Related knowledge of axial-flow pumps
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In the axial flow pump, the water flow as the movement in the spiral on the surface, that is, on the one hand along the axis of advance, on the other hand followed by the impeller rotation.
Out from the impeller mid-stream flow with a tangential velocity of rotation, if they are directly into the pipe, the kinetic energy of this part of the rotation speak completely lost. To this end, the need to eliminate the rotational motion of the liquid, and transforms its kinetic energy into pressure energy to increase pump efficiency, and therefore has a guide vane.
Number of guide vanes in general the number of impeller blades more than a one or less. The number of impeller blades than the number of revolutions, the number of axial flow pump (ns = 500 ~~ 600) low specific speed, blade number Z = 5 ~~ 6; than the turn number of axial flow pump (ns = 800 ~ 900), leaf number Z = ; high rpm axial flow pump (ns and> 1000) Z desirable three or two. Adjustable axial flow impeller (blades can rotate), Z> 4 will cause difficulties in the rotating body. The distance between the guide vane inlet edge of the impeller outlet side have certain requirements for the 0.1D, D for the guide vane diameter; If this distance is too small, axial run unstable, if the distance is too large, the increase hydraulic losses.
The axial flow pump theoretical head, very similar to the equation and the centrifugal pump, but taking into account the axial flow pump exports entrance circumferential velocity, so there are:
H ∞ = u2 (v2u-v1u) / g
If the impeller entrance does not pre-rotation, the above equation: H ∞ = u2v2u / g
The theoretical flow rate: QT = vF
Where v - the liquid in the impeller axial points speed, m / sec;
F - the liquid in the exit cross sectional area, m ?.
Axial flow pump work, also the occurrence of cavitation. That leaves the back pressure is reduced to below the saturation pressure of the working water temperature, the liquid begins to evaporate to produce bubble; bubble into the area of ??high pressure along the flow line, the pressure on shrinking rapidly, resulting in a hydraulic shock, and the blade surface cause severe erosion damage. When the bubble region to further expand the blade back will be completely bubble cover, when the bubble elimination is not leaves, but leaves behind, so leaves no erosion, but leaves the bubble clogging The passage between the pump flow, pressure, efficiency, etc. drop, and noise and vibration, damage the water pump working properly.
Axial flow pump can be installed set up, horizontal or tilt.
Axial flow and centrifugal pumps compared with simple structure and compact size, light weight, high efficiency, can transport the dirty liquid, etc.. The high flow pump, leaves can also be designed to be adjustable type, changing the installation angle of the blade in the external load changes, thus changing the performance of the pump, so that the pump has a better economy. Small axial flow pump head, flow in the power plant is mainly used as a circulating pump, while becoming more widely used. Axial-flow pump installation and maintenance of horizontal centrifugal pump complex.
The axial flow pump characteristic curve characteristics are as follows:
An axial flow pump Q-H curve in the blade installation angle of the same steepness, online there is a turning point (K point). This characteristic curve, for condenser tubes run by the plot of dirt resistance increased, it will still meet roughly the same traffic. Steep spent axial flow of power or with the reduction of water a sharp increase.
2, the axial flow of work is the most favorable range of small, because of the efficiency curve, once they left the best efficiency point, whether left or right, the efficiency of the rapid decline.
3, axial flow of power is increasing with the reduction of throughput, which is entirely different with the centrifugal pump. Pump even in power when the power when idle than the normal conditions of power to two times, so you must use a larger capacity motor, and the startup is also easy to overload. Axial flow pump should start in the water valve is open and does not allow running using off small outlet valve to adjust the supply quantity.
