Function characteristics and selection of canned motor pump

4 F, m& ?: `2 ]$ `& F| Blue Pump Technology Forum With the development of the chemical industry and the improvement of people’s awareness of the environment and safety, the requirements for chemical pumps are getting higher and higher. Certain pumps have put forward absolutely no leakage requirements, this demand has promoted the development of canned motor pump technology. Canned motor pumps can be absolutely leak-free because there is no shaft seal, so the use in chemical plants has become more and more common. Pump Valve Technology Forum 3 l- k( e. w* f1 　 Principle and structural characteristics of canned motor pump pumpvip.com 5 J( Y- z% D4 b The driving of ordinary centrifugal pump is to connect the impeller shaft and electric shaft of the pump through a coupling Are connected to make the impeller and the motor rotate together to work, while the canned motor pump is an unsealed pump. Both the pump and the drive motor are sealed in a pressure vessel filled with the pumped medium. The pressure vessel has only static seals and is A wire set to provide the rotating magnetic field and drive the rotor. This structure eliminates the rotary shaft sealing device of the traditional centrifugal pump, so it can be completely leak-free. | Pump Technology Forum | www.pumpvip.com: Pump Theory and Design, CFD simulation optimization, manufacturing testing, installation and commissioning, pumping station design, operation and maintenance and sealing technology valve design and other technology and information exchange integrated industry information platform, and strive to be the Chinese pump, valve, sealing industry experts, scholars and Relevant people create a good technology exchange platform! Enable members to learn from each other’s strengths in exchanges, improve and sublimate their professional skills, serve the pump and valve industry, and increase power for the pump and valve industry. 1 i y’C; O. c( ^3 s2 ^- R The canned motor pump connects the pump and the motor together, the rotor of the motor and the impeller of the pump are fixed on the same shaft, the rotor and the stator of the motor are separated by the shielding sleeve, and the rotor runs in the conveyed medium , Its power is transmitted to the rotor through the stator magnetic field. | Blue Pump Technology Forum” }0 V3 L% v) E& w% Q In addition, the manufacture of canned motor pumps is not complicated, and its hydraulic end can follow the usual structure of centrifugal pumps. Design and manufacture according to relevant standards and specifications. ‘g% B” ?! F, J6 {2 |. B Pump Valve Technology Forum

2　The advantages and disadvantages of canned motor pump # 6 ]( S$ Z k- X’R2 C; [% _8 t pump, pump forum, heat pump technology, water pump installation, mechanical seal, cfd software, desulfurization, nuclear pump, pump technology, fluid Mechanics, steam turbine principle, dynamic balance calculation, water pump parameters, water pump forum, pumplinx 2.1 　 the advantages of canned motor pump, pump forum, heat pump technology, water pump installation, mechanical seal, cfd software, desulfurization, nuclear pump, pump technology, fluid mechanics, steam turbine Principle, dynamic balance calculation, pump parameters, pump forum, pumplinx9 p’c/ k) x7 x, o. F(1) fully enclosed. There is no dynamic seal in the structure, only static seal at the casing of the pump, so it can be completely leak-free, especially suitable for transporting flammable, explosive, precious liquids and toxic, corrosive and radioactive liquids. Pump Valve Technology Forum; B( f” v3 W; e3 B0 A7 F(2) High safety. There is a shielding sleeve for the rotor and stator so that the rotor and stator of the motor do not contact with the material, even if the shielding sleeve is broken, it will not produce The risk of external leakage. H4 f5 ?: [: {& I8 O (3) Compact structure and small footprint. The pump and the motor are integrated, so disassembly and assembly do not need to be centered. Low requirements on the base and foundation, and daily maintenance work Small quantity and low maintenance cost. pumpvip.com7 T1 K: E5 d: p$ Q(4) Smooth operation, low noise, no need to add lubricating oil. Because there is no rolling bearing and motor fan, no need to add lubricating oil, and noise Low. Pump, pump forum, heat pump technology, water pump