CN203685671U - Inducer of LNG (Liquefied Natural Gas) submerged pump and LNG submerged pump - Google Patents
Inducer of LNG (Liquefied Natural Gas) submerged pump and LNG submerged pump Download PDFInfo
- Publication number
- CN203685671U CN203685671U CN201320701604.XU CN201320701604U CN203685671U CN 203685671 U CN203685671 U CN 203685671U CN 201320701604 U CN201320701604 U CN 201320701604U CN 203685671 U CN203685671 U CN 203685671U
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- China
- Prior art keywords
- inducer
- lng
- pump
- chamber
- impeller
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- Expired - Lifetime
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- 239000000411 inducer Substances 0.000 title claims abstract description 69
- 239000003949 liquefied natural gas Substances 0.000 title abstract description 65
- 239000007788 liquid Substances 0.000 claims abstract description 67
- 239000000463 material Substances 0.000 claims description 11
- 229910001220 stainless steel Inorganic materials 0.000 claims description 11
- 239000010935 stainless steel Substances 0.000 claims description 11
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical group C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 6
- 238000011160 research Methods 0.000 description 6
- 239000012530 fluid Substances 0.000 description 5
- 238000011161 development Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000005764 inhibitory process Effects 0.000 description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000009967 tasteless effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Images
Abstract
The utility model discloses an inducer of an LNG (Liquefied Natural Gas) submerged pump and belongs to the technical field of LNG. The inducer of the LNG submerged pump comprises a drum-shaped inducer body, a plurality of helical blades are uniformly distributed on the outer wall of the drum-shaped inducer body; the helical blades are arranged in a helical mode from head to tail, and a gap is formed in the edge of the inducer body. The inducer of the LNG submerged pump and the LNG submerged have the advantages that liquid is not turned when entering into the inducer, and dynamic depression is less, so that cavitation does not occur easily; the impeller pressure is increased by virtue of a lift generated by the inducer, and the integral lift of the pump is increased, so that the integral performance of the pump is improved.
Description
Technical field
The utility model relates to LNG technical field, particularly a kind of LNG immersed pump.
Background technique
LNG is the abbreviation of LNG Liquefied natural gas (liquefied natural gas).Main component is methane.Colourless, tasteless, the nontoxic and non-corrosiveness of LNG, its volume is about with 1/600 of amount gaseous natural gas volume.Therefore LNG Liquefied natural gas is the effective means of natural gas storing and transport, has obtained development rapidly this year.
LNG immersed pump be a kind of by Pump and Electromotor integral installation in sealed metal container, can accomplish zero leakage, avoid producing explosive atmosphere, eliminate the transportation of liquefied natural gas of ignition condition and the core drive output unit of relevant cryogenic liquide, the key issue that independent development need to solve at present comprises: the research of LNG immersed pump electrical equipment is mainly the research of low temp. electric insulating material and cryocable, the Seal Technology Study of electrical connection place, lubrication technical research and motor low-temperature working characteristic several respects of latent liquid type motor; The research of the LNG immersed pump pump housing, is mainly LNG cavitation rule research in pump, and low temperature immersed pump impeller and inducer structural design are in the research of optimization and LNG immersed pump self-balancing mechanism.
Due to the low temperature of LNG and inflammable characteristic, transfer pump is not only wanted the performance that can bear low temperature, and tightness to pump and electrical safety performance require higher.In addition, balance problem that contingent LNG gasification in motor lubrication and cooling in low temperature LNG, the pump housing, rotor and pump housing impeller bring with the same axis jointly etc., become the key property that LNG immersed pump is different from the general pump housing, addressing these problems is the key point of development LNG immersed pump.
Along with the high speed development of LNG technology, functional requirement to LNG liquid feeding equipment is higher, therefore determined the constantly characteristic of consummating function of LNG liquid feeding equipment, existing LNG low temperature immersion type immersed pump, the inflow of liquid and outflow are all restricted, and make the power of pump on the low side.
Model utility content
Goal of the invention of the present utility model is: for the problem of above-mentioned existence, provide a kind of inducer and LNG immersed pump thereof of LNG immersed pump, liquid is without turning when entering inducer, and dynamic pressure is fallen less, thereby is difficult for occurring cavitation; The lift that described inducer produces, to impeller supercharging, increases to some extent to the lift of pump entirety, and the performance of pump entirety is all increased.
