Water suction pump with hollow impeller sandwich structure

Abstract

The utility model discloses a water suction pump with a hollow impeller interlayer structure, belongs to the technical field of water suction pumps, and overcomes the defects that in the prior art, a water suction pump is low in fish suction efficiency and water pumping efficiency and causes large damage to fishes, and according to the technical scheme for solving the problems, the water suction pump with the hollow impeller interlayer structure mainly comprises a pump shell, the water purifier comprises an inner shell and an outer shell arranged on the outer side of the inner shell in a sleeving mode, the inner shell and the outer shell are fixed, the second water inlet is formed in the inner shell and communicated with the first fluid channel, a filter screen is installed at the second water inlet, and a water spraying opening communicated with the first fluid channel and the second fluid channel is formed in the inner shell. The water injection nozzle inclines towards the first water outlet relative to the radial direction of the inner shell, so that water flow sprayed into the first fluid channel by the water injection nozzle inclines towards the first water outlet, and the second water inlet is formed in the upstream of the water injection nozzle. The water pump is mainly used for achieving coherent water pumping actions, increasing the fish sucking and water pumping efficiency and reducing damage to fishes after the fishes enter the water pump.

Description

Technical Field

[0001] This application relates to the technical field of water pumps, and in particular to a water pump with a hollow impeller sandwich structure. Background Technology

[0002] Water pumps are widely used in aquaculture, fishing, and transportation. For example, in operations such as changing water in fish ponds, fishing, and transferring live fish before transportation, if ordinary water pumps are used without protective measures, fish can easily be sucked into the pump, causing injury or even death.

[0003] In existing technologies, centrifugal pumps utilize hydraulic principles to drive the impellers within the pump body at high speed, creating negative pressure to suck up fish. The impeller channels are relatively wide, and most are double-bladed, with the inlet and outlet directions perpendicular. While this method offers high energy conversion efficiency, the fish suffer significant damage and a high mortality rate as they pass through the high-speed rotation of the impellers.

[0004] Another type of water pump uses a high-speed water flow to create negative pressure when ejected from a nozzle. This forces the fish-injected water through the suction port and suction pipe, and then into the fish-water separator along with the high-pressure water flow in the jet chamber. After filtration, the fish are obtained. This pump has a simple structure, low cost, no impeller, and a relatively low damage rate, but its fish-suction efficiency is relatively low. Utility Model Content

[0005] In order to overcome the shortcomings of existing water pumps, such as low efficiency in fish suction and water pumping, and significant damage to fish, this application provides a water pump with a hollow impeller jacket structure, which can achieve continuous pumping action, increase the efficiency of fish suction and water pumping, and reduce the damage to fish after entering the water pump.

[0006] To achieve the above objectives, this application adopts the following technical solution: a water pump with a hollow impeller sandwich structure, comprising a pump casing, which includes an inner casing and an outer casing fitted outside the inner casing. The inner casing and the outer casing are fixed. A first fluid channel is provided on the inner side of the inner casing. The first fluid channel has a first inlet and a first outlet. A second fluid channel is formed between the outer side of the inner casing and the outer casing. The second fluid channel has a second inlet. The second inlet is located in the inner casing and communicates with the first fluid channel. A filter screen is installed on the second inlet. A spray nozzle communicating with the first fluid channel and the second fluid channel is provided on the inner casing. The spray nozzle is inclined towards the first outlet direction relative to the radial direction of the inner casing, so that the water flow injected into the first fluid channel by the spray nozzle is inclined towards the first outlet direction. The second inlet is located upstream of the spray nozzle.

[0007] The propulsion component is installed in the second fluid channel and is used to push the water in the second fluid channel from the second inlet to the nozzle and spray it into the first fluid channel from the nozzle.

[0008] A drive assembly, which drives the propulsion component, is mounted on the housing.

[0009] The pump principle of this application is as follows: Water enters through the first inlet, then is drawn in through the second inlet (located in the inner shell, connecting to the first fluid channel). Driven by a propulsion component (such as an impeller or propeller), it is sprayed at high speed into the first fluid channel from the nozzle. The first fluid channel can be considered the core area of ​​the unpowered pumping system, and its pumping power mainly relies on the assistance of the water flow in the second fluid channel. The nozzle is inclined radially towards the first outlet relative to the inner shell. When the water in the second fluid channel is sprayed at high speed from the nozzle under the action of the propulsion component, due to the inclined angle, the water no longer enters the first fluid channel vertically or randomly, but instead generates an oblique thrust along the first fluid channel towards the first outlet. This thrust can accelerate the flow of water in the first fluid channel, creating a "booster" effect. Therefore, the water can flow out of the first outlet along the inclined direction of the nozzle.

