A temporary treatment structure for weld cracks in the internal cooling water pipes of a large generator

Abstract

This invention provides a temporary treatment structure for weld cracks in the internal cooling water pipes of a large generator, comprising a sealing component and a pressing component. The sealing component includes a clamping component and a sealing gasket. The sealing gasket covers the crack, and the clamping component secures the sealing gasket to the water pipe. The pressing component includes two end fixing components and multiple connecting rods. The end fixing components include clamping rings, with the clamping rings of the two end fixing components clamping the crack on both sides of the water pipe. The two ends of the connecting rods are connected to the clamping rings, and adjusting nuts are threaded onto the connecting rods. The adjusting nuts control the two clamping rings to press towards the center of the connecting rod, thereby compressing the crack. This invention, through the combined design of the sealing component and the pressing component, achieves rapid crack sealing and effective suppression of crack propagation without shutting down the generator.

Description

Technical Field

[0001] This utility model relates to the field of treatment technology for weld cracks in internal cooling water pipes of large generators, and specifically to a temporary treatment structure for weld cracks in internal cooling water pipes of large generators. Background Technology

[0002] Large generator stators typically use water cooling. The system operates as follows: water in the cooling water tank is pressurized by an internal cooling water pump (one in use and one on standby), then enters a heat exchanger for cooling. After passing through a filter and a fine treatment device to remove impurities, the water flows through the exciter end internal cooling water pipe into the exciter end annular water collection pipe. It then enters the hollow conductors of each stator winding through an insulated water inlet pipe to absorb the heat from the windings, and finally collects at the steam end annular water collection pipe. The water then returns to the cooling water tank from the steam end internal cooling water pipe, completing the cycle.

[0003] Due to the long-term vibration during generator operation, the welds of the internal cooling water pipes may develop metal fatigue cracks due to vibration stress, causing internal cooling water to seep out or even spray out, seriously threatening the safe operation of the generator. Completely addressing this requires shutting down the internal cooling water system, which necessitates generator shutdown, leading to stringent non-shutdown requirements. Therefore, how to quickly seal the cracks and temporarily curb their propagation without shutting down the generator is an urgent problem to be solved. Utility Model Content

[0004] The purpose of this utility model is to address the shortcomings of existing technologies by providing a temporary treatment structure for weld cracks in the internal cooling water pipes of large generators. Through the combined design of sealing and extrusion components, it achieves rapid sealing of cracks and effective containment of crack propagation without shutting down the generator.

[0005] To solve the above-mentioned technical problems, this utility model provides a temporary treatment structure for weld cracks in the internal cooling water pipe of a large generator, including a sealing component and an extrusion component; The sealing component includes a clamping member and a sealing gasket, wherein the sealing gasket is used to cover the crack, and the clamping member is used to fix the sealing gasket to the water pipe; The extrusion component includes two end fixings and multiple connecting rods. The end fixings include clamping rings, and the clamping rings of the two end fixings are respectively used to clamp the cracks on both sides of the water pipe. The two ends of the connecting rods are respectively connected to the clamping rings. An adjusting nut is threaded onto the connecting rod. The adjusting nut is used to control the two clamping rings to squeeze towards the middle of the connecting rod, thereby squeezing the crack.

[0006] In some embodiments, the clamping ring includes two half-rings, the inner diameter of the two half-rings is not less than the diameter of the water pipe, a connecting nut is provided on the half-ring, a bolt is provided on the connecting nut, and the two half-rings are fixed to the water pipe by bolts.

[0007] In some embodiments, the connecting nut is welded to the end of the semi-ring.

[0008] Furthermore, the connecting nut is welded to the outer arc side and surface of the semi-ring.

[0009] In some embodiments, a plurality of smooth circular holes are formed on the semi-ring, and the end of the connecting rod passes through the smooth circular holes and is provided with the adjusting nut.

[0010] In some embodiments, a nut is fixedly provided at one end of the connecting rod, and an adjusting nut is provided at the other end of the connecting rod.

[0011] In some embodiments, a protective pad is provided on the inner side of the clamping ring.

[0012] In some embodiments, the sealing gasket is a rubber gasket.

[0013] In some embodiments, the two semi-rings are formed by cutting a flange.