The technical solution adopted in the utility model is as follows:
The inducer of LNG immersed pump of the present utility model, comprise the inducer body of drum-shaped, on the outer wall of described inducer body, be evenly equipped with several helical blades, described helical blade arranges to the helical mode of afterbody from the head, and the limit of described guide wheel body afterbody is provided with breach.
Owing to having adopted said structure, described inducer is between liquid entering hole and ante-chamber impeller, and inducer afterbody is fastened by screws at rotatingshaft end by this breach, and can be together with rotatingshaft high speed rotating.In the time that described inducer is worked together with impeller, the lift that inducer produces, to impeller supercharging, increases to some extent to the lift of pump entirety; The anti-cavitation performance of described inducer is high because liquid in the time entering inducer without turning, dynamic pressure is fallen less, thus be difficult for occur cavitation; Performance to pump entirety all increases.
The inducer of LNG immersed pump of the present utility model, described helical blade is three, and all extends to afterbody from the head of inducer body.
Owing to adopting said structure, helical blade is too much, and the pressure that imports fluid is excessive, thereby has influence on the rotation of impeller in ante-chamber, plays interference effect; And helical blade is very few, the hydrodynamic pressure deficiency importing, cannot play the effect of supercharging, only has and is chosen as three when helical blade, when guarantee has enough pressurizations, can not have influence on again the rotation supercharging of impeller.
The inducer of LNG immersed pump of the present utility model, described inducer body and helical blade 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, make the inducer life-span permanent.
LNG immersed pump of the present utility model, comprises the pump housing, is provided with sidewall passage in the sidewall of the described pump housing, and the rear end of the described pump housing is connected with motor upper cover, covers the flow liquid passage being provided with sidewall channel connection on described motor; In the described pump housing, be provided with the stator and the rotor shaft that cooperatively interact, described rotor shaft stretches in the active chamber of pump housing front end, in described active chamber, be provided with collector and be divided into ante-chamber and back cavity, described collector is provided with the liquid runner excessively that is communicated with ante-chamber and back cavity, wherein in ante-chamber and back cavity, be equipped with impeller, described back cavity and flow liquid channel connection, described ante-chamber is provided with liquid entering hole; It is characterized in that: in described liquid entering hole, be provided with the inducer being placed on rotor shaft, described inducer is stuck on rotor shaft by breach, is wherein positioned at the impeller of ante-chamber, its impeller inlet is aimed at liquid entering hole.
Owing to having adopted said structure, coil winding can be rotated by rotor driven axle, for whole centrifugal pump provides power source, rotor shaft impeller and helical rotation simultaneously, thereby LNG can be drawn into centrifugal pump from liquid entering hole, when described inducer is worked together with impeller, the lift that inducer produces is to impeller supercharging, lift to pump entirety increases to some extent, therefore after liquid enters in centrifugal pump, be drawn in ante-chamber through inducer, described inducer anti-cavitation performance is high, because liquid in the time entering inducer without turning, dynamic pressure is fallen less, thereby the difficult cavitation that occurs, performance to pump entirety all increases, in ante-chamber, can realize supercharging for the first time through the impeller rotating, LNG after supercharging can enter into back cavity by the liquid runner of crossing from collector, carried out supercharging for the second time by the impeller in back cavity again, make the LNG in back cavity there is higher pressure, the hydrodynamic pressure after centrifugal pump is increased, back cavity and sidewall channel connection, to liquid outlet, can be discharged LNG from liquid outlet.LNG immersed pump of the present utility model, simple in structure, working flow is large, can increase work efficiency, and increases the flow of LNG, is applicable to various working environments.
LNG immersed pump of the present utility model, described flow liquid passage is four, is distributed in around the center line of motor upper cover; Described flow liquid passage is with respect to the center line angle of inclination a=25 ° of upper cover body, and described flow liquid passage is intersected in liquid outlet.
Owing to having adopted said structure, the quantity of flow liquid passage 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, has reduced the resistance of fluid, and liquid is without turning, and dynamic pressure is fallen less, and the performance of pump entirety is all increased.
