A pressure-balanced expansion joint for cooling water pipes of marine steam turbines

Abstract

This utility model relates to the field of expansion joint technology and discloses a water pressure balance expansion joint for cooling water pipelines of marine steam turbines, which solves the problem of unbalanced force in current expansion joints. It includes a bellows, with connecting flanges fixedly connected to both ends. A buffer mechanism is provided on the outer side of the bellows, comprising an outer ring located outside the bellows between the two connecting flanges. Two vertical cylinders are symmetrically fixedly sleeved on the outer ring, and two movable columns are symmetrically movably sleeved inside the vertical cylinders. Each movable column extends to one end of the vertical cylinder and is fixedly connected to a vertical plate. The two vertical plates are respectively fixed to the sides of the two connecting flanges that are close to each other. This utility model facilitates the deformation of spring two, thereby buffering the bellows under the elastic force of spring two and spring one, thus ensuring uniform force distribution throughout the expansion joint during use.

Description

Technical Field

[0001] This utility model belongs to the field of expansion joint technology, specifically a water pressure balance expansion joint for cooling water pipelines of ship steam turbines. Background Technology

[0002] The pressure balance expansion joint for cooling water pipelines of marine steam turbines is a dynamic compensation device installed in the pipelines of the steam turbine cooling system. Its core function is to compensate for the thermal expansion and contraction displacement of the pipeline caused by temperature fluctuations through the elastic deformation of the bellows, and at the same time, to counteract the thrust generated by the medium pressure through the balancing mechanism, so as to avoid leakage or fatigue damage to the pipeline system due to stress concentration.

[0003] However, existing pipe expansion joints are subject to unbalanced forces during installation, which can easily lead to positioning deviations and thus significantly limit their overall usability. Utility Model Content

[0004] In order to overcome the shortcomings of the prior art, this utility model provides a water pressure balance expansion joint for the cooling water pipeline of a ship turbine, which effectively solves the problem of unbalanced force on the current expansion joint.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a water pressure balance expansion joint for a ship turbine cooling water pipeline, comprising a bellows, both ends of which are fixedly connected to connecting flanges, and a buffer mechanism is provided on the outside of the bellows; The buffer mechanism includes an outer ring located outside the bellows, between two connecting flanges. Two vertical cylinders are symmetrically fixedly sleeved on the outer ring. Two movable columns are symmetrically movably sleeved inside the vertical cylinders. Each movable column extends to one end of the vertical cylinder and is fixedly connected to a vertical plate. The two vertical plates are respectively fixed to the sides of the two connecting flanges that are close to each other. A spring is fixedly connected between each of the two vertical plates and the vertical cylinder. The two springs are respectively sleeved on the outside of the two movable columns.

[0006] Preferably, the outer side of the vertical cylinder is provided with two side grooves symmetrically, and the inner side of each side groove is slidably connected with a side block.

[0007] Preferably, two guide posts are symmetrically fixedly connected to the outer side of the outer ring. A side plate is fixedly connected to the end of the guide post away from the outer ring. A guide block is movably sleeved on the outer side of the guide post. A second spring is fixedly connected between the guide block and the side plate. The second spring is sleeved on the outer side of the guide post. A movable rod is rotatably connected to the outer side of the side block. The end of the movable rod away from the side block is rotatably connected to the outer side of the guide block.

[0008] Preferably, the outer side of the guide post is provided with a limiting groove, and the inner side of the guide block is fixedly connected to a limiting block, with the limiting block and the limiting groove being slidably connected.

[0009] Preferably, two double-ended screws are symmetrically arranged on the outer side of the bellows, and two connecting flanges are movably sleeved on the outer side of the two double-ended screws, with the outer ring fixedly sleeved on the outer side of the two double-ended screws.

[0010] Preferably, two limiting nuts are symmetrically provided on the side of the connecting flange away from the bellows. A gasket is provided between the two limiting nuts and the connecting flange. The two gaskets are respectively sleeved on the outside of the two double-ended screws, and the two limiting nuts are respectively threaded onto the outside of the two double-ended screws.

