CN111733924B - Distributed light-load shutdown variable-frequency water supply system with tail end energy storage function - Google Patents
Distributed light-load shutdown variable-frequency water supply system with tail end energy storage function Download PDFInfo
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B1/00—Methods or layout of installations for water supply
- E03B1/02—Methods or layout of installations for water supply for public or like main supply for industrial use
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B11/00—Arrangements or adaptations of tanks for water supply
- E03B11/10—Arrangements or adaptations of tanks for water supply for public or like main water supply
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B7/00—Water main or service pipe systems
- E03B7/02—Public or like main pipe systems
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B7/00—Water main or service pipe systems
- E03B7/07—Arrangement of devices, e.g. filters, flow controls, measuring devices, siphons or valves, in the pipe systems
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B7/00—Water main or service pipe systems
- E03B7/07—Arrangement of devices, e.g. filters, flow controls, measuring devices, siphons or valves, in the pipe systems
- E03B7/072—Arrangement of flowmeters
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B7/00—Water main or service pipe systems
- E03B7/07—Arrangement of devices, e.g. filters, flow controls, measuring devices, siphons or valves, in the pipe systems
- E03B7/077—Arrangement of backflow preventing devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
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Abstract
The application relates to a frequency conversion water supply system is shut down to underload of terminal energy storage of distributing type, and this system includes: at least one tail end pressure storage unit and at least one light-load shutdown variable-frequency water supply unit; the tail end pressure storage unit is used for providing sufficient shutdown pressure storage water supply capacity for the water supply system; and the light-load shutdown variable-frequency water supply unit is used for performing constant-pressure water supply or light-load shutdown on a water supply system. The technical scheme provided by the application avoids the idle work done when the water supply system is in no load and the low-efficiency working state when the water supply system is in light load, greatly improves the operating efficiency of the water supply system, saves a large amount of electric energy, and simultaneously prolongs the service life of the water supply system.
Description
Technical Field
The utility model belongs to the technical field of water supply equipment, concretely relates to distributing type end energy storage's underloading shuts down frequency conversion water supply system.
Background
The frequency conversion water supply system is widely applied to a secondary pressurization water supply system by virtue of unique constant-pressure water supply characteristics, however, since the frequency conversion water supply technology is born, the problem that the system is not stopped when the system is unloaded (water is not used) is always troubled, and the large and medium frequency conversion water supply systems in the society are not stopped every 24 hours and 365 days every year, so that huge electric energy waste is caused.
According to the characteristics of the water pump, when the flow is 0 (no load), the efficiency of the water pump is 0, the real-time power of the water pump is about 40% of the rated power (related to the performance of the water pump and the set water pressure), and a large amount of electric energy is wasted because the water pump is not stopped for a long time when no load is carried out.
In addition, the water pump is not an ideal acting device, the real-time efficiency of the water pump changes along with the flow change, the water pump efficiency is very low when the water pump supplies water at a small flow (light load), and if the water pump works for a long time and inefficiently, a large amount of electric energy is wasted.
Disclosure of Invention
In order to overcome the useless function that frequency conversion water supply system did when empty and the low efficiency operating condition when lightly carrying, this application provides a distributing type end energy storage's light load and shuts down frequency conversion water supply system.
According to a first aspect of the embodiments of the present application, there is provided a distributed end energy storage light-load shutdown variable-frequency water supply system, the system including: at least one tail end pressure storage unit and at least one light-load shutdown variable-frequency water supply unit;
the tail end pressure storage unit is used for providing shutdown pressure storage water supply capacity for the water supply system;
and the light-load shutdown variable-frequency water supply unit is used for performing constant-pressure water supply or light-load shutdown on the water supply system.
Further, the tip pressure storage unit includes:
pressure storage tank, manometer and relief valve.
Further, according to the law of conservation of hydrodynamic energy and the Boyle's law, the pressure storage tank is arranged at the tail end of the water supply system and is used for improving the potential energy of pressure storage water supply, reducing the pressure potential energy and furthest improving the pressure storage water supply capacity of the shutdown of the water supply system;
the pressure gauge is connected with the pressure storage tank and used for displaying the working pressure value of the pressure storage tank;
the safety valve is connected with the pressure storage tank and used for carrying out overload pressure relief on the pressure storage tank.
