Shanghai Xinhu Electric Motor Factory Co., Ltd., as a domestic enterprise specializing in the production of shielded electric pumps, was established in 1956 with a long history, and is the drafting unit of the national industry standard of "Shielded Electric Pumps and Shielded Motors". For more than 50 years, Shanghai Xinhu has been developing new products according to the current and potential market demand, and the products of canned pumps are among the best in China. Shanghai New Lake adopts advanced technology, equipment, technology, detection means and management means, and has 25 series of shielded electric pump products with thousands of specifications, which successfully solves the leakage problem in fluid transportation. Widely used in petroleum, chemical industry, refrigeration, air conditioning, national defense, nuclear industry and other fields, it is the largest shielded electric pump manufacturer in China. Product uses: domestic hot water circulation, liquid circulation of cooler and air conditioning system, water heater pressurization, solar energy, heating system, floor heating pressurization circulation, temperature adjustment, etc.
1. adopts domestic advanced hydraulic model, with high efficiency and good cavitation resistance.
The impeller outlet angle of our hydraulic model is about 28 ~ 35 (), and the blade outlet angle is 22.5, so the efficiency is generally low. ), the same flow and lift, reducing impeller diameter and disc loss can generally improve the efficiency of the pump, which is about 5%~8% higher than that of foreign-funded enterprises. A Q: 75m3/h and H: 30m pump produced by our company for military submarines has a pump efficiency of 72% and that of Dalian Company is 63%.
2. Automatic balance structure
The structure of automatic balance of axial thrust is adopted, that is, when the pump is running normally, the end faces of the front and rear bearings do not contact the thrust plate, and only bear a small axial force at the moment when the pump starts and stops, which greatly prolongs the service life of the bearings.
3. Adopt the latest design of high-efficiency motor mold, which has high motor efficiency, high power factor and less heat generation.
Using the motor optimization design method, the motor efficiency is generally between 75% and 80%, and the temperature rise of the motor when it is fully loaded is about 20~30K. Vacuum paint dipping and low-pressure vacuum drying technology are adopted in motor manufacturing, which improves the insulation performance of the motor and prolongs its service life.
4. The motor rotor is stacked with chutes, which is beneficial to reduce electromagnetic vibration and electromagnetic noise.
However, other companies adopt the straight slot stacking technology, which is convenient, but the electromagnetic vibration and noise are large. The vibration acceleration of the electric pump produced by our company is lower than 120 dB by authoritative research institutions.
5. The bearing monitor adopts the latest design, and the frequency conversion and power frequency modules are unified.
It can be used alternately under two power supply conditions. Higher sensitivity and reliability.
6. The working flow range of the pump is 30%~ 120% of the rated flow.
All pumps in our company adopt automatic balance structure. When the flow rate changes, the gap between the back cover plate of the impeller and the front bearing seat changes, and the axial force is automatically adjusted, so that the rotor is always suspended, which greatly improves the service life of the bearing, expands the working range of the pump and makes the pump run more reliably.
7. The vibration noise of the pump is low.
Due to the automatic balance structure of the impeller, the dynamic balance accuracy of the rotor assembly is as high as G2.5, and the vibration value of the pump in the working process is extremely small, which can reach below 2.8mm/s for small pumps and below 4.5mm/s for large pumps.
8. There are all kinds of pumps.
On the basis of conventional pumps, pumps with partial flow conditions are added. Vortex pump and double-suction pump can meet the requirements of flow conditions as small as 0.5m3/h and as large as 900m3/h. The maximum lift is 500m, the maximum service temperature is 450 degrees, the minimum service temperature is-100 degrees, the maximum design pressure is 60kg, and the maximum power160kW.
Optimize the product structure to make the product structure design more reasonable.
For the reverse circulation pump conveying easily vaporized medium, our company adopts the way of drilling holes on the shaft and pressurizing the secondary impeller at the rear, which avoids the vaporization of motor circulating medium, reduces the tail reverse circulation pipeline and simplifies the field piping.
The high temperature pump adopts detachable water jacket and detachable heat exchanger structure, which is convenient for maintenance and scale removal.
For the basic pump, the internal structure adopts self-exhaust structure (the exhaust valve can be cancelled as needed) to avoid toxic and harmful gases polluting the environment and hurting the operator when exhausting.
The self-priming pump adopts a new injection structure, which greatly improves the self-priming performance.
10. Materials
Main materials: pump body, impeller, front and rear end covers, shaft and motor flange are all made of stainless steel, which has good corrosion resistance and welding performance;
Shielding sleeve: HASTELLOY-C with the best corrosion resistance and welding performance is selected for stator and rotor shielding sleeve, and the material is imported from the United States;
Bearing, shaft sleeve and thrust plate are made of silicon carbide (SiC) with superior comprehensive performance, and the purity is more than 99%.
Motor insulation grade: in order to improve the insulation aging performance of motor, choose high temperature resistant H grade;
1 1. Safety and protection measures
Explosion-proof structure (standard configuration)
The new Shanghai standard structure is explosion-proof, and various explosion-proof certificates have been obtained, which can provide D Ⅱ BT1~ T4.
DⅱCT 1 ~ T4, protection grade IP54.
Temperature protection
The standard configuration of Shanghai New Lake adopts thermocouple temperature protector, which is embedded in the stator winding to directly protect the stator winding. The protection temperature of class H insulation is set to 180℃.
HPB bearing monitor (standard)
The operation of shielded electric pump can be accurately mastered from the outside without disassembling the machine. The HPB meter is marked with three areas: green, yellow and red, and the green area indicates normal operation; The yellow area indicates the need for maintenance; The red area indicates that a fault has occurred and the machine must be disassembled for maintenance. Tell the operator how to take measures in this intuitive way.
HPB meters also have protection against phase reversal and phase break.
Idle speed protector (optional configuration)
If necessary, you can also choose an idling protector to prevent the liquid from being evacuated.
12. Adoption of standards
Flange standards: GB, ANSI, ASME, DIN, HG, etc.
The manufacturing standard can be ISO 15783-2002.
API6 10, API685, etc.
13. Quality assurance
At present, Shanghai New Lake has obtained ISO900 1, ISO 1400 1, CE certification, has a perfect quality assurance system, and parts processing can be traced back. All materials are provided by qualified subcontractors, which can provide a complete material certificate and can also be reinspected according to customer requirements.
At present, our products are widely used in various industries. Domestic heating and air conditioning systems include Zhongnanhai and the State Council, Changsha Yuanda Air Conditioning Company, Zhejiang Lianfeng Refrigerator Company, Qingdao LS Lexing Air Conditioning Company, Carrier China No.1 Refrigerator Factory, Morita Chemical (Zhangjiagang) Co., Ltd., Jiangsu Feixiang Chemical, Tianjin Mainland Hydrogen Production, Shanghai Chenguang Polymer Technology Company, Nantong Jiuding Biological Engineering Co., Ltd., Anhui Fengyuan Group, Henan Luoyang Zhongsi High-tech Co., Ltd., Henan Zhengzhou Thermal Power Company, Henan Zhongyuan Environmental Protection Company, Xinxiang Thermal Power Company In 2008, the company's high-tech product PB shielded pump was selected by Shanghai Qiyao Electric Power Technology Co., Ltd. and applied to a nuclear submarine in China, which successfully opened up a new field of shielded electric pump in our company.