[0011] Compared with the prior art, the beneficial effects of this utility model are: 1. Through the cooperation between the vertical plate, movable column, vertical cylinder, side block and side groove, the first spring is able to deform when the bellows expands and contracts. Through the cooperation between the movable rod, guide block, guide column, side plate, limiting groove and limiting block, the second spring is able to deform. Thus, the bellows can be buffered under the action of the elastic force of the second spring and the first spring, thereby ensuring that the entire expansion joint can be evenly stressed during use. 2. The bellows is easily limited by the connection between the flange and the double-ended threaded rod, as well as the gasket and the limit nut, to prevent excessive stretching. Attached Figure Description

[0012] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation thereof.

[0013] In the attached diagram: Figure 1 This is a schematic diagram of the water pressure balance expansion joint structure for the cooling water pipeline of a ship turbine according to this utility model; Figure 2 This is a schematic diagram of the buffer mechanism structure of this utility model; Figure 3 This is a schematic diagram of the outer ring structure of this utility model; Figure 4 This is a schematic diagram of the guide column structure of this utility model.

[0014] In the diagram: 1. Bellows; 2. Buffer mechanism; 201. Outer ring; 202. Double-ended screw; 203. Gasket; 204. Limit nut; 205. Movable column; 206. Vertical plate; 207. Spring 1; 208. Vertical cylinder; 209. Guide column; 2010. Side block; 2011. Side groove; 2012. Side plate; 2013. Guide block; 2014. Movable rod; 2015. Spring 2; 2016. Limit groove; 2017. Limit block; 3. Connecting flange. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0016] Example 1, by Figure 1 The present invention relates to a water pressure balance expansion joint for a marine steam turbine cooling water pipeline, comprising a bellows 1, both ends of which are fixedly connected to a connecting flange 3, and a buffer mechanism 2 is provided on the outer side of the bellows 1.

[0017] Specifically, by Figure 2-4 The buffer mechanism 2 includes an outer ring 201 located outside the bellows 1, between two connecting flanges 3. Two vertical cylinders 208 are symmetrically fixedly sleeved on the outer ring 201. Two movable columns 205 are symmetrically movably sleeved inside the vertical cylinders 208. Each movable column 205 extends to one end of the vertical cylinder 208 and is fixedly connected to a vertical plate 206. The two vertical plates 206 are respectively fixed to the sides of the two connecting flanges 3 that are close to each other. Springs 207 are fixedly connected between the two vertical plates 206 and the vertical cylinders 208. The two springs 207 are respectively sleeved on the outside of the two movable columns 205. Two side grooves 2011 are symmetrically provided on the outside of the vertical cylinders 208. Side blocks 2010 are slidably connected to the inner sides of the two side grooves 2011. Two guide posts 209 are symmetrically fixedly connected to the outer side of the outer ring 201. A side plate 2012 is fixedly connected to the end of the guide post 209 away from the outer ring 201. A guide block 2013 is movably sleeved on the outer side of the guide post 209. A spring 2015 is fixedly connected between the guide block 2013 and the side plate 2012. The spring 2015 is sleeved on the outer side of the guide post 209. A movable rod 2014 is rotatably connected to the outer side of the side block 2010. The end of the movable rod 2014 away from the side block 2010 is rotatably connected to the outer side of the guide block 2013. A limiting groove 2016 is provided on the outer side of the guide post 209. A limiting block 2017 is fixedly connected to the inner side of the guide block 2013. The limiting block 2017 is slidably connected to the limiting groove 2016. In operation, when the bellows 1 expands or contracts, it moves the connecting flange 3, which in turn moves the movable column 205 along the length of the vertical cylinder 208 via the vertical plate 206. At this time, the first spring 207 deforms, and the side block 2010 slides along the side groove 2011. Then, the movable rod 2014 drives the guide block 2013 to slide along the guide column 209, while the limiting block 2017 slides along the limiting groove 2016, ensuring the stability of the guide block 2013 when it moves on the guide column 209. At this time, the second spring 2015 deforms, and under the action of the elastic force of the second spring 2015 and the first spring 207, it buffers the bellows 1, finally ensuring that the entire expansion joint is evenly stressed during use.

