Centrifugal pump unit with circuit protection function

Abstract

The invention discloses a centrifugal pump unit with a circuit protection function, and relates to the technical field of water pump control boxes, the centrifugal pump unit comprises a water pump control box, a frequency converter used for regulating and controlling the running current of a centrifugal pump is assembled in the water pump control box, and the frequency converter can limit the running current interval of the centrifugal pump. The side portion of the frequency converter is provided with a protection assembly used for circuit on-off control, the protection assembly comprises a driving motor, the driving motor can drive the protection assembly to act during operation so as to achieve on-off protection of a frequency converter circuit, and the driving motor reversely acts to be matched with elastic reset of a connecting spring so that the wire contact can be attached to the base again. Compared with the prior art, the complexity of maintenance operation and the cost of consumables are greatly reduced, especially for a water supply scene of a deeply-buried centrifugal pump, water supply can be rapidly recovered without disassembling pipelines and replacing parts by using large tools after equipment fails, the water supply stopping time is effectively shortened, and the water use continuity of scenes such as family members is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of centrifugal pump control box technology, specifically to a centrifugal pump unit with circuit protection function, which is adapted to the electrical control and circuit protection of centrifugal pumps. It is particularly suitable for centralized control, frequency conversion speed regulation and rapid fault circuit protection of deep-buried vertical well centrifugal pumps and water tank centrifugal pumps in civil constant pressure water supply scenarios, and is adapted to the operation control and safety protection needs of centrifugal pump equipment. Background Technology

[0002] Constant pressure water supply systems, as core equipment for ensuring domestic water supply in office buildings, residential compounds, and other similar settings, require a balance between stable water pressure, energy efficiency, and operational safety through the regulation of centrifugal pumps. Furthermore, they must meet the ease of maintenance requirements for deeply buried centrifugal pumps. With the continuous increase in domestic water demand, the technological evolution of constant pressure water supply systems towards "intelligent and precise control, comprehensive protection functions, significant energy-saving effects, and simplified maintenance and operation" is becoming increasingly prominent, representing a key bottleneck restricting the upgrading and optimization of domestic water supply systems.

[0003] In the field of civilian constant pressure water supply, although existing water supply control devices adapted to centrifugal pumps have achieved basic pumping and water supply regulation functions, they still face significant technical bottlenecks in practical applications. Some vertical shaft centrifugal pumps lack dedicated water level control devices and are in a state of continuous operation for a long time, which not only leads to serious waste of water resources and electricity, but also easily causes pump burnout due to the lack of necessary protections such as overcurrent, phase loss, and undervoltage. Another type of centrifugal pump in residential housing pools has control devices that have been used for a long time and have a high failure rate. They cannot achieve frequency conversion regulation based on pressure signals, resulting in large fluctuations in water supply pressure and high operating energy consumption, with the motor maintaining high current operation for a long time. At the same time, both centrifugal pumps are installed 30-40 meters below the ground, and the pipeline is laid for a long time. When the existing control device fails, a crane is required to lift the centrifugal pump and pipeline, and multiple people are needed for repair. This not only makes the construction difficult, but also incurs high costs for equipment replacement, crane rental, and labor, resulting in high maintenance costs. Therefore, developing a water supply device that can be quickly assembled and features intelligent control, comprehensive protection, energy efficiency, and convenient maintenance has become a key technical challenge that urgently needs to be overcome in this field.

[0004] The existing technology still has the following drawbacks in practical applications: Lack of intelligent control and energy-saving design: The existing centrifugal pumps in the water tank are not equipped with a variable frequency control structure, so they cannot dynamically adjust the operating power according to the pressure of the water tank. The water supply pressure is difficult to stabilize within the required range, and the motor runs at the rated high current for a long time, resulting in serious energy loss. This does not meet the energy-saving requirements and cannot be adapted to the variable frequency speed regulation operation characteristics of the centrifugal pump.

[0005] Inadequate protection functions and low reliability: Existing vertical shaft centrifugal pumps lack a water level linkage control mechanism, and cannot automatically start and stop according to the water tank level, which can easily lead to water tank overflow or dry running due to lack of water; at the same time, most devices lack multiple circuit protections for centrifugal pumps such as overcurrent, phase loss, and undervoltage, and cannot cut off the circuit in time when a fault occurs, resulting in a high risk of centrifugal pump burnout; even if some devices have basic protection functions, they are mostly one-time disconnection structures, and parts need to be replaced after the fault is eliminated to restore operation, resulting in low maintenance efficiency.