234407BM 234706BM 234406BM 517/2860V/YA 5610/2500 517/1720X1V 527/1181M 510/1180M 517/930 510/670 590/560 510/500 52780 59080 517/368M 51760U 517/238 6207-2ZN 6206-2ZN 6205-2ZN 6204-2ZN 6203-RZ 6203-2ZN 6202N 6202-2ZN 6201-2ZN 6200ZZ 6200-2ZN 62/32-ZN 62/32-Z 62/32N 62/32-2Z 62/32-2RZ 62/32-2RS 62/28-2RZ 62/22-2RZ 61996 61992 61988 61984
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Axial flow pump for a high number of revolutions (500 ~ 1200) vane pump, the flow head low flow of about 0.1 to 50 m ? / sec, the head is generally less than 25 meters; majority in the 15 m . The flow in the the rotating bladed role, produce the axial movement along the axle. Because its leaves like a propeller, so called propeller pumps.In the axial flow pump, the water flow as the movement in the spiral on the surface, that is, on the one hand along the axis of advance, on the other hand followed by the impeller rotation.
Out from the impeller mid-stream flow with a tangential velocity of rotation, if they are directly into the pipe, the kinetic energy of this part of the rotation speak completely lost. To this end, the need to eliminate the rotational motion of the liquid, and transforms its kinetic energy into pressure energy to increase pump efficiency, and therefore has a guide vane.
Number of guide vanes in general the number of impeller blades more than a one or less. The number of impeller blades than the number of revolutions, the number of axial flow pump (ns = 500 ~~ 600) low specific speed, blade number Z = 5 ~~ 6; than the turn number of axial flow pump (ns = 800 ~ 900), leaf number Z = ; high rpm axial flow pump (ns and> 1000) Z desirable three or two. Adjustable axial flow impeller (blades can rotate), Z> 4 will cause difficulties in the rotating body. The distance between the guide vane inlet edge of the impeller outlet side have certain requirements for the 0.1D, D for the guide vane diameter; If this distance is too small, axial run unstable, if the distance is too large, the increase hydraulic losses.
The axial flow pump theoretical head, very similar to the equation and the centrifugal pump, but taking into account the axial flow pump exports entrance circumferential velocity, so there are:
H ∞ = u2 (v2u-v1u) / g
If the impeller entrance does not pre-rotation, the above equation: H ∞ = u2v2u / g
The theoretical flow rate: QT = vF
Where v - the liquid in the impeller axial points speed, m / sec;
F - the liquid in the exit cross sectional area, m ?.
Axial flow pump work, also the occurrence of cavitation. That leaves the back pressure is reduced to below the saturation pressure of the working water temperature, the liquid begins to evaporate to produce bubble; bubble into the area of ??high pressure along the flow line, the pressure on shrinking rapidly, resulting in a hydraulic shock, and the blade surface cause severe erosion damage. When the bubble region to further expand the blade back will be completely bubble cover, when the bubble elimination is not leaves, but leaves behind, so leaves no erosion, but leaves the bubble clogging The passage between the pump flow, pressure, efficiency, etc. drop, and noise and vibration, damage the water pump working properly.
Axial flow pump can be installed set up, horizontal or tilt.
Axial flow and centrifugal pumps compared with simple structure and compact size, light weight, high efficiency, can transport the dirty liquid, etc.. The high flow pump, leaves can also be designed to be adjustable type, changing the installation angle of the blade in the external load changes, thus changing the performance of the pump, so that the pump has a better economy. Small axial flow pump head, flow in the power plant is mainly used as a circulating pump, while becoming more widely used. Axial-flow pump installation and maintenance of horizontal centrifugal pump complex.
The axial flow pump characteristic curve characteristics are as follows:
An axial flow pump Q-H curve in the blade installation angle of the same steepness, online there is a turning point (K point). This characteristic curve, for condenser tubes run by the plot of dirt resistance increased, it will still meet roughly the same traffic. Steep spent axial flow of power or with the reduction of water a sharp increase.
2, the axial flow of work is the most favorable range of small, because of the efficiency curve, once they left the best efficiency point, whether left or right, the efficiency of the rapid decline.
3, axial flow of power is increasing with the reduction of throughput, which is entirely different with the centrifugal pump. Pump even in power when the power when idle than the normal conditions of power to two times, so you must use a larger capacity motor, and the startup is also easy to overload. Axial flow pump should start in the water valve is open and does not allow running using off small outlet valve to adjust the supply quantity.
