A cavitation prevention device for desulfurization pumps

Abstract

This utility model discloses an anti-cavitation device for a desulfurization pump. This utility model relates to the field of desulfurization pump technology. The anti-cavitation device includes: a pump body; an anti-cavitation component fixedly connected to the outer wall of the pump body; a motor fixedly connected to the outer wall of the pump body; the anti-cavitation component includes an impeller baffle; a first impeller is fixedly connected to one side of the outer wall of the impeller baffle; and a second impeller is fixedly connected to the other side of the outer wall of the impeller baffle. Holes are formed in the walls of both the first and second impellers, and the holes are arranged in ascending order of size along the outer wall of the first impeller. This anti-cavitation device, through the linearly distributed holes of varying sizes on the impellers, can change the flow field characteristics inside and around the impellers, suppress bubble generation, appropriately reduce the centrifugal force during impeller rotation, make the pressure distribution at the impeller inlet more uniform, and reduce the occurrence of cavitation.

Description

Technical Field

[0001] This utility model relates to the field of desulfurization pump technology, specifically to an anti-cavitation device for desulfurization pumps. Background Technology

[0002] In industrial production processes such as thermal power generation and chemical smelting, flue gas desulfurization (FGD) is a crucial step in reducing sulfur dioxide emissions and environmental pollution. The desulfurization pump, as the core equipment of this process, is mainly used to transport highly corrosive slurries containing solid particles such as limestone and gypsum. These slurries are not only highly acidic but also characterized by high temperature and high solids content, placing extremely high demands on the performance and stability of the desulfurization pump.

[0003] When the impeller of a traditional desulfurization pump rotates at high speed, a sudden drop in local water pressure causes the liquid to vaporize and form bubbles. The impact force generated by the bursting of bubbles will continuously erode the impeller surface, causing the impeller to wear rapidly and its lifespan to be drastically reduced. At the same time, the turbulence and eddies formed after the liquid is thrown out will cause sudden changes in local pressure, exacerbating the cavitation phenomenon. Utility Model Content

[0004] To address the shortcomings of existing technologies, the technical solution adopted by this utility model is as follows: an anti-cavitation device for a desulfurization pump, comprising: a pump body, an anti-cavitation component fixedly connected to the outer wall of the pump body, a motor fixedly connected to the outer wall of the pump body, the anti-cavitation component including an impeller baffle, a first impeller fixedly connected to one side of the outer wall of the impeller baffle, and a second impeller fixedly connected to the other side of the outer wall of the impeller baffle, wherein holes are provided in the walls of both the first and second impellers, and the holes are arranged in ascending order along the outer wall of the first impeller, thereby reducing the probability of cavitation.

[0005] Preferably, the pump body includes a pump casing, with a spiral guide vane fixedly connected to the inner wall of the pump casing, an inlet pipe fixedly connected to the inner wall of the pump body, an outlet pipe fixedly connected to the inner wall of the pump body, and an output shaft rotatably connected to the inner wall of the pump body. The inner wall of the pump body has a spirally expanding shape, which allows the liquid to flow more smoothly inside the pump casing after being thrown out by the impeller. Compared with traditional pump casings, it can effectively avoid turbulence and eddies during liquid flow, reduce local pressure changes, and when the liquid flow is stable, the pressure will not drop below the saturated vapor pressure due to abnormal fluctuations, thereby further reducing the probability of cavitation.

[0006] Preferably, a filter screen is attached to the inner wall of the liquid inlet pipe. The filter screen is responsible for removing impurities in the liquid to protect the desulfurization pump.

[0007] Preferably, a flow stabilizer is attached to the inner wall of the outlet pipe, and the flow stabilizer is arranged in a ring array along the central axis of the outlet pipe. This can effectively regulate the turbulent liquid flow at the impeller outlet. The liquid discharged by the high-speed rotation of the impeller has a complex flow state, with many small eddies and uneven flow velocity areas. The flow stabilizer can block and guide the liquid, making the liquid flow direction and velocity more consistent, avoiding the formation of local low-pressure areas, and thus further reducing the probability of cavitation.

[0008] Preferably, the outer wall of the impeller partition is fixedly connected to the bottom of the output shaft, and the outer wall of the output shaft is fixedly connected to the output end of the motor. The operation of the entire desulfurization pump and the anti-cavitation device is realized by the motor.

[0009] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0010] 1. This utility model incorporates anti-cavitation components. Through holes set in the first and second impellers, the water flow is disrupted to prevent sudden drops in water pressure from generating bubbles. On the other hand, the small holes act as emergency air outlets, allowing air to escape when water pressure drops, preventing the formation of large bubbles that could rupture and damage the impellers. This protects the impellers from cavitation damage. The larger holes, while ensuring impeller strength, can appropriately reduce the centrifugal force during impeller rotation, resulting in a more uniform pressure distribution at the impeller inlet and reducing the tendency for cavitation.