[0010] After adopting the above technical solution, this application has the following advantages: The propulsion component is set in the second fluid channel and continuously drives the water flow in the second fluid channel, so that the spray nozzle forms a stable high-speed jet, driving the water flow in the first fluid channel to flow continuously, avoiding the pulsed water flow generated by the impeller rotation of traditional single-channel pumps, and ensuring the continuity and stability of the fish suction process in the first fluid channel; since no propulsion component is set in the first fluid channel, fish can avoid being harmed by the propulsion component and other driving components when passing through the first fluid channel. As can be seen from the above, both large fish and fry can be blocked outside the second fluid channel by the filter screen. These blocked fish cannot enter the second fluid channel and come into contact with the propulsion component, and will not suffer mechanical damage such as cutting or impact due to the high-speed rotation of the propulsion component. At the same time, the filter screen allows water to pass through, so that the water can smoothly enter the second fluid channel, ensuring the normal water circulation operation of the water pump.

[0011] Furthermore, multiple nozzles are distributed circumferentially along the axis of the inner shell and form a nozzle group; the extension lines of the nozzle axes within the same nozzle group intersect at the same position in the first fluid channel, which is the water flow convergence point of the nozzle group; several nozzle groups are spaced apart along the axis of the first fluid channel, and the water flow convergence points of the several nozzle groups are sequentially spaced apart along the flow direction of the fluid in the first fluid channel according to the arrangement order of the corresponding nozzle groups.

[0012] Using the aforementioned technical solution, multiple nozzles are distributed circumferentially along the inner shell axis to form nozzle groups. The extended axes of the nozzles within the same nozzle group intersect at the same position on the centerline of the first fluid channel. This arrangement allows the water jets from each nozzle to converge at the junction point, forming a stronger water flow and enhancing the propulsion effect on the water flow within the first fluid channel, thereby improving the efficiency of water pumping and fish suction. The arrangement of several nozzle groups at intervals along the axis of the first fluid channel, with the water flow confluence points arranged sequentially according to the corresponding nozzle group's arrangement along the fluid flow direction, helps ensure that the water flow within the first fluid channel receives a continuous and uniform thrust during flow, avoiding uneven local water flow velocity. This makes the water flow more stable and smooth, further ensuring the continuity and stability of the fish suction process and reducing disturbance and harm to the fish.

[0013] Furthermore, the propulsion component includes an annular impeller and blades disposed on the annular impeller, the annular impeller being sleeved on the outside of the inner tube and capable of rotating relative to the inner tube.

[0014] By adopting the aforementioned technical solution, the annular impeller is sleeved on the outside of the inner tube, which is highly compatible with the double-layer fluid channel structure composed of the inner shell and the outer shell, making full use of the annular space of the second fluid channel and making the structure more compact.

[0015] Furthermore, it also includes an inlet pipe and an outlet pipe. The inlet pipe is fixed to the pump casing and connected to the first inlet, and the outlet pipe is fixed to the pump casing and connected to the first outlet. A connecting component is provided at the end of the inlet pipe away from the first inlet, and a connecting component is provided at the end of the outlet pipe away from the first outlet.

[0016] Using the aforementioned technical solution, the inlet pipe is fixedly connected to the first inlet, and the outlet pipe is fixedly connected to the first outlet, ensuring the sealing of the water flow path and reducing leakage or air intake problems caused by loose interfaces, thus avoiding affecting the formation of negative pressure in the pump body and the pumping efficiency. The pipeline structure guides the water flow smoothly into the first fluid channel (inlet pipe) and out of the pump body (outlet pipe). Combined with the oblique thrust design of the spray nozzle inside the pump casing, it further reduces turbulence and energy loss at the inlet and outlet, improving the overall stability of fluid transmission. The setting of connection components (such as flanges, quick couplings, and other standardized interfaces) can be adapted to different specifications of water sources (such as fish ponds, reservoirs) or target containers (such as transport tanks, holding tanks), and is compatible with existing pipeline systems, improving the versatility of the equipment and the flexibility of applicable scenarios.

[0017] Furthermore, a water spray pipe is detachably installed on the inner shell, and the water spray nozzle is located inside the corresponding water spray pipe; the water spray pipe protrudes from the inner wall of the first fluid channel and is inclined relative to the radial direction of the inner shell towards the first water outlet, and the part of the water spray pipe protruding from the first fluid channel has a streamlined structure.

