A device for intercepting and pumping blockages in open channels

Abstract

The application provides a device for intercepting and pumping blockage of open channel, comprising an intercepting module, a pumping device and a centrifugal pump, the intercepting module is located in the open channel, the outlet of the intercepting module is connected with the centrifugal pump through the pumping device; the intercepting module comprises a net basket which changes with the liquid level, for intercepting impurities entering the centrifugal pump; at least one discontinuous inflection point is arranged in the flow channel of the pumping device, for forming a vortex or turbulent flow area. The application can reduce the damage and death of fish, shrimps and the like while meeting the operation, and clean the blockage of water surface sundries, so as to improve the survival rate of marine organisms, freshwater organisms and the like flowing through the pumping station and the cleaning efficiency of water surface floating sundries.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of open channel water pump, in particular to a device for intercepting and pumping blockages for open channel. BACKGROUND

[0002] With the global warming, ocean environmental change and the influence of extreme environment, marine organisms and freshwater organisms outbreak has become the norm. To some extent, it has destroyed the marine and river ecological environment. A large number of marine organisms and freshwater organisms are easy to enter the nuclear power plant and the pumping station through the water intake tunnel, which threatens the normal operation of the unit, and the artificial cleaning is time-consuming and laborious, which needs mechanization and scientific and precise salvage.

[0003] The high-speed rotating impeller of the traditional vane pump can cause unavoidable damage to fish or even death. This not only hinders fish migration and migration, affects population quantity and fish diversity, but also pollutes the local water area by the dead fish floating on the water surface, which is not conducive to fish protection and ecological system stability. Under the background of ecological friendliness and sustainable development, optimizing the structure of the overall device and components for intercepting and pumping blockages for open channel to reduce fish damage, death and cleaning purposes has become the focus of attention of government departments and manufacturers.

[0004] In many industrial and engineering fields, intercepting and pumping devices are commonly used for solid-liquid two-phase flow transmission, such as sewage treatment, mineral processing, marine organism transportation, etc. However, the flow characteristics of different particles in solid-liquid two-phase flow, such as size, density and shape, have certain complexity. Therefore, it is necessary to explore the mechanism and control method of solid-liquid two-phase flow transmission of different particle sizes and densities, and optimize the design based on this to solve the problem of efficient transportation of marine organisms and freshwater organisms. It has important theoretical significance and practical application value.

[0005] The research on fish-friendly centrifugal pumps in China is still in its infancy. For example, the patent technology with publication number CN103452912A does not consider the optimization of the pump body when live fish pass through. In order to alleviate the damage and death of fish, the patent technology with publication number CN104613001A designs the impeller and the inlet edge of the guide vane to alleviate the damage of fish, but it cannot prevent fish from entering the blade tip gap, and it is difficult to effectively improve the survival rate of fish. In addition, for fish-friendly axial flow pumps and tubular pumps, the patent technologies with publication numbers CN115076123B, CN104613001A, 105626573A and CN117552997A mainly improve the structure of the flow parts such as the impeller to reduce the damage to fish, but in the design of the flow passage, it does not have the design of the spiral centrifugal pump for fish and large-sized sundries, and it is relatively more prone to blockage. The fish-friendly axial flow pump generally guides the fish to pass through the hub shaft of the impeller and the guide vane by setting a conical-shaped mesh, but it is still difficult to prevent the fish from colliding with the internal parts of the pump. The fish-friendly tubular pump relies on the optimization of the hydraulic model to reduce damage, but it is difficult to achieve soft transportation like the spiral centrifugal pump without touching the pump parts. The fish-friendly axial flow pump is mainly suitable for low-lift and large-flow occasions such as irrigation, drainage and dock drainage. The fish-friendly tubular pump is mainly used in large-flow water diversion projects. The spiral centrifugal pump is more versatile. SUMMARY