installation, mechanical seal, cfd software, desulfurization, nuclear pump, pump technology, fluid mechanics, steam turbine principle, dynamic balance calculation, water pump parameters, water pump forum, pumplinx3 X3 x5 G7 b% [ (Y1 {4 ]) I(5) has a wide range of applications. It can meet the requirements for various working conditions such as high temperature, high pressure, low temperature, and high melting point. (A( l6 i6 q9 o1 b+ G# Z/ u; Ppumpvip.com 2.2 Disadvantages of canned motor pumps 4 (b3 @4 J! G/ | (1) Since canned motor pumps use sliding bearings and are lubricated by the conveyed medium, media with poor lubricity should not be transported by canned motor pumps. Generally suitable for canned motor pumps The viscosity of the medium is 0.1～20mPa.s. 9 Q! e; R2 |8 J+ h” H6 t| Blue Pump Technology Forum|www.pumpvip.com: Collection of pump theory and design, CFD simulation optimization, manufacturing inspection, installation and debugging , Pumping station design, operation and maintenance and sealing technology valve design and other technology and information exchange integrated industry information platform, and strive to create a good technology exchange platform for experts, scholars and related persons in the pump, valve, and sealing industries in China! Members can learn from each other’s strengths in exchanges, improve and sublimate their professional skills, serve the pump and valve industry, and increase power for the pump and valve industry.

(2) The efficiency of canned motor pumps is generally lower than that of single-end mechanical seal centrifugal pumps, but roughly equivalent to that of double-end mechanical seal centrifugal pumps. | Blue Pump Technology Forum | www.pumpvip.com: Comprehensive industry information integrating technology and information exchanges such as pump theory and design, CFD simulation optimization, manufacturing inspection, installation and commissioning, pump station design, operation and maintenance, and sealing technology, valve design, etc. Platform, and strive to create a good technology exchange platform for experts, scholars and related persons in China’s pump, valve, and sealing industries! To enable members to learn from each other’s strengths in exchanges, improve and sublimate their professional skills, serve the pump and valve industry, and increase power for the pump and valve industry. / f2 L0 w* X6 ]) N7 Q(3) If the canned motor pump is operated for a long time under the condition of small flow, the efficiency of the canned motor pump is low, which will cause heat generation and evaporation of the liquid, which will cause the pump to run dry and damage the sliding bearing. pumpvip.com H! Q ?$ ~; N5 h0 b N3　The type and scope of canned motor pump U/ g( K/ y% j: i9 j; j| And the presence or absence of particles, canned motor pumps can be divided into the following types: | Blue Pump Technology Forum) L0 `, y* O3 U- g! U L(1) Basic Pump Valve Technology Forum& o’K9 e: x ; Q& R o$ a The temperature of the conveying medium does not exceed 120℃, and the head does not exceed 150m. Various other types of canned motor pumps can be obtained through modification and improvement on the basis of the basic type. | Blue Pump Technology Forum | www.pumpvip.com: Comprehensive industry information integrating technology and information exchanges such as pump theory and design, CFD simulation optimization, manufacturing inspection, installation and commissioning, pump station design, operation and maintenance, and sealing technology, valve design, etc. Platform, and strive to create a good technology exchange platform for experts, scholars and related persons in China’s pump, valve, and sealing industries! To enable members to learn from each other’s strengths in exchanges, improve and sublimate their professional skills, serve the pump and valve industry, and increase power for the pump and valve industry. % F) `+ Y2 P6 m: A(2) Reverse circulation pump valve technology forum, k+ O8 x. a) b! ?; O In this type of canned motor pump, the liquid used to lubricate, cool the bearing and cool the motor The flow direction is exactly opposite to the basic type. Its main feature is that it is not easy to produce cavitation, and it is especially suitable for the transportation of easily vaporized liquids, such as liquefaction, monochlorine, etc. , L3 E; W0 X8 }- v’`! ^9 D| Blue Pump