The relationship between the head, flow and impeller diameter of the high-pressure self-balancing corrosion-resistant multistage pump:
The cutting law of the high-pressure self-balancing and corrosion-resistant multi-stage centrifugal pump: (H1: H2)^2=D1: D2Q1: Q2=D1: D2 It can be seen that the diameter of the impeller is proportional to the square of the head and proportional to the flow rate. The larger the diameter of the impeller, the greater the lift and the larger the flow rate, because the water flow rate depends on the centrifugal force and the linear velocity on the tangent line when the impeller rotates. The larger the diameter, the greater the centrifugal force and linear velocity.
The relationship between the impeller and head of the high-pressure self-balancing corrosion-resistant multi-stage pump:
The head of the high-pressure self-balancing and corrosion-resistant multi-stage pump depends on the structure of the pump, such as the diameter of the impeller, the bending of the blades, and the speed of the pump. The vertical height from the center line of the pump impeller to the water surface of the outlet pool, that is, the height at which the pump can press the water up, is called the pressurized water lift, or pressure range for short.
That is, pump head = suction head + pressurized water head. It should be pointed out that the head marked on the nameplate refers to the head that the pump itself can generate, and it does not include the loss head caused by the frictional resistance of the pipeline water flow. When choosing a water pump, be careful not to ignore it. Otherwise, there will be no water.
The head of the high-pressure self-balancing corrosion-resistant multistage pump is related to the diameter of the impeller. The larger the impeller, the greater the head, and vice versa. The flow rate has nothing to do with the diameter of the impeller. Under rated conditions, the larger the head, the smaller the flow, which is inversely proportional.
Precautions for the measurement of the head of the high-pressure self-balancing corrosion-resistant multi-stage pump:
The head of the pump can be measured by experiment, that is, a vacuum gauge is installed at the inlet of the pump and a pressure gauge is installed at the outlet. If the kinetic energy difference between the two gauge sections (ie Δu2/2g=0) is not counted, the energy between the two gauge sections is not counted. Loss (ie ∑f1-2=0), the pump head can be calculated by the following formula.
Pay attention to the following two points:
1. In the formula, p2 is the reading of the pressure gauge at the outlet of the pump (Pa); p1 is the reading of the vacuum gauge at the inlet of the pump (negative gauge pressure, Pa);
2. Pay attention to distinguish the two different concepts of centrifugal pump head (pressure head) and lifting height.
The relationship between high pressure self-balancing and corrosion-resistant multi-stage pumping water volume and vacuum:
The high-pressure self-balancing corrosion-resistant multi-stage pump relies on centrifugal force to pump water, and it will burn out if it is idling without water. For vacuuming, use a vacuum pump or a method of first vacuuming and second vacuuming. The vacuum degree at the inlet of the high-pressure self-balancing corrosion-resistant multistage centrifugal pump is composed of three parts (it can be obtained by establishing the Berlier equation at the inlet of the pump and the suction liquid level)
1. Suction height, this has nothing to do with flow;
2. The loss of the suction device is proportional to the square of the flow;
3. Establish the kinetic energy head at the inlet of the pump, which is proportional to the square of the flow;
The second and third terms are directly proportional to the square of the flow, so the vacuum at the pump inlet increases with the increase of the flow.
