In the process of pump operation, the pressure inside the pump is changing at any time, when a part of the pressure lower than the minimum pressure of liquid gasification pump, it will automatically generate gas inside the pump. If this gas has been generated, will burst within the pump sound, so cavitation from the sensory point of view is very easy to judge.
Pump cavitation is generally operating and external conditions caused by the inappropriate, Lanshen group in the pump design and testing process, will also test the pump cavitation conditions. In general, the pump cavitation is caused by the following several reasons.
First, the suction pump is higher than the actual suction lift available. This can happen if the height of the pump is too high. Because the actual suction pump is too large, will lead to the pressure drop inside the pump is very low, it is prone to cavitation.
Second, the suction pump is too far. When pumping a liquid pump, if the suction process is too far away, may have some unforeseen resistance, the resistance will lead to the actual pump impeller to reduce the liquid pressure, resulting in the impeller below the spin nest, also produce cavitation.
Third, the pump water conditions are not stable. If the pump inlet pipe is curved, when the water, all parts of the flow rate is not the same. Differences in flow rate can lead to differences in liquid pressure, if the local pressure is too low, cavitation occurs.
Fourth, the use of local air pressure is too low. If the pump installed in the high altitude areas of the plateau, the pump inlet pressure will be reduced, but also prone to cavitation.
Sources of pool contaminants:
a. Human dirt, bacteria, viruses, urea and so on
b. Dander, hair chips
d. Human exudates: oil, sweat, mouth and nose secretions
e. Foreign objects: dust, leaves, insects
f. Pool breeding fungi and algae
Water treatment purposes
Artificial swimming pool water in the pool and pipeline system at a certain rate of circulation, due to swimmer, air and supplementary water into the organic and inorganic pollution, the pool of water may have the following problems:
First, the growth of bacteria
The amount of bacteria in the raw water is usually in the range of a few to several tens of milliliters per liter, but in a swimming pool where the temperature is adequate, the nutrient source is sufficient and the atmosphere is fully exposed, the bacteria can breed five to ten times per milliliter in three to five hours (Or even more), which contains a certain amount of the body into the pathogen.
Second, water turbidity
Water turbidity is a lot of aspects, water impurities, organic matter content is the main reason.
Third, the water causes irritation to the skin, eyes and hair
As the pool of water PH, alkalinity inappropriate, or the accumulation of organic pollutants, the human body surface and even the respiratory tract to stimulate
Fourth, the water color change
Normal swimming pool should be microstrip blue clear water, but the raw water into the metal ions and the growth of algae in the pool water will cause the water discoloration
Fifth, pool water blistering
Accumulation of organic matter or insufficient water may cause foam in the water
These factors cause the water quality problems, it will affect the swimmer’s physical health and sensory comfort, even leads to different degrees of infection swimmers, such as cough, dermatitis, fever, asthma and even more serious infectious diseases.
Submersible sewage pump is provided which is adapted for location in a sump or the like, and which includes a motor case, a driving motor, an impeller case, and an impeller located in the impeller case, the impeller defining a back shroud space between its upper face and the confronting, superjacent portion of the impeller case.
The usual submersible pump is sealed against fluid entry for operation in a submerged condition, and is designed to be cooled by the liquid material within which it is submerged. Dangerous overheating can occur if such a pump is not operated in a submerged condition, and such overheating may result in burning or explosion of the motor.
The apparatus includes a vent which opens at one end into the back shroud space and at the other end opens to the exterior of the impeller case. Whenever air is drawn or injected into the low pressure vortex area of the sewage pump for controlling the amount of liquid discharged, the air collecting in the back shroud space is constantly vented to facilitate operation of the impeller and reprime the pump.
With the increasing popularity and expansive application of the submersible pumps for well,submersible pumps for well have to be adapted in different environments. With the accumulation of market feedback data, the application of CAD, CFD and other computer-aided design, manufacturing and supporting the use of auxiliary test software, as well as fluorine plastic, lined with plastic, rubber lined, sprayed ceramics and other new materials and new technology, submersible pump for well is gradually developing towards high efficiency, energy saving, environmental protection direction. details as follows:
① Technological innovation will drive new technology, new materials are constantly used in the production of submersible pumps for well. For example, the traditional casting process to a more advanced stainless steel stamping welding technology development. Core components of stamping and welding stainless steel multi-stage pumps made of stainless steel sheet, with molding and high reliability, good sealing, high precision, etc., the hydraulic pump efficiency and performance generally better than the casting process to produce wells with submersible pumps, stainless steel stamping and welding processes are wells with submersible pumps future trends.
②Design is more efficient, energy-saving, environmentally friendly. For example, oil-filled motor design to more environmentally friendly water-filled motor design development. Oil-filled submersible motor cavity is filled with a medium machine oil, and water-filled submersible motor cavity filled with the medium is water, one of the advantage of zero pollution of water bodies, more environmentally friendly. In addition, with frequency conversion technology in motor design and gradually spread, wells with submersible pumps will be more efficient and energy saving in the future.
③The overall design is developing to removable modular design, namely modular combination motor and pump and other components for easy removal and replacement of damaged parts, to prolong the life of the pump, and reduce costs.