Variable-frequency speed-regulation constant-pressure water supply method for water intake pump ship capable of flexibly changing

Abstract

The invention discloses a variable-frequency speed-regulating constant-pressure water supply method for a flexibly-changing water intake pump ship, and relates to the technical field of water supply systems. According to a data acquisition and analysis strategy, a variable-frequency speed-regulating device is installed on the water intake pump ship and monitors the water level change, the water supply pressure and the water supply flow of a water area in real time through multiple sets of sensors; and the plurality of groups of sensors transmit acquired data to the central control unit. According to the water supply system, the rotating speed of the pump body is matched with the actual requirement through the frequency conversion speed regulation control technology, the stability and reliability of water supply are improved, meanwhile, efficient operation of all the pumps under different water supply requirements is guaranteed through the multi-pump cooperative work strategy, and the reliability and stability of the whole water supply system are improved; the water supply system has the advantages that the water supply failure risk caused by pump failure or unreasonable operation is reduced, soft start and frequency conversion operation are adopted, the start impact and vibration of the pump body are reduced, the maintenance cost is reduced, and the problems of high energy consumption, unstable water supply and the like in a traditional water supply system are solved.

Description

Technical Field

[0001] The invention relates to the technical field of water supply systems, and in particular to a flexible variable frequency speed regulation constant pressure water supply method for a water intake pump ship. Background Art

[0002] In order to speed up the construction of rural drinking water project facilities and improve farmers' production and living standards, at present, in large-amplitude water intake projects, mobile water intake pumping stations are usually used at home and abroad, such as floating pumping stations, cable car pumping stations and submersible hoisting pumping stations. According to the underwater terrain section measurement of the water intake point of the project and the water suction conditions of the pump boat, the comprehensive project is comprehensively analyzed and compared in terms of site conditions, project management, project investment, construction difficulty and water quality, and the water intake pump boat is currently a more reasonable water supply solution.

[0003] For example, the Chinese patent CN113250968A is a "siphon + electric pump water supply type water pump boat", which includes a hull, an electric pump, a water intake pipe 1 and a water intake pipe 2 are fixed on the hull, the water inlet end of the electric pump is connected to the water intake pipe 1, the water outlet end of the electric pump is connected to the water intake pipe 2 through a connecting pipe, one end of the water intake pipe 2 is connected to the siphon pipe, the water intake pipe 2 is connected to a valve 2 and a vacuum pump system, the connecting pipe is connected to a valve 1, the end of the siphon pipe away from the water intake pipe 2 is connected to the water outlet pipe, the ends of the water intake pipe 1 and the water intake pipe 2 that penetrate into the water surface are both provided with a filter mechanism for filtering debris in the water and having an automatic cleaning function, and the hull is provided with an energy capture mechanism for converting water wave energy and driving the filter mechanism.

[0004] The water supply system of traditional water intake pump ships often adjusts the flow rate by adjusting the pump outlet valve, which is not only labor-intensive, but also produces strong vibration and noise, affecting the service life of the pump, and causing serious throttling power loss and electricity waste. In addition, the traditional water supply control method has poor adaptability to changes in different working conditions, and cannot flexibly adjust the operating status of the pump according to actual needs to maintain constant pressure water supply, resulting in energy waste and unstable water supply. When multiple pumps work together, the switching and speed regulation strategies of the pumps are not flexible and efficient, which reduces the reliability and economy of the entire water supply system. In view of the above problems, a flexible variable frequency speed regulation constant pressure water supply method for water intake pump ships is proposed. Summary of the invention

[0005] The object of the present invention is to provide a flexible variable frequency speed regulation constant pressure water supply method for a water intake pump ship to solve the problems raised by the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: a flexible variable frequency speed regulation constant pressure water supply method for water intake pump boat, comprising the following steps:

[0007] Data collection and analysis strategy: By installing a variable frequency speed control device on the water intake pump boat, the variable frequency speed control device monitors the water level changes, water supply pressure and water supply flow in real time through multiple sets of sensors. The multiple sets of sensors transmit the collected data to the central control unit;

