CN104454560A - Efficient LNG immersed pump - Google Patents
Efficient LNG immersed pump Download PDFInfo
- Publication number
- CN104454560A CN104454560A CN201410578075.8A CN201410578075A CN104454560A CN 104454560 A CN104454560 A CN 104454560A CN 201410578075 A CN201410578075 A CN 201410578075A CN 104454560 A CN104454560 A CN 104454560A
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- China
- Prior art keywords
- impeller
- liquid
- pump
- immersed pump
- diversion disk
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
- F04D13/08—Units comprising pumps and their driving means the pump being electrically driven for submerged use
- F04D13/086—Units comprising pumps and their driving means the pump being electrically driven for submerged use the pump and drive motor are both submerged
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/18—Rotors
- F04D29/22—Rotors specially for centrifugal pumps
- F04D29/2205—Conventional flow pattern
- F04D29/2222—Construction and assembly
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/18—Rotors
- F04D29/22—Rotors specially for centrifugal pumps
- F04D29/24—Vanes
- F04D29/242—Geometry, shape
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/426—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/44—Fluid-guiding means, e.g. diffusers
- F04D29/445—Fluid-guiding means, e.g. diffusers especially adapted for liquid pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/58—Cooling; Heating; Diminishing heat transfer
- F04D29/5806—Cooling the drive system
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/669—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for liquid pumps
Abstract
The invention discloses an efficient LNG immersed pump. A primary guide disc can collect liquid well and effectively convert kinetic energy to pressure energy. Energy loss is small when the direction of the liquid is changed, the hydraulic loss of the liquid is reduced, impact of liquid flow on a flow channel is lowered, loss of energy is reduced, and therefore the immersed pump gains higher efficiency. A vane wheel enables the liquid to smoothly flow out of liquid outlet channels and join at a liquid outlet, the resistance of liquid flowing is reduced, loss of the liquid energy is reduced, the smoothness of the liquid flowing in the pump is improved, the liquid enters a guiding wheel without turning, dynamic pressure drop is small, cavitation is not prone to occurring, lift generated by the guiding wheel pressurizes the vane wheel, the overall lift of the LNG immersed pump is increased, and the overall performance of the LNG immersed pump is improved. The efficient LNG immersed pump is simple in structure, large in working flow and high in working efficiency, the flow of LNG is effectively increased, the efficient LNG immersed pump is suitable for various working environments, and the unbalance amount is controlled within 2 g.
Description
Technical field
The invention belongs to technical field of LNG, particularly relate to a kind of high efficiency LNG immersed pump.
Background technique
LNG is the abbreviation of LNG Liquefied natural gas (liquefiednaturalgas).Main component is methane.Colourless, tasteless, the nontoxic and non-corrosiveness of LNG, its volume is about with amount gaseous natural gas volume 1/600.Therefore LNG Liquefied natural gas is the effective means of natural gas storing and transport, obtains this year and develops rapidly.
LNG immersed pump be a kind of by Pump and Electromotor integral installation in sealed metal container, zero leakage can be accomplished, avoid producing explosive atmosphere, the current independent development of core drive output unit eliminating the transportation of liquefied natural gas of ignition condition and associated low temperature liquid needs the key issue solved to comprise: LNG immersed pump electrical equipment is studied, the mainly research of low temp. electric insulating material and cryocable, the Seal Technology Study of electrical connection place, the lubrication technical research of latent liquid type motor and motor low-temperature working characteristic several respects; The LNG immersed pump pump housing is studied, mainly LNG cavitation law study in pump, and low temperature immersed pump impeller and inducer structural design are in optimizing and the research of LNG immersed pump self-balancing mechanism.
Due to low temperature and the inflammable characteristic of LNG, transfer pump not only wants to bear the performance of low temperature, and requires higher to the tightness of pump and electrical safety performance.In addition, in motor lubrication and cooling in low temperature LNG, the pump housing, contingent LNG gasification, rotor and pump housing impeller are jointly by the balance problem etc. that the same axis brings, become the key property that LNG immersed pump is different from the general pump housing, addressing these problems is the key point developing LNG immersed pump.
Along with the high speed development of LNG technology, higher to the functional requirement of LNG liquid addition equipment, therefore determine the characteristic of the necessary constantly consummating function of LNG liquid addition equipment, existing LNG low temperature immersion type immersed pump, inflow and the outflow of liquid are all restricted, and make the power of pump on the low side.
Summary of the invention
The invention provides a kind of high efficiency LNG immersed pump, be intended to solve existing LNG low temperature immersion type immersed pump, the inflow of liquid and flowing out all is restricted, the problem that the power of immersed pump is on the low side.
