CN104100537A - LNG (liquefied natural gas) immersed centrifugal pump - Google Patents
LNG (liquefied natural gas) immersed centrifugal pump Download PDFInfo
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- CN104100537A CN104100537A CN201410318705.8A CN201410318705A CN104100537A CN 104100537 A CN104100537 A CN 104100537A CN 201410318705 A CN201410318705 A CN 201410318705A CN 104100537 A CN104100537 A CN 104100537A
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Abstract
The invention discloses an LNG (liquefied natural gas) immersed centrifugal pump. The LNG immersed centrifugal pump is characterized in that a front intake end cover (11) is disposed in the front of a rear intake end cover (9); a guidance wheel (12) is disposed inside a circular boss arranged at the center of the front end of the rear intake end cover (9); a primary blade wheel (13) is disposed at the rear of the guidance wheel (12); primary guide blades (14) are arranged at the rear of the primary blade wheel (13); a secondary blade wheel (15) is disposed at the rear of the primary guide blades (14); secondary guide blades (16) are disposed at the rear of the secondary blade wheel (15); two liquid outgoing pipes (17) are arranged at the rear of a guide blade carrier (2) and are evenly distributed around a stator (1) in the peripheral direction. The LNG immersed centrifugal pump is simple in structure, convenient to mount, small in size, light in weight and low in cost and is high in erosion resistance and good in reliability; lift and efficiency of the LNG immersed centrifugal pump can be effectively improved; the LNG immersed centrifugal pump can be a substitute for imported pumps, and the requirements of LNG stations are met; the LNG immersed centrifugal pump is suitable for large-scale popularization and application.
Description
Technical field
The invention belongs to centrifugal pump technical field, specifically, particularly a kind of LNG latent liquid type centrifugal pump.
Background technique
The visual plant of latent liquid type centrifugal pump ShiLNG gas station, is mainly used in liquid feeding, unloads and pressure regulation.At present, the latent liquid type centrifugal pump that China most of LNG gas station is used all depends on import, and price is very expensive.Although some producers are are also actively researching and developing the latent liquid type centrifugal pump product for LNG gas station, but ubiquity complex structure, assembling difficulty, anti-cavitation erosion ability are weak, lift and the deficiency such as efficiency is undesirable, performance does not reach the performance requirement of pump two machines under gas station actual conditions, is difficult to large-scale promotion application.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of LNG latent liquid type centrifugal pump simple in structure, reliable.
Technological scheme of the present invention is as follows: a kind of LNG latent liquid type centrifugal pump, front end at stator (1) arranges stator frame (2), rear end arranges fluid end cap (3), in described stator (1), be provided with rotor (4), this rotor (4) is set in the rear portion of rotating shaft (5), support mutually by bearing and rear bearing block (6) rear end of rotating shaft (5), rear bearing block (6) is fixed on the front end of fluid end cap (3), the middle front part of described rotating shaft (5) supports mutually by bearing and front-end bearing pedestal (7), and front-end bearing pedestal (7) is fixed in stator frame (2), in the place ahead of described stator frame (2), be fixedly installed stator cover (8), the place ahead of this stator cover (8) is provided with rear suction end cap (9), in the place ahead of described rear suction end cap (9), front suction end cap (11) is set, this front suction end cap (11) is placed on the annular boss of rear suction end cap (9) front end central authorities admittedly, in the annular boss of rear suction end cap (9) front end central authorities, be provided with inducer (12), this inducer (12) is placed on the front end of rotating shaft (5) admittedly, at the rear of inducer (12), be provided with one-level impeller (13), one-level impeller (13) is positioned at rear suction end cap (9), and be admittedly placed in rotating shaft (5), at the rear of one-level impeller (13), one-level stator (14) is set, one-level stator (14) is fixed on the front end of stator cover (8), at the rear of one-level stator (14), be provided with sencond stage impeller (15), sencond stage impeller (15) is placed in rotating shaft (5) admittedly, and the rear of sencond stage impeller (15) is provided with secondary stator (16), described secondary stator (16) is positioned at stator cover (8), and fix with stator frame (2), at the rear of described stator frame (2), be provided with two drain pipes (17), these two drain pipes (17) are pressed even circumferential and are distributed in the periphery of stator (1), the import of each drain pipe (17) is communicated with the liquid interface that goes out on stator frame (2), and the outlet of drain pipe (17) is communicated with the liquid outlet channel (3a) on fluid end cap (3).
Adopt above technological scheme, in rotor running, inducer, one-level impeller rotate with rotor with sencond stage impeller, the suction that impeller operation produces sucks end cap before the liquid of outside is sucked, liquid flows to one-level impeller after inducer guiding, then by one-level stator guiding sencond stage impeller, then by secondary stator guiding stator frame, finally by two drain pipes, flow to fluid end cap, until from the outlet efflux pump of fluid end cap.