Further, the light-load shutdown variable-frequency water supply unit comprises: the device comprises a first valve, a water pump, a check valve, a second valve, a pressure sensor and a light-load shutdown frequency converter;
a water outlet of a water storage tank of the water supply system, a first valve, a water pump, a check valve and a second valve are sequentially connected with a main pipeline of the water supply system through pipelines;
a pressure sensor is arranged between the second valve and a main pipeline of the water supply system and is used for acquiring the current water supply pressure value;
the light-load shutdown frequency converter is respectively connected with the pressure sensor and the water pump and is used for adjusting the working frequency of the water pump.
Further, the light-load shutdown frequency converter comprises:
the starting module is used for judging whether the current water supply pressure value is less than or equal to the restarting water pressure after the water supply system is powered on or shut down under light load, and if the current water supply pressure value is less than or equal to the restarting water pressure, the system is started slowly, and then the system enters the constant-pressure water supply module or the light-load shutdown module; if the current water supply pressure value is larger than the restart water pressure, no operation is performed;
the constant-pressure water supply module is used for PID adjustment of the working frequency of the water pump after the water supply system is started, and stabilizing the current water supply pressure value to be the set water pressure;
the light-load shutdown module is used for judging whether the working frequency of the water pump is less than or equal to the light-load frequency or not during the constant-pressure water supply period, and if the current working frequency of the water pump is less than or equal to the light-load frequency, the PID adjusts the working frequency of the water pump until the current water supply pressure value is increased to be shutdown water pressure, and the water supply system is slowly shut down; if the working frequency of the water pump is higher than the light load frequency, constant-pressure water supply is kept.
Further, the light-load shutdown variable-frequency water supply unit further comprises: the flowmeter is used for acquiring the current water supply flow;
the flowmeter is arranged at the tail end of a main pipeline of the water supply system.
Further, the light load shutdown module is further configured to:
during the constant-pressure water supply period, judging whether the current water supply flow is less than or equal to the light-load flow, if the current water supply flow is less than or equal to the light-load flow, regulating the working frequency of the water pump by PID until the current water supply pressure value is increased to be the shutdown water pressure, and slowly shutting down the water supply system; if the current water supply flow is larger than the light load flow, constant-pressure water supply is kept.
Further, the light-load shutdown frequency converter further comprises:
the first acquisition module is used for acquiring light load flow according to the capacity of the pressure storage tank;
and the second acquisition module is used for acquiring the shutdown water pressure and the restart water pressure according to the set water pressure.
Further, the first obtaining module includes:
a first calculation submodule for determining a pressure-storing water-supplying capacity Vcy of the ith pressure-storing tank in accordance with the following formulai：
A second calculation submodule for determining a total pressure-storing water-supplying capacity Vcy of all the pressure-storing tanks in accordance with the following formula:
a third calculation submodule for determining the light load flow Qqz according to the following equation:
in the above formula, i is belonged to [1, n ∈]N is the total number of the pressure storage tanks; viIs the capacity of the ith pressure storage tank, HiThe height of the installation position of the ith pressure storage tank relative to the light-load shutdown variable-frequency water supply unit is shown, P' is set water pressure, and delta P1To restart the differential pressure, Δ P2For shutdown pressure differential, Vcy is the total pressure storage water supply capacity for all pressure storage tanks, Ttj is the light load shutdown time.
Further, the second obtaining module includes:
a fourth calculation submodule for determining the shut-down water pressure P "according to:
P″＝P′+ΔP2
a fifth calculation submodule for determining the restart water pressure according to the following equation:
P″′＝P′-ΔP1
in the above formula, P' is the set water pressure, Δ P2For differential pressure at shutdown, Δ P1To restart the pressure differential.
The technical scheme provided by the embodiment of the application can have the following beneficial effects: the tail end pressure storage unit provides shutdown pressure storage water supply capacity for the water supply system, and simultaneously can better stabilize the instantaneous water pressure of the system; on one hand, idle work done by a water supply system in no-load and low-efficiency working state in light load are avoided, and the power saving efficiency of the water supply system is improved; on the other hand, since the operation time of the water supply system is greatly reduced, the service life of the water supply system is improved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.