The object of the present invention is to provide a kind of high efficiency LNG immersed pump, this high efficiency LNG immersed pump comprises the pump housing, the rear end of the described pump housing is connected with motor upper cover, side wall channels is provided with in the sidewall of the described pump housing, described side wall channels is by back cavity and flow liquid channel connection, the stator cooperatively interacted and rotor shaft is provided with in the described pump housing, described rotor shaft stretches in the active chamber of pump housing front end, one-level diversion disk is provided with in described active chamber, described active chamber is divided into ante-chamber and back cavity by described one-level diversion disk, ante-chamber is communicated with back cavity by the runner that described one-level diversion disk is arranged, wherein be respectively equipped with the impeller be placed on rotor shaft in ante-chamber and back cavity, described ante-chamber is provided with liquid entering hole, described liquid entering hole place is provided with the inducer be placed on rotor shaft, described one-level diversion disk comprises discoidal diversion disk body, described diversion disk body edge is evenly equipped with some spiral yarn shaped runners, the spirality direction of all runners is identical, and described runner is arranged in diversion disk body edge and is communicated with diversion disk body both sides, described impeller comprises impeller body and some blades, described some blades are located in impeller body, and be uniformly distributed in around impeller body center, described blade extends into vortex-like line structure from the middle part of impeller body to edge, any two adjacent blades are made to form impeller outlet at the edge place of impeller body, the impeller inlet being communicated with impeller outlet is provided with in the middle part of the sidewall of described impeller body, the angle of a=20 °-30 ° is formed between the outermost circle tangent line of wherein said blade and the cylindrical tangent line of impeller body, described inducer comprises the inducer body of drum-shaped, the outer wall of described inducer body is evenly equipped with several helical blades, described helical blade is arranged from head to the helical mode of afterbody, the limit of described guide wheel body afterbody is provided with breach, described inducer is stuck on rotor shaft by breach, described stator is formed by some stator iron core overlaps being provided with radiating groove, radiating groove alignment on all stator iron cores makes to form circulation canal in stator, the sidewall of the described pump housing offers through hole, described through hole forms circulating cooling path in the position at the two ends of stator and circulation canal.
Further, described runner is six, is distributed in the circumferentially same of diversion disk body edge.
Further, described runner is helical structure, and the square of to be the length of side be in the cross section of described runner 13mm, described diversion disk body adopts stainless steel material to make.
Further, described flow liquid passage is four, around the center line being distributed in motor upper cover; Described flow liquid passage relative to the centerline dip angle a=25 ° of motor upper cover, and is intersected in liquid outlet.
Further, described motor covers the liquid pass hole being communicated with pump body and liquid outlet, the diameter of described liquid pass hole is 3mm.
Further, liquid entering hole is aimed in the import being positioned at ante-chamber impeller, and the outlet being positioned at ante-chamber impeller is relative with the import of the runner that described one-level diversion disk is arranged; The outlet of the runner that described one-level diversion disk is arranged is aimed in the import being positioned at back cavity impeller, and the outlet being positioned at back cavity impeller is relative with side wall channels.
Further, the angle a=22 ° between the outermost circle tangent line of described blade and the cylindrical tangent line of impeller body, the width of described impeller outlet is 5.5mm.
Further, described helical blade is three, and all extends to afterbody from the head of inducer body.
Further, the pump housing, liquid entering hole, inducer, impeller, liquid outlet, motor upper cover all adopt stainless steel material to make.
Further, each stator iron core is evenly equipped with 6 radiating grooves, it is circumferentially same that described radiating groove is periphery in stator iron core, described through hole is 8, be distributed on the wall of the pump housing with being divided into two rows, the diameter of described through hole is 20mm, and be provided with side wall channels in the sidewall of the described pump housing, described side wall channels and through hole stagger mutually.
LNG immersed pump provided by the invention, one-level diversion disk can collect liquid well, effectively convert kinetic energy to pressure energy, when liquid rotating is changed direction, energy loss is little, decrease liquid hydraulic loss, reduce the impact of liquid stream to runner, decrease the loss of energy, thus immersed pump obtains higher efficiency, impeller makes liquid be intersected in liquid outlet from fluid runner very smoothly, reduce the resistance of flow of fluid, reduce the loss of liquid energy, improve the flatness of liquid in pump internal flow, liquid from when entering inducer without turning, dynamic pressure is fallen less, thus not easily there is cavitation, the lift that inducer produces is then to impeller supercharging, add the lift of LNG immersed pump entirety, improve the overall performance of LNG immersed pump, this LNG immersed pump structure is simple, working flow is large, working efficiency is high, effectively increase the flow of LNG, be applicable to various working environments, and control within amount of unbalance reaches 2g, there is stronger propagation and employment be worth.
Accompanying drawing explanation
Fig. 1 is the structural representation of the LNG immersed pump that the embodiment of the present invention provides;
Fig. 2 is the structural representation of one-level diversion disk in the LNG immersed pump that provides of the embodiment of the present invention;
Fig. 3 is the plan view of one-level diversion disk in the LNG immersed pump that provides of the embodiment of the present invention;
Fig. 4 is the side view of Fig. 3;
Fig. 5 is the rear view of Fig. 3;
Fig. 6 is the structural representation of impeller in the LNG immersed pump that provides of the embodiment of the present invention;
Fig. 7 is the cut-away view of impeller in the LNG immersed pump that provides of the embodiment of the present invention;
Fig. 8 is the structural representation of inducer in the LNG immersed pump that provides of the embodiment of the present invention;
Fig. 9 is the external structure schematic diagram of the LNG immersed pump that the embodiment of the present invention provides;
Figure 10 is the structural representation of the stator iron core that the embodiment of the present invention provides.
In figure: 1, liquid entering hole; 2, inducer; 2-1, inducer body; 2-2, breach; 2-3, helical blade; 3, impeller; 3-1, impeller body; 3-2, blade; 3-3, impeller outlet; 4, one-level diversion disk; 4-1, flow channel entry point; 4-2, runner exit; 4-3, runner; 5, rotor shaft; 6, stator; 7, side wall channels; 8, flow liquid passage; 9, liquid outlet; 10, through hole; 11, the pump housing; 12, radiating groove.
Embodiment
In order to make object of the present invention, technological scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is described in further detail.Should be appreciated that specific embodiment described herein only in order to explain the present invention, and be not used in restriction invention.
Fig. 1 shows the structure of the high efficiency LNG immersed pump that the embodiment of the present invention provides.For convenience of explanation, illustrate only part related to the present invention.
