Long axis screw fish pump

Abstract

This invention relates to the field of spiral pump technology and discloses a long-shaft spiral fish pump, comprising a housing, a long-shaft spiral impeller, a drive shaft, and a drive motor. The housing has a fish inlet on its left side and a fish outlet on its upper side, used for fish entry and exit, respectively. The drive shaft passes through the housing and is rotatably connected to it. The portion of the drive shaft inside the housing is fixed to the long-shaft spiral impeller, which rotates within the housing to generate suction. The drive motor is connected to the drive shaft via a coupling and drives the drive shaft to rotate. This invention offers advantages such as anti-clogging, low damage, high efficiency, and strong cavitation resistance. It exhibits good adaptability to transporting media with high solids content and is specifically designed for fish protection, balancing transport performance with fish protection and reducing operating and maintenance costs.

Description

Technical Field

[0001] This invention relates to the field of spiral pump technology, and more particularly to a long-shaft spiral fish pump. Background Technology

[0002] Fish pumps primarily replace manual labor in fish transport, gently, efficiently, and with minimal damage, sucking, transferring, and transporting live or adult fish. This significantly reduces fish injury and stress, improves aquatic survival rates and quality, while also reducing labor intensity and increasing transport efficiency, meeting the continuous and large-scale transport needs of aquaculture, fishing, processing, and loading scenarios.

[0003] Currently, large-scale fishing mainly employs two methods: one is using fishing nets for repeated catching, which is inefficient; the other is using vacuum fish pumps, which are highly automated and can draw fish and water mixtures into a collection cylinder, but this can easily cause fish to squeeze and be injured by impact, resulting in economic losses. While existing screw pumps can efficiently transport liquids, their short impeller shafts due to design limitations prevent fish from passing smoothly through the impeller, causing blockages and pump malfunctions. Therefore, there is an urgent need to develop a long-shaft screw fish pump that is anti-clogging, low-damage, highly efficient, and cavitation-resistant, adaptable to high-solids-content media, and specifically designed for fish protection. This pump should balance transport performance with fish protection, reduce operating and maintenance costs, overcome current shortcomings, and meet current needs. Summary of the Invention

[0004] The purpose of this invention is to provide a long-shaft spiral fish pump to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A long-shaft spiral fish pump includes a housing, a long-shaft spiral impeller, a drive shaft, and a drive motor. The housing has a fish inlet on its left side and a fish outlet on its upper side, for the fish to enter and exit, respectively. The drive shaft passes through and is rotatably connected to the housing. The portion of the drive shaft inside the housing is fixed to the long-shaft spiral impeller, which rotates within the housing to generate suction. The drive motor is connected to the drive shaft via a coupling and drives the drive shaft to rotate.

[0007] Preferably, a sealing ring is provided at the contact portion between the outer casing and the drive shaft.

[0008] Preferably, a shaft sealing device is also provided at the contact position between the outer casing and the drive shaft.

[0009] Preferably, the gap between the rim of the long-shaft spiral impeller and the inner surface of the outer casing is 0.5 to 2 mm.

[0010] Preferably, the blade rim inlet angle of the long-shaft spiral impeller is 10° to 15°, the blade inclination angle on the rim side is 30° to 50°, the blade rim outlet angle is 5° to 15°, and the axial length of the impeller is 2 to 5 times the impeller rotation diameter.

[0011] The beneficial effects of this invention are:

[0012] 1. Excellent anti-clogging performance: Existing long-shaft pumps may experience clogging when used to transport fluids containing fish or other solid debris, especially when the solid debris particles are large or the fibers are long, easily getting stuck in the impeller or pump casing. Long-shaft spiral fish pumps, however, typically use a spiral centrifugal impeller. The sharp angle at the blade inlet guides debris towards the shaft center, and then the spiral action propels it axially, resulting in truly clogging-free performance. This effectively prevents long fibers and solid materials from clogging the pump, allowing for the smooth transport of live fish and accompanying aquatic plants and other debris.