[0008] Establishing a correlation model strategy: Based on the big data analysis algorithm, the central control unit analyzes and learns the historical water level data, water flow data in different periods, and the corresponding pump operation parameter data to establish a correlation model of water level-flow-pressure-pump operation parameters;

[0009] Variable frequency speed control strategy: Based on historical water use data and real-time flow data, the central control unit predicts water demand forecast data. At the same time, according to the water pressure signal and water demand forecast data fed back by the sensor, the central control unit adjusts the output frequency of the variable frequency equipment and changes the speed of the water pump;

[0010] Multi-pump collaborative working strategy: When the water supply system of the water pump ship is powered on, the frequency conversion device controls the soft start and frequency conversion operation of the first water pump according to the initial water level and estimated water demand, that is, the first water pump is started at a lower frequency, and the frequency is gradually increased to make the first water pump run smoothly until it is close to the target operating point. If the output frequency of the frequency conversion device rises to the preset upper limit and the water pressure of the output main pipe cannot reach the set value, then after a delay, the first water pump is switched to the industrial frequency main drive, and the second water pump is started for frequency conversion operation, and so on, until the water pressure of the output main pipe reaches the set value;

[0011] Dual constant pressure control strategy: When a fire occurs and the fire button switch is pressed, the central control unit reads the fire button switch signal and immediately controls another constant pressure setting value to start the fire water pressure.

[0012] Preferably, in the variable frequency speed regulation control strategy, the central control unit tracks the deviation change between the pipe network pressure and the given pressure position in real time, and calculates the pump speed adjustment value required to meet the constant pressure water supply through an internal calculation method, and uses vector control technology to adjust the output frequency of the variable frequency equipment to perform variable frequency speed regulation on the variable frequency equipment.

[0013] Preferably, in the multi-pump collaborative working strategy, during the operation of the water pump boat, when the water level rises or the water demand decreases, causing the pressure to increase, the frequency conversion device reduces the operating frequency of the water pump. Conversely, when the water level drops or the pressure decreases during the peak water usage, the frequency conversion device increases the operating frequency of the water pump. At the same time, the pressure deviation is regulated by real-time feedback through the proportional-integral control algorithm, and the speed of the water pump is adjusted to stabilize the water supply pressure within the allowable error range of the set value.

[0014] Preferably, in the multi-pump collaborative working strategy, the central control unit controls the switching points of adding pumps and shutting off pumps not to switch at the set value, and the set value minus a preset value is the pressure judgment point for adding pumps, and the set value plus a preset value is the pressure judgment point for reducing pumps. During the decompression process, the output of the frequency conversion device should be controlled at a preset frequency before the water pump is decompressed, and the preset frequency value can be set according to actual conditions.

[0015] Preferably, in the multi-pump collaborative working strategy, when a single pump cannot meet the water supply demand or is in a low-efficiency operating range, the central control unit automatically starts the standby pump according to the pump's performance curve and current operating conditions. When multiple pumps are in operation, a dynamic load distribution algorithm is used to reasonably distribute the load according to the actual operating efficiency and remaining capacity of each pump, so that each pump can operate in a high-efficiency range. When the water demand decreases and the pump needs to be stopped, the central control unit gives priority to stopping the pump with low operating efficiency or close to a fault warning state, and maintains constant pressure water supply by adjusting the operating frequency of the remaining pumps. During the pump switching process, soft start and soft stop technology is used to achieve smooth switching of the pump.

[0016] Preferably, the variable frequency speed regulation device includes a pump body, a water inlet pipe, a water outlet pipe, a frequency converter, a controller and a water level sensor installed on a water intake pump boat, one end of the water outlet pipe is fixedly connected to a pressure sensor, and one end of the water outlet pipe is fixedly connected to a flow sensor, the frequency converter is electrically connected to the controller, the pressure sensor and the flow sensor are both connected to the controller signal, and the frequency converter is electrically connected to the pump body.

