A shaftless pump for water temperature regulation and an aquaculture system using the shaftless pump

Abstract

This invention relates to the field of aquaculture equipment technology, and discloses a shaftless pump for water temperature regulation and an aquaculture system using the shaftless pump. The system includes: a longitudinally arranged cylindrical body with an open bottom; multiple nozzles arranged circumferentially on the upper side wall of the cylindrical body; an annular outer rotor rotatably connected to the cylindrical body; a multi-pole permanent magnet stator fixedly embedded in the cylindrical body on the outer circumferential surface of the outer rotor, with the stator and the multi-pole permanent magnet radially opposite each other; a shaftless rotor impeller connected to the outer rotor for rotation under the drive of the outer rotor to transport water; and a frequency converter electrically connected to the stator windings for vector and torque control to achieve smooth start-stop and speed regulation. This shaftless pump aquaculture system can efficiently, environmentally friendly, and safely regulate water temperature; the entire water temperature regulation can be automatically closed-loop controlled, and temperature regulation can be achieved without reducing oxygen levels, ensuring the healthy growth of aquatic organisms.

Description

Technical Field

[0001] This invention relates to the field of aquaculture equipment technology, and in particular to a shaftless pump for water temperature regulation and an aquaculture system using the shaftless pump. Background Technology

[0002] Maintaining a suitable water temperature is a key environmental factor for ensuring the healthy growth of cultured organisms in enclosed water bodies. Traditional methods of water temperature regulation in winter primarily involve using heat pump systems to directly heat the water. However, this direct heating method not only consumes a lot of energy, increasing aquaculture costs, but also easily leads to uneven heating of the water, creating localized temperature differences that negatively impact the uniformity of growth and development of cultured organisms.

[0003] To overcome the shortcomings of traditional heat pump heating technology, a new water temperature regulation method based on the natural thermal stratification characteristics of water has been developed. This method uses a water pump to perform vertical water exchange, utilizing the differences in heat distribution within the water body to regulate temperature, ultimately bringing the water temperature to an equilibrium state similar to that of the bottom layer. Compared to traditional heat pump heating methods, this water temperature regulation method offers advantages such as lower energy consumption, smaller temperature fluctuations, higher system stability, avoidance of potential localized overheating problems, and better maintenance of the water environment's stability.

[0004] However, the above-mentioned water temperature regulation scheme involving the exchange of water between upper and lower bodies still faces the following technical problems that urgently need to be solved in practical applications: First, existing systems mostly use ordinary water pumps for water lifting operations, but the water lifting capacity of ordinary water pumps is limited per unit time. For large-area aquaculture water bodies, it is difficult to achieve effective temperature adjustment in a short period of time, resulting in low regulation efficiency and difficulty in meeting the temperature control requirements of large-scale aquaculture. Second, ordinary water pumps generate significant mechanical vibration and noise during operation. These physical disturbances can easily cause significant stress responses in aquaculture organisms, and in severe cases, may even lead to stunted growth or increased mortality, directly affecting aquaculture efficiency. Summary of the Invention

[0005] This invention proposes a shaftless pump for water temperature regulation and an aquaculture system using the shaftless pump to overcome the shortcomings of the prior art. The shaftless pump and its aquaculture system can achieve water temperature regulation efficiently, environmentally friendly and safely; and the entire water temperature regulation can be automatically closed-loop controlled, and temperature regulation can be achieved without reducing oxygen, ensuring the healthy growth of aquatic organisms.

[0006] The technical solution of the present invention is as follows: In a first aspect, the present invention proposes a water temperature regulating shaftless pump, which is installed in an aquaculture water body, comprising: a cylinder, an outer ring rotor, a stator, a shaftless rotor impeller, and a frequency converter. The cylinder is arranged longitudinally, with an open bottom end, and multiple nozzles are arranged circumferentially above the side wall of the cylinder. The outer ring rotor is annular and rotatably connected to the cylinder body, and a multi-pole permanent magnet is fixed on the outer circumferential surface of the outer ring rotor. The stator is fixedly embedded in the cylinder body, and the stator and the multi-pole permanent magnet are radially opposite each other. The stator has windings. The shaftless rotor impeller is connected to the outer ring rotor and is used to rotate under the drive of the outer ring rotor to transport water from the bottom to the top of the cylinder body and discharge it from the nozzles. The frequency converter is electrically connected to the windings of the stator and is used to cooperate with vector control to achieve smooth start-up and shutdown and speed regulation.

[0007] In at least one embodiment of the present invention, the plurality of nozzles are connected to the cylinder through conduits, each conduit is connected to the cylinder through a hinge, and each conduit is connected to an adjustment part, which is used to drive the conduit to deflect around the hinge to adjust the jet direction of each nozzle.

