![<?echo $_SERVER['SERVER_NAME'];?>](/template/twentyseventeen/skin/images/header.jpg)
The integrated water features, such as sound, light, water, and electricity, are widely used in hotels, railway stations, squares, parks, and residential quarters, becoming an integral part of urban planning and landscaping.
The pump is an indispensable equipment for the fountain. The correct selection relates to the effect of the fountain waterscape. The reliability of the pump is directly related to the normal operation of the fountain engineering system.
Small submersible pumps are widely used in fountain pumps due to their easy installation and low installation cost. In practice, due to the operating characteristics of the fountain pump, ordinary small submersible pumps have emerged as problems with the fountain. Therefore, it is necessary to solve the adaptability problem of small submersible pumps for fountain engineering.
A fountain water system Introduction Fountain is the water pumped into the air, there are vertical jets, oblique jets, rotating jets and other forms. Its main equipment includes pumps, nozzles, connecting pipes, and frequency control inverters (or program control programmable controllers). Auxiliary facilities include water filter cages, underwater lights, and underwater junction boxes.
The shape of the fountain jet is formed by means of a sound control or program control, supplemented by different types of spray heads.
2 The fountain uses the pump 0, ugly parameters to determine the pump (, 7 is determined by the nozzle type, nozzle diameter, jet height, etc.).
(single pump, single nozzle) "for nozzle area; helium for head population pressure; M for nozzle correction factor, for direct flow nozzle, M = 1. / for vertical jet height HH - pump head d nozzle diameter, mm fountain The vertical jet height determination pump is based on the single pump single nozzle and vertical jet calculations.In the fountain project practice, there are single pump multi-spray heads, multi-pump single heads, multi-pump multi-nozzles and oblique jets. Construction Engineering Manual (Architecture Engineering Design Volume 2) 3 Small submersible pumps for fountains Features Small submersible pumps are used in fountains. They have features such as their installation and operation. These characteristics are different from those of small submersible pumps. Agricultural drainage and irrigation applications.
From the installation point of view, there are the following characteristics: The pump outlet connection adopts the hard pipe connection; the length of the random cable for the small submersible pump is generally not enough, and the length of the connection cable of the pump for the fountain project is more than 200m; in order to realize the diversity of fountain modeling , Variability, small submersible pumps installed in parallel with the common way; after the installation of small submersible pump chestnuts, in addition to maintenance, the general potential underwater all year round.
In the programmed operation mode, the pump operation process is: start-run-stop-start. During the operation of the fountain system, the pump is started several times per minute and is in a state of frequent startup. In the sound control operation mode, the rotational speed of any moment of the chestnut is determined by the music frequency at that time, and the motor is changed into a load.
Ordinary pump in program control and sound control mode, the average current of the motor is usually higher than the rated current, for example: the average current when the ordinary submersible pump QY65-7-2.2 operates in the sound control mode is 15A. 4 small submersible for the fountain Common Faults in Pumps In the practice of ordinary small-scale submersible pumps for fountain works, the common operating faults include the following: In the sound-controlled operation mode, for example, QY65-7-2.2, QY40-40-7.5, etc. submersible pump impeller from the keyway Cracked, this phenomenon has never occurred in agricultural drainage. The main reason is fatigue failure caused by variable load operation.
Ingress of water into the junction box causes the insulation to deteriorate, causing serious damage to the motor. This phenomenon occurs in multiple fountain projects and is caused by underwater connection cables. Submersible pumps are usually equipped with cable lengths that do not exceed the length of the pump head, but the distance between the fountain basin and the control room is usually far. Usually, one cable is connected to the cable end of the pump and the connector is under water. When the joint is poorly sealed, water enters the chestnut outlet box along the cable core from the joint.
In a city square fountain project, the pump emits abnormal noise during commissioning, and almost every pump has it. After inspection, the pump's flow-through part has a lot of iron filings, welding flooding, and when the chestnut is operating, friction is formed at the moving and static joint parts of the impeller mouth ring. At this time, the submersible motor runs in an overload state.
Iron scraps and welding slags are left in the pipeline without being cleaned during welding. Because the nozzle diameter of the nozzle is small, it cannot be discharged from the pipeline.
Generally, the QY type pump impeller nut underlays the flat washer, and the thread rotation of the impeller nut is opposite to the direction of rotation of the motor so as to prevent the impeller nut from rotating out in reverse during operation. The QY type pump is applied to agricultural irrigation and drainage. Such a structure is reliable.
The QY type pump is used in the fountain project. Sometimes the impeller nut rotates out of the shaft and the impeller is damaged. This phenomenon is mainly caused by the fact that the actual rotation direction of the pump is opposite to the specified rotation direction during the operation of the pump. For example, the phase sequence is reversed during debugging; when the pumps are connected in parallel, the outlet of the pump is not equipped with a check valve, one is operated while the other is In the stop state (a fountain in the sound control and program control mode), a pump in the stopped state rotates in reverse.
When the pump rotates in the reverse direction, the flat washer cannot be prevented from loosening, causing the impeller nut to rotate out of the shaft in the opposite direction.
5 Design of small submersible pumps for fountains The design of small submersible pumps for fountains should fully consider the characteristics of their use, common faults, and make certain special designs.
Water chestnut motor is best to use variable frequency motor, so that the motor in the constant torque speed control within 5 ~ 50Hz, can fully meet the requirements of program control and sound control; or increase the safety margin of the motor, improve the motor insulation class and cable specifications; rust , anti-corrosion design: mainly from the pump material considerations; increase the strength of the design: In particular, the impeller hub, shaft should be bold, reinforced; standard flange: easy to install the connection; waterproof design: junction box at (see) cable Vulcanization prevents water from seeping into the junction box from inside the cable. Use the same cable as much as possible to avoid cable joints.
6 Conclusion As a general-purpose device, the same pump can be used in many ways, but the operating conditions are not the same, and the pump design requirements should also be different, otherwise the service life will be very different. When small submersible pumps are used as fountain pumps, there must be improvements in design. Our company has done two kinds of pump tests and found that the pump failure rate after the improvement was significantly reduced, and the service life was more than doubled. Of course, the use of a submersible pump for improved submersible pumps with fountains is good for general submersible pumps, but the cost is too low to be necessary.
Vacuum Cleaner,Car Vacuum Cleaner,Mini Vacuum Cleaner,Portable Vacuum
Haotian Cleaning Equipment Technology Co.,Ltd. , https://www.flooringscrubberdryer.com