FIG. 1 is a schematic diagram of a distributed end-stored light-load shutdown variable frequency water supply system according to an exemplary embodiment;
FIG. 2 is a schematic diagram of another distributed end-stored light-load shutdown variable frequency water supply system according to an exemplary embodiment;
FIG. 3 is a schematic diagram illustrating the construction of another distributed end-stored light-load shutdown variable frequency water supply system according to an exemplary embodiment;
FIG. 4 is a schematic structural diagram of a light-load shutdown variable-frequency water supply unit in another distributed end-stored light-load shutdown variable-frequency water supply system according to an exemplary embodiment;
in FIG. 3, 1-water pump, 2-check valve, 3-second valve, 4-frequency converter, 5-pressure sensor, 6-flowmeter, 10-water supply pipeline vertical bar, 11-water using equipment, 12-safety valve, 13-pressure storage tank, 14-pressure gauge, 15-main pipeline of water supply system, 16-first valve, 17-water storage tank of water supply system;
in fig. 4, 1-water pump, 2-check valve, 3-second valve, 4-frequency converter, 5-pressure sensor, 6-flowmeter, 15-main pipe of water supply system, 16-first valve, 17-water storage tank of water supply system.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.
Fig. 1 is a schematic structural diagram of a distributed end-stored energy light-load shutdown variable-frequency water supply system according to an exemplary embodiment. Referring to fig. 1, the system includes:
at least one tail end pressure storage unit and at least one light-load shutdown variable-frequency water supply unit;
the tail end pressure storage unit is used for providing shutdown pressure storage water supply capacity for a water supply system;
and the light-load shutdown variable-frequency water supply unit is used for performing constant-pressure water supply or light-load shutdown on a water supply system.
According to the distributed light-load shutdown variable-frequency water supply system with the tail end storing energy, the shutdown pressure-storing water supply capacity is provided for the water supply system through the pressure-storing unit, and meanwhile, the instantaneous water pressure of the system can be better stabilized; on one hand, idle work done by a water supply system in no-load and low-efficiency working state in light load are avoided, and the electricity-saving efficiency of the water supply system is greatly improved; on the other hand, the service life of the water supply system is greatly prolonged due to the fact that the running time of the water supply system is greatly reduced.
As an improvement of the foregoing embodiment, an embodiment of the present invention provides another distributed end-stored energy light-load shutdown variable-frequency water supply system, as shown in fig. 2, including: at least one tail end pressure storage unit and at least one light-load shutdown variable-frequency water supply unit;
the tail end pressure storage unit is used for providing shutdown pressure storage water supply capacity for a water supply system;
and the light-load shutdown variable-frequency water supply unit is used for performing constant-pressure water supply or light-load shutdown on a water supply system.
Further optionally, the terminal pressure storage unit includes:
pressure storage tank, manometer and relief valve.
Specifically, optionally, the pressure storage tank is arranged at the tail end of the water supply system and is used for improving the potential energy of pressure storage water supply, reducing the pressure potential energy and increasing the shutdown pressure storage water supply capacity of the system as much as possible;
the pressure gauge is connected with the pressure storage tank and used for displaying the working pressure value of the pressure storage tank;
the safety valve is connected with the pressure storage tank and used for carrying out overload pressure relief on the pressure storage tank.
It should be noted that the end of the water supply system refers to the highest floor for supplying water, and the pressure storage tank is preferably installed at two floors above the end floor, and if no space is available, the pressure storage tank can be installed at one floor above the end or the same floor at the end; the potential energy of pressure storage water supply is further increased, the pressure potential energy of the pressure storage tank is reduced, namely the working pressure of the pressure storage tank is reduced, the pressure storage water supply capacity (the same pressure storage pressure difference) can be increased to the maximum extent, but the lowest working pressure of the pressure storage tank is more than or equal to 1 Ba.
The specific installation position of the pressure storage tank can be adjusted by a person skilled in the art according to the engineering requirement.
