Shandong Hairui Zhonglian Pump Industry Co. , ltd. The centrifugal pump that is a major produces manufacturer. When type selecting of client centrifugal pump, manufacturer of my company water pump can provide the before-sales service such as price of centrifugal pump model, centrifugal pump, in order to offer client reference, and manufacturer of my water pump can provide the service of product of custom-built pump industry for the client. This product information is the knowledge that imports pipeline installation to be able to cause cavitation about undesirable centrifugal pump:
Usually, the exit line of action that the inlet tube line of centrifugal pump wants to compare pump normally wants big, what so centrifugal pump entrance installs is to shrink diameter. But the structure of meeting ground pump chooses to carry smooth design on the head or the bottom makes the same score a design. If do not use such installation structures, can cause cavitation appearance.
1. cavitation phenomenon
When centrifugal pump impeller place intensity of pressure is less than liquid saturation when vapour is pressed, the liquid begins aerification, generate a large number of bubble. Enter high-pressured area along with fluid inpour when blister, blister falls in high-pressured liquid action, condense quickly and burst. Right now, the fluid occupies some spaces formerly to pound to bleb with extremely high velocity of flow, form local hydraulic concussion.
What 2. cavitation can cause is serious and sequential:
(1) produces vibration and noise.
(2) is influential to the character of service of centrifugal pump: When cavitation develops certain level, blister arises in great quantities, can jam flow path, make all drop the discharge of pump, lift, efficiency apparently.
(The material that 3) convection can have character destroy: Basically be around blade entrance metallic exhaustion denudes.
3. risesCentrifugal pumpThe method that fights cavitation function has:
A. Improve machine pump composition, reduce Dhr, belong to machine pump to design an issue.
B. Raise the effective cavitation surplus inside device: Mainer more commonly used method is to use perfusion head inspiratory device.
In addition, reduce loss of inspiratory pipeline obstruction as far as possible, reduce steam pressure of liquid saturation evaporate, choose a little bit tubal way is old as far as possible when designing inspiratory pipeline namely, length is some shorter, bend and valve are less, carry liquid temperature as far as possible some lower wait for measure, can raise the surplus of significant cavitation erosion of device.
Suck about end model centrifugal pump (namely pump entrance is imported for the level) the installation problem of the prejudicial differ in roll end diameter on entrance conduit, in the data of standard of concerned pump tubing, its regulation is: The orientaton of diameter of canal of prejudicial different diameter on horizontal canal (horizontal part is still be down up) , by do not appear fluid bag or gasbag decision (divide kind of case) : 1, when medium from going up to enter pump downward, use a bottom to make the same score installation of prejudicial differ in roll end diameter, do not appear fluid bag; 2, when medium from falling to enter pump up, use installation of very smooth prejudicial differ in roll end diameter, do not appear gasbag; General situation rises even if be aspirant bottom is made the same score commonly, fall to be made the same score into the top.
So, in pump inlet tube the installation on the road changes appropriately diameter canal, conduce to alleviate the cavitation phenomenon of centrifugal pump.
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