[0011] 2. This utility model has a spiral guide vane fixedly connected to the inner wall of the pump body. The inner wall of the pump body has a spirally expanding shape, which allows the liquid to flow more smoothly in the pump casing after being thrown out from the impeller. Compared with traditional pump casings, it can avoid turbulence and eddies during liquid flow, reduce local pressure changes, and when the liquid flow is stable, the pressure will not drop below the saturated vapor pressure due to abnormal fluctuations, thereby reducing the probability of cavitation.

[0012] 3. This utility model can effectively regulate the turbulent liquid flow at the impeller outlet by attaching a flow stabilizer plate to the side of the outlet pipe near the pump body. The liquid discharged by the high-speed rotation of the impeller has a complex flow state with many small eddies and uneven flow velocity areas. The flow stabilizer plate can block and guide the liquid, making the liquid flow direction and velocity more consistent, avoiding the formation of local low-pressure areas, thereby further reducing the probability of cavitation. At the same time, the stable liquid flow is also conducive to extending the service life and maintenance cycle of the pump. Attached Figure Description

[0013] Figure 1 This is a plan view of the entire utility model;

[0014] Figure 2 This is a schematic diagram of the overall structure of this utility model;

[0015] Figure 3This is a schematic diagram of the structure of the first impeller of this utility model;

[0016] Figure 4 This is a schematic diagram of the spiral guide vane of this utility model;

[0017] Figure 5 This is a schematic diagram of the structure of the filter screen of this utility model;

[0018] Figure 6 This is a schematic diagram of the structure of the flow stabilizer plate of this utility model.

[0019] In the diagram: 1. Motor; 2. Pump body; 3. Anti-cavitation component; 21. Pump casing; 22. Spiral guide vane; 23. Inlet pipe; 24. Outlet pipe; 25. Output shaft; 31. Impeller baffle; 32. First impeller; 33. Second impeller; 34. Hole; 231. Filter screen; 241. Flow stabilizer. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Please see Figures 1 to 6 This utility model provides a technical solution: an anti-cavitation device for a desulfurization pump, comprising: a pump body 2, an anti-cavitation component 3 fixedly connected to the outer wall of the pump body 2, a motor 1 fixedly connected to the outer wall of the pump body 2, the anti-cavitation component 3 including an impeller baffle 31, a first impeller 32 fixedly connected to one side of the outer wall of the impeller baffle 31, and holes 34 being provided in the walls of both the first impeller 32 and the second impeller 33, and the holes 34 being arranged in ascending order along the outer wall of the first impeller 32. The small holes act as emergency air outlets, allowing air to escape when the water pressure drops, preventing the formation of large bubbles that could rupture and damage the first impeller 32 and the second impeller 33. This protects the first impeller 32 and the second impeller 33 from cavitation damage. The large holes can appropriately reduce the centrifugal force during rotation while ensuring the strength of the first impeller 32 and the second impeller 33, making the pressure distribution at the inlet more uniform and reducing the tendency of cavitation. In order to distinguish the first impeller 32 and the second impeller 33, only one row of holes 34 is opened on the first impeller 32. Opening too many holes 34 on the first impeller 32 is sometimes not a good choice, but will aggravate the cavitation phenomenon. In contrast, the second impeller 33 at the bottom does not have multiple rows of holes 34. On the contrary, the more holes 34 will reduce the occurrence of cavitation.

[0022] The pump body 2 includes a pump casing 21. A spiral guide vane 22 is fixedly connected to the inner wall of the pump casing 21. An inlet pipe 23 is fixedly connected to the inner wall of the pump body 2. An outlet pipe 24 is fixedly connected to the inner wall of the pump body 2. An output shaft 25 is rotatably connected to the inner wall of the pump body 2. The inner wall of the pump body 2 has a spirally expanding shape, so that the liquid can flow more smoothly in the pump casing 21 after being thrown out by the impeller.

[0023] A filter screen 231 is attached to the inner wall of the liquid inlet pipe 23. The filter screen 231 is responsible for removing impurities from the liquid to protect the desulfurization pump and the anti-cavitation device.

[0024] A flow stabilizer plate 241 is snapped into the inner wall of the outlet pipe 24, and the flow stabilizer plate 241 is arranged in a ring array along the central axis of the outlet pipe 24. It can effectively regulate the turbulent liquid flow at the impeller outlet. The liquid discharged by the high-speed rotating anti-cavitation component 3 has a complex flow state with many small eddies and uneven flow velocity areas. The flow stabilizer plate 241 can block and guide the liquid, making the liquid flow direction and velocity more consistent and avoiding the formation of local low-pressure areas.

[0025] The outer wall of the impeller partition 31 is fixedly connected to the bottom of the output shaft 25, and the outer wall of the output shaft 25 is fixedly connected to the output end of the motor 1. The operation of the entire desulfurization pump and the anti-cavitation device is realized through the motor's operation.

[0026] Working principle:

[0027] The desulfurization pump uses an anti-cavitation device. When the desulfurization pump is started, the motor 1 starts working, driving the output shaft 25 to rotate, which in turn drives the impeller partition 31, the first impeller 32, and the second impeller 33, which are fixedly connected to the output shaft 25, to rotate.

