Bionic water pump and combined biofilm formation inhibition method thereof

Abstract

The invention discloses a bionic water pump and a combined biofilm formation inhibition method thereof in the technical field of hydraulic engineering and municipal engineering, a plurality of bionic shark fins are arranged on the surface of a water guide cone of a pump device at intervals, each bionic shark fin comprises a bottom surface connected with the water guide cone, and a bionic shark fin water inlet edge and a bionic shark fin water outlet edge are arranged in the downstream direction; the surfaces of the blades and the guide blades are respectively provided with a placoid scale structure along the flow line direction of water flow, each placoid scale structure comprises a pair of auxiliary teeth which are symmetrically arranged, main teeth are arranged between the auxiliary teeth, and the main teeth and the auxiliary teeth are fixed on the surfaces of the blades and the guide blades through bases. A biological membrane on the inner surface of the pump is effectively removed through the scouring structure on the surface of the bionic water pump, adhesion is not prone to occurring, the anti-fouling capacity of the water pump in a fresh water body is improved, and safe and efficient operation of the water pump is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of water conservancy engineering and municipal engineering, and in particular to a bionic water pump and a combined method for inhibiting biofilm formation thereof. Background Art

[0002] As an important mechanical equipment, water pumps have a wide range of applications, covering many fields such as industry, agriculture, and urban infrastructure, and play an important role in promoting social progress and development. With the acceleration of economic development and modernization, the demand for more efficient, stable, and environmentally friendly water pumps in various fields is increasing. However, since water pumps need to operate underwater for a long time, microorganisms in natural water settle and adhere to various places on the inner surface of the pump. Once the microorganisms successfully adhere and begin to reproduce, it is very easy to form a biofilm, which will accelerate the corrosion of the water pump and may cause secondary pollution of the water body; in addition, the biofilm is also difficult to remove. Once attached to the impeller blades, it will increase the thickness of the blades and reduce the tip clearance, resulting in increased interference with the flow of water inside the water pump, aggravated cavitation, reduced efficiency, increased vibration and noise of the water pump, and in severe cases, it will cause the water pump unit to shut down, seriously damaging the economic performance and hydraulic performance of the water pump.

[0003] At present, there are related treatment technologies for biofilms generated by long-term operation of water pumps. Most of them use special coatings to treat the surface of objects running in the ocean for anti-fouling. The Chinese Patent Database has published a seawater pump that is resistant to marine biocorrosion, publication number: CN 102852846 A, publication date: January 2, 2013. The device sets an anti-marine biocorrosion protective layer on the surface of the parts of the seawater pump that are in direct contact with seawater, so that the pump has a good ability to prevent corrosion after marine biofilm adhesion, and long-term operation has no obvious effect on the coating; however, this technology only performs coating treatment on seawater pumps, and does not involve the treatment of biofilms on the surface of water pumps in freshwater areas. In addition, in the two-year test of this technology, aquatic organisms attached to the surface of both the full immersion and tidal range areas, indicating that the effect of coating treatment is not significant.

[0004] The Chinese patent database also published an anti-fouling coating and a method for preventing marine fouling organisms from fouling underwater objects, publication number: CN 105368115 A, publication date: March 2, 2016. The method applies an effective amount of compound to the surface of underwater objects, thereby preventing or reducing marine fouling organisms from attaching to and / or fouling the surface, achieving a low-toxic, high-efficiency, and environmentally friendly anti-fouling effect. The disadvantage of this method is that it is also aimed at the underwater surface of marine ships, and has no obvious effect on the treatment of biofilm on the surface of water pumps in freshwater areas. Summary of the invention

[0005] The purpose of the present invention is to overcome the defects in the prior art and provide a bionic water pump and a combined method for inhibiting biofilm formation. The biofilm on the inner surface of the pump can be effectively removed through the flushing structure on the surface of the bionic water pump, and it is not easy to adhere, thereby improving the anti-fouling ability of the water pump in fresh water bodies and ensuring the safe and efficient operation of the water pump.

[0006] The objective of the present invention is achieved as follows: a bionic water pump comprises a water guide cone, blades and guide vanes installed in the water pump, a plurality of bionic shark fins are arranged at intervals on the surface of the water guide cone, the bionic shark fin comprises a bottom surface connected to the water guide cone, and a bionic shark fin water inlet edge and a bionic shark fin water outlet edge are arranged in the direction of the water flow; the surfaces of the blades and guide vanes are respectively provided with shield scale structures along the direction of the water flow streamline, the shield scale structure comprises a pair of symmetrically arranged auxiliary teeth, main teeth are arranged between the auxiliary teeth, and the main teeth and auxiliary teeth are fixed to the surfaces of the blades and guide vanes through a base.

