Industrial circulating pump based on frequency conversion self-adaption

Abstract

The invention relates to the technical field, in particular to an industrial circulating pump based on frequency conversion self-adaption. Comprising an impeller shell, a rotating shaft vertically and rotatably mounted in the impeller shell, an impeller concentrically mounted on the rotating shaft, a motor shell mounted on the impeller shell and covering the impeller, a plurality of permanent magnet acceleration devices mounted on the shaft surface of the rotating shaft, and a driving motor mounted in the motor shell, wherein the output end of the driving motor is concentrically and fixedly connected to the rotating shaft; a plurality of driving magnets used for driving the permanent magnet acceleration device to accelerate the rotation of the rotating shaft are installed in the motor shell, the driving magnets are arranged in the motor shell in an annular array mode with the circle center of the rotating shaft as the base point, and through the arrangement of the permanent magnet acceleration device, the purpose that the rotating speed of the rotating shaft can be increased according to the water consumption without electric power is achieved.

Description

Technical Field

[0001] This application relates to the technical field of circulation pumps, and in particular to an industrial circulation pump based on frequency conversion and self - adaptation. Background Art

[0002] A circulation pump is a power device used to transport the circulating liquid for reaction, absorption, separation, and absorption liquid regeneration in a device. The circulation pump creates a pressure difference between the inlet and outlet by the rotation of the impeller, circulating the water. Under the external atmospheric pressure, the low water level pushes the inlet valve, and the water enters the pump casing along the inlet pipe and is thrown into the outlet pipe by the impeller, enabling the water at the lower part to be continuously pumped to the upper part.

[0003] In the existing frequency - conversion self - adaptive circulation pumps, the impeller speed of the industrial circulation pump is usually adjusted by using a flow sensor and a frequency converter. For example, when the water consumption increases, resulting in an increase in the water flow velocity and a decrease in the pipeline pressure, the flow sensor detects this change, and the control system will instruct the frequency converter to increase the motor speed, causing the impeller to rotate faster, increasing the water flow and pressure to meet the water demand; conversely, when the water consumption decreases, the water flow velocity slows down, and the pipeline pressure increases, the control system will instruct the frequency converter to decrease the motor speed, reducing the rotation speed of the impeller, reducing the water flow and pressure, and avoiding energy waste and damage to the pipeline caused by excessive water pressure. However, the existing frequency - conversion circulation pumps still have some limitations. Due to the certain energy loss of the frequency converter itself, its efficiency will significantly decrease during low - load operation, affecting the energy - saving effect of the overall system. For this reason, this application proposes an industrial circulation pump based on frequency conversion and self - adaptation, achieving the purpose of increasing the rotation speed of the rotating shaft according to the water consumption without electricity. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the purpose of this application is to provide an industrial circulation pump based on frequency conversion and self - adaptation, which realizes the purpose of adjusting the rotation speed of the rotating shaft in real - time according to the change of water consumption without electricity.

[0005] The above - mentioned purpose of this application is achieved through the following technical solutions: An industrial circulation pump based on frequency conversion and self - adaptation includes an impeller housing, a rotating shaft vertically and rotatably installed inside the impeller housing, an impeller concentrically installed on the rotating shaft, a motor housing installed on the impeller housing to cover the impeller, a plurality of permanent - magnet acceleration devices installed on the axial surface of the rotating shaft, and a driving motor installed inside the motor housing and concentrically and fixedly connected to the rotating shaft at the output end. A plurality of driving magnets for driving the permanent - magnet acceleration devices to accelerate the rotation of the rotating shaft are installed inside the motor housing, and the plurality of driving magnets are arranged in a circular array with the center of the rotating shaft as the base point inside the motor housing.

[0006] Furthermore, the permanent magnet acceleration device includes a plurality of convex plates fixedly arranged on the rotating shaft in a circular array with the center of the rotating shaft as the base point, a swing arm with one end abutted against the upper surface of the convex plate, a permanent magnet fixedly arranged at the other end of the swing arm, and a rotating shaft that passes through the swing arm from the upper surface of the convex plate and is rotatably connected to the convex plate. The swing arm is rotatably connected to the rotating shaft, and the magnetic poles of the driving magnet and the permanent magnet are 90 degrees out of phase.

[0007] By adopting the above technical solution, when the impeller is not accelerating, the swing arm of the permanent magnet acceleration device is connected to the convex plate through the rotating shaft and is in an initial folded state. The magnetic field acting force between the permanent magnet and the driving magnet is small. When the water consumption increases, the water flow velocity in the pipeline speeds up, generating a greater driving force on the impeller. Since the impeller is concentrically installed with the rotating shaft, the impeller starts to accelerate and rotate under the greater hydraulic action, and the rotating shaft accelerates synchronously. As the rotating speed of the rotating shaft increases, the convex plate rotates at a high speed with the rotating shaft. The swing arm installed on the convex plate starts to unfold outward due to the centrifugal force. The swing arm rotates around the rotating shaft, and the permanent magnet at its other end gradually moves away from the rotating shaft and approaches the driving magnet. This process changes the relative position between the permanent magnet and the driving magnet, significantly enhancing the magnetic field acting force between the two. The permanent magnet forms a 90-degree magnetic pole phase difference with the driving magnet after the swing arm unfolds. This enables the magnetic field generated by the driving magnet to interact with the magnetic field of the permanent magnet to form a rotating magnetic field. The rotating magnetic field exerts a tangential force on the permanent magnet, and the torque is transmitted to the rotating shaft through the rotating shaft and the convex plate. This process realizes the acceleration drive of the rotating shaft by the driving magnet through the permanent magnet. The faster the rotating speed of the rotating shaft, the greater the centrifugal force, the higher the degree of unfolding of the swing arm, the stronger the magnetic field acting force between the permanent magnet and the driving magnet, and the greater the acceleration torque obtained by the rotating shaft. Thus, the purpose of increasing the rotating speed of the rotating shaft according to the water consumption without electricity is achieved.

