2017年1月22日星期日
2017年1月21日星期六
2017年1月19日星期四
2017年1月18日星期三
2017年1月12日星期四
2017年1月11日星期三
Submersible pump selection common sense
Companies specializing in the production wells with submersible pumps products, with advanced quality assurance system, scientific management and testing methods. The company has strong technical force and rich experience in production, advanced production equipment, sophisticated, measurement, laboratory, complete with detection equipment. Technical quality of the company summary wells with submersible pump procurement of small knowledge selection, hoping to help pump pump users to choose the majority of elections.
Well with the submersible pump selection, look at the wells of the water, selected wells withsubmersible pump flow, each well has an economically best water, wells with submersible pump flow should be equal to or less than the bottom of the water level When the water volume is less than half of the well depth, the selected pumping volume is larger than that of the well. When the well is pumped, the well wall will collapse and affect the service life of the well. If the pumping capacity is too small, the efficiency of the well will not be fully exerted. Therefore, the best method is to conduct a pumping test wells, underground water may provide the greatest amount of water, this is done in order to select wells with submersible pump flow. Manufacturers will flow, lift, motor power, speed and so hit the pump, pump casing on the nameplate or the number marked on the specification as the standard.
Downhole water level descending depth and pipeline water loss pipeline to determine the actual needs of the submersible pump wells, wells with submersible pump head, is equal to the water level to the water storage tank vertical distance plus the loss of the lift. Loss of head is usually a net head of 6-9%, generally 1-2m. Well with the bottom of the submersible pump impeller into the water depth of 1-1.5m best. The total length of the downhole portion of the submersible pump tubing shall not exceed the maximum length of the well defined in the instructions of the submersible pump.
Underground water contains sand, more than one ten thousandth of the wells can not be installed well with submersible pumps. Because the underground water contains too much sand, such as more than 0.1% of the time, will accelerate the progress of the wear of rubber bearings, causing pump vibration, but also affect the life of the pump. Above is the submersible pump selection must consider several key factors.
2017年1月9日星期一
Characteristics of Submersible Pump
Submersible pump sewage What are the characteristics? Today, we come to talk to you and simple.
First, the compact structure, covers an area of small submersible sewage pump submersible because of the work, it can be directly installed in the sewage pool, no need to build a special pump room for the installation of pumps and machines, you can save a lot of land and infrastructure costs.
Second, easy installation and maintenance Small submersible sewage pump can be free to install, large submersible sewage pump are generally equipped with automatic coupling device can be automatically installed, installation and maintenance is very convenient.
Third, the continuous operation of long submersible sewage pump As the pump and motor coaxial, shaft short, light weight of the rotating parts, so bear the bearing radial load is relatively small, life expectancy is much longer than the average pump.
Fourth, there is no cavitation damage and irrigation water and other issues. In particular, the latter point to the operator to bring a great deal of convenience.
Fifth, vibration and noise, low motor temperature, no pollution to the environment.
2017年1月8日星期日
2017年1月6日星期五
2017年1月5日星期四
2017年1月4日星期三
Pump the risk of vaporization
1. Produce noise and vibration
As the vaporization of the pump vaporizes continuously in the high-pressure zone and is accompanied by a strong water hammer, the danger of the vaporization of the pump is that it generates noise and vibration, and can be heard like a crackling popcorn, The presence of vaporization, in which case a small amount of air can be pumped to buffer the noise vibrations and damage to the metal, is widely used in hydraulic turbines but is seldom used in pumps.
2. Overflow components cavitation
Pump for a long time under the conditions of work in the vaporization, the pump flow components in some parts of the vaporization will be destroyed, that is, cavitation. This is due to vaporization
In the metal surface occurs, the pump will be the risk of vaporization of the metal surface will be like a sharp knife like a sharp impact, the metal will appear pitting that perforation. Sometimes the metal particles loose and peeling and appear honeycomb, cavitation in addition to the mechanical force, but also accompanied by electrolysis, chemical corrosion and other complex role.
Practice has proved that the cavitation is the location of the vacuolar rupture. So often in the round after the entrance and pressure water chamber inlet parts found cavitation traces, but the vapor generated at the entrance of the impeller, want to cure the vaporization must prevent the impeller at the entrance to produce vacuoles.
3. Performance degradation
The energy exchange between the impeller and the liquid is disturbed and destroyed when the pump is vaporized. The performance of the external characteristic is the head flow curve, the shaft power flow curve and the efficiency curve. In severe cases, the flow in the pump will be interrupted, resulting in the pump not working. However, the performance of the blue line in the early stage of vaporization of the pump did not change significantly, when the performance curve changes, the vaporization has developed to a certain extent.
The performance curves of different specific speed pumps differ in the form of vaporization. For the low specific speed pump, because the blade flow channel is narrow and long, so in the event of vaporization of cavitation easy to fill the entire flow channel, and thus the risk of water vapor pump is a sharp decline in performance curve form. With the increase in specific speed, the blade flow channel to the trend of wide and short change, so the development of cavitation from the nascent to the entire flow channel has a transition process, the corresponding pump performance curve is slowly declining to a flow Showing a sharp decline. Axial pump performance curve in the entire flow range is only slow down. In addition, the multi-stage pump vaporization is limited to the first level, so the performance degradation than single-stage single-suction centrifugal pump to small.
2017年1月3日星期二
Importance of heat pump installation
In order to use correctly, only adequate understanding is the right choice. Want to play a better heat transfer oil pump high efficiency, high performance, extend the life of heat pump, the installation process should pay attention to the following aspects.
1, prior to the relevant instrument should switch on the power switch, when the heat transfer oil pump to normal speed, and the instrument shows a considerable pressure, the gradual opening of the output valve on the pipeline and adjust to the required conditions. The pump in the output line on the closure of the case, the pump can not work more than 3 minutes;
2, the beginning of operation, the production process should be slowly heating equipment to 100-130 degrees, heat transfer oil pump and maintain the temperature to continue to run dehydration degassing to the heat transfer oil in the water completely evaporated before the equipment heating To operating temperature;
3, the first 3-4 hours in operation, the equipment is heated to operating temperature, turn off the heat pump, check the pump shaft and motor shaft coupling coaxiality, pump shaft and motor shaft deviation should be controlled within the allowable range , The pump shaft should be light and flexible by hand rotation and vibration-free rotation, adjust the belt coupling of each screw to see if there is loosening. Such as heat transfer oil pump can not meet the above requirements should be re-adjusted;
4, the thermal conductivity of each ball bearing ball after running 3000 hours, you must remove the cleaned with diesel, check for damage, if damaged, must be replaced with new bearings;
5, by impeller side of the ball bearing installation, heat pump dust cover side of the impeller to be installed, before driving into the thermal oil lubrication;
6, by the coupling side of the ball bearing, with calcium-based high-temperature grease, the bearings to re-install, heat pump dust cover side of the same impeller side to install, install grease.
7, the installation must be in the thermal pump inlet and outlet near the pipeline to play support to prevent heat conduction pump to bear the weight of the pipeline directly affect the pump life.
Whether you have any problems during the installation process, please feel free to contact our professional and technical personnel, your questions will be properly addressed and resolved.
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