What are the types of water pumps for diesel engines

Article provenance：Hai Rui ZhonglianPopularity：Publication time：2020-03-24 09:16

centrifugal pump

1. Working principle of centrifugal pump

Before the pump starts, the pump and the inlet pipe are full of water. After the pump runs, under the influence of the centrifugal force produced by the rapid rotation of the impeller, the water in the impeller passage is thrown around, pressed into the worm shell, and a vacuum is formed at the impeller inlet. The water in the pool is drawn in along the absorption pipe under the external atmospheric pressure to supplement the space. Then the water sucked in is thrown out by the impeller and enters the outlet pipe through the insect shell. It can be seen from this that if the impeller of centrifugal pump continues to rotate, it can continuously absorb and press water, and the water can continuously rise from the low place to the high place or far away. In short, because of the centrifugal force produced by the high-speed rotation of impeller, centrifugal pump is called centrifugal pump.

2. Features of centrifugal pump

(1) The water flowing along the centrifugal pump is drawn in the axial direction of the impeller, and flows out perpendicular to the axial direction, i.e. the inflow and outflow directions flow at 90 ° to each other.

(2) Since the centrifugal pump absorbs the water in the vacuum through the impeller inlet, the water must be poured into the pump and the suction pipe before starting, otherwise the air must be drawn out by the vacuum pump to form a vacuum. In addition, the pump casing and suction pipe must be strictly sealed without leakage. Otherwise, no vacuum can be formed and no water can be absorbed.

(3) The suction height of the centrifugal pump cannot exceed 10 meters because the impeller inlet cannot form absolute vacuum. In addition, through the loss of water flow through the suction line, the actual allowable installation height (from the pump shaft height at the suction surface) is far. Less than 10 meters. If the installed water is too high, it will not absorb water; in addition, because the atmospheric pressure in the mountain area is lower than that in the plain, if the same water pump is installed in the mountain area, especially in the mountain area, its installation height should be reduced, otherwise it cannot absorb water.

Axial flow pump

Working principle and characteristics of axial flow pump

1. Working principle of axial flow pump

The working principle of axial flow pump is different from that of centrifugal pump. It mainly uses the thrust produced by high-speed rotation of impeller to lift water. When the blades of the axial-flow pump rotate, the lifting force generated by the water pushes the water upward from the bottom.

The blades of axial pumps are generally immersed in the sump. Due to the high-speed rotation of the impeller, under the lift generated by the blade, the water continuously pushes upward, making the water flow out along the outlet pipe. The impeller rotates continuously, and the water is continuously pressed on the high place.

2. Characteristics of axial flow pump

(1) The flow direction of the water in the axial flow pump is drawn in along the axial direction of the impeller and flows out axially, so it is called axial flow pump.

(2) Low lift (1-13m), large flow, high efficiency, suitable for drainage and irrigation of plains, lakes and rivers.

(3) Before the start of construction, there is no need for irrigation, and the operation is simple.

Mixed flow pump

1. Working principle of mixed flow pump

Because the shape of the impeller of the mixed flow pump is between the impeller of the centrifugal pump and the impeller of the axial flow pump, the working principle of the mixed flow pump has both centrifugal force and lifting force. Through the combination of the two, water flows out of the impeller at a certain angle with the blade shaft. Lift the water through the volute chamber and piping.

2. General characteristics of mixed flow pump

(1) Compared with centrifugal pump, mixed flow pump has lower head and larger flow. Compared with axial flow pump, mixed flow pump has higher head and lower flow. It is suitable for drainage and irrigation in plain and lake areas.

(2) And Huangzhou with a certain angle of suction water, along the flow direction of the mixing pump outflow, it is also known as the inclined pump.

Commonly used agricultural pump

centrifugal pump

Centrifugal pump models, specifications and variations are the most common in agricultural pumps. According to the way of water flowing into the impeller and the number of impellers, whether the pump body can be automatically filled or not, as well as the size and power of the supporting power, the centrifugal pump has a single-stage single suction centrifugal pump, a single-stage double suction centrifugal pump, a multi-stage centrifugal pump and a self-priming centrifugal pump. Pump, electric pump and diesel engine water pump.

1. Single stage single suction centrifugal pump

The old pump types are ba and B single-stage single suction centrifugal pumps. In the 1980s, according to the international standards and the actual situation of irrigation and drainage machinery, our country developed new centrifugal pump products and produced IB, IQ single-stage centrifugal pump series products, which were listed as national professional standards and industry standards.

Single stage single suction centrifugal pump, water enters the impeller from the shaft to the single surface, and there is only one impeller, so it is called single stage single suction centrifugal pump. The utility model has the advantages of high lift, small flow, simple structure and convenient use compared with the mixing pump and the shaft pump.

IQ single-stage single suction centrifugal pump (also known as light and small centrifugal pump) is designed according to the national conditions, in line with user requirements, simple structure, light weight, low price, good performance and convenient support. There are 84 products. 3 derivative series, 413 specifications.

(1) The diameter of the pump is 50-200mm, the flow is 12.5-400m3/h, the lift is 8-125m, the supporting power is diesel engine direct coupling, belt drive, motor direct coupling, the power is 1.1-110kw, and the speed is 1450-2900 rpm.

(2) The structure type of light and small centrifugal pump is axial suction single-stage single suction suspension centrifugal pump. The pump body opens behind the door, the outlet is in the center, the back cover is pressurized, the bearing body is directly connected with the pump body, and the pump foot is under the pump body. Grease the bearings. There are three types of shaft seal: soft packing, mechanical seal and rubber oil seal. The impeller is closed, and the transmission mode is divided into coupling transmission and double ring transmission. Pump impeller rotation: from the pump inlet direction, the impeller rotates clockwise. When the pump and the diesel engine are directly driven, the impeller rotates counterclockwise. The pump outlet can be equipped with a manual pump, and the bottom valve can be removed to reduce the hydraulic loss and make the pump dry by itself.

2. Single stage double suction centrifugal pump

It is a single-stage double suction centrifugal pump from the blade

Previous：Preparation steps of diesel engine fire pump before operatio Next：Use of diesel engine water pump

Recommended products

Product Center

Long shaft fire pump

Long shaft fire pump Product Brief XBD / g-hrzl axial flow deep well fire pump (long shaft deep well f...