[0017] Preferably, a protective assembly is installed at the water inlet of the water inlet pipe, and the protective assembly includes a motor, a protective frame, a gear plate, a vertical plate, a bottom plate, a driven wheel, a driving wheel, a belt and a fixed plate installed on the water pump boat, the top of the fixed plate is penetrated by a connecting hole, the water inlet end of the water inlet pipe passes through the connecting hole and is fixedly installed with the fixed plate, the top of the fixed plate is threadedly connected with a plurality of fixing bolts in an annular array, and the top of the protective frame is fixedly installed with the bottom of the fixing plate by a plurality of fixing bolts.

[0018] Preferably, a reducer is fixedly connected to the bottom end of the motor, and the output end of the reducer is fixedly connected to the top of the driving wheel, the outer wall of the driving wheel is connected to the driven wheel through a belt, the bottom of the driven wheel is fixedly connected to the top of the gear plate, the top outer wall of the protective frame is rotatably connected to a gear ring, and the bottom outer wall of the protective frame is slidably connected to a slide plate, and the outer wall of the gear ring is meshed with the outer wall of the gear plate.

[0019] Preferably, a plurality of filter screens 1 are fixedly connected to a circular array on the outer wall of the protective frame, and a filter screen 2 is fixedly connected to the bottom of the protective frame, the top of the vertical plate is fixedly connected to the bottom of the gear ring, and the bottom of the vertical plate is fixedly connected to the top of the slide plate, scrapers are symmetrically fixedly connected to the two sides of the vertical plate, the bottom of the slide plate is fixedly connected to a base plate, and the bottom end of the motor is fixedly mounted to the top end of the fixed plate.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. In the present invention, the water supply method uses variable frequency speed control technology to match the rotation speed of the pump body with actual needs, and can flexibly adjust the water supply pressure and flow rate according to actual needs, thereby improving the stability and reliability of water supply. It is suitable for water supply systems of different scales. At the same time, the multi-pump collaborative working strategy ensures the efficient operation of each pump under different water supply needs, improves the reliability and stability of the entire water supply system, and reduces the risk of water outage due to pump failure or unreasonable operation. Soft start and variable frequency operation are adopted to reduce the starting impact and vibration of the pump body, reduce maintenance costs, and solve the problems of high energy consumption and unstable water supply in traditional water supply systems. While realizing energy-saving optimization and intelligent and safe operation of water intake pump ships, stable water supply from water intake pump ships is guaranteed.

[0022] 2. In the present invention, a protective component is added to the water inlet end of the water inlet pipe, and the stains and algae attached to the surface of the second filter are scraped and cleaned through the bottom plate. The scraper can scrape and clean the stains and algae attached to the surface of the first filter, thereby avoiding the accumulation of stains and the reproduction of algae on the first and second filters, avoiding the clogging of the filters, and improving the water intake effect of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of a variable frequency speed regulating device in a variable frequency speed regulating constant pressure water supply method for a water intake pump ship of the present invention;

[0024] Figure 2 It is a structural schematic diagram of a protective component of a flexible variable frequency speed regulation constant pressure water supply method for a water intake pump ship of the present invention;

[0025] Figure 3 It is a schematic diagram of the top view of the structure of the protection component of a flexible variable frequency speed regulation constant pressure water supply method for a water intake pump ship of the present invention;

[0026] Figure 4 It is a front sectional view of a protective component of a flexible variable frequency speed regulation constant pressure water supply method for a water intake pump boat of the present invention.