[0018] Using the aforementioned technical solution, when the inside of the spray pipe needs cleaning or replacement due to blockage or wear caused by impurities, it can be directly disassembled without affecting other components of the pump body (such as the propulsion component and filter screen), significantly reducing maintenance complexity and cost. The streamlined structure has a smooth, edgeless surface, which reduces mechanical damage caused by collisions or scratches even when the fish approaches the protruding part of the spray pipe.

[0019] Furthermore, the spray nozzle includes an inlet section and an outlet section that are interconnected. The inner diameter of the inlet section decreases from the inlet end to the outlet end, and the inner diameter of the outlet section increases from the inlet end to the outlet end. The inner diameter of the outlet section at the outlet end is greater than the inner diameter of the inlet section at the inlet end. The cone angle of the inlet section is 12° to 16°, and the cone angle of the outlet section is 24° to 28°.

[0020] Using the aforementioned technical solution, the constriction design of the inlet section creates negative pressure through the Venturi effect, which is equivalent to a "suction effect" between the second fluid channel and the nozzle. This passively absorbs more water flow, and combined with the active drive of the propulsion component (such as an annular impeller), further increases the water flow rate in the second fluid channel and the velocity entering the nozzle. The diffusion design of the outlet section converts the kinetic energy (high speed) of the water flow into pressure energy (high pressure) through the Venturi effect, allowing the ejected water flow to push the water flow in the first fluid channel with stable pressure, avoiding thrust fluctuations caused by sudden drops in flow velocity, and ensuring the continuity and stability of the fish suction process. The nozzle's structural design fully utilizes the principle of the Venturi tube, achieving the dual effect of "negative pressure water suction + pressure energy conversion" through a constriction-diffusion flow channel. This not only improves the fish suction efficiency and energy utilization of the pump, but also reduces harm to the fish through angle optimization.

[0021] Furthermore, the water outlet end of the spray nozzle is flush with the inner wall of the first fluid channel; or, the end face of the water outlet end of the spray pipe is perpendicular to the axis of the spray nozzle.

[0022] By adopting the aforementioned technical solution, the water outlet is flush with the inner wall, which can avoid the water nozzle from protruding and forming a "step" or "protrusion", reducing turbulence and energy loss when the fluid flows through, and making the mainstream fluid (such as the working medium in the pump) flow more smoothly.

[0023] The outlet end face is perpendicular to the nozzle axis, and the jet direction is strictly axial (such as spraying towards the pump outlet). The jet angle is fixed and concentrated, which can increase the pumping kinetic energy of the pump body and is beneficial to increasing the pumping and fish suction efficiency of the pump body.

[0024] Furthermore, the extension direction of the filter screen is parallel to the flow direction of the fluid in the first fluid channel; the filter screen protrudes from the inner wall of the first fluid channel.

[0025] Using the aforementioned technical solution, the extension direction of the filter screen is parallel to the water flow direction in the first fluid channel, allowing the water to flow smoothly along the surface of the filter screen and reducing the retention of impurities caused by vertical interception. Even if debris (such as aquatic plants and silt) adheres to the filter screen, the high-speed water flow can "wash it away" through shearing force, significantly reducing the risk of clogging, which is especially suitable for waters with turbidity or impurities (such as when there is a lot of mud at the bottom of a fishpond). The filter screen protrudes from the inner wall of the first fluid channel, forming a "buffer zone" so that when fish move with the water flow, they first contact the filter screen rather than directly impacting the pump casing or other rigid components, reducing collision damage. The edges of the protruding parts are rounded (such as rounded corners) to avoid sharp edges scratching the fish's body (especially the delicate scales of fry), further reducing the risk of mechanical injury.

[0026] Furthermore, the minimum diameter of the spray nozzle is d1, which is larger than the aperture of the filter screen by d2, and d1 ≥ 2d2.

[0027] Using the aforementioned technical solution, if the minimum diameter of the spray nozzle (d1) is smaller than or close to the filter screen aperture (d2), impurities (such as particles and fibers) intercepted on the filter screen may be drawn into the spray nozzle with the water flow, causing channel blockage and affecting fluid transport efficiency or equipment operational stability. By limiting d1 to ≥ 2d2, it can be ensured that the flow cross-section of the spray nozzle is always larger than the area of ​​a single hole in the filter screen, allowing small particles of impurities to be discharged through the spray nozzle after entering the filter screen. Furthermore, a larger spray nozzle diameter can reduce water flow resistance, avoiding problems such as increased turbulence or pressure drop caused by excessively small apertures.

[0028] Furthermore, the filter screen is detachably connected to the inner shell.