Further optionally, the light-load shuts down the frequency conversion water supply unit, includes: the device comprises a first valve, a water pump, a check valve, a second valve, a pressure sensor and a light-load shutdown frequency converter;
a water outlet of a water storage tank of the water supply system, a first valve, a water pump, a check valve and a second valve are sequentially connected with a main pipeline of the water supply system through pipelines;
a pressure sensor is arranged between the second valve and a main pipeline of the water supply system and is used for acquiring the current water supply pressure value;
the light-load shutdown frequency converter is respectively connected with the pressure sensor and the water pump and used for adjusting the working frequency of the water pump.
In some embodiments, when there are two or more light-load shutdown variable-frequency water supply units, one light-load shutdown variable-frequency water supply unit works, and the rest can be cooperated and backed up.
It is easy to understand that when two or more frequency conversion water supply units are needed, the frequency converters in each frequency conversion water supply unit should be connected with each other in a communication way; the frequency converters may be connected to each other by, but not limited to, a communication cable (e.g., 485 communication cable).
For example, if there is only one light-load shutdown variable-frequency water supply unit, the light-load shutdown variable-frequency water supply unit can operate normally (for example, as shown in fig. 3, a schematic structural diagram of a distributed end-energy-storing light-load shutdown variable-frequency water supply system);
as shown in fig. 4, if there are two light-load shutdown variable-frequency water supply units, a system backup is formed and the two units work together; the two water pumps work alternately to back up each other, and when the water pressure of the system is insufficient in a water consumption peak period, the backup machine can work in a cooperative manner to adjust the water pressure to a set water pressure;
in the preferred scheme, three light-load shutdown variable-frequency water supply units A, B, C are provided, the power of the water pump in the unit A is low, the power of the water pumps in the other two units B, C is high and is half of the total power of the system design, and the three units work cooperatively and back up each other; the unit A is a host machine and finishes small-flow water supply and light-load shutdown work; the units B and C are auxiliary machines, and when the system flow is larger than the rated flow of the water pump of the unit A, the unit B works in a cooperative mode to ensure the water pressure and the flow of the water supply system; when the flow exceeds the rated flow of A, B units, C immediately participates in the cooperative work to ensure the water pressure and flow of the water used in the peak period; the scheme meets the light-load shutdown energy-saving function, simultaneously plays the characteristic of high efficiency of the low-power pump in small flow, further improves the energy-saving efficiency of the system, and simultaneously the system can realize safe backup.
Further optionally, the light-load shutdown frequency converter includes:
the first acquisition module is used for acquiring light load flow according to the capacity of the pressure storage tank;
the second acquisition module is used for acquiring the shutdown water pressure and the restart water pressure according to the set water pressure;
the starting module is used for judging whether the current water supply pressure value is less than or equal to the restarting water pressure or not after the water supply system is powered on or the water supply system is shut down under light load, and if the current water supply pressure value is less than or equal to the restarting water pressure, the system is started slowly and enters the constant-pressure water supply module or the light-load shutdown module; if the current water supply pressure value is larger than the restart water pressure, no operation is performed;
the constant-pressure water supply module is used for PID adjustment of the working frequency of the water pump after the water supply system is started, and stabilizing the current water supply pressure value to be the set water pressure;
the light-load shutdown module is used for judging whether the working frequency of the water pump is less than or equal to the light-load frequency or not during the constant-pressure water supply period, and if the current working frequency of the water pump is less than or equal to the light-load frequency, the PID adjusts the working frequency of the water pump until the current water supply pressure value is increased to be shutdown water pressure, and the water supply system is slowly shut down; if the working frequency of the water pump is higher than the light load frequency, constant-pressure water supply is kept.
In some optional embodiments, the frequency converter further includes an analog-to-digital conversion module, configured to convert the current water supply pressure value collected by the pressure sensor into a mode recognizable by the frequency converter.
It is easy to understand that the current water supply pressure value collected by the pressure sensor is transmitted to the frequency converter.
In some alternative embodiments, the light-load shutdown frequency conversion function can be realized by controlling a general frequency converter through a special light-load shutdown constant-pressure water supply controller, which can be, but is not limited to, a programmable logic controller.
It should be noted that, the person skilled in the art can set the magnitudes of the "set water pressure", the "shut-down water pressure" and the "restart water pressure" according to the engineering requirements.