[0008] In at least one embodiment of the present invention, a gas-liquid mixing chamber is provided in the cylinder near the bottom opening, and the gas-liquid mixing chamber is connected to a high-pressure gas source. The high-pressure gas source is used to introduce air or pure oxygen into the gas-liquid mixing chamber to achieve temperature regulation without reducing oxygen.

[0009] In at least one embodiment of the present invention, a lifting component is connected to the cylinder body, the lifting component is fixed to the bottom of the water body, and the lifting component is used to control the deployment depth of the cylinder body in the aquaculture water body.

[0010] In at least one embodiment of the present invention, the inner diameter of the cylinder is 0.6m to 2.0m, and the rotational speed of the shaftless rotor impeller is 100r / min to 300r / min.

[0011] In at least one embodiment of the present invention, the number of shaftless rotor impellers is 4 to 6, the blade tip installation angle of each shaftless rotor impeller blade is 10° to 12°, and the blade root installation angle of each shaftless rotor impeller blade is 17° to 19°.

[0012] In at least one embodiment of the present invention, an air ring is fitted on the outer side of the gas-liquid mixing chamber on the cylinder. The air ring is connected to a high-pressure gas source through an air guide pipe. The air ring is provided with a plurality of air distribution pipes extending into the gas-liquid mixing chamber. Each air distribution pipe is horizontally arranged in the gas-liquid mixing chamber, and each air distribution pipe has a plurality of air outlet holes at its top.

[0013] In at least one embodiment of the present invention, the adjusting part includes a collar fitted on the cylinder, a plurality of support rods and a telescopic member, one end of the plurality of support rods being hinged to the collar, the other end of the plurality of support rods being hinged to the plurality of guide tubes respectively, and the two ends of the telescopic member being connected to the collar and the outer wall of the cylinder respectively; the outer ring rotor is rotatably connected to the inner wall of the cylinder through a water-lubricated bearing.

[0014] In a second aspect, the present invention proposes an aquaculture system, comprising: an aquaculture pond, multiple temperature sensors, and a controller, wherein the cylinder is longitudinally arranged in the water body of the aquaculture pond; the multiple temperature sensors are arranged at different water depths in the aquaculture pond; the controller is signal-connected to the multiple temperature sensors, a frequency converter, and a regulating unit, and the controller is used to control the start / stop, speed, and forward / reverse rotation of the water temperature regulating shaftless pump according to the temperature difference at different water depths through the frequency converter, and to control the spray direction of each nozzle through the regulating unit, so as to achieve closed-loop control of constant water temperature.

[0015] In at least one embodiment of the present invention, a plurality of oxygen sensors are arranged in the aquaculture pond, and the plurality of oxygen sensors, high-pressure gas source and lifting device are all connected to the controller signal.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention comprises an outer ring rotor with multi-pole permanent magnets rotatably connected to a cylinder with a nozzle at the top, a stator fixed inside the cylinder and radially opposite to the outer ring rotor, and a shaftless rotor impeller connected to the outer ring rotor. This shaftless pump directly drives the shaftless rotor impeller to rotate using electromagnetic force, thereby transporting water from the bottom to the top of the cylinder and discharging it from the nozzle. The shaftless pump adopts an outer ring permanent magnet direct-drive structure, eliminating the gearbox and long shaft. Torque is directly electromagnetically coupled to the impeller, eliminating gear efficiency losses and mechanical transmission limitations, making low-speed, high-torque transmission more direct and faster-responding. This is achieved by applying electromagnetic force... The invention utilizes a large arm and a multi-pole permanent magnet motor to generate high torque at low speeds. A hydrodynamic structure then efficiently pushes out a large volume of water with a low head, achieving the goals of high torque, low speed, and high flow rate. Furthermore, with the assistance of a frequency converter's variable frequency vector control, it achieves smooth start-up and low-speed operation, avoiding mechanical vibration and noise. Compared to ordinary water pumps operating at high speeds, this significantly reduces water flow shear force and mechanical noise, minimizing physical stress on aquaculture organisms. Thus, this invention fundamentally solves the two core contradictions of low regulation efficiency and high biological stress in existing technologies, achieving efficient, environmentally friendly, and safe water temperature regulation.

[0017] 2. This invention connects each nozzle to the cylinder via a conduit. With the assistance of an adjusting component, the horizontal and vertical angles can be adjusted by driving the conduit to deflect during the operation of the shaftless pump. This adapts to different pool shapes and temperature control requirements, supporting forward and reverse operation. In winter, it raises the bottom water temperature, and in summer, it promotes the exchange between the upper and lower layers, making the shaftless pump suitable for year-round use in aquaculture farms and achieving optimal temperature field distribution in the aquaculture water. Furthermore, this invention uses a lifting component on the cylinder to adjust the depth of the cylinder in the water, enabling dynamic positioning of the pump at different water layers: in winter, it submerges to extract bottom water and transport it upward to prevent surface freezing; in summer, it adjusts the depth to promote the exchange between the upper and lower layers of water and eliminate localized high temperatures.