[0008] Furthermore, an annular storage groove is formed inside the motor housing, and a reset device for resetting the permanent magnet acceleration device is arranged inside the annular storage groove.

[0009] Further, the reset device includes an auxiliary ring located inside the annular receiving groove, a reset spring disposed on the top surface of the annular receiving groove for pushing the auxiliary ring to move downward along the annular receiving groove, a connecting rod having one end rotatably connected to the end of the swing arm away from the convex plate, a first connecting piece abutted against the upper surface of the end of the connecting rod away from the swing arm and rotatably connected to the connecting rod, a first mounting groove vertically penetrating through the first connecting piece, a support rod having one end located in the first mounting groove and rotatably connected to the first connecting piece, a second connecting piece disposed at the end of the support rod away from the first connecting piece, a second mounting groove vertically penetrating through the second connecting piece, and a mounting rod having one end abutted against the upper surface of the second connecting piece and rotatably connected to the second connecting piece. The other end of the mounting rod is fixedly connected to the auxiliary ring. The end of the support rod away from the first connecting piece is located in the second mounting groove and rotatably connected to the second connecting piece. The horizontal heights of both the auxiliary ring and the mounting rod are higher than that of the connecting rod.

[0010] By adopting the above technical solution, although the permanent magnet acceleration device achieves the purpose of increasing the rotation speed of the rotating shaft according to the water consumption without electricity, when the water consumption decreases, the water flow velocity in the pipeline decreases, and after the driving force on the impeller decreases, the rotating magnetic field will still continue to apply a tangential force to the permanent magnet. This may result in the swing arm being unable to retract, causing the impeller to be unable to decelerate and reduce the water flow rate and pressure, leading to too high water pressure that may damage the pipeline. The setting of the reset device solves this technical problem. When the impeller is not accelerating or is operating stably and normally with a relatively low rotation speed, the reset spring is in a natural extended state. At this time, the swing arm is in an initial folded state, the connecting rod is in a folded state, and the support rod is in an inclined state. When the impeller rotates at an accelerated speed, the swing arm rotates around the rotating shaft, and the permanent magnet at its other end gradually moves away from the rotating shaft and approaches the driving magnet. During this process, the connecting rod rotates along with the swing arm. Under the action of centrifugal force, the connecting rod rotates around the connection point rotatably connected to the swing arm, making the connecting rod in an extended state, and the end away from the swing arm extends to directly below the second connecting piece. At this time, the support rod is driven by the connecting rod to move to directly below the second connecting piece and rotates around the connection point rotatably connected to the second connecting piece, making the support rod in a vertical state. At this time, the vertically arranged support rod pushes the auxiliary ring to rise and compress the reset spring through the second connecting piece and the mounting rod. When the water consumption decreases, the flow velocity of the water in the pipeline decreases, and the driving force on the impeller decreases. Since the impeller is concentrically installed with the rotating shaft, the rotational speeds of the impeller and the rotating shaft decrease accordingly. The decrease in the rotational speed of the rotating shaft reduces the centrifugal force of the convex plate rotating with the rotating shaft. In the case of the reduced centrifugal force, the return spring pushes the auxiliary ring downward, and the auxiliary ring moves downward along the annular receiving groove. The downward movement of the auxiliary ring drives the mounting rod to move downward, and the mounting rod drives the second connecting piece to move downward. Since both ends of the support rod are rotatably connected to the first connecting piece and the second connecting piece respectively, and the first connecting piece is rotatably connected to the connecting rod, and the connecting rod is rotatably connected to the swing arm, this multi-stage linkage mechanical structure causes the second connecting piece to move downward, and it will push the connecting rod to fold through the support rod and the first connecting piece, thereby driving the swing arm to rotate around the rotating shaft, making the swing arm gradually retract into a folded state, completing the reset of the swing arm; As the swing arm gradually retracts, the permanent magnet at the other end of the swing arm gradually moves away from the driving magnet, changing the relative position between the permanent magnet and the driving magnet, and significantly weakening the magnetic field force between the two. Due to the weakening of the magnetic field force between the driving magnet and the permanent magnet, the accelerating torque applied by the driving magnet to the rotating shaft through the permanent magnet decreases. At the same time, after the rotational speed of the rotating shaft decreases, the driving force of the water flow on the impeller is not sufficient to maintain the previous rotational speed. Under the action of the resistance of the impeller, the rotational speed of the rotating shaft will further decrease until a new equilibrium state is reached, which matches the current lower water consumption, thereby preventing the rotating magnetic field from continuing to apply a tangential force to the permanent magnet, resulting in the inability of the swing arm to retract, the inability of the impeller to decelerate and reduce the water flow rate and pressure, and the situation of excessive water pressure causing damage to the pipeline, and enabling the circulating pump to adjust the rotational speed of the rotating shaft in real time according to the change in water consumption to ensure the efficient and stable operation of the circulating pump.

