How to choose a reasonable pump and its application requirements

Posted on

The correct selection of the pump not only needs to think about the characteristic curve of the pump, but also the characteristic curve of the pipeline system. In this way, the selected pump will not be too large. When selecting the pump in detail, the following points should be noted: Use a high-power pump as much as possible to reduce the number of operating pumps. . High-power pumps have high power and help save energy. In order to ensure that the parallel pumps operate in an efficient area all year round, the number of parallel pump units should not exceed 3 units. If it is necessary to make a pump operate independently and in parallel, the pump should pay attention so that each pump is connected in parallel to the left-hand gap of the high-efficiency section. In this way, when the single pump is running, the working point is shifted to the right, and it can still be in the high-efficiency section, so that the operating power within the entire working condition change scale is high. The power of the pipeline characteristic curve and the point of intersection of the Q-H curve of the parallel pump must not exceed the efficiency zone to ensure smooth filtration of the pump operation. When the pump combination is a variable speed pump and a constant speed pump, a speed control pump is usually set as a normally open pump, and a constant speed pump is a step speed control pump. The maximum size of the speeding pump should not exceed 75 to 100%. Avoid drastically reducing the operating power of the pump. The height of the speed-regulating pump unit should be considered at full speed.

For systems with large flow changes and small head changes, the pumps with steep flow-head curves are used. It is worth mentioning that a special fire pump (formerly known as a tangential pump) is recommended, and the flow-head curve is particularly steep and constant pressure. With regard to the high-level construction of the district water supply, it is advocated that the use of multi-export fire pumps will not only be economical but also prevent overpressure. The use of pressure relief valve, its position is located in the pump outlet check valve, under normal circumstances, the diameter of the pressure relief valve and the water pump outlet pipe diameter or smaller. Practice has proved that the pressure relief valve is active and reliable, and can effectively prevent damage caused by overpressure. The primary consideration for the placement of pump room equipment is whether there are two different water supply systems that share the same set of pumps under the premise of satisfactory flow and pressure. For example, if a high-rise building has both a water spray and a water curtain system, a fire hydrant, and an active water spray system, several sharing methods can be considered: (Typically speaking, a fire hydrant system should not share a fire pump with other fire protection systems because fire hydrant The system can be opened and saved together with other systems.) The two systems share, if the traffic is not satisfactory, the method of distinguishing fire zones can be used. If the pressure is not satisfactory, the method of setting the pressure reducing valve can be used.

With respect to the construction of super high-rise buildings that require partitioned water supply, it is advisable not to use general fire pumps. The use of multi-export fire pumps, high-level fire water supply system consisting of multi-stage and multi-outlet pumps is technically similar to the parallel connection of pumps, and therefore it also has the advantages of simple accounting, simplified system control, and low maintenance operations, and parallel comparison of pumps. Less, less land, low cost. Together, because several divisions can share a group of pumps, we will add a number of divisions to the same project, and then reduce the pressure values ​​in the vertical divisions. This provides a feasible solution to the problem of overpressure in the fire water supply system. Because the water supply and drainage of the underground pumping house needs to be constructed in harmony with the construction, layout, and electrical disciplines, the painter often describes the pump room first, but he thinks that it is better to place the indoor water supply main pipe first, and it is especially the pipe stem pipe placement. The water pump is arranged in an orderly manner.

The bed is made of I-beam, improves the overall bed capacity, the inside is made of stainless steel, greatly prolong the service life of the machine, using parts of domestic and international high-end, machining center bed in Longmen, to ensure the machining accuracy of the machine.

Model

CX9015

CX1325

Working area

900×1500×300

2500×1300×300

Transportation

X/Y axis is rack gear,Z axis is screw

Spindle power

5.5KW

Control system

DSP/NC studio

Command Language

G-code HPGL 3D

Driver

Step motor/Servo motor

Machine Power

6KW

Working Voltage

AC380v/±10%,50HZ

Machine size

2600×1700×1600

3600×2100×1800

weight

1.5T

2T

 

 

Normal Model Stone Machine

Normal Model Stone Machine,Cnc Stone Carving Machine,Stone Machine,Stone Broken Machine

JINAN HT MACHINERY CO.,LTD , https://www.jncncrouter.com