[0006] The circuit switching and reset structure design is unreasonable: the circuit protection of the existing device relies on a single electrical component and lacks a mechanical and electrical coordinated disconnection structure. It is prone to protection failure in complex environments such as strong electromagnetic interference. Moreover, there is no dedicated resettable disconnection mechanism. The circuit restoration operation after a fault is cumbersome. The connection point lacks guidance and buffer design, which can easily lead to poor contact due to the vibration of the centrifugal pump, affecting the stable operation of the centrifugal pump.

[0007] Poor compatibility of multi-pump collaborative control and signal transmission: The existing device does not form a unified control center. The operation and regulation of the vertical shaft centrifugal pump and the water tank centrifugal pump are independent of each other, and it is impossible to achieve collaborative linkage based on liquid level and pressure signals. At the same time, signal transmission relies heavily on traditional wired cables, which not only increases material and construction costs, but also has the problem of insufficient stability for long-distance transmission.

[0008] Insufficient ease of assembly and maintenance: The existing control device has a scattered internal component layout, messy wiring connections, and lacks a centralized assembly structure, resulting in low efficiency for rapid assembly and maintenance; in addition, it has not designed a convenient emergency handling structure for the characteristics of deeply buried centrifugal pumps, and large equipment is required to extract the centrifugal pump after equipment failure, resulting in long maintenance cycles and high costs.

[0009] Therefore, in view of this, the present invention proposes a centrifugal pump unit with circuit protection function to make up for and improve the deficiencies of the prior art. Summary of the Invention

[0010] To address the aforementioned technical problems, this invention provides a centrifugal pump unit with circuit protection function, thereby resolving the technical issues raised in the background section.

[0011] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a centrifugal pump unit with circuit protection function, including a pump control box, wherein the pump control box is equipped with a frequency converter for regulating the operating current of the centrifugal pump, the frequency converter can limit the operating current range of the centrifugal pump, and a protective component for circuit on / off control is provided on the side of the frequency converter, the protective component including a drive motor, the drive motor can drive the protective component to operate during operation, so as to realize the on / off protection of the frequency converter circuit.

[0012] Furthermore, the pump control box is equipped with a control module for collecting the operating signals of the water supply system and outputting control commands. Below the control module is a frequency converter that receives commands and adjusts the operating parameters of the centrifugal pump. A contactor is installed on the side of the frequency converter, and wires for transmitting electrical signals and power are laid between the components, forming a centralized electrical control hub adapted to the centrifugal pump in the water tank.

[0013] Furthermore, the protective component includes an external sleeve, which is sleeved on the outside of symmetrically distributed conductors on the rear side of the frequency converter, and the external sleeve is slidably connected to the conductors.

[0014] Furthermore, an energized contact is provided at the end of the conductor away from the frequency converter, and an energized base is installed on the side wall of the water pump control box at the position corresponding to the energized contact. An external sleeve is sleeved on the outside of the energized contact of the conductor, and a connecting spring is installed between the external sleeve and the external sleeve.

[0015] Furthermore, the outer wall of the outer sleeve is symmetrically fixedly connected with branch flexible shafts along its circumference, and the outer wall of each branch flexible shaft is fixedly connected with a connecting crankshaft. The connecting crankshaft is divided into upper and lower groups along the axial direction of the outer sleeve. Each group of connecting crankshafts is symmetrically distributed with the axis of the outer sleeve as the center of symmetry, and the connecting crankshafts of each group together form a rhombus structure.

[0016] Furthermore, a set of connecting crankshafts located below the external sleeve has a limit block fixedly connected to one end of each other, and the limit block is fixedly connected to the inside of the water pump control box. A set of connecting crankshafts located above the external sleeve has a nut collar fixedly connected to one end of each other, the nut collar is slidably connected to the side wall of the water pump control box, and the inner wall of the nut collar is threadedly connected to a threaded shaft. The end of the threaded shaft away from the nut collar is assembled to the outer wall of the output end of the drive motor. The nut collar and the threaded shaft form a ball screw structure.

[0017] Furthermore, a connecting hose is fitted between the outer sleeve and the outer buckle, with one end of the connecting hose being fixedly connected to the outer sleeve and the other end being movably connected to the outer buckle.

[0018] Furthermore, the outer walls of the external sleeves are all fixedly connected with branch convex shafts, and the outer walls of the branch convex shafts are all fixedly connected with crankshaft racks. The crankshaft racks are staggered, and a gear shaft meshes with the side of the crankshaft racks that are close to each other. The end of the gear shaft away from the crankshaft rack is assembled to the outer wall of the output end of the drive motor.

[0019] Furthermore, on both sides of the water pump control box, corresponding to the outer side of the power-on base, a vertical shaft centrifugal pump and a water tank centrifugal pump are electrically connected via external wires.