[0018] 3. This invention provides a gas-liquid mixing chamber connected to a high-pressure air source at the bottom of the cylinder. During the operation of the shaftless pump, air or pure oxygen is introduced into the gas-liquid mixing chamber through the high-pressure air source. This avoids the shaftless pump drawing water with high bottom temperature but low dissolved oxygen content to the surface in winter, which would directly lead to oxygen deficiency in the aquaculture area and cause a problem of balancing water temperature and dissolved oxygen.

[0019] 4. This invention achieves precise constant temperature management by deploying multiple temperature sensors, multiple oxygen sensors, and a controller connected to each sensor and actuator in an aquaculture pond equipped with the shaftless pump. A three-dimensional temperature sensor array monitors the temperature at different water depths in real time. The controller automatically adjusts the shaftless pump's start / stop, speed, forward / reverse rotation, and nozzle spray direction based on the temperature difference. The entire system is upgraded from water handling to constant temperature air conditioning. Simultaneously, based on dissolved oxygen feedback and in conjunction with a high-pressure air source, it achieves closed-loop constant temperature control without reducing oxygen levels, solving problems such as surface freezing in winter and localized high temperatures in summer. The closed-loop constant temperature control process requires no manual intervention, resulting in a high degree of automation and convenient management. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the usage state structure of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the usage state structure of the present invention. Figure 2 ; Figure 3 This is a schematic diagram of the main structure of the shaftless pump of the present invention; Figure 4 This is a schematic cross-sectional view of the shaftless pump of the present invention; Figure 5 This is a schematic diagram of the shaftless pump rotor section of the present invention; Figure 6 This is a schematic cross-sectional view of the rotor portion of the shaftless pump of the present invention; Figure 7 This is a schematic cross-sectional view of the rotor portion of the shaftless pump of the present invention; Figure 8 This is a schematic diagram of the usage state structure of the present invention. Figure 3 .

[0021] Explanation of reference numerals in the attached figures: 1. Cylinder; 11. Nozzle; 12. Guide tube; 13. Adjustment section; 131. Collar; 132. Support rod; 133. Telescopic component; 14. Gas-liquid mixing chamber; 15. Gas ring; 151. Air guide pipe; 152. Air distribution pipe; 2. Outer ring rotor; 21. Water-lubricated bearing; 3. Stator; 4. Shaftless rotor impeller; 5. Frequency converter; 6. Lifting component; 7. Aquaculture pond; 71. Mounting ring; 8. Temperature sensor. Detailed Implementation

[0022] The accompanying drawings in this invention are not strictly drawn to scale, and the specific dimensions and quantity of each structure can be determined according to actual needs. The drawings described in this invention are merely structural schematic diagrams.

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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, not all, of the embodiments of the present invention. Based on the described 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] Unless otherwise defined, the technical or scientific terms used herein should have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "inner," "outer," "upper," "lower," "far," "near," "front," and "rear" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0025] Existing water temperature regulation schemes involving the exchange of water between upper and lower bodies still face the following technical challenges in practical applications: 1. Current systems mostly employ ordinary water pumps for water lifting operations. However, the lifting capacity of ordinary water pumps is limited per unit time, making it difficult to achieve effective temperature adjustment in large-scale aquaculture areas within a short period. This results in low regulation efficiency and fails to meet the temperature control requirements of large-scale aquaculture. 2. Ordinary water pumps generate significant mechanical vibration and noise during operation. These physical disturbances can easily cause significant stress responses in farmed organisms. Aquaculture research shows that farmed organisms are extremely sensitive to physical stressors such as vibration and noise, which may manifest as decreased feed intake, abnormal behavior, and reduced immunity. In severe cases, it can even lead to stunted growth or increased mortality, directly impacting aquaculture profitability. 3. Ordinary water pumps also have limitations in terms of operational stability, service life, and maintenance costs, making it difficult to meet the needs of long-term stable operation in industrialized aquaculture. Therefore, there is an urgent need to develop a water temperature regulating pump that can ensure effective temperature regulation while improving regulation efficiency and reducing interference with farmed organisms, thereby achieving more efficient, environmentally friendly, and safe water temperature regulation.