[0029] Using the aforementioned technical solution, in aquaculture environments, filter screens are easily clogged by impurities such as fish feces, aquatic plants, and algae. The detachable design allows users to directly remove the filter screen for rinsing or replacement without disassembling the entire pump body, significantly reducing maintenance time. Attached Figure Description

[0030] The following description, in conjunction with the accompanying drawings, further illustrates this application:

[0031] Figure 1 This is a schematic diagram of a water pump with a hollow impeller sandwich structure according to this application;

[0032] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0033] Figure 3 for Figure 1 Enlarged view at point B in the middle;

[0034] Figure 4 This is a full sectional view of the pump casing;

[0035] Figure 5 This is a full sectional view of the water spray pipe;

[0036] Figure 6 This is a schematic diagram of two embodiments of the filter screen.

[0037] Figure descriptions: 1. Pump casing; 2. Inner casing; 21. First fluid channel; 22. First inlet; 23. First outlet; 24. Inlet pipe; 25. Outer pipe; 3. Outer casing; 31. Second fluid channel; 32. Second inlet; 33. Spray nozzle; 34. Filter screen; 35. Spray pipe; 36. Inlet section; 37. Outlet section; 38. Inlet end; 39. Outlet end; 4. Propulsion component; 41. Annular impeller; 42. Blade; 5. Drive assembly; 6. Connecting assembly; 7. Guide component. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0039] The terms "first," "second," etc. (if present) in the specification and claims of this application are used to distinguish similar objects, not to describe a specific order or sequence. Even if "second" is used before a technical feature for distinction, it does not necessarily imply the presence of "first." It should be understood that in this application, "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. It should be understood that in this application, "multiple" refers to two or more. "And / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, X and / or Y can represent: X alone, X and Y simultaneously, and Y alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "Containing X, Y, and Z," "Containing X, Y, and Z" means that all three X, Y, and Z are included; "Containing X, Y, or Z" means that one of X, Y, and Z is included; "Containing X, Y, and / or Z" means that any one, two, or three of X, Y, and Z are included.

[0040] The technical solutions of this application will be described in detail below with specific embodiments. The following specific embodiments can be combined or substituted with each other according to the actual situation, and the same or similar concepts or processes may not be described again in some embodiments.

[0041] Example 1:

[0042] like Figures 1 to 6As shown, this application provides a water pump with a hollow impeller sandwich structure, including a pump casing 1, which includes an inner casing 2 and an outer casing 3 sleeved on the outside of the inner casing 2. The inner casing 2 and the outer casing 3 are fixed. A first fluid channel 21 is provided on the inner side of the inner casing 2. The first fluid channel 21 has a first inlet 22 and a first outlet 23. A second fluid channel 31 is formed between the outer side of the inner casing 2 and the outer casing 3. The second fluid channel 31 has a second inlet 32. The second inlet 32 ​​is located on the inner casing 2 and communicates with the first fluid channel 21. A filter screen 34 is installed on the second inlet 32. The inner casing 2 has a filter screen that communicates with the first fluid channel 21. The fluid channel 21 and the second fluid channel 31 have a water nozzle 33. The water nozzle 33 is inclined relative to the radial direction of the inner shell 2 towards the first outlet 23, so that the water flow injected into the first fluid channel 21 by the water nozzle 33 is inclined towards the first outlet 23. The second inlet 32 ​​is located upstream of the water nozzle 33. The propulsion member 4 is installed in the second fluid channel 31 and is used to push the water flow in the second fluid channel 31 from the second inlet 32 ​​towards the water nozzle 33 and be injected into the first fluid channel 21 by the water nozzle 33. The drive assembly 5 is used to drive the propulsion member 4 and is installed in the outer shell 3.

[0043] The pump principle of this application is as follows: Water enters from the first inlet 22, and is then drawn in through the second inlet 32 ​​(located in the inner shell 2, connected to the first fluid channel 21). After being driven by the propulsion component 4 (such as an impeller, propeller, etc.), it is sprayed at high speed into the first fluid channel 21 from the nozzle 33. The first fluid channel 21 can be regarded as the core area of ​​the unpowered pumping, and its pumping power mainly relies on the assistance of the water flow in the second fluid channel 31. The nozzle 33 is inclined relative to the radial direction of the inner shell 2 towards the first outlet 23. When the water in the second fluid channel 31 is sprayed out at high speed from the nozzle 33 under the action of the propulsion component 4, a negative pressure area is formed at the outlet end. This negative pressure area will drive the liquid upstream of the outlet end of the nozzle 33 to flow downstream. Due to the existence of the inclination angle, the water flow is no longer sprayed vertically or randomly into the first fluid channel 21, but generates an oblique thrust along the first fluid channel 21 towards the first outlet 23. This thrust can also accelerate the flow of water within the first fluid channel 21, creating a "booster" effect. Therefore, the water can flow out of the first outlet 23 along the inclined direction of the nozzle 33.

