An adjustable and replaceable device for reducing vibration of rotating equipment in marine environments.

Abstract

This utility model discloses an adjustable and replaceable device for reducing vibration of rotating equipment in marine environments, comprising: an outer pipe, a main shaft, and a bearing bracket. The outer pipe is coaxially arranged with the main shaft, and the bearing bracket is sleeved on the outside of the main shaft. An annular groove is provided on the inner wall of the outer pipe at a position corresponding to that of the bearing bracket. A positioning ring is detachably installed in the annular groove. An outer ring is provided on the outer edge of the bearing bracket, and the outer ring cooperates with the positioning ring. The positioning ring reduces the fitting gap, improves the overall stability of the bearing bracket and the outer pipe, and thus enhances the stability of the bearing and pump unit. It can reduce the vibration amplitude of the rotating equipment and improve the long-term safe and stable operation capability of the rotating equipment in marine environments. The addition of the 316L positioning ring simplifies on-site construction, and the positioning ring can be adjusted and replaced in a timely manner according to the subsequent vibration of the rotating equipment.

Description

Technical Field

[0001] This utility model belongs to the field of pump body vibration reduction technology, and specifically relates to an adjustable and replaceable device for reducing the vibration of rotating equipment in marine environments. Background Technology

[0002] In the existing technology, each unit of a coastal power plant is equipped with a seawater circulation cooling system. This system has two vertical high-flow-rate rotating devices. Whether the rotating devices can operate safely and stably for a long period of time is directly related to the operating efficiency and safety of the unit. An interruption of the seawater circulation system supply may cause a major shutdown accident.

[0003] The main functions and characteristics of the rotating equipment are: ① To transport seawater to equipment such as condensers and heat exchangers, maintaining stable equipment temperature by cooling high-temperature media (such as turbine exhaust steam and closed-loop cooling water), preventing overheating and malfunctions. ② To maintain the vacuum level of the unit's condenser. The rotating equipment continuously supplies seawater to the condenser, ensuring rapid condensation of turbine exhaust steam, thereby maintaining a high vacuum environment inside the condenser. If the seawater supply is interrupted, the vacuum level will drop, forcing the unit to reduce load or even shut down. ③ To save energy and reduce consumption. Seawater resources are recycled, and cooled seawater is reused in the circulation, reducing water consumption. ④ The design features a large flow rate and low head, which meets the requirements of high efficiency and low energy consumption operation due to the need to transport a large amount of seawater and the low system resistance.

[0004] The rotating equipment mainly consists of a pump casing, external pipe, guide impeller, bearing support, pump shaft, and impeller. The bearing support and external pipe of the rotating equipment each play important roles in the operation of the equipment. Replacing them individually is expensive. Their specific functions in the system are as follows:

[0005] ① The main function of the bearing bracket is to support and position the pump shaft. The bearing bracket is used to fix the bearing housing, ensure the stable rotation of the pump shaft, withstand radial and axial forces, maintain the alignment of the shaft, reduce vibration and wear, and maintain the structural stability of the pump set. The bearing bracket is connected to the pump body to enhance the overall structural rigidity. Especially in vertical pumps, it is necessary to withstand the weight of the rotor and the fluid pressure to ensure safe operation.

[0006] ② The function of the external pipe is fluid transport. The external pipe connects the pump outlet to external pipelines (such as condensers and heat exchangers), smoothly discharging the liquid pressurized by the impeller to meet the system's circulation requirements. Simultaneously, it optimizes the flow path. The external pipe, in conjunction with the guide vanes and discharge bend, converts the kinetic energy of the high-speed water flow into pressure energy, reducing turbulence and resistance losses, and improving pump efficiency.

[0007] Currently, the rotating equipment operates under a periodic rotation mode, with monthly start-up and shutdown cycles. It needs to be in service for over 10 years. The external pipes are made of HT250Ni2Cr material. HT250Ni2Cr is an alloy cast iron based on gray cast iron HT250 with approximately 2% nickel (Ni) and ≥1% chromium (Cr) added, and its metallic properties provide some resistance to marine corrosion. However, due to the casting process, the corrosion resistance of HT250Ni2Cr material in marine environments is actually quite poor. Under long-term service, corrosion leads to increased clearance in the rotating equipment, ultimately causing excessive vibration and a significant decrease in equipment reliability, as detailed below:

[0008] ① High requirements for casting process

[0009] The addition of nickel and chromium increases the difficulty of casting, requiring strict control of melting temperature and cooling rate. The process can easily lead to element segregation or poor graphite morphology, affecting the stability of material properties.

[0010] ② Poor resistance to marine corrosion

[0011] While the addition of nickel and chromium can improve resistance to seawater corrosion, the actual effect is greatly affected by the casting process. If the process is not properly controlled, nickel and chromium are prone to volatilization, resulting in uneven composition. Even with the addition of nickel and chromium, it is still cast iron and requires heavy-duty anti-corrosion coatings in harsh marine environments such as seawater; otherwise, it will still rust and corrode.

