Constant-pressure water supply system

Abstract

The invention relates to a constant-pressure water supply system which is used for enabling network pipe water pressure for water supply to be kept at a constant value. The constant-pressure water supply system comprises a frequency converter, a water pump and a pressure sensor, the pressure sensor is arranged at the position of an outlet of a network pipe and used for sensing actual pressure of outlet water of the network pipe and feeding an acquired parameter back to the frequency converter; the frequency converter is used for comparing the parameter fed back by the pressure sensor and a set value, the difference value of the parameter and the set value is converted into a frequency through calculation, the frequency should be output by the frequency converter at present, and the output frequency is used for regulating rotation speed of an asynchronous motor in the water pump; the water pump is driven by the asynchronous motor to rotate so as to supply water, and the rotation speed of the asynchronous motor is regulated through the frequency output by the frequency converter. The constant-pressure water supply system has the advantages of being high in reliability, high in anti-interference capacity, flexible in combination, simple to program, convenient to maintain, low in cost and the like. The constant-pressure water supply system is good in energy conservation and good in use effect and meets the requirements of actual use.

Description

technical field [0001] The invention relates to a constant pressure water supply system, in particular to a constant pressure water supply system realized by using PLC control technology and frequency conversion speed regulation technology. Background technique [0002] With the rapid development of social economy, the continuous expansion of urban construction scale, the increase of population and the continuous improvement of people's living standards, higher and higher requirements are put forward for the quantity, quality and stability of urban water supply. However, my country is a country short of water resources and electric energy. For a long time, the technology in municipal water supply and community water supply, especially in county and township water supply, has been relatively backward and the degree of automation is low. However, the configuration of the automatic control system of the old water plant is relatively backward, and the control of the unit mainly ...

AI Technical Summary

Problems solved by technology

[0004] 1. The pressurized water supply method of the constant speed pump cannot respond to the pressure of the water supply network in a timely manner. Low power consumption, and when the water consumption is small, the network management system is in the overpressure operation state for a long time, the phenomenon of explosion is serious, and the hard start of the motor is easy to produce water hammer effect, which is very destructive, so it is rarely used at present

[0005] 2. The water supply of the high-level water tank of the water tower has the advantages of simple control mode, economical and reasonable operation, short-term maintenance or power failure, etc., but there are large infrastructure investment, large floor area, inconvenient maintenance, hard start of the water pump motor, and large starting current And other disadvantages, frequent starting is easy to damage the coupling, currently only used in high-rise buildings

[0006] 3. The air pressure tank water supply has the characteristics of small size, simple technology, and no height restriction, etc., but this method has small adjustment, the water pump motor is hard-started and starts frequently, the requirements for electrical equipment are high, and the system maintenance workload is large. Reduce the number of starts of the water pump, and the pressure of stopping the pump is often relatively high, causing the water pump to work in the low-efficiency section, and the water outlet pressure increases unnecessarily, which also increases waste and limits its development.

[0007] 4. The water supply mode of hydraulic clutch and battery slip clutch speed regulation is prone to oil leakage, heat generation needs cooling, low efficiency, and troublesome transformation. It can only be driven one-to-one and requires frequent maintenance.

[0008] 5. The single-chip microcomputer frequency conversion speed regulation water supply system can also achieve frequency conversion speed regulation, and the degree of automation is better than the above four water supply methods, but the system development cycle is relatively long, the requirements for the quality of the operator are relatively high, the reliability is relatively low, and maintenance is not easy. Convenient and not suitable for harsh industrial environments

[0009] To sum up, the existing water supply methods generally waste water power and electric power resources to varying degrees; efficiency frequency conversion speed regulation constant pressure water supply technology has been widely used in the water supply industry for its advantages of energy saving, safety, and high-quality water supply.

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