[0013] 2. Minimal Damage During Transport: Ordinary long-shaft pumps operate at high impeller speeds, subjecting the fluid to significant impact and shear forces. For fragile media such as live fish, this can easily cause injury and scale loss. The newly designed long-shaft spiral fish pump employs special three-dimensional spiral blades, combining the volumetric induction effect of the spiral with the centrifugal force of the blades to transport the medium. This achieves "gentle transport," ensuring the live fish are transported intact and maintain their original physical state.

[0014] 3. High operating efficiency: Some existing long-shaft pumps may experience efficiency issues when conveying solid-liquid mixtures due to impeller structure and other limitations, especially when the solid content of the medium is high, resulting in a significant drop in efficiency. Long-shaft spiral fish pumps, on the other hand, offer high operating efficiency with a wide high-efficiency range. Their steep QH curve indicates a broad stable operating area, and the curve drift is minimal when pumping complex media, thus reducing operating costs.

[0015] 4. Strong resistance to cavitation: Some traditional long-shaft pumps are prone to cavitation during operation if the suction conditions are poor or the liquid contains gas, which affects the pump's performance and service life, and may even damage the impeller in severe cases. Long-shaft spiral fish pumps have low net suction head and strong resistance to cavitation, enabling stable operation under complex working conditions and reducing malfunctions and maintenance costs caused by cavitation.

[0016] 5. Significant advantage in conveying media with high solids content: Conventional long-shaft pumps often perform poorly in conveying fluids with high solids content, easily leading to problems such as accelerated wear, reduced efficiency, and even blockage. Long-shaft spiral fish pumps can convey media with high solids content, such as mud with high solids content. In aquaculture, they are more adaptable when conveying pond water containing a lot of solid particles such as mud and sand, along with live fish.

[0017] 6. More targeted design: The newly designed long-shaft spiral fish pump pays more attention to the protection of fish. For example, the blade width gradually decreases from the middle to the outside, which can prevent fish from being entangled in the screw or subjected to greater impact. These designs are not available in ordinary long-shaft pumps.

[0018] In summary, this invention has the advantages of being anti-clogging, low-damage, high-efficiency, and strong cavitation resistance. It is well-suited for conveying media with high solids content and has a special design for fish protection, which can balance conveying performance and fish protection, thereby reducing operating and maintenance costs. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0020] Figure 2 This is a schematic diagram of the sealing ring structure in this invention.

[0021] Legend:

[0022] 1. Outer shell; 2. Fish inlet; 3. Fish outlet; 4. Long-shaft spiral impeller; 5. Sealing ring; 6. Shaft sealing device; 7. Drive shaft; 8. Coupling; 9. Drive motor. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] Specific implementation examples are given below.

[0025] See Figures 1-2In this embodiment of the invention, a long-shaft spiral fish pump includes a housing 1, a long-shaft spiral impeller 4, a drive shaft 7, and a drive motor 9. The left side of the housing 1 is provided with a fish inlet 2, and the upper end of the housing 1 is provided with a fish outlet 3. The fish inlet 2 and the fish outlet 3 are used for the entry and exit of fish, respectively. The drive shaft 7 passes through the housing 1 and is rotatably connected to it. The part of the drive shaft 7 located inside the housing 1 is fixed to the long-shaft spiral impeller 4. The long-shaft spiral impeller 4 is used to rotate inside the housing 1 to generate suction force. The drive motor 9 is connected to the drive shaft 7 through a coupling 8, and the drive motor 9 is used to drive the drive shaft 7 to rotate.

[0026] A sealing ring 5 is provided at the contact part between the outer casing 1 and the drive shaft 7, and a shaft sealing device 6 is also provided at the contact position between the outer casing 1 and the drive shaft 7. The sealing performance is improved by the sealing ring 5 and the shaft sealing device 6 to prevent water leakage.