[0020] Furthermore, the water pump control box is equipped with a water level detection device, which is connected to the control module for real-time acquisition of the water level data of the residential compound's water tank. When the water level is below 50%, the vertical shaft centrifugal pump is triggered to start; when it is above 80%, the vertical shaft centrifugal pump is triggered to stop. The frequency converter inside the water pump control box is electrically connected to the water tank centrifugal pump, which receives the signal from the pressure sensor on the water storage tank and adjusts the output frequency to control the operating power of the water tank centrifugal pump, so that the pressure of the water storage tank is maintained within a suitable range, and the operating current of the water tank centrifugal pump is limited to a suitable range.

[0021] Compared with the prior art, the beneficial effects of the present invention are: (1) This device has significant advantages in circuit protection and restoration. Its protection components realize resettable connection after fault disconnection, which is different from the traditional one-time disconnection structure (such as fuse blowout, connector damage). The circuit can be restored without frequent replacement of parts. After the faults such as overheating are eliminated, only the reverse action of the drive motor is needed to cooperate with the elastic reset of the connecting spring to allow the wire contact head to re-fit with the base, which greatly reduces the complexity of maintenance operations and consumable costs. Especially for the water supply scenario of deep buried centrifugal pump, after the equipment fails, there is no need to use large tools to disassemble the pipeline and replace the parts. The water supply can be quickly restored, effectively reducing the water outage time and ensuring the water supply continuity in scenarios such as family compounds.

[0022] Most importantly, the rhomboid structure formed by the connecting crankshaft provides a stable linkage basis for the operation of the protective component. The structure is symmetrically distributed with the outer sleeve as the center, which can evenly transmit the tension during the driving process, avoiding the outer sleeve from being skewed due to unilateral force. This ensures that the separation and contact trajectory of the wire contact head and the base is precise and controllable, effectively avoiding the problem of action jamming or misalignment. At the same time, the symmetrical force characteristics of the rhomboid structure can disperse the load-bearing stress of individual components, reduce local wear of the branch flexible shaft and connecting crankshaft, extend the overall service life of the protective component, and improve the stability and durability of the switching action.

[0023] In practical use, the combined design of the connecting spring and the oblique tension further optimizes the reliability of circuit switching. In the initial state, the preload of the connecting spring allows the wire contact head to fit tightly with the base, avoiding poor contact caused by equipment vibration. During disconnection, the spring is stretched and stores elastic potential energy as the rhomboid structure deforms, reserving power for subsequent reset. During the reset phase, the elastic force released by the spring is converted into a uniform oblique tension, which not only avoids hard collision between the contact head and the base, protecting the integrity of the contact surface, but also accommodates slight installation errors, improving the compatibility of the structure and effectively ensuring the connection stability after the circuit is restored.

[0024] (2)Regarding the meshing drive between the gear shaft and the crankshaft rack introduced in the second embodiment, with the flexible assistance of the connecting hose, the implementation mode of the protection component is further increased. The rotation of the gear shaft is stably converted into the horizontal linear movement of the crankshaft rack, and the transmission trajectory is more controllable, avoiding the offset and jamming problems that are prone to occur in the traditional linkage structure. During the reset stage, the connecting hose releases the pre-deformation to assist the external sleeve buckle to return smoothly. This not only prevents the wires from being wound and knotted due to uneven reset speed, but also adapts to the slight installation errors during the horizontal movement, making the contact between the wire contact head and the base more precise.

[0025] During the actual use process, through the cooperation of the connecting hose and the horizontal pulling action, this device effectively solves the problems of wire wear and uneven stress during the on-off process. When the driving motor drives the external sleeve buckle to move horizontally, the connecting hose adaptively expands, contracts, and bends in the form of flexible support along with the external sleeve buckle, and always completely wraps around the outside of the wire. This not only avoids local stress concentration, wear, and even fracture of the wire due to direct pulling, but also provides a buffer for the horizontal movement of the wire, weakening the impact force during the action process and preventing the wire from deforming due to instantaneous force.

[0026] (3)Through the linkage between the water level detection device and the control module, this device realizes the automatic start and stop of the shaft-mounted centrifugal pump, getting rid of the limitation of the traditional water supply device relying on manual monitoring of the liquid level. In daily water use scenarios such as residential courtyards, there is no need for on-site personnel to continuously monitor the water tank liquid level. The control module can automatically trigger the start and stop of the centrifugal pump according to the real-time collected liquid level data. This not only avoids the water tank overflow or the centrifugal pump running dry due to the lag of manual operation, but also reduces the risk of equipment damage caused by human negligence. At the same time, it also reduces the cost of manual management. This automatic control method significantly improves the continuity and safety of water supply. Even during periods when personnel are too busy to take care of it, it can stably ensure the reasonable liquid level of the water tank.

