Hydraulic Pumps (Full Lecture)
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- เผยแพร่เมื่อ 9 ก.ย. 2016
- In this lesson we'll examine fixed and variable displacement pumps commonly (gear, vane, and piston) used to drive hydraulic systems as well as discuss volumetric efficiency, pressure compensated pumps, and load sensing arrangements. Additionally, we’ll briefly discuss undesirable cavitation, aeration, and pseudo cavitation events. (Full Lecture)
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For more FREE online technical training check out the following playlists available at the bigbadtech channel:
DC Circuit Analysis • DC Circuit Analysis
Single Phase AC Circuit Analysis • Single Phase AC Circui...
3 Phase AC Circuit Analysis • 3 Phase AC Circuit Ana...
Hydraulics • Hydraulics and Electri...
Motor Control • Motor Control
Motors and Generators • Motors and Generators
Motor Drives/Variable Frequency Drives (VFD) • Motor Drives
Programmable Logic Controllers (PLCs) • Programmable Logic Con...
Back again, Jim. I just got a job as a controls electrician and I am reviewing this information. It's better than what they were able to teach us in the apprenticeship over zoom, hands down.
Thank you for your services. The best series to get started with hydraulics.
Dear jym. You have so much knowledge to share. And in a way so un-interested, that I am allways surprised and so gratefull to you !!!!!!!. Thank you for your dedication !!!!!!
Thank u so much for sharing ! The explanation is so clear to understand
Thank you for your hard work on this video. I hope many people find it in there search for knowledge on hydraulic principles.
There are many Techs that are put into a situation to work on equipment with hydraulic components without even a rudimentary understanding of the principles of pascals law or the dangers involved with high pressure fluid injection or crushing hazards. The weight of the machine on a cylinder WILL create pressure in a hose even if the prime mover is at rest. If you remove that hose you risk injection of fluid. The weight that pressure was holding will now fall also.
Holding valves are installed sometimes as a failsafe in case of primary system failure. You must provide adequate pressure to defeat the holding valve to actuate the cylinder etc. The lines beyond the holding valve WILL stay pressurized even with the prime mover at rest AND the weight supported AND pressure relieved at the valve. Most of these have "bleeder valves" to relieve the pressure without risk of injection.
I love studying on this channel
24:54
36:48
Loved the lecture 👍
Awesome !
Always The Best
شكرا
Thanks!
If the the load is 900psi, the pump generate the 900psi + 200psi pressure drop from the load sense setting which equals 1100psi right. So what happens to this pressure drop when the load is at 1950psi? Would the pump not have generate 2150psi to account for the 200psi pressure drop across the load sense?
អគុណthank
Like a radio new presentation
In which video will you discuss about properly matching engine power of ICE prime mover to the most suitable pump?
Unfortunately I don't directly cover this topic in any of the current lectures. Stay in touch though because this is something I should.
Not going anywhere and thank you sir
Very favourite
Hi , wanted a small clarification: I wanted to know how pressure changes in a hydraulic system pushing a load.
For e.g take a simple hydraulic Jack: My idea is that whatever force that I am applying on one side ( it may be 1 million N) , the pressure of fluid will always be based on the load rather than the 1 million N that I am applying. You get the picture : we have 2 cylinders connected to each other and filled with fluid. We have 2 pistons. I applying force on one of them to try to lift a load by the other piston. Suppose load = 500N
My oil pressure will be based on 500/A2
NOT 1million/A1.
So during the lifting process, the pressure will still be 500/A2.
Same thing will happen in a hydraulic circuit :flow of pump is constant , the oil pressure will be simply calculated using the load ; the cylinder will extend/retract at constant speed. BUT HOW CAN I ACCELERATE A PISTON? WE SHOULD HAVE AN 'ACCELERATING' FLOW ?
IF MY PISTON IS ACCELERATING , MY OIL PRESSURE WILL ALSO INCREASE! MY OIL PRESSURE WILL NO LONGER DEPEND ON THE LOAD! SIMPLY TAKE THE JACK EXAMPLE AGAIN ; HOW CAN I LIFT THE OBJECT and CAUSE ACCELERATION! WILL 1 MILLION N CAUSE ACCELERATION? WILL PRESSURE BE HIGHER?
Tq
I'm working on block making machine with a hydraulic pack of 37kw motor. Our challenge is to reautomate this machine and have new control on it.
In my production cycle i use sometimes 3 parts of the machine simultaneously, in some i need to use around 50bar, on another one 140 and so on..
What should be the best solution in making this system work properly?
Should we have a Vfd on the engine to control the rpm and there for control the pressure?
If i made any sense, is there anyone who can give me an advice?
For different pressures in the different legs use a pressure reducing valve: th-cam.com/video/5vtnOLyawPg/w-d-xo.html
Hey Jym, please can you explain me why according to POISEUILLE'S law increase pressure will increase the flow rate
Check out the flow control valves lecture at: th-cam.com/video/Tn3bsiQx1Ug/w-d-xo.html Long story short increased "pressure differential" increases flow rate. Given a constant load induced downstream pressure increasing the upstream pressure creates an increased differential and increased flow rate.
@@bigbadtech you are amazing Sir, learned a lot from your chanel. Thank you so much.
i have a question
are there any smaller lower power versions of hydraulic or pneumatic system, like the electrical ones, since there are big asynchronous electrical motors and there are also small DC motors that could be used in smaller projects outside from industry ?
Yes but fluid power systems don’t really scale down well.
@@bigbadtech so is it better to use electrical power to make a project like an exoskeleton over fluid power?
since it gotta be lite and mobile
Not an expert on these. Check out the Sarcos Guardian. I want to say it's hydraulics.
okay, thank you
if I have a hydraulic cylinder its operating pressure is 70 bar , my question if I have to choose pump its operating pressure the same operating pressure of cylinder?
If you wanted to get the full capacity out of your press a pump should meet or exceed this requirement and the pressure relief valve would limit system pressure to below 70bar.
so I have to use a hydraulic pump with more operating pressure than 70 bar and use pressure relief valve on the input of cylinder, right?but hydraulic pump should exceed 70 bar how much?
How fast do you want the press to move? You'd need to look at the pump flow rate performance chart at specific pressures.
press will move in 20.8 cm/s and the flow rate is 24.5 l/min
1. Pressure is force per area unit
2. Force makes a load or mass to move (Newton's laws of motion)
3. Force comes from the prime mover and the pump
4. Since force and pressure represent the energy from the pump
5. Pressure must come from the pump to
6. If the pressure is induced by the resistance to flow then the force that moves the load or mass must be induced by the resistance as well. Now we are stuck in an impossible theory...
#4 is incorrect thus #5 and your conclusion is flawed.
Pressure is resistance to flow. The pump is the device which provides the flow. The resistance is determined by the load and/or the relief valve. The load presents a resistance via gravity acting on that mass. The spring is compressed via screw thread, that preload occurred at assembly.
Your #6 is a non sequitur conclusion.
This lecture is little bit going top of my head. Can you just type me with short and brief explanation.
There's no shortcuts. Start watching the first lecture in this playlist and watch it till the end: th-cam.com/play/PLdnqjKaksr8ruhw85YYSSO6EWLhVVmSKm.html
@@bigbadtech I am watching all your videos from the starting of this lecture but at this video I am not yet clear with the theory of the hydraulic pumps.
20:34 ouch... I'm just curious okay?
1714 is a conversion of flow in gpm (volume per time) and pressure in psi (force per area) to power (force and distance over time).
@@bigbadtech Speed is governed by flow rate. Force is governed by pressure. Direction is governed by valve position. Do I get a cookie now?
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