[0006] In view of the deficiencies in the prior art, the present application provides a device for blocking and pumping of blockages in open channels, which can reduce damage and death of fish, shrimp and other aquatic organisms while meeting operational requirements, and clean up surface debris to improve the survival rate of marine and freshwater organisms passing through the pump station and the efficiency of cleaning floating debris on the water surface. The present application focuses on the biological blockage and debris cleaning problems faced by nuclear power plants and pump station intake tunnels. The present application combines a mesh bag with inlet optimization and pump body optimization to reduce damage and death of fish, shrimp and other aquatic organisms, while preventing blockage by debris. On the basis of meeting the water pumping function, the protection of marine and freshwater organisms is improved, and the efficiency of debris treatment is enhanced. The present application realizes ecological friendliness and high efficiency during the operation of nuclear power plants, provides key support for the ecological development of nuclear power and water conservancy projects, and has great popularization prospects.

[0007] The present application achieves the above technical objectives through the following technical means.

[0008] The device for intercepting and pumping the blockage of open channel comprises an intercepting module, a pumping device and a centrifugal pump, the intercepting module is located in the open channel, the outlet of the intercepting module is connected with the centrifugal pump through the pumping device; the net bag changing with the liquid level is arranged in the intercepting module for intercepting the impurities entering the centrifugal pump; at least one discontinuous inflection point is arranged in the flow channel of the pumping device for forming the vortex or turbulence area.

[0009] Further, the net bag in the intercepting module is tapered, the small end of the tapered shape is connected with the pumping device, the small end of the tapered shape is the outlet of the net bag, and the large end of the tapered shape is the inlet of the net bag; the float is arranged above the net bag for suspending the net bag on the liquid surface.

[0010] Further, the inlet diameter of the net bag is defined as L1, the outlet diameter L2 of the net bag ranges from 0.5L1 to L1, the upper side length L3 of the net bag ranges from L1 to 1.2L1, the lower side length L4 of the net bag ranges from L1 to 1.2L1, and the tapering angle θ1 of the net bag ranges from 30° to 45°, so that the tapered inlet and outlet diameter can avoid the complete blockage of the net bag caused by the water level fluctuation and the accumulation of the water surface impurities carried by the water flow, and facilitate the collection and improve the efficiency when there are more water surface impurities.

[0011] Further, the pumping device comprises a front section, a middle section and a tail section of the water inlet pipe connected in sequence according to the flow direction; the front section of the water inlet pipe is connected with the intercepting module; the inflection point is arranged at the joint of the front section of the water inlet pipe and the middle section of the water inlet pipe, and the tail section of the water inlet pipe is connected with the inlet of the centrifugal pump; the tail section of the water inlet pipe is parallel to the water surface; and the middle section of the water inlet pipe is an arc-shaped pipeline. The inflection point is arranged at the joint of the front section of the water inlet pipe and the middle section of the water inlet pipe instead of the smooth curve, which can change the water flow direction, form a specific flow path in the pipeline, better realize the collection and transportation of the substances in the water flow, form the vortex or turbulence area at the inflection point of the pipeline, increase the contact and entrapment of the water flow with the water surface impurities, marine organisms and the like, make more impurities be rolled into the water flow and be brought into the pumping device, improve the efficiency, and be beneficial to the structural stability, increase some support points or turning points, enhance the overall rigidity of the pipeline, prevent the pipeline from being bent or twisted greatly due to the water flow impact, external load and other factors, and ensure the normal operation of the pumping device.

[0012] Further, the angle θ2 formed between the upper side of the front section of the water inlet pipe and the water surface is in the range of 30°≤θ2≤45°, which sends the collected fish, shrimp, water surface debris, etc. into the suction device and the subsequent pump body to play a certain thrust effect, thereby improving the efficiency of the collection of marine organisms, freshwater organisms, and water surface debris. The collected fish, shrimp, water surface debris, etc. are sent into the suction device and the subsequent pump body to play a certain thrust effect, thereby improving the efficiency of the collection of marine organisms, freshwater organisms, and water surface debris.