The present invention is simple in structure, compact, and volume is small and exquisite, easy accessibility, and cost is low; Adopt inducer to coordinate to mate on waterpower flows with main impeller, can effectively improve the anti-cavitation erosion ability of pump, make pump there is higher lift; Both stage impellers collaborative work, can further increase the flow and lift of pump; Adopt two drain pipes to be connected to outlet end and cover, simple structure, can reduce linear loss, is conducive to improve the efficiency of pump; Drain pipe is arranged symmetrically with, and has effectively reduced the impact of thermal stress on pump distortion under deep cooling operating mode.
For convenient for assembly, strengthen the fixing connecting, between described rear suction end cap (9), stator frame (2) and fluid end cap (3) three, by equally distributed screw rod (10) on circumference, be connected and fixed.
The leading portion of described front suction end cap (11) is tubaeform, back segment is straight tube, filter screen (18) is installed at the front port place of front suction end cap (11), the back segment of front suction end cap (11) by thread set on the annular boss of rear suction end cap (9) front end central authorities.Before above structure, suck end cap moulding simple, be easy to processing and fabricating; Front suction end cap leading portion is tubaeform, is conducive to liquid and enters; Impurity in filter screen energy filtering liquid, prevents from that impurity from entering in pump, result in blockage and damage flow passage components; Front suction end cap adopts straight tube and the rear suction end cap screw-thread fit of back segment, and not only easy accessibility, quick, and connection not only firmly but also reliable.
Described inducer (12) is comprised of wheel hub (12a) and blade (12b), wheel hub (12a) is straight tube structure, on the excircle of wheel hub (12a), be provided with spiral vane (12b), the front end of this blade (12b) is provided with wedge-shaped segment, and the direction of the thickness of blade (12b) from root to edge reduces gradually.Above structure is not only easy to processing and fabricating, and guiding liquids flow effective, improved the energy of impeller inlet, after the cavitation erosion that guarantees impeller occurs in the cavitation erosion of inducer, thereby further improved the anti-cavitation erosion ability of pump.
In order to prevent that dust from entering in pump from outlet, is equipped with dust cover (19) in the outlet of described fluid end cap (3) rear end.
Beneficial effect: the present invention not only simple in structure, easy for installation, volume is little, lightweight, cost is low; And anti-cavitation erosion ability is strong, good reliability, can effectively improve lift of pump and efficiency, can substituting import one product meets the requirement of LNG gas station, is suitable for large-scale promotion application.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Fig. 2 is the structural representation of inducer.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described:
As shown in Figure 1, at the front end fixed installation stator frame 2 of stator 1, this stator frame 2 is by the front end closure of stator 1.The rear end fixed installation fluid end cap 3 of stator 1, fluid end cap 3 is by the rear end closure of stator.The rotor 4 matching with stator 1 is positioned at stator 1, and this rotor 4 is set in the rear portion of rotating shaft 5.Support mutually by bearing and rear bearing block 6 rear end of rotating shaft 5, and rear bearing block 6 is positioned at the place ahead of fluid end cap 3, and the middle part of rear bearing block 6 by bolt and fluid end cap 3 front ends fixes.The middle front part of rotating shaft 5 supports mutually by bearing and front-end bearing pedestal 7, and front-end bearing pedestal 7 is positioned at stator frame 2, and front-end bearing pedestal 7 fixes by bolt and stator frame 2.
As shown in Figure 1 and Figure 2, at the place ahead of stator frame 2 fixed installation stator cover 8, the place ahead of this stator cover 8 is provided with rear suction end cap 9, between rear suction end cap 9, stator frame 2 and fluid end cap 3 threes, by equally distributed screw rod 10 on circumference, is connected and fixed.Before the place ahead of rear suction end cap 9 arranges, suck end cap 11, the leading portion of this front suction end cap 11 is tubaeform, and back segment is straight tube.Filter screen 18 is installed at the front port place of front suction end cap 11, the back segment of front suction end cap 11 by thread set on the annular boss of rear suction end cap 9 front end central authorities.In the annular boss of rear suction end cap 9 front end central authorities, be provided with inducer 12, this inducer 12 is comprised of wheel hub 12a and blade 12b.Wheel hub 12a is straight tube structure, and is admittedly placed on the front end of rotating shaft 5.On the excircle of wheel hub 12a, be formed with the spiral vane 12b of uniform pitch, the front end of this blade 12b is provided with wedge-shaped segment, and the direction of the thickness of blade 12b from root to edge reduces gradually.