[0011] Furthermore, a plurality of the return springs are provided.

[0012] By adopting the above technical solution, the plurality of return springs can provide sufficient downward pressure for the auxiliary ring to ensure the reset of the swing arm.

[0013] Furthermore, serrated convex blocks are fixedly provided at the edge of the impeller.

[0014] By adopting the above technical solution, the serrated convex blocks can change the fluid flow direction and velocity distribution, optimize the energy transfer between the fluid and the blades, and the serrated structure can reduce the separation phenomenon of the fluid on the blade surface and improve the kinetic energy conversion efficiency of the fluid.

[0015] Furthermore, the rotating shaft includes an upper connecting shaft for connecting the output end of the driving motor and a lower connecting shaft for connecting the impeller, and a conical acceleration structure for further accelerating the rotation of the rotating shaft is provided between the lower connecting shaft and the upper connecting shaft.

[0016] Further, the conical acceleration structure includes a conical hollow tube located between the lower connecting shaft and the upper connecting shaft and fixedly connected to the lower connecting shaft and the upper connecting shaft at both ends, a spiral groove opened on the inner wall of the conical hollow tube along the height direction of the conical hollow tube, and a plurality of counterweight balls placed inside the spiral groove. The conical hollow tube is arranged upward with a gradually increasing diameter from small to large.

[0017] By adopting the above technical solution, when the rotating shaft starts to rotate initially, the counterweight balls are located at the bottom of the spiral groove. At this time, the conical acceleration structure has not yet produced a significant acceleration effect. When the water consumption increases, the water flow pushes the impeller to accelerate rotation, driving the lower connecting shaft to rotate synchronously. Since the lower connecting shaft and the upper connecting shaft are fixedly connected by the conical hollow tube, the entire rotating shaft begins to rotate as a whole at an accelerated speed. The counterweight balls gradually move upward along the spiral groove as the entire rotating shaft accelerates until they reach the top of the spiral groove. During this process, their momentum is transmitted to the upper connecting shaft through the conical hollow tube. Since the upper connecting shaft is connected to the output end of the drive motor, this momentum transmission will further accelerate the rotation of the upper connecting shaft, thereby driving the entire rotating shaft to accelerate, enabling the rotating shaft to rotate at an accelerated speed further to improve the drainage effect of the impeller; When the water consumption decreases, the water flow velocity in the pipeline decreases, the driving force on the impeller decreases, and when the centrifugal force is not sufficient to support the counterweight balls, the counterweight balls will automatically roll downward along the spiral groove due to gravity until they reach the bottom of the spiral groove; Moreover, the conical acceleration structure can further accelerate the rotating shaft through centrifugal force in cooperation with the permanent magnet acceleration device; the two work together, enabling the rotating shaft to obtain a greater acceleration torque when the water consumption increases, thereby quickly increasing the rotational speed; When the water consumption decreases, the rotational speeds of the impeller and the rotating shaft decrease, the centrifugal force on the counterweight balls decreases, and they will move downward along the spiral groove, weakening the acceleration effect on the upper connecting shaft. At the same time, the swing arm of the permanent magnet acceleration device will also retract under the action of the return spring, weakening the magnetic field force. The combined action of these two mechanisms enables the rotational speed of the rotating shaft to be adjusted more accurately in real time according to the change in water consumption.

[0018] Further, a conical baffle for blocking the spiral groove is fixedly arranged inside the conical tube.

[0019] By adopting the above technical solution, it is prevented that the counterweight balls are thrown out when the rotating shaft rotates.

[0020] Further, the drive motor is a permanent magnet synchronous motor.

[0021] By adopting the above technical solution, when the permanent magnet synchronous motor is in the starting state, the output end can be freely accelerated, so that the drive motor does not prevent the rotating shaft from accelerating rotation and can also provide driving force for the rotating shaft.

[0022] In summary, the present application includes at least one of the following beneficial technical effects: 1. Through the setting of the permanent magnet acceleration device, when the water consumption increases, the swing arm unfolds, causing the permanent magnet to approach the drive magnet, significantly enhancing the magnetic field force between the two. At the same time, after the swing arm unfolds, the permanent magnet forms a 90-degree magnetic pole phase difference with the drive magnet, enabling the magnetic field generated by the drive magnet to interact with the magnetic field of the permanent magnet to form a rotating magnetic field. The rotating magnetic field exerts a tangential force on the permanent magnet, and the torque is transmitted to the rotating shaft through the rotating shaft and the convex plate. This process realizes the acceleration drive of the rotating shaft by the drive magnet through the permanent magnet. The faster the rotating shaft rotates, the greater the centrifugal force, the higher the degree of unfolding of the swing arm, the stronger the magnetic field force between the permanent magnet and the drive magnet, and the greater the acceleration torque obtained by the rotating shaft, thus achieving the purpose of increasing the speed of the rotating shaft according to the water consumption without electricity.