This high efficiency LNG immersed pump comprises the pump housing, the rear end of the pump housing is connected with motor upper cover, side wall channels 7 is provided with in the sidewall of the pump housing, back cavity is communicated with flow liquid passage 8 by side wall channels 7, the stator 6 and rotor shaft 5 that cooperatively interact is provided with in the pump housing, rotor shaft 5 stretches in the active chamber of pump housing front end, one-level diversion disk 4 is provided with in active chamber, active chamber is divided into ante-chamber and back cavity by one-level diversion disk 4, ante-chamber is communicated with back cavity by the runner 4-3 that one-level diversion disk 4 is arranged, wherein be respectively equipped with the impeller 3 be placed on rotor shaft 5 in ante-chamber and back cavity, ante-chamber is provided with liquid entering hole 1, liquid entering hole 1 place is provided with the inducer 2 be placed on rotor shaft 5, one-level diversion disk 4 comprises discoidal diversion disk body, diversion disk body edge is evenly equipped with some spiral yarn shaped runner 4-3, the spirality direction of all runner 4-3 is identical, and runner 4-3 is arranged in diversion disk body edge and is communicated with diversion disk body both sides, impeller 3 comprises impeller body 3-1 and some blade 3-2, some blade 3-2 are located in impeller body 3-1, and be uniformly distributed in around impeller body 3-1 center, blade 3-2 extends into vortex-like line structure from the middle part of impeller body 3-1 to edge, any two adjacent blade 3-2 are made to form impeller outlet 3-3 at the edge place of impeller body 3-1, impeller 3 import being communicated with impeller outlet 3-3 is provided with in the middle part of the sidewall of impeller body 3-1, the angle of a=20 °-30 ° is formed between the outermost circle tangent line of its Leaf 3-2 and the cylindrical tangent line of impeller body 3-1, inducer 2 comprises the inducer body 2-1 of drum-shaped, the outer wall of inducer body 2-1 is evenly equipped with several helical blades 2-3, helical blade 2-3 arranges from head to the helical mode of afterbody, the limit of guide wheel body afterbody is provided with breach 2-2, inducer 2 is stuck on rotor shaft 5 by breach 2-2, described stator 6 is formed by some stator iron core overlaps being provided with radiating groove 12, radiating groove 12 alignment on all stator iron cores makes to form circulation canal in stator 6, the sidewall of the described pump housing 11 offers through hole 10, described through hole 10 forms circulating cooling path in the position at the two ends of stator 6 and circulation canal.
In embodiments of the present invention, runner 4-3 is six, is distributed in the circumferentially same of diversion disk body edge.
In embodiments of the present invention, runner 4-3 is helical structure, and the square of to be the length of side be in the cross section of runner 4-3 13mm, diversion disk body adopts stainless steel material to make.
In embodiments of the present invention, flow liquid passage 8 is four, around the center line being distributed in motor upper cover; Flow liquid passage 8 relative to the centerline dip angle a=25 ° of motor upper cover, and is intersected in liquid outlet 9.
In embodiments of the present invention, motor covers the liquid pass hole being communicated with pump body and liquid outlet 9, the diameter of liquid pass hole is 3mm.
In embodiments of the present invention, liquid entering hole 1 is aimed in the import being positioned at ante-chamber impeller 3, and the outlet being positioned at ante-chamber impeller 3 is relative with the import of the runner 4-3 that one-level diversion disk 4 is arranged; Be positioned at the import of back cavity impeller 3 to the outlet of the runner 4-3 that pseudo-first-order diversion disk 4 is arranged, the outlet being positioned at back cavity impeller 3 is relative with side wall channels 7.
In embodiments of the present invention, the width of the angle a=22 ° between the outermost circle tangent line of blade 3-2 and the cylindrical tangent line of impeller body 3-1, impeller outlet 3-3 is 5.5mm.
In embodiments of the present invention, helical blade 2-3 is three, and all extends to afterbody from the head of inducer body 2-1.
In embodiments of the present invention, the pump housing, liquid entering hole 1, inducer 2, impeller 3, liquid outlet 9, motor upper cover all adopt stainless steel material to make.
In embodiments of the present invention, each stator iron core is evenly equipped with 6 radiating grooves 12, it is circumferentially same that described radiating groove 12 is periphery in stator iron core, described through hole 10 is 8, be distributed in being divided into two rows on the wall of the pump housing 11, the diameter of described through hole 10 is 20mm, is provided with side wall channels 7 in the sidewall of the described pump housing 11, and described side wall channels 7 staggers mutually with through hole 10.
Below in conjunction with drawings and the specific embodiments, application principle of the present invention is further described.
As shown in Fig. 2, Fig. 3, Fig. 4, Fig. 5, the one-level diversion disk 4 of LNG immersed pump provided by the invention, comprise discoidal diversion disk body, diversion disk body edge is evenly equipped with some spiral yarn shaped runner 4-3, the spirality direction of all runner 4-3 is identical, and runner 4-3 is arranged in diversion disk body edge and is communicated with diversion disk body both sides.
Owing to have employed said structure, the runner 4-3 of one-level diversion disk 4 designs with the pattern of helix, well can collect liquid, well can convert kinetic energy to pressure energy, when liquid rotating is changed direction, energy loss is little, the suction port of the inflow sencond stage impeller 3 that the liquid that its one stage impeller 3 is thrown away is very level and smooth, greatly reducing liquid hydraulic loss, reduce the impact of liquid stream to runner 4-3, decrease the loss of energy, thus pump obtains higher efficiency.
The one-level diversion disk 4 of LNG immersed pump provided by the invention, runner 4-3 is six, is distributed in the circumferentially same of diversion disk body edge.
