Posted on Mar 4, 2020
A domestic pump by definition is a facility that moves fluids-state substance by its mechanical action that is used for daily routine applications such as sucking the clean water from the base pool to the water tower at the highest floor in a house, or pumping sediment after heavy rain. Classically, pumps can be categorized into three major types based on the method those pumps exploited to move the target fluids. Therefore, the three types of methods are determined by the way they move the targeted fluids, and there are direct lift, displacement, and gravity methods. That is, regarding the pump models, there are direct lift pump, displacement pump, and gravity pump. Pumps are typically operated by either typically reciprocating or rotary mechanism, and consume energy to perform mechanical work moving the fluid. The way that pumps installation is also a key. Mechanical pumps can also be submerged in the fluid in which they are pumping or be placed external to the fluid. Pumps can be categorized by their method of displacement into positive displacement pumps, impulse pumps, velocity pumps, gravity pumps, steam pumps and valve-fewer pumps. We will have a further explanation below.
Therefore, the three types of methods are determined by the way they move the targeted fluids, and there are:
That is, regarding the pump models, there are direct lift pump, displacement pump, and gravity pump. Pumps are typically operated by either typically reciprocating or rotary mechanism, and consume energy to perform mechanical work moving the fluid.
The way that pump installation is also a key. Mechanical pumps can also be submerged in the fluid in which they are pumping or be placed external to the fluid. Pumps can be categorized by their method of displacement into positive displacement pumps, impulse pumps, velocity pumps, gravity pumps, steam pumps and valve-less pumps.
Speaking of the pump operation, pumps can be operated through many power sources, such as manpower’s’ manual operation, electricity, engines, or even wind power. Those energy sources can be a wide variety of equipment which comes in any sizes, from microscopic for use in medical applications to large pumps for waterworks, or, in the industrial sectors the application is even wider. For example, ordinary size industrial pump for machine tool cutting liquid transmission as well as coolant circulation.
Here we talk about the industrial pumps and you may compared the applications with the domestic counterparts. Industrial pumps serve in a wide range of applications such as pumping water from conventional wells, aquarium filtering duty, pond filtering tasks, in the car industry for water-cooling and fuel injection, in the energy industry for pumping oil and natural gas or for operating cooling towers. In the machine tool sectors, pumps are used to move cutting liquids, coolants, etc. in the medical industry, pumps are used for biochemical processes in developing and manufacturing medicine, and as artificial replacements for body parts.
There must be impeller inside the pumps, be it domestic pump, or industrial pump, or Commercial Pumps. The number of impellers determines decisively the way the pump works and the strength for liquid moving. If, for example, there is a pump that contains only one revolving impeller, it is called a single-stage pump. If a pump contains two or more revolving impellers, it is called a double- or multi-stage pump. In the application of biology sector, many different types of chemical and biomechanical pumps have evolved; BIOMIMICRY is sometimes used in the development of new types of mechanical pumps. Just like in the early days people tried to study birds in order to enable human flight. With that kind of effort, though not always successful, there are numerous of bio-mimicry cases that help elevating scientific studies.
In addition to the impeller numbers, there are two basic types of pumps, that is, positive displacement and centrifugal. A positive displacement pump makes a fluid move by trapping a fixed amount and forcing that trapped volume of liquid into the discharge pipe. Usually, some positive displacement pumps use an expanding cavity on the suction side, and a decreasing cavity on the discharge side. With the method, liquid flows into the pump as the cavity on the suction side expands and the liquid flows out of the discharge when the cavity collapses. The volume is constant through each cycle of operation. During the operation, safety issue is very important to all the relevant issues.
On the contrary to the centrifugal pumps, a positive displacement pump can produce the same flow at a given speed no matter what the discharge pressure. As a result, positive displacement pumps are constant flow machines. At the same time, however, a slight increase in internal leakage as the pressure increases prevents a truly constant flow rate.
Accordingly, a positive displacement pump must not operate against a closed valve on the discharge side of the pump, as it has no shutoff head like centrifugal pumps. Therefore, positive displacement pumps operating against a closed discharge valve continue to produce flow and the pressure in the discharge line increases until the line bursts, the pump is severely damaged.