In some embodiments, the frequency converter adjusts the operating frequency of the water pump by using a PID algorithm, and the manner of "the frequency converter adjusts the operating frequency of the water pump by using a PID algorithm" is well known to those skilled in the art, and therefore, the specific implementation manner thereof will not be described too much.
Specifically, optionally, in some embodiments, the first obtaining module includes:
a first calculation submodule for determining a pressure-storing water-supplying capacity Vcy of the ith pressure-storing tank in accordance with the following formulai：
A second calculation submodule for determining a total pressure-storing water-supplying capacity Vcy of all the pressure-storing tanks in accordance with the following formula:
a third calculation submodule for determining the light load flow Qqz according to the following equation:
in the above formula, i is belonged to [1, n ∈]N is the total number of the pressure storage tanks; viIs the capacity of the ith pressure storage tank, HiThe height of the installation position of the ith pressure storage tank relative to the variable-frequency water supply unit is P', the set water pressure is delta P1To restart the differential pressure, Δ P2For shutdown pressure differential, Vcy is the total pressure storage water supply capacity for all pressure storage tanks, Ttj is the light load shutdown time.
It should be noted that the magnitudes of the "restart pressure difference" and the "shutdown pressure difference" can be set by those skilled in the art according to engineering requirements.
It should be noted that, those skilled in the art can set the light load time according to actual needs, expert experience, experimental data, and the like; in some embodiments, the light load time may be, but is not limited to, 10 minutes or greater.
It should be noted that the set light-load shutdown time refers to a shutdown time for supplying water at a light-load flow all the time after the system is shutdown, and the actual shutdown time is determined by a water flow after the system is shutdown, for example, the water is rarely used at night, and the actual light-load shutdown time may be several hours.
It should be noted that "10" in the formula of the first calculation submodule means a pressure 1Ba of 10 meters of water.
It should be noted that, the pressure storage water supply capacity of the water supply system is continuously increased, and the energy saving efficiency of the water supply system can be further improved.
In some embodiments, the light load flow rate may be, but is not limited to, sized to be one third or one fourth of the rated flow rate of the water pump; specifically, a person skilled in the art can set the light load flow to be one-N of the rated flow of the water pump according to engineering needs, expert experience, experimental data or user requirements; when the light-load flow is set, the total pressure storage and water supply capacity of all the pressure storage tanks can be reversely deduced according to the formula, and the capacity of each pressure storage tank is designed according to the number of the pressure storage tanks, the installation positions of the pressure storage tanks, the shutdown water pressure, the restart water pressure and the like.
Specifically, optionally, in some embodiments, the second obtaining module includes:
a fourth calculation submodule for determining the shutdown water pressure P "according to:
P″＝P′+ΔP2
a fifth calculation submodule for determining the restart water pressure according to the following equation:
P″′＝P′-ΔP1
in the above formula, P' is the set water pressure, Δ P2For differential pressure at shutdown, Δ P1To restart the pressure differential.
For example, after the water supply system is started slowly, the constant-pressure water supply module in the frequency converter adjusts the working frequency of the water pump through the PID until the current water supply pressure value is the set water pressure; when the working frequency of the frequency converter is less than or equal to the light-load frequency, the water supply system enters a light-load shutdown state: firstly, a light-load shutdown module in a frequency converter adjusts the working frequency of a water pump through PID (proportion integration differentiation) to enable the current water supply pressure value to be increased to shutdown water pressure, then a water supply system is slowly shut down, after shutdown, the water pressure of the system is gradually reduced to restart water pressure along with continuous water use of a user, the system is restarted, and after the system is started, whether the water supply system is in light-load shutdown or constant-pressure water supply is determined according to the working frequency of the water pump.
