A kind of steam turbine sliding pin system jamming auxiliary expansion device

Abstract

The utility model relates to thermal expansion technical field of steam turbine unit of thermal power plant, specifically disclose a kind of steam turbine sliding pin system jam auxiliary expansion device. The device includes front box, base platform and auxiliary device, wherein auxiliary device is composed of positioning pin, locating block, force transmission frame, hydraulic jack and L-shaped support frame. Auxiliary device is symmetrically arranged in the two sides of front box AB, and by hydraulic jack, the thrust is exerted, and the tensile force to front box is converted through force transmission frame and locating block, and auxiliary front box slides, and the expansion resistance of steam cylinder is reduced. L-shaped support frame is connected using base platform gap, to avoid cantilever beam cracking;Locating block is fixed by welding and positioning pin double, to improve bearing capacity. The utility model is simple in structure, and drive is stable, and can effectively solve the expansion difference problem caused by sliding pin system jam, to ensure the safe operation of unit.

Description

Technical Field

[0001] This utility model relates to the field of thermal expansion technology for steam turbine units in thermal power plants, and in particular to an auxiliary expansion device for a steam turbine sliding pin system that is stuck, used to solve the problem of poor cylinder expansion caused by the sticking of the sliding pin system. Background Technology

[0002] When a steam turbine starts up, stops, or operates under varying loads, the rotor and cylinder expand or contract due to temperature changes, generating differential expansion. The sliding pin system, including horizontal and vertical pins, is prone to jamming and corrosion after long-term operation, leading to increased cylinder expansion resistance, excessive differential expansion, and problems such as unit vibration, increased bearing temperature, and rotor-stator rubbing. In severe cases, shutdown and maintenance are required.

[0003] Traditional solutions to this problem have significant drawbacks: 1. Periodic manual tapping: The applied force and direction are uncontrollable, easily leading to uneven stress on the housing and causing tilting, or even damaging the sliding pin system itself. This is a crude and high-risk operation. 2. Forced loosening after jamming: Inefficient, causing unplanned downtime and significant economic losses. 3. Inherent deficiency: Existing technology lacks a dedicated device that can be integrated into the unit, is controllable, proactively prevents jamming, and does not damage the equipment. Therefore, there is an urgent need in this field for an auxiliary expansion solution that can fundamentally, safely, and efficiently solve the problem of sliding pin system jamming. Summary of the Invention

[0004] This invention addresses the shortcomings of existing technologies in providing safe, controllable, and proactive solutions for slippage in turbine slippage systems by offering an auxiliary expansion device for slippage in steam turbine systems. The invention's effectiveness lies not only in the improvement of individual components but also in the unexpected technical effects resulting from the coordinated connection and layout of these components.

[0005] This utility model is implemented using the following technical solution: a turbine sliding pin system jamming auxiliary expansion device, comprising a front housing and a base plate, characterized in that: it includes auxiliary devices symmetrically arranged on both sides of the front housing; the auxiliary devices include: a positioning block fixedly connected to the front housing; an L-shaped support frame fixedly connected to the base plate, one end of a hydraulic jack acting on the L-shaped support frame; a force transmission frame connected between the other end of the hydraulic jack and the positioning block; the thrust generated by the hydraulic jack is converted into a pulling force on the positioning block through the force transmission frame, thereby causing the front housing to slide relative to the base plate.

[0006] The aforementioned turbine sliding pin system locking auxiliary expansion device is characterized in that: the positioning block is connected to the front housing by welding and is provided with a positioning pin hole; the positioning pin passes through the positioning pin hole and is inserted into the interior of the front housing. The L-shaped support frame includes a vertical beam and a horizontal beam located at the bottom of the vertical beam, the horizontal beam being fixedly connected to the foundation plate, so that the L-shaped support frame constitutes a non-cantilever beam load-bearing structure.

[0007] The aforementioned turbine sliding pin system anti-locking expansion device is characterized in that: the auxiliary device is symmetrically arranged on both sides AB of the front housing, and can apply a balanced pulling force to both sides AB of the front housing to ensure that the front housing slides in a straight line and prevents deflection. The positioning block is welded to the front housing; the L-shaped support frame is welded to the base plate.

[0008] This invention utilizes hydraulic drive, resulting in a smooth and labor-saving process that avoids equipment damage. Practical verification has shown that this device can smoothly increase the expansion of the high and medium pressure cylinders of the unit by about 1mm, thereby reducing the expansion difference by 1mm. The temperature of key components, such as the second bearing, decreases by 3-5℃ under the same operating conditions. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0010] Figure 2 This is a schematic diagram of the auxiliary device structure.

