| After-sales Service: | 1 Years |
|---|---|
| Warranty: | 1 Years |
| Max.Head: | 30-50m |
| Max.Capacity: | 50-100 L/min |
| Driving Type: | Motor |
| Impeller Number: | Single-Stage Pump |
| Customization: |
|---|
Suppliers with verified business licenses
Audited Supplier | English Name 1 | Axial Flow Pump |
| English Name 2 | Pump |
| Using | Mining |
| Material | high chromium alloy |
| Advantage | Acid and alkali resistance, wear-resistant |
The vertical axial flow pump is a vane pump, which has the characteristics of large flow, low head, high specific speed, high efficiency, small footprint, variable performance parameters, and suitable for low water level conditions. Axial flow pumps (especially large pumps) have very strict requirements on the type and size of the inlet flow channel, which directly affects the performance of the pump (such as pump efficiency, cavitation performance, etc.), so it must pass a formal design (design institute design).
1. Basic structure and function of vertical axial flow pump
The water flowing from the suction pool passes through the suction horn tube, and because the blades of the impeller in the impeller room force the water to rotate, the water enters the guide vane body, performs energy conversion to generate lift, and flows through the pump cylinder to be discharged from the drainage elbow. The pump is connected to the intermediate shaft by a coupling (rigid). Bearings under the motor mounts carry the full downward axial force of the rotor. The intermediate shaft and the motor shaft are connected with an elastic coupling.
The impeller (hub body) of the axial flow pump has blades, and the performance parameters of the pump are changed according to whether the blades are adjustable. There are three types of axial flow pumps:
Fixed axial flow pump - the impeller (hub body) and the blades are integral structures, and the blades are not adjustable;
Semi-adjustable vane axial flow pump - the impeller (hub body) and the vane are combined structures, only when the vane is stopped, the vane can be removed to adjust the placement angle of the vane (such as 0°, ±2°, ±4°, ±6°, ± 8°), the adjustment of its angle is stepped;
Fully Adjustable Vane Axial Flow Pump - Through a set of adjustment mechanism (mechanical or hydraulic), the pump can be used for stepless adjustment of the vane placement angle by manual, electric, computer control, etc. during operation.
The vertical axial flow pump is based on the lift theory of the wing in aerodynamics. When the fluid bypasses the airfoil, it separates into two streams at the head end of the airfoil, which pass through the upper and lower surfaces of the airfoil respectively, and then converge at the tail end of the airfoil at the same time. The distance is longer than that of the upper surface, and the flow velocity of the fluid along the lower surface of the airfoil is larger than that along the upper surface of the airfoil. Correspondingly, the pressure on the lower surface of the airfoil will be smaller than that of the upper surface, and the fluid has a downward effect on the airfoil. Force, likewise, the airfoil will also produce a reaction force to the fluid, which is equal to and opposite to this force, and acts on the fluid. Under the action of this force, the water will be raised to a certain height.
Second, the performance characteristics of vertical axial flow pump
Compared with centrifugal pumps, vertical axial flow pumps have the following advantages:
1) The head increases sharply with the decrease of the flow rate, and the Q-H curve increases excessively. The main reason is that when the flow rate is small, backflow occurs at the inlet and outlet of the impeller blades, and the water flow repeatedly obtains energy, which is similar to the multi-stage pressurization state. , so the lift increases sharply, resulting in an increase in shaft power.
2) The Q-N curve is a steep drop curve, therefore, when the axial flow pump is started, the motor should be started with the gate valve fully opened.
3) The Q-η curve is hump-shaped. That is to say, the range of high-efficiency work is very small, and the efficiency drops quickly when the flow rate deviates from the design operating point. According to this feature of the axial flow pump, it is unfavorable to use the gate valve to adjust the flow rate, and generally only the method of changing the angle of the vane device can be used to change its performance curve.
4) In the pump samples, the NPSH of the axial flow pump is generally required to be large, so the maximum allowable suction vacuum height is small, and the water inlet conditions of the axial flow pump and the actual working conditions during operation need to be considered. The degree of deviation of the point from the design operating point of the pump, etc.
Suppliers with verified business licenses
Audited Supplier 
){kind=link}
){kind=link}