[0026] This invention addresses the problems of low temperature regulation efficiency, high vibration and noise, and stress on farmed organisms caused by traditional water pumps in aquaculture. It innovatively adopts an outer ring permanent magnet direct-drive shaftless pump structure. A large-diameter cylinder (0.6m~2.0m) combined with a multi-pole permanent magnet motor (40 poles) achieves low-speed (100r / min~300r / min) high-torque direct drive, eliminating the need for gearboxes and long shaft transmissions, thus reducing mechanical losses and noise. Simultaneously, water-lubricated bearings and submersible water cooling ensure stable underwater operation, while vector frequency conversion control enables smooth start-stop and speed regulation. Furthermore, an adjustable-angle nozzle system and a gas-liquid mixing oxygenation chamber are integrated, along with a three-dimensional temperature sensor array and intelligent controller, to construct an automatic closed-loop constant temperature control system. Ultimately, this achieves a highly efficient and environmentally friendly aquaculture temperature control solution that allows for large-flow water exchange and temperature regulation without oxygen depletion and with low stress interference.

[0027] Combination Figures 1 to 8As shown, the technical solution of the present invention is: a shaftless pump for water temperature regulation, installed in an aquaculture water body, comprising: a cylindrical body 1 arranged longitudinally, with an open bottom end, and multiple nozzles 11 arranged circumferentially on the upper side wall of the cylindrical body 1; the multiple nozzles 11 are evenly distributed circumferentially on the side wall of the cylindrical body 1. An outer ring rotor 2 is annular and rotatably connected inside the cylindrical body 1, and a multi-pole permanent magnet is fixed on the outer circumferential surface of the outer ring rotor 2. A stator 3 is fixedly embedded inside the cylindrical body 1, and the stator 3 is radially opposite to the multi-pole permanent magnet, and the stator 3 has windings; a shaftless rotor impeller 4 is connected to the outer ring rotor 2, and the shaftless rotor impeller 4 is used to rotate under the drive of the outer ring rotor 2 to transport water from the bottom to the top of the cylindrical body 1 and discharge it from the nozzles 11; a frequency converter 5 is electrically connected to the windings of the stator 3, and is used to cooperate with vector control to achieve smooth start-up and speed regulation of the pump body, the vector control including torque control and flux linkage control. This shaftless pump adopts an outer ring permanent magnet direct drive structure, eliminating the gearbox and long shaft. The torque is directly electromagnetically coupled to the impeller, eliminating gear efficiency losses and mechanical transmission limitations. This makes low-speed, high-torque transmission more direct and faster in response. By increasing the electromagnetic force arm and using a multi-pole permanent magnet motor to generate high torque at low speeds, and then using a hydrodynamic structure to efficiently push out a large volume of low-head water, the pump achieves the goals of high torque, low speed, and high flow rate. Furthermore, with the cooperation of frequency converter vector control, it achieves smooth start-up and speed regulation, avoiding mechanical vibration and noise during low-speed operation. Compared with ordinary water pumps operating at high speeds, it significantly reduces water flow shear force and mechanical noise, reducing physical stress on aquaculture organisms. Thus, this invention fundamentally solves the two core contradictions of low regulation efficiency and high biological stress in existing technologies, achieving efficient, environmentally friendly, and safe water temperature regulation.

[0028] In at least one embodiment of the present invention, such as Figures 2 to 4 As shown, multiple nozzles 11 are connected to the cylinder 1 via conduits 12. Each conduit 12 is connected to the cylinder 1 via a hinge, and each conduit 12 is connected to an adjustment unit 13. The adjustment unit 13 is used to drive the conduit 12 to deflect around the hinge, thereby adjusting the spray direction of each nozzle 11. Specifically, the conduit 12 is connected to the cylinder 1 via a corrugated pipe so that the deflection of the conduit 12 does not affect the normal flow of water. The adjustment unit 13 is driven by an electric push rod or a hydraulic push rod. The push rod has a built-in displacement sensor to provide feedback on the real-time angle position of the conduit 12, with a control accuracy of ±1°. Specifically, there are 6 to 8 nozzles 11, divided into two groups, which can be independently adjusted in angle. During winter temperature adjustment, one group of nozzles 11 sprays horizontally to promote the flow of surface water, while the other group of nozzles 11 sprays downward at a 15° angle to guide the bottom warm water to the middle layer. During summer temperature adjustment, the nozzles 11 spray upward to promote the exchange of water between the upper and lower layers. The angle of each nozzle 11 can be adjusted in real time according to the feedback of the temperature sensor 8 to achieve the optimal temperature field distribution; in this embodiment, the nozzle system has multi-angle adjustment capability to adapt to different aquaculture pond shapes and temperature control requirements.

[0029] In at least one embodiment of the present invention, such as Figures 2 to 4 as well as Figure 7 As shown, a gas-liquid mixing chamber 14 is provided in the cylinder 1 near the bottom opening. The gas-liquid mixing chamber 14 is connected to a high-pressure gas source. The high-pressure gas source is used to introduce air or pure oxygen into the gas-liquid mixing chamber 14 to achieve temperature regulation without reducing oxygen content. This avoids the shaftless pump drawing water with high bottom water temperature but low dissolved oxygen content to the surface in winter, which would directly lead to oxygen deficiency in the aquaculture area and cause a problem of water temperature and dissolved oxygen being compromised.

