In order to better discharge the gas in the suction pipeline and generate a certain vacuum value during the operation of general centrifugal pumps, exhaust pipe measures must be adopted. For small pumps, the pump casing and water inlet must be filled with water before starting. In order to better avoid water jumping, a single side water pump bottom valve is installed at the bottom of the water inlet that opens when water flows up and closes when it flows down; Generally, centrifugal pumps with large water seepage specifications above 300mm are not equipped with bottom valves, but only use professional vacuum equipment to vacuum drinking water. There is no doubt that starting the water supply pump will cause inconvenience and lead to hasty consumption.

Principle: Centrifugal pumps operate by using the rotation of the impeller to generate centrifugal motion of water. Before starting the water pump, it is necessary to fill the pump casing and suction pipe with water. Then, start the electric motor to push the impeller and water to perform high-speed running fitness exercise. The water produces centrifugal motion and is thrown towards the edge of the impeller. It is then injected into the pressurized water pipeline of the water pump through the gate of the volute pump casing.

Structure: A centrifugal pump operates by using the rotation of the impeller to generate centrifugal motion of water. The main structure of a centrifugal pump is composed of six parts: impeller, pump casing, pump shaft, rolling bearing, sealing ring, and sleeve joint.

The structural type of self priming centrifugal pumps has been improved, overcoming the shortcomings of general pipeline centrifugal pumps. The advantage of a self priming centrifugal pump is that the pump casing is a double vortex shell structure. The detergent outlet is located on the edge of the water pump impeller, and there is a large capacity vapor liquid separation chamber above the outlet. Other structures are similar to single pole single suction centrifugal pumps, including sealing rings, machine seals, shafts, and rolling bearings. When starting the self priming pump for the first time during operation, it is necessary to introduce a diversion channel into the pump casing, and the amount of introduction should exceed the centerline of the pump within the pump casing. Afterwards, the fully automatic suction pipe can be started anytime and anywhere, without the need to introduce water into the diversion channel, making the application more convenient than pipeline centrifugal pumps.

Principle: The design principle of a self priming water pump is to fill the pump casing with water (or the pump casing itself has water) before starting the pump. After startup, the high-speed operation of the impeller causes the water in the impeller channel to flow towards the vortex shell. At this time, a vacuum pump is generated in the channel, causing the water seepage check valve to open. The gas in the suction pipe enters the pump and reaches the edge through the impeller channel.
oil-type rotary vane vacuum pump of maintenance