Owing to have employed said structure, runner 4-3 is too much, then the liquid that passes through in each runner 4-3 can be made very few, thus increase the resistance of fluid, can increase the impact of liquid stream to runner 4-3, the loss of energization; And runner 4-3 is very few, the volume of whole one-level diversion disk 4 then can be made to increase, thus the volume of whole LNG immersed pump is increased, can not be used in some position, greatly reduce its using scope, this LNG immersed pump will coordinate the collocation of ante-chamber and back cavity impeller 3 to use simultaneously, therefore 6 runner 4-3 are preferably, under the prerequisite not increasing one-level diversion disk 4 volume, decrease liquid hydraulic loss, reduce the impact of liquid stream to runner 4-3, decrease the loss of energy, thus pump obtains higher efficiency.
The one-level diversion disk 4 of LNG immersed pump provided by the invention, runner 4-3 is helical structure, and the square of to be the length of side be in its runner 4-3 cross section 13mm, diversion disk body adopts stainless steel material to make.
Owing to have employed said structure, runner 4-3 cross section is the square of length of side 13mm, considerably increases liquid area of passage like this, thus the flow of pump is increased; One-level diversion disk 4 adopts stainless steel (OCr18Ni9) material to make, and stainless steel material has rust inhibition, and shrinks little in LNG and evenly, the advantages such as stable mechanical property, the life-span is permanent.
LNG immersed pump provided by the invention, comprise the pump housing, the rear end of the pump housing is connected with motor upper cover, side wall channels 7 is provided with in the sidewall of the pump housing, back cavity is communicated with flow liquid passage 8 by side wall channels 7, the stator 6 and rotor shaft 5 that cooperatively interact is provided with in the pump housing, rotor shaft 5 stretches in the active chamber of pump housing front end, be provided with one-level diversion disk 4 in active chamber and be divided into ante-chamber and back cavity, ante-chamber is communicated with back cavity by the runner 4-3 that one-level diversion disk 4 is arranged, wherein be respectively equipped with the impeller 3 be placed on rotor shaft 5 in ante-chamber and back cavity, ante-chamber is provided with liquid entering hole 1, liquid entering hole 1 place is provided with the inducer 2 be placed on rotor shaft 5.
Owing to have employed said structure, stator 6 coil winding can be rotated by rotor driven axle 5, for whole immersed pump provides power source, rotor shaft 5 impeller 3 and inducer 2 rotate simultaneously, thus can LNG be drawn into immersed pump from liquid entering hole 1, first being induced wheel 2 is drawn in ante-chamber, first time supercharging can be realized by impeller 3 through rotating, LNG after supercharging can enter into back cavity from the runner 4-3 hole one-level diversion disk 4, second time supercharging is carried out again by the impeller 3 in back cavity, the LNG in back cavity is made to have higher pressure, hydrodynamic pressure after immersed pump is increased, back cavity and side wall channels 7 are communicated to flow liquid passage 8, and flow liquid passage 8 is pooled to same liquid outlet 9 and LNG can be discharged from liquid outlet 9.
LNG immersed pump provided by the invention, flow liquid passage 8 is four, around the center line being distributed in motor upper cover; Flow liquid passage 8 relative to the centerline dip angle a=25 ° of motor upper cover, and is intersected in liquid outlet 9.
Owing to have employed said structure, liquid fluid runner 4-3 quantity is 4, increases the effect of liquid overcurrent; The inclination of fluid pipe is designed to 25 °, will greatly improve the flatness of liquid in pump internal flow.
LNG immersed pump provided by the invention, the pump housing, liquid entering hole 1, inducer 2, impeller 3, motor upper cover and liquid outlet 9 all adopt stainless steel material to make.
Owing to have employed said structure, make the parts in whole LNG immersed pump all adopt stainless steel material to make, stainless steel material has rust inhibition, and shrinks evenly in LNG, and the advantages such as stable mechanical property, the life-span is permanent.
As shown in Figure 6, Figure 7, the impeller 3 of LNG immersed pump provided by the invention, comprise impeller body 3-1 and some blade 3-2, some blade 3-2 are located in impeller body 3-1, and be uniformly distributed in around impeller body 3-1 center, blade 3-2 extends into vortex-like line structure from the middle part of impeller body 3-1 to edge, makes any two adjacent blade 3-2 form impeller outlet 3-3 at the edge place of impeller body 3-1, is provided with impeller 3 import being communicated with impeller outlet 3-3 in the middle part of the sidewall of impeller body 3-1; The angle of a=20 °-30 ° is formed between the outermost circle tangent line of its Leaf 3-2 and the cylindrical tangent line of impeller body 3-1.
Owing to have employed said structure, two adjacent blade 3-2 and impeller body 3-1 form impeller 3 runner 4-3, its entrance is impeller 3 import in the middle part of impeller body 3-1, its outlet is the impeller outlet 3-3 being positioned at impeller body 3-1 edge, therefore, when impeller body 3-1 rotates, fluid can be made to enter into the impeller 3 runner 4-3 of impeller 3 from impeller 3 import, given centrifugal force by the impeller 3 rotated, flow out from impeller outlet 3-3 again, thus realize the centrifugal conveying of LNG; Its Leaf 3-2 is uniformly distributed in around impeller body 3-1 center, blade 3-2 extends into arcuate structure (particularly vortex-like line structure) from the middle part of impeller body 3-1 to edge, thus impeller body 3-1 can rotate reposefully, thus guarantee that the supply of impeller 3 convection cell is steady, fluid in final control impeller 3 after impeller 3, its supply amount of unbalance reach 2g within.The line stretcher of the blade 3-2 in the present invention and the cylindrical tangent line of impeller body 3-1 form the angle of a=20 °-30 °, and the laying angle that also namely blade 3-2 exports is designed between 20 °-30 °, thus the efficiency of pump is improved greatly, from the working flow that improve pump.
