A large hydro-generator main shaft air-supply muffler protective cover

Abstract

The utility model relates to the field of protective cover, specifically disclose a large -scale water turbine generator main shaft air supplementing silencer protective cover for preventing foreign matter from falling into the air intake of silencer, and the protective cover includes the anti -hitting disc, the anti -hitting disc is conical, and the left and right ends of anti -hitting disc are symmetrically provided with the connecting seat, and the connecting seat is detachably connected with silencer, and the front and back ends of anti -hitting disc are symmetrically provided with the support rod, and the support rod passes through anti -hitting disc and is abutted with the end face of silencer. The utility model through the anti -hitting disc of conical can effectively, safely intercept falling foreign matter, prevent foreign matter from falling into the air intake, through the waist -shaped connection on the connecting seat makes the height of protective cover adjustable, and the protective cover is detachably connected with silencer, realizes the protective cover and will not reduce the air supplementing effect, will not increase equipment inspection maintenance difficulty, solves the poor protection effect and low safety of existing protective measures, and reduces the air supplementing effect and increases equipment inspection maintenance difficulty problem.

Description

Technical Field

[0001] This utility model relates to the field of protective covers, and specifically discloses a protective cover for a large hydro-generator main shaft air supply silencer. Background Technology

[0002] Typically, large hydropower stations house six 500MW conventional mixed-flow turbine-generator units in their underground powerhouses. To ensure stable operation of the turbines under partial load conditions, a natural air supply system is installed in the central bore of the main shaft. This system mainly consists of a DN400 air supply pipe, an air supply valve, a maintenance butterfly valve, and a silencer. The air supply valve is located above the generator's dummy shaft, the maintenance butterfly valve is located inside the generator rotor's central body, and the air supply pipe is located inside the central bore of the main shaft and leads to the space between the generator and the inner wall. A silencer is installed at the inlet of the air supply pipe to reduce whistling noise during air supply. During electromechanical installation, due to the obstruction of the powerhouse's fixed anchor cables, the silencer's air inlet was not fitted with a protective cover. This poses a risk that foreign objects such as stones, rags, cables, and reinforcing bars from inside the space between the inner wall may fall into the air supply pipe through the silencer's air inlet, potentially causing blockage of the unit's air supply system and affecting the safe and stable operation of the turbine-generator units.

[0003] Currently, the common solutions to the lack of protection for the main shaft air supply silencer in mixed-flow turbine units of hydropower stations involve installing a steel filter screen at the silencer's air inlet or setting the air inlet to face downwards. While these measures can prevent foreign objects from falling into the silencer's air inlet to some extent, they still have the following shortcomings:

[0004] 1. Installing a steel filter at the air inlet of the muffler can prevent large foreign objects from falling into the air inlet, but it cannot effectively block small gravel and debris. At the same time, the added filter will reduce the airflow path at the air inlet, which is not conducive to the air replenishment effect.

[0005] 2. Setting the muffler's air inlet to face downwards can pose a safety hazard when the unit is replenishing air. When people or objects are near the air inlet, there is a risk of them being sucked into the air inlet. At the same time, ground dust is more likely to be sucked into the air inlet.

[0006] 3. Installing a steel filter at the muffler's air inlet or setting the muffler's air inlet to face downwards will increase the difficulty of equipment inspection and maintenance. During maintenance, the equipment cannot be visually inspected directly and requires the use of instruments such as endoscopes for auxiliary inspection.

[0007] Therefore, there is an urgent need for a protective measure that can safely and effectively prevent foreign objects from falling into the air inlet without affecting the air supply effect and equipment inspection and maintenance. Utility Model Content

[0008] The purpose of this utility model is to provide a protective cover for a large hydro-generator main shaft air replenishment silencer, which solves the problems of poor protection effect and low safety of existing protective measures, as well as reduced air replenishment effect and increased difficulty of equipment inspection and maintenance.

[0009] The specific solution of this utility model is as follows:

[0010] A protective cover for a large hydro-generator main shaft air supply silencer is provided to prevent foreign objects from falling into the air inlet of the silencer. The protective cover includes an anti-smashing disc, which is conical in shape. Connecting seats are symmetrically arranged at the left and right ends of the anti-smashing disc. The connecting seats are detachably connected to the silencer. Support rods are symmetrically arranged at the front and rear ends of the anti-smashing disc. The support rods pass through the anti-smashing disc and abut against the end face of the silencer.