[0012] ③ Corrosion leads to increased equipment clearance, causing excessive vibration.

[0013] As the service life increases, corrosion of the outer pipe casing gradually intensifies, leading to a wider gap between the bearing support and the outer pipe, which in turn causes internal uneven wear in the equipment. HT250Ni2Cr retains the brittle characteristics of gray cast iron, with low toughness and weak impact resistance. When the vibration of rotating equipment exceeds the limit, its reliability decreases significantly.

[0014] In light of the aforementioned defects, two common approaches are used: (i) replacing the entire outer nozzle of the rotating equipment; and (ii) employing a special cold welding process on the cast iron material. This restores the excessive clearance between the bearing support and the outer nozzle, thereby reducing equipment vibration. However, replacing the entire outer nozzle is costly; the cold welding repair process on cast iron is complex and still difficult to meet the requirements for long-term service in marine environments.

[0015] Therefore, this application provides an adjustable replacement device for reducing the vibration of rotating equipment in marine environments, which aims to reduce the vibration amplitude of rotating equipment and simplify the on-site construction process. Utility Model Content

[0016] This invention provides an adjustable and replaceable device for reducing vibration of rotating equipment in marine environments, aiming to solve the problems mentioned in the background art.

[0017] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0018] An adjustable and replaceable device for reducing vibration of rotating equipment in marine environments includes: an outer tube, a main shaft, and a bearing bracket. The outer tube is coaxially arranged with the main shaft, and the bearing bracket is sleeved on the outside of the main shaft. An annular groove is provided on the inner wall of the outer tube at a position corresponding to that of the bearing bracket. A positioning ring is detachably disposed in the annular groove. An outer ring is provided on the outer edge of the bearing bracket, and the outer ring cooperates with the positioning ring.

[0019] Furthermore, the positioning ring includes four identical arc segments, which are threaded to the inner wall of the annular groove by screws. Both ends of each arc segment have pre-reserved welding bevels for welding connection with adjacent arc segments.

[0020] Furthermore, the positioning ring has a plurality of holes for locking screws, which are evenly distributed on the positioning ring.

[0021] Furthermore, the positioning ring is made of 316L stainless steel.

[0022] Furthermore, the width of the annular groove is 80mm and the depth is 15mm.

[0023] Furthermore, the outer ring is made of 316L stainless steel.

[0024] Furthermore, the inner wall of the annular groove is provided with a plurality of threaded holes for engaging with the arc segment, and the threaded holes do not penetrate the outer pipe.

[0025] Compared with the prior art, the present invention has the following technical effects:

[0026] 1. The adjustable replacement device for reducing vibration of rotating equipment in marine environments described in this utility model reduces the mating clearance by setting a positioning ring, reducing the gap between the bearing bracket and the outer pipe from the original 15mm to approximately 1mm, thereby improving the overall stability of the bearing bracket and the outer pipe, and thus enhancing the stability of the bearing and pump unit. Adding a positioning ring to reduce the gap between the bearing bracket and the outer pipe reduces the vibration amplitude of the rotating equipment from 0.08mm-0.10mm before the modification to 0.04mm-0.05mm, significantly improving the long-term safe and stable operation capability of the rotating equipment in marine environments. Adding a 316L positioning ring simplifies on-site construction, allowing for timely adjustment and replacement of the positioning ring based on subsequent vibration conditions, saving on the overall replacement cost of important components of the rotating equipment, and significantly reducing maintenance costs through a small modification.

[0027] 2. The adjustable and replaceable device for reducing vibration of rotating equipment in marine environments described in this utility model can significantly improve corrosion resistance in marine environments by using 316L stainless steel as the material for the positioning ring and the outer ring. Attached Figure Description

[0028] Figure 1 This is an overall cross-sectional view of an adjustable and replaceable device for reducing vibration of rotating equipment in a marine environment, as described in this utility model.

[0029] Figure 2 This is a schematic diagram of the positioning ring of an adjustable and replaceable device for reducing vibration of rotating equipment in a marine environment, as described in this utility model.

[0030] Figure 3 This is a schematic diagram of the stop screw hole for an adjustable and replaceable device for reducing vibration of rotating equipment in a marine environment, as described in this utility model.

[0031] In the picture:

[0032] 1. External connecting pipe; 101. Annular groove;

[0033] 2. Spindle;

[0034] 3. Bearing bracket; 301, outer ring;

[0035] 4. Locating ring; 401. Arc segment; 402. Hole for locking screw. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to specific embodiments of this application and the accompanying drawings.