[0013] Further, the centrifugal pump is a fish-friendly helical centrifugal pump, the impeller blade diameter D1 of the centrifugal pump is in the range of 0.5L1≤D1≤0.6L1, the impeller blade length L8 of the centrifugal pump is in the range of 0.25L1≤L8≤0.4L1, and the impeller width D2 of the centrifugal pump is in the range of 0.8L1≤D2≤L1, which avoids mutual extrusion between fish and thus reduces damage.

[0014] Further, the suction section inlet diameter D3 of the centrifugal pump is in the range of 0.25L1≤D3≤0.4L1, and the outlet section outlet diameter D4 of the centrifugal pump is in the range of 0.25L1≤D4≤0.4L1, which prevents fish, shrimp, water surface debris, etc. from being blocked at the inlet, and the debris and fish flow out from the volute after passing through the helical impeller.

[0015] Further, in order to protect the organisms and reduce the risk of water flow impact, the inlet angle and the outlet angle θ4 of the centrifugal pump are both in the range of 10°≤θ4≤30°, which makes the transition of fluid entering and leaving the pump body more smooth, effectively inhibiting the local pressure loss and vortex phenomenon caused by unreasonable inlet and outlet intersection angle. From the perspective of ecological protection, the stable water flow state can avoid the damage to organisms caused by high-speed water flow impact, especially when fish, shrimp and other organisms are close to the pump inlet and outlet area, reducing the possibility of being trapped or injured due to sudden water flow. At the same time, the optimized inlet and outlet intersection angle helps to improve the hydraulic efficiency of the pump, reduce energy consumption and meet the energy saving demand, which is of great significance to long-term running facilities such as nuclear power plants and pumping stations; the slope of the impeller hub of the centrifugal pump gradually changes from the impeller inlet to the impeller outlet, the slope K1 of the impeller hub inlet is in the range of 0.05≤K1≤0.1, and the slope K2 of the impeller hub outlet is in the range of 0.15≤K1≤0.2; this gradually changing hub slope design fully considers the damage to organisms, optimizes the organism guiding path, and also considers certain hydraulic performance. Through special slope gradient, the water flow and the movement of organisms are gently guided, and the generation of turbulence is reduced. It not only meets the strict requirements of organism protection in the water intake scene of nuclear power plants and pumping stations, but also ensures the stable operation of the pump, which is in sharp contrast to the general hub slope design of centrifugal pumps, and better adapts to complex and diverse actual working conditions.

[0016] In the radial direction from the impeller inlet to the outlet, the impeller rim slope of the centrifugal pump gradually changes, the slope K3 of the impeller rim inlet in the radial direction is in the range of 0.02≤K3≤0.05, and the slope K4 of the impeller rim outlet in the radial direction is in the range of 0.06≤K4≤0.08. This slope change cooperates with the hub slope to optimize the flow field inside and around the impeller, which can not only efficiently guide the water flow to carry out the debris, but also effectively protect the organisms from being harmed. It is significantly different from the general spiral centrifugal pump rim design.

[0017] The beneficial effects of the present application are:

[0018] 1. The device for intercepting and pumping the blockage in the open channel according to the present application comprises an intercepting module, a pumping device and a fish-friendly spiral centrifugal pump, the water-facing surface of the intercepting module is fixed in the water by a support, the water flow enters the water-facing surface of the intercepting module and flows to the tail of the intercepting module, the intercepting module gradually forms a contraction shape, the area of the tail is the smallest, and the debris is guided to flow naturally to the tail and concentrated. The pumping device is connected to the tail of the intercepting module to pump and send the intercepted debris away. At least one non-continuous inflection point is arranged in the flow channel of the pumping device, which can form a vortex or turbulent flow area to increase the contact and entrapment of the water flow with the water surface debris, marine organisms and the like.

[0019] 2. The device for intercepting and pumping blockages in open channels according to the present application, the tapered inlet and outlet diameters and the installation of buoys above the net bag can effectively prevent the net bag from being completely blocked in the face of complex situations such as water level fluctuations and water flow carrying a large amount of debris. For example, during the rainy season or flood season, the water level rises sharply, the water flow is turbulent and the debris increases. If the net bag does not have a suitable reserved height, it is easy to be filled with debris in a short time, causing the water flow to be unable to pass normally, affecting the operation of the entire device. The design of the present application can ensure that the device can work continuously and stably under various water level and water flow conditions, has a certain degree of adaptability, and guarantees the continuity of water intake and water transportation.