[0044] After adopting the above technical solution, this application has the following advantages: the propulsion component 4 is set in the second fluid channel 31 and continuously drives the water flow in the second fluid channel 31, so that the nozzle 33 forms a stable high-speed jet. A faster water flow will be generated at the outlet end of the nozzle 33, creating a negative pressure area, thereby driving the water flow in the first fluid channel 21 to flow continuously, avoiding the pulsed water flow generated by the impeller rotation of the traditional single-channel pump, and ensuring the continuity and stability of the fish suction process in the first fluid channel 21; since the propulsion component 4 is not set in the first fluid channel 21, fish can avoid being harmed by the propulsion component 4 and other driving components when passing through the first fluid channel 21. As described above, both large fish and fry can be blocked outside the second fluid channel 31 by the filter screen 34. These blocked fish cannot enter the second fluid channel 31 and come into contact with the propeller 4, thus avoiding mechanical damage such as cutting or impact from the high-speed rotation of the propeller 4. Similarly, by placing the propeller in the second fluid channel 31, hard objects such as fish cannot come into contact with the impeller, reducing impeller damage and increasing its service life. At the same time, the filter screen 34 allows water to flow through, ensuring that the water can smoothly enter the second fluid channel 31 and guaranteeing the normal water circulation operation of the water pump.

[0045] Specifically, the inner diameter of the first fluid channel 21 ranges from 50 to 250 mm, preferably 203.2 mm, and is equipped with a modular flange to accommodate various pipe types. The inner shell 2 is made of 304 stainless steel, with an inner diameter of 203.2 mm, an outer diameter of 233.2 mm, a height of 40 mm, and a sandwich thickness of 15 mm, and is equipped with a modular flange (suitable for 50-250 mm pipes).

[0046] Understandably, the mesh diameter of the filter screen 34 is smaller than that of the fish fry. The pump is mainly used for transporting coarsely dispersed two-phase mixtures and for the non-destructive transport of sensitive goods, such as transporting fluid materials like water, as well as aquatic products like fish, shrimp, and crabs. It can also transport liquids containing solid particles.

[0047] Furthermore, multiple nozzles 33 are distributed circumferentially along the axis of the inner shell 2 and form a nozzle group; the extension lines of the axes of the nozzles 33 in the same nozzle group intersect at the same position on the center line of the first fluid channel 21, which is the water flow confluence point of the nozzle group; several nozzle groups are arranged at intervals along the axis of the first fluid channel 21, and the water flow confluence points of the several nozzle groups are arranged at intervals along the flow direction of the fluid in the first fluid channel 21 according to the arrangement order of the corresponding nozzle groups.

[0048] Using the aforementioned technical solution, multiple nozzles 33 are circumferentially distributed along the axis of the inner shell 2, forming nozzle groups. The extended axes of the nozzles 33 within the same nozzle group intersect at the same position on the centerline of the first fluid channel 21. This arrangement allows the water jets from each nozzle 33 to converge at the confluence point, forming a stronger water flow and enhancing the propulsion effect on the water flow within the first fluid channel 21, thereby improving the efficiency of water pumping and fish suction. The arrangement of several nozzle groups at intervals along the axis of the first fluid channel 21, with the water flow confluence points arranged sequentially according to the corresponding nozzle group's arrangement along the fluid flow direction, helps ensure that the water flow within the first fluid channel 21 receives a continuous and uniform thrust during flow, avoiding uneven local water flow velocity. This makes the water flow more stable and smooth, further ensuring the continuity and stability of the fish suction process and reducing disturbance and harm to the fish.

[0049] Specifically, the number of nozzles 33 is 54, the spray speed is 20m / s, and it can reduce the liquid flow rate at both ends from 0.00085m³ / h. 3 / s magnified to 0.125m 3 / s (7500L / min), with a magnification of 147 times. The outlet shape of the nozzle 33 is cylindrical (1mm) + trumpet-shaped (2mm, diffusion angle 26.6°), distributed in a 9×6 matrix with a spacing of 70.9mm×6.7mm.