[0007] When the bionic water pump of the present invention is working, water enters the pump through the water guide cone. At this time, the bionic shark fin on the water guide cone produces a preliminary diversion effect on the water flow, so that the water flow is dispersed and evenly impacts the blade surface, and the blade surface is flushed for the first time; after the water flow enters the impeller, the water flow is accelerated, and at the same time, the shield scale structure on the blade surface once again diverts the water flow, so that each stream of water flowing through here is dispersed to its inner and outer sides at a faster speed, and more and more kinetic energy impacts are generated on the blade surface, completing the second flushing; after the high-speed water flow enters the guide vane body, the shield scale structure on the guide vane surface will cause the water flow to impact various parts of the guide vane surface, flushing the guide vane surface, and after the impact occurs, the kinetic energy of the water flow is reduced, and the flow rate is slowed down, so that the water flow enters the outlet flow channel more smoothly, improves the safety of the pump station, and reduces the pressure on the outer edge of the guide vane body.

[0008] Furthermore, four bionic shark fins are evenly arranged at 90° intervals along the circumferential surface of the water guide cone, the length of the bionic shark fin is 0.35 times the length of the water guide cone, the width of the bionic shark fin is 0.1 times the bottom radius of the water guide cone, and the height of the bionic shark fin is 0.2 times the bottom radius of the water guide cone.

[0009] Furthermore, a blade outlet edge and a blade inlet edge are respectively arranged on the left and right sides of the blade, the blade angle line between the center line of the blade axial surface and the blade angle line on both sides is 0~40°, the position of the shield scale structure is determined by the intersection between the blade axial surface section and the blade angle line, and the size of the shield scale structure increases by 10% each level from the hub to the rim.

[0010] Furthermore, a guide vane outlet edge and a guide vane inlet edge are respectively arranged on the upper and lower sides of the guide vane, the streamline flowing from the guide vane inlet edge to the guide vane outlet edge is the guide vane streamline direction bone line, the guide vane horizontal direction bone line intersecting with the guide vane streamline direction bone line between the guide vane outlet edge and the guide vane inlet edge is the guide vane horizontal direction bone line, and the position of the shield scale structure is determined by the intersection of the guide vane streamline direction bone line and the guide vane horizontal direction bone line.

[0011] A bionic water pump combined method for inhibiting biofilm formation, specifically: when the water pump is running under the designed working condition, the blades rotate at a high speed, and the water flow enters the water pump from the water guide cone under the suction force, first passes through the bionic shark fin on the surface of the water guide cone, and the bionic shark fin diverts the water flow for the first time, and then flows into the blades, the water flow is accelerated and diverted for the second time when passing through the shield scale structure on the blade, flushes the surface of the blade, and then flows into the guide vane, and is diverted for the third time after passing through the shield scale structure on the guide vane, and the water flow is dispersed to various places on the surface of the guide vane and flushes the surface of the guide vane, and finally flows out of the water pump; When the water pump is running under non-design conditions, the blades rotate at high speed and water is sucked into the water pump, but the water flow streamline is not smooth. When passing through the bionic shark fins on the surface of the water guide cone and the shield scale structure on the surface of the blades and guide vanes, the water flow is rectified, allowing the water to flow out of the water pump smoothly.

[0012] Compared with the prior art, the present invention has the following beneficial effects: First, the bionic pump of the present invention arranges bionic shark fins on the surface of the water guide cone and multiple shield scale structures on the surfaces of the blades and guide vanes, which produces a significant diversion effect on the water flowing through the pump. At the same time, the dispersed water flow is accelerated by the blades on the impeller, obtains more kinetic energy, and impacts the blades and guide vanes from different directions, finally flushing the biofilm on the inner surface of the pump.

[0013] Second, the overall shield scale structure is pointed and narrow, which can effectively reduce the resistance to water flow and has excellent flow capacity, so that the water flow is rectified while flushing the biofilm on the pump surface, thereby improving the stability of the pump operation; under non-design conditions, it has a rectifying effect on the water flow entering the pump, which can effectively clean the biofilm caused by long-term shutdown and long-term underwater operation, thereby improving the operating efficiency of the pump device.

