Secondary water supply system based on bag type pressure stabilization and water supply control method thereof

Abstract

The secondary water supply system comprises a water inlet main pipe, a water outlet main pipe, a control cabinet, an electric valve, a plurality of water supply main pumps, a water inlet pressure sensor, a water outlet pressure sensor and an electromagnetic flowmeter, wherein the electric valve, the water supply main pumps, the water inlet pressure sensor, the water outlet pressure sensor and the electromagnetic flowmeter are electrically connected with the control cabinet. The water inlet manifold is provided with a water inlet pressure sensor, the water outlet manifold is provided with a water outlet pressure sensor and an electromagnetic flowmeter, and the water outlet manifold is connected with a user pipe network; an electric valve and a plurality of water supply main pumps are subsequently connected in parallel with the water inlet header pipe; the bag type energy storage unit comprises a rubber bag and a miniature deep-well pump, the rubber bag is used for storing energy and stabilizing pressure, and the miniature deep-well pump is connected with the electric valve; and the micro deep-well pump and the plurality of water supply main pumps are connected to the water outlet main pipe. The invention further discloses a water supply control method of the secondary water supply system based on bag type pressure stabilization, and the water supply control method is suitable for meeting the requirements for efficient pressure stabilization and low-noise water supply under the night small-flow working condition.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of secondary water supply, and relates to an intelligent water supply system linked with an electric valve through a capsule energy storage structure, in particular to a secondary water supply system based on capsule pressure stabilization and a water supply control method thereof, and the system is suitable for efficient pressure stabilization and low-noise water supply demand under the condition of small flow at night. BACKGROUND

[0002] Secondary water supply refers to the form that units or individuals store, pressurize and supply city public water or self-built water supply to users or self-use through pipelines. The secondary water supply is mainly established to compensate for the lack of municipal water supply pipeline pressure and guarantee water use of people living in high-rise buildings.

[0003] The traditional secondary water supply system faces the following technical defects during the night low water consumption period. (1) Insufficient pressure stabilization capacity: frequent start and stop of the main pump cause pipeline pressure fluctuation (±0.15 MPa), which easily causes "water hammer effect" and leads to systematic risk of pump house pipeline.

[0004] (2) High energy consumption: conventional secondary water supply equipment adopts water pumps of unified specifications and models, and the normal power is large, and the comprehensive efficiency is still low (comprehensive efficiency < 30% (actual measurement data)) when the frequency control is at low flow, which leads to high power consumption and poor economy.

[0005] (3) Noise pollution: conventional water supply equipment adopts water pumps of unified specifications and models, and the low-frequency noise of high-power water pumps is high, which is normally more than 55 dB(A), and cannot meet the quietness requirement at night in residential areas, and affects the life of residents. Therefore, the application provides an intelligent pressure stabilization system and control strategy combining a capsule and a pump. SUMMARY

[0006] In view of the defects and deficiencies in the existing water supply technology, the purpose of the application is to provide a secondary water supply system based on capsule pressure stabilization and a water supply control method thereof, and the system is silent and energy-saving during night operation, and is an inevitable choice to replace the traditional water supply scheme.

[0007] In order to achieve the above-mentioned application purpose, the technical scheme adopted by the patent is: The secondary water supply system based on the capsule type pressure stabilization comprises a water inlet main pipe, a water outlet main pipe, a control cabinet, an electric valve, a plurality of water supply main pumps, a water inlet pressure sensor, a water outlet pressure sensor and an electromagnetic flowmeter electrically connected with the control cabinet respectively; the water inlet pressure sensor is arranged on the water inlet main pipe, the water outlet pressure sensor and the electromagnetic flowmeter are arranged on the water outlet main pipe, and the water outlet main pipe is connected with a user pipe network; the water inlet main pipe is connected in parallel with the electric valve and the plurality of water supply main pumps in sequence; the capsule type energy storage unit comprises a rubber capsule and a micro deep well pump, the rubber capsule is connected with the water outlet main pipe and used for energy storage and pressure stabilization, and the micro deep well pump is connected with the electric valve; and the micro deep well pump and the plurality of water supply main pumps are connected to the water outlet main pipe.