[0023] 2. Through the setting of the reset device, when the water consumption decreases, the swing arm can be reset. As the swing arm gradually retracts, the magnetic field force between the permanent magnet and the drive magnet is significantly weakened. Due to the weakening of the magnetic field force between the drive magnet and the permanent magnet, the acceleration torque exerted by the drive magnet on the rotating shaft through the permanent magnet decreases. At the same time, after the rotating shaft speed drops, the driving force of the water flow on the impeller is not sufficient to maintain the previous speed. Under the action of the impeller resistance, the rotating shaft speed will further decrease until a new equilibrium state is reached, which matches the current lower water consumption, enabling the circulation pump to adjust the rotating shaft speed in real time according to the water consumption change to ensure the efficient and stable operation of the circulation pump. Description of the Drawings

[0024] Figure 1 is the overall structural schematic diagram of the embodiment; Figure 2 is the structure diagram with the Figure 1 drive motor hidden; Figure 3 is Figure 2 the enlarged view of part A in Figure 4 is the cross-sectional view along the Figure 2 A-A line in Figure 5 is the structure diagram with the Figure 4 conical baffle hidden; Figure 6 is Figure 4 another structural view.

[0025] Reference numerals: 1, impeller housing; 10, impeller; 11, motor housing; 12, drive motor; 13, drive magnet; 14, annular receiving groove; 15, raised block; 2, upper connecting shaft; 20, lower connecting shaft; 3, permanent magnet acceleration device; 30, raised plate; 31, swing arm; 32, permanent magnet; 33, rotating shaft; 4, reset device; 40, auxiliary ring; 41, reset spring; 42, connecting rod; 43, first connecting piece; 44, support rod; 45, second connecting piece; 46, mounting rod; 5, conical acceleration structure; 50, conical hollow tube; 51, spiral groove; 52, counterweight ball; 53, conical baffle. Detailed implementation manners

[0026] The present application will be further described in detail below with reference to the accompanying drawings.

[0027] Example, refer to Figure 1 、 Figure 2 、 Figure 3, An industrial circulating pump based on variable-frequency adaptability, comprising an impeller housing 1, a rotating shaft vertically rotatably installed inside the impeller housing 1, an impeller 10 concentrically installed on the rotating shaft, a motor housing 11 installed on the impeller housing 1 to cover the impeller 10, a plurality of permanent magnet acceleration devices 3 installed on the axial surface of the rotating shaft, and a driving motor 12 installed inside the motor housing 11 and having its output end concentrically and fixedly connected to the rotating shaft. A plurality of driving magnets 13 for driving the permanent magnet acceleration device 3 to accelerate the rotation of the rotating shaft are installed inside the motor housing 11. The plurality of driving magnets 13 are arranged in a circular array with the center of the rotating shaft as the base point inside the motor housing 11. The permanent magnet acceleration device 3 includes a plurality of raised plates 30 fixedly arranged on the rotating shaft in a circular array with the center of the rotating shaft as the base point, a swing arm 31 with one end abutted against the upper surface of the raised plate 30, a permanent magnet 32 fixedly arranged at the other end of the swing arm 31, and a rotating shaft 33 passing through the swing arm 31 from the upper surface of the raised plate 30 and rotatably connected to the raised plate 30. The swing arm 31 is rotatably connected to the rotating shaft 33. The magnetic poles of the driving magnet 13 and the permanent magnet 32 are offset by 90 degrees. Among them, a serrated raised block 15 is fixedly provided at the edge of the impeller 10. The serrated raised block 15 can change the fluid flow direction and velocity distribution, optimize the energy transfer between the fluid and the blades, the serrated structure can reduce the separation phenomenon of the fluid on the blade surface, and improve the kinetic energy conversion efficiency of the fluid. Among them, the driving motor 12 should adopt a permanent magnet synchronous motor. When the permanent magnet synchronous motor is in the starting state, the output end can be freely accelerated (the specific principle is that the rotating magnetic potential of the stator aligns with the magnetic potential of the permanent magnet of the rotor and rotates synchronously with the rotor. The rotor is only affected by the radial force, and the torque is zero and no torque is generated. At this time, if an external force is applied to accelerate the rotation on the shaft, due to the lack of the hindrance of the electromagnetic torque, the output end can be freely accelerated), so that the driving motor 12 will not prevent the acceleration of the rotating shaft and can also provide a driving force for the rotating shaft. Regarding the impeller 10, it can be installed on the rotating shaft by means of threads, bonding, magnetic attraction or welding. Regarding the motor housing 11, it can be installed on the impeller housing 1 by means of bolts or buckles; When the impeller 10 is not accelerating, the swing arm 31 of the permanent magnet acceleration device 3 is connected to the convex plate 30 through the rotating shaft 33 and is in the initial folded state. The magnetic field force between the permanent magnet 32 and the driving magnet 13 is small. When the water consumption increases, the water flow velocity in the pipeline accelerates, generating a greater driving force on the impeller 10. Since the impeller 10 is concentrically installed with the rotating shaft, the impeller 10 starts to rotate at an accelerated speed under the greater hydraulic action, and the rotating shaft synchronously accelerates. As the rotating speed of the rotating shaft increases, the convex plate 30 rotates at a high speed with the rotating shaft. The swing arm 31 installed on the convex plate 30 starts to expand outwards due to the centrifugal force (expanding outwards with the rotating shaft 33 as the center). The swing arm 31 rotates around the rotating shaft 33, and the permanent magnet 32 at its other end gradually moves away from the rotating shaft and approaches the driving magnet 13. This process changes the relative position between the permanent magnet 32 and the driving magnet 13, significantly enhancing the magnetic field force between the two. After the swing arm 31 expands, the permanent magnet 32 forms a 90-degree magnetic pole phase difference with the driving magnet 13. This enables the magnetic field generated by the driving magnet 13 to interact with the magnetic field of the permanent magnet 32, forming a rotating magnetic field. The rotating magnetic field exerts a tangential force on the permanent magnet 32, and the torque is transmitted to the rotating shaft through the rotating shaft 33 and the convex plate 30. This process realizes the accelerated driving of the rotating shaft by the driving magnet 13 through the permanent magnet 32. The faster the rotating speed of the rotating shaft, the greater the centrifugal force, the higher the degree of expansion of the swing arm 31, the stronger the magnetic field force between the permanent magnet 32 and the driving magnet 13, and the greater the accelerating torque obtained by the rotating shaft. Thus, the purpose of increasing the rotating speed of the rotating shaft according to the water consumption without electricity is achieved.