[0027] The cooperation between the frequency converter and the pressure sensor, combined with the coordinated regulation of the two centrifugal pumps, not only ensures the stable pressure at the water use end but also realizes the precise control of energy consumption. The frequency converter can dynamically adjust the operating power of the water tank centrifugal pump according to the pressure of the water storage tank, making the pressure during the peak water use period stable enough and significantly reducing the energy consumption during the low water use period, avoiding the energy waste caused by the long-term high-power operation of the traditional constant-speed pump. At the same time, as the centralized control center, the water pump control box integrates the liquid level and pressure signals to realize the linkage of the two pumps, avoiding the disorder of single-pump independent operation. When the state of one party changes, the other party can timely adapt and adjust, making the operation of the entire water supply system more coherent and smooth. This not only improves the water use experience but also extends the service life of the centrifugal pump and reduces the frequency and cost of later equipment maintenance. Description of the Drawings

[0028] Figure 1This is an axial-view three-dimensional structural diagram of the water pump control box in Embodiment 1 of the present invention.

[0029] Figure 2 This is a rear-view three-dimensional structural diagram of the water pump control box in Embodiment 1 of the present invention.

[0030] Figure 3 This is a schematic diagram of the internal rear view of the water pump control box in Embodiment 1 of the present invention.

[0031] Figure 4 This is a schematic diagram of the three-dimensional structure of the crankshaft connection in Embodiment 1 of the present invention.

[0032] Figure 5 This is a schematic diagram of the three-dimensional structure of the connecting spring in Embodiment 1 of the present invention.

[0033] Figure 6 This is an exploded view showing the positional relationship between the connecting spring and the wire in Embodiment 1 of the present invention.

[0034] Figure 7 This is a rear-view three-dimensional structural diagram of the water pump control box in Embodiment 2 of the present invention.

[0035] Figure 8 This is a schematic diagram of the internal rear view of the water pump control box in Embodiment 2 of the present invention.

[0036] Figure 9 This is a schematic diagram of the three-dimensional structure of the crankshaft rack in Embodiment 2 of the present invention.

[0037] Figure 10 This is a schematic diagram of the three-dimensional structure of the connecting hose in Embodiment 2 of the present invention.

[0038] Figure 11 This is an exploded view showing the positional relationship between the connecting hose and the wire in Embodiment 2 of the present invention.

[0039] Figure 12 This is a simplified diagram showing the connection relationship between the water pump control box and each centrifugal pump in Embodiment 3 of the present invention.

[0040] Figure 13 This is a logic flowchart of the liquid level control module in Embodiment 3 of the present invention.

[0041] The following are the labels in the diagram: 1. Pump control box; 11. Control module; 12. Frequency converter; 13. Contactor; 14. Wire; 2. Protective components; 21. External sleeve; 22. External buckle; 23. Connecting spring; 24. Branch flexible shaft; 25. Connecting crankshaft; 26. Limit block; 27. Nut collar; 28. Threaded shaft; 29. ​​Drive motor; 210. Connecting hose; 211. Branch cam shaft; 212. Crankshaft rack; 213. Gear shaft; 3. Vertical shaft centrifugal pump; 4. Water tank centrifugal pump. Detailed Implementation

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] It should be noted that the water pump control box 1 in this device is a dedicated control box adapted to the centrifugal pump 4 in the water tank, providing centralized housing and protection for electrical components. Through the existing box structure's sealing and support design, it provides installation space for components such as the control module 11 and frequency converter 12, while isolating external dust and moisture from affecting internal components. The control module 11 is a dedicated control module adapted to the centrifugal pump 4 in the water tank, providing operation signal acquisition and control command output functions. Through the existing signal acquisition and command output circuit, it acquires signals from the water level detection device and pressure sensor in real time, and outputs corresponding start / stop and parameter adjustment commands to the frequency converter 12 and contactor 13. The frequency converter 12 is a dedicated frequency conversion control component adapted to the centrifugal pump 4 in the water tank, providing frequency conversion control functions for the operating parameters of the centrifugal pump 4 in the water tank. Through the existing frequency conversion control circuit, it receives commands from the control module 11 to adjust the output frequency, thereby controlling the operating power of the centrifugal pump 4 in the water tank, while limiting the operating current of the centrifugal pump 4 in the water tank to a preset range. The wire 14... It provides the function of transmitting electrical signals and electrical energy, and transmits electrical signals between components such as control module 11, frequency converter 12, and contactor 13 through the interface adapter of existing conductive cables, while delivering the electrical energy required for operation of the water tank centrifugal pump 4.

