No secondary negative pressure water supply equipment selection and pump selection

Free of negative pressure secondary water supply equipment is solve the water pollution and the shortage of high hydraulic pressure faults, pressurized water supply is improving as the current model, with no negative pressure ( The overlying) Of secondary water supply technology, making more intelligent secondary water supply equipment, energy saving, reliable, water supply mode no longer need to be susceptible to secondary pollution of the water tank water, but water pump into pressurization equipment, to secondary pressure of municipal pipeline network of water supply, implementation of high-level users daily water supply, a very good solution to solve the building water supply problem.

no secondary negative pressure water supply equipment selection:

at present the mainstream market mainstream water supply equipment is divided into three categories: high water pool ( Liquid level control) , pneumatic water supply ( Electric contact control) And frequency conversion water supply ( Divided into ordinary frequency conversion and no negative pressure frequency conversion) 。 High water pool is one of the most primitive way of top-down water supply, its structure is most simple, the cost of the lowest in the three kinds of water supply equipment. But as a result of a top-down by gravity pressure, hydraulic pressure is small, not suitable for more resident district. Were it not for economic reasons, do not recommend using this type of water supply; Type pneumatic water supply way belongs to eliminate product, in addition to the fire water supply equipment, other industries will no longer use this type of water supply; Frequency conversion water supply can be divided into ordinary frequency conversion water supply and no negative pressure frequency conversion water supply two kinds, ordinary frequency conversion water supply is a need to tank or water tank of the frequency conversion velocity modulation constant pressure water supply equipment, the type of equipment is suitable for tap water is not stable or no tap water supply situation; No negative pressure frequency conversion water supply equipment is a new type of clean sanitation, high efficiency and energy saving of frequency control water supply way, also is referred to as the network overlying water supply industry. It without having to build pool, directly connected to the municipal water pipe and make full use of original water pressure, water demand of same situation, without negative pressure frequency conversion water supply can choose smaller pumps and control equipment, power saving a large amount of electric energy and equipment investment, its energy saving effect can reach more than 50%. Recommended municipal tap water supply stable and economic bear ability of using this type of water supply.

no negative pressure secondary pump water supply equipment selection:

1, the water pump equipment selection guide ( Due to the water pump is pumping water life, if you are to choose life water supply equipment, can watch these factors. Directly related the equipment type selection calculation)

1。 1 qualitative features: medium density, viscosity, corrosion resistance, such as health level requirement. The high proportion liquid with water volume should increase the motor power, viscosity larger liquid should choose or impurity pump, slurry pump, acid and alkali corrosive liquid should choose stainless steel material to some of the salt solution should choose copper or other alloy or polymer material pump, the health high polishing treatment should be selected for the grade of stainless steel material of the pump.

1。 2 medium containing solid particles diameter, amount, etc. Impurities in liquid impurity water pump should be selected or the sewage pump

1. 3 medium temperature, high temperature medium should be used with heat pump conveying cooling equipment.

1。 4 required flow rate. General industrial pump can be ignored in the process of pipeline system leakage, but affected by the change of flow must be considered. Agricultural use, if is adopted, open channel water pump must also consider leakage and evaporation. Community for pump flow to choose need to be calculated according to the number of households, see the equipment for maximum flow calculation per hour.

1。 5 pressure: absorb water pressure, water pressure, pressure drop of pipeline system ( Head losses) 。 Packing seal of pump should not be used for the water intake itself stressful situations.

1。 6 pipeline system data: diameter, length, kinds and number of pipeline accessories, vacuum pressure to the pool of geometric elevation, etc. Decorate in the design line, should pay attention to the following items:

a reasonable choose pipe diameter, pipe diameter is big, under the same flow rate, liquid flow velocity is small, small resistance loss, but the price is high, the pipe diameter is small, can lead to resistance losses increase sharply, increase the selected pump lift, installed with power increasing, the cost and operation cost are increased. So from the perspective of technical and economic comprehensive consideration.

b discharge pipe and the joints can withstand maximum pressure should be taken into account.

c piping layout should decorate straight pipe as far as possible, try to reduce the pipeline in the attachment and try to narrow the pipe length, must turn, elbow bend radius should be 3 ~ 5 times the diameter of the pipe, Angle is greater than 90 ℃ as much as possible.

d pump discharge side of the valve must be installed ( Ball valve or valve, etc. ) And check valve. Used to adjust the point of water pump, valve check valve when the fluid flow reversal can prevent the pump inversion, and makes the pump to avoid water hammer blow. ( When the liquid flow back, will produce a great reverse pressure, make the pump damage)

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