Technology Forum|www.pumpvip.com: Pump theory and design, CFD simulation optimization, manufacturing inspection, installation and commissioning, pump station design, operation and maintenance and A comprehensive industry information platform integrating technology and information exchanges such as sealing technology, valve design, etc., strives to create a good technology exchange platform for experts, scholars and related persons in China’s pump, valve, and sealing industries! To enable members to learn from each other’s strengths in exchanges, improve and sublimate their professional skills, serve the pump and valve industry, and increase power for the pump and valve industry. To

(3) High temperature type / M1 @+ C [7 z+ bpumpvip.com Generally, the maximum conveying medium temperature is 350℃, the maximum flow rate is 300m3/h, and the maximum lift is 115m. It is suitable for high-temperature liquids such as heating medium oil and hot water. | Lan Pump Technology Forum# h9 D0 h u6 X3 G$ @ (4)高融点型# y! g( ?2 O! w’@, O3 q( nPump Valve Technology Forum Pumps and motors are jacketed and can be large Increases the heat resistance of the motor. It is suitable for high melting point liquids with a temperature of up to 250℃. Steam or a certain temperature liquid can be passed into the jacket to prevent high melting point liquids from crystallizing. Pumps, pump forums, heat pump technology, water pumps Installation, mechanical seal, cfd software, desulfurization, nuclear pump, pump technology, fluid mechanics, steam turbine principle, dynamic balance calculation, water pump parameters, water pump forum, pumplinx6 S x* |5 X& o( ]: E/ ~ (5) High pressure Type$ }4 p0 U2 ~6 q3 jpumpvip.com The shell of the high-pressure canned motor pump is a high-pressure vessel, which enables the pump to withstand high system pressure. In order to support the shielding sleeve under internal high pressure, the stator coil can be used to withstand Pressure. pumpvip.com; F. K8 p: j/ k/ L (6) Self-priming pump valve technology forum 9 o- q” ]$ `) y8 q’q: x6 When the suction pipe is not full of liquid, the pump passes Automatic pumping and liquid drainage, suitable for extracting liquid from underground containers. (x7 |2 l; u” n4 s/ F*} (7) Multi-stage 2 f8 v+ K1 e+ W* F Pump Valve Technology Forum Installation There are multiple impellers, suitable for high-lift fluid transportation, the highest head can reach 400m.’ D! u/ D6 t) w+ W1 u0 S4 F pump, pump forum, heat pump technology, water pump installation, mechanical seal, cfd software, desulfurization, nuclear Pumps, pump technology, fluid mechanics, steam turbine principles, dynamic balance calculations, pump parameters, pump forums, pumplinx (8) Mud type | Blue pump technology forum 0 D I v, x) l* Z! @9 l Suitable for transportation and mixing A large amount of muddy liquid.’ E0 x3 b” o$ W5 w, d. P 4　Notes when selecting canned motor pumps* p+ o0 M$ I% z! U/ M General canned motor pumps use part of the liquid to cool Motor, and the annular gap is small, so the liquid must be clean. For transporting a variety of liquid mixtures, if they produce precipitation, coking or jelly, the use of shielded pump (non-slurry type) at this time may block the shielding gap and affect the pump The cooling and lubrication of the pump will cause the graphite bearing and the motor to burn out. 0 z” ^” c; k. Z: P4 R# pPump Valve Technology Forum Canned motor pumps generally have circulating cooling pipes. When the ambient temperature is lower than the pumped liquid When it is freezing, it is advisable to adopt anti-freezing measures such as accompanying pipes to ensure that the pump is easy to start.-G( L/ V% H/ V+] In addition, the canned motor pump should strictly abide by the outlet valve and For the opening sequence of the inlet valve, first close the outlet valve when stopping the pump. When the pump stops, first close the inlet valve and then the outlet valve. 2 h4 O: l0 G( n0 S Pump Valve Technology Forum In short, the use of canned motor pumps is completely leak-free and effectively avoids environmental pollution and material loss. As long as the model is selected correctly and there is no abnormal change in operating conditions, under normal operating conditions, There is almost no maintenance workload. The canned motor pump is an ideal pump for conveying flammable, explosive, corrosive, and precious liquids.