In some embodiments, the light load frequency may be obtained by: firstly, determining that the light-load flow of the system is one third of the rated flow of the water pump, determining the capacity, the quantity and the installation position of the pressure storage tanks, then calculating the pressure storage and water supply capacity of each pressure storage tank according to the restart water pressure and the shutdown water pressure, accumulating the pressure storage and water supply capacity of all the pressure storage tanks to obtain the total pressure storage and water supply capacity of the water supply system, and calculating Qqz that the theoretical light-load flow is more than or equal to the light-load flow of the system according to the total pressure storage and water supply capacity of the water supply system and the light-load shutdown time; after all parts of the system are installed, a flowmeter for testing is installed at the tail end of a main pipeline of the water supply system, the water supply system is started, the flow of the water supply system is adjusted to be equal to the light-load flow, the working frequency of the water pump is the light-load frequency value at the moment, the frequency value is set to the light-load frequency parameter of the light-load shutdown frequency converter, and the water supply system can work normally.
And (3) testing the system, adjusting the flow of the system to be equal to the light-load flow when the system normally works, stopping the system under the light load when the working frequency of the system is less than or equal to the light-load frequency, and keeping the flow of the water unchanged, wherein if the light-load stopping time is more than or equal to 10Min, the system is tested to be qualified.
It should be noted that, the light-load shutdown variable-frequency water supply unit does not need to be provided with a flowmeter, and the flowmeter is only used as system installation and debugging equipment, so that the economic cost is reduced.
Further optionally, the light-load shuts down the frequency conversion water supply unit, still includes: the flowmeter is used for acquiring the current water supply flow;
the flowmeter is arranged at the tail end of a main pipeline of the water supply system.
Further optionally, the light load shutdown module is further configured to:
judging whether the current water supply flow is less than or equal to the light-load flow, if the current water supply flow is less than or equal to the light-load flow, regulating the working frequency of the water pump by the PID until the current water supply pressure value is increased to be the shutdown water pressure, and slowly shutting down the system; if the current water supply flow is larger than the light load flow, constant-pressure water supply is kept.
For example, after water supply system slowly started, the constant pressure water supply module passes through PID adjustment water pump's operating frequency, stabilizes current water supply pressure value for setting for water pressure, detects the water supply flow simultaneously, and when current water supply flow was less than or equal to the light load flow, the system got into the light load shutdown state: firstly, the working frequency of a water pump is adjusted through PID to raise the water pressure to the shutdown water pressure, and then the system is slowly shut down; after the system is stopped, the water supply system is restarted when the water pressure of the system is gradually reduced to the restart water pressure along with the continuous water use of a user, and after the system is started, whether the system is continuously stopped under light load or continuously supplied with constant pressure is determined according to the real-time flow;
it should be noted that the flowmeters have the problem of enabling the flow velocity, namely, the lowest detection flow velocity converts the enabling flow velocity into the enabling flow according to the sectional area of the main pipeline; in order to prevent the light-load shutdown water supply system from entering a control blind area, a flowmeter which enables the flow rate to be lower than the light-load flow rate of the system must be selected.
It can be easily understood that, as can be seen from the above, the variable-frequency water supply unit has two structural components, one with a flowmeter and the other without a flowmeter, so that the light-load shutdown frequency converter has two control modes; one skilled in the art can choose whether to use a flow meter based on engineering needs.