[0030] In at least one embodiment of the present invention, such as Figure 8 As shown, a lifting component 6 is connected to the cylinder 1. The lifting component 6 is fixed to the bottom of the water body. The lifting component 6 is used to control the deployment depth of the cylinder 1 in the aquaculture water body. By linking with the controller, temperature sensor 8 and oxygen sensor signals, the pump body can be dynamically positioned in different water layers: in winter, it submerges to extract warm water from the bottom layer and transports it upward to prevent surface freezing; in summer, it adjusts the depth to promote the exchange of water between the upper and lower layers and eliminate local high temperatures. At the same time, based on dissolved oxygen feedback, it avoids directly pumping low-oxygen water from the bottom layer into the aquaculture area. Thus, in conjunction with frequency conversion speed regulation and nozzle 11 angle adjustment, it forms a three-dimensional temperature field control system to achieve precise and efficient constant temperature closed-loop control that adjusts temperature without reducing oxygen, while also taking into account the convenience of equipment maintenance and the need for disaster avoidance in extreme weather. The lifting component 6 can be a waterproof electric telescopic rod.

[0031] In at least one embodiment of the present invention, the inner diameter of the cylinder 1 is 0.6m to 2.0m, preferably 2m. When the inner diameter is less than 0.6m, the single water lifting capacity cannot meet the temperature regulation requirements of large-area aquaculture ponds; when the inner diameter is greater than 2m, the equipment is too large and inconvenient to install and maintain. The rotational speed of the shaftless rotor impeller 4 is 100r / min to 300r / min. When the rotational speed is less than 100r / min, the water circulation capacity is insufficient and cannot effectively eliminate water temperature stratification; when the rotational speed is greater than 300r / min, the water flow shear force increases significantly, which can easily cause stress to the cultured organisms. The shaftless pump is designed with a head of 0.5m and a flow rate of 15000m³ / h. 3 / h, speed: 150r / min, power 30kW; the number of blades of the shaftless rotor impeller 4 is 4 to 6, preferably 5 to ensure the balance of the device, the number of poles of the multi-pole permanent magnet is 40 (i.e. 20 pairs), the blade tip installation angle of the blades of the shaftless rotor impeller 4 is 10° to 12°, when the blade tip installation angle is greater than 12°, the water flow impact loss increases and the efficiency decreases, when it is less than 10°, the work capacity is insufficient; the blade root installation angle of the blades of the shaftless rotor impeller 4 is 17° to 19°; the above parameter settings are in synergy with the core design goals of the shaftless pump: high torque, low speed, and high flow rate. Specifically, the configuration of 40-pole multi-pole permanent magnets enables the motor to generate high electromagnetic torque even at low speeds (100r / min~300r / min), providing sufficient power for the direct drive of the shaftless rotor impeller 4. The differentiated design of the blade tip installation angle of 10°~12° and the blade root installation angle of 17°~19° takes into account the difference in linear velocity at different radii of the blade. The blade tip has a higher linear velocity, so a smaller installation angle is used to reduce water flow impact loss, while the blade root has a lower linear velocity, so a larger installation angle is used to improve work capacity. This variable angle design allows the large-diameter impeller (corresponding to the inner diameter of the cylinder of 0.6m~2.0m) to maintain high hydraulic performance at low speeds, avoiding the high shear force and cavitation problems generated by traditional water pumps when running at high speeds. The arrangement of 4 to 6 blades (preferably 5) ensures structural dynamic balance while optimizing the flow channel area. Combined with a 2m large-diameter cylinder, it achieves a high flow rate of 15,000 m³ / h and a low head of 0.5m, perfectly meeting the temperature regulation needs of aquaculture characterized by "large water volume and small temperature difference circulation." These parameters completely eliminate the mechanical losses and noise sources of gearboxes and long shaft drives. Through the technical coupling of "large diameter, multiple poles, low speed, and variable angle blades," it achieves efficient transmission of electromagnetic torque to hydraulic performance, achieving energy-saving operation at 30kW power. It also fundamentally eliminates the stress interference of high-speed mechanical vibration and fluid noise on aquaculture organisms, while ensuring high-flow exchange efficiency during temperature regulation.

[0032] In at least one embodiment of the present invention, such as Figures 2 to 4 as well as Figure 7 As shown, an air ring 15 is fitted on the outer side of the gas-liquid mixing chamber 14 on the cylinder 1. The air ring 15 is connected to a high-pressure air source through an air guide pipe 151. The air ring 15 is provided with multiple air distribution pipes 152 that extend into the gas-liquid mixing chamber 14. Each air distribution pipe 152 is horizontally arranged in the gas-liquid mixing chamber 14, and each air distribution pipe 152 has multiple air outlets at its top. The arrangement of each air distribution pipe 152 can ensure that high-pressure air and pure oxygen can be evenly distributed in the water body to ensure the oxygen content of the aquaculture water body.