[0050] Understandably, the water flow confluence point of the upstream nozzle group is located upstream of the water flow confluence point of the downstream nozzle group. This allows the upstream water flow confluence point to be driven downstream by the downstream water flow before turbulence is formed, reducing the overall turbulence phenomenon. Furthermore, the layered water flow can exert a layered acceleration effect, promoting the acceleration of the water flow.

[0051] Furthermore, it also includes an inlet pipe 24 and an outlet pipe 25. The inlet pipe 24 is fixed to the pump housing 1 and communicates with the first inlet 22. The outlet pipe 25 is fixed to the pump housing 1 and communicates with the first outlet 23. The end of the inlet pipe 24 away from the first inlet 22 is provided with a connecting component 6, and the end of the outlet pipe 25 away from the first outlet 23 is provided with a connecting component 6.

[0052] Using the aforementioned technical solution, the inlet pipe 24 is fixedly connected to the first inlet 22, and the outlet pipe 25 is fixedly connected to the first outlet 23, ensuring the sealing of the water flow path and reducing leakage or air intake problems caused by loose interfaces, thus avoiding affecting the formation of negative pressure in the pump body and the pumping efficiency. The pipeline structure can guide the water flow smoothly into the first fluid channel 21 (inlet pipe 24) and out of the pump body (outlet pipe 25). Combined with the oblique thrust design of the spray nozzle 33 inside the pump casing 1, it further reduces turbulence and energy loss at the inlet and outlet, improving the overall stability of fluid transmission. The setting of the connecting components 6 (such as flanges, quick couplings, and other standardized interfaces) can be adapted to different specifications of water sources (such as fish ponds, reservoirs) or target containers (such as transport tanks, temporary holding tanks), and is compatible with existing pipeline systems, improving the versatility of the equipment and the flexibility of applicable scenarios.

[0053] Furthermore, the water nozzle 33 includes an inlet section 36 and an outlet section 37 that are interconnected. The inner diameter of the inlet section 36 decreases from the inlet end 38 to the outlet end 39, and the inner diameter of the outlet section 37 increases from the inlet end 38 to the outlet end 39. The inner diameter of the outlet section 37 at the outlet end 39 is greater than the inner diameter of the inlet section 36 at the inlet end 38. The cone angle of the inlet section 36 is 12° to 16°, and the cone angle of the outlet section 37 is 24° to 28°.

[0054] Using the aforementioned technical solution, the contraction design of the inlet section 36 creates negative pressure through the Venturi effect, which is equivalent to generating a "suction effect" between the second fluid channel 31 and the nozzle 33. This passively absorbs more water flow, and with the active drive of the propulsion component 4 (such as the annular impeller 41), it further increases the water flow rate in the second fluid channel 31 and the velocity entering the nozzle 33. The diffusion design of the outlet section 37 converts the kinetic energy (high speed) of the water flow into pressure energy (high pressure) through the Venturi effect, so that the ejected water flow pushes the water flow in the first fluid channel 21 with stable pressure, avoiding thrust fluctuations caused by a sudden drop in flow velocity, and ensuring the continuity and stability of the fish suction process. The structural design of the nozzle 33 fully utilizes the principle of the Venturi tube, achieving the dual effect of "negative pressure water suction + pressure energy conversion" through a contraction-diffusion flow channel. This not only improves the fish suction efficiency and energy utilization of the pump, but also reduces harm to the fish through angle optimization.

[0055] Specifically, such as Figure 5 As shown, the cone angle of the inlet section 36 is ∠α, and the cone angle of the outlet section 37 is ∠β.

[0056] Furthermore, the water outlet 39 of the spray nozzle 33 is flush with the inner wall of the first fluid channel 21; or, the end face of the water outlet 39 of the spray pipe 35 is perpendicular to the axial direction of the spray nozzle 33.

[0057] By adopting the aforementioned technical solution, the water outlet 39 is flush with the inner wall, which can prevent the water nozzle 33 from protruding and forming a "step" or "protrusion", reducing turbulence and energy loss when the fluid flows through, and making the mainstream fluid (such as the working medium in the pump) flow more smoothly.

[0058] The end face of the water outlet 39 is perpendicular to the axis of the nozzle 33, and the spray direction is strictly axial (such as spraying towards the pump outlet). The spray angle is fixed and concentrated, which can increase the pumping kinetic energy of the pump body and is beneficial to increasing the pumping and fish suction efficiency of the pump body.

[0059] Furthermore, a water spray pipe 35 is detachably installed on the inner shell 2, and the water spray nozzle 33 is located inside the corresponding water spray pipe 35; the water spray pipe 35 protrudes from the inner wall of the first fluid channel 21 and is inclined relative to the radial direction of the inner shell 2 towards the first water outlet 23, and the part of the water spray pipe 35 protruding from the first fluid channel 21 has a streamlined structure.