[0044] The working principles of the aforementioned components, such as the enclosure protection and installation layout principle of the water pump control box 1, the signal processing and command output principle of the control module 11, the frequency conversion control principle of the frequency converter 12, the electromagnetic switching principle of the contactor 13, the conductive transmission principle of the wire 14, their connection relationship with the vertical shaft centrifugal pump 3 and the water tank centrifugal pump 4 of this device, the internal installation layout of the water pump control box 1, the signal interface parameters and installation method of the control module 11, the power adaptation and wiring method of the frequency converter 12, the contact specifications and layout position of the contactor 13, and the wire diameter selection and wiring method of the wire 14, are all existing technologies. Since the subsequent specific adaptation and operation control methods of these structures are all part of this device, they will not be described in detail here.

[0045] Please refer to Figure 1 - Figure 11As shown, a centrifugal pump unit with circuit protection function includes a pump control box 1. The pump control box 1 is equipped with a frequency converter 12 for regulating the operating current of the centrifugal pump 4 in the water tank. The frequency converter 12 can limit the operating current range of the centrifugal pump 4 in the water tank according to the operating characteristics of the centrifugal pump 4. The side of the frequency converter 12 is provided with a protection component 2 for circuit on / off control. The protection component 2 includes a drive motor 29. When the drive motor 29 is running, it can drive the protection component 2 to operate, so as to realize the on / off protection of the circuit of the frequency converter 12 and adapt to the circuit safety protection requirements of the centrifugal pump 4 in the water tank.

[0046] It should be noted that the water pump control box 1 is equipped with a control module 11 for collecting the operation signals of the water supply system and outputting control commands. Below the control module 11 is a frequency converter 12 that receives commands and adjusts the operating parameters of the centrifugal pump 4 in the water tank. A contactor 13 is installed on the side of the frequency converter 12, and wires 14 for transmitting electrical signals and power are laid between the components, forming a centralized electrical control hub adapted to the centrifugal pump 4 in the water tank.

[0047] Please refer to Figure 1 - Figure 6 As shown, the protective component 2 includes an external sleeve 21, which is sleeved on the outside of the symmetrically distributed wires 14 on the rear side of the inverter 12, and the external sleeve 21 and the wires 14 are slidably connected. The end of the wires 14 away from the inverter 12 is provided with an energized contact head. The side wall of the water pump control box 1 is equipped with an energized base at the position of the energized contact head. An external sleeve 22 is sleeved on the outside of the energized contact head of the wires 14. A connecting spring 23 is installed between the external sleeve 21 and the external sleeve 22. A branch flexible shaft 24 is symmetrically fixedly connected to the outer wall of the external sleeve 22 along its circumference. A connecting crankshaft 25 is fixedly connected to the outer wall of the branch flexible shaft 24. The connecting crankshaft 25 is divided into upper and lower groups along the axial direction of the external sleeve 22. Each group of connecting crankshafts 25 is symmetrically distributed with the axis of the external sleeve 22 as the center of symmetry, and the groups of connecting crankshafts 25 together form a rhomboid structure.

[0048] It should be noted that a set of connecting crankshafts 25 located below the outer sleeve 22 has a limit block 26 fixedly connected to one end of each other, and the limit block 26 is fixedly connected to the inside of the water pump control box 1. A set of connecting crankshafts 25 located above the outer sleeve 22 has a nut collar 27 fixedly connected to one end of each other, the nut collar 27 is slidably connected to the side wall of the water pump control box 1, and the inner wall of the nut collar 27 is threadedly connected to a threaded shaft 28. The end of the threaded shaft 28 away from the nut collar 27 is assembled to the outer wall of the output end of the drive motor 29. The nut collar 27 and the threaded shaft 28 form a ball screw structure.

[0049] Specifically, when the water supply device is in normal operation, the protective component 2 is in the initial linkage state: the external sleeve 21 is fitted onto the outside of the wire 14 to keep its layout neat, the connecting spring 23 is in a natural extension state, providing pre-tightening force to the external sleeve 22, so that the energized contact head of the wire 14 is tightly fitted with the energized base, avoiding poor contact caused by the vibration of the water tank centrifugal pump 4; the diamond structure formed by the branch flexible shaft 24 and the connecting crankshaft 25 remains stable, and the limiting block 26 fixes the end of the lower set of connecting crankshafts 25 to prevent the protective component 2 from shifting due to equipment vibration. In this state, the protective component 2 not only ensures the stable connection of the circuit, but also reserves the linkage basis for subsequent on / off actions, adapting to the stable operation requirements of the water tank centrifugal pump 4.

[0050] When the protection device detects that the inverter 12 or the circuit temperature is too high, the control module 11 sends a start command to the drive motor 29: the output end of the drive motor 29 drives the threaded shaft 28 to rotate. Since the nut collar 27 and the threaded shaft 28 form a ball screw structure, the rotational motion of the threaded shaft 28 is converted into the linear movement of the nut collar 27 along the side wall of the water pump control box 1. At this time, the upper set of connecting crankshafts 25, which are fixedly connected to the nut collar 27, will move synchronously with the nut collar 27, thereby pulling the branch flexible shaft 24, causing the rhomboid structure enclosed by the connecting crankshaft 25 and the branch flexible shaft 24 to deform.