[0033] In at least one embodiment of the present invention, such as Figure 3As shown, in addition to the above-mentioned scheme of individually controlling the direction adjustment of each nozzle, the adjustment unit 13 of the present invention can also perform the following scheme: the adjustment unit 13 includes a collar 131 fitted on the cylinder 1, multiple support rods 132 and a telescopic member 133. One end of the multiple support rods 132 is hinged to the collar 131, and the other end of the multiple support rods 132 is respectively hinged to multiple guide tubes 12. The two ends of the telescopic member 133 are respectively connected to the collar 131 and the outer wall of the cylinder 1. This scheme further reduces the number of actuators of the device. The nozzle direction adjustment is completed by a waterproof telescopic member 133, which reduces the cost of the device and can be used as an alternative scheme for cost reduction. The outer ring rotor 2 is rotatably connected to the inner wall of the cylinder 1 through a water-lubricated bearing 21. The submersible water cooling and water-lubricated bearing 21 allow the motor and bearing to work in water, using the surrounding water to remove heat, and the water-lubricated bearing 21 avoids the oil system.

[0034] like Figure 2 As shown, this invention also proposes an aquaculture system, including: an aquaculture pond 7, multiple temperature sensors 8, and a controller. A cylindrical body 1 is longitudinally positioned within the water body of the aquaculture pond 7. Multiple temperature sensors 8 are arranged at different water depths within the aquaculture pond 7. Specifically, the multiple temperature sensors 8 form a three-dimensional temperature sensing array. The controller is signal-connected to the multiple temperature sensors 8, a frequency converter 5, and a regulating unit 13. The controller is used to control the start / stop, speed, and forward / reverse rotation of the shaftless pump based on the temperature difference at different water depths via the frequency converter, and to control the spray direction of each nozzle 11 via the regulating unit 13, thereby achieving closed-loop control of the water body's constant temperature. The entire system is upgraded from water handling to a constant-temperature air conditioning system, solving problems such as surface icing in winter and localized high temperatures in summer. Furthermore, the controller uses an industrial-grade PLC (such as Siemens S7-1200 / 1500 or domestic brands like Huichuan and Xinjie), configured with: a CPU module with an integrated Ethernet port supporting Modbus. TCP / IP protocol; Analog input module: acquires sensor signals such as temperature and dissolved oxygen; Analog output module: controls the frequency of the frequency converter; Digital input / output module: receives switch signals and controls actuators such as the regulating unit 13 and the air source valve.

[0035] Specifically, taking the farming of common freshwater fish (such as carp and crucian carp) as an example, their suitable growth water temperature is 15℃~25℃. When the temperature difference between different water layers in the farming pond exceeds 1.5℃~3℃ (preferably 2℃), the shaftless pump is triggered to start and exchange water to regulate temperature. The basis for this threshold setting is that in winter, the surface water temperature easily drops below 10℃ while the bottom layer remains at 12℃~15℃. A 2℃ temperature difference can prevent surface low-temperature stress in time and avoid frequent pump start-stop. In summer, the surface water temperature can reach 28℃~30℃ in the afternoon while the bottom layer is 24℃~26℃. When the 2℃ threshold is reached, the pump is started to promote the exchange between the upper and lower layers, which can effectively eliminate local high-temperature areas. For temperature-sensitive species such as shrimp, the threshold can be tightened to 1.5℃; while for large-scale water bodies (such as those with an inner diameter of 2m cylinders), due to their greater thermal inertia, the threshold can be relaxed to 3℃. The controller compares the data of each depth measurement point in real time through a three-dimensional temperature sensor array. When the temperature difference between any adjacent water layers reaches the set value, or the total temperature difference between the surface and the bottom layer exceeds the threshold, the inverter 5 is driven to start the shaftless pump. The speed is automatically matched according to the size of the temperature difference (100r / min~300r / min range), realizing the intelligent response of "slow adjustment for small temperature differences and fast adjustment for large temperature differences", which ensures the comfort of the aquaculture organisms while taking into account the system energy efficiency.

[0036] In at least one embodiment of the present invention, multiple oxygen sensors are installed in the aquaculture pond 7, and the multiple oxygen sensors, high-pressure gas source, and lifting device 6 are all connected to the controller signal. This embodiment is based on the fact that although the bottom water temperature is high in winter, the dissolved oxygen is often <3mg / L. Directly pumping it up will lead to oxygen deficiency in the aquaculture area, resulting in a problem of not being able to balance water temperature and dissolved oxygen. Furthermore, a fluorescent dissolved oxygen sensor can be installed in the aquaculture area, and the controller can use a built-in temperature-dissolved oxygen multi-objective optimization algorithm to automatically increase the gas volume when the dissolved oxygen is below 5mg / L and decrease it when it is above 7mg / L, so as to achieve temperature adjustment without reducing oxygen.

