Sealing and water retaining method for main shaft of hydroelectric generating set

Abstract

The invention discloses a hydroelectric generating set main shaft sealing water retaining method. At present, the oil level of a low-level oil tank rises obviously in the starting-up idling test process of a unit, and water enters a bearing lubricating oil system due to the fact that leaked water of a main shaft seal is injected into a water guide bearing. The method comprises the following steps that the section of a water retaining ring body is of a U-shaped structure, the middle of the water retaining ring body is of a circular hole structure, and the water retaining ring body is made of a rubber material; the two circles of steel cables with the diameter phi of 4.0 mm and the 8-shaped lock catches are adopted to replace stainless steel hoops, the U-shaped water retaining ring is fixed, the steel cables with the diameter phi of 4.0 mm have toughness, and the steel cable lock catches are fixed reliably and cannot loosen. The invention is applied to main shaft sealing and water retaining.

Description

Technical Field

[0001] The invention relates to a method for sealing and water blocking a main shaft of a hydroelectric generator set. Background Art

[0002] The downstream end cover of the water guide bearing of the hydro-turbine generator set uses a comb-tooth copper ring seal, and no oil retaining ring is set, which cannot effectively prevent the main shaft seal from leaking into the water guide bearing. The river water contains a lot of sediment during the flood season. After the unit has been running for a long time, the internal seal of the main shaft seal device has gradually worn out and sediment has accumulated. The seal of the main shaft seal device failed, resulting in a large amount of water leakage at the main shaft seal end cover. During the operation of the unit, the leaking water sprayed from the downstream side of the water guide bearing into the bearing oil tank.

[0003] At present, during the idling test, it was found that the oil level in the low-level oil tank rose significantly. Inspection found that the main shaft seal leaked and sprayed into the water-guided bearing, causing water to enter the bearing lubricating oil system. A large amount of water entered the unit bearing lubricating oil system, causing the oil to emulsify. The only measure to be taken is to stop the unit regularly and let it stand for drainage; online oil filtering cannot be performed during the operation of the unit (the vacuum oil filter needs to be heated to affect the oil temperature and bearing bush temperature). It seriously affects the safe operation of the unit and the economic benefits of power generation. Summary of the invention

[0004] The purpose of the invention is to provide a method for sealing and blocking water of a main shaft of a hydroelectric generator set.

[0005] The above purpose is achieved through the following technical solutions: A method for sealing and blocking water of a main shaft of a hydroelectric generator set, the method comprising the following steps: (1) The cross section of the water retaining ring body is a U-shaped structure, the middle of the water retaining ring body is a circular hole structure, and the water retaining ring body is made of rubber; (2) Use two circles of Φ4.0mm diameter steel cable and "8"-shaped lock buckle to replace the stainless steel clamp to fix the U-shaped water retaining ring. The Φ4.0mm steel cable is tough and the steel cable lock buckle is securely fixed and will not loosen.

[0006] The water retaining ring body has a U-shaped cross section, a circular hole is formed in the middle of the water retaining ring body, and the water retaining ring body is made of rubber material, and the water retaining ring body is bonded and fixed to the main shaft; The inner diameter of the water retaining ring body is Φ860mm, the width is 24mm, the maximum thickness is 45mm, and the minimum thickness is 20mm.

[0007] The water retaining ring body is fixedly connected to the main shaft through two circles of Φ4.0mm diameter steel cables and an 8-shaped lock buckle.

[0008] Beneficial effects of the present invention: 1. The present invention uses U-shaped rubber products to make a special water retaining ring, and installs it on the main shaft. The U-shaped water retaining ring is installed at the leakage point of the main shaft seal of the No. 3 unit. After the unit has been running for more than one month, there is no leakage on the upstream side of the main shaft seal, and the oil level of each oil tank of the bearing lubricating oil system has not risen significantly. The problem of water leakage from the main shaft seal of the unit entering the water guide bearing is effectively solved, ensuring the safe and stable operation of the unit and the economic benefits of power generation.