[0014] The beneficial effects of this utility model are as follows: 1. This utility model achieves rapid crack sealing and effective crack propagation control without stopping the machine by combining the sealing component and the extrusion component.

[0015] 2. This utility model directly covers the crack with a sealing gasket and is firmly clamped to the water pipe by a clamping component, which can quickly form a sealing layer to prevent water from seeping or spraying out from the crack, reducing the safety threat of leakage to the generator. At the same time, it is easy to operate, only requiring cutting the rubber gasket and fixing the clamping component.

[0016] 3. This utility model utilizes two clamping rings to apply axial compressive force on both sides of the crack, which can effectively prevent the metal fatigue crack from continuing to develop and expand, thereby extending the temporary service life of the water pipe.

[0017] 4. This utility model uses conventional materials (such as flange-cut half-rings, screws, and nuts), and the manufacturing process is simple, requiring no specialized equipment or complex processes (such as only cutting and welding). The clamping ring can reuse existing flanges, and the connecting rod uses a standard screw. The overall cost is low, and the installation is flexible, suitable for on-site emergency handling, and can be operated by ordinary technicians. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model after it is installed at the crack. Figure 2 This is a schematic diagram of the clamping ring of this utility model; Figure 3 This is a schematic diagram of the structure of the clamping ring of this utility model installed on a water pipe; Figure 4 This is a schematic diagram of the structure of the clamping component and sealing gasket of this utility model installed on a water pipe.

[0019] Reference numerals: 1. Clamping component; 2. Sealing gasket; 3. Clamping ring; 31. Half ring; 32. Connecting nut; 33. Plain round hole; 4. Adjusting nut; 5. Connecting rod; 51. Nut. Detailed Implementation

[0020] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0021] like Figure 1 As shown, this utility model provides a temporary treatment structure for weld cracks in the internal cooling water pipe of a large generator, including a sealing component and an extrusion component; like Figure 4 As shown, the sealing component includes a clamping member 1 and a sealing gasket 2. The sealing gasket 2 is used to cover the crack, and the clamping member 1 is used to fix the sealing gasket 2 to the water pipe. The sealing gasket 2 can be a rubber gasket, and the clamping member 1 is a conventional metal clamp, or a hose clamp disclosed in CN211315441U that is easy to lock. The crack can be sealed by using the clamping member 1 and the sealing gasket 2.

[0022] like Figure 1 As shown, the extrusion component includes two end fixing parts and multiple connecting rods 5. The end fixing parts include clamping rings 3. The clamping rings 3 of the two end fixing parts are used to clamp on both sides of the crack in the water pipe. The two ends of the connecting rods 5 are connected to the clamping rings 3 respectively. An adjusting nut 4 is threaded onto the connecting rod 5. The adjusting nut 4 is used to control the two clamping rings 3 to squeeze towards the middle of the connecting rod 5, thereby squeezing the crack.

[0023] Understandably, as the adjusting nut 4 is tightened, the two clamping rings 3 are pulled tight, which creates an axial compression of the pipe at the weld, effectively preventing the vibration crack from continuing to develop and expand.

[0024] like Figure 2 As shown, the clamping ring 3 includes two semi-rings 31, the inner diameter of which is not less than the diameter of the water pipe. A connecting nut 32 is mounted on each semi-ring 31, and a bolt is mounted on each connecting nut 32. The two semi-rings 31 are fixed to the water pipe by the bolts. The two semi-rings 31 can be obtained by cutting a flange in half. A protective pad can be provided on the inner side of the clamping ring 3. The protective pad increases the friction between the clamping ring 3 and the water pipe and also prevents damage to the surface of the water pipe.

[0025] like Figure 2As shown, the connecting nut 32 is welded to the end of the semi-ring 31, and the connecting nut 32 is welded to the outer arc side and surface of the semi-ring 31. Figure 2 In the middle, each half ring 31 is welded with four connecting nuts 32.

[0026] like Figure 2 As shown, multiple smooth circular holes 33 are opened on the semi-ring 31, and the end of the connecting rod 5 passes through the smooth circular holes 33 and is fitted with an adjusting nut 4.

[0027] like Figure 1 As shown, the connecting rod 5 is a screw rod, with a nut 51 fixedly installed at one end of the connecting rod 5, and an adjusting nut 4 installed at the other end of the connecting rod 5. The compressive force of the two clamping rings 3 on the crack can be adjusted by turning the adjusting nut 4.