[0060] Using the aforementioned technical solution, when the inside of the spray pipe 35 needs cleaning or replacement due to blockage or wear caused by impurities, it can be directly disassembled without affecting other components of the pump body (such as the propeller 4 and the filter screen 34), significantly reducing maintenance complexity and cost. The streamlined structure has a smooth, edgeless surface, which reduces mechanical damage caused by collisions or scratches even when the fish approaches the protruding part of the spray pipe 35.

[0061] Understandably, in another embodiment 2: the spray nozzle 33 is a through hole on the side wall of the inner tube, which is inclined to the axis of the inner tube and the outlet faces the first outlet 23; in this embodiment, the spray nozzle 33 is also provided with a guide component 7 located at the water inlet end 38 and the water outlet end 39 of the spray nozzle 33, so that the water flow can be smoothly introduced into the spray nozzle 33 and sprayed towards the first outlet 23. Specifically, the guide component 7 can be a semi-enclosed structure, with the water inlet end 38 located on the side away from the propulsion member 4, so that the water flow is introduced into the spray nozzle 33 by the guide component 7; the water outlet end 39 is located on the side away from the first outlet 23, so that the water flow can be directly guided to the first outlet 23, avoiding flow in other directions.

[0062] Example 3: Based on Example 1 or Example 2 above, the propulsion component 4 includes an annular impeller 41 and blades 42 disposed on the annular impeller 41. The annular impeller 41 is sleeved on the outside of the inner tube and can rotate relative to the inner tube.

[0063] Using the aforementioned technical solution, the annular impeller 41 is fitted on the outside of the inner tube, which is highly compatible with the double-layer fluid channel structure formed by the inner shell 2 and the outer shell 3, making full use of the annular space of the second fluid channel 31 and making the structure more compact.

[0064] Specifically, the annular impeller 41 is placed in the interlayer between the inner shell 2 and the outer shell 3. The second fluid channel 31 has a small diameter of 205.2 mm and an outer diameter of 229.2 mm, and is equipped with 12 reinforcing ribs and 4 heavy-duty bearings (with a load capacity of 8000 N). The annular impeller is made of PA66-GF30 material, with a hollow diameter of 205.2 mm and an outer diameter of 229.2 mm. It contains 12 blades (8 mm high, with an angle of 30°-45°), 12 reinforcing ribs (2×5×20 mm), and 4 61944 bearings (single bearing dynamic load 2000 N, total load capacity 8000 N).

[0065] Understandably, the annular impeller 41 is rotatably connected to the inner or outer tube via a bearing; a support ring is provided between the annular impeller 41 and the inner tube, a fixing ring is sealed and fixed on the outer tube, and a sealing ring is provided between the annular impeller 41 and the fixing ring; the annular impeller 41 and the fixing ring are rotatably connected via a bearing; the drive assembly 5 drives the annular impeller 41 to rotate via a belt drive assembly; or, the drive assembly 5 drives the annular impeller 41 to rotate via a gear drive assembly. The gear drive assembly is driven by a 2.2kW motor via an HTD5M-400-15 synchronous belt (15mm wide) to rotate the annular impeller 41.

[0066] Furthermore, the extension direction of the filter screen 34 is parallel to the flow direction of the fluid in the first fluid channel 21; the filter screen 34 is provided to protrude from the inner wall of the first fluid channel 21.

[0067] Using the aforementioned technical solution, the extension direction of the filter screen 34 is parallel to the water flow direction within the first fluid channel 21, allowing the water to flow smoothly along the surface of the filter screen 34 and reducing impurity retention caused by vertical interception. Even if debris (such as aquatic plants or silt) adheres to the filter screen 34, the high-speed water flow can "wash it away" through shearing force, significantly reducing the risk of clogging, especially suitable for turbid water or waters containing impurities (such as when there is a lot of bottom mud in fishponds). The filter screen 34 protrudes from the inner wall of the first fluid channel 21, forming a "buffer zone," so that when fish move with the water flow, they first contact the filter screen 34 rather than directly impacting the pump casing 1 or other rigid components, reducing collision damage. The edges of the protruding parts are rounded (such as rounded chamfers) to avoid sharp edges scratching the fish's body (especially the delicate scales of fry), further reducing the risk of mechanical injury.