[0037] Furthermore, the smooth start-up method of the pump body of the present invention is as follows: During startup, the frequency converter 5 adopts a sensorless vector control algorithm, which reconstructs the position and speed information of the outer rotor 2 by real-time detection of the current and voltage signals of the stator 3 winding, and can achieve precise magnetic field orientation control without the need for a mechanical encoder; at the same time, the controller has a built-in torque compensation algorithm, which performs a soft start at a preset low speed (such as 100 r / min) and low torque (30%~50% of the rated torque) at the moment of startup, so that the shaftless rotor impeller 4 can be slowly accelerated from a stationary state, avoiding the mechanical shock and water hammer effect generated when the traditional water pump is started directly at the power frequency; as the speed rises steadily, the frequency converter dynamically adjusts the target speed according to the real-time temperature difference fed back by the temperature sensor 8, and achieves stepless speed regulation in the range of 150 r / min~300 r / min. The torque output is smooth and controllable throughout the process, completely eliminating gearbox meshing vibration and long shaft torsional vibration, and ensuring that the cultured organisms are protected from stress interference from sudden mechanical noise and fluid shear force.

[0038] In at least one embodiment of the present invention, a plurality of water outlet holes are provided above the side wall of the aquaculture pond 7, and a plurality of one-way water outlet valves are provided in each water outlet hole. An installation ring 71 is provided at the top of the side wall of the aquaculture pond 7, and a plurality of one-way water outlet valves are evenly arranged on the installation ring 71. The installation ring 71 is made of polypropylene.

[0039] The novelty and beneficial effects of this invention are as follows: First, it is highly efficient and energy-saving with low operating costs: It adopts an outer ring permanent magnet direct drive structure, eliminating the gearbox and long shaft. The torque is directly electromagnetically coupled to the impeller, eliminating gear efficiency losses and mechanical transmission limitations, making low-speed, high-torque transmission more direct and faster in response. It utilizes the natural thermal stratification characteristics of the lower layer of water in closed water bodies during winter, which is higher than the upper layer, to achieve temperature regulation through water exchange. No additional heat pump heating is required, and energy consumption is significantly reduced. By increasing the electromagnetic force arm and using a multi-pole permanent magnet motor to generate high torque at low speed, and then using a hydrodynamic structure to efficiently push out a large volume of low-head water, the goal of high torque, low speed, and large flow rate is achieved.

[0040] Secondly, it operates smoothly, reducing stress on aquaculture organisms: The shaftless pump structure, combined with vector and torque control technology, enables smooth start-up and speed regulation, avoiding mechanical vibration and noise. Low-speed operation (100r / min~300r / min) significantly reduces water flow shear force and mechanical noise compared to high-speed operation of ordinary water pumps, reducing physical stress on aquaculture organisms. The water-lubricated bearing design avoids oil system contamination, eliminates the risk of oil leakage, and ensures the cleanliness and safety of aquaculture water.

[0041] Third, automatic closed-loop control enables precise constant temperature management. Through a three-dimensional temperature sensor array, the temperature at different water depths is monitored in real time. The controller automatically adjusts the start / stop, speed, forward / reverse rotation, and nozzle spray direction of the shaftless pump according to the temperature difference. The entire system is upgraded from water handling to constant temperature air conditioning, solving pain points such as surface freezing in winter and local high temperature in summer. It achieves constant temperature closed-loop control of the water body. The temperature adjustment process does not require manual intervention, has a high degree of automation, and is easy to manage.

[0042] Fourth, temperature regulation without oxygen depletion ensures healthy growth of aquatic organisms: A gas-liquid mixing chamber is set at the bottom of the cylinder, connected to a high-pressure air source or a pure oxygen source. While raising the temperature of the bottom water, it simultaneously increases oxygen. Through a multi-objective optimization algorithm of temperature and dissolved oxygen, the gas volume is automatically adjusted according to the dissolved oxygen level, avoiding the direct surge of low-oxygen water from the bottom, which would lead to oxygen deficiency in the aquaculture area. This achieves a balance between temperature regulation and dissolved oxygen protection, ensuring the healthy growth of aquatic organisms.

[0043] Fifth, the structure is reliable, maintenance is simple, and it is suitable for long-term operation: The submersible water-cooled and water-lubricated bearing design allows the motor and bearings to work in the water, using the surrounding water to remove heat, eliminating the need for an additional cooling system. It also reduces vulnerable transmission components such as gearboxes and long shafts, lowering maintenance points and failure rates, and extending the service life of the equipment. The main components are made of corrosion-resistant materials such as stainless steel and polypropylene, making it suitable for the harsh water quality environment of aquaculture.

