than the outer ring. The inner ring contacts the top surface of the spindle flange, and the outer ring contacts the step on the outer wall of the spindle flange.

[0011] Furthermore, a sealing strip is provided between the annular groove and the main shaft flange (a sealing strip is provided between the outer ring and the right-angle end of the step, and a sealing strip is provided between the inner ring and the main shaft flange).

[0012] To prevent the screw from being corroded by water, the connection between the top of the screw and the protective cover, as well as the connection between the upper and lower protective covers, is filled with a sealing and waterproof coating.

[0013] This utility model has the following beneficial effects:

[0014] 1. In the prior art, because the spindle needs to rotate, there will be a gap between the protective cover and the spindle. In the limited installation space of the spindle flange, the present invention provides a sealed space for the bolts on the spindle flange through the protective cover. Water cannot enter the interior of the protective cover through the gap between the spindle and the protective cover, thus avoiding water intrusion and moisture entry, extending the service life of the bolts, and reducing the maintenance and replacement costs caused by bolt corrosion.

[0015] 2. It provides a beneficial protection measure for the safe and stable operation of the unit. The turbine main shaft bolt protection device is easy to manufacture, install, assemble, and adjust on site. In addition, it has good overall integrity and strong load-bearing capacity, making it safe, practical, and stable. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of an embodiment of the turbine main shaft bolt protection device of this utility model;

[0017] Figure 2 for Figure 1 Top view;

[0018] Figure 3 for Figure 2 Sectional view of AA;

[0019] Figure 4 for Figure 3 BB section view. Detailed Implementation

[0020] The following detailed description illustrates the specific implementation method:

[0021] The reference numerals in the accompanying drawings include: bolt 1, protective cover 2, upper protective cover 201, lower protective cover 202, inner ring 203, outer ring 204, screw 3, spindle flange 4, step 401, right angle end 402, wheel 5, connecting plate 6, connecting hole 7, connecting bolt 8, spindle 9, sealing strip 10, epoxy resin coating 11.

[0022] Example 1

[0023] like Figure 1-4 As shown, a turbine main shaft bolt protection device includes a bolt 1, a protective cover 2, and screws 3. The bolt 1 is located inside the protective cover 2 and connects the main shaft flange 4 to the runner 5. The protective cover 2 is fixed to the bolt 1 by the screws 3. The protective cover 2 completely encloses the bolt 1 on the main shaft flange 4.

[0024] The protective cover 2 is an annular groove with the opening facing downwards, and the protective cover 2 adopts a segmented structure.

[0025] The protective cover 2 includes an upper protective cover 201 and a lower protective cover 202. The upper protective cover 201 and the lower protective cover 202 are semi-circular. The ends of the upper protective cover 201 and the lower protective cover 202 are detachably connected. In use, considering that the protective cover 2 needs to be easily fitted and installed on the main shaft 9, and that direct lifting is inconvenient, a split structure is adopted so that the interference of the height of the main shaft 9 does not need to be considered.

[0026] Both the upper protective cover 201 and the lower protective cover 202 are provided with connecting plates 6 at their ends. The connecting plates 6 are provided with connecting holes 7, and the connecting holes 7 are connected and fixed by connecting bolts 8.

[0027] The inner ring 203 of the protective cover 2 is shorter than the outer ring 204. The inner ring 203 contacts the top surface of the main spindle flange 4, and the outer ring 204 contacts the step 401 on the outer wall of the main spindle flange 4. The installation space of the main spindle flange 4 is limited. Therefore, in order to facilitate installation and avoid interference with the main spindle 9 and bolt 1, and to make the most of the available space, the outer ring 204 is set on the step 401 on the outer wall of the main spindle flange 4. At the same time, it adds a deformation path, improves the sealing effect, and can also play a role in installation positioning.

[0028] A sealing strip 10 is provided between the annular groove and the main shaft flange 4, that is, a sealing strip 10 is provided between the outer ring 204 and the right-angle end 402 of the step 401, and a sealing strip 10 is provided between the inner ring 203 and the main shaft flange 4.

[0029] The connection between the top of the screw 3 and the protective cover 2, as well as the connection between the upper protective cover 201 and the lower protective cover 202, are all filled with an epoxy resin coating 11.

[0030] The above descriptions are merely embodiments of this utility model. Commonly known structures and characteristics are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are knowledgeable of all existing technologies in that field, and possess the ability to apply conventional experimental methods prior to that date. Therefore, those skilled in the art can, based on the guidance provided in this application, improve and implement this solution in conjunction with their own capabilities. Typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A turbine main shaft bolt protection device, comprising a bolt, a protective cover, and screws, wherein the bolt is located inside the protective cover and connects the main shaft flange to the runner, and the protective cover is fixed to the bolt by screws, characterized in that, The protective cover completely encloses the bolts on the spindle flange.

2. The turbine main shaft bolt protection device according to claim 1, characterized in that: The protective cover is an annular groove with the opening facing downwards.

3. The turbine main shaft bolt protection device according to claim 2, characterized in that: The protective cover adopts a segmented structure.

4. The turbine main shaft bolt protection device according to claim 3, characterized in that: The protective cover includes an upper protective cover and a lower protective cover, which are semi-circular in shape, and their ends are detachably connected.

5. The turbine main shaft bolt protection device according to claim 4, characterized in that: Both the upper and lower protective covers are provided with connecting plates at their ends. The connecting plates are provided with connecting holes, which are then connected and fixed by connecting bolts.

6. The turbine main shaft bolt protection device according to claim 5, characterized in that: The inner ring of the protective cover is shorter than the outer ring. The inner ring contacts the top surface of the main shaft flange, and the outer ring contacts the step on the outer wall of the main shaft flange.

7. The turbine main shaft bolt protection device according to claim 6, characterized in that: A sealing strip is provided between the annular groove and the main shaft flange.

8. The turbine main shaft bolt protection device according to claim 7, characterized in that: The top of the screw, where it connects to the protective cover, and the connection between the upper and lower protective covers are filled with a sealing and waterproof coating.

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