With the rapid development of science and technology brought by the progress of human society, the emergence of new technology products has been widely used in the field of water supply and drainage (such as inverters, programmable controllers, touch screens (human-computer interfaces), fuzzy controllers, etc.) Water supply equipment in a revolutionary technological leap in. At the same time, the application of new products also make the structure of water supply and drainage equipment and control a variety of ways.When the frequency conversion water supply equipment excellent "constant pressure variable" function is accepted, the " Constant pressure "in the life of the water supply equipment manifests the more obvious.Therefore, frequency conversion water supply equipment in the structure more use of" water pump group + frequency control cabinet "form.Then, frequency conversion water supply equipment need to pressure tank as part of the equipment? For example, different from the regular quantitative supply of production water, the domestic water consumption curve has a larger curve and has obvious time characteristics. Therefore, the domestic water supply equipment should have the energy-saving effect of "using more water, more power, less water and less power consumption" Characteristics. In general, frequency conversion water supply equipment in the normal water stage, the pump generally work in the high-speed section (also high area) For the pump power consumption is basically no controversy; low water and night water consumption is very small (or unmanned water, but the pipe there is always a certain leak), the pump into the low-speed operation, conditions deviate from the high efficiency area, energy-saving effect is not good; Pipe network to be completely sealed without leakage, not equipped with pressure tank frequency conversion water supply equipment to rely on low-speed operation of the pump to ensure that the pipe network constant pressure, that is, even if the user does not use water, pipe network without water flow, in order to ensure the pressure pipe network, pumps Must also maintain a certain low speed operation, when the pump consumes all the energy wasted - and this is similar to our weightlifter held up his posture after three seconds when the barbell state, although at this time did not do work, However, the athletes still need to contribute.In order to reduce the water supply equipment, small flow or zero flow pump energy consumption, frequency of living water supply equipment must be equipped with pressure regulator tank, in the small flow or zero flow water supply, pressure regulator by the pressure tank. Pressure tank in the conversion equipment in the end what role? First, the pressure tank is the pump can go to sleep prerequisite Tank - Utilizing Robert Boyle Gas Law: PV / T = n; (P-Pressure, V-Barrel Gas Volume, T-Temperature); Gas Pressure (P) vs. Volume ) Product is equal to the principle of constant, the use of water is very small nature of the compressibility, the external force will be stored in the tank, the gas pressure by the compression, when the external force disappears compressed gas expansion can exclude water.As we all know, life pipe end Therefore, the water supply equipment or system without pressure tank can maintain the system pressure by the pressure water of the pipe network itself, because the compression ratio of water is much smaller than that of gas, and when the pipe network has a small flow rate of leakage can cause pressure A substantial decline in the pump can start frequently.If the frequency pump directly to the user water supply, it is necessary to equipped with pressure tank, ease the pump frequently start.Because of the application of frequency conversion, equipment control pump due to the need (variable constant pressure) Flow frequency control pump to ensure low-speed pipe network "constant pressure", the use of this point, no longer set pressure tank frequency conversion water supply equipment must have a pump 24 hours of non-stop work or frequent start Pressure to ensure the pipe network, therefore, is to ensure that the pump pressure tank normal rest and extend the premise of sleep time. Second, the size of the pressure tank determines the pump sleep time (a) the pressure tank volume determines the volume of water to make up the pipe network within a certain pressure range; in the pipeline leakage flow (L / S) certain circumstances, the volume of the pressure tank The size of the decision to restart the pump the length of time between the time of interest, the larger the volume, the longer the interest; therefore, choose a slightly larger pressure tank can extend the pump sleep time. (b) Correct understanding of the size of the pressure tank volume. Large volume of pressure tank, will increase capital investment, maintenance inconvenience, inflatable long time. Example: In the life pipe network, the frequency conversion constant pressure value is P1 = 0.5MPa and the pressure lower limit (pump restart pressure) P2 = 0.35MPa. Under normal circumstances, it is assumed that the pipeline leaks 5L / h and the pump stops working at night by 7h : 00-5: 00) calculation, the leak is 35L, then if the pressure tank P1 P1 P2 = 0.15MPa pressure range of the regulation of water is greater than 35L, to ensure that the pump sleep for 7 hours. Therefore, the choice of regulating the amount of water in the 35 ~ 50L pressure tank is more appropriate. If we choose to adjust the water greatly exceeded the pressure of 50L (above the pressure range) pressure tank, although the pump to work longer hours of interest, but more than 7 hours has begun to enter the water phase, to extend the sleep time has no meaning. In contrast, supporting the small pressure tank and the over-volume pressure tank has the same pump to make the same time, so the pressure tank volume configuration is not necessary. It should be noted that the "Design Guideline for Building Water Supply and Drainage" GBJ15-88 does not provide for the frequency of start-up frequency of water pump pumps for living frequency control, therefore, the volume of the pressure tank is not in accordance with 7 hours, 5 hours , Or 4 hours to adjust the amount of water to choose; should be tailored to local conditions, based on system flow, pump power, construction area and other aspects of reasonable layout. In summary, for the living frequency conversion water supply equipment, how to properly configure the pressure tank with very little water is an important factor to prolong the sleeping time of the pump, reduce the pump loss and prolong the service life of the pump.
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