[0028] The fabrication and usage methods of the temporary treatment structure for weld cracks in the internal cooling water pipes of this large generator include: S1. Select a flange with a diameter equal to or slightly larger than that of the water pipe.

[0029] S2. Use a cutting machine to cut the flange symmetrically into two halves to form two semi-rings 31.

[0030] S3. Weld several pairs of connecting nuts 32 on the mating edges of the two semi-rings 31. In order to ensure that the connecting nuts 32 are in the correct direction during welding, each pair of connecting nuts 32 can be threaded onto the screw and then welded.

[0031] S4. Use a smaller connecting rod 5 to fix the two clamping rings 3 on the upper and lower sides of the crack. The lower clamping ring 3 can be firmly fixed, while the upper clamping ring 3 only needs to be slightly fixed so that the angle can be adjusted when installing the connecting rod 5 in the next step.

[0032] S5. After aligning the connecting rod 5 with the smooth round holes 33 of the two clamping rings 3, firmly fix the upper clamping ring 3 on the water pipe. Then rotate the adjusting nut 4 to tighten the connecting rod 5, so that the two clamping rings generate an up-and-down tightening force, that is, to form a radial up-and-down compression of the pipe at the weld, which can effectively prevent the vibration crack from continuing to develop and expand.

[0033] S6. Cut a rubber pad of appropriate size and use a metal one-way shrink band (i.e., clamp 1) to seal the crack.

[0034] It should be noted that step S6 can be performed before installing the clamping ring or before step S5, making the installation of clamping member 1 and sealing gasket 2 more convenient.

[0035] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A temporary treatment structure for weld cracks in the internal cooling water pipes of a large generator, characterized in that: Includes sealing components and extrusion components; The sealing component includes a clamping member (1) and a sealing gasket (2), the sealing gasket (2) being used to cover the crack, and the clamping member (1) being used to fix the sealing gasket (2) to the water pipe; The extrusion member includes two end fixing members and multiple connecting rods (5). The end fixing members include clamping rings (3). The clamping rings (3) of the two end fixing members are used to clamp the cracks on both sides of the water pipe. The two ends of the connecting rods (5) are connected to the clamping rings (3). The connecting rods (5) are threaded with adjusting nuts (4). The adjusting nuts (4) are used to control the two clamping rings (3) to press towards the middle of the connecting rods (5) to extrude the cracks.

2. The temporary treatment structure for weld cracks in the internal cooling water pipes of a large generator according to claim 1, characterized in that: The clamping ring (3) includes two half-rings (31), the inner diameter of the two half-rings (31) is not less than the diameter of the water pipe, a connecting nut (32) is provided on the half-rings (31), a bolt is provided on the connecting nut (32), and the two half-rings (31) are fixed to the water pipe by bolts.

3. The temporary treatment structure for weld cracks in the internal cooling water pipes of a large generator according to claim 2, characterized in that: The connecting nut (32) is welded to the end of the semi-ring (31).

4. The temporary treatment structure for weld cracks in the internal cooling water pipes of a large generator according to claim 3, characterized in that: The connecting nut (32) is welded to the outer arc side and surface of the semi-ring (31).

5. The temporary treatment structure for weld cracks in the internal cooling water pipes of a large generator according to claim 2, characterized in that: Multiple smooth circular holes (33) are opened on the semi-ring (31), and the end of the connecting rod (5) passes through the smooth circular holes (33) and is fitted with the adjusting nut (4).

6. The temporary treatment structure for weld cracks in the internal cooling water pipes of a large generator according to any one of claims 1 to 5, characterized in that: A nut (51) is fixedly installed at one end of the connecting rod (5), and an adjusting nut (4) is installed at the other end of the connecting rod (5).

7. The temporary treatment structure for weld cracks in the internal cooling water pipes of a large generator according to any one of claims 1 to 5, characterized in that: A protective pad is provided on the inner side of the clamping ring (3).

8. The temporary treatment structure for weld cracks in the internal cooling water pipes of a large generator according to any one of claims 1 to 5, characterized in that: The sealing gasket (2) is a rubber gasket.

9. The temporary treatment structure for weld cracks in the internal cooling water pipes of a large generator according to claim 2, characterized in that: The two semi-rings (31) are formed by cutting the flange.

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