[0028] During the liquid transport process, the liquid flows in from the inlet pipe 23. The filter screen 231, which is snapped into the inner wall of the inlet pipe 23, first plays its role in intercepting impurities mixed in the liquid, preventing impurities from entering the pump body 2, and preventing impurities from causing wear and blockage to the internal components of the pump body 2, thereby protecting the normal operation of the internal structure of the pump body 2. Since the inlet pipe 23 is fixedly connected to the pump body 2 through a flange, when the filter screen 231 needs to be replaced, the inlet pipe 23 can be disassembled through the flange. Because the filter screen 231 is snapped into the inlet pipe 23, the filter screen 231 can be replaced more quickly.

[0029] After the filtered liquid enters the pump body 2, it is simultaneously drawn in from both sides by the cooperation of the impeller baffle 31, the first impeller 32, the second impeller 33, and the holes 34. Simultaneously, because the first impeller 32 and the second impeller 33 have linearly distributed holes of varying sizes, these holes significantly influence the liquid flow. The liquid already contains a considerable amount of dissolved air, similar to dissolved carbon dioxide in cola. During operation, the impellers rotate rapidly, forcefully throwing the liquid out. This process causes a sudden decrease in the liquid pressure, at which point the air in the liquid forms small bubbles. Once these bubbles burst, cavitation occurs. The small holes on the impellers allow this air in the liquid to pass through... Small holes are brushed out to prevent large air bubbles from accumulating around the impeller and bursting, causing cavitation. Larger holes, without compromising the impeller's strength, can slightly reduce the centrifugal force when the impeller rotates, resulting in a more even pressure distribution at the impeller inlet and reducing the likelihood of cavitation. Simply put, these holes of varying sizes on the impeller reduce cavitation by disrupting the water flow and releasing air. However, it should be noted that the first impeller 32 is closer to the pump body 2 than the second impeller 33. Therefore, only one row of holes 34 is made in the wall of the first impeller 32. Too many holes 34 not only fail to reduce cavitation but may also exacerbate it due to localized hydraulic pressure issues.

[0030] At this point, the spiral guide vanes 22 fixedly connected to the inner wall of the pump casing 21 begin to function. The spiral guide vanes 22 guide the liquid to flow along a specific spiral path. The spirally expanding inner wall of the pump casing 21 causes the liquid to gradually decelerate and increase in pressure during the flow process. The liquid can flow more smoothly within the pump casing 21, avoiding turbulence and eddies, reducing the occurrence of sudden local pressure changes, and further reducing the risk of the liquid pressure dropping below the saturated vapor pressure, thereby further reducing the possibility of cavitation.

[0031] Finally, the liquid ejected from the anti-cavitation component 3 and guided by the spiral guide vanes 22 enters the outlet pipe 24, which is fitted onto the inner wall of the pump casing 21. The flow stabilizing plate 241, which is attached to the inner wall of the outlet pipe 24, regulates the turbulent liquid flow discharged from the impeller outlet. Because the liquid discharged from the high-speed rotation of the impeller contains numerous small eddies and areas of uneven flow velocity, the flow stabilizing plate 241, by blocking and guiding the liquid, makes the direction and velocity of the liquid flow more consistent, eliminates local low-pressure areas, reduces the impact of the liquid on the outlet pipe wall and subsequent components, and ensures that the liquid is output from the outlet pipe in a stable state. Ultimately, with the cooperation of all components, the desulfurization pump achieves stable operation and reduces the probability of cavitation.

[0032] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A cavitation prevention device for a desulfurization pump, characterized in that, include: Pump body (2), the outer wall of the pump body (2) is fixedly connected to an anti-cavitation component (3), and the outer wall of the pump body (2) is fixedly connected to a motor (1); The anti-cavitation component (3) includes an impeller partition (31). A first impeller (32) is fixedly connected to one side of the outer wall of the impeller partition (31), and a second impeller (33) is fixedly connected to the other side of the outer wall of the impeller partition (31). Holes (34) are provided in the walls of both the first impeller (32) and the second impeller (33), and the holes (34) are arranged in order from small to large along the outer wall of the first impeller (32).

2. The anti-cavitation device for a desulfurization pump according to claim 1, characterized in that: The pump body (2) includes a pump casing (21), a spiral guide vane (22) is fixedly connected to the inner wall of the pump casing (21), an inlet pipe (23) is fixedly connected to the inner wall of the pump body (2), an outlet pipe (24) is fixedly connected to the inner wall of the pump body (2), and an output shaft (25) is rotatably connected to the inner wall of the pump body (2).

3. The anti-cavitation device for a desulfurization pump according to claim 2, characterized in that: A filter screen (231) is attached to the inner wall of the liquid inlet pipe (23).

4. The anti-cavitation device for a desulfurization pump according to claim 2, characterized in that: The inner wall of the outlet pipe (24) is fitted with a flow stabilizer plate (241), and the flow stabilizer plate (241) is arranged in a ring array along the central axis of the outlet pipe (24).

5. The anti-cavitation device for a desulfurization pump according to claim 2, characterized in that: The outer wall of the impeller partition (31) is fixedly connected to the bottom of the output shaft (25), and the outer wall of the output shaft (25) is fixedly connected to the output end of the motor (1).

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