[0014] Third, in a water pump with a water temperature of 25°C and a flow rate of >1m / s, the biomimetic pump of the present invention can remove the biofilm on the surface of the flow-through parts in about 5-18 days, depending on the type of microorganisms in the water and the water temperature. When the water temperature is low (5°C), the activity of the microorganisms themselves is suppressed, and their ability to attach and split is reduced. At the same time, the viscosity of the water increases, making the impact of the water flow relatively stronger, which is conducive to removing the biofilm. At this time, it takes about 5-7 days; when the water temperature is high (25°C), the microorganisms are more active, and their ability to attach and split is stronger, so it takes more time to remove, and it takes about 14-18 days. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the bionic water pump of the present invention.

[0016] Figure 2 It is a schematic structural diagram of the blade working surface of the bionic water pump of the present invention.

[0017] Figure 3 It is a structural schematic diagram of the guide vane working surface of the bionic water pump of the present invention.

[0018] Figure 4 It is a top view schematic diagram of the bionic shark skin shield scale structure of the bionic water pump of the present invention.

[0019] Figure 5 It is a side view schematic diagram of the bionic shark skin shield scale structure of the bionic water pump of the present invention.

[0020] Figure 6 It is a front view schematic diagram of the bionic shark skin shield scale structure of the bionic water pump of the present invention.

[0021] Figure 7 It is a schematic structural diagram of the bionic shark fin on the surface of the water guide cone of the bionic water pump of the present invention.

[0022] Figure 8 It is a schematic side view of the bionic shark fin on the surface of the water guide cone of the bionic water pump of the present invention.

[0023] Fig. 9 It is a top view schematic diagram of the bionic shark fin on the surface of the water guide cone of the bionic water pump of the present invention.

[0024] Fig.10 It is a front view schematic diagram of the bionic shark fin on the surface of the water guide cone of the bionic water pump of the present invention.

[0025] Among them, 1 is a water guide cone, 101 is the bottom surface of the water guide cone; 2 is a blade, 201 is the water inlet edge of the blade, 202 is the water outlet edge of the blade; 3 is a guide vane, 301 is the water inlet edge of the guide vane, 302 is the water outlet edge of the guide vane; 4 is a bionic shark fin, 401 is the water inlet edge of the bionic shark fin, 402 is the water outlet edge of the bionic shark fin, 403 is the bottom surface; 5 is a shield scale structure, 501 is the auxiliary tooth, 502 is the main tooth, 503 is the base; 6 is the center line of the blade axial surface, 7 is the blade angle line, 8 is the guide vane streamline direction bone line, 9 is the guide vane horizontal direction bone line, 10 is the blade axial surface section line. DETAILED DESCRIPTION

[0026] like Figures 1 to 10A bionic water pump shown in the figure comprises a water guide cone 1, blades 2 and guide vanes 3 installed in the water pump. A plurality of bionic shark fins 4 are arranged at intervals on the surface of the water guide cone 1. The bionic shark fin 4 comprises a bottom surface 403 connected to the water guide cone 1, and a bionic shark fin water inlet edge 401 and a bionic shark fin water outlet edge 402 are arranged in the direction of the water flow; the surfaces of the blades 2 and the guide vanes 3 are respectively provided with shield scale structures 5 along the streamline direction of the water flow, and the shield scale structures 5 comprise a pair of symmetrically arranged auxiliary teeth 501, and main teeth 502 are arranged between the auxiliary teeth 501, and the main teeth 501 and the auxiliary teeth 502 are fixed to the surfaces of the blades 2 and the guide vanes 3 through a base 503.

[0027] like Figure 2 As shown, a blade outlet edge 202 and a blade inlet edge 201 are respectively provided on the left and right sides of the blade 2, the blade axial center line 6 and the blade angle lines 7 on both sides are 0-40°, and the position of the shield scale structure 5 is determined by the intersection between the blade axial section line 10 and the blade angle line 7; since the contact surface between the blade 2 near the hub and the water flow is small, the size of the shield scale structure 5 increases by 10% each level from the lower blade axial section line 10 to the upper blade axial section line 10.

[0028] like Figure 3 As shown, a guide vane outlet edge 302 and a guide vane inlet edge 301 are respectively arranged on the upper and lower sides of the guide vane 3, the streamline flowing from the guide vane inlet edge 301 to the guide vane outlet edge 302 is the guide vane streamline direction bone line 8, the guide vane horizontal direction bone line 9 intersecting with the guide vane streamline direction bone line 8 between the guide vane outlet edge 302 and the guide vane inlet edge 301, and the position of the shield scale structure 5 is determined by the intersection of the guide vane streamline direction bone line 8 and the guide vane horizontal direction bone line 9.