[0028] Although the setting of the permanent magnet acceleration device 3 achieves the purpose of increasing the rotation speed of the rotating shaft according to the water consumption without electricity, when the water consumption decreases, the water flow velocity in the pipeline decreases, and after the driving force on the impeller 10 decreases, the rotating magnetic field will still continue to apply a tangential force to the permanent magnet 32. This may cause the swing arm 31 to be unable to retract, resulting in the impeller 10 being unable to decelerate to reduce the water flow rate and pressure, leading to too high water pressure that may damage the pipeline. To solve this technical problem, in this embodiment, an annular storage groove 14 is opened inside the motor housing 11, and a reset device 4 for resetting the permanent magnet acceleration device 3 is provided inside the annular storage groove 14. The reset device 4 includes an auxiliary ring 40 located inside the annular storage groove 14, a reset spring 41 provided on the top surface of the annular storage groove 14 for pushing the auxiliary ring 40 to move downward along the annular storage groove 14, a connecting rod 42 with one end rotatably connected to the end of the swing arm 31 away from the convex plate 30, a first connecting piece 43 abutting against the upper surface of the end of the connecting rod 42 away from the swing arm 31 and rotatably connected to the connecting rod 42, a first installation groove penetrating through the first connecting piece 43 from top to bottom, a support rod 44 with one end located in the first installation groove and rotatably connected to the first connecting piece 43, a second connecting piece 45 provided at the end of the support rod 44 away from the first connecting piece 43, a second installation groove penetrating through the second connecting piece 45 from top to bottom, and a mounting rod 46 with one end abutting against the upper surface of the second connecting piece 45 and rotatably connected to the second connecting piece 45. The other end of the mounting rod 46 is fixedly connected to the auxiliary ring 40. The end of the support rod 44 away from the first connecting piece 43 is located in the second installation groove and rotatably connected to the second connecting piece 45. The horizontal heights of the auxiliary ring 40 and the mounting rod 46 are both higher than that of the connecting rod 42. Among them, multiple reset springs 41 are provided (the specific configuration quantity is the same as that of the auxiliary ring 40, and at least 2 - 4 are arranged at equal intervals), which can provide sufficient downward pressure for the auxiliary ring 40 to ensure the reset of the swing arm 31, and both ends of the reset spring 41 can be respectively fixedly connected to the inner wall of the annular storage groove 14 and the auxiliary ring 40, or one end is fixedly connected to the auxiliary ring 40 and the other end abuts against the inner wall of the annular storage groove 14; When the impeller 10 is not accelerating or running stably and normally and the rotation speed is relatively low, the reset spring 41 is in a natural extended state. At this time, the swing arm 31 is in an initial folded state, the connecting rod 42 is in a folded state, and the support rod 44 is in an inclined state; When the impeller 10 rotates at an accelerated speed, the swing arm 31 rotates around the rotating shaft 33, and the permanent magnet 32 at its other end gradually moves away from the rotating shaft and approaches the driving magnet 13. During this process, as the swing arm 31 rotates, the connecting rod 42 rotates around the connection point rotatably connected to the swing arm 31 under the action of centrifugal force, causing the connecting rod 42 to be in an extended state, and the end of the connecting rod 42 away from the swing arm 31 extends to directly below the second connecting piece 45. At this time, the support rod 44 is driven by the connecting rod 42 to move to directly below the second connecting piece 45 and rotates around the connection point rotatably connected to the second connecting piece 45, making the support rod 44 vertical. At this time, the vertical support rod 44 pushes the auxiliary ring 40 to rise through the second connecting piece 45 and the mounting rod 46 to compress the return spring 41; When the water consumption decreases, the water flow velocity in the pipeline decreases, and the driving force on the impeller 10 decreases. Since the impeller 10 is concentrically installed with the rotating shaft, the rotational speeds of the impeller 10 and the rotating shaft decrease accordingly. The decrease in the rotational speed of the rotating shaft reduces the centrifugal force of the convex plate 30 rotating with the rotating shaft. In the case of the reduced centrifugal force, the return spring 41 begins to take effect. The return spring 41 pushes the auxiliary ring 40 downward, and the auxiliary ring 40 moves downward along the annular storage groove 14. The downward movement of the auxiliary ring 40 drives the mounting rod 46 to move downward, and the mounting rod 46 drives the second connecting piece 45 to move downward. Since the two ends of the support rod 44 are respectively rotatably connected to the first connecting piece 43 and the second connecting piece 45, and the first connecting piece 43 is rotatably connected to the connecting rod 42, and the connecting rod 42 is also rotatably connected to the swing arm 31, this multi-stage linkage mechanical structure causes the second connecting piece 45 to push the connecting rod 42 to fold through the support rod 44 and the first connecting piece 43 when the second connecting piece 45 moves downward, and then drives the swing arm 31 to rotate around the rotating shaft 33, making the swing arm 31 gradually retract into a folded state, completing the reset of the swing arm 31; As the swing arm 31 gradually retracts, the permanent magnet 32 at the other end of the swing arm 31 gradually moves away from the driving magnet 13, changing the relative position between the permanent magnet 32 and the driving magnet 13, resulting in a significant weakening of the magnetic field force between the two. Due to the weakening of the magnetic field force between the driving magnet 13 and the permanent magnet 32, the accelerating torque exerted by the driving magnet 13 on the rotating shaft through the permanent magnet 32 decreases. At the same time, after the rotational speed of the rotating shaft decreases, the driving force of the water flow on the impeller 10 is not sufficient to maintain the previous rotational speed. Under the action of the resistance of the impeller 10, the rotational speed of the rotating shaft will further decrease until a new equilibrium state is reached, which matches the current lower water consumption, thereby preventing the rotating magnetic field from continuing to exert a tangential force on the permanent magnet 32, causing the swing arm 31 to be unable to retract, resulting in the inability of the impeller 10 to decelerate and reduce the water flow and pressure, leading to the situation of excessive water pressure damaging the pipeline, and enabling the circulating pump to adjust the rotational speed of the rotating shaft in real time according to the change in water consumption to ensure the efficient and stable operation of the circulating pump.