[0020] 2. The device for intercepting and pumping blockages in open channels according to the present application, the front section of the inlet pipe is closely connected with the interception module and has a certain flow guide design to pump water flow and push debris into the pump body; the concave design of the middle section of the inlet pipe facilitates the flow of debris and fish and helps them enter the pump body; the tail section of the inlet pipe is parallel to the water surface to facilitate connection with the pump body, which optimizes the transportation process of fish, shrimp, water surface debris, etc., making it more efficient to enter the pump body.

[0021] 3. The device for intercepting and pumping blockages in open channels according to the present application, a non-continuous inflection point is provided at the joint between the front section and the middle section of the inlet pipe instead of a smooth curve. First, the existence of the inflection point can change the direction of the water flow, making the water flow form a specific flow path in the pipeline. This better realizes the collection and transportation of substances in the water flow. Second, the pipeline with an inflection point can form a certain vortex or turbulent area at the inflection point, which can increase the contact and entrapment of water flow with water surface debris, marine organisms, etc., so that more debris is rolled into the water flow and brought into the pumping device, improving efficiency. Finally, it is beneficial to structural stability, increases some support points or turning points, enhances the overall rigidity of the pipeline, and is not easy to bend or twist greatly due to water flow impact, external load and other factors, ensuring the normal operation of the pumping device.

[0022] 4. The device for intercepting and pumping blockages in open channels according to the present application, the centrifugal pump is a fish-friendly spiral centrifugal pump, the inlet edge of the blade of the impeller is swept forward in the direction of rotation of the impeller and extends axially to form a streamlined shape, effectively reducing damage and death to marine organisms and river organisms, improving the ecological friendliness of the pump, and achieving optimal protection of the aquatic environment while meeting the water transportation function and cleaning debris, which has important significance for maintaining ecological balance and promoting ecological development of nuclear power and water conservancy projects. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed in the description of the embodiments or the prior art. The drawings described in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0024] Figure 1 Structure diagram of the device for intercepting and pumping the blockage of open channel according to the present application.

[0025] Figure 2 Structure diagram of the intercepting module according to the present application.

[0026] Figure 3 Structure diagram of the pumping device according to the present application.

[0027] Figure 4 Structure diagram of the centrifugal pump according to the present application.

[0028] Figure 5 Structure diagram of the impeller according to the present application.

[0029] In the drawings:

[0030] 1-intercepting module; 1-1-sieve; 1-2-sieve fixing device; 1-3-buoy; 2-pumping device; 2-1-front section of water inlet pipe; 2-2-middle section of water inlet pipe; 2-3-tail section of water inlet pipe; 3-fish-friendly centrifugal pump; 3-1-impeller; 3-1-1-impeller hub; 3-1-2-impeller blade; 3-1-3-impeller rim; 3-1-4-inlet edge; 3-1-5-outlet edge; 3-1-6-blade leading edge; 3-1-7-blade trailing edge; 3-2-shaft; 3-3-space volute; 3-4-bracket; 3-5-pulley; 3-6-back plate; 3-7-long screw; 3-8-suction section; 3-9-fixed support; 3-10-outlet section; 4-motor. DETAILED DESCRIPTION

[0031] The embodiments of the present application will be described in detail below, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0032] In the description of the present application, it needs to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "axial", "radial", "vertical", "horizontal", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application. In addition, the terms "first", "second" are only for description purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly specified and limited.