The impeller 3 of LNG immersed pump provided by the invention, the width of the angle a=22 ° between the outermost circle tangent line of blade 3-2 and the cylindrical tangent line of impeller body 3-1, impeller outlet 3-3 is 5.5mm.
Owing to have employed said structure, impeller outlet 3-3 width design is 5.5mm, increases the area of passage of liquid, makes it flow and is increased; The line stretcher of blade 3-2 and the cylindrical tangent line of impeller body 3-1 form the angle of a=22 ° simultaneously, and the laying angle that also namely blade 3-2 exports is designed to 22 degree, and the efficiency of pump is improved greatly.
The impeller 3 of LNG immersed pump provided by the invention, impeller body 3-1 and some blade 3-2 all adopts stainless steel material to make.
Owing to have employed said structure, stainless steel material has rust inhibition, and shrinks evenly in LNG, and the advantages such as stable mechanical property, the life-span is permanent.
LNG immersed pump provided by the invention, comprises the pump housing, is provided with side wall channels 7 in the sidewall of the pump housing, and the rear end of the pump housing is connected with motor upper cover, motor covers the flow liquid passage 8 being provided with and being communicated with side wall channels 7; The stator 6 and rotor shaft 5 that cooperatively interact is provided with in the pump housing, rotor shaft 5 stretches in the active chamber of pump housing front end, be provided with one-level diversion disk 4 in active chamber and be divided into ante-chamber and back cavity, one-level diversion disk 4 is provided with the runner 4-3 being communicated with ante-chamber and back cavity, ante-chamber is provided with liquid entering hole 1, be provided with the inducer 2 be placed on rotor shaft 5 in liquid entering hole 1, be wherein equipped with impeller 3 in ante-chamber and back cavity; Be positioned at the impeller 3 of ante-chamber, liquid entering hole 1 is aimed in its impeller 3 import, and its impeller outlet 3-3 is relative with the import of runner 4-3; Be positioned at the impeller 3 of back cavity, the outlet of runner 4-3 is aimed in its impeller 3 import, and its impeller outlet 3-3 is relative with side wall channels 7.
Owing to have employed said structure, coil winding can be rotated by rotor driven axle 5, for whole centrifugal pump provides power source, rotor shaft 5 impeller 3 and helical rotation simultaneously, thus can LNG be drawn into centrifugal pump from liquid entering hole 1, first be drawn in ante-chamber by spiral, first time supercharging can be realized by impeller 3 through rotating, LNG after supercharging can enter into back cavity from the runner 4-3 one-level diversion disk 4, second time supercharging is carried out again by the impeller 3 in back cavity, make the LNG in back cavity have higher pressure, the hydrodynamic pressure after centrifugal pump is increased; Back cavity and side wall channels 7 are communicated to liquid outlet 9, LNG can be discharged from liquid outlet 9.LNG immersed pump provided by the invention, structure is simple, and working flow is large, can increase work efficiency, and increases the flow of LNG, is applicable to various working environments, within control amount of unbalance reaches 2g.
LNG immersed pump provided by the invention, flow liquid passage 8 is four, and around the center line being distributed in motor upper cover, flow liquid passage 8 is relative to the centerline dip angle a=25 ° of upper cover body, and flow liquid passage 8 is intersected in liquid outlet 9.
Owing to have employed said structure, the quantity of flow liquid passage 8 is 4, increases the effect of liquid overcurrent; The inclination of fluid pipe is designed to 25 °, will greatly improve the flatness of liquid in pump internal flow.
LNG immersed pump provided by the invention, motor covers the liquid pass hole being communicated with pump body and liquid outlet 9, the diameter of liquid pass hole is 3mm.
Owing to have employed said structure, liquid pass hole object is to allow a little liquid by hole for back flow, the bearing in lubrication and cooling LNG immersed pump, can also clear up inner impurity.Because LNG immersed pump is when high-frequency operation, bearing is at High Rotation Speed, the heat produced is also quite large, so the cooling of liquid must must be had, by the design of hole for back flow, bearing is cooled and lubricates, substantially increase the working life of bearing, bearing is also the easily damaged parts inside pump component, and the life-span of easily damaged parts improves, therefore the life-span of pump also increases accordingly.Meanwhile, how much work that pump is accumulating over a long period, also can accumulate inside bearing rear chamber
As shown in Figure 8, the inducer 2 of LNG immersed pump provided by the invention, comprise the inducer body 2-1 of drum-shaped, the outer wall of inducer body 2-1 is evenly equipped with several helical blades 2-3, helical blade 2-3 arranges from head to the helical mode of afterbody, and the limit of guide wheel body afterbody is provided with breach 2-2.
Owing to have employed said structure, inducer 2 is between liquid entering hole 1 and ante-chamber impeller 3, and inducer 2 afterbody is fastened by screws at rotatingshaft end by this breach 2-2, and can together with rotatingshaft high speed rotating.When inducer 2 works together with impeller 3, the lift that inducer 2 produces, then to impeller 3 supercharging, increases to some extent to the lift of pump entirety; The anti-cavitation performance of inducer 2 is high because liquid when entering inducer 2 without turning, dynamic pressure is fallen less, thus not easily cavitation occurs; The performance of pump entirety is all increased.
The inducer 2 of LNG immersed pump provided by the invention, helical blade 2-3 is three, and all extends to afterbody from the head of inducer body 2-1.
Owing to adopting said structure, helical blade 2-3 is too much, then the pressure importing fluid is excessive, thus has influence on the rotation of impeller 3 in ante-chamber, plays interference effect; And helical blade 2-3 is very few, then the hydrodynamic pressure imported is not enough, cannot play the effect of supercharging, only have when helical blade 2-3 is chosen as three, while guarantee has enough pressurizations, can not have influence on again the rotation supercharging of impeller 3.
