I. Introduction

 

With the growth of the national economy and the increase in people's material requirements, in daily life, it has derived a way of small closed-loop secondary pressurization of the municipal pipeline network by buildings, so that high-rise building groups can also achieve the purpose of normal water use. A small-scale closed-loop constant pressure water supply environment.

 

2. Overview

 

Constant pressure water supply equipment is composed of air pressure tanks, multi-stage water pumps, electrical control and pipe network hardware facilities and feedback systems. Its outstanding advantages are that there is no need to build water towers, small investment, less land occupation, flexible and simple layout, and quick completion and commissioning . The use of water and gas automatic adjustment, automatic operation, energy saving and tap water municipal pipe network connection, water can still be provided when the second power is received, without the convenience of secondary debugging and personnel supervision. It is widely used in the production, living and office water supply of enterprises, residential areas and rural areas.

 

Three, working principle

 

Constant pressure water supply equipment adopts pneumatic water supply. The use of sealed tanks and the use of high-pressure gas in the tank to buffer the pump-stop water hammer effect achieve the purpose of system water supply safety. The specific working sequence is that the multi-stage water pump presses the water into the tank body and the pipe network through the check valve, so that the gas in the tank is compressed and the pressure gradually increases. When the pipe network pressure reaches the specified upper limit, the multi-stage water pump will be automatically stopped by feeding back the pressure gauge to the control cabinet to ensure the purpose of constant pressure water supply. The water pressure in the equipment is higher than the pressure of the external pipe network, and water is automatically sent to the water supply pipe network. When the pressure in the pipe network drops to the specified lower limit position, the feedback pressure gauge will restart the multi-stage pump through the control cabinet. This is repeated so that the pipe network maintains a constant pressure and continuously supplies water.

 

Fourth, the advantages of using easy-drive GT200 inverter

 

1. Large starting torque, normal starting at full load;

 

2. High, medium and low speeds in the whole process, stable speed;

 

3. No stall or no flow during acceleration and deceleration;

 

4. Wide speed range (0-550HZ arbitrary adjustment);

 

5. The low-frequency starting torque is large enough to start the fan smoothly;

 

6. The parameter setting is simple, the default V/F can meet the production needs;

 

7. Install protective cover, with strong environmental adaptability;

 

8. Built-in standard configuration process PI self-adjustment;

Concluding remarks

 

Easydrive GT200 inverter has been successfully applied in major buildings, fire inspections, and industrial and mining enterprises across the country. Its superior performance (large low-frequency torque, wide speed range, high steady-state accuracy, flexible and convenient operation, and complete functional protection. The closed-loop PI process is smooth, the adjustment speed is fast, etc.) and its high reliability has been praised by customers, which fully meets the constant pressure water supply process requirements of various properties.