[0033] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0034] As Figure 1 shown, the present application comprises an interception module 1, a suction device 2 and a centrifugal pump 3, the interception module 1 is located in the open channel, the outlet of the interception module 1 is connected with the centrifugal pump 3 through the suction device 2, specifically: the tail of the interception module 1 is in communication with the water inlet end of the suction device 2, the output end of the suction device 2 is connected with the suction section 3-8 of the centrifugal pump 3, the water flow passes through the suction device 2, and then flows from the suction section 3-8 of the centrifugal pump 3 to the pump body, and then flows out from the outlet section 3-10 of the centrifugal pump 3. The interception module 1 comprises a net bag 1-1 arranged to change with the liquid level, which is used to intercept impurities entering the centrifugal pump 3; at least one non-continuous inflection point is arranged in the flow channel of the suction device 2, which is used to form a vortex or turbulent flow area, which can increase the contact and entrapment of the water flow with water surface impurities, marine organisms and the like.

[0035] As Figure 2As shown in the drawings, the net 1-1 in the interception module 1 is tapered, the net 1-1 is fixed by the net fixing device 1-2, the small end of the taper is connected with the suction device 2, the small end of the taper is the outlet of the net 1-1, and the large end of the taper is the inlet of the net 1-1; a float 1-3 is installed above the net 1-1 to suspend the net 1-1 on the water surface. The inlet diameter of the net 1-1 is defined as L1; the outlet diameter L2 of the net 1-1 ranges from 0.5L1 to L1; the upper side length L3 of the net 1-1 ranges from L1 to 1.2L1; the taper angle θ1 (i.e. the angle between the lower side of the net 1-1 and the water surface) ranges from 30° to 45°; the lower side length L4 of the net 1-1 ranges from L1 to 1.2L1; the net 1-1 is fixed by the net fixing device 1-2 so that the water-facing surface is located in the water, the water flow enters from the water-facing surface and flows to the tail, and the interception module is tapered to concentrate the sundries at the tail. The float 1-3 can prevent the net from being completely blocked due to the fluctuation of water level and the accumulation of water surface sundries carried by the water flow, and facilitate the collection of water surface sundries when there are many water surface sundries, thereby improving the efficiency.

[0036] As shown in the drawings, Figure 3 The suction device 2 includes, in the flow direction, a water inlet pipe front section 2-1, a water inlet pipe middle section 2-2 and a water inlet pipe tail section 2-3 connected in sequence; the water inlet pipe front section 2-1 is connected with the interception module 1; a non-continuous inflection point is arranged at the joint of the water inlet pipe front section 2-1 and the water inlet pipe middle section 2-2; the water inlet pipe tail section 2-3 is connected with the suction section 3-8 of the centrifugal pump 3; the water inlet pipe tail section 2-3 is parallel to the water surface; and the water inlet pipe middle section 2-2 is an arc-shaped pipe.

[0037] The inner side of the upper side surface of the water inlet pipe front section 2-1 close to the water surface plays a role in connecting the interception module 1 and the suction device 2 and guiding the water flow; the angle θ2 between the upper side of the water inlet pipe front section 2-1 and the water surface ranges from 30° to 45°; the angle between the lower side of the water inlet pipe front section 2-1 and the water surface is greater than θ2; and the width L5 of the water inlet pipe front section 2-1 ranges from 0.25L1 to 0.5L1, which can send the collected fish, shrimps, water surface sundries and the like into the suction device 2 and the subsequent pump body to play a certain thrust effect, thereby improving the efficiency of the flow of marine organisms, freshwater organisms and the like and the collection of water surface sundries and the like. The width L7 of the water inlet pipe tail section 2-3 ranges from L5 to 2L5, which facilitates the connection of the water outlet of the water inlet pipe tail section 2-3 with the suction inlet of the centrifugal pump 3; the water inlet pipe middle section 2-2 is a circular arc pipe, the radius R1 of the circular arc pipe ranges from 5L7 to 5L7, and the length L6 of the circular arc pipe ranges from 0.5L1 to 1.5L1. The efficiency of the flow of marine organisms, freshwater organisms and the like and the collection of water surface sundries and the like is improved.

