Water hammer eliminating control method

Abstract

The invention discloses a water hammer eliminating control method. The water hammer eliminating control method includes the following steps that (1) a power source is connected, electric pump pressure is set, an electric pump is started by a controller; (2) a variable voltage and variable frequency module outputs a signal to a PWM output power module; (3) the PWM output power module outputs voltage to control the electric pump to conduct rotating speed adjustment; (4) a sampling module samples pressure sampling values of the electric pump before pulse injection and after pulse injection and conveys the values to an MCU processor; and (5) the MCU processor sets a comparison value, the MCU processor judges the absolute value of a difference value of the pressure sampling values of the electric pump before pulse injection and after pulse injection and a comparison value to correspondingly control the electric pump. By means of the water hammer eliminating control method, under the condition that a pressure tank is not needed, a water hammer in the system can be eliminated, the system cost and the follow-up maintaining cost can be reduced, the problem caused by using the pressure tank is solved, and the problem of water quality secondary pollution is solved.

Description

technical field [0001] The invention relates to the field of electric pumps, in particular to an intelligent control method for an electric pump with a controller. Background technique [0002] With the continuous improvement of people's living standards, the increasing maturity of frequency conversion technology, the continuous reduction of costs, and the emergence of energy-saving effects, more and more people are using frequency conversion and constant pressure water supply, which can not only improve people's water demand and quality of life, but also realize Energy saving effect. [0003] Generally, electric pumps equipped with frequency converters use frequency conversion controllers to cooperate with pressure tanks and check valves to control electric pumps, so as to realize functions such as eliminating water hammer impact and shutting down electric pumps. At present, small power electric pumps below 2.2kw on the market generally use pressure tanks, pressure switche...

AI Technical Summary

Problems solved by technology

[0026] The bladder in the bladder pressure tank is sealed by flanges. The electric pump water supply system will experience slow air leakage and even water leakage under the conditions of mechanical vibration, environmental temperature changes and repeated pressure changes.

In addition, in the case of hot water use, water leakage and air leakage caused by accelerated skin aging will also occur, causing the system to work abnormally, failing to reduce water hammer and buffer pressure normally, and even electric pumps. Phenomena such as unable to shut down

Not only can't achieve energy saving effect, but also may affect the normal use of customers

In addition, generally large-scale centralized water supply systems are managed and maintained by special personnel, and pressure testing and re-invigoration are required every 6 months or 1 year. For users with low power (generally below 2.2Kw), there is generally no special personnel Maintenance will bring a lot of inconvenience to subsequent use. Generally, when a problem occurs, it is dealt with by direct replacement, and the maintenance cost is also high.

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