1. According to the layout of the device, terrain conditions, water level conditions, and operating conditions, determine the selection of horizontal, vertical and other types (pipeline, submersible, submersible, non-clogging, self-priming, gear, etc.) gear pumps.
2. According to the nature of the liquid medium, determine whether the clean water gear pump, hot water gear pump or oil gear pump, chemical gear pump or corrosion-resistant gear pump or impurity gear pump, or use a non-clogging gear pump.
The gear pump installed in the explosion area shall adopt the corresponding explosion-proof motor according to the level of the explosion area.
3. According to the size of the flow rate, determine whether the single-suction gear pump or the double-suction gear pump is selected; According to the head level, choose single-stage gear pump or multi-stage gear pump, high-speed gear pump or low-speed gear pump (air conditioning gear pump), multi-stage gear pump efficiency is lower than single-stage gear pump, such as single-stage gear pump and multi-stage gear pump can also be used, first choose single-stage gear pump.
4. Determine the specific model of the gear pump, determine what series of gear pump to choose, you can determine the specific model on the spectrum or series characteristic curve according to the maximum flow rate, (when there is no maximum flow, usually 1.1 times of the normal flow rate can be taken as the maximum flow), and take the head after amplifying the 5%-10% margin.
Using the characteristic curve of the gear pump, find the required flow value on the abscissa, find the required head value on the ordinate, from the two values respectively upward and to the right vertical line or horizontal line, the intersection of the two lines just falls on the characteristic curve, then the gear pump is the gear pump to be selected, but this ideal situation is generally rare, usually encounters the following two situations:
The first type: the intersection point is above the characteristic curve, which indicates that the flow meets the requirements, but the head is not enough, at this time, if the head is about the same, or the difference is about 5%, it can still be used, if the head is much different, then choose the gear pump with a larger head. or try to reduce the loss of resistance in the pipeline.
The second type: the intersection point is below the characteristic curve, within the fan-like trapezoidal range of the characteristic curve of the gear pump, this model is preliminarily determined, and then according to the difference in head, it is decided whether to cut the impeller diameter.
If the difference in head is very small, do not cut, if the difference in head is very large, according to the required Q, H, according to its cutting formula, cut the diameter of the impeller, if the intersection point does not fall in the fan-shaped trapezoidal range, should choose a gear pump with a smaller head. When selecting gear pumps, sometimes it is necessary to consider the requirements of the production process and select Q-H characteristic curves of different shapes.
5. After the gear pump model is determined, the water gear pump or the gear pump with the physical and chemical medium of the conveying medium similar to water needs to be corrected according to the performance table or performance curve of the relevant product catalog or sample to see whether the normal working point falls in the priority working area of the gear pump.
6. For the liquid gear pump with a viscosity greater than 20mm²/s (or a density greater than 1000kg/m3), the characteristic curve of the water experimental gear pump must be converted into the performance curve of the viscosity (or at the density), especially the suction performance and input power should be carefully calculated or compared.
7. Determine the number and standby rate of gear pumps: for the normal operation of the gear pump, generally only one is used, because a large gear pump is equivalent to two pinion pumps working in parallel, (referring to the same head and flow), and the efficiency of the gear pump is higher than that of the pinion pump, so from the perspective of energy saving, it is better to choose a large gear pump instead of two pinion pumps, but in the following situations, two gear pumps can be considered in parallel:
The flow rate is so high that one gear pump can't reach it.
For large gear pumps that require a 50% standby rate, two smaller gear pumps can be changed to work, and two are standby (a total of three).
For some large gear pumps, the gear pump with 70% flow requirement can be used for parallel operation, without the need for a spare gear pump, and when one gear pump is overhauled, the other gear pump still bears 70% of the production delivery.
For gear pumps that need to run continuously for 24 hours, three gear pumps should be spared, one for operation, one for standby, and one for maintenance.
8. Under normal circumstances, customers can submit their "basic conditions for selecting gear pumps", and the pump manufacturer will select or recommend better gear pump products. If the design institute has determined the model of the gear pump when designing the equipment, it shall be configured according to the requirements of the design institute.
When selecting gear pumps, it is necessary to comprehensively consider the working pressure, flow, speed, quantitative or variable, variable mode, volumetric efficiency, total efficiency, life and type of prime mover, noise, pressure pulsation rate, self-priming capacity, etc., as well as compatibility with hydraulic oil, size, weight, economy, maintenance, etc.: these factors, some have been written in the product sample or technical data, to study carefully, unclear places are best to consult the regular gear pump manufacturer related gear pump selection manual content.
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