[0029] like Figures 4 to 6 As shown, taking the shield scale structure 5 installed on the IV-axis section of the blade 2 as an example, its length is 0.05 times the radius of the blade 2, its width is 0.026 times the radius of the blade 2, and its height is 0.013 times the radius of the blade 2.

[0030] like Figures 7-10 As shown, four bionic shark fins 4 are evenly arranged at 90° intervals along the circumferential direction of the water guide cone 1, the length of the bionic shark fin 4 on the IV-axis section is 0.35 times the length of the water guide cone, the width of the bionic shark fin 4 is 0.1 times the radius of the bottom surface 101 of the water guide cone, and the height of the bionic shark fin 4 is 0.2 times the radius of the bottom surface 101 of the water guide cone.

[0031] A bionic water pump combined method for inhibiting biofilm formation, specifically: when the water pump is running under the designed working condition, the blade 2 rotates at a high speed, and the water flow enters the water pump from the water guide cone 1 under the suction force, first passes through the bionic shark fin 4 on the surface of the water guide cone 1, and the water flow flows in a streamlined manner from the bionic shark fin water inlet edge 401 to the bionic shark fin water outlet edge 402, the bionic shark fin 4 performs the first diversion of the water flow, and then flows into the blade 2, the water flow is accelerated by the rotation of the blade 2, and passes through the shield scale structure 5 on the blade 2. When the water flow is discharged, a pile of auxiliary teeth 502 on the base 503 and the main teeth 501 perform a second diversion of the water flow, flush the surface of the blade 2, and then flow into the guide vane 3, and then flow through the shield scale structure 5 on the guide vane 3 for the third time. The water flow is dispersed to various places on the surface of the guide vane 3 and flushes the surface of the guide vane 3, and finally flows out of the water pump; the shield scale structure 5 is sharp and narrow as a whole, which effectively reduces the resistance of the water flow and has excellent flow capacity, so that the water flow is rectified while flushing the surface biofilm, thereby improving the stability of the pump body operation; When the water pump is running under non-design conditions, the blades 2 rotate at high speed and water is sucked into the water pump, but the water flow streamline is not smooth. When the water flow passes through the bionic shark fin 4 on the surface of the water guide cone 1 and the shield scale structure 5 on the surface of the blades 2 and guide vanes 3, the water flow is rectified, so that the water flow flows out of the water pump smoothly.

[0032] When the bionic water pump of the present invention is working, water enters the pump through the water guide cone 1. At this time, the bionic shark fin 4 on the water guide cone 1 produces a preliminary diversion effect on the water flow, so that the water flow is dispersed and evenly impacts the surface of the blade 2, and the surface of the blade 2 is flushed for the first time; after the water flow enters the impeller, the water flow is accelerated. At the same time, the shield scale structure 5 on the surface of the blade 2 once again diverts the water flow, so that each stream of water flowing through here is dispersed to its inner and outer sides at a faster speed, and the surface of the blade 2 is impacted with more directions and greater kinetic energy, completing the second flushing; after the high-speed water flow enters the guide vane 3, the shield scale structure 5 on the surface of the guide vane 3 causes the water flow to impact various parts of the surface of the guide vane 3, flushing the surface of the guide vane 3, and after the impact occurs, the kinetic energy of the water flow is reduced, and the flow rate is slowed down, so that the water flow enters the outlet flow channel more smoothly, improves the safety of the pump station, and reduces the pressure on the outer edge of the guide vane 3.

[0033] The surface of the flow-through parts of the water pump will form a biofilm up to 800 μm thick in fresh water with a water temperature of 25°C and microbial populations mainly composed of encapsulated bacteria, fungi and algae cells. After about 5-18 days of operation, there is almost no biofilm on the surface of the flow-through parts of the biomimetic pump of the present invention, and a small amount of residual biofilm has a thickness of 10 μm or less, which effectively inhibits the formation of biofilm.

[0034] When the water flow velocity in the flow component of the bionic pump of the present invention exceeds 1 m / s, the requirement of quickly removing the biofilm can be met.