According to the other distributed type light-load shutdown variable-frequency water supply system with tail end energy storage provided by the embodiment of the invention, the shutdown pressure storage water supply capacity is provided for the water supply system through the tail end pressure storage unit, so that the instantaneous water pressure of the system can be better stabilized; by the light-load shutdown function of the light-load variable-frequency water supply unit, on one hand, the idle work of the water supply system in no-load and the low-efficiency working state of the water supply system in light load are avoided, and the energy-saving efficiency of the water supply system is greatly improved; on the other hand, the service life of the water supply system is prolonged by times because the running time of the water supply system is greatly reduced;
according to the other distributed type light-load shutdown variable-frequency water supply system with tail end energy storage, provided by the embodiment of the invention, the pressure storage tank is arranged at each tail end of water supply, so that high-pressure potential energy and low-potential energy of a water pump are converted into high-potential energy and low-pressure potential energy (energy conservation law, kinetic energy is ignored in a shutdown state); the same working pressure difference and lower working pressure can improve the pressure storage and water supply capacity (Boyle's law) of the pressure storage tank with the same capacity, thereby providing enough light load flow for a water supply system; when the current water supply flow of the water supply system is less than or equal to the light-load flow, the water supply system enters a light-load shutdown state, and the pressure storage water supply capacity provides the system water flow for a period of time;
the variable-frequency water supply system can continuously work only when the current water supply flow is greater than the light-load flow or the working frequency of the water pump is greater than the light-load frequency, when the water supply system is in an idle load and light-load state, the system water pump is a short-time high-efficiency energy storage and long-time low-flow water supply mode, idle work done when the system is in the idle load state and a low-efficiency working state when the system is in the light load state are avoided, the power saving efficiency of the system is greatly improved, the service life of the system is prolonged because the running time of the system is greatly reduced, in addition, the instantaneous water pressure of the system is stabilized by adopting better pressure storage at the tail end, and the phenomenon of instable water pressure caused by the delay of PID adjustment is avoided;
the distributed light-load shutdown variable-frequency water supply system with the tail end storing energy provided by the invention solves the problem that the existing variable-frequency water supply system does not shut down every 24 hours and every 365 days to cause huge waste of electric energy. For example, except for morning and noon water peak hours, the system is basically in a light-load shutdown state, and is in a shutdown state all the time when no people use water at night; except for the peak water consumption in the morning, the noon and the evening, the residential area is mostly in the light-load shutdown state at other times, and is basically in the light-load shutdown state at night, so that the system running time is greatly reduced, and the energy-saving efficiency of the system is improved.
The light-load shutdown frequency converter is also suitable for a light-load shutdown constant-voltage variable-frequency gas supply system, and the pressure storage tank can be arranged at the tail end or the front end due to the fact that gas has no potential energy. The light-load shutdown constant-pressure variable-frequency air supply system can realize high-quality constant-pressure air supply (the existing variable-pressure air supply system has large start-stop pressure difference and few constant-pressure air supplies, and because the constant-pressure air supply also has the problem of no-load shutdown, the frequency converter only solves the problems of slow start of a high-power motor and large flow of power failure), and can realize high efficiency and energy conservation.
It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.
It should be noted that, in the description of the present application, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Further, in the description of the present application, the meaning of "a plurality" means at least two unless otherwise specified.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and the scope of the preferred embodiments of the present application includes other implementations in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present application.
It should be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present application may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.
Claims (2)
1. The utility model provides a frequency conversion water supply system is shut down to underload of terminal energy storage of distributing type which characterized in that, the system includes: at least one tail end pressure storage unit and at least one light-load shutdown variable-frequency water supply unit;
the tail end pressure storage unit is used for providing shutdown pressure storage water supply capacity for the water supply system;
the light-load shutdown variable-frequency water supply unit is used for performing constant-pressure water supply or light-load shutdown on the water supply system;
the terminal pressure storage unit includes:
the pressure storage tank, the pressure gauge and the safety valve;
according to the law of conservation of hydrodynamic energy and the Boyle's law, the pressure storage tank is arranged at the tail end of the water supply system and is used for improving the potential energy of pressure storage water supply, reducing the pressure potential energy and improving the pressure storage water supply capacity;
the pressure gauge is connected with the pressure storage tank and used for displaying the working pressure value of the pressure storage tank;