[0051] During the synchronous movement of the external sleeve 22 with the branch flexible shaft 24, the energized contact head of the wire 14 will gradually separate from the energized base, and the connecting spring 23 will be stretched to store elastic potential energy. Meanwhile, the limiting block 26 always fixes the end of the lower set of connecting crankshafts 25 to prevent the overall displacement deviation of the protective assembly 2. This process, through the cooperation of the drive motor 29, the ball screw structure and the diamond linkage structure, realizes the rapid disconnection of the circuit. Its core function is to prevent the circuit from continuing to run under overheating conditions, protect the inverter 12 and other components from damage, and prevent the water tank centrifugal pump 4 from being damaged due to circuit failure.

[0052] After the overheating fault is cleared, the control module 11 sends a reverse command to the drive motor 29: the drive motor 29 drives the threaded shaft 28 to rotate in the opposite direction, the nut collar 27 slides in the opposite direction along the side wall of the water pump control box 1, and the upper set of connecting crankshafts 25 resets accordingly. The force of the branch flexible shaft 24 pulling the external sleeve 22 gradually weakens. At this time, the connecting spring 23 releases the stored elastic potential energy and applies a reset pull to the external sleeve 22, so that the energized contact of the wire 14 is tightly attached to the energized base again. At the same time, the rhomboid structure enclosed by the branch flexible shaft 24 and the connecting crankshaft 25 returns to the initial stable state. During this reset process, the transmission of the ball screw structure ensures the accuracy of the reset trajectory of the connecting crankshaft 25, and the elastic force of the connecting spring 23 improves the tightness of the contact between the energized contact and the base. Finally, the protection component 2 returns to the linkage state of the normal operation stage, realizing the rapid and stable reconnection of the circuit, greatly reducing the recovery time after equipment failure, and ensuring that the water tank centrifugal pump 4 quickly resumes normal water supply.

[0053] Example 2: Based on Example 1, please refer to... Figure 7 - Figure 11 As shown, a connecting hose 210 is assembled between the outer sleeve 21 and the outer buckle 22. One end of the connecting hose 210 is fixedly connected to the outer sleeve 21, and the other end is movably connected to the outer buckle 22. Branch convex shafts 211 are fixedly connected to the outer walls of the outer buckle 22. Crankshaft racks 212 are fixedly connected to the outer walls of the branch convex shafts 211. The crankshaft racks 212 are staggered, and a gear shaft 213 meshes with the side of the crankshaft racks 212 that is close to each other. The end of the gear shaft 213 away from the crankshaft rack 212 is assembled to the outer wall of the output end of the drive motor 29.

[0054] Specifically, when the water supply device is operating normally, the components in Embodiment 2 are in the initial linkage state: one end of the connecting hose 210 is fixed on the outer sleeve 21, and the other end is movably connected to the outer sleeve buckle 22, in a naturally relaxed flexible support state; the branch convex shaft 211 on the outer wall of the outer sleeve buckle 22 firmly supports the crankshaft rack 212, and the staggered crankshaft rack 212 and gear shaft 213 are engaged but stationary. This engagement state not only ensures the structural stability of the protective component 2, but also avoids component displacement when there is no movement, providing a reliable circuit guarantee for the stable operation of the water tank centrifugal pump 4.

[0055] Similar to Embodiment 1, when the protection device detects an excessively high temperature, the control module 11 starts the drive motor 29. The output of the drive motor 29 drives the gear shaft 213 to rotate. Since the crankshaft rack 212 and the gear shaft 213 are in an interleaved meshing state, the rotational motion of the gear shaft 213 is converted into the linear movement of the crankshaft rack 212. The branch cam 211 moves synchronously with the crankshaft rack 212, thereby driving the external sleeve 22 to move away from the energized base. During this process, the connecting hose 210 moves with the external sleeve 22. The flexible sleeve 210 adapts to expansion and contraction, always wrapping around the outside of the wire 14 to prevent the wire 14 from being worn or broken due to pulling. At the same time, the external sleeve 22 pulls the wire 14, causing its energized contact head to gradually separate from the energized base, thus cutting off the circuit. The meshing transmission between the gear shaft 213 and the crankshaft rack 212 improves the accuracy of the action, while the protective function of the connecting hose 210 provides a buffer during the movement of the wire 14. Ultimately, it efficiently completes the circuit protection under overheating conditions, preventing the water tank centrifugal pump 4 from malfunctioning due to circuit overheating.

