Abstract: A new type of water supply scheme is proposed, which not only retains the advantages of frequency-controlled constant-pressure water supply scheme, such as continuously adjustable outlet flow, constant water outlet pressure and good water supply quality, Design capacity, improve the system-wide cost performance. Key words: pump combination optimization frequency conversion speed regulation CLC: TU991.6 Document code: C Article ID: 1000-4602 (2000) 02-0032-03 At present, the building water supply system has gradually abandoned the water tower, high water tank, Pressure tank and other traditional technologies, and the use of computer-controlled frequency converter with variable speed pump motor, constant pressure water supply. This technology has made great strides in terms of stabilizing water pressure, reducing equipment size, and saving energy. However, the cost-effective and technically complex frequency converter has reduced the performance-to-price ratio of water supply systems. To solve this problem, the most effective way is to reduce the selection of inverter capacity without reducing the performance of the water supply system. Market research shows that the greater the capacity of the inverter, the greater the impact on project costs. Therefore, when designing a large capacity water supply system, how to reduce the capacity of the VFD is the most effective technical way to improve the engineering cost performance. A binary variable flow pump combination of constant pressure water supply method [1] proposed an automatic regulator without frequency converter (or pressure tank) method, that is, a combination of binary variable flow pump water supply method, are described below : Figure 1 is a schematic diagram of the system using binary variable flow pump combination of regulated water supply method. The system has a total of four pumps M0, M1, M2, M3 parallel operation, the combination of water. The rated head of each pump is the same and the rated flow rate changes twice. If the nominal flow rate of M0 is q, then the rated flow of the other three pumps M1, M2 and M3 are 2q, 4q and 8q respectively. The number 1 indicates that the pump is working, and the number 0 means the pump is stopped. So M0, M1, M2, M3 four working state of each pump with a binary number a0, a1, a2, a3 to be expressed. The working state when they are combined together is represented by a four-digit binary number a3a2a1a0. As shown in Table 1, a total of 16 four-digit binary number changes, these changes not only represent the combination of the current water pump, but also represents the water pump combination can provide the outlet flow Qt (in the calculation of each working condition Outlet flow, the approximate neglect of the pump due to the parallel operation of the flow caused by loss). That is, the greater the number, the greater the exit traffic; the smaller this number, the smaller the exit traffic. Thus found according to the amount of user volume, adjust the system of water flow to ensure that the regulator water supply, its working principle is: electric contact pressure gauge set the upper limit pressure H2, the lower limit pressure H1, H1 and H2 constitute a pressure stability range . If the actual water pressure H is low, when H <H1, the programmable controller switches the working state of the water pump combination according to the increasing law of the binary number a3a2a1a0 in Table 1, increases the water flow of the system, and the water pressure rises until H≥H1, H pressure is high, H> H2, the programmable logic controller according to a3a2a1a0 regressive switching pump combination of working conditions, reducing system flow, water pressure down until H <H2. In such a normal operation, H1 <H <H2, the actual water pressure H of the water supply system is stabilized within the range specified by H2 and H1 to achieve the purpose of stabilizing the water pressure. Table 1 Suwon combination work status table Total flow M3 M2 M1 M0 Q a3 a2 a1 a0 no 0 0 0 0 q 0 0 0 1 2q 0 0 1 0 3q 0 0 1 1 4q 0 1 0 0 5q 0 1 0 1 6q 0 [Buy] fire pump [Buy] pressure test pump [Buy] vacuum pump [Procurement] vertical pump [Procurement] Pump ã€Purchase】 copper alloy castings ã€Purchase】 water pump ã€Purchase】 hydraulic parts ã€Purchase】 gear pump Previous: Eliminate common faults of small water pump irrigation machine Next: High temperature water source heat pump in Dagang Oilfield var cpro_id = "u2852961"; Special