the safety valve is connected with the pressure storage tank and is used for carrying out overload pressure relief on the pressure storage tank;
the light-load shutdown variable-frequency water supply unit comprises: the device comprises a first valve, a water pump, a check valve, a second valve, a pressure sensor and a light-load shutdown frequency converter;
a water outlet of a water storage tank of the water supply system, a first valve, a water pump, a check valve and a second valve are sequentially connected with a main pipeline of the water supply system through pipelines;
a pressure sensor is arranged between the second valve and a main pipeline of the water supply system and is used for acquiring the current water supply pressure value;
the light-load shutdown frequency converter is respectively connected with the pressure sensor and the water pump and is used for adjusting the working frequency of the water pump;
the light-load shutdown frequency converter comprises:
the starting module is used for judging whether the current water supply pressure value is less than or equal to the restarting water pressure when the water supply system is powered on or is shut down under light load, and if the current water supply pressure value is less than or equal to the restarting water pressure, the system is started slowly, and then the system enters the constant-pressure water supply module or the light-load shutdown module; if the current water supply pressure value is larger than the restart water pressure, no operation is performed;
the constant-pressure water supply module is used for PID adjustment of the working frequency of the water pump after the water supply system is started, stabilizing the current water supply pressure value to be set water pressure and keeping constant-pressure water supply;
the light-load shutdown module is used for judging whether the working frequency of the water pump is less than or equal to the light-load frequency or not during the constant-pressure water supply period, and if the current working frequency of the water pump is less than or equal to the light-load frequency, the PID adjusts the working frequency of the water pump until the current water supply pressure value is increased to be shutdown water pressure, and the water supply system is slowly shut down; if the working frequency of the water pump is greater than the light load frequency, constant-pressure water supply is kept;
the light-load shutdown variable-frequency water supply unit further comprises: the flowmeter is used for acquiring the current water supply flow;
the flowmeter is arranged at the tail end of a main pipeline of the water supply system;
the light load shutdown module is further configured to:
judging whether the current water supply flow is less than or equal to the light-load flow, if the current water supply flow is less than or equal to the light-load flow, regulating the working frequency of the water pump by the PID until the current water supply pressure value is increased to be the shutdown water pressure, and slowly shutting down the water supply system; if the current water supply flow is larger than the light-load flow, constant-pressure water supply is kept;
the light-load shutdown frequency converter further comprises:
the first acquisition module is used for acquiring light load flow according to the capacity of the pressure storage tank;
the second acquisition module is used for acquiring the shutdown water pressure and the restart water pressure according to the set water pressure;
the first obtaining module includes:
a first calculation submodule for determining a pressure-storing water-supplying capacity Vcy of the ith pressure-storing tank in accordance with the following formulai：
A second calculation submodule for determining a total pressure-storing water-supplying capacity Vcy of all the pressure-storing tanks in accordance with the following formula:
a third calculation submodule for determining the light load flow Qqz according to the following equation:
in the above formula, i is belonged to [1, n ∈]N is the total number of the pressure storage tanks; viIs the capacity of the ith pressure storage tank, HiThe height of the installation position of the ith pressure storage tank relative to the light-load shutdown variable-frequency water supply unit is shown, P' is set water pressure, and delta P1To restart the differential pressure, Δ P2For shutdown pressure differential, Vcy is the total pressure storage water supply capacity for all pressure storage tanks, Ttj is the light load shutdown time.
2. The system of claim 1, wherein the second obtaining module comprises:
a fourth calculation submodule for determining the shut-down water pressure P "according to:
P″＝P′+ΔP2
a fifth calculation submodule for determining the restart water pressure according to the following equation:
P″′＝P′-ΔP1
in the above formula, P' is the set water pressure, Δ P2For differential pressure at shutdown, Δ P1To restart the pressure differential.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102926433A (en) * | 2012-10-18 | 2013-02-13 | 上海凯泉泵业（集团）有限公司 | Air pressure water supply system |
| JP2015025427A (en) * | 2013-07-26 | 2015-02-05 | 株式会社荏原製作所 | Feed water supply system |
| CN205205908U (en) * | 2015-12-03 | 2016-05-04 | 漯河恒义达电气设备有限公司 | Variable -frequency and constant -pressure water supply system |
| CN110565735A (en) * | 2019-09-30 | 2019-12-13 | 湖南省大成水务发展有限责任公司 | Variable pressure water supply equipment with high-level energy storage and intelligent sensing functions |
-
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- 2020-06-08 CN CN202010510593.1A patent/CN111733924B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102926433A (en) * | 2012-10-18 | 2013-02-13 | 上海凯泉泵业（集团）有限公司 | Air pressure water supply system |
| JP2015025427A (en) * | 2013-07-26 | 2015-02-05 | 株式会社荏原製作所 | Feed water supply system |
| CN205205908U (en) * | 2015-12-03 | 2016-05-04 | 漯河恒义达电气设备有限公司 | Variable -frequency and constant -pressure water supply system |
| CN110565735A (en) * | 2019-09-30 | 2019-12-13 | 湖南省大成水务发展有限责任公司 | Variable pressure water supply equipment with high-level energy storage and intelligent sensing functions |
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