Dismounting ring for hydraulic bolt of steam turbine

Abstract

The utility model discloses a steam turbine hydraulic bolt dismounting ring, which relates to the technical field of steam turbines, and comprises a coupler coupling I, a coupling gasket is attached to one side of the coupler coupling I, a coupler coupling II is arranged on one side of the coupling gasket, a positioning mechanism is arranged in the coupler coupling II, and the coupler coupling I is connected with the positioning mechanism. The positioning mechanism is used for locking the joint of the coupling wheel I and the coupling wheel II, so that expected stress is achieved between the bolt cone and the coupling bolt hole; the lubricating mechanism provides pressure for the first coupler coupling and the second coupler coupling through an oil injection hole and an oil groove to the combination face between the bolt cone and the cone sleeve by means of an oil injection method. A counter-pulling device is automatically designed and machined according to the actual situation, the device can penetrate into a bolt hole to fix an expansion sleeve, meanwhile, a stretcher is used for moving a screw rod, the screw rod and the expansion sleeve are easily separated, the oil pressure is only 20 MPa, the method is safe and rapid, and the bolt dismounting time is shortened to 1 day from the conventional fastest 5 days.

Description

Technical Field

[0001] This utility model relates to the technical field of steam turbines, and specifically to a hydraulic bolt removal ring for steam turbines. Background Technology

[0002] Hydraulic bolts are bolts that achieve a tight fit between the bolt and the coupling bolt hole by controlling the expansion of the tapered sleeve and the pre-tightening of the nut using specialized hydraulic tools. The hydraulic bolt system consists of three parts: bolt, nut, and tapered sleeve, with a conical surface fit between the bolt and tapered sleeve.

[0003] Because this hydraulic bolt only has a threaded installation rod on one side and not on the other, it can only be disassembled by injecting oil. The oil injection pressure is as high as 150MPa, which poses a significant safety risk. In addition, the expansion sleeve generally has oil leakage at the sealing surface, making disassembly by injecting oil impossible. Furthermore, the bolt can easily get stuck if not handled carefully, requiring a professional manufacturer to bring tooling to the site for destructive drilling to remove the bolt, which also makes the disassembly schedule uncontrollable. Summary of the Invention

[0004] The purpose of this invention is to provide a hydraulic bolt removal ring for steam turbines to solve the aforementioned defects caused by existing technologies.

[0005] A hydraulic bolt removal ring for a steam turbine includes a coupling coupling first, with a coupling washer fitted on one side of the coupling coupling first, and a coupling coupling second on one side of the coupling washer. A positioning mechanism is provided inside the coupling coupling second, which locks the connection between the coupling coupling first and coupling coupling second, thereby achieving the expected force between the bolt cone and the coupling bolt hole. A lubrication mechanism provides pressure to the mating surface between the bolt cone and the cone sleeve of the coupling coupling first and coupling coupling second through an oil injection hole and an oil groove using an oil injection method.

[0006] Preferably, the positioning mechanism includes a second coupling, a coupling washer, a nut, a bolt cone, a cone sleeve, and an external threaded sleeve. A coupling washer is fitted to one side of the second coupling. Nuts are connected through the outer sides of both the second coupling and the first coupling. The nuts are installed on both sides of the bolt cone, and a cone sleeve is wrapped around the outer side of the bolt cone.

[0007] Preferably, the bolt cone is connected to one end of the oil injection rod through a conical surface opened on one side.

[0008] Preferably, the lubrication mechanism includes a bolt cone, an external thread groove, an oil injection rod, a conical surface, a sealing sleeve, and an oil injection through hole. The external thread groove is formed on one side of the oil injection rod, a conical surface is provided on one side of the bolt cone, a sealing sleeve is provided on one side of the conical surface, and an oil injection through hole is provided on one side of the sealing sleeve.

[0009] Preferably, the bolt cone is connected to the cone sleeve through an internally perforated oil injection hole.

[0010] Preferably, the coupling pulley is connected to the outer side of the bolt cone via a nut provided on one side.

[0011] Compared with the prior art, the present invention has the following advantages:

[0012] 1. Design and manufacture a reverse pull device (disassembly ring) according to actual needs. This device can penetrate into the bolt hole to fix the expansion sleeve. At the same time, a tensioner is used to move the screw, so that the screw and the expansion sleeve can be easily separated. The hydraulic pressure only needs 20MPa. This method is safe and fast, reducing the bolt disassembly time from the conventional maximum of 5 days to 1 day. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0014] Figure 2 This is a schematic diagram of the bolt cone structure in this utility model.

[0015] Figure 3 This is a schematic diagram of the front section of the bolt cone structure in this utility model.

[0016] in:

[0017] 1. Coupling wheel one; 2. Coupling wheel two; 3. Coupling wheel washer; 4. Positioning mechanism; 5. Nut; 6. Bolt cone; 7. External thread groove; 8. Oil injection rod; 9. Tapered sleeve; 10. External threaded sleeve; 11. Lubrication mechanism; 12. Conical surface; 13. Sealing sleeve; 14. Oil injection through hole. Detailed Implementation

[0018] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0019] like Figures 1 to 3 As shown, a turbine hydraulic bolt removal ring includes a coupling coupling 1. A coupling washer 3 is fitted to one side of the coupling coupling 1, and a coupling coupling 2 is provided on one side of the coupling washer 3. A positioning mechanism 4 is provided inside the coupling coupling 2. The positioning mechanism 4 locks the connection between the coupling coupling 1 and the coupling coupling 2, thereby achieving the expected force between the bolt cone 6 and the coupling bolt hole. The lubrication mechanism 11 provides pressure to the mating surface between the bolt cone 6 and the cone sleeve 9 through the oil injection hole and oil groove of the coupling coupling 1 and the coupling coupling 2 using the oil injection method.