The inducer 2 of LNG immersed pump provided by the invention, inducer body 2-1 and helical blade 2-3 all adopts stainless steel material to make.
Stainless steel material has rust inhibition, and shrinks evenly in LNG, and the advantages such as stable mechanical property, make inducer 2 life-span permanent.
LNG immersed pump provided by the invention, comprises the pump housing, is provided with side wall channels 7 in the sidewall of the pump housing, and the rear end of the pump housing is connected with motor upper cover, motor covers the flow liquid passage 8 being provided with and being communicated with side wall channels 7; The stator 6 and rotor shaft 5 that cooperatively interact is provided with in the pump housing, rotor shaft 5 stretches in the active chamber of pump housing front end, be provided with one-level diversion disk 4 in active chamber and be divided into ante-chamber and back cavity, one-level diversion disk 4 is provided with the runner 4-3 being communicated with ante-chamber and back cavity, wherein be equipped with impeller 3 in ante-chamber and back cavity, back cavity is communicated with flow liquid passage 8, and ante-chamber is provided with liquid entering hole 1; It is characterized in that: be provided with the inducer 2 be placed on rotor shaft 5 in liquid entering hole 1, inducer 2 is stuck on rotor shaft 5 by breach 2-2, is wherein positioned at the impeller 3 of ante-chamber, and liquid entering hole 1 is aimed in its impeller 3 import.
Owing to have employed said structure, coil winding can be rotated by rotor driven axle 5, for whole centrifugal pump provides power source, rotor shaft 5 impeller 3 and helical rotation simultaneously, thus can LNG be drawn into centrifugal pump from liquid entering hole 1, when inducer 2 works together with impeller 3, the lift that inducer 2 produces is then to impeller 3 supercharging, the lift of pump entirety is increased to some extent, therefore liquid enters after in centrifugal pump, be drawn in ante-chamber through inducer 2, inducer 2 anti-cavitation performance is high, because liquid when entering inducer 2 without turning, dynamic pressure is fallen less, thus not easily there is cavitation, the performance of pump entirety is all increased, first time supercharging can be realized by impeller 3 through rotating in ante-chamber, LNG after supercharging can enter into back cavity from the runner 4-3 one-level diversion disk 4, second time supercharging is carried out again by the impeller 3 in back cavity, make the LNG in back cavity have higher pressure, the hydrodynamic pressure after centrifugal pump is increased, back cavity and side wall channels 7 are communicated to liquid outlet 9, LNG can be discharged from liquid outlet 9.
LNG immersed pump provided by the invention, structure is simple, and working flow is large, can increase work efficiency, and increases the flow of LNG, is applicable to various working environments.
LNG immersed pump provided by the invention, flow liquid passage 8 is four, around the center line being distributed in motor upper cover; Flow liquid passage 8 is relative to the centerline dip angle a=25 ° of upper cover body, and flow liquid passage 8 is intersected in liquid outlet 9.
Owing to have employed said structure, the quantity of flow liquid passage 8 is 4, increases the effect of liquid overcurrent; The inclination of fluid pipe is designed to 25 °, and by greatly improving the flatness of liquid in pump internal flow, decrease the resistance of fluid, liquid is without turning, and dynamic pressure is fallen less, all increases to the performance of pump entirety.
LNG immersed pump provided by the invention, liquid entering hole 1, active chamber, impeller 3, one-level diversion disk 4 and motor upper cover all adopt stainless steel material to make.
Owing to have employed said structure, make the parts in whole LNG immersed pump all adopt stainless steel material to make, stainless steel material has rust inhibition, and shrinks evenly in LNG, and the advantages such as stable mechanical property, the life-span is permanent.
The LNG immersed pump being provided with motor radiating loop structure of the present invention, comprise the pump housing 11, the rotor shaft 5 and stator 6 that cooperatively interact is provided with in the pump housing 11, stator 6 is formed by some staor winding overlaps being provided with radiating groove 12, radiating groove 12 alignment on all staor winding makes to form circulation canal in stator 6, the sidewall of the pump housing 11 offers through hole 10, through hole 10 forms circulating cooling path in the position at the two ends of stator 6 and circulation canal.
Owing to have employed said structure, when the operation of LNG immersed pump, staor winding, rotor iron core, winding all can produce heat, owing to being be immersed in cryogenic liquide (LNG liquid) during this pump work, therefore cryogenic liquide can enter inside from the through hole 10 of the pump housing 11 upper surface, cooling iron core and winding etc., LNG liquid is also by circulating in the circulation canal on stator 6, take away the heat produced in the middle part of staor winding, remain that the temperature of motor part can not raise, thus the life-span of motor extends greatly, wherein through hole 10 forms circulating cooling path in the position at the two ends of stator 6 and circulation canal, substantially increase its cooling effect, make its heat dispersion better.
The LNG immersed pump being provided with motor radiating loop structure of the present invention, each staor winding is evenly equipped with 6 radiating grooves 12, and it is circumferentially same that radiating groove 12 is periphery in staor winding.
Owing to have employed said structure, radiating groove 12 1 aspect can alleviate the weight of staor winding, be convenient to the liquid entered in the pump housing 11 on the other hand pass through, thus the heat taken away in the pump housing 11, and make cryogenic liquide at the pump housing 11 inside and outside formation cool cycles passage, make immersed pump have preferably radiating effect.
The LNG immersed pump being provided with motor radiating loop structure of the present invention, through hole 10 is 8, is distributed in being divided into two rows on the wall of the pump housing 11, and the diameter of through hole 10 is 20mm.