[0068] Specifically, the water inlet direction of the second water inlet 32 ​​is perpendicular to the extension direction within the first fluid channel 21; the edge of the protruding part of the filter screen 34 is smoothly rounded; the filter screen 34 can be made of soft materials, such as engineering plastics (PVC, PP, PE), nylon (PA), and polytetrafluoroethylene (PTFE, Teflon), or it can be made of softer metal materials, etc., to reduce harm to fish.

[0069] Understandably, in another embodiment, the filter surface of the filter screen 34 faces the first water inlet 22. When objects in the water move with the water flow, such as fish, they can collide with the filter screen 34, causing items that obstruct water entry to be knocked off and washed away to some extent by the water flow.

[0070] Furthermore, the minimum diameter of the spray nozzle 33 is d1, which is larger than the aperture of the filter screen 34 by d2, where d1 ≥ 2d2.

[0071] Using the aforementioned technical solution, if the minimum diameter (d1) of the spray nozzle 33 is smaller than or close to the aperture (d2) of the filter screen 34, impurities (such as particles and fibers) intercepted on the filter screen 34 may be drawn into the spray nozzle 33 with the water flow, causing channel blockage and affecting fluid transport efficiency or equipment operational stability. By limiting d1 to ≥ 2d2, it can be ensured that the flow cross-section of the spray nozzle 33 is always larger than the area of ​​a single aperture of the filter screen, allowing small particles of impurities to be discharged through the spray nozzle 33 after entering the filter screen. Furthermore, a larger diameter of the spray nozzle 33 can reduce water flow resistance and avoid problems such as increased turbulence or pressure drop caused by excessively small apertures.

[0072] Specifically, the first fluid channel 21 (203.2mm) can hold 1.2kg of fish, and the filter screen 34 has a pore size d2 of 0.5mm, which can intercept 0.2g of fish.

[0073] Furthermore, the filter screen 34 is detachably connected to the inner shell 2.

[0074] Using the aforementioned technical solution, in aquaculture environments, the filter screen 34 is easily clogged by impurities such as fish feces, aquatic plants, and algae. The detachable design allows users to directly remove the filter screen for rinsing or replacement without disassembling the entire pump body, significantly shortening maintenance time.

[0075] The technical advantages of the above solution are:

[0076] Ultra-large flow rate: The flow rate is increased by 147 times, reaching 7500L / min, which meets the needs of large-scale circulating water.

[0077] Multi-diameter compatibility: Compatible with 50-250mm pipes, modular flanges facilitate installation.

[0078] High efficiency and durability: system efficiency 83.3%, impeller life >20,000 hours.

[0079] Fish protection: Large fish pass rate >99%, small fish interception rate >99%, no fish damage.

[0080] High versatility: suitable for aquaculture, industrial circulating water, and agricultural irrigation.

[0081] Based on the above design, the performance parameters of this water pump are: Flow rate: 7500 L / min (0.125 m³ / min). 3 / s). Head: 12m. Suction head: 3m. System efficiency: 83.3%. Interlayer pressure: 1,447,000Pa. Jet velocity at nozzle 33: 20m / s.

[0082] In addition to the preferred embodiments described above, this application has other implementation methods. All other embodiments obtained by those skilled in the art based on the embodiments in this application without creative effort are within the scope of protection claimed in this application.

Claims

1. A pump having a hollow impeller sandwich structure, characterized by, The pump comprises a pump shell, a first fluid channel, a second fluid channel, a propelling member, and a driving assembly.

2. A pump according to claim 1, wherein the impeller is provided with a hollow sandwich structure, characterized in that The water outlet of the water jet nozzle is flush with the inner wall of the first fluid channel, or the end surface of the water outlet of the water jet pipe is perpendicular to the water jet nozzle.

3. A pump according to claim 1, wherein the impeller is provided with a hollow sandwich structure, and The extension direction of the filter screen is parallel to the flow direction of the fluid in the first fluid channel.

4. A pump according to claim 1, wherein the impeller is provided with a hollow sandwich structure, and The minimum diameter of the water jet nozzle is d1, which is greater than the pore diameter d2 of the filter screen, and d1≥2d2.

5. A pump according to claim 1, wherein the impeller is provided with a hollow sandwich structure, and The filter screen is detachably connected with the inner shell.

6. A pump according to claim 1, wherein the impeller is provided with a hollow sandwich structure. ​ 7. A pump according to claim 5, wherein the impeller is formed of a plurality of hollow blades. ​ 8. A pump according to any one of claims 1 to 6, wherein the impeller has a sandwich structure. ​ 9. A pump according to any one of claims 1 to 6, wherein the impeller has a sandwich structure. ​ 10. A pump according to any one of claims 1 to 6, wherein the impeller has a sandwich structure. ​

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