[0038] The non-continuous inflection point instead of smooth curve is arranged at the joint of the front section 2-1 and the middle section 2-2 of the water inlet pipe, firstly, the existence of the inflection point can change the direction of water flow, so that the water flow forms a specific flow path in the pipeline. Better to achieve the collection and transportation of substances in the water flow. Secondly, the pipeline with the inflection point can form a certain vortex or turbulent flow area at the inflection point. These areas can increase the contact and entrapment of water flow with water surface debris, marine organisms and the like, so that more debris is rolled into the water flow and brought into the suction device, improving the efficiency. Finally, it is beneficial to the stability of the structure, increases some support points or turning points, enhances the overall rigidity of the pipeline, and is not easy to be bent or twisted greatly due to water flow impact, external load and other factors, ensuring the normal operation of the suction device.

[0039] As shown in Figure 4 and Figure 5 The centrifugal pump 3 is a fish-friendly spiral centrifugal pump, which comprises an impeller 3-1, a shaft 3-2, a space volute 3-3, a support 3-4, a belt pulley 3-5, a back plate 3-6, a long screw 3-7, a suction section 3-8, a fixed base 3-9 and an outlet section 3-10. The impeller 3-1 is in transmission connection with the shaft 3-2, the impeller 3-1 is located in the space volute 3-3, one end of the shaft 3-2 is connected with the motor 4 through the belt pulley 3-5, and the support 3-4 is used for supporting the shell; the shell is provided with the space volute 3-3, the suction section 3-8 and the outlet section 3-10, and the shell, the support 3-4 and the motor 4 are installed on the fixed base 3-9.

[0040] The diameter D1 of the impeller blade 3-1-2 of the centrifugal pump 3 ranges from 0.5L1 to 0.6L1, the length L8 of the impeller blade 3-1-2 ranges from 0.25L1 to 0.4L1, and the width D2 of the impeller 3-1 ranges from 0.8L1 to L1, so as to avoid mutual extrusion between fishes and reduce damage.

[0041] In order to protect the organisms, reduce the water flow impact and maintain high-efficiency water transportation, the wrap angle θ3 of the impeller 3-1 of the centrifugal pump 3 ranges from 90° to 110°, which can ensure that the fluid obtains sufficient energy in the impeller, guarantee the water transportation efficiency of the pump, meet the water demand of nuclear power plants and pumping stations, and guide the water flow to pass through the impeller smoothly, reduce the water flow impact and disorder, and reduce the damage risk of the organisms such as fishes and shrimps caused by unstable water flow. The interval can better adapt to the dual requirements of organism-friendly and reliable operation in the water taking scene of nuclear power plants and pumping stations.

[0042] The suction section 3-8 of the centrifugal pump 3 has an inlet diameter D3 in the range of 0.25L1≤D3≤0.4L1, and the outlet section 3-10 of the centrifugal pump 3 has an outlet diameter D4 in the range of 0.25L1≤D4≤0.4L1, which prevents fish, shrimp, and water surface debris from being blocked at the inlet, and the debris and fish flow out of the volute after passing through the spiral impeller.

[0043] To protect the organisms and reduce the risk of water flow impact, while taking into account the high efficiency and energy saving, the inlet angle and the outlet angle θ4 of the centrifugal pump 3 are in the range of 10°≤θ4≤30°. Such a design makes the transition of the fluid entering and flowing out of the pump body smoother, effectively inhibiting the local pressure loss and vortex phenomenon caused by unreasonable inlet and outlet intersection angles. From the perspective of ecological protection, a stable water flow state can avoid the damage to organisms caused by high-speed water flow impact, especially when fish, shrimp and other organisms are close to the pump inlet and outlet area, reducing the possibility of being trapped or injured due to sudden changes in water flow. At the same time, the optimized inlet and outlet intersection angles help to improve the hydraulic efficiency of the pump, reduce energy consumption, and meet the energy saving demand, which is of great significance for long-term operation of nuclear power plants, pumping stations and other facilities.