As shown in Figure 1, at the rear of inducer 12, be provided with one-level impeller 13, one-level impeller 13 is positioned at rear suction end cap 9, and be admittedly placed in rotating shaft 5, at the rear of one-level impeller 13, one-level stator 14 is set, one-level stator 14 is positioned at rear suction end cap 9, and near one-level impeller 13, and one-level stator 14 is fixed on the front end of stator cover 8.At the rear of one-level stator 14, be provided with sencond stage impeller 15, sencond stage impeller 15 is positioned at stator cover 8, and is admittedly placed in rotating shaft 5.At the rear of sencond stage impeller 15, be provided with secondary stator 16, described secondary stator 16 is positioned at stator cover 8, and near sencond stage impeller 15, and secondary stator 16 fixes with stator frame 2.At the rear of described stator frame 2, be provided with two drain pipes 17, these two drain pipes 17 are pressed even circumferential and are distributed in the periphery of stator 1, and the import of each drain pipe 17 is communicated with the liquid interface that goes out on stator frame 2.In the front portion of fluid end cap 3, be symmetrically arranged with two liquid outlet channel 3a, these two liquid outlet channel 3a are corresponding one by one with two drain pipes 17, and the import of the corresponding liquid outlet channel 3a of outlet of drain pipe 17 is communicated with.The back segment of fluid end cap 3 is straight tube-like, and the import of this straight tube is communicated with the outlet of liquid outlet channel 3a, and dust cover 19 is housed in the outlet of straight tube rear end.
Working principle of the present invention is as follows:
In rotor 5 runnings, inducer 12, one-level impeller 13 and sencond stage impeller 15 rotate with rotor 5, the suction that impeller operation produces sucks end cap 11 before the liquid of outside is sucked, liquid flows to one-level impeller 13 after inducer 12 guiding, then by one-level stator 14 guiding sencond stage impellers 15, by secondary stator 16 guiding stator framves 2, finally by two drain pipes 17, flow to fluid end cap 3, until from the outlet efflux pump of fluid end cap 3 again.
Claims (5)
1. a LNG latent liquid type centrifugal pump, it is characterized in that: the front end at stator (1) arranges stator frame (2), rear end arranges fluid end cap (3), in described stator (1), be provided with rotor (4), this rotor (4) is set in the rear portion of rotating shaft (5), support mutually by bearing and rear bearing block (6) rear end of rotating shaft (5), rear bearing block (6) is fixed on the front end of fluid end cap (3), the middle front part of described rotating shaft (5) supports mutually by bearing and front-end bearing pedestal (7), and front-end bearing pedestal (7) is fixed in stator frame (2), in the place ahead of described stator frame (2), be fixedly installed stator cover (8), the place ahead of this stator cover (8) is provided with rear suction end cap (9), in the place ahead of described rear suction end cap (9), front suction end cap (11) is set, this front suction end cap (11) is placed on the annular boss of rear suction end cap (9) front end central authorities admittedly, in the annular boss of rear suction end cap (9) front end central authorities, be provided with inducer (12), this inducer (12) is placed on the front end of rotating shaft (5) admittedly, at the rear of inducer (12), be provided with one-level impeller (13), one-level impeller (13) is positioned at rear suction end cap (9), and be admittedly placed in rotating shaft (5), at the rear of one-level impeller (13), one-level stator (14) is set, one-level stator (14) is fixed on the front end of stator cover (8), at the rear of one-level stator (14), be provided with sencond stage impeller (15), sencond stage impeller (15) is placed in rotating shaft (5) admittedly, and the rear of sencond stage impeller (15) is provided with secondary stator (16), described secondary stator (16) is positioned at stator cover (8), and fix with stator frame (2), at the rear of described stator frame (2), be provided with two drain pipes (17), these two drain pipes (17) are pressed even circumferential and are distributed in the periphery of stator (1), the import of each drain pipe (17) is communicated with the liquid interface that goes out on stator frame (2), and the outlet of drain pipe (17) is communicated with the liquid outlet channel (3a) on fluid end cap (3).
2. LNG latent liquid type centrifugal pump according to claim 1, is characterized in that: between described rear suction end cap (9), stator frame (2) and fluid end cap (3) three, by equally distributed screw rod (10) on circumference, be connected and fixed.
3. LNG latent liquid type centrifugal pump according to claim 1, it is characterized in that: the leading portion of described front suction end cap (11) is tubaeform, back segment is straight tube, filter screen (18) is installed at the front port place of front suction end cap (11), the back segment of front suction end cap (11) by thread set on the annular boss of rear suction end cap (9) front end central authorities.
4. according to the LNG latent liquid type centrifugal pump described in claim 1 or 2 or 3, it is characterized in that: described inducer (12) is comprised of wheel hub (12a) and blade (12b), wheel hub (12a) is straight tube structure, on the excircle of wheel hub (12a), be provided with spiral vane (12b), the front end of this blade (12b) is provided with wedge-shaped segment, and the direction of the thickness of blade (12b) from root to edge reduces gradually.
