» Topics » Questions »What creates a load on a centrifugal pump?

What puts a strain on a centrifugal pump?

Where I don’t go to forums, they write everywhere, they say, the greater the suction depth or the pipe is already, the MORE the load on the centrifugal pump))) But is it so, let's figure it out!
What puts a strain on a centrifugal pump?

The blades of a centrifugal pump untwist water, as a result of which it moves from the center to the edges. In the center most often, there is an inlet pipe, and at the edge of the impeller there is an outlet.
The pump pumps water due to the speed of rotation of the water in the impeller, as I wrote above. That is, the incoming new water needs to be untwisted all over again and again, since it does not spin, it is a "standing mass", this causes a load on the motor!
That is, the slower the water enters the pump, the easier it is for him to work, since you need to spin a small mass! If the suction is completely closed, the impeller will work just like a solid rotor, it will not lose mass and, at the same time, kinetic energy.
And this is logical, the MORE water the pump pumps, the MORE it consumes current and the harder it is. Therefore, everything is actually the opposite of what the absolute majority thinks.
But if the motor is powerful, the example with suction shutoff is not correct (there will be cavitation), it is better to take the output shutoff as an example.

A submersible pump with a centrifugal impeller will work similarly. But! If there is a "propeller" or piston, then of course, with a decrease in performance, current consumption will increase and the load will increase.

Or I'm wrong?)
Question \ topic is automatically published in the social. site network - stay tuned for answers there:

Suitable for topic

Related topics

Add a comment

    • smilesmilesxaxaokdontknowyahoonea
      bossscratchfoolyesyes-yesaggressivesecret
      sorrydancedance2dance3pardonhelpdrinks
      stopfriendsgoodgoodgoodwhistleswoontongue
      smokeclappingcraydeclarederisivedon-t_mentiondownload
      heatirefullaugh1mdameetingmoskingnegative
      not_ipopcornpunishreadscarescaressearch
      tauntthank_youthisto_clueumnikacuteagree
      badbeeeblack_eyeblum3blushboastboredom
      censoredpleasantrysecret2threatenvictoryyusun_bespectacled
      shokrespektlolprevedwelcomekrutoyya_za
      ya_dobryihelperne_huliganne_othodifludbanclose
3 commentary
Author
well, that's right, there is no new water, no need to unwind a new mass. More sound should grow momentum
Conducted small field measurements ... on a small transfer pump.
Centrifugal impeller

with hoses

Pure xx (without water) 12v ~ 0.42A


Made a lift of water in a hose - 1.3m
The suction hose is lowered into the water from 0.1 ... 0.2 m
When you turn on the water does not suck ... Pouring water into the outlet pipe off. comp. and incl. starts to download.
Water run ~ 1.4A
I plug in the inlet ~ 1.22A
I plug the output pipe ~ 1.22A

Strange, but tse take. Maybe you need more diam. output hose ...
A bilge (drain) pump is placed on the boat. There is a similar principle to a centrifugal impeller pump. The gaps are big by the way ... not afraid of garbage. For us, the task was for the pump to be economical and efficient for a small boat of type Progress 4. The height of the water lift in real life is <1m. TMC-450GPH (Taiwan), YJCAL-500 (Ketai), Johnson Pumps Cartridge-500GPH (USA) and another 800l / h transfer pump (BLDCpump) were tested
The first 3 are collector engines and the current consumption can be used to judge the load.
When the inlet is blocked, productivity will decrease and the current will increase slightly (in the absence, of course, of an outlet pressure). Significant effect will be the overlapping of the outlet or the creation of backwater ...
And for example, the characteristics of the bilge pump pumps indicate the maximum performance when laying the outlet hose horizontally.
At a height of 25% of the maximum specified performance is reduced by 15%.
At a height of 50% of the maximum specified performance is reduced by 35%.
At a height of 75% of the maximum specified performance is reduced by 60%.
At a height of 100% of the maximum specified performance is reduced by 100%.

We advise you to read:

Hand it for the smartphone ...