Presentation on theme: "Prepared By Rohit G. Sorte M.Tech. A mechanical device using suction or pressure to raise or move liquids, compress gases, or force air into inflatable."— Presentation transcript:
A mechanical device using suction or pressure to raise or move liquids, compress gases, or force air into inflatable objects. Force (liquid, gas, etc.) to move in a specified direction by or as if by means of a pump
I. NONPOSITIVE DISPLACEMENT PUMPS II. POSITIVE DISPLACEMENT PUMPS
A pump produces a force on the liquid that is constant for each particular speed of the pump. Resistance in a discharge line produces a force in the opposite direction When these forces are equal, a liquid is in a state of equilibrium and does not flow. If the outlet of a nonpositive-displacement pump is completely closed, the discharge pressure will rise to the maximum for a pump operating at a maximum speed.
This pump, a definite volume of liquid is delivered for each cycle of pump operation, regardless of resistance, as long as the capacity of the power unit driving a pump is not exceeded. If an outlet is completely closed, either the unit driving a pump will stall or something will break Therefore, a positive-displacement-type pump requires a pressure regulator or pressure-relief valve in the system.
A centrifugal pump is built up of TWO MAIN PARTS : THE ROTOR (or Rotating Element). THE CASING (or Housing or Body).
Their two parts I. THE IMPELLER II. THE SHAFT THE IMPELLER:-The rotating part of a compressor or other machine designed to move a fluid by rotation. THE SHAFT:- A long, narrow part or section forming the handle of a tool or club or the body of a spear or arrow
This is the stationary part of the pump and includes the : Suction Nozzle. Discharge Nozzle. Seals. Bearings
The act or process of sucking The force or condition produced by a pressure difference, as the force holding a suction cap onto a surface The act or process of producing such a force or condition
Discharge pressure describes the pressure of a liquid as it leaves a pump. Higher discharge pressures equal greater force behind the release while lower pressure means less. A pump’s discharge pressure is influenced.
Pumps are devices that move fluid volume by mechanical or physical action. Pumps use a particular kind of seal in order to prevent leakage.
Bearing is used For reducing friction & driver torque. For not getting leak also.
Centrifugal pumps, are a sub-class of dynamic axisymmetric work-absorbing turbomachinery Centrifugal pumps are used to transport liquids/fluids by the conversion of the rotational kinetic energy to the hydro dynamics energy of the liquid flow. The rotational energy typically comes from an engine or electric motor or turbine. In the typical simple case, the fluid enters the pump impeller along or near to the rotating axis and is accelerated by the impeller, flowing radially outward into a diffuser or (volute) chamber (casing), from where it exits.
A gear pumps which is used as a meshing gears, to pump the fluid by displacement. The Gear pumps are also widely used in chemical installations to pump fluid with a certain Gear pumps are positive displacement (or fixed displacement ), meaning they pump a constant amount of fluid for each revolution.
A liquid ring/Nash pump is a rotating positive displacement pump. They are typically used as a vacuum pump but can also be used as a gas compressor. The function of a liquid ring pump is similar to a rotary vane pump the difference being that the vanes are an integral part of the rotor and churn a rotating ring of liquid to form the compression chamber seal. They are an inherently low friction design, with the rotor being the only moving part. Sliding friction is limited to the shaft seals. Liquid ring pumps are typically powered by an induction motor.
The submersible pumps are multistage centrifugal pumps operating in a vertical position. Roduced liquids, after being subjected to great centrifugal forces caused by the high rotational speed of the impeller, lose their kinetic energy in the diffuser where a conversion of kinetic to pressure energy takes place.
A pump that raises water by means of helical impellers in the pump casing. a hydraulic machine whose working member is a screw; used for pumping liquids, including high- viscosity fluids. Screw pumps, also referred to as worm pumps, are a type of rotary pump. The screw pump housing contains a driving screw and one or two driven screws. The points of engagement of the screws travel longitudinally along the shaft during rotation, thus forcing out the volume of liquid contained between the turns. It is potential energy that for the most part is transmitted to the liquids, as a result of which there is a considerable increase in pressure within it.
A centrifugal pump containing two or more impellers is called a multistage centrifugal pump. The impellers may be mounted on the same shaft or on different shafts. For higher pressures at the outlet impellers can be connected in series. For higher flow output impellers can be connected in parallel. All energy transferred to the fluid are derived from the mechanical energy driving the impeller.
A type of hydraulic pump that uses cam lobe action against pistons to generate hydraulic fluid A piston pump is a type of positive displacement pumps where the high-pressure seal reciprocates with the piston. Piston pumps can be used to move liquids or compress gases.
The mechanical device that is used to convert mechanical power into hydraulic energy is known as a hydraulic pump. The load that is responsible for the pressure is overcome with this device by creating sufficient power and generating a flow. The hydraulic pump has two functions to perform during operation, allowing atmospheric pressure to push liquid into the inlet line from the reservoir to the pump by the mechanical action created vacuum at the pump. The other function it performs is that the pumps mechanical action supplies the liquid to the pump outlet and then forced into the hydraulic system.
The following graphs address some of the problems that could occur when a pump is operating: a. Overloading :- One risk of overloading is the danger of excess torque on a drive shaft.(You may need a larger pump) b. Excess Speed :- Running a pump at too high a speed causes loss of lubrication, which can cause early failure. Excess speed also runs a risk of damage from cavitation. (use a higher displacement pump)