[0029] Refer to Figure 4 、 Figure 5and Figure 6 In this embodiment, the rotating shaft includes an upper connecting shaft 2 for connecting the output end of the driving motor 12 and a lower connecting shaft 20 for connecting the impeller 10. A conical acceleration structure 5 for further accelerating the rotation of the rotating shaft is provided between the lower connecting shaft 20 and the upper connecting shaft 2. The conical acceleration structure 5 includes a conical hollow tube 50 located between the lower connecting shaft 20 and the upper connecting shaft 2 and fixedly connected to the lower connecting shaft 20 and the upper connecting shaft 2 at both ends, a spiral groove 51 opened on the inner wall of the conical hollow tube 50 along the height direction of the conical hollow tube 50, and a plurality of counterweight balls 52 placed inside the spiral groove 51. The conical hollow tube 50 is arranged upward from small to large. A conical baffle 53 for blocking the spiral groove 51 is fixedly arranged inside the conical tube to prevent the counterweight balls 52 from being thrown out when the rotating shaft rotates. Regarding the conical hollow tube 50, it can be fixedly connected to the lower connecting shaft 20 and the upper connecting shaft 2 by welding, magnetic attraction or bonding. Regarding the counterweight balls 52, they can be solid iron balls, steel solid balls or ceramic solid balls; When the rotating shaft starts to rotate initially, the counterweight balls 52 are located at the bottom of the spiral groove 51 (the end close to the lower connecting shaft 20). At this time, the conical acceleration structure 5 has not produced a significant acceleration effect. When the water consumption increases, the water flow pushes the impeller 10 to rotate at an accelerated speed, driving the lower connecting shaft 20 to rotate synchronously. Since the lower connecting shaft 20 and the upper connecting shaft 2 are fixedly connected by the conical hollow tube 50, the entire rotating shaft (including the lower connecting shaft 20, the conical acceleration structure 5 and the upper connecting shaft 2) starts to rotate at an accelerated speed as a whole. The counterweight balls 52 gradually move upward along the spiral groove 51 (move towards the wider end of the conical hollow tube 50) as the entire rotating shaft rotates at an accelerated speed until they move to the top of the spiral groove 51. During this process, their momentum is transmitted to the upper connecting shaft 2 through the conical hollow tube 50. Since the upper connecting shaft 2 is connected to the output end of the driving motor 12, this momentum transmission will further accelerate the rotation of the upper connecting shaft 2, thereby driving the entire rotating shaft to accelerate, so that the rotating shaft rotates at an accelerated speed further to improve the drainage effect of the impeller 10; When the water consumption decreases, the water flow velocity in the pipeline decreases, the driving force on the impeller 10 decreases, and its centrifugal force is not sufficient to support the counterweight balls 52, the counterweight balls 52 will automatically roll downward along the spiral groove 51 due to gravity until they move to the bottom of the spiral groove 51; And the conical acceleration structure 5 can further accelerate the rotating shaft by centrifugal force in cooperation with the permanent magnet acceleration device 3; the two work together, so that the rotating shaft can obtain a greater acceleration torque when the water consumption increases, thereby quickly increasing the rotation speed; When the water consumption decreases, the rotational speeds of the impeller 10 and the rotating shaft decrease, the centrifugal force acting on the counterweight ball 52 decreases, and the counterweight ball 52 moves downward along the spiral groove 51 (towards the narrower end of the conical hollow tube 50), weakening the accelerating effect on the upper connecting shaft 2. At the same time, the swing arm 31 of the permanent magnet accelerating device 3 also retracts under the action of the return spring 41, weakening the magnetic field force. The combined action of these two mechanisms enables the rotational speed of the rotating shaft to be adjusted more accurately in real time according to the change in water consumption.

