Marine steam turbine anti-shock structure with damping device

Abstract

The application relates to a marine steam turbine anti-impact structure with a damping device, which comprises a limiting stopper, a resistance rubber block and a viscous damper, the limiting stopper is in a U-shaped structure as a whole, the limiting stopper is fixed on a common frame through fastening bolts and is connected with a steam turbine foot through a shear pin; the resistance rubber block is installed between the steam turbine foot and the limiting stopper, one side of the viscous damper is connected with the steam turbine foot, and the other side is connected with a movable plate. The marine steam turbine anti-impact structure with the damping device fully utilizes the existing space, improves the anti-impact capacity of the steam turbine, and enables the unit to have the self-recovery capacity after impact. The safety and the maintainability of the unit after impact are greatly improved, and the structure can be extended and applied to other marine steam turbines.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of marine steam turbine foot structure, especially a kind of marine steam turbine impact resistance structure. BACKGROUND

[0002] The foot is one of important components for fixing steam turbine and public frame. The existing marine steam turbine is mostly fixed using cat paw structure, as shown in Fig. 1. The existing marine steam turbine foot is composed of fastening bolt, limiting block and cushion block. The limiting block is connected with the public frame through bolt, and the cushion block is placed between the limiting block and the public frame for adjustment. The steam turbine foot is connected with the public frame through the limiting block and the cushion block. Such connection mode enables the steam turbine foot to have the ability of thermal expansion along the axial direction of the unit. However, when the structure encounters a large lateral impact, the fracture of the fastening bolt will cause the steam turbine foot to completely lose fixation, resulting in a large displacement of the unit. Figure 1 SUMMARY

[0003] The present application proposes a marine steam turbine impact resistance structure with damping device, which can realize fixation of the unit under a large impact.

[0004] To achieve the above-mentioned purpose, the technical solution of the present application is as follows: a marine steam turbine impact resistance structure with damping device, comprising a limiting block, a resistance rubber block and a viscous damper. The limiting block is in overall U-shaped structure. The limiting block is fixed on the public frame through fastening bolt and connected with the steam turbine foot through shear pin. The resistance rubber block is installed between the steam turbine foot and the limiting block. One side of the viscous damper is connected with the steam turbine foot, and the other side is connected with a movable plate.

[0005] Further, the movable plate is shorter than the length of the middle section of the U-shaped structure of the limiting block and connected with the limiting block through key groove structure.

[0006] Further, a slot hole is opened on the limiting block to connect the shear pin, so that the shear pin has a certain thermal expansion direction movement space when the steam turbine foot expands due to heat.

[0007] Further, the resistance rubber block is composed of upper and lower connecting steel plates, high-damping rubber plate and lead core. After the resistance rubber plate is plastically deformed under external impact, the lead core can produce plastic deformation of hysteresis damping, and provide horizontal restoring force through rubber.

[0008] Further, the viscous damper is composed of cylinder, piston and viscous damping material inside. The piston can reciprocate in the cylinder. The piston has a plurality of small holes. The cylinder is filled with viscous damping material.

[0009] ​Further, in use, first, the steam turbine is installed on the common frame, the resistance rubber block is installed between the limiting block and the steam turbine foot, the limiting block and the common frame are installed through the fastening bolt, then the shear pin is installed to determine the relative position between the limiting block and the steam turbine foot, then the movable plate is installed, and the viscous damper is installed between the movable plate and the steam turbine foot.

[0010] The beneficial effects of the present application are:

[0011] The marine steam turbine impact-resistant structure with damping device provided by the present application makes full use of the existing space, improves the impact resistance of the steam turbine, and enables the unit to have the self-recovery ability after impact. The safety and maintainability of the unit after impact are greatly improved, and the structure can be extended and applied to other marine steam turbines. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is a schematic diagram of the existing steam turbine foot;

[0013] Figure 2 It is a top view of the marine steam turbine foot structure with damping device of the present application;

[0014] Figure 3 It is an A-A sectional view of Figure 2

[0015] Figure 4 It is a B-B sectional view of Figure 2 DETAILED DESCRIPTION

[0016] The present application will be further described below in combination with the drawings and examples.

[0017] As shown in the drawings, the embodiment of the present application provides a marine steam turbine impact-resistant structure with damping device. The structure adopts two kinds of impact-resistant components, resistance rubber block 3 and viscous damper 4, to reduce vibration and energy dissipation when the steam turbine is subjected to a large impact. The main structure includes resistance rubber block 3, shear pin 2, limiting block 7, fastening bolt 6 and movable plate 5. Figures 2 to 4 The limiting block 7 is in the form of a U-shaped structure as a whole, wherein the two sides of the limiting block 7 are A-A sectional structures, and the middle of the limiting block 7 is a B-B sectional structure.