[0027] In the figure: 1. pump body; 2. water inlet pipe; 3. water outlet pipe; 4. frequency converter; 5. controller; 6. protection component; 7. pressure sensor; 8. flow sensor; 9. water level sensor; 61. fixing plate; 62. motor; 64. fixing bolt; 65. protection frame; 66. filter screen 1; 67. connecting hole; 68. gear plate; 69. gear ring; 610. vertical plate; 611. scraper; 612. slide plate; 613. filter screen 2; 614. bottom plate; 615. driven wheel; 616. driving wheel; 617. reducer; 618. belt. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the implementation regulations described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Example 1: Reference Figure 1 As shown: A flexible variable frequency speed regulation constant pressure water supply method for water intake pump boat, comprising the following steps:

[0030] Data collection and analysis strategy: By installing a variable frequency speed control device on the water intake pump boat, the variable frequency speed control device monitors the water level changes, water supply pressure and water supply flow in real time through multiple sets of sensors. The multiple sets of sensors transmit the collected data to the central control unit;

[0031] The variable frequency speed regulating device includes a pump body 1, a water inlet pipe 2, a water outlet pipe 3, a frequency converter 4, a controller 5 and a water level sensor 9 installed on a water intake pump boat, one end of the water outlet pipe 3 is fixedly connected to a pressure sensor 7, and one end of the water outlet pipe 3 is fixedly connected to a flow sensor 8, the frequency converter 4 is electrically connected to the controller 5, the pressure sensor 7 and the flow sensor 8 are both signal-connected to the controller 5, and the frequency converter 4 is electrically connected to the pump body 1;

[0032] Establishing a correlation model strategy: Based on the big data analysis algorithm, the central control unit analyzes and learns the historical water level data, water flow data in different periods, and the corresponding pump operation parameter data to establish a correlation model of water level-flow-pressure-pump operation parameters;

[0033] Frequency conversion speed control strategy: Based on historical water use data and real-time flow data, the central control unit predicts water demand forecast data. At the same time, according to the water pressure signal and water demand forecast data fed back by the sensor, the central control unit adjusts the output frequency of the frequency conversion equipment and changes the speed of the water pump. The higher the output frequency of the frequency converter 4, the higher the outlet pressure of the pump station. By selecting the optimal output frequency, the water supply pressure can be guaranteed and the pressure can be prevented from being too high, thus achieving energy saving and consumption reduction;

[0034] The central control unit tracks the deviation between the pipe network pressure and the given pressure in real time, calculates the pump speed adjustment value required to meet the constant pressure water supply through internal calculation methods, and uses vector control technology to adjust the output frequency of the frequency conversion equipment to perform frequency conversion speed regulation on the frequency conversion equipment;

[0035] Multi-pump collaborative working strategy: When the water supply system of the water pump ship is powered on, the frequency conversion device controls the soft start and frequency conversion operation of the first water pump according to the initial water level and estimated water demand, that is, the first water pump is started at a lower frequency, and the frequency is gradually increased to make the first water pump run smoothly until it is close to the target operating point, so as to avoid the impact of excessive starting current on the power grid and equipment. If the output frequency of the frequency conversion device rises to the preset upper limit and the water pressure of the output main cannot reach the set value, then after a delay, the first water pump is switched to the industrial frequency main drive, and the second water pump is started for frequency conversion operation, and so on, until the water pressure of the output main reaches the set value;

[0036] During the operation of the water pump boat, when the water level rises or the water demand decreases, resulting in increased pressure, the frequency conversion device reduces the operating frequency of the water pump. Conversely, when the water level drops or the water demand peaks, the pressure decreases, and the frequency conversion device increases the operating frequency of the water pump. At the same time, the proportional-integral control algorithm is used to perform real-time feedback adjustment on the pressure deviation, adjust the speed of the water pump, and stabilize the water supply pressure within the allowable error range of the set value.

[0037] The central control unit controls the switching point of adding pumps and closing pumps to not switch at the set value. The set value minus a preset value is the pressure judgment point for adding pumps, and the set value plus a preset value is the pressure judgment point for reducing pumps, so as to prevent repeated pump addition and pump closing caused by the different motor output powers of the inverter drive and the mains drive. At the same time, during the decompression process, the output of the frequency conversion device should be controlled at the preset frequency before the water pump is decompressed, and the preset frequency value can be set according to the actual situation, so as to prevent the water pressure from dropping or even stopping due to the switching of the pump driven by the main power supply during the pump decompression process;