LNG immersed pump of the present utility model, described liquid entering hole, active chamber, impeller, collector and motor upper cover all adopt stainless steel material to make.
Owing to having adopted said structure, make the parts in whole LNG immersed pump all adopt stainless steel material to make, stainless steel material has rust inhibition, and in LNG, shrinks evenly, the advantages such as stable mechanical property, the life-span is permanent.
In sum, owing to having adopted technique scheme, the beneficial effects of the utility model are:
LNG immersed pump of the present utility model, the inducer of LNG immersed pump and LNG immersed pump thereof, liquid is without turning when entering inducer, and dynamic pressure is fallen less, thereby is difficult for occurring cavitation; The lift that described inducer produces, to impeller supercharging, increases to some extent to the lift of pump entirety, and the performance of pump entirety is all increased.
Brief description of the drawings
Fig. 1 is the structural representation of LNG immersed pump of the present utility model;
Fig. 2 is the structural representation of inducer in the utility model.
Mark in figure: 1-liquid entering hole, 2-inducer, 3-impeller, 4-collector, 5-axle, 6-stator, 7-sidewall passage, 8-flow liquid passage, 9-liquid outlet, 2-1-inducer body, 2-2-breach, 2-3-helical blade.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in detail.
In order to make the purpose of this utility model, technological scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
As shown in Figure 1, Figure 2 and Figure 3, the inducer of the utility model LNG immersed pump, comprise the inducer body 2-1 of drum-shaped, on the outer wall of described inducer body 2-1, be evenly equipped with several helical blades 2-3, described helical blade 2-3 arranges to the helical mode of afterbody from the head, and the limit of described guide wheel body 2-1 afterbody is provided with breach 2-2.In this example, described helical blade 2-3 is three, and all extends to afterbody from the head of inducer body 2-1.Especially, described inducer body 2-1 and helical blade 2-3 all adopt stainless steel material to make.
Described inducer is between liquid entering hole and ante-chamber impeller, and inducer afterbody is fastened by screws at rotatingshaft end by this breach, and can be together with rotatingshaft high speed rotating.In the time that described inducer is worked together with impeller, the lift that inducer produces, to impeller supercharging, increases to some extent to the lift of pump entirety; The anti-cavitation performance of described inducer is high because liquid in the time entering inducer without turning, dynamic pressure is fallen less, thus be difficult for occur cavitation; Performance to pump entirety all increases.
As shown in Figure 1, LNG immersed pump of the present utility model, comprises the pump housing, is provided with sidewall passage 7 in the sidewall of the described pump housing, and the rear end of the described pump housing is connected with motor upper cover, covers and be provided with the flow liquid passage 8 being communicated with sidewall passage 7 on described motor; In the described pump housing, be provided with the stator 6 and rotor shaft 5 that cooperatively interact, described rotor shaft 5 stretches in the active chamber of pump housing front end, in described active chamber, be provided with collector 4 and be divided into ante-chamber and back cavity, described collector 4 is provided with the liquid runner excessively that is communicated with ante-chamber and back cavity, wherein in ante-chamber and back cavity, be equipped with impeller 3, described back cavity is communicated with flow liquid passage 8, and described ante-chamber is provided with liquid entering hole 1; It is characterized in that: in described liquid entering hole 1, be provided with the inducer 2 being placed on rotor shaft 5, described inducer 2 is stuck on rotor shaft 5 by breach 2-2, wherein be positioned at the impeller 3 of ante-chamber, its impeller inlet is aimed at liquid entering hole 1, especially, described flow liquid passage 8 is four, is distributed in around the center line of motor upper cover; Described flow liquid passage 8 is with respect to the center line angle of inclination a=25 ° of upper cover body 10, and described flow liquid passage 8 is intersected in liquid outlet 9.