[0018]

[0019] ​​​A-A section uses resistance rubber block 3 to resist impact energy dissipation. Limiting block 7 is fixed on public rack 8 through fastening bolt 6, limiting block 7 is connected with steam turbine foot 1 through shear pin 2, resistance rubber block 3 is installed between steam turbine foot 1 and limiting block 7. Shear pin 2 is a slot hole corresponding to the hole in limiting block 7, when steam turbine foot 1 expands, shear pin 2 has a certain thermal expansion direction space. Resistance rubber block 3 is composed of upper and lower connecting steel plate, high damping rubber plate and lead core, after the plastic deformation of resistance rubber plate under external impact, lead core can produce hysteresis damping plastic deformation, and provide horizontal restoring force through rubber.

[0020] B-B section uses viscous damper 4 to resist impact energy dissipation. Viscous damper 4 is connected with steam turbine foot 1 on one side and movable plate 5 on the other side. Movable plate 5 is slightly shorter than the length of the middle segment of U-shaped structure of limiting block 7, and is connected with limiting block 7 through key groove structure. Movable plate 5 can move in the thermal expansion direction, so that viscous damper 4 has a certain thermal expansion direction space. Viscous damper 4 is generally composed of cylinder, piston and damping material inside. The piston can reciprocate in the cylinder, the piston has a certain amount of holes, and the cylinder contains viscous damping material. When viscous damper 4 is subjected to rapid impact force, it has a certain rigidity and almost cannot displace. At this time, the cutter bar of viscous damper 4 is pushed to move the piston under the action of external force, and the damping material on both sides of the piston produces a large pressure difference. The damping material passes through the damping hole to generate damping force. The temperature of the silicon oil medium inside the viscous damper 4 rises under the action of external work, achieving the purpose of impact energy dissipation.

[0021] In daily use, the unit foot is fixed through the shear pin and the limiting block, and the limiting block is connected with the public rack through the fastening bolt with greater strength. When the marine steam turbine is impacted, the shear pin is sheared by the impact force, the support is slightly displaced, and the viscous damper acts to absorb the impact generated by the transverse displacement of the steam turbine and convert the related impact into heat energy of the silicon oil medium inside the oil cylinder. After the impact, the unit gradually resets under the action of the horizontal restoring force of the resistance rubber block, and the viscous damper has small rigidity under low speed displacement, which will not produce large resistance. When the unit is maintained, the shear pin is replaced, so that the unit can be restored.

[0022] In use, first, install the steam turbine on the public rack, install the resistance rubber block between the limiting block and the steam turbine foot, install the limiting block and the public rack through the fastening bolt, and then install the shear pin to determine the relative position between the limiting block and the steam turbine foot. Install the movable plate and install the viscous damper between the movable plate and the steam turbine foot, and the installation of the anti-impact structure of the marine steam turbine with damping device is completed.

Claims

1. A shock-resistant structure for a marine steam turbine with a damping device, characterized in that: The device includes a limit stop, a resistance rubber block, and a viscous damper. The limit stop has an overall U-shaped structure and is fixed to the common frame by fastening bolts and connected to the turbine foot via shear pins. The resistance rubber block is installed between the upper outer side of the turbine foot and the upper inner side of the limit stop. One side of the viscous damper is connected to the turbine foot, and the other side is connected to a movable plate. The movable plate is shorter than the middle section of the U-shaped structure of the limit stop and is connected to the limit stop via a keyway structure. The movable plate can move in the thermal expansion direction, giving the viscous damper a certain amount of space for movement in the thermal expansion direction.

2. The marine steam turbine impact-resistant structure with damping device according to claim 1, characterized in that: The limiting block has a slotted hole for connecting the anti-shear pin, which allows the anti-shear pin to have a certain amount of room to move in the direction of thermal expansion when the turbine feet expand thermally.

3. The marine steam turbine impact-resistant structure with damping device according to claim 1, characterized in that: The resistance rubber block consists of upper and lower connecting steel plates, a high-damping rubber plate, and a lead core. After the resistance rubber plate undergoes plastic deformation under external impact, the lead core can generate hysteretic damping plastic deformation and provide horizontal restoring force through the rubber.

4. The marine steam turbine impact-resistant structure with damping device according to claim 1, characterized in that: The viscous damper is composed of a cylinder, a piston, and viscous damping material. The piston can reciprocate within the cylinder. The piston has several small holes, and the cylinder is filled with viscous damping material.

5. The marine steam turbine impact-resistant structure with damping device according to claim 1, characterized in that: In use, the turbine is first installed on the common frame. A resistance rubber block is installed between the limit stop and the turbine foot. The limit stop and the common frame are then installed by tightening bolts. Shear pins are then installed to determine the relative position between the limit stop and the turbine foot. A movable plate is then installed, and a viscous damper is installed between the movable plate and the turbine foot.

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