[0037] like Figure 1As shown, an adjustable and replaceable device for reducing vibration of rotating equipment in a marine environment includes: an outer tube 1, a main shaft 2, and a bearing bracket 3. The outer tube 1 is coaxially arranged with the main shaft 2. The bearing bracket 3 is sleeved on the outside of the main shaft 2. An annular groove 101 is provided on the inner wall of the outer tube 1 at a position corresponding to that of the bearing bracket 3. A positioning ring 4 is detachably provided in the annular groove 101. An outer ring 301 is provided on the outer edge of the bearing bracket 3, and the outer ring 301 cooperates with the positioning ring 4.

[0038] The positioning ring 4 can reduce the mating clearance, reducing the gap between the bearing bracket 3 and the outer pipe 1 from the original 15mm to about 1mm, thereby improving the overall stability of the bearing bracket 3 and the outer pipe 1, and thus enhancing the stability of the bearing and pump unit.

[0039] Adding a positioning ring 4 can reduce the gap between the bearing bracket 3 and the outer pipe 1, thereby reducing the vibration amplitude of the rotating equipment. The vibration amplitude of the rotating equipment is reduced from 0.08mm-0.10mm before the modification to 0.04mm-0.05mm, which greatly improves the long-term safe and stable operation capability of the rotating equipment in the marine environment.

[0040] The addition of the 316L positioning ring 4 simplifies on-site construction. The positioning ring 4 can be adjusted and replaced in a timely manner according to the vibration of the rotating equipment, saving the overall replacement cost of important components of the rotating equipment. This small modification significantly reduces maintenance costs.

[0041] like Figure 2 As shown, the positioning ring 4 includes four identical arc segments 401. The arc segments 401 are threadedly connected to the inner wall of the annular groove 101 by screws. Both ends of the arc segments 401 are reserved for welding bevels for welding connection with adjacent arc segments 401.

[0042] In one specific embodiment, each arc segment 401 is secured to the annular groove 101 inside the outer pipe 1 with two M12 countersunk screws. A welding bevel is reserved between each arc segment 401, and the segments are welded and polished using argon arc welding wire.

[0043] like Figure 3 As shown, the positioning ring 4 has a plurality of stop screw holes 402, which are evenly distributed on the positioning ring 4. In one specific embodiment, there are 18 stop screw holes 402, which are evenly distributed on the positioning ring 4. The arrangement of multiple stop screw holes 402 facilitates subsequent adjustment of the positioning ring 4.

[0044] In one specific embodiment, the positioning ring 4 is made of 316L stainless steel to improve its resistance to corrosion in marine environments.

[0045] In one specific embodiment, the width of the annular groove 101 is 80 mm and the depth is 15 mm.

[0046] In one specific embodiment, the outer ring 301 is made of 316L stainless steel to improve its resistance to corrosion in marine environments.

[0047] In one specific embodiment, the inner wall of the annular groove 101 is provided with a plurality of threaded holes for engaging with the arc segment 401. The threaded holes do not penetrate the outer tube 1, so that the outer tube 1 maintains sufficient strength.

[0048] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present utility model, and these all fall within the protection scope of the present utility model.

Claims

1. An adjustable replacement device for reducing the vibration of a rotating equipment in a marine environment, comprising: The assembly includes an outer tube (1), a main shaft (2), and a bearing bracket (3). The outer tube (1) is coaxially arranged with the main shaft (2), and the bearing bracket (3) is sleeved on the outside of the main shaft (2). The outer tube (1) has an annular groove (101) at a position corresponding to the bearing bracket (3). A positioning ring (4) is detachably arranged in the annular groove (101). An outer ring (301) is arranged on the outer edge of the bearing bracket (3), and the outer ring (301) cooperates with the positioning ring (4).

2. An adjustable replacement device for reducing the vibrations of rotating equipment in a marine environment according to claim 1, characterized in that, The positioning ring (4) includes four identical arc segments (401). The arc segments (401) are threaded to the inner wall of the annular groove (101) by screws. Both ends of the arc segments (401) are reserved for welding bevels for welding connection with adjacent arc segments (401).

3. An adjustable replacement device for reducing the vibrations of rotating equipment in a marine environment according to claim 1, wherein, The positioning ring (4) has a plurality of holes (402) for locking screws, which are evenly distributed on the positioning ring (4).

4. An adjustable replacement device for reducing the vibrations of rotating equipment in a marine environment according to claim 1, wherein, The positioning ring (4) is made of 316L stainless steel.

5. An adjustable replacement device for reducing the vibrations of rotating equipment in a marine environment according to claim 1, wherein, The annular groove (101) has a width of 80 mm and a depth of 15 mm.

6. An adjustable replacement device for reducing the vibrations of rotating equipment in a marine environment according to claim 1, wherein, The outer ring (301) is made of 316L stainless steel.

7. An adjustable replacement device for reducing the vibrations of rotating equipment in a marine environment according to claim 2, wherein, The inner wall of the annular groove (101) is provided with a plurality of threaded holes for cooperating with the arc segment (401), and the threaded holes do not penetrate the outer pipe (1).

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