[0035] The bionic pump of the present invention has a bionic shark fin 4 arranged on the surface of the water guide cone 1, and a plurality of shield scale structures 5 arranged on the surfaces of the blades 2 and the guide vanes 3, so as to produce an obvious diversion effect on the water flowing through the pump. At the same time, the dispersed water flow is accelerated by the blades 2 on the impeller, obtains more kinetic energy, and impacts the blades 2 and the guide vanes 3 from different directions, and finally flushes the biofilm on the inner surface of the pump; the shield scale structure 5 is sharp and narrow as a whole, which can effectively reduce the resistance to the water flow and has excellent flow capacity, so that the water flow is rectified while flushing the surface biofilm, thereby improving the stability of the pump body operation; under non-design working conditions, it has a rectifying effect on the water flow entering the pump, and can effectively clean the biofilm generated by long-term shutdown and long-term underwater operation, thereby improving the operation efficiency of the pump device; in a water pump with a water temperature of 25°C and a flow rate of more than 1m / s, according to the types of microorganisms in the water and the water temperature, the biofilm on the surface of the flow-through component of the bionic pump of the present invention can be removed in about 5-18 days. When the water temperature is low (5°C), the activity of the microorganisms themselves is inhibited, and their ability to attach and divide is reduced. At the same time, the viscosity of the water increases, making the impact of the water flow relatively stronger, which is conducive to the removal of biofilms. At this time, it takes about 5-7 days; when the water temperature is high (25°C), the microorganisms are more active, and their ability to attach and divide is stronger, so it takes more time to remove them. At this time, it takes about 14-18 days.

[0036] The present invention is not limited to the above-mentioned embodiments. On the basis of the technical solution disclosed in the present invention, technicians in this field can make some substitutions and deformations to some technical features therein according to the disclosed technical content without creative labor, and these substitutions and deformations are all within the protection scope of the present invention.

Claims

1. A bionic water pump, comprising a water guide cone, blades and guide vanes installed in the water pump, characterized in that: The surface of the water guide cone is provided with a plurality of bionic shark fins at intervals, the bionic shark fins include a bottom surface connected to the water guide cone, and a bionic shark fin water inlet edge and a bionic shark fin water outlet edge are provided in the direction of the water flow; the surfaces of the blades and guide vanes are respectively provided with shield scale structures along the direction of the water flow streamline, the shield scale structure includes a pair of symmetrically arranged auxiliary teeth, main teeth are provided between the auxiliary teeth, and the main teeth and the auxiliary teeth are fixed to the surfaces of the blades and guide vanes through a base.

2. A bionic water pump according to claim 1, characterized in that: The bionic shark fins are evenly arranged at 90° intervals along the circumferential surface of the water guide cone, the length of the bionic shark fin is 0.35 times the length of the water guide cone, the width of the bionic shark fin is 0.1 times the bottom radius of the water guide cone, and the height of the bionic shark fin is 0.2 times the bottom radius of the water guide cone.

3. A bionic water pump according to claim 1, characterized in that: The blade outlet edge and the blade inlet edge are respectively arranged on the left and right sides of the blade, the blade angle line between the center line of the blade axial surface and the blade angle line on both sides is 0~40°, the position of the shield scale structure is determined by the intersection between the blade axial surface section and the blade angle line, and the size of the shield scale structure increases by 10% each level from the lower hub of the blade to the rim.

4. A bionic water pump according to claim 1, characterized in that: A guide vane outlet edge and a guide vane inlet edge are respectively arranged on the upper and lower sides of the guide vane, the streamline flowing from the guide vane inlet edge to the guide vane outlet edge is the guide vane streamline direction bone line, the guide vane horizontal direction bone line intersecting with the guide vane streamline direction bone line between the guide vane outlet edge and the guide vane inlet edge is the guide vane horizontal direction bone line, and the position of the shield scale structure is determined by the intersection of the guide vane streamline direction bone line and the guide vane horizontal direction bone line.

5. A biomimetic water pump combined method for inhibiting biofilm formation according to any one of items 1 to 4, characterized in that: When the water pump is running under the designed working condition, the blades rotate at high speed, and the water flow enters the water pump from the water guide cone under the suction force, first passes through the bionic shark fin on the surface of the water guide cone, and the bionic shark fin diverts the water flow for the first time, and then flows into the blades, the water flow is accelerated and diverted for the second time when passing through the shield scale structure on the blade, flushing the surface of the blade, and then flows into the guide vane, and is diverted for the third time through the shield scale structure on the guide vane. The water flow is dispersed to various places on the surface of the guide vane and flushes the surface of the guide vane, and finally flows out of the water pump; When the water pump is running under non-design conditions, the blades rotate at high speed and water is sucked into the water pump, but the water flow streamline is not smooth. When passing through the bionic shark fins on the surface of the water guide cone and the shield scale structure on the surface of the blades and guide vanes, the water flow is rectified, allowing the water to flow out of the water pump smoothly.

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