Overview of shielded pumps

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This post was last edited by Xinhu Shielded Pump on 2010-11-12 at 21:56. Overview of shielded electric pumps: Ordinary centrifugal pumps are driven by connecting the impeller shaft of the pump to the motor shaft through a coupling, allowing the impeller to rotate together with the motor. In contrast, shielded pumps are sealless pumps; both the pump and the drive motor are enclosed within a pressure vessel filled with the medium to be pumped. This pressure vessel has only static seals, and an electrical winding set is used to generate a rotating magnetic field that drives the rotor. This design eliminates the rotating shaft sealing mechanism found in conventional centrifugal pumps, thereby achieving complete leaklessness. 　　A shielded pump combines the pump and the motor together; the rotor of the motor and the impeller of the pump are mounted on the same shaft. A shielding sleeve is used to separate the rotor from the stator of the motor. The rotor rotates within the medium being transported, with power being transmitted to it through the magnetic field of the stator. Furthermore, the manufacturing of shielded pumps is not complex; their hydraulic section can be designed and manufactured according to the structural formats commonly used in centrifugal pumps as well as relevant standard specifications. Structural type: 1. Integrated structure of motor and water pump, with the water pump and motor connected on the same axis ； 2. The inside of the motor stator and the outside of the rotor are equipped with shielding sleeves, and the inside of these shielding sleeves is connected to the inside of the pump ； 　　3. The installation methods are divided into horizontal and vertical types. 4. The motor is equipped without a cooling fan; it is cooled by the circulating medium between the stator and the rotor, with additional cooling also provided via the surface of the motor frame. Product features: 1. Integrated motor and pump design, with all static seals in use, ensuring complete leak-free operation of the electric pump ； 　　2. A fully enclosed, leak-proof design that enables the transport of toxic and hazardous liquid substances ； 　　3. The use of a shielded water-cooled motor along with the elimination of cooling fans enables this pump to operate in a low-noise manner, making it suitable for applications where low environmental noise levels are required ； 　　4. Graphite sliding bearings lubricated by a conveying medium result in lower operating noise and eliminate the need for manual oiling, thereby reducing maintenance costs ； In recent years, bearing materials have included silicon carbide SIC and superhard materials, which offer a longer service life than graphite bearings. 　　5. The vertical structure can be installed on the pipeline like a valve, making installation easy and fast; during maintenance, only the motor and impeller need to be removed, without the need to take down the pipeline. 　　6. It can be installed and operated in conjunction with shock absorbers or shock pads, reducing the noise generated by the electric pump during operation. Specific forms of shielded electric pumps: 1. Basic type for transporting ordinary materials ； 　　2. Counter-current and reverse-pressure types for transporting volatile materials ； 　　3. High-temperature separation type for transporting high-temperature materials, usually at temperatures below 350 degrees ； 　　4. Slurry type for transporting materials with particles ； 　　5. High-melting-point type for transporting high-melting-point materials ； 　　6. For self-priming types whose material transfer level is below the pump’s suction inlet, the self-priming height should be less than 5 meters. Application areas of shielded electric pumps – 1. Civil use ； 　　 1. Ground-source heat pump air-conditioning circulating water system ； 　　2. Lithium bromide air-conditioning unit air-conditioning pumps, transformer oil pumps, locomotive pumps, etc ； 　　3. Heating and cooling circulating water system ； 　　4. Fire water pressure boosting system ； 　　5. Tap water pressure boosting system. 　　II. Industrial, Military, and Aerospace Applications 　　1. Transportation of toxic and hazardous liquids for use in the chemical and pharmaceutical industries ； 　　2. Fuel filling of rockets for aerospace use before launch ； 　　3. Nuclear-grade shielded electric pumps for nuclear power plants.