[0038] When a single pump cannot meet the water supply demand or is in a low-efficiency operating range, the central control unit automatically starts the backup pump according to the pump's performance curve and current operating conditions. When multiple pumps are running, a dynamic load distribution algorithm is used to reasonably distribute the load according to the actual operating efficiency and remaining capacity of each pump, so that each pump can work in a high-efficiency range to avoid overload or inefficient operation of individual pumps. When the water demand decreases and the pump needs to be stopped, the central control unit will give priority to stopping the pump with low operating efficiency or close to the fault warning state, and maintain constant pressure water supply by adjusting the operating frequency of the remaining pumps. During the pump switching process, soft start and soft stop technology are used to achieve smooth switching of the pump and reduce water hammer effect and pressure fluctuations.

[0039] Dual constant pressure control strategy: When a fire occurs and the fire button switch is pressed, the central control unit reads the fire button switch signal and immediately controls another constant pressure setting value to start the fire water pressure to meet the fire fighting needs in the event of a fire.

[0040] In this embodiment, the water supply method of the present invention, through the correlation model established by the data acquisition and analysis system, can predict the water supply demand under different working conditions in advance, provide a basis for accurate pump control, and improve the adaptability of the water supply system to complex working condition changes; through variable frequency speed control, the rotation speed of the pump body 1 is matched with the actual demand, avoiding the throttling power loss and electricity waste in the traditional water supply system, and through the integrated control of the pressure sensor 7 and the frequency converter 4, constant pressure water supply is achieved, and the stability and reliability of the water supply are improved; at the same time, the multi-pump collaborative working strategy ensures the efficient operation of each pump under different water supply demands, improves the reliability and stability of the entire water supply system, and reduces the risk of water outage due to pump failure or unreasonable operation. The water supply method of the present invention can flexibly adjust the water supply pressure and flow according to actual needs, and is suitable for water supply systems of different scales, using soft Starting and frequency conversion operation reduce the starting impact and vibration of the pump body 1, extend the service life of the pump body 1, reduce maintenance costs, and solve the problems of high energy consumption and unstable water supply in traditional water supply systems; through this water supply method, the water supply can be accurately and stably controlled to reduce the water intake cost. At the same time, advanced frequency conversion speed regulation and constant pressure water supply control technology is adopted to improve the working efficiency of the water intake pump ship, reduce energy consumption, and reduce operating costs. While realizing energy-saving optimization and intelligent and safe operation of the water intake pump ship, it ensures stable water supply from the water intake pump ship, promotes the construction of integrated large-scale water supply projects, solves the drinking water problem in rural areas of various towns, and ensures the long-term safety of rural drinking water supply and rural population. This water supply method has broad application prospects in the fields of agricultural irrigation, industrial production water use, and emergency water supply and disaster prevention such as droughts and floods, and has great economic and social benefits.

[0041] Embodiment 2: Figure 1-Figure 4As shown, a protective assembly 6 is installed at the water inlet of the water inlet pipe 2, and the protective assembly 6 includes a motor 62, a protective frame 65, a gear plate 68, a vertical plate 610, a bottom plate 614, a driven wheel 615, a driving wheel 616, a belt 618 and a fixing plate 61 installed on the water pump boat, the top of the fixing plate 61 is penetrated with a connecting hole 67, the water inlet end of the water inlet pipe 2 passes through the connecting hole 67 and is fixedly installed with the fixing plate 61, the top of the fixing plate 61 is threadedly connected with a plurality of fixing bolts 64 in an annular array, the top of the protective frame 65 is fixedly installed with the bottom of the fixing plate 61 through a plurality of fixing bolts 64, the bottom end of the motor 62 is fixedly connected with a reducer 617, and the output end of the reducer 617 is fixedly connected with the top of the driving wheel 616, and the outer wall of the driving wheel 616 is through-threaded. The belt 618 is connected to the driven wheel 615, the bottom of the driven wheel 615 is fixedly connected to the top of the gear plate 68, the top outer wall of the protective frame 65 is rotatably connected to the gear ring 69, and the bottom outer wall of the protective frame 65 is slidably connected to the slide plate 612, the outer wall of the gear ring 69 is meshed with the outer wall of the gear plate 68, the outer wall of the protective frame 65 is fixedly connected to multiple filter screens 66 in a circular array, and the bottom of the protective frame 65 is fixedly connected to filter screen 2 613, the top of the vertical plate 610 is fixedly connected to the bottom of the gear ring 69, and the bottom of the vertical plate 610 is fixedly connected to the top of the slide plate 612, the scrapers 611 are symmetrically fixedly connected on both sides of the vertical plate 610, the bottom of the slide plate 612 is fixedly connected to the bottom plate 614, and the bottom end of the motor 62 is fixedly installed on the top of the fixed plate 61.