[0018] Specifically, by Figure 2 As shown, two double-ended screws 202 are symmetrically arranged on the outer side of the bellows 1. Two connecting flanges 3 are movably sleeved on the outer side of the two double-ended screws 202. An outer ring 201 is fixedly sleeved on the outer side of the two double-ended screws 202. Two limiting nuts 204 are symmetrically arranged on the side of the connecting flange 3 away from the bellows 1. A gasket 203 is provided between the two limiting nuts 204 and the connecting flange 3. The two gaskets 203 are respectively sleeved on the outer side of the two double-ended screws 202, and the two limiting nuts 204 are respectively threaded on the outer side of the two double-ended screws 202. In use, first rotate each limit nut 204 to adjust the distance between the two connecting flanges 3, thereby limiting the bellows 1 and preventing excessive stretching of the bellows 1.

Claims

1. A pressure-balanced expansion joint for cooling water pipes of a marine steam turbine, comprising a bellows (1), characterized in that: Both ends of the bellows (1) are fixedly connected to connecting flanges (3), and a buffer mechanism (2) is provided on the outside of the bellows (1). The buffer mechanism (2) includes an outer ring (201) located outside the bellows (1). The outer ring (201) is located between two connecting flanges (3). Two vertical cylinders (208) are symmetrically fixedly sleeved on the outer ring (201). Two movable columns (205) are symmetrically movably sleeved inside the vertical cylinders (208). A vertical plate (206) is fixedly connected to one end of each of the two movable columns (205) extending to the vertical cylinder (208). The two vertical plates (206) are respectively fixed to the side of the two connecting flanges (3) that are close to each other. A spring (207) is fixedly connected between the two vertical plates (206) and the vertical cylinder (208). The two springs (207) are respectively sleeved on the outside of the two movable columns (205). Two side grooves (2011) are symmetrically provided on the outside of the vertical cylinder (208). A side block (2010) is slidably connected to the inside of each of the two side grooves (2011). Two guide posts (209) are symmetrically fixedly connected to the outer side of the outer ring (201). A side plate (2012) is fixedly connected to the end of the guide post (209) away from the outer ring (201). A guide block (2013) is movably sleeved on the outer side of the guide post (209). A spring (2015) is fixedly connected between the guide block (2013) and the side plate (2012). The spring (2015) is sleeved on the outer side of the guide post (209). A movable rod (2014) is rotatably connected to the outer side of the side block (2010). The end of the movable rod (2014) away from the side block (2010) is rotatably connected to the outer side of the guide block (2013). A limiting groove (2016) is provided on the outer side of the guide post (209). A limiting block (2017) is fixedly connected to the inner side of the guide block (2013). The limiting block (2017) is slidably connected to the limiting groove (2016).

2. The water pressure balance expansion joint for a marine steam turbine cooling water pipeline according to claim 1, characterized in that: Two double-ended screws (202) are symmetrically arranged on the outer side of the bellows (1), and two connecting flanges (3) are movably sleeved on the outer side of the two double-ended screws (202). The outer ring (201) is fixedly sleeved on the outer side of the two double-ended screws (202).

3. The water pressure balance expansion joint for a marine steam turbine cooling water pipeline according to claim 1, characterized in that: Two limiting nuts (204) are symmetrically provided on the side of the connecting flange (3) away from the bellows (1). A gasket (203) is provided between the two limiting nuts (204) and the connecting flange (3). The two gaskets (203) are respectively sleeved on the outside of the two double-ended screws (202), and the two limiting nuts (204) are respectively threaded onto the outside of the two double-ended screws (202).

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