HM380 Cavitation in Pumps
I. Product overview
1.1 Introduction to cavitation
Water pump cavitation refers to the process in which bubbles in the
low-pressure area of the water pump flow system are compressed and
quickly collapsed as the water reaches the high-pressure area,
which causes the deterioration of hydraulic performance and the
damage of the flow components.
When the effective cavitation margin of the water pump device is
less than the necessary cavitation margin of the water pump, and
the partial pressure in the pump drops to the saturated
vaporization pressure at the liquid temperature, the impurities,
tiny solid particles or liquid interface (liquid and solid) in the
liquid The gas nucleus existing in the gap between the contact
surface) rapidly grows into a cavitation bubble, and reaches the
high pressure area with the water flow, and is quickly collapsed by
the compression of the surrounding liquid. In the cavitation
collapse zone, the metal surface is subjected to a water hammer
force, the frequency of which can reach tens of thousands of times
per second, and it acts on a very small area, so its stress can
reach thousands of atmospheric pressure. Frequent application of
such a large stress causes plastic deformation and hardening of the
metal surface layer, resulting in local fatigue and micro cracks,
which promote the development of cavitation. The metal components
are broken and peeled off. Cavitation may occur on the back and
front of the impeller blades, or between the outer edge of the
impeller and the wall of the impeller chamber. Generally, water
pump cavitation reduces the flow, head, power and efficiency of the
pump, causing unit vibration and noise, shortening the life of
equipment, and affecting engineering safety. The situation is more
serious with pumps that take water from streams with high sand
content
1.2 Causes of water pump cavitation:
When the inlet pressure of the pump is lower than the saturated
vapor pressure at this temperature, the liquid will vaporize. At
the same time, gas dissolved in the liquid may escape from the
liquid, forming a large number of small vapor bubbles, which follow
the liquid. When flowing into the flow channel of the impeller,
when the pressure generated by the rotation of the impeller is
greater than the saturated vapor pressure, these small vapor
bubbles re-condensate and extinguish, forming a cavity. At this
time, the surrounding liquid rushes toward the cavity at a very
high speed, and the particles of the liquid collide with each other
to form a local hydraulic shock, which makes the local pressure
reach hundreds of atmospheres. The larger the bubble is, the
greater the local water hammer will be when it is condensed and
extinguished. The speed of this hydraulic impact is very fast, with
a frequency of up to 2500 times/s, and violent impact occurs on the
surface of the impeller, causing mechanical corrosion. The
above-mentioned comprehensive phenomenon of vaporization,
condensation, impact and metal erosion of the liquid is called
cavitation.
1.3 Cavitation damage
When the vapor bubble is extinguished, the liquid particles collide
with each other, which will produce noise. When the cavitation is
severe, vibration will occur. The flow rate, lift, and efficiency
will be significantly reduced, and the phenomenon of "evacuation"
will occur. At the same time, the impeller will be thinned due to
cavitation erosion. Even the blade and cover are penetrated.
Cavitation leads to poor performance of the pump, unstable
operation of the device, fatigue and erosion of metal surface
materials, and increased noise and vibration. Therefore, it is
necessary to analyze, research and monitor water pump cavitation in
the design and operation management, and take effective protective
measures in time
1.4 Product introduction
This product can be used to demonstrate the cavitation effect of
the centrifugal pump impeller. The pump casing and the pipes on the
inlet side of the pump are made of transparent plastic to observe
the cavitation process. Take a photo with a short exposure time
(flash), this method can capture an excellent image of bubbles. The
valves at the inlet and outlet of the pump can adjust the flow and
pressure accordingly. The pressure on the inlet and outlet sides
are displayed on two pressure gauges. The water tank is equipped
with a heater, and the water temperature can be controlled. At the
same time, the water temperature, flow rate and pump speed in the
water tank are displayed. The water is cooled by the water supply
system.
II. Performance parameters
Dimensions: LXWXH 1000x630x590mm
Weight: <70kg
Voltage: AC220V 50HZ
Water pump: power 370W, flow rate 3m³/h, head: 14 meters
Water tank: 20L
Pressure (inlet): -1…0bar
Pressure (outlet): 0…1,5bar
Temperature: 0…60°C
Product Details and Warranty
We supply suitable spare pats according to experiment requirement,
our products take aluminum structure, A4 paper dimension aluminum
and plastic hanging box structure.
We supply 3 years warranty time.
Packaging & Delivery
Package details: plastic film+ plastic foam + plywood box with
pallet, and for equipment dimension less than 1CBM, we supply
plastic film+ plastic foam+ fine carton.
Arrange delivery within 45 days upon receipt of payment.
Please see below photo for detailed package.
Training Room Photo
Company Information
We supply professional educational training equipment and technical
teaching equipment, which has been widely applied in Engineering
Universities, Polytechnics, Technical Institute, Vocational Schools
as well as Industry workforce Development Programs and Training
Center. Our products allow students to learn and experiment through
valuable hands-on experience, and the technology covered by our
training equipment provides knowledge, experiments and didactic
skills development that are of critical importance to today´s and
tomorrow´s careers.
Photo for Clients Visiting Factory
Service
We supply supply7*24 hours service, customer design service, OEM
service, buyer label service. With professional engineers team and
sales team, we assure you good product quality.
Certificate
Our products takes ISO9001 product management system.
| No. | Feature Name | Details |
| 1 | Customer design | Yes |
| 2 | Warranty | 1 year, 2 years, 3 years or 5 years according to client
requirements |
| 3 | Package | Plastic film+ carton+ Fine plywood |
| 4 | Products standard | International didactic equipment standard |
| 5 | Application range | Educational equipment for university, college, vocational training
centers |
| 6 | Company philosophy | Supply best quality Chinese products to the worldwide schools. |
| 7 | Self owned brand | Shouldshine, SSEDU, JSS. |
| 8 | Production time | From 10 days to 60 days according to different items |
| No. | Feature Name | Details |
| 1 | Customer design | Yes |
| 2 | Warranty | 1 year, 2 years, 3 years or 5 years according to client
requirements |
| 3 | Package | Plastic film+ carton+ Fine plywood |
| 4 | Products standard | International didactic equipment standard |
| 5 | Application range | Educational equipment for university, college, vocational training
centers |
| 6 | Company philosophy | Supply best quality Chinese products to the worldwide schools. |
| 7 | Self owned brand | Shouldshine, SSEDU, JSS. |
| 8 | Production time | From 10 days to 60 days according to different items |