[0009] 2. The present invention is due to the large axial movement (axial displacement) of the hydro-generator set during operation, and the large shaft diameter at the installation point of the U-shaped water retaining ring is gradually reduced (Φ860→Φ850, axial length 30mm). The original design of the stainless steel clamp has poor toughness and is prone to breakage when subjected to sudden force. In order to prevent the stainless steel clamp from breaking due to the large axial movement during the operation of the unit, two circles of Φ4.0mm diameter steel cable and "8" shaped lock buckle are used to replace the stainless steel clamp to fix the U-shaped water retaining ring. The Φ4.0mm steel cable is tough, and the steel cable lock buckle is reliably fixed and will not loosen. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Attached Figure 1 It is a structural schematic diagram of the present invention.

[0011] Attached Figure 2 Yes Figure 1 AA section view.

[0012] Attached Figure 3 It is a schematic diagram of the structure of the steel cable.

[0013] Attached Figure 4 It is a structural diagram of an 8-shaped lock.

[0014] Attached Figure 5 It is a structural schematic diagram of water leakage jetting into the bearing oil groove from the downstream side of the water guide bearing during unit operation.

[0015] In the figure: 1. Water retaining ring body, 2. Circular hole structure, 3. Steel cable, 4. Figure 8 lock, 5. Structural diagram of water guide bearing end cover, 6. Structural diagram of main shaft sealing end cover, 7. Water leakage along the main shaft into the direction of water guide bearing. DETAILED DESCRIPTION

[0016] Reference Figure 1-Figure 5 , a method for sealing and blocking water of a main shaft of a hydroelectric generator set, the method comprising the following steps: (1) The cross section of the water retaining ring body is a U-shaped structure, the middle of the water retaining ring body is a circular hole structure, and the water retaining ring body is made of rubber; (2) Use two circles of Φ4.0mm diameter steel cable and "8"-shaped lock buckle to replace the stainless steel clamp to fix the U-shaped water retaining ring. The Φ4.0mm steel cable is tough and the steel cable lock buckle is securely fixed and will not loosen.

[0017] A method for sealing and water-blocking the main shaft of a hydroelectric generator set, comprising: a water-blocking ring body 1, the cross section of the water-blocking ring body is a U-shaped structure, the middle of the water-blocking ring body is a circular hole structure 2, and the water-blocking ring body is made of rubber material, and the water-blocking ring body is bonded and fixed to the main shaft; The inner diameter of the water retaining ring body is Φ860mm, the width is 24mm, the maximum thickness is 45mm, and the minimum thickness is 20mm. The water retaining ring body is fixedly connected to the main shaft through two circles of Φ4.0mm diameter steel cables 3 and an 8-shaped lock buckle 4.

Claims

1. A method for sealing and blocking water of the main shaft of a hydroelectric generator set, characterized in that: The method comprises the following steps: (1) The cross section of the water retaining ring body is a U-shaped structure, the middle of the water retaining ring body is a circular hole structure, and the water retaining ring body is made of rubber; (2) Use two circles of Φ4.0mm diameter steel cable and "8" shaped lock buckle to replace the stainless steel clamp to fix the U-shaped water retaining ring. The Φ4.0mm steel cable is tough and the steel cable lock buckle is securely fixed and will not loosen.

2. A method for sealing and blocking water of a main shaft of a hydroelectric generator set according to claim 1, characterized in that: The cross section of the water retaining ring body is a U-shaped structure, the middle of the water retaining ring body is a circular hole structure, and the water retaining ring body is made of rubber material, and the water retaining ring body is bonded and fixed to the main shaft; The inner diameter of the water retaining ring body is Φ860mm, the width is 24mm, the maximum thickness is 45mm, and the minimum thickness is 20mm.

3. A method for sealing and blocking water of a main shaft of a hydroelectric generator set according to claim 2, characterized in that: The water retaining ring body is fixedly connected to the main shaft through two circles of steel cables with a diameter of Φ4.0mm and an 8-shaped lock buckle.

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