[0011] In some embodiments, the device further includes connecting bolts and connecting nuts. The muffler has symmetrically arranged fixing seats at both ends, with fixing holes on the fixing seats and connecting holes at the lower end of the connecting seats. The connecting bolts pass through the fixing holes and connecting holes in sequence and are then threadedly connected to the connecting nuts.

[0012] In some embodiments, the connection hole is an oblong connection hole, and the height of the protective cover can be adjusted by moving the oblong connection hole up and down.

[0013] In some embodiments, the support rod is provided with an external thread, and the front and rear ends of the anti-smashing disc are provided with support holes. The support holes are provided with internal threads that mate with the external threads. The support rod passes through the support holes and abuts against the end face of the muffler, and is connected to the anti-smashing disc through the mating of the external and internal threads.

[0014] In some embodiments, the protective cover is a stainless steel protective cover.

[0015] In some embodiments, the outer surface of the anti-smashing disc is provided with an anti-rust coating.

[0016] In some embodiments, a buffer layer is provided on the inner side of the anti-smashing disc.

[0017] In some embodiments, the buffer layer is a silicone pad.

[0018] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0019] 1. This utility model can effectively and safely intercept falling foreign objects through the conical anti-smashing disc, preventing foreign objects from falling into the air inlet; the waist-shaped connection on the connecting seat makes the height of the protective cover adjustable, and the protective cover and the silencer can be detachably connected, so that the protective cover will not reduce the air replenishment effect or increase the difficulty of equipment inspection and maintenance, thereby improving the protective effect and safety of the protective cover. Attached Figure Description

[0020] Figure 1This is a cross-sectional view of a protective cover for a large hydro-generator main shaft air supply silencer in an embodiment of this utility model.

[0021] Figure 2 This is a top view of the anti-smashing disc in an embodiment of this utility model.

[0022] Figure 3 This is a front view of the connecting seat in an embodiment of this utility model.

[0023] Attached reference numerals: 1-Anti-smashing disc, 11-Support hole, 2-Connecting seat, 21-Connecting hole, 3-Support rod, 4-Fixing seat, 5-Anti-rust coating, 6-Buffer layer, 7-Air inlet, 9-Silencer. Detailed Implementation

[0024] The specific implementation method is described below with reference to the accompanying drawings.

[0025] A protective cover for the main shaft air inlet silencer of a large hydro-generator is used to prevent foreign objects from falling into the air inlet of the silencer, such as... Figure 1 , Figure 2 and Figure 3 As shown, the protective cover includes a shockproof disc 1, which is conical in shape. Connecting seats 2 are symmetrically arranged at the left and right ends of the shockproof disc. One end of the connecting seat is welded to the shockproof disc 1, and the other end of the connecting seat is detachably connected to the muffler 9. Support rods 3 are symmetrically arranged at the front and rear ends of the shockproof disc. The support rods 3 pass through the shockproof disc 1 and abut against the end face of the muffler.

[0026] The anti-smashing disc has an inclination angle of 11°. When foreign objects such as stones, rags, cables, and steel bars fall from the wall into the disc, they will slide out of the anti-smashing disc 1 under the influence of gravity. This not only intercepts the foreign objects from falling into the air inlet 7, but also prevents them from acting on the anti-smashing disc for a long time, which could cause cracks or deformation in the disc 1. In particular, when water drips from the upper part of the wall, it can disperse and guide the water flow, preventing water from flowing into the silencer 9 from the air inlet 7 and causing damage to the equipment.

[0027] The conical anti-smashing disc 1 effectively and safely intercepts falling foreign objects, preventing them from entering the air inlet 7. The connecting seat 2 allows for detachable connection to the silencer 9, enabling quick installation and disassembly for easy equipment inspection and maintenance. Visual inspection of the equipment can be performed by quickly removing the protective cover without the need for auxiliary inspection equipment. The support rod 3 not only increases the strength of the anti-smashing disc, improving its load-bearing capacity and impact resistance, but also further enhances the stability of the protective cover.

[0028] In some embodiments, the device further includes connecting bolts and connecting nuts. The muffler is symmetrically provided with fixing seats 4 at both ends. The fixing seats are provided with fixing holes. The lower end of the connecting seat is provided with connecting holes 21. The connecting bolts pass through the fixing holes and connecting holes in sequence and are then threadedly connected to the connecting nuts.