Owing to have employed said structure, by arranging number and the diameter of through hole 10, thus the fluid flow entered in the pump housing 11 can be limited, if through hole 10 is too much, aperture is larger, the fluid flow then entered in the pump housing 11 is excessive, then can have influence on relatively rotating between rotor and stator 6, thus affects its power; If through hole 10 is too small, aperture is less, then the fluid flow entered in the pump housing 11 is less, then can have a strong impact on the cooling effect of this pump housing 11 inside.
The LNG immersed pump being provided with motor radiating loop structure of the present invention, is provided with side wall channels 7 in the sidewall of the pump housing 11, side wall channels 7 and through hole 10 stagger mutually.
Owing to have employed said structure, side wall channels 7 and through hole 10 stagger mutually, if through hole 10 is arranged on side wall channels 7, then the liquid in side wall channels 7 can be caused to leak, affect the lift of immersed pump.
The LNG immersed pump being provided with motor radiating loop structure of the present invention, the rear end of the pump housing 11 is connected with motor upper cover, motor covers the flow liquid passage 8 being provided with and being communicated with side wall channels 7; Rotor shaft 5 stretches in the active chamber of the pump housing 11 front end, be provided with one-level refluence dish 4 in active chamber and be divided into ante-chamber and back cavity, one-level refluence dish 4 is provided with the liquid runner being excessively communicated with ante-chamber and back cavity, ante-chamber is provided with liquid entering hole 1, be provided with the inducer 2 be placed on rotor shaft 5 in liquid entering hole 1, be wherein equipped with the impeller 3 be placed on rotor shaft 5 in ante-chamber and back cavity.
Owing to have employed said structure, stator 6 coil winding can drive rotatingshaft to rotate, for whole centrifugal pump provides power source, rotatingshaft impeller 3 and inducer 2 rotate simultaneously, thus can LNG be drawn into centrifugal pump from liquid entering hole 1, first being induced wheel 2 is drawn in ante-chamber, first time supercharging can be realized by impeller 3 through rotating, LNG after supercharging can enter into back cavity from the runner hole one-level refluence dish 4, second time supercharging is carried out again by the impeller 3 in back cavity, make the LNG in back cavity have higher pressure, the hydrodynamic pressure after centrifugal pump is increased; Back cavity and side wall channels 7 are communicated to liquid outlet 9, LNG can be discharged from liquid outlet 9.
The LNG immersed pump that the embodiment of the present invention provides, one-level diversion disk 4 can collect liquid well, effectively convert kinetic energy to pressure energy, when liquid rotating is changed direction, energy loss is little, decrease liquid hydraulic loss, reduce the impact of liquid stream to runner 4-3, decrease the loss of energy, thus immersed pump obtains higher efficiency, impeller 3 makes liquid be intersected in liquid outlet 9 from fluid runner 4-3 very smoothly, reduce the resistance of flow of fluid, reduce the loss of liquid energy, improve the flatness of liquid in pump internal flow, liquid from when entering inducer 2 without turning, dynamic pressure is fallen less, thus not easily there is cavitation, the lift that inducer 2 produces is then to impeller 3 supercharging, add the lift of LNG immersed pump entirety, improve the overall performance of LNG immersed pump, this LNG immersed pump structure is simple, working flow is large, working efficiency is high, effectively increase the flow of LNG, be applicable to various working environments, and control within amount of unbalance reaches 2g, there is stronger propagation and employment be worth.
These are only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a high efficiency LNG immersed pump, it is characterized in that, this high efficiency LNG immersed pump comprises the pump housing, the rear end of the described pump housing is connected with motor upper cover, side wall channels is provided with in the sidewall of the described pump housing, described side wall channels is by back cavity and flow liquid channel connection, the stator cooperatively interacted and rotor shaft is provided with in the described pump housing, described rotor shaft stretches in the active chamber of pump housing front end, one-level diversion disk is provided with in described active chamber, described active chamber is divided into ante-chamber and back cavity by described one-level diversion disk, ante-chamber is communicated with back cavity by the runner that described one-level diversion disk is arranged, wherein be respectively equipped with the impeller be placed on rotor shaft in ante-chamber and back cavity, described ante-chamber is provided with liquid entering hole, described liquid entering hole place is provided with the inducer be placed on rotor shaft, described one-level diversion disk comprises discoidal diversion disk body, described diversion disk body edge is evenly equipped with some spiral yarn shaped runners, the spirality direction of all runners is identical, and described runner is arranged in diversion disk body edge and is communicated with diversion disk body both sides, described impeller comprises impeller body and some blades, described some blades are located in impeller body, and be uniformly distributed in around impeller body center, described blade extends into vortex-like line structure from the middle part of impeller body to edge, any two adjacent blades are made to form impeller outlet at the edge place of impeller body, the impeller inlet being communicated with impeller outlet is provided with in the middle part of the sidewall of described impeller body, the angle of a=20 °-30 ° is formed between the outermost circle tangent line of wherein said blade and the cylindrical tangent line of impeller body, described inducer comprises the inducer body of drum-shaped, the outer wall of described inducer body is evenly equipped with several helical blades, described helical blade is arranged from head to the helical mode of afterbody, the limit of described guide wheel body afterbody is provided with breach, described inducer is stuck on rotor shaft by breach, described stator is formed by some stator iron core overlaps being provided with radiating groove, radiating groove alignment on all stator iron cores makes to form circulation canal in stator, the sidewall of the described pump housing offers through hole, described through hole forms circulating cooling path in the position at the two ends of stator and circulation canal.
2. high efficiency LNG immersed pump as claimed in claim 1, it is characterized in that, described runner is six, is distributed in the circumferentially same of diversion disk body edge.