LNG immersed pump of the present utility model, coil winding can be rotated by rotor driven axle, for whole centrifugal pump provides power source, rotor shaft impeller and helical rotation simultaneously, thereby LNG can be drawn into centrifugal pump from liquid entering hole, when described inducer is worked together with impeller, the lift that inducer produces is to impeller supercharging, lift to pump entirety increases to some extent, therefore after liquid enters in centrifugal pump, be drawn in ante-chamber through inducer, described inducer anti-cavitation performance is high, because liquid in the time entering inducer without turning, dynamic pressure is fallen less, thereby the difficult cavitation that occurs, performance to pump entirety all increases, in ante-chamber, can realize supercharging for the first time through the impeller rotating, LNG after supercharging can enter into back cavity by the liquid runner of crossing from collector, carried out supercharging for the second time by the impeller in back cavity again, make the LNG in back cavity there is higher pressure, the hydrodynamic pressure after centrifugal pump is increased, back cavity and sidewall channel connection, to liquid outlet, can be discharged LNG from liquid outlet, the quantity of flow liquid passage 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, has reduced the resistance of fluid, and liquid is without turning, and dynamic pressure is fallen less, and the performance of pump entirety is all increased.
Described liquid entering hole 1, active chamber, impeller 3, collector 4 and motor upper cover all adopt stainless steel material to make.Make the parts in whole LNG immersed pump all adopt stainless steel material to make, stainless steel material has rust inhibition, and in LNG, shrinks evenly, the advantages such as stable mechanical property, and the life-span is permanent.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all any amendments of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., all should be included within protection domain of the present utility model.
Claims (6)
1. the inducer of a LNG immersed pump, it is characterized in that: it comprises the inducer body (2-1) of drum-shaped, on the outer wall of described inducer body (2-1), be evenly equipped with several helical blades (2-3), described helical blade (2-3) arranges to the helical mode of afterbody from the head, and the limit of described guide wheel body (2-1) afterbody is provided with breach (2-2).
2. the inducer of LNG immersed pump as claimed in claim 1, is characterized in that: described helical blade (2-3) is three, and all extends to afterbody from the head of inducer body (2-1).
3. the inducer of LNG immersed pump as claimed in claim 2, is characterized in that: described inducer body (2-1) and helical blade (2-3) all adopt stainless steel material to make.
4. one kind adopts the LNG immersed pump of the inducer described in claim 1 or 2 or 3, it is characterized in that: it comprises the pump housing, in the sidewall of the described pump housing, be provided with sidewall passage (7), the rear end of the described pump housing is connected with motor upper cover, covers and be provided with the flow liquid passage (8) being communicated with sidewall passage (7) on described motor; In the described pump housing, be provided with the stator (6) and rotor shaft (5) that cooperatively interact, described rotor shaft (5) stretches in the active chamber of pump housing front end, in described active chamber, be provided with collector (4) and be divided into ante-chamber and back cavity, described collector (4) is provided with the liquid runner excessively that is communicated with ante-chamber and back cavity, wherein in ante-chamber and back cavity, be equipped with impeller (3), described back cavity is communicated with flow liquid passage (8), and described ante-chamber is provided with liquid entering hole (1); It is characterized in that: in described liquid entering hole (1), be provided with the inducer (2) being placed on rotor shaft (5), described inducer (2) is stuck on rotor shaft (5) by breach (2-2), wherein be positioned at the impeller (3) of ante-chamber, its impeller inlet is aimed at liquid entering hole (1).
5. LNG immersed pump as claimed in claim 4, is characterized in that: described flow liquid passage (8) is four, is distributed in around the center line of motor upper cover; Described flow liquid passage (8) is with respect to the center line angle of inclination a=25 ° of upper cover body (10), and described flow liquid passage (8) is intersected in liquid outlet (9).
6. the LNG immersed pump as described in claim 4 or 5, is characterized in that: described liquid entering hole (1), active chamber, impeller (3), collector (4) and motor upper cover all adopt stainless steel material to make.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320701604.XU CN203685671U (en) | 2013-11-08 | 2013-11-08 | Inducer of LNG (Liquefied Natural Gas) submerged pump and LNG submerged pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320701604.XU CN203685671U (en) | 2013-11-08 | 2013-11-08 | Inducer of LNG (Liquefied Natural Gas) submerged pump and LNG submerged pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203685671U true CN203685671U (en) | 2014-07-02 |
Family
ID=51007579
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320701604.XU Expired - Lifetime CN203685671U (en) | 2013-11-08 | 2013-11-08 | Inducer of LNG (Liquefied Natural Gas) submerged pump and LNG submerged pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203685671U (en) |
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2013
- 2013-11-08 CN CN201320701604.XU patent/CN203685671U/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140702 |