[0044] The slope of the impeller hub 3-1-1 of the centrifugal pump 3 gradually changes from the impeller inlet to the impeller outlet, the slope K1 of the impeller hub 3-1-1 at the inlet is in the range of 0.05≤K1≤0.1, and the slope K2 of the impeller hub 3-1-1 at the outlet is in the range of 0.15≤K1≤0.2. This gradually changing hub slope design fully considers the damage to organisms, optimizes the organism guiding path, and takes into account certain hydraulic performance. Through special slope gradient, the water flow and organism movement are gently guided, reducing the generation of turbulence. It not only meets the strict requirements of organism protection in the water intake scene of nuclear power plants and pumping stations, but also ensures the stable operation of the pump, which is in sharp contrast to the general spiral centrifugal pump hub slope design, and better adapts to complex and diverse actual working conditions.

[0045] In the radial direction from the impeller inlet to the outlet, the slope of the impeller shroud 3-1-3 of the centrifugal pump 3 gradually changes, the slope K3 of the impeller shroud 3-1-3 at the inlet in the radial direction is in the range of 0.02≤K3≤0.05, and the slope K4 of the impeller shroud 3-1-3 at the outlet in the radial direction is in the range of 0.06≤K4≤0.08. In this way, the outer contour conforms to the natural flow path of the water flow, and under the premise of ensuring structural strength, the frictional resistance of the water flow and the shroud is minimized. This slope change cooperates with the hub slope to optimize the flow field inside and around the impeller, which can not only efficiently guide the water flow to carry out debris, but also effectively protect organisms from harm. This is significantly different from the general spiral centrifugal pump shroud design.

[0046] The centrifugal pump 3 comprises at least one blade, too many blades can increase the probability of blade hitting fish and increase the mortality rate of fish; too few blades cannot guarantee the flow state and reduce the efficiency of the pump.

[0047] The centrifugal pump 3 is connected to the motor 4 at the other end, and the motor 4 serves as a power source, and the output shaft of the motor is connected to the driving pulley 3-5. When the motor is started, the rotating motion is transmitted to the driving pulley through the shaft to make it rotate. The driving pulley drives the driven pulley to rotate through the belt by friction, and the shaft 3-2 of the pump is connected to the driven pulley. Finally, the rotating motion of the driven pulley is transmitted to the pump shaft 3-2, prompting the pump to start working. The diameter of the pulley can be designed as needed, and changing the diameter ratio of the driving and driven pulleys can adjust the pump speed. The driving pulley diameter is larger than the driven pulley diameter for speed-up transmission, and vice versa for speed reduction transmission. Reasonable matching can make the pump speed optimal, ensuring that the motor and pump work together.

[0048] Compared with the traditional spiral centrifugal pump, the present application innovatively modifies the water inlet flow channel and optimally designs the key parameters such as the blade angle, the inlet and outlet intersection angle, the hub slope, and the rim shape and slope. Through the net bag net, the inlet optimization pipeline, and the pump body optimization, the overall combination and innovation greatly improve the protection capability of marine organisms and freshwater organisms while meeting the water pumping function, and at the same time, the efficiency of handling sundries is enhanced. The present application provides a more reliable and eco-friendly pumping solution for nuclear power plants, pumping stations and other fields, and has important significance for maintaining ecological balance and promoting the ecological development of nuclear power and water conservancy projects.

[0049] It should be understood that although the present specification is described in terms of various embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be combined appropriately to form other embodiments that those skilled in the art can understand.

[0050] The above series of detailed descriptions are only specific descriptions of feasible embodiments of the present application, and are not intended to limit the protection scope of the present application. Any equivalent embodiments or changes made without departing from the spirit of the present application should be included in the protection scope of the present application.