[0042] In this embodiment, the protection assembly 6 is fixed on the water pump boat through the fixing plate 61, and the water inlet end of the water inlet pipe 2 is located in the protection frame 65. When the device is in use, the motor 62 drives the driving wheel 616 to rotate through the reducer 617, and the driving wheel 616 drives the driven wheel 615 and the bottom gear plate 68 to rotate through the belt 618. The outer wall of the gear plate 68 is meshed with the outer wall of the gear ring 69, so the gear plate 68 can drive the gear ring 69 to rotate along the outer wall of the protection frame 65, and the gear ring 69 drives the vertical plate 610 and the two The side scraper 611 rotates along the outer side of the protective frame 65, and at the same time drives the slide plate 612 to slide along the outer edge of the bottom end of the protective frame 65. The bottom plate 614 can scrape and clean the stains and algae attached to the surface of the filter screen 2 613, and the scraper 611 can scrape and clean the stains and algae attached to the surface of the filter screen 1 66, avoiding the accumulation of stains and the reproduction of algae on the filter screen 1 66 and the filter screen 2 613, avoiding the clogging of the filter screen, improving the fluidity of water when taking water at the water inlet of the device, and improving the water intake effect of the device.

[0043] The use method and working principle of the device: The variable frequency speed regulation constant pressure water supply method for water intake pump boats of the present invention can be divided into data collection and analysis strategy, association model establishment strategy, variable frequency speed regulation control strategy, multi-pump collaborative work strategy, and dual constant pressure control strategy. First, multiple groups of sensors are installed on the water intake pump boat, including a water level sensor 9 (for real-time monitoring of water level changes in the water area), a pressure sensor 7 (installed on the outlet pipe 3, for monitoring water supply pressure), and a flow sensor 8 (for measuring water supply flow). These sensors transmit the collected data to the central control unit of the controller 5. After the central control unit receives the monitoring data of multiple groups of sensors, it establishes a water level-flow-pressure-pump based on the big data analysis algorithm. The associated model of operating parameters is used to quickly determine the appropriate pump operation strategy under different working conditions; when the water supply method is applied to a water intake pump boat, and when it is applied to a large-amplitude water intake project, for a large-amplitude water intake project with large water level fluctuations, the parameter design of the water intake pump boat, such as the rotation speed and valve opening, is flexibly adjusted according to the water level changes and water intake demand, allowing it to be moved and repositioned when necessary, and according to the target water volume and target pressure required for stable water supply, a high-efficiency water pump and power system are selected to output the best water pump opening combination and the corresponding speed ratio. Through the above-mentioned flexible adjustment of the variable frequency speed regulation constant pressure water supply design scheme, the energy-saving design and scheduling optimization of the water intake floating boat are realized under the premise of meeting the stable water supply of the large-amplitude water intake project;

[0044] The water supply method of the present invention matches the rotation speed of the pump body 1 with the actual demand through variable frequency speed control, thus avoiding the throttling power loss and power waste in the traditional water supply system. The integrated control of the pressure sensor 7 and the frequency converter 4 realizes constant pressure water supply, thus improving the stability and reliability of the water supply. At the same time, the multi-pump collaborative working strategy ensures the efficient operation of each pump under different water supply demands, thus improving the reliability and stability of the entire water supply system, and reducing the risk of water outage due to pump failure or unreasonable operation. The water supply method of the present invention can flexibly adjust the water supply pressure and flow rate according to actual needs, and is suitable for water supply systems of different sizes. The soft start and variable frequency operation are adopted to reduce the starting impact and vibration of the pump body 1, extend the service life of the pump body 1, reduce the maintenance cost, and solve the problems of high energy consumption and unstable water supply in the traditional water supply system.

