[Q&A] 4/22/2017
Thread Content
Question: What is the working principle of a centrifugal pump? Answer: Before starting a centrifugal pump, the pump chamber and the suction pipeline are filled with liquid. Once the motor is started, the pump’s shaft drives the impeller to rotate at high speed, causing the liquid inside the pump to spin vigorously. Under the effect of centrifugal force, the liquid is thrown from the inner edge of the impeller to the outer edge, which increases the pressure; the liquid then flows through the discharge chamber to the pump outlet. http://bbs.hcbbs.com/static/image/hrline/4.gif Petrochemical Zone—New Ideas for Energy Saving: The “Creative Thinking” Campaign (Sponsors Wanted; highest returns ever) http://bbs.hcbbs.com/thread-1666758-1-1.html Sponsors are being sought for this campaign; those interested can contact the event organizer. The Petrochemical Deep Processing Edition—sharing pictures of chemical equipment has begun! A vast amount of wealth, as well as Hachuan coins, are waiting for you to claim them: http://bbs.hcbbs.com/thread-1760733-1-1.html. “Petroleum and Chemicals Section”: Notice regarding the collection of chemical technology materials: http://bbs.hcbbs.com/thread-1614796-1-1.html. http://bbs.hcbbs.com/hcdown/data/attachment/forum/201704/07/123053embbjkok61hz6vvz.jpg.thumb.jpg. [Haixin Chemical Cup ★ Spring has arrived for Hachuan Chemicals] Summary post of the 2017 scenery-sharing event (you can take a look at the local landscapes posted by users from various places in your free time): http://bbs.hcbbs.com/thread-1766484-1-1.html
The pump casing and the water intake pipes are filled with water. The electric motor is activated, causing the water and the impeller to rotate at high speed. Under the effect of centrifugal force, the water is thrown out of the impeller and flows through the channels in the volute-shaped pump casing before entering the pressure pipe of the pump. From there, it is sent into the pipeline network. Meanwhile, a vacuum is created at the center of the pump impeller as a result of the water being thrown out, and the water in the reservoir is drawn in due to atmospheric pressure. Water continuously flows in along the suction pipe, enters the impeller’s suction port, and is then thrown out of the impeller by its high-speed rotation and sent into the pressure pipeline, thus enabling the centrifugal pump to deliver water continuously.
A centrifugal pump transfers the mechanical energy of the prime mover to the liquid by means of the action of the rotating impeller on the liquid. As the fluid moves from the inlet to the outlet of the impeller, both its kinetic energy and pressure energy increase. The fluid discharged by the impeller passes through the discharge chamber, where most of its kinetic energy is converted into pressure energy; this fluid is then sent along the discharge pipeline. At the impeller’s inlet, the removal of fluid creates a vacuum or low pressure, and the fluid in the liquid reservoir is pushed into the impeller’s inlet due to the pressure at the liquid surface (atmospheric pressure). Thus, the rotating impeller continuously draws in and discharges fluid.
When the pump is filled with liquid, the rotation of the impeller generates centrifugal force; under this force, the liquid is flung from the center toward the outer edge of the impeller, gaining energy as it is discharged. At this time, the pressure at the center of the impeller is negative, which causes liquid to be continuously drawn into the impeller, allowing the pump to operate continuously.
The impeller rotates at high speed, generating centrifugal force that forces the fluid to flow outward; the reduced pressure at the inlet causes continuous flow of fluid in!
Working principle of centrifugal pumps: Centrifugal pumps operate by using the centrifugal force generated by the rotation of the impeller to move water. Before starting a centrifugal pump, it is necessary to fill the pump casing and the suction pipe with water. Then the motor is started, causing the pump shaft to drive the impeller and the water to rotate at high speed. Under the effect of centrifugal force, the water is thrown toward the outer edge of the impeller and flows through the channels in the volute-shaped pump casing into the pressure pipeline of the water pump. At the center of the water pump impeller, a vacuum is created as water is flung outward due to centrifugal force; under atmospheric pressure, water from the reservoir is forced into the pump casing. The continuous rotation of the impeller causes water to flow in and out under its action, thereby achieving the purpose of transporting water.
A centrifugal pump operates by using the centrifugal force generated by the rotation of the impeller to move water. Before starting a centrifugal pump, it is necessary to fill the pump casing and the suction pipe with water. Then the motor is started, causing the pump shaft to drive the impeller and the water to rotate at high speed. Under the effect of centrifugal force, the water is thrown toward the outer edge of the impeller and flows through the channels in the volute-shaped pump casing into the pressure pipeline of the water pump. At the center of the water pump impeller, a vacuum is created as water is flung outward due to centrifugal force; under atmospheric pressure, water from the reservoir is forced into the pump casing. The continuous rotation of the impeller causes water to flow in and out under its action, thereby achieving the purpose of transporting water.
Centrifugal pumps are generally driven by electric motors; before starting the pump, the pump body and the suction pipeline must be filled with liquid. When the impeller rotates at high speed, it drives the liquid between the blades to rotate as well. Due to centrifugal force, the liquid is thrown from the center of the impeller toward its outer edge (the flow velocity can reach 15–25 m/s), and its kinetic energy increases accordingly. When the liquid enters the pump casing, as the flow channel in the volute-shaped casing gradually widens, the flow velocity of the liquid decreases; part of its kinetic energy is converted into static pressure energy, and as a result the liquid exits through the outlet at a higher pressure. At the same time, a certain vacuum is created at the center of the impeller as the liquid is flung out, while the pressure Pa at the liquid surface is higher than that at the center of the impeller; therefore, the liquid in the suction pipeline enters the pump under the effect of this pressure difference. The impeller keeps rotating, and the liquid is continuously drawn in and pushed out. Since a centrifugal pump is able to transport liquids primarily due to the effect of centrifugal force, it is called a centrifugal pump.
Before operating a centrifugal pump, it is first necessary to fill the pump with the medium to be transported. When a centrifugal pump is in operation, the impeller is driven by the motor to rotate at high speeds (1000–3000 rpm), forcing the fluid between the blades to rotate at nearly constant angular velocity. At the same time, due to the effect of centrifugal force, the fluid moves radially outward from the impeller. As the fluid flows through the impeller, it gains energy and exits the edge of the impeller at high speed to enter the volute. In the volute, the fluid slows down as the flow channel widens; its kinetic energy is converted into potential energy, and it then flows tangentially into the discharge pipe. At the center of the impeller, the fluid is forced to flow from the center toward the outer edges, resulting in low pressure at the center. As a result of the pressure at the inlet, fluid is continuously drawn into the impeller.
The high-speed rotation of the impeller creates a negative pressure at the inlet
A centrifugal pump operates by using the centrifugal force generated by the rotation of the impeller to move water. Before starting a centrifugal pump, it is necessary to fill the pump casing and the suction pipe with water. Then the motor is started, causing the pump shaft to drive the impeller and the water to rotate at high speed. Under the effect of centrifugal force, the water is thrown toward the outer edge of the impeller and flows through the channels in the volute-shaped pump casing into the pressure pipeline of the water pump. At the center of the water pump impeller, a vacuum is created as water is flung outward due to centrifugal force; under atmospheric pressure, water from the reservoir is forced into the pump casing. The continuous rotation of the impeller causes water to flow in and out under its action, thereby achieving the purpose of transporting water.