recommendation The advantages and main purposes of single-screw pump resistance Chi high-quality plunger pump business "beachhead battle" Shanghai Shenfu new plastic industry standard valve Market Analysis: The valve market turnover of up to 1,500 billion 2018 Xiamen International Vending machines and self-service products Exhibition Venue - Time-related articles Product Guide Technical Interpretation Media Focus Exhibition Information Valve Market Analysis: The valve market turnover of up to 150 billion yuan 2018 Xiamen International vending machines and since Service Products Exhibition Venue - Organizing Time · Valve Market Analysis: Valve Market Turnover Up to 150 Billion Yuan · 2018 Xiamen International Vending Machine and Self-service Products Exhibition Venue - Time of Organizing · 2018 Xiamen Smart Retail Terminal Conference Venue - Organizing Time - Registration Contact - Participation Fee · About Asia Fluid Network 2018 Spring Festival Holiday Notice · Olsen Pump Industry - Chinese National Industrial Pumps Brand: Large Diameter Diesel Self-priming Sewage Pump Technology Fills the Domestic Vacancies · Olsen Pumps Approved by Sinopec , Officially become the long axis of the petrochemical pump and other material procurement suppliers · 2018 Kunming Beauty Expo Registration Contact - Location - Time 2018 Kunming Beauty Expo venue - Time - Registration Contact - 2018 Wuhan US Fair registration fee Contact Us - Location 2018 Wuhan Beauty Expo where the time? · 2018 Wuhan US Fair registration contact information - Venue - time 2018 Wuhan US Fair where? · 2018 Wuhan US EXPO venue - Registration Contact - Time - Participation Fee · 2018 Wuhan US EXPO Registration Contact - Location - Time - Participation Fee · Analysis of water ring vacuum pump advantages and shortcomings of water ring pumps · Analysis of magnetic pump failure Analysis and solutions · 2018 Jinan US Fair venue - Time - Registration Contact - Participation Fee 2018 Zhengzhou US Fair Venue - Time - Registration Contact - Exhibition Costs Person Interviews Corporate News Industry Research Exhibition Style Chengdu speed up the construction Expo Ecology Circle Strive to Create a Hundred and Thousand Industry in 2020 Xinhua News Agency Issues Interview with Yao Rui, Curator of China Pavilion in Astana Expo · Chengdu Speeds up the Construction of Ecology Circle in the Exhibition and Strives to Forge A Thousands Billions Industry by 2020 · Xinhua News Agency Interview with Wang Ruixu, Curator of China Pavilion, Astana EXPO · Interview with Wang Dongxu: "Huizhan Exhibition" is dedicated to providing "Intelligent Information" services for the exhibition · Interview with Pan Jianjun: Miao Convention & Exhibition to create "upgraded version" · Northeast Light Alloy Company Casting Plant Yang Haifeng: Casting quality dreams of East Light new technology · Exclusive Interview with Fei Fei general manager Zhu Longwei: Pump also need to keep pace with the line · Young technicians bravely take the burden Think about the design of vibration mold was successful · Wheel motorists: transformation and upgrading need forward-thinking thinking Olsen Pump - China's industrial pump national brand: large-caliber diesel engine since Suction sewage pump technology to fill the gaps In the pump through the audit of Sinopec audits, officially became the long axis of the pump and other material procurement suppliers · Olsen pump - the national brand of industrial pumps in China: Large-diameter diesel self-priming sewage pump technology to fill Domestic gaps · Olsen pump industry audit by the Sinopec audit, the official became the long axis of the pump and other material procurement suppliers · 7 contained a strong rise of innovation Chiafei pump Qiaotuo diaphragm market · Independent research and development of chemical fiber pump industry in Shanxi by carbon fiber pump Break the monopoly of technology in Europe and the United States rooted in high-concentration brine electrodialysis process Liaoning Yi Chen Mead Tim green industrial water treatment · Secret Hualing superhard latest R & D products: casting grinding tools · blue collar environment: to seize the high technology of environmental protection equipment manufacturing · generous technology to enter Ammonia escape monitoring market peak return valve market analysis: the valve market turnover of up to 1 500 billion yuan What is distributed photovoltaic? 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