3. high efficiency LNG immersed pump as claimed in claim 1, it is characterized in that, described runner is helical structure, and the square of to be the length of side be in the cross section of described runner 13mm, described diversion disk body adopts stainless steel material to make.
4. high efficiency LNG immersed pump as claimed in claim 1, it is characterized in that, described flow liquid passage is four, around the center line being distributed in motor upper cover; Described flow liquid passage relative to the centerline dip angle a=25 ° of motor upper cover, and is intersected in liquid outlet.
5. high efficiency LNG immersed pump as claimed in claim 1, is characterized in that, described motor covers the liquid pass hole being communicated with pump body and liquid outlet, the diameter of described liquid pass hole is 3mm.
6. high efficiency LNG immersed pump as claimed in claim 1, is characterized in that, liquid entering hole is aimed in the import being positioned at ante-chamber impeller, and the outlet being positioned at ante-chamber impeller is relative with the import of the runner that described one-level diversion disk is arranged; The outlet of the runner that described one-level diversion disk is arranged is aimed in the import being positioned at back cavity impeller, and the outlet being positioned at back cavity impeller is relative with side wall channels.
7. high efficiency LNG immersed pump as claimed in claim 1, it is characterized in that, the angle a=22 ° between the outermost circle tangent line of described blade and the cylindrical tangent line of impeller body, the width of described impeller outlet is 5.5mm.
8. high efficiency LNG immersed pump as claimed in claim 1, it is characterized in that, described helical blade is three, and all extends to afterbody from the head of inducer body.
9. high efficiency LNG immersed pump as claimed in claim 1, it is characterized in that, the described pump housing, liquid entering hole, inducer, impeller, liquid outlet, motor upper cover all adopt stainless steel material to make.
10. high efficiency LNG immersed pump as claimed in claim 1, it is characterized in that, each stator iron core is evenly equipped with 6 radiating grooves, it is circumferentially same that described radiating groove is periphery in stator iron core, described through hole is 8, is distributed on the wall of the pump housing with being divided into two rows, and the diameter of described through hole is 20mm, be provided with side wall channels in the sidewall of the described pump housing, described side wall channels and through hole stagger mutually.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410578075.8A CN104454560A (en) | 2014-10-24 | 2014-10-24 | Efficient LNG immersed pump |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410578075.8A CN104454560A (en) | 2014-10-24 | 2014-10-24 | Efficient LNG immersed pump |
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| CN104454560A true CN104454560A (en) | 2015-03-25 |
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| CN201410578075.8A Pending CN104454560A (en) | 2014-10-24 | 2014-10-24 | Efficient LNG immersed pump |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108361205A (en) * | 2017-07-17 | 2018-08-03 | 华中科技大学 | A kind of centrifugal pump impeller and the LNG immersed pumps comprising the centrifugal pump impeller |
| CN109474122A (en) * | 2018-12-14 | 2019-03-15 | 哈尔滨理工大学 | A kind of latent liquid type LNG pump low-temperature and high-speed motor |
| CN110159548A (en) * | 2019-06-13 | 2019-08-23 | 广东骏驰科技股份有限公司 | A kind of electric centrifugal pump |
| CN112145438A (en) * | 2020-09-30 | 2020-12-29 | 徐国华 | Water pump |
| CN112524042A (en) * | 2020-11-20 | 2021-03-19 | 江苏大学 | Multistage mixed transportation pump for deep sea mining |
| CN113153766A (en) * | 2021-05-26 | 2021-07-23 | 苏州沃达园林机械有限公司 | High-working-performance submersible pump |
| CN116459696A (en) * | 2023-06-07 | 2023-07-21 | 苏州健雄职业技术学院 | Single-shaft-driven powder-liquid two-suction mixing pump and powder mixing and dispersing system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108361205A (en) * | 2017-07-17 | 2018-08-03 | 华中科技大学 | A kind of centrifugal pump impeller and the LNG immersed pumps comprising the centrifugal pump impeller |
| CN108361205B (en) * | 2017-07-17 | 2020-05-19 | 华中科技大学 | Centrifugal pump impeller and LNG immersed pump comprising same |
| CN109474122A (en) * | 2018-12-14 | 2019-03-15 | 哈尔滨理工大学 | A kind of latent liquid type LNG pump low-temperature and high-speed motor |
| CN110159548A (en) * | 2019-06-13 | 2019-08-23 | 广东骏驰科技股份有限公司 | A kind of electric centrifugal pump |
| CN110159548B (en) * | 2019-06-13 | 2024-02-20 | 广东骏驰科技股份有限公司 | Electric centrifugal pump |
| CN112145438A (en) * | 2020-09-30 | 2020-12-29 | 徐国华 | Water pump |
| US11808268B2 (en) | 2020-10-19 | 2023-11-07 | Milwaukee Electric Tool Corporation | Stick pump assembly |
| CN112524042A (en) * | 2020-11-20 | 2021-03-19 | 江苏大学 | Multistage mixed transportation pump for deep sea mining |
| CN112524042B (en) * | 2020-11-20 | 2022-05-20 | 江苏大学 | Multistage mixed transportation pump for deep sea mining |
| CN113153766A (en) * | 2021-05-26 | 2021-07-23 | 苏州沃达园林机械有限公司 | High-working-performance submersible pump |
| CN113153766B (en) * | 2021-05-26 | 2024-01-23 | 苏州沃达园林机械有限公司 | High-working-performance submersible pump |
| CN116459696A (en) * | 2023-06-07 | 2023-07-21 | 苏州健雄职业技术学院 | Single-shaft-driven powder-liquid two-suction mixing pump and powder mixing and dispersing system |
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Application publication date: 20150325 |