[0008] Further, the capsule type energy storage unit is divided into two regions, the high-pressure region is provided with the rubber capsule, the pressure resistance grade of the rubber capsule is 1.6 MPa, and the micro deep well pump is arranged in another region, the rated power of the micro deep well pump is ≤1.1 kW, and the micro deep well pump is used for small flow at night.

[0009] Further, the micro deep well pump is provided with a frequency conversion controller, and the speed regulation range is 10% to 100%.

[0010] Further, the micro deep well pump is integrated at the bottom of the capsule type energy storage unit.

[0011] Further, the water inlet pressure sensor of the water inlet main pipe and the water outlet pressure sensor of the water outlet main pipe constitute a closed loop PID regulation.

[0012] Further, the electric valve is a normally closed electric valve.

[0013] The method for water supply control by using the secondary water supply system based on the capsule type pressure stabilization according to any one of the above comprises a small flow water supply night mode: when the parameter of the electromagnetic flowmeter of the water outlet pipeline is less than or equal to 1 / 3 of the rated flow of one water supply main pump, the electromagnetic flowmeter feeds back the flow signal to the control cabinet, and it is determined to execute the night water supply mode; at this time, the PLC controller in the control cabinet opens the electric valve, the micro deep well pump operates, the water outlet main pipe pressurizes the rubber capsule to store energy to Pmax, and after the energy storage is completed, the rubber capsule is switched to pressure stabilization, and the micro deep well pump is dormant.

[0014] Further, the rubber capsule first supplements water and stabilizes pressure, and when the pressure is reduced to Pmax-0.05, the PLC controller controls the micro deep well pump to operate until the pipeline pressure reaches Pmax.

[0015] Further, the frequency conversion adjustment of the micro deep well pump is started, and the outlet pressure is maintained constant at P_set±0.02 MPa.

[0016] Further, the method further comprises a large-flow water supply daytime mode: when the parameter of the electromagnetic flowmeter of the water outlet pipeline is greater than or equal to the rated flow of one water supply main pump, the electromagnetic flowmeter feeds back a flow signal to the control cabinet, and it is determined to execute the daytime mode; the PLC controller in the control cabinet closes the water inlet side electric valve, the plurality of water supply main pumps are operated, the water outlet main pipe pressurizes the rubber capsule to store energy to Pmax, the pressure signal is fed back to the control cabinet by the water outlet pressure sensor, and the PLC control in the control cabinet closes the water supply main pump; after the energy storage is completed, switching to rubber capsule pressure stabilization is performed, and the water supply main pump enters hibernation.

[0017] The secondary water supply system based on capsule pressure stabilization and the water supply control method thereof have the following beneficial effects: (1) The night small-flow pressure stabilization capability is improved, a small deep well pump is used for water pump pressure stabilization at night, and the water hammer effect generated by the secondary water supply system is small.

[0018] (2) The conventional secondary water supply equipment adopts a unified specification and model water pump, the normal power is large, the comprehensive efficiency of frequency conversion control is still low at small flow, the power consumption is relatively high, and the economy is poor. The present application saves energy and reduces consumption: a micro deep well pump is used at night, the rated power of the micro deep well pump is less than or equal to 1.1 kW, and the energy consumption is small; and the micro deep well pump is provided with frequency conversion control, and the speed regulation range is 10-100%. In addition, whether during the day or at night, the pump is operated to pressurize the rubber capsule to store energy, after the energy storage is completed, switching to rubber capsule pressure stabilization is performed, and the pump hibernates, so that the energy consumption is smaller.

[0019] (3) The conventional water supply equipment all adopts a unified specification and model water pump, the low-frequency noise of the high-power water pump is high, which is normally more than 55 dB(A), cannot meet the night quiet requirement of residential areas, and affects the life of residents. The present application reduces noise: the power of the micro deep well pump is small, and the surrounding water environment and the double isolation of the tank body ensure low-noise operation at night, and do not affect the rest of the residents. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a schematic diagram of the secondary water supply system based on capsule pressure stabilization; Among them, 1, control cabinet, 2 micro deep well pump, 3, air tank partition, 4, capsule energy storage unit, 5, rubber capsule, 6, electric valve, 7, water supply main pump, 8, water inlet pressure sensor, 9, water inlet main pipe, 10, water outlet pressure sensor, 11, electromagnetic flowmeter, 12, water outlet main pipe. DETAILED DESCRIPTION

[0021] The present application will be further described in detail below in combination with the drawings and examples.