[0020] In this embodiment, the positioning mechanism 4 includes a coupling pair 2, a coupling washer 3, a nut 5, a bolt cone 6, a cone sleeve 9, and an external threaded sleeve 10. The coupling washer 3 is fitted to one side of the coupling pair 2. Nuts 5 are connected through the outer sides of both the coupling pair 2 and the coupling pair 1. The nuts 5 are installed on both sides of the bolt cone 6. The outer side of the bolt cone 6 is wrapped with a cone sleeve 9. The external threaded sleeve 10 is connected to the nut 5 to lock the coupling pair 1 and the coupling pair 2.

[0021] In this embodiment, the bolt cone 6 is connected to one end of the oil injection rod 8 through a conical surface 12 on one side. The connection between the conical surface 12 and one side of the oil injection rod 8 facilitates the stability of oil injection.

[0022] In this embodiment, the lubrication mechanism 11 includes a bolt cone 6, an external thread groove 7, an oil injection rod 8, a conical surface 12, a sealing sleeve 13, and an oil injection through hole 14. The external thread groove 7 is formed on one side of the oil injection rod 8. A conical surface 12 is provided on one side of the bolt cone 6. A sealing sleeve 13 is provided on one side of the conical surface 12. An oil injection through hole 14 is provided on one side of the sealing sleeve 13. The conical surface 12 is used to quickly connect and disconnect one side of the oil injection rod 8.

[0023] In this embodiment, the bolt cone 6 is connected to the cone sleeve 9 through an internally through-hole 14, and oil is injected and delivered through the oil injection hole 14 inside the bolt cone 6.

[0024] In this embodiment, the coupling wheel 1 is connected to the outside of the bolt cone 6 via a nut 5 on one side, and the two sides of the bolt cone 6 are threaded together via the nut 5.

[0025] In practical applications, this type of turbine hydraulic bolt removal ring includes the following tasks:

[0026] Step 1: At the mounting end of the bolt cone 6 (the end with the smaller diameter of the cone), screw the oil injection rod 8 completely into the thread inside the bolt cone 6. Using the oil injection method, pressure is applied to the mating surface between the bolt cone 6 and the cone sleeve 9 through the oil injection through-hole 14 and the oil groove inside the oil injection rod 8. As the pressure increases (maximum pressure up to 150 MPa), the cone sleeve 9 loosens from the bolt cone 6 and returns to its original diameter, thus releasing the interference fit.

[0027] Step 2: During use, firstly, fit one side of coupling coupling 1 against coupling washer 3, then fit coupling coupling 2 against one side of coupling washer 3. Next, insert the tapered sleeve 9 into the interior of coupling coupling 1, coupling coupling 2, and coupling washer 3. Then, insert the bolt cone 6 into the interior of coupling coupling 1, coupling coupling 2, and coupling washer 3 in sequence. Finally, thread the nut 5 onto the outside of the external threaded sleeve 10 on both sides of the bolt cone 6. Lock coupling coupling 1 and coupling coupling 2 through the nut 5 and the external threaded sleeve 10.

[0028] Therefore, the above-disclosed embodiments are merely illustrative in all respects and are not the only ones. All modifications within the scope of this utility model or its equivalents are included in this utility model.

Claims

1. A hydraulic bolt removal ring for a steam turbine, characterized in that: The coupling includes a first coupling wheel (1), a coupling washer (3) is fitted on one side of the first coupling wheel (1), a second coupling wheel (2) is provided on one side of the coupling washer (3), and a positioning mechanism (4) is provided inside the second coupling wheel (2). The positioning mechanism (4) locks the connection between the first coupling wheel (1) and the second coupling wheel (2), so that the bolt cone (6) and the coupling bolt hole achieve the expected force. The lubrication mechanism (11) provides pressure to the joint surface between the bolt cone (6) and the cone sleeve (9) through the oil injection hole and oil groove of the first coupling wheel (1) and the second coupling wheel (2).

2. The turbine hydraulic bolt removal ring according to claim 1, characterized in that: The positioning mechanism (4) includes a coupling pair 2 (2), a coupling washer (3), a nut (5), a bolt cone (6), a cone sleeve (9), and an external threaded sleeve (10). A coupling washer (3) is fitted to one side of the coupling pair 2 (2). Nuts (5) are connected through the outer sides of both the coupling pair 2 (2) and the coupling pair 1 (1). Nuts (5) are installed on both sides of the bolt cone (6). A cone sleeve (9) is wrapped around the outer side of the bolt cone (6).

3. A turbine hydraulic bolt removal ring according to claim 2, characterized in that: The bolt cone (6) is connected to one end of the oil injection rod (8) through a conical surface (12) on one side.

4. A turbine hydraulic bolt removal ring according to claim 1, characterized in that: The lubrication mechanism (11) includes a bolt cone (6), an external thread groove (7), an oil injection rod (8), a conical surface (12), a sealing sleeve (13), and an oil injection through hole (14). The external thread groove (7) is opened on one side of the oil injection rod (8). A conical surface (12) is provided on one side of the bolt cone (6). A sealing sleeve (13) is provided on one side of the conical surface (12). An oil injection through hole (14) is provided on one side of the sealing sleeve (13).

5. A turbine hydraulic bolt removal ring according to claim 4, characterized in that: The bolt cone (6) is connected to the cone sleeve (9) through an internally through-hole (14).

6. A turbine hydraulic bolt removal ring according to claim 1, characterized in that: The coupling wheel 1 (1) is connected to the outside of the bolt cone (6) by a nut (5) provided on one side.

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