With the development of urban construction, the number of new residential quarters is increasing, and the pressure on the municipal water supply network is low, which often fails to meet the pressure requirements of the district water supply. The pressure of the traditional water supply is usually set to store the clear water pool, first put the water of the water supply pipe network into the clear water pool, and then use a pressure pump to supply water from the clear water pool to the user. However, this method has the problem of waste of energy consumption and secondary pollution of water quality. This is not economically justified in terms of engineering construction, operation management, reliability of water supply, and technical content. With the development of new technologies, the construction of artificial intelligent pumping stations in residential communities to achieve unattended and remote centralized monitoring of pumping stations is an inevitable development trend of pump station design management. In recent years, the municipal water supply pipe network directly takes over pressure to reduce energy consumption and avoid secondary pollution of water quality, and the pump station has achieved safe and reliable automatic control through intelligent non-negative pressure equipment. The use of pipe network residual pressure in the terminal terminal inlet pipe for pipeline pressurization is to benefit from these conditions, only the basis for its development. Based on the advantages of no negative pressure pumping station in residential areas and the current situation of urban development towards internationalization and modern metropolis, it has created a good opportunity for the promotion and application of municipal non-negative pressure equipment.
I. Operation status of no negative pressure water supply equipment in the community
A sample survey was conducted on the configuration and operation of pump houses in more than 50 residential quarters in Qingdao, and 32 pumping stations were inspected on site. The current operating conditions are good. After tracking the technical quality, it is believed that the two mainstream products currently in use in the community have their own characteristics. For example, the Kangshan Villa uses the products of the A factory, and the water supply mode: no negative pressure water supply equipment; Quality of water supply: secondary water supply is non-polluting, water quality is good, constant pressure control is adopted, water supply pressure is stable, and adjustment ability is strong; fully enclosed structure; single-chip control, self-made single-chip stability and reliability to be verified, equipment maintenance is not universal. The Zhongxing Community uses the products of Factory B. It uses PLC programmable control technology, which has strong versatility and convenient maintenance. It means that the pressure difference setting is too small, resulting in frequent start and stop of the pump, machine loss and energy waste. It can be considered that the inlet water setting value can be automatically set to different size values ​​according to the user and the water flow rate.
Second, the analysis of product advantages combined with the surveyed community in the actual situation of the above products, from the scope of use, when the water pressure of the municipal pipe network is stable (mainly the diameter of the inlet pipe is large), but when the water pressure is not high enough, Both options are generally applicable to pressurized water supply to the pipe network. The merits of the solution depend more on the quality of the corresponding electromechanical equipment. However, for the booster pump station with the pipe network tip and the inlet pipe diameter less than DN300, the instantaneous water pressure fluctuation of the pipe network caused by the water supply is large due to the design of the airbag without buffering water pressure.
(1) Technical aspects: Plant A adopts steady flow compensation preloading balance technology, vacuum suppression technology, air partition technology and negative pressure feedback technology to achieve no negative pressure. The whole system is completed by computer fuzzy control SDF technology. When the pressure of the tap water is insufficient to cause the pressure to drop, the equipment collects the water quantity and pressure signal through the detection device in the system, and feedbacks in real time, through the microcomputer control, automatically adjusts, suppresses the negative pressure generation of the pipe network, and ensures that the device does not have any influence on the urban pipe network. . The B manufacturer is an ordinary air supply type, and a vacuum eliminator is installed on the tank. According to the change of the liquid level in the tank, the air is removed and released by means of opening and closing to eliminate the vacuum. Its water supply control also uses ordinary variable frequency constant voltage control technology. In the automatic control function of the system, the products of the above two companies can fully control the equipment, and no special personnel are required to be on duty. The A plant has no negative pressure pipe network pressurized steady flow water supply equipment can simulate the human brain intelligent technology operation. The equipment of these products generally have various protection functions such as overvoltage, overcurrent, overload, waterless water, voice alarm, etc.; and can be equipped with remote monitoring and monitoring system according to user needs, and some soft faults can be eliminated by remote monitoring; The monitoring center can also remotely control the start and stop of the device. In short, the above two products can realize remote transmission through wired or wired internet, etc., generally have the following functions: communication and collection of pump station data; alarm management; database generation; data forwarding, accident recall; print output, statistics Analysis; monitoring, manual re-recording, system definition and maintenance, signal management, remote setting of parameters for each pump station, etc. Among them, the pump station of Company A is equipped with a display system and an industrial computer to realize display and supervision. Company B chooses to configure and supervise by configuring the host computer.
(2) Equipment configuration: The two companies use Grundfos stainless steel pumps, which will not pollute the water quality. Grundfos pumps have low operating vibration, low noise, good performance, high quality, long service life, low power (current), small motor capacity, high operating efficiency; full mechanical seal dripping without leakage; safe and reliable operation, and beautiful appearance, Exquisite processing technology and other advantages. Domestic pumps are inefficient, high noise, high power, design level and processing technology are incomparable. The A equipment control system adopts the non-negative pressure professional software controlled by the industrial control microcomputer to realize the automatic control of the automatic unattended operation, but the versatility is not strong, and the stability and reliability of the self-made single-chip microcomputer are yet to be verified. B equipment adopts PLC programmable controller, which is relatively convenient to repair.
(3) Quality: Company A is a high-tech enterprise. It is a large-scale enterprise specializing in the production of non-negative pressure water supply equipment. It has a sound quality assurance system, an independent quality management center is fully responsible, and the company has invested heavily. The advanced testing and experimental equipment advantageously guarantees the quality of scientific research and development, design, production and service. Its non-negative pressure products have been put into the market. At present, there are tens of thousands of non-negative pressure equipments operating reliably throughout the country, and they have quickly gained recognition from relevant departments at higher levels and won several awards. There are few engineering examples related to Company B, and the technical, quality, performance, and market aspects of its products are relatively inferior to those of Company A.
(4) Equipment installation and service: The patented products of Company A are all installed and commissioned by the professional team of the company, and are constructed according to the national construction specifications, which is a turnkey project. Both manufacturers promised to provide free maintenance of the equipment once a month during the warranty period, free maintenance once every six months, no worries, and a good service concept.
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