[0022] Referring to the drawings Figure 1As shown, the secondary water supply system based on bladder pressure stabilization of the embodiment includes a control cabinet 1, a bladder energy storage unit 4, an electric valve 6, a water supply main pump 7, an inlet water pressure sensor 8, an inlet water main 9, an outlet water pressure sensor 10, an electromagnetic flowmeter 11, and an outlet water main 12. The control cabinet 1 is electrically connected with the electric valve 6, the water supply main pump 7, the inlet water pressure sensor 8, the outlet water pressure sensor 10, and the electromagnetic flowmeter 11, respectively.

[0023] The inlet water pressure sensor 8 is arranged on the inlet water main 9, and the outlet water pressure sensor 10 and the electromagnetic flowmeter 11 are arranged on the outlet water main 12. The outlet water main 12 is connected with a user pipe network. The pressure feedback control is realized by the inlet water pressure sensor 8 of the inlet water main 9 and the outlet water pressure sensor 10 of the outlet water main 12.

[0024] The electric valve 6 and the water supply main pump 7 are connected in parallel after the inlet water main 9. The electric valve 6 on the inlet side is a normally closed electric valve, and the electric valve 6 is connected with the bladder energy storage unit 4.

[0025] Regarding the bladder energy storage unit 4: the bladder energy storage unit 4 is divided into two chambers. The high-pressure chamber is provided with a rubber energy storage area with a pressure resistance of 1.6 MPa, and a rubber bladder 5 is arranged in the chamber. The other chamber is connected with an inlet (the inlet water main 9) through the electric valve 6, and a micro deep-well pump 2 is arranged in the chamber.

[0026] The rated power of the micro deep-well pump 2 is ≤1.1 kW, which is used for small flow at night. The micro deep-well pump 2 is provided with a frequency conversion controller, and the speed range is 10%~100%. Preferably, the micro deep-well pump 2 is integrated at the bottom of the bladder energy storage unit 4.

[0027] The micro deep-well pump 2 and the water supply main pump 7 are connected to the outlet water main 12.

[0028] The process of water supply control by using the secondary water supply system based on bladder pressure stabilization of the embodiment is as follows: (1) Large flow water supply day mode: When the parameter of the electromagnetic flowmeter 11 of the outlet pipeline is greater than or equal to the rated flow of one water supply main pump 7, the electromagnetic flowmeter 11 feeds back the flow signal to the control cabinet 1, and it is determined to execute the day mode. At this time, the PLC controller in the control cabinet 1 executes, the inlet side electric valve 6 is closed, the water supply main pump 7 is simultaneously operated, the rubber bladder 5 air pressure tank is pressurized and stored to Pmax, the pressure signal is fed back to the control cabinet 1 by the outlet water pressure sensor 10, and the PLC control executor in the control cabinet 1 executes, the water supply main pump 7 is closed. After the energy storage is completed, the rubber bladder 5 is switched to pressure stabilization, and the water supply main pump 7 enters hibernation.

[0029] (2) Small flow water supply night mode: When the electromagnetic flowmeter 11 parameter of the outlet pipeline is less than or equal to 1 / 3 of the rated flow of a water supply main pump 7, the electromagnetic flowmeter 11 feeds a flow signal to the control cabinet 1, and it is determined to execute the night water supply mode. At this time, the PLC controller in the control cabinet 1 executes to open the water inlet side electric valve 6, and the micro deep well pump 2 runs (the frequency conversion adjustment of the micro deep well pump 2 in the starting capsule is started, the outlet pressure is maintained constant as P_set±0.02MPa), and the rubber capsule 5 air tank is pressurized to store energy to Pmax (the rubber capsule 5 is first step pressure stabilization, when the pressure is reduced to Pmax-0.05, the PLC controller controls the micro deep well pump 2 to run until the pipeline pressure reaches Pmax.); After the energy storage is completed, it is switched to the rubber capsule 5 pressure stabilization, and the micro deep well pump 2 is dormant.

[0030] At night, the rubber capsule 5 is preferentially used for water replenishment and pressure stabilization, and is suitable for night small flow water supply. The pressure is continuously reduced, and the micro deep well pump 2 is preferentially started. Since the micro deep well pump 2 has small power, and is double isolated by the surrounding water environment and the tank body, low noise operation at night is ensured, and the rest of the residents is ensured.