[0045] At the same time, a protective component 6 is added to the water inlet end of the water inlet pipe 2 in the water supply method of the present invention, and the stains and algae attached to the surface of the filter screen 2 613 are scraped and cleaned through the bottom plate 614. The scraper 611 can scrape and clean the stains and algae attached to the surface of the filter screen 1 66, avoiding the accumulation of stains and the reproduction of algae on the filter screen 1 66 and the filter screen 2 613, avoiding the clogging of the filter screen, and improving the water intake effect of the device.

[0046] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A flexible variable frequency speed regulation constant pressure water supply method for water intake pump boat, characterized in that: The following steps are involved: Data collection and analysis strategy: By installing a variable frequency speed control device on the water intake pump boat, the variable frequency speed control device monitors the water level changes, water supply pressure and water supply flow in real time through multiple sets of sensors. The multiple sets of sensors transmit the collected data to the central control unit; Establishing a correlation model strategy: Based on the big data analysis algorithm, the central control unit analyzes and learns the historical water level data, water flow data in different periods, and the corresponding pump operation parameter data to establish a correlation model of water level-flow-pressure-pump operation parameters; Variable frequency speed control strategy: Based on historical water use data and real-time flow data, the central control unit predicts water demand forecast data. At the same time, according to the water pressure signal and water demand forecast data fed back by the sensor, the central control unit adjusts the output frequency of the variable frequency equipment and changes the speed of the water pump; Multi-pump collaborative working strategy: When the water supply system of the water pump ship is powered on, the frequency conversion device controls the soft start and frequency conversion operation of the first water pump according to the initial water level and estimated water demand, that is, the first water pump is started at a lower frequency, and the frequency is gradually increased to make the first water pump run smoothly until it is close to the target operating point. If the output frequency of the frequency conversion device rises to the preset upper limit and the water pressure of the output main pipe cannot reach the set value, then after a delay, the first water pump is switched to the industrial frequency main drive, and the second water pump is started for frequency conversion operation, and so on, until the water pressure of the output main pipe reaches the set value; Dual constant pressure control strategy: When a fire occurs and the fire button switch is pressed, the central control unit reads the fire button switch signal and immediately controls another constant pressure setting value to start the fire water pressure.

2. The flexible variable frequency speed regulation constant pressure water supply method for water intake pump boat according to claim 1 is characterized in that: In the variable frequency speed control strategy, the central control unit tracks the deviation change between the pipe network pressure and the given pressure position in real time, and calculates the pump speed adjustment value required to meet the constant pressure water supply through an internal calculation method, and uses vector control technology to adjust the output frequency of the variable frequency equipment to perform variable frequency speed regulation on the variable frequency equipment.

3. The flexible variable frequency speed regulation constant pressure water supply method for water intake pump boat according to claim 2 is characterized in that: In the multi-pump collaborative working strategy, during the operation of the water pump boat, when the water level rises or the water demand decreases, causing the pressure to increase, the frequency conversion device reduces the operating frequency of the water pump. Conversely, when the water level drops or the pressure decreases during the peak water demand, the frequency conversion device increases the operating frequency of the water pump. At the same time, the pressure deviation is adjusted in real time through real-time feedback through the proportional-integral control algorithm, and the speed of the water pump is adjusted to stabilize the water supply pressure within the allowable error range of the set value.

4. The flexible variable frequency speed regulation constant pressure water supply method for water intake pump boat according to claim 3 is characterized in that: In the multi-pump collaborative working strategy, the central control unit controls the switching points of adding pumps and closing pumps to not switch at the set value, and the set value minus a preset value is the pressure judgment point for adding pumps, and the set value plus a preset value is the pressure judgment point for reducing pumps. During the decompression process, the output of the frequency conversion device should be controlled at a preset frequency before the water pump is decompressed, and the preset frequency value can be set according to actual conditions.