5. LNG latent liquid type centrifugal pump according to claim 1, is characterized in that: dust cover (19) is housed in the outlet of described fluid end cap (3) rear end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410318705.8A CN104100537A (en) | 2014-07-07 | 2014-07-07 | LNG (liquefied natural gas) immersed centrifugal pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410318705.8A CN104100537A (en) | 2014-07-07 | 2014-07-07 | LNG (liquefied natural gas) immersed centrifugal pump |
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| Publication Number | Publication Date |
|---|---|
| CN104100537A true CN104100537A (en) | 2014-10-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410318705.8A Pending CN104100537A (en) | 2014-07-07 | 2014-07-07 | LNG (liquefied natural gas) immersed centrifugal pump |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104389795A (en) * | 2014-10-31 | 2015-03-04 | 湖州三井低温设备有限公司 | LNG (Liquefied Natural Gas) immersed pump |
| CN104895800A (en) * | 2015-05-19 | 2015-09-09 | 淄博博山绿源燃气设备有限公司 | Multi-stage submersible pump system |
| CN105811609A (en) * | 2016-04-26 | 2016-07-27 | 湖南耐普泵业股份有限公司 | Submerged type cryogenic permanent magnet electric pump |
| CN107681822A (en) * | 2017-09-25 | 2018-02-09 | 湖南大学 | Efficient cryogenic motor for latent liquid type LNG pump |
| CN112851078A (en) * | 2021-03-26 | 2021-05-28 | 中船重工重庆智能装备工程设计有限公司 | Automatic medicine adding device and spiral extrusion dewatering system |
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| US20020114714A1 (en) * | 2001-02-21 | 2002-08-22 | Hitoshi Sato | Centrifugal pump |
| CN202483903U (en) * | 2012-02-28 | 2012-10-10 | 浙江机电职业技术学院 | Liquefied natural gas (LNG) immersed pump |
| CN102996469A (en) * | 2012-12-24 | 2013-03-27 | 成都安迪生测量有限公司 | Low-temperature immersed pump sealed by multiple-head spirals |
| CN103573651A (en) * | 2013-11-08 | 2014-02-12 | 成都安迪生测量有限公司 | LNG immersed pump |
| CN103821732A (en) * | 2014-02-24 | 2014-05-28 | 中国海洋石油总公司 | Vertical pump pool multi-stage immersed pump |
| CN204003508U (en) * | 2014-07-07 | 2014-12-10 | 中船重工重庆智能装备工程设计有限公司 | A kind of LNG latent liquid type centrifugal pump |
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2014
- 2014-07-07 CN CN201410318705.8A patent/CN104100537A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020114714A1 (en) * | 2001-02-21 | 2002-08-22 | Hitoshi Sato | Centrifugal pump |
| CN202483903U (en) * | 2012-02-28 | 2012-10-10 | 浙江机电职业技术学院 | Liquefied natural gas (LNG) immersed pump |
| CN102996469A (en) * | 2012-12-24 | 2013-03-27 | 成都安迪生测量有限公司 | Low-temperature immersed pump sealed by multiple-head spirals |
| CN103573651A (en) * | 2013-11-08 | 2014-02-12 | 成都安迪生测量有限公司 | LNG immersed pump |
| CN103821732A (en) * | 2014-02-24 | 2014-05-28 | 中国海洋石油总公司 | Vertical pump pool multi-stage immersed pump |
| CN204003508U (en) * | 2014-07-07 | 2014-12-10 | 中船重工重庆智能装备工程设计有限公司 | A kind of LNG latent liquid type centrifugal pump |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104389795A (en) * | 2014-10-31 | 2015-03-04 | 湖州三井低温设备有限公司 | LNG (Liquefied Natural Gas) immersed pump |
| CN104895800A (en) * | 2015-05-19 | 2015-09-09 | 淄博博山绿源燃气设备有限公司 | Multi-stage submersible pump system |
| CN104895800B (en) * | 2015-05-19 | 2017-11-17 | 淄博博山绿源燃气设备有限公司 | Multistage immersed pump system |
| CN105811609A (en) * | 2016-04-26 | 2016-07-27 | 湖南耐普泵业股份有限公司 | Submerged type cryogenic permanent magnet electric pump |
| CN105811609B (en) * | 2016-04-26 | 2018-09-21 | 湖南耐普泵业股份有限公司 | Submergence type deep cooling permanent magnetism electric pump |
| CN107681822A (en) * | 2017-09-25 | 2018-02-09 | 湖南大学 | Efficient cryogenic motor for latent liquid type LNG pump |
| CN112851078A (en) * | 2021-03-26 | 2021-05-28 | 中船重工重庆智能装备工程设计有限公司 | Automatic medicine adding device and spiral extrusion dewatering system |
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Application publication date: 20141015 |
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