[0031] The above only describes the preferred example embodiments of the present application, and does not constitute a limitation on the protection scope of the present application. Any modification, equivalent replacement and improvement within the spirit and principle of the present application should be included in the protection scope of the claims of the present application.

Claims

1. A secondary water supply system based on bladder pressure stabilization, characterized by, The system comprises a water inlet main pipe, a water outlet main pipe, a control cabinet, an electric valve, a plurality of water supply main pumps, a water inlet pressure sensor, a water outlet pressure sensor and an electromagnetic flowmeter electrically connected with the control cabinet respectively; The water inlet pressure sensor is arranged on the water inlet main pipe, the water outlet pressure sensor and the electromagnetic flowmeter are arranged on the water outlet main pipe, and the water outlet main pipe is connected with a user pipe network; The water inlet main pipe is connected with the electric valve and the plurality of water supply main pumps in parallel subsequently; the capsule energy storage unit comprises a rubber capsule and a micro deep-well pump, the rubber capsule is connected with the water outlet main pipe and used for energy storage and pressure stabilization, and the micro deep-well pump is connected with the electric valve; The micro deep-well pump and the plurality of water supply main pumps are connected to the water outlet main pipe.

2. The pressure tank-based secondary water supply system according to claim 1, wherein The capsule energy storage unit is divided into two regions, the high-pressure region is provided with the rubber capsule, the pressure resistance grade of the rubber capsule is 1.6 MPa, and the micro deep-well pump is arranged in the other region, the rated power of the micro deep-well pump is less than or equal to 1.1 kW and used for small-flow use at night.

3. The pressure tank-based secondary water supply system according to claim 1 or 2, wherein The micro deep-well pump is provided with a frequency conversion controller, and the speed regulation range is 10% to 100%.

4. The pressure tank-based secondary water supply system according to claim 1 or 2, wherein The micro deep-well pump is integrated at the bottom of the capsule energy storage unit.

5. The pressure tank-based secondary water supply system according to claim 1 or 2, wherein The water inlet pressure sensor of the water inlet main pipe and the water outlet pressure sensor of the water outlet main pipe constitute a closed-loop PID regulation.

6. The pressure tank-based secondary water supply system according to claim 1 or 2, wherein The electric valve is a normally closed electric valve.

7. A method for water supply control using the capsule-based pressure-stabilized secondary water supply system according to any one of claims 1 to 6, characterized by, The method comprises a small-flow water supply night mode: When the parameter of the electromagnetic flowmeter of the water outlet pipeline is less than or equal to 1 / 3 of the rated flow of one water supply main pump, the electromagnetic flowmeter feeds back a flow signal to the control cabinet, and it is determined to execute the night water supply mode; At this time, the PLC controller in the control cabinet opens the electric valve, the micro deep-well pump operates, the water outlet main pipe pressurizes the rubber capsule to store energy to Pmax, after the energy storage is completed, the rubber capsule is switched to pressure stabilization, and the micro deep-well pump is dormant.

8. The method of claim 7, wherein, The rubber capsule first supplements water and stabilizes pressure, when the pressure is reduced to Pmax-0.05, the PLC controller controls the micro deep-well pump to operate until the pipeline pressure reaches Pmax.

9. The method of claim 7 or 8, wherein, The frequency conversion adjustment of the micro deep-well pump is started, and the outlet pressure is maintained constant at P_set±0.02 MPa.

10. The method of claim 7 or 8, wherein, The method further comprises a large-flow water supply daytime mode: When the parameter of the electromagnetic flowmeter of the water outlet pipeline is greater than or equal to the rated flow of one water supply main pump, the electromagnetic flowmeter feeds back a flow signal to the control cabinet, and it is determined to execute the daytime mode; The PLC controller in the control cabinet closes the electric valve on the water inlet side, the plurality of water supply main pumps operate, the water outlet main pipe pressurizes the rubber capsule to store energy to Pmax, the pressure signal is fed back to the control cabinet by the water outlet pressure sensor, the PLC controller in the control cabinet closes the water supply main pump, after the energy storage is completed, the rubber capsule is switched to pressure stabilization, and the water supply main pump enters dormancy.

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