[0030] Specific implementation process: When the impeller 10 is not accelerating, the swing arm 31 is in the initial folded state, the connecting rod 42 is in the folded state, the support rod 44 is in the inclined state, and the counterweight ball 52 is located at the bottom of the spiral groove 51 (the end close to the lower connecting shaft 20); When the water consumption increases, the water flow velocity in the pipeline increases, generating a greater driving force on the impeller 10. The impeller 10 starts to accelerate and rotate under the greater hydraulic action, and the rotating shaft synchronously accelerates. As the rotational speed of the rotating shaft increases, the convex plate 30 rotates at a high speed with the rotating shaft, and the swing arm 31 mounted on the convex plate 30 starts to unfold due to the centrifugal force. During this process, the connecting rod 42 rotates along with the swing arm 31. The connecting rod 42 rotates around the connection point rotatably connected to the swing arm 31 under the action of the centrifugal force, making the connecting rod 42 in the extended state, and the end of the connecting rod 42 away from the swing arm 31 extends to directly below the second connecting piece 45. At this time, the support rod 44 is driven by the connecting rod 42 to move to directly below the second connecting piece 45 and rotates around the connection point rotatably connected to the second connecting piece 45, making the support rod 44 in the vertical state. At this time, the vertically arranged support rod 44 pushes the auxiliary ring 40 to rise and compress the return spring 41 through the second connecting piece 45 and the mounting rod 46. At the same time, the counterweight ball 52 moves along the spiral groove 51 to the top of the spiral groove 51 as the entire rotating shaft accelerates and rotates; The unfolded swing arm 31 brings the permanent magnet 32 closer to the driving magnet 13, significantly enhancing the magnetic field force between the two. After the swing arm 31 unfolds, the permanent magnet 32 forms a 90-degree magnetic pole phase difference with the driving magnet 13. The magnetic field generated by the driving magnet 13 interacts with the magnetic field of the permanent magnet 32 to form a rotating magnetic field. The rotating magnetic field exerts a tangential force on the permanent magnet 32, and the torque is transmitted to the rotating shaft through the rotating shaft 33 and the convex plate 30. This enables the rotating shaft to accelerate its rotation. At the same time, during the upward movement of the counterweight ball 52, the momentum is transmitted to the upper connecting shaft 2 through the conical hollow tube 50. Since the upper connecting shaft 2 is connected to the output end of the driving motor 12, this momentum transmission will further accelerate the rotation of the upper connecting shaft 2, thereby driving the entire rotating shaft to accelerate, enabling the rotating shaft to further accelerate its rotation.

[0031] When the water consumption decreases, the flow velocity of the water in the pipeline decreases, and the rotational speeds of the impeller 10 and the rotating shaft also decrease, resulting in a decrease in centrifugal force. In the case of the reduced centrifugal force, the reset spring 41 pushes the auxiliary ring 40 downward, and the auxiliary ring 40 moves downward along the annular receiving groove 14. The downward movement of the auxiliary ring 40 drives the mounting rod 46 to move downward, and the mounting rod 46 drives the second connecting piece 45 to move downward. Since both ends of the support rod 44 are rotatably connected to the first connecting piece 43 and the second connecting piece 45 respectively, and the first connecting piece 43 is rotatably connected to the connecting rod 42, and the connecting rod 42 is also rotatably connected to the swing arm 31, this multi-stage linkage mechanical structure enables the second connecting piece 45 to push the connecting rod 42 to fold through the support rod 44 and the first connecting piece 43 when moving downward, and further drives the swing arm 31 to rotate around the rotating shaft 33, so that the swing arm 31 gradually retracts into a folded state, completing the reset of the swing arm 31. At the same time, the counterweight ball 52 will automatically roll downward along the spiral groove 51 to the bottom of the spiral groove 51 due to gravity, weakening the accelerating effect on the rotating shaft and reducing the rotational speed of the rotating shaft.