[0027] The gap between the rim of the long-shaft spiral impeller 4 and the inner surface of the outer casing 1 is 0.5 to 2 mm. The gap can prevent the fish from getting stuck in the gap and causing squeezing or abrasion, while reducing the turbulence of the fluid at the gap and reducing the impact on the fish.

[0028] The blade rim inlet angle of the long-shaft spiral impeller 4 is 10°–15°. This relatively small, acute blade inlet angle guides the fish smoothly into the impeller channel, preventing the fish from colliding with the blades due to an excessively steep inlet angle. The blade rim outlet angle is 5°–15°. This nearly gentle outlet angle allows the fish to experience more even force when leaving the impeller, reducing collision damage during high-speed ejection. The blade inclination angle on the rim side is 30°–50°. This inclination angle ensures the spiral propulsion force while avoiding excessive local turbulence caused by an excessively large inclination angle, achieving "gentle transport," which is especially suitable for protecting fish with fragile scales or larger bodies. The axial length of the impeller is 2–5 times the impeller's rotor diameter, ensuring the spiral propulsion force while avoiding excessive weight or vibration problems caused by an excessively long impeller, reducing motor load and energy loss. The design of these parameters meets the requirements of transport efficiency and adaptability in fisheries operations, while minimizing fish damage, ultimately enhancing the practical and economic value of the fish pump.

[0029] Working principle: In use, the drive motor 9 drives the transmission shaft 7 and the long-shaft spiral impeller 4 to rotate. Through the design of the long-shaft spiral impeller 4, a negative pressure is formed inside the pump body when the impeller rotates at high speed. Under the action of pressure, a positive thrust is provided, which makes the fish and water mixture sucked into the fish inlet 2. The impeller blades at the fish inlet 2 guide the fish flow to the vicinity of the axis, and then use the spiral action to make it spirally advance along the axis to form a spiral fish passage. The spiral thrust makes the fish and water mixture advance smoothly and transport it to the centrifugal part of the impeller. Then, the centrifugal part pushes the fish and water mixture out of the fish outlet 3.

[0030] All electrical components mentioned in the text are electrically connected to the main controller and power supply. The main controller can be a conventional and known device such as a computer, and the existing publicly available power connection technology will not be elaborated in the text.

[0031] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0032] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A long shaft screw fish pump characterized by, The device includes a housing (1), a long-shaft spiral impeller (4), a drive shaft (7), and a drive motor (9). The left side of the housing (1) is provided with a fish inlet (2), and the upper side of the housing (1) is provided with a fish outlet (3). The fish inlet (2) and the fish outlet (3) are used for the fish to enter and exit, respectively. The drive shaft (7) passes through the housing (1) and is rotatably connected to it. The part of the drive shaft (7) located inside the housing (1) is fixed to the long-shaft spiral impeller (4). The long-shaft spiral impeller (4) is used to generate suction force by rotating inside the housing (1). The drive motor (9) is connected to the drive shaft (7) through a coupling (8). The drive motor (9) is used to drive the drive shaft (7) to rotate.

2. The long shaft screw fish pump according to claim 1, characterized in that, A sealing ring (5) is provided at the contact portion between the outer casing (1) and the drive shaft (7).

3. The long axis screw fish pump of claim 1, wherein, A shaft sealing device (6) is also provided at the contact position between the outer shell (1) and the drive shaft (7).

4. The long axis screw fish pump of claim 1, wherein, The gap between the rim of the long-shaft spiral impeller (4) and the inner surface of the outer casing (1) is 0.5 to 2 mm.

5. The long-shaft spiral fish pump according to claim 4, characterized in that, The blade rim inlet angle of the long-shaft spiral impeller (4) is 10° to 15°, the blade inclination angle on the rim side is 30° to 50°, the blade rim outlet angle is 5° to 15°, and the axial length of the impeller is 2 to 5 times the impeller rotation diameter.

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