[0011] Figure 3 This is a schematic diagram of the load-bearing principle of the device.

[0012] Figure 4 This is a schematic diagram of the symmetrical arrangement of the auxiliary devices on sides AB.

[0013] Figure 5 This is a schematic diagram of the load-bearing capacity of the L-shaped support frame.

[0014] Figure 6 This is a schematic diagram of the connection between the positioning block and the positioning pin.

[0015] In the diagram: 1-base platform, 2-auxiliary device, 3-front box, 201-positioning pin, 202-positioning block, 203-force transmission frame, 204-hydraulic jack, 205-L-shaped support frame. Detailed Implementation

[0016] The present invention will now be further described with reference to the accompanying drawings. Figure 1 As shown, the device includes a front housing 3, auxiliary devices 2, and a base plate 1. The auxiliary devices 2 are symmetrically installed on both sides of the front housing 3.

[0017] like Figure 2The auxiliary device 2 includes a positioning pin 201, a positioning block 202, a force transmission frame 203, a hydraulic jack 204, and a support frame 205. The positioning block 202 is welded to the front housing 3 and fixed by the positioning pin 201; the L-shaped support frame 205 is welded to the base plate 1. One end of the hydraulic jack 204 abuts against the support frame 205, and the other end pushes the force transmission frame 203. The force transmission frame 203 transmits the force to the positioning block 202, thereby generating a pulling force on the front housing 3.

[0018] like Figure 3 The force transmission path is as follows: the hydraulic jack 204 outputs force F1 to the force transmission frame 203, which is converted into F2 and acts on the positioning block 202, causing the front box 3 to slide; the support frame 205 bears the reaction force F3, and the base plate 1 provides the support force F4.

[0019] See Figure 4 The symmetrical arrangement of the auxiliary device 2 on sides AB ensures that the front housing 3 is subjected to balanced forces, thus ensuring the balance of the pulling force F2. like Figure 5 The unique structure of the L-shaped support frame (205) utilizes the gap connection of the foundation plate 1, and a horizontal beam is provided at the bottom of the vertical beam. The horizontal beam provides key support, and the forces F3 and F4 are balanced here to avoid cracking of the cantilever beam structure.

[0020] like Figure 6 The positioning block 202 sets the positioning pin hole, and the positioning pin 201 is inserted into the front housing 3 to share the tensile force and prevent the weld from cracking.

[0021] This utility model has a compact structure, is easy to install, and is suitable for retrofitting existing steam turbines, effectively improving operational reliability.

Claims

1. A turbine sliding pin system jamming auxiliary expansion device, comprising a front housing (3) and a base plate (1), characterized in that: It also includes auxiliary devices (2) symmetrically arranged on both sides of the front box (3); the auxiliary devices (2) include: a positioning block (202) fixedly connected to the front box (3); an L-shaped support frame (205) fixedly connected to the base plate (1), one end of a hydraulic jack (204) acting on the L-shaped support frame (205); a force transmission frame (203) connected between the other end of the hydraulic jack (204) and the positioning block (202); the thrust generated by the hydraulic jack (204) is converted into a pulling force on the positioning block (202) through the force transmission frame (203), thereby driving the front box (3) to slide relative to the base plate (1).

2. The turbine sliding pin system jamming auxiliary expansion device as described in claim 1, characterized in that: The positioning block (202) is connected to the front box (3) by welding and is provided with a positioning pin hole; the positioning pin (201) passes through the positioning pin hole and is inserted into the front box (3).

3. The turbine sliding pin system jamming auxiliary expansion device as described in claim 1, characterized in that: The L-shaped support frame (205) includes a vertical beam and a horizontal beam located at the bottom of the vertical beam. The horizontal beam is fixedly connected to the foundation plate (1), so that the L-shaped support frame (205) constitutes a non-cantilever beam load-bearing structure.

4. The turbine sliding pin system jamming auxiliary expansion device according to any one of claims 1 to 3, characterized in that: The auxiliary device (2) is symmetrically arranged on both sides of the front box (3), which can apply a balanced pulling force to both sides of the front box (3) to ensure that the front box (3) slides in a straight line and prevents it from tilting.

5. The auxiliary expansion device for jamming in a turbine sliding pin system as described in claim 1, characterized in that: The positioning block (202) is connected to the front box (3) by welding.

6. The auxiliary expansion device for jamming in a turbine sliding pin system as described in claim 1, characterized in that: The L-shaped support frame (205) is connected to the base plate (1) by welding.

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