[0044] Sixth, flexible and adaptable to meet the needs of different aquaculture scenarios: the nozzle spray direction is adjustable, and the guide tube is deflected through the adjustment part to achieve horizontal and pitch angle adjustment, adapting to different pond shapes and temperature control needs. It supports forward and reverse operation, increases the bottom water temperature in winter, promotes the exchange between the upper and lower layers in summer, and is applicable all year round.

[0045] The above embodiments are merely specific implementations of the present invention, used to illustrate the technical solutions of the present invention, and not to limit them. The protection scope of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments within the technical scope disclosed in the present invention, or make equivalent substitutions for some of the technical features; and these modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions implemented in the present invention, and should all be covered within the protection scope of the present invention.

Claims

1. A shaftless pump for regulating water temperature, installed in an aquaculture water body, characterized in that, include: The cylinder is arranged longitudinally, with an open bottom end, and multiple nozzles are arranged circumferentially above the side wall of the cylinder; The outer ring rotor is ring-shaped and is rotatably connected to the cylinder. A multi-pole permanent magnet is fixed on the outer circumferential surface of the outer ring rotor. The stator is fixedly embedded in the cylinder, and the stator is radially opposite to the multipole permanent magnet. The stator has windings. A shaftless rotor impeller is disposed inside the outer ring rotor and fixedly connected to the outer ring rotor. The shaftless rotor impeller is used to rotate under the drive of the outer ring rotor to realize the longitudinal transport of water. The frequency converter is electrically connected to the windings of the stator and is used in conjunction with vector control to achieve smooth start-up and speed regulation of the shaftless rotor impeller.

2. The water temperature regulating shaftless pump as described in claim 1, characterized in that, Each of the nozzles is connected to the cylinder via a conduit, and each conduit is connected to the cylinder via a hinge. Each conduit is connected to an adjustment part, which is used to drive the conduit to deflect around the hinge to adjust the jet direction of each nozzle.

3. The water temperature regulating shaftless pump as described in claim 2, characterized in that, The cylinder is provided with a gas-liquid mixing chamber near the bottom opening. The gas-liquid mixing chamber is connected to a high-pressure gas source, which is used to introduce air or pure oxygen into the gas-liquid mixing chamber.

4. A shaftless pump for water temperature regulation as described in claim 3, characterized in that, A lifting device is connected to the cylinder body, and the lifting device is fixed to the bottom of the water body. The lifting device is used to control the deployment depth of the cylinder body in the aquaculture water body.

5. A shaftless pump for regulating water temperature as described in claim 1, characterized in that, The inner diameter of the cylinder is 0.6m to 2.0m, and the rotational speed of the shaftless rotor impeller is 100r / min to 300r / min.

6. A shaftless pump for regulating water temperature as described in claim 1, characterized in that, The number of shaftless rotor impellers is 4 to 6, the blade tip installation angle of each shaftless rotor impeller blade is 10° to 12°, and the blade root installation angle of each shaftless rotor impeller blade is 17° to 19°.

7. A shaftless pump for water temperature regulation as described in claim 3, characterized in that, An air ring is fitted on the outside of the gas-liquid mixing chamber on the cylinder. The air ring is connected to a high-pressure gas source through an air guide pipe. The air ring is provided with multiple air distribution pipes that extend into the gas-liquid mixing chamber. Each air distribution pipe is horizontally arranged in the gas-liquid mixing chamber, and each air distribution pipe has multiple air outlet holes at its top.

8. A shaftless pump for regulating water temperature as described in claim 2, characterized in that, The adjusting part includes a collar fitted on the cylinder, multiple support rods and a telescopic component. One end of each of the multiple support rods is hinged to the collar, and the other end of each of the multiple support rods is respectively hinged to the multiple guide tubes. The two ends of the telescopic component are respectively connected to the collar and the outer wall of the cylinder. The outer ring rotor is rotatably connected to the inner wall of the cylinder through a water-lubricated bearing.

9. An aquaculture system, based on the water temperature regulating shaftless pump as described in claim 1, characterized in that, include: Aquaculture pond; the cylindrical body is longitudinally arranged within the water body of the aquaculture pond; Multiple temperature sensors are deployed at different water depths within the aquaculture pond; The controller is connected to multiple temperature sensors and a frequency converter. The controller is used to receive temperature information monitored by multiple temperature sensors and control the start, stop, speed and forward and reverse rotation of the water temperature regulating shaftless pump according to the temperature information via the frequency converter.

10. An aquaculture system as described in claim 9, characterized in that, The aquaculture pond is equipped with multiple oxygen sensors, which are connected to the controller via signal transmission.

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