[0032] The embodiments of this specific implementation manner are all preferred embodiments of this application, and do not limit the protection scope of the application accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of this application shall be covered within the protection scope of this application.

Claims

1. An industrial circulating pump based on frequency conversion and self - adaptation, characterized in that, It includes an impeller housing (1), a rotating shaft vertically rotatably installed inside the impeller housing (1), an impeller (10) concentrically installed on the rotating shaft, a motor housing (11) installed on the impeller housing (1) to cover the impeller (10), a plurality of permanent magnet acceleration devices (3) installed on the axial surface of the rotating shaft, and a driving motor (12) installed inside the motor housing (11) with its output end concentrically and fixedly connected to the rotating shaft. A plurality of driving magnets (13) for driving the permanent magnet acceleration device (3) to accelerate the rotation of the rotating shaft are installed inside the motor housing (11), and the plurality of driving magnets (13) are arranged in a circular array with the center of the rotating shaft as the base point inside the motor housing (11). The permanent magnet acceleration device (3) includes a plurality of raised plates (30) fixedly arranged on the rotating shaft in a circular array with the center of the rotating shaft as the base point, a swing arm (31) with one end abutted against the upper surface of the raised plate (30), a permanent magnet (32) fixedly arranged at the other end of the swing arm (31), and a rotating shaft (33) that passes through the swing arm (31) from the upper surface of the raised plate (30) downward and is rotatably connected to the raised plate (30). The swing arm (31) is rotatably connected to the rotating shaft (33), and the magnetic poles of the driving magnet (13) and the permanent magnet (32) are offset by 90 degrees.

2. The industrial circulating pump based on frequency conversion self - adaptation according to claim 1, characterized in that, An annular receiving groove (14) is opened inside the motor housing (11), and a reset device (4) for resetting the permanent magnet acceleration device (3) is provided inside the annular receiving groove (14).

3. The industrial circulating pump based on frequency conversion self - adaptation according to claim 2, wherein, The reset device (4) includes an auxiliary ring (40) located inside the annular receiving groove (14), a reset spring (41) provided on the top surface of the annular receiving groove (14) for pushing the auxiliary ring (40) to move downward along the annular receiving groove (14), a connecting rod (42) with one end rotatably connected to the end of the swing arm (31) away from the raised plate (30), a first connecting piece (43) abutted against the upper surface of the end of the connecting rod (42) away from the swing arm (31) and rotatably connected to the connecting rod (42), a first installation groove vertically and throughly opened on the first connecting piece (43), a support rod (44) with one end located in the first installation groove and rotatably connected to the first connecting piece (43), a second connecting piece (45) provided at the end of the support rod (44) away from the first connecting piece (43), a second installation groove vertically and throughly opened on the second connecting piece (45), and an installation rod (46) with one end abutted against the upper surface of the second connecting piece (45) and rotatably connected to the second connecting piece (45). The other end of the installation rod (46) is fixedly connected to the auxiliary ring (40), the end of the support rod (44) away from the first connecting piece (43) is located in the second installation groove and rotatably connected to the second connecting piece (45), and the horizontal heights of the auxiliary ring (40) and the installation rod (46) are both higher than that of the connecting rod (42).

4. The industrial circulating pump based on frequency conversion and self - adaptation according to claim 3, characterized in that, A plurality of the reset springs (41) are provided.

5. The industrial circulating pump based on frequency conversion self - adaptation according to claim 1, wherein, Jagged raised blocks (15) are fixedly provided at the edge of the impeller (10).

6. The industrial circulating pump based on frequency conversion and self - adaptation according to claim 1, characterized in that, The rotating shaft includes an upper connecting shaft (2) for connecting the output end of the driving motor (12) and a lower connecting shaft (20) for connecting the impeller (10). A conical acceleration structure (5) for accelerating the rotation of the rotating shaft is provided between the lower connecting shaft (20) and the upper connecting shaft (2).

7. The industrial circulating pump based on frequency conversion and self - adaptation according to claim 6, wherein, The conical acceleration structure (5) includes a conical hollow tube (50) located between the lower connecting shaft (20) and the upper connecting shaft (2) and fixedly connected to the lower connecting shaft (20) and the upper connecting shaft (2) at both ends, a spiral groove (51) opened on the inner wall of the conical hollow tube (50) along the height direction of the conical hollow tube (50), and a plurality of counterweight balls (52) placed inside the spiral groove (51). The conical hollow tube (50) is arranged upward with a gradually increasing diameter from small to large.

8. The industrial circulating pump based on frequency conversion self - adaptation according to claim 7, characterized in that, A conical baffle (53) for blocking the spiral groove (51) is fixedly arranged inside the conical tube.

9. The industrial circulating pump based on frequency conversion self - adaptation according to claim 1, characterized in that, The driving motor (12) is a permanent magnet synchronous motor.

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