Vortex pump working principle

Vortex pump (also called vortex pump) is a vane pump. Mainly by the impeller, pump body and pump cover. The impeller is a disk, and the leaves on the circumference are arranged radially. An annular flow passage is formed between the pump body and the impeller, and the suction inlet and the discharge outlet are both located at the outer circumference of the impeller. There is a partition between the suction port and the discharge port, thereby isolating the suction port from the discharge port. We divide the fluid in the pump into two parts: the fluid between the blades and the fluid inside the fluid path. When the impeller rotates, under the action of centrifugal force, the peripheral speed of the liquid in the impeller is greater than the peripheral speed of the liquid in the flow passage, so that a "circular flow" is formed. As the liquid from the suction inlet to the discharge outlet follows the impeller, the combined result of these two movements causes the liquid to produce the same "longitudinal vortex" as the impeller turns. So get the name of the vortex pump. It should be specially pointed out that the liquid particles in the pump body circumferential velocity less than the impeller circumferential velocity. In the longitudinal vortex process, the liquid mass enters the impeller blades several times and transfers the energy to the liquid particles in the flow channel through the impeller blades. Every time the liquid particle passes the leaf, it gains energy once. This is also the case of the same impeller diameter, the vortex pump vane pump head higher than other reasons. Not all liquid particles pass through the impeller. As the flow rate increases, the "annular flow" weakens. When the flow is zero, the "ring flow" the strongest, the highest lift. Since the liquid in the flow channel is impinged by the liquid to transfer energy. At the same time also cause a greater impact loss, so the efficiency of the vortex pump is relatively low.

Hex Bolt

Hexagon Bolt refers to the fastener composed of head and screw. According to the material, the bolt can be divided into iron bolt and stainless steel bolt, namely hexagon head bolt (partial thread) - C grade and hexagon head bolt (full thread) - C grade.

1. According to the stress mode of the connection, there are common and reamed holes. The bolts used for reaming holes should match the size of the holes and be used when subjected to transverse force

2. According to the head shape, there are hexagon head, round head, square head, countersunk head and so on. Generally, countersunk head is used in the place where the surface is smooth and no protrusion is required after connection, because countersunk head can be screwed into parts. Round head can also be screwed into parts. The tightening force of square head can be larger, but the size is large. Hexagon head is the most commonly used.

In addition, in order to meet the needs of locking after installation, there are holes in the head and in the rod, which can prevent the bolts from loosening when they are subject to vibration.

Some bolts have no thread of smooth rod to do thin, called thin waist bolt. This kind of bolt is conducive to variable force connection.

There are special high strength bolts on the steel structure. The head will be bigger. The size will also change.

In addition, there are special uses: T-shaped slot bolts, most of which are used in machine tool fixtures, with special shape, and both sides of the head need to be cut off. Anchor bolts are used to connect the machine and the ground, and there are many shapes, such as U-shaped bolts, and so on.

There are also special studs for welding, one with thread and the other without thread, which can be welded on the parts, and the other side can directly screw the nut.

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