Claims

1. A device for intercepting and pumping blockages for open channels, characterised in that, The invention relates to a water pumping device, comprising an intercepting module (1), a suction device (2) and a centrifugal pump (3), the intercepting module (1) is located in an open channel, the outlet of the intercepting module (1) is connected with the centrifugal pump (3) through the suction device (2); the intercepting module (1) comprises a meshing bag (1-1) with variable liquid level, which is used for intercepting impurities entering the centrifugal pump (3); at least one non-continuous inflection point is arranged in the flow channel of the suction device (2), which is used for forming a vortex or turbulent flow area; the meshing bag (1-1) in the intercepting module (1) is tapered, the inlet diameter of the meshing bag (1-1) is defined as L1; the suction device (2) comprises a water inlet pipe front section (2-1), a water inlet pipe middle section (2-2) and a water inlet pipe tail section (2-3) connected in sequence according to the flow direction; the water inlet pipe front section (2-1) is connected with the intercepting module (1); a non-continuous inflection point is arranged at the abutment between the water inlet pipe front section (2-1) and the water inlet pipe middle section (2-2), the water inlet pipe tail section (2-3) is connected with the inlet of the centrifugal pump (3); the water inlet pipe tail section (2-3) is parallel to the water surface; the water inlet pipe middle section (2-2) is an arc-shaped pipeline; the angle θ2 between the upper side of the water inlet pipe front section (2-1) and the water surface is in the range of 30°≤θ2≤45°; the angle between the lower side of the water inlet pipe front section (2-1) and the water surface is larger than θ2, the width L5 of the water inlet pipe front section (2-1) is in the range of 0.25L1≤L5≤0.5L1; the width L7 of the water inlet pipe tail section (2-3) is in the range of L5≤L7≤2L5; the water inlet pipe middle section (2-2) is a circular arc pipeline, the radius R1 of the circular arc pipeline is in the range of 5L7≤R1≤5L7; the length L6 of the circular arc pipeline is in the range of 0.5L1≤L6≤2L1. .

2. A device for intercepting and pumping blockages for open channels according to claim 1, characterized in that, The small end of the mesh bag is connected with the suction device (2), the small end of the mesh bag (1-1) is the outlet of the mesh bag (1-1), and the large end of the mesh bag is the inlet of the mesh bag (1-1); a float (1-3) is installed above the mesh bag (1-1) and used for suspending the mesh bag (1-1) on the liquid surface.

3. A device for intercepting and sucking blockages for open channels according to claim 2, characterized in that, The diameter L2 of the outlet of the mesh bag (1-1) ranges from 0.5L1 to L1, the upper length L3 of the mesh bag ranges from L1 to 1.2L1, the lower length L4 of the mesh bag ranges from L1 to 1.2L1, and the taper angle θ1 of the mesh bag (1-1) ranges from 30° to 45°.

4. The apparatus for intercepting and sucking the clogging material of the open channel according to claim 1, wherein, The centrifugal pump (3) is a fish-friendly spiral centrifugal pump, the diameter D1 of the impeller blade (3-1-2) of the centrifugal pump (3) ranges from 0.5L1 to 0.6L1, the length L8 of the impeller blade (3-1-2) of the centrifugal pump (3) ranges from 0.25L1 to 0.4L1, the width D2 of the impeller (3-1) of the centrifugal pump (3) ranges from 0.8L1 to L1, and the wrap angle θ3 of the impeller (3-1) of the centrifugal pump (3) ranges from 90° to 110°.

5. A device for intercepting and sucking blockages for open channels according to claim 4, characterized in that, The inlet diameter D3 of the suction section (3-8) of the centrifugal pump (3) ranges from 0.25L1 to 0.4L1, and the outlet diameter D4 of the outlet section (3-10) of the centrifugal pump (3) ranges from 0.25L1 to 0.4L1.

6. A device for intercepting and sucking blockages for open channels according to claim 4, characterized in that, The inlet angle and the outlet angle θ4 of the centrifugal pump (3) both range from 10° to 30°, the slope of the impeller hub (3-1-1) of the centrifugal pump (3) gradually changes from the inlet of the impeller to the outlet of the impeller, the slope K1 of the inlet of the impeller hub (3-1-1) ranges from 0.05 to 0.1, the slope K2 of the outlet of the impeller hub (3-1-1) ranges from 0.15 to 0.2, the slope of the impeller rim (3-1-3) of the centrifugal pump (3) gradually changes in the radial direction from the inlet of the impeller to the outlet of the impeller, and the slope K3 of the inlet of the impeller rim (3-1-3) in the radial direction ranges from 0.02 to 0.05; the slope K4 of the outlet of the impeller rim (3-1-3) in the radial direction ranges from 0.06 to 0.08.

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