A water pump is a machine that transports or pressurizes liquid. It transfers the mechanical energy or other external energy of the prime mover to the liquid so as to increase the energy of the liquid, which is mainly used for conveying liquid, including water, oil, acid-base fluid, emulsion, suspending emulsion and liquid metal, etc., and can also transport liquid, gas mixture and liquid containing suspended solids. The technical parameters to measure the performance of water pump include flow, suction head, lift, shaft power, water power, efficiency, etc.; according to different working principles, it can be divided into volume pump, vane pump and other types. The volume pump is the transmission of energy by the change of its chamber volume. The vane pump uses the interaction between the rotary vane and the water to transmit energy, including centrifugal pumps, axial flow pumps and mixed flow pumps.
water ring vacuum pumps classification
1、 According to the working principle of the pump:
1. Centrifugal pump 2, vortex vacuum pump 3 mixed flow pump, 4, axial flow pump, 5, electric pump 6, steam pump 7, gear pump 8, screw vacuum pump 9, roots vacuum pump, 10, slide vacuum pump 11, jet pump 12, lift pump 13, electromagnetic pump 14, submersible pump, etc
2、 According to use:
1. Clean water pump, 2, slurry pump 3, sewage pump 4, chemical pump 5, oil pump, etc
3、 Other division methods:
There are many other ways to divide the water pump: according to whether the impeller is connected in series, it can be divided into single-stage and multi-stage pumps; according to whether the suction port of the water pump is one or two, it can be divided into single suction pump and double suction pump, etc.
water ring vacuum pump selection
1、 Recognize the manufacturer and consult the old users
When users choose pumps, it is better to go to the sales point approved by the agricultural machinery department, and they must recognize the manufacturer. It is suggested that priority should be given to the purchase of water filled submersible pump, and the brand and product quality certificate should be seen clearly. Never buy “three no” (i.e. no manufacturer, no production date, no production license) products, otherwise, if there is a problem, users will be helpless.
As a user, due to the limitations of professional knowledge, it is difficult to make a decision. The best way is to consult the experts in water pump. You can also consult some old water pump users, especially those who are close to their own use conditions. It is a wise choice to buy products that are trustworthy, reliable and more mature for these users. At the same time, the use of single-phase pump or three-phase pump shall be determined according to the local power supply.
2、 Select a pump that meets the head requirements
The so-called lift refers to the required lift, rather than the lift height, which is particularly important for the selection of pumps. The pump lift is about 1.15-1.20 times of the lifting height. For example, the vertical height from a water source to the place where the water is used is 20 meters, and the required lift is about 23-24 meters.
When selecting the pump, the head on the nameplate of the pump should be close to the required head, and the general deviation should not be more than 20%. In this case, the efficiency of the pump is the highest, it is also more energy-saving, and the use will be more economical. If the head on the nameplate is far less than the required head, the water pump is often unable to meet the user’s needs. Even if the water can be pumped, the water volume is pitifully small. But in turn, when the high head pump is used for the low head, the flow will be too large, resulting in motor overload. If the motor operates for a long time, the temperature of the motor will rise, and the winding insulation will gradually age, or even burn down the motor.
3、 Select the pump with proper flow
The flow of water pump, that is, the water output, should not be too large, or the cost of purchasing water pump will be increased. It should be selected according to the needs. For example, the flow of the self-priming pump used by the user’s family should be smaller as far as possible; for example, the submersible pump used by the user for irrigation, the one with larger flow can be selected appropriately.
4、 The key of choosing agricultural water pump
1. Choose water pump according to local conditions. There are three types of commonly used agricultural pumps, namely centrifugal pump, axial flow pump and mixed flow pump. The head of centrifugal pump is high, but the water output is not large, which is suitable for mountainous area and well irrigation area; the water output of axial flow pump is large, but the head is not too high, which is suitable for use in plain area; the water output and head of mixed flow pump are between centrifugal pump and axial flow pump, which is suitable for use in plain and hilly area. Users should choose according to the local conditions, water sources and lifting height.
2、 It is necessary to select the water pump in case of exceeding the standard. After determining the type of water pump, its economic performance should be considered, especially the selection of head and flow of water pump and its supporting power. It must be noted that the head (total head) indicated on the water pump label is different from the outlet head (actual head) in use, which is due to certain resistance loss when water flows through the water pipe and near the pipeline. Therefore, the actual head is generally 10% – 20% lower than the total head, and the water output is correspondingly reduced.
Therefore, in actual use, it can only be estimated according to 80% – 90% of the head and flow indicated on the nameplate. The selection of the matching power of the water pump can be based on the power indicated on the nameplate. In order to make the water pump start quickly and use safely, the power of the power machine can be slightly greater than the power required by the water pump, which is generally about 10% higher. If there is power, when selecting the water pump, the power of the power machine can be pressed Purchase the matching water pump.