5. The flexible variable frequency speed regulation constant pressure water supply method for water intake pump boat according to claim 4 is characterized in that: In the multi-pump collaborative working strategy, when a single pump cannot meet the water supply demand or is in a low-efficiency operating range, the central control unit automatically starts the standby pump according to the pump's performance curve and current operating conditions. When multiple pumps are in operation, a dynamic load distribution algorithm is used to reasonably distribute the load according to the actual operating efficiency and remaining capacity of each pump, so that each pump can operate in a high-efficiency range. When the water demand decreases and the pump needs to be stopped, the central control unit gives priority to stopping the pump with low operating efficiency or close to a fault warning state, and maintains constant pressure water supply by adjusting the operating frequency of the remaining pumps. During the pump switching process, soft start and soft stop technology are used to achieve smooth switching of the pump.

6. The flexible variable frequency speed regulation constant pressure water supply method for water intake pump boat according to claim 1 is characterized in that: The variable frequency speed regulating device comprises a pump body (1), a water inlet pipe (2), a water outlet pipe (3), a frequency converter (4), a controller (5) and a water level sensor (9) installed on a water intake pump boat, one end of the water outlet pipe (3) is fixedly connected to a pressure sensor (7), and one end of the water outlet pipe (3) is fixedly connected to a flow sensor (8), the frequency converter (4) is electrically connected to the controller (5), the pressure sensor (7) and the flow sensor (8) are both signal-connected to the controller (5), and the frequency converter (4) is electrically connected to the pump body (1).

7. The flexible variable speed variable constant pressure water supply method for water intake pump boat according to claim 6 is characterized in that: A protective assembly (6) is installed at the water inlet of the water inlet pipe (2), and the protective assembly (6) comprises a motor (62), a protective frame (65), a gear plate (68), a vertical plate (610), a bottom plate (614), a driven wheel (615), a driving wheel (616), a belt (618) and a fixing plate (61) installed on the water pump boat, wherein a connecting hole (67) is provided through the top of the fixing plate (61), and the water inlet end of the water inlet pipe (2) passes through the connecting hole (67) and is fixedly installed with the fixing plate (61), and a plurality of fixing bolts (64) are threadedly connected in an annular array at the top of the fixing plate (61), and the top of the protective frame (65) is fixedly installed with the bottom of the fixing plate (61) through the plurality of fixing bolts (64).

8. The flexible variable frequency speed regulation constant pressure water supply method for water intake pump boat according to claim 7 is characterized in that: The bottom end of the motor (62) is fixedly connected to a reducer (617), and the output end of the reducer (617) is fixedly connected to the top of the driving wheel (616), the outer wall of the driving wheel (616) is connected to the driven wheel (615) via a belt (618), the bottom of the driven wheel (615) is fixedly connected to the top of the gear plate (68), the top outer wall of the protective frame (65) is rotatably connected to a gear ring (69), and the bottom outer wall of the protective frame (65) is slidably connected to a slide plate (612), and the outer wall of the gear ring (69) is meshed with the outer wall of the gear plate (68).

9. The flexible variable frequency speed regulation constant pressure water supply method for water intake pump boat according to claim 8 is characterized in that: The outer wall of the protection frame (65) is fixedly connected to a plurality of filter screens 1 (66) in an annular array, and the bottom of the protection frame (65) is fixedly connected to filter screen 2 (613), the top of the vertical plate (610) is fixedly connected to the bottom of the gear ring (69), and the bottom of the vertical plate (610) is fixedly connected to the top of the slide plate (612), the two sides of the vertical plate (610) are symmetrically fixedly connected to scrapers (611), the bottom of the slide plate (612) is fixedly connected to a bottom plate (614), and the bottom end of the motor (62) is fixedly mounted to the top of the fixed plate (61).

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