[0056] After the overheating fault is cleared, the control module 11 controls the drive motor 29 to reverse, and the gear shaft 213 rotates in the opposite direction, driving the crankshaft rack 212 and the branch cam 211 to move in the opposite direction. The external sleeve 22 is reset towards the energized base under the drive of the crankshaft rack 212. At this time, the connecting hose 210 releases its previous deformation, assists the external sleeve 22 to move smoothly, and further pushes the energized contact head of the wire 14 to re-fit with the energized base. During this process, the meshing transmission of the gear shaft 213 and the crankshaft rack 212 ensures the accuracy of the reset trajectory, and the connecting hose 210 avoids the wire 14 from getting tangled or stuck during the reset process. Finally, the protection component 2 returns to the initial stable state, realizing the rapid and reliable reconnection of the circuit and ensuring that the water tank centrifugal pump 4 resumes water supply in time.

[0057] Example 3: Based on Example 1, please refer to... Figure 12 and Figure 13 As shown, the two sides of the water pump control box 1, corresponding to the outer sides of the power-on base, are electrically connected to the vertical shaft centrifugal pump 3 and the water tank centrifugal pump 4 via external wires. The water pump control box 1 is equipped with a water level detection device, which is signal-connected to the control module 11 and is used to collect the liquid level data of the family compound water tank in real time. When the liquid level is lower than 50%, the vertical shaft centrifugal pump 3 is triggered to start, and when it is higher than 80%, the vertical shaft centrifugal pump 3 is triggered to stop. The frequency converter 12 inside the water pump control box 1 is electrically connected to the water tank centrifugal pump 4 and is used to receive the signal from the pressure sensor on the water storage tank and adjust the output frequency, thereby controlling the operating power of the water tank centrifugal pump 4, so that the pressure of the water storage tank is maintained within a suitable range, and at the same time, the operating current of the water tank centrifugal pump 4 is limited to a suitable range.

[0058] Specifically, when the water supply device is in normal operation, the water level detection device inside the water pump control box 1 will collect the liquid level data of the family compound's water tank in real time and continuously transmit the data to the control module 11; the control module 11 analyzes the liquid level data in real time: if the detected liquid level is below 50% (low water level state), the control module 11 triggers the indicator device to start (such as the indicator light lighting up), prompting on-site personnel to pay attention to the liquid level change; if the liquid level reaches the pump start water level (50%), the control module 11 sends a pull-in command to the contactor 13, the main contacts of the contactor 13 close, and the water pump control box 1... The circuit between the vertical shaft centrifugal pump 3 and the control module 11 is connected, and the vertical shaft centrifugal pump 3 starts and begins pumping water. If the liquid level rises to 80% (excessive water level), the control module 11 sends a disconnect command to the contactor 13. The main contacts of the contactor 13 separate, and the vertical shaft centrifugal pump 3 stops running. At the same time, the control module 11 triggers the warning device. During this process, the real-time acquisition function of the water level detection device ensures the timeliness of the liquid level data. The command parsing and output of the control module 11 realizes the automatic start and stop of the vertical shaft centrifugal pump 3, avoiding the lag of manual operation and reducing the risk of water tank overflow or dry running due to lack of water.

[0059] While the vertical shaft centrifugal pump 3 replenishes water to the residential compound's water tank, the pressure sensor on the storage tank collects pressure data in real time and transmits the data to the control module 11 inside the pump control box 1. The control module 11 then forwards the pressure data to the frequency converter 12. If the pressure in the storage tank deviates from the appropriate range, the frequency converter 12 adjusts its output frequency, thereby changing the operating power of the centrifugal pump 4 in the water tank: when the pressure is too low, the frequency converter 12 increases the output frequency, the operating power of the centrifugal pump 4 in the water tank increases, and the pumping efficiency is improved to replenish the pressure; when the pressure is too high, the frequency converter 12 decreases the output frequency, the operating power of the centrifugal pump 4 in the water tank decreases, and at the same time, the frequency converter 12 limits the operating current of the centrifugal pump 4 in the appropriate range of 5A (during off-peak water use) to 14A (during peak water use). During this stage, the frequency conversion control function of the frequency converter 12 not only ensures the stability of the water tank pressure and meets the pressure demand of the water user, but also achieves reasonable energy consumption control by limiting the operating current, thus improving the energy efficiency of the device.

[0060] When the vertical shaft centrifugal pump 3 is running and the water tank centrifugal pump 4 is in frequency conversion control mode, the pump control box 1, acting as the control center, integrates the signals from the water level detection device and the pressure sensor through the control module 11 to achieve coordinated operation of the two centrifugal pumps. For example, after the vertical shaft centrifugal pump 3 starts replenishing water, the water level in the residential area's water tank rises, the water inlet to the storage tank increases, the pressure sensor reports an increase in pressure, and the frequency converter 12 immediately reduces the operating power of the water tank centrifugal pump 4. If an abnormal situation occurs (such as the water level detection device reporting a level that is continuously higher than 80%), the control module 11 will keep the contactor 13 in the open state to maintain the vertical shaft centrifugal pump 3 in the stopped state, while controlling the frequency converter 12 to adjust the operating parameters of the water tank centrifugal pump 4, prioritizing the stability of the water tank pressure. During this process, the centralized control structure of the pump control box 1 realizes the linkage control of the two centrifugal pumps, avoiding the disorder of independent operation of a single pump and improving the operational stability and reliability of the entire water supply system.