[0029] In some embodiments, the connecting hole 21 is an oblong connecting hole, and the height of the protective cover can be adjusted by moving the oblong connecting hole up and down.

[0030] Considering the economic efficiency of processing and manufacturing, all six units on site are equipped with protective covers of the same size. In order not to affect the airflow path of the air inlet and to avoid the obstruction of the mountain anchor cables, the protective covers need to have height adjustment function. Therefore, the connection between the connecting seat and the fixed seat is designed to be a height-adjustable connection. Based on the measurement and calculation of the on-site equipment data, a waist-shaped connection hole with a height of 100mm is opened on the connecting seat for vertical height adjustment to meet the needs of the six units.

[0031] In some embodiments, the support rod is provided with an external thread, and the front and rear ends of the anti-smashing disc are provided with support holes 11. The support holes are provided with internal threads that cooperate with the external threads. The lower end of the support rod passes through the support hole 11 and abuts against the end face of the muffler. The upper end of the support rod is connected to the anti-smashing disc 1 through the cooperation of the external and internal threads.

[0032] The support rod 3 can be an M12*350mm screw rod, which is connected to the internal thread in the support hole through the external thread on the support rod, making disassembly and assembly easy, and the structure is simple and reliable.

[0033] In some embodiments, the protective cover is a stainless steel protective cover.

[0034] The protective cover can be made of 5mm thick 304 stainless steel plate. Stainless steel has the characteristics of high strength and is not easy to rust or mold, which can enable the protective cover to effectively and safely withstand the impact of foreign objects and adapt to the high humidity environment of hydropower stations.

[0035] In some embodiments, the protective cover may also be a protective cover made of aluminum alloy.

[0036] In some embodiments, the outer surface of the anti-smashing disc is provided with an anti-rust coating 5.

[0037] The corrosion resistance of the protective cover is further improved by the anti-rust coating 5.

[0038] In some embodiments, a buffer layer 6 is provided on the inner side of the anti-smashing disc 1.

[0039] The buffer layer 6 absorbs impact energy, thus providing a buffering effect and extending the service life of the protective cover.

[0040] In some embodiments, the buffer layer 6 is a silicone pad.

[0041] A silicone pad was used as the buffer layer 6, which has a good buffering effect and has been installed and replaced.

[0042] This utility model is not limited to the above embodiments. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model shall be included within the protection scope of this utility model.

Claims

1. A protective cover for a large hydro-generator main shaft air inlet silencer, used to prevent foreign objects from falling into the silencer's air inlet, characterized in that: The protective cover includes a shockproof disc, which is conical in shape. Connecting seats are symmetrically arranged at the left and right ends of the shockproof disc. The connecting seats are detachably connected to the muffler. Support rods are symmetrically arranged at the front and rear ends of the shockproof disc. The support rods pass through the shockproof disc and abut against the end face of the muffler.

2. The protective cover for the main shaft air supply silencer of a large hydro-generator according to claim 1, characterized in that: It also includes connecting bolts and connecting nuts. The muffler has symmetrically arranged fixing seats at both ends, and the fixing seats have fixing holes. The lower end of the connecting seat has a connecting hole. The connecting bolt passes through the fixing hole and the connecting hole in sequence and is then threadedly connected to the connecting nut.

3. A protective cover for a large hydro-generator main shaft air supply silencer according to claim 2, characterized in that: The connecting hole is an oblong connecting hole, and the height of the protective cover can be adjusted by moving the oblong connecting hole up and down.

4. The protective cover for the main shaft air supply silencer of a large hydro-generator according to claim 1, characterized in that: The support rod is provided with an external thread, and the front and rear ends of the anti-smashing disc are provided with support holes. The support holes are provided with internal threads that cooperate with the external threads. The support rod passes through the support holes and abuts against the end face of the muffler, and is connected to the anti-smashing disc through the cooperation of the external and internal threads.

5. A protective cover for a large hydro-generator main shaft air supply silencer according to claim 1, characterized in that: The protective cover is a stainless steel protective cover.

6. A protective cover for a large hydro-generator main shaft air supply silencer according to claim 1, characterized in that: The outer surface of the anti-smashing disc is coated with an anti-rust coating.

7. A protective cover for a large hydro-generator main shaft air supply silencer according to claim 1, characterized in that: The inner side of the anti-smashing disc is provided with a buffer layer.

8. A protective cover for a large hydro-generator main shaft air supply silencer according to claim 7, characterized in that: The buffer layer is a silicone pad.

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