How much do you know about single suction pumps?
Release time:
2023-01-04
Source:
In the selection process of a single suction pump, confirming the parameters and performance of the pump after determining the pump type is an issue that buyers need to verify and pay attention to. Since each company's single suction pump models are different, as well as their parameters and performance, it is still necessary to compare several options and choose a suitable middle-opening pump.
In the selection process of a single suction pump, confirming the parameters and performance of the pump after determining the pump type is an issue that buyers need to confirm and pay attention to. Since each company's single suction pump model is different, the parameters and performance are also different, so it is still necessary to compare several options and choose a suitable middle-opening pump.
The principle of a single suction pump is roughly the same. During operation, the inlet liquid simultaneously enters the center area of the impeller, and the high-speed rotating impeller throws the liquid out under the action of centrifugal force, thus forming a low-pressure area at the center of the impeller. Under atmospheric pressure, the inlet liquid continuously flows into the low-pressure area, which is the cycle process of entering the center of the impeller and being thrown out again.
The basic structure of a single suction pump consists of eight parts: impeller, pump body, pump cover, water stop ring, pump shaft, bearing, sealing ring, packing box, and axial force balancing device.
The impeller is installed inside the pump casing and fastened to the pump shaft. The pump shaft is connected to the motor through coupling technology, and the motor drives the pump shaft and impeller to rotate. There are liquid suction and suction pipes in the middle of the pump. The liquid enters the pump through a bottom valve and suction pipe. The discharge port on the pump casing connects with the discharge pipe. When the pump's speed is constant, its head and flow rate are related to the diameter of the impeller. Before starting the pump, it is necessary to fill the pump casing and suction pipe with water, then start the motor to drive the impeller and water to rotate at high speed; water will undergo centrifugal motion and be thrown to the outer edge of the impeller, flowing into the pressure pipe of the pump through the flow channel of the volute casing.
The principle of a single suction pump is similar to that of a regular centrifugal pump, but there is not much difference in principle. Single suction pumps can improve the flow rate of middle-opening pumps to meet conditions with larger flow requirements. Designers continuously research improvements; single suction pumps will be continuously improved in structure and other aspects to enhance their performance.
The short suction pipe of a single suction pump has a conical shape and is integrated with the pump cover. By removing the pump cover, one can clean inside the pump body and disassemble or assemble the impeller. Replace large ring seals. The impeller is installed at one end of the shaft and secured with a nut. The pump shaft is horizontally arranged and supported by a single row of radial bearings. Thin oil lubricates the bearings, and an oil gauge can detect oil levels in the bearing box. A packing box is set where the pump shaft passes through the pump body; it contains rotating soft packing and a water seal ring, which are compressed by a pressure cover. The internal passage cast in the pump body directs pressurized water to the water seal ring. The axial thrust of the impeller is balanced by balance holes. The internal flow channel of the pump body is volute-shaped and cast as one piece with an outlet flange. It can rotate relative to its support to change the direction of the pump outlet, allowing for upward or horizontal arrangements. The outlet flange on the pump body and inlet flange on the pump cover are equipped with screw holes for mounting pressure gauges and vacuum gauges respectively. A square bolt at the lower part of the pump body is used for draining water from inside to prevent freezing during winter shutdowns.
The impeller, pump cover, pump body, and bracket are all made of cast iron. The pump shaft is made from high-quality carbon steel.
Single suction pumps are small in size, lightweight, simple in structure, easy to transport and maintain. They are used for handling accumulated water at well bottoms or as supply pumps for compressed air stations as well as other auxiliary drainage facilities.
Single suction pump
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