[0061] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A centrifugal pump unit with circuit protection function, comprising a pump control box, characterized in that: The pump control box is equipped with a frequency converter for regulating the operating current of the centrifugal pump. The frequency converter can limit the operating current range of the centrifugal pump. The side of the frequency converter is provided with a protection component for circuit on / off control. The protection component includes a drive motor. When the drive motor is running, it can drive the protection component to operate, so as to realize the on / off protection of the frequency converter circuit.

2. A centrifugal pump unit with circuit protection function according to claim 1, characterized in that: The pump control box is equipped with a control module for collecting water supply system operation signals and outputting control commands. Below the control module is a frequency converter that receives commands and adjusts the centrifugal pump operating parameters. A contactor is mounted next to the side of the frequency converter, and wires for transmitting electrical signals and energy are laid between the components.

3. A centrifugal pump unit with circuit protection function according to claim 1, characterized in that: The protective component includes an external sleeve, which is fitted onto the outside of the symmetrically distributed conductors on the rear side of the frequency converter, and the external sleeve is slidably connected to the conductors.

4. A centrifugal pump unit with circuit protection function according to claim 3, characterized in that: The end of the conductor away from the frequency converter is provided with an energized contact head. The side wall of the water pump control box is equipped with an energized base at the position corresponding to the energized contact head. An external sleeve is sleeved on the outside of the energized contact head of the conductor. A connecting spring is installed between the external sleeve and the external sleeve.

5. A centrifugal pump unit with circuit protection function according to claim 4, characterized in that: The outer wall of the outer sleeve is symmetrically fixedly connected with branch flexible shafts along its circumference. The outer wall of each branch flexible shaft is fixedly connected with a connecting crankshaft. The connecting crankshaft is divided into upper and lower groups along the axial direction of the outer sleeve. Each group of connecting crankshafts is symmetrically distributed with the axis of the outer sleeve as the center of symmetry, and the connecting crankshafts of each group together form a rhombus structure.

6. A centrifugal pump unit with circuit protection function according to claim 4, characterized in that: A set of connecting crankshafts located below the external sleeve has a limit block fixedly connected to one end of each other, and the limit block is fixedly connected to the inside of the water pump control box. A set of connecting crankshafts located above the external sleeve has a nut collar fixedly connected to one end of each other, the nut collar is slidably connected to the side wall of the water pump control box, and the inner wall of the nut collar is threadedly connected to a threaded shaft. The end of the threaded shaft away from the nut collar is assembled to the outer wall of the output end of the drive motor. The nut collar and the threaded shaft form a ball screw structure.

7. A centrifugal pump unit with circuit protection function according to claim 3, characterized in that: A connecting hose is fitted between the outer sleeve and the outer buckle. One end of the connecting hose is fixedly connected to the outer sleeve, and the other end is movably connected to the outer buckle.

8. A centrifugal pump unit with circuit protection function according to claim 4, characterized in that: The outer walls of the external sleeves are all fixedly connected to branch convex shafts, and the outer walls of the branch convex shafts are all fixedly connected to crankshaft racks. The crankshaft racks are staggered, and a gear shaft meshes with the side of the crankshaft racks that are close to each other. The end of the gear shaft away from the crankshaft rack is assembled to the outer wall of the output end of the drive motor.

9. A centrifugal pump unit with circuit protection function according to claim 1, characterized in that: The pump control box is electrically connected to a vertical shaft centrifugal pump and a water tank centrifugal pump on both sides of the outer side of the power-on base via external wires.

10. A centrifugal pump unit with circuit protection function according to claim 1, characterized in that: The water pump control box is equipped with a water level detection device, which is connected to the control module to collect the liquid level data of the family compound's water tank in real time. When the liquid level is below 50%, the vertical shaft centrifugal pump is triggered to start, and when it is above 80%, the vertical shaft centrifugal pump is triggered to stop. The frequency converter inside the water pump control box is electrically connected to the water tank centrifugal pump. It is used to receive the signal from the pressure sensor on the water storage tank and adjust the output frequency, thereby controlling the operating power of the water tank centrifugal pump to maintain the pressure of the water storage tank within a suitable range, while limiting the operating current of the water tank centrifugal pump within a suitable range.

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