CN202483903U - Liquefied natural gas (LNG) immersed pump - Google Patents
Liquefied natural gas (LNG) immersed pump Download PDFInfo
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- CN202483903U CN202483903U CN 201220067747 CN201220067747U CN202483903U CN 202483903 U CN202483903 U CN 202483903U CN 201220067747 CN201220067747 CN 201220067747 CN 201220067747 U CN201220067747 U CN 201220067747U CN 202483903 U CN202483903 U CN 202483903U
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Abstract
A liquefied natural gas (LNG) immersed pump comprises a shell body. A liquid inlet, an air inlet and a liquid discharging opening are arranged on the shell body, a pump jacket is arranged in the shell body, a vacuum interlayer is arranged between the shell body and the pump jacket, a pump body is arranged in the pump jacket, a liquid transferring tube on the pump body is connected on the liquid discharging opening, a liquid discharging tube which stretches in the pump jacket is arranged on the shell body, and the bottom end of the liquid discharging tube is arranged on the bottom of the pump jacket. The pump body with a centrifugal structure is adopted, and the pump body is high in rotating speed and light in weight. The designed LNG immersed pump is stable and reliable in the operation process, leakage is avoided, an operation state of a motor is good under a low-temperature environment, sealing of a power cable is reliable and safe, burning and explosion problems do not exist, a motor bearing is adequate in lubrication, and influence of a thermal stress to the pump is small. The structural design of the LNG immersed pump is that a shielded motor and the pump body are completely immersed in low-temperature liquid, and therefore zero-leakage is achieved. The LNG immersed pump can meet the requirements of big quantity of flow and high pressure on an outlet, is good in structure and overall property, and can widely apply to various low-temperature processes.
Description
Technical field
The utility model relates to a kind of LNG immersed pump.
Background technique
LNG is that (under the normal pressure that rock gas is freezing to about-162 ℃, can make it become liquid is LNG Liquefied natural gas to LNG Liquefied natural gas for Liquefied Natural Gas, abbreviation LNG).It is a rock gas through after purifying (dewatering, take off hydrocarbon, acid gas removal body), adopts throttling, expands and the technology that adds the low-temperature receiver refrigeration makes methane become liquid to form.The volume of LNG is about the l/620 of its gaseous state volume.Therefore LNG Liquefied natural gas is the effective means that rock gas stores and transports, and has obtained development rapidly in recent years.LNG applies as new automobile fuel at home, and prospect is appreciable.The capital equipment of LNG Vehicle Fueling Station has: LNG storage tank, LNG cryopump and LNG filling machine.The LNG storage tank is a kind of double-layer vacuum thermally insulated container, and domestic technique is ripe at present, can produce the jar of 50～200m3 size.And LNG cryopump and LNG filling machine development of equipments, domestic starting late, at present main dependence on import.The LNG immersed pump be a kind of with pump and motor 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 present independent development need solve comprises: the research of LNG immersed pump electrical equipment mainly is the lubricated cooling technology research and the several aspects of motor low-temperature working characteristic research of the research of low temperature electrically insulating material and cryocable, the The Seal Technology Study that is electrically connected the place, latent liquid type motor; The research of the LNG immersed pump pump housing mainly is LNG cavitation rule research in pump, the research of low temperature immersed pump impeller and inducer structural design and optimization and LNG immersed pump self-balancing mechanism.
The maximum characteristics of LNG immersed pump be pump and motor integral installation in the canister of a sealing, impeller is directly installed on the main shaft of motor, thereby becomes as a whole and need not the axle envelope, does not therefore have the leakage problem of LNG.Because the performance that the low temperature of LNG and inflammable characteristic, transfer pump not only will can be born low temperature, and require higher to the tightness and the electrical safety performance of pump.Because the inlet/outlet of pump links to each other with delivery line with flange arrangement, so its sealing problem is exactly the sealing that is electrically connected the place.In addition; The balance problem that contingent LNG gasification in the lubricated and cooling of motor among the low temperature LNG, the pump housing, rotor and the shared the same axis of pump housing impeller are brought etc.; Become the main feature that the LNG immersed pump is different from the general pump housing, addressing these problems is the key point of development LNG immersed pump.
Summary of the invention
The utility model will solve the shortcoming of above-mentioned existing technology, and a kind of LNG immersed pump is provided, and its reasonable in design has good sealing property, balance, moves in the cryogenic conditions long-term safety.
The utility model solves the technological scheme that its technology is asked employing: this LNG immersed pump, comprise housing, and housing is provided with liquid entering hole, suction port, liquid port; Be provided with the pump chuck in the housing; Be provided with vacuum sandwich between housing and the pump chuck, be provided with the pump housing in the pump chuck, the indusion tube on the pump housing is connected on the liquid port; Its middle shell is provided with the liquid-discharging tube that stretches in the pump chuck, and the bottom of liquid-discharging tube is positioned at the bottom of pump chuck.
The pump housing comprises pump shaft; Pump shaft is installed on the bearing of fixed plate; Wherein fixed plate is provided with and is installed in the outer thrust-balancing mechanism of pump shaft, and thrust-balancing mechanism below is provided with restrictor ring, and wherein the joint between thrust-balancing mechanism, the pump housing and the restrictor ring is respectively equipped with wear ring, following wear ring.Balance for end thrust has adopted the TEM of thrust-balancing mechanism (Thrust Equalizing Mechanism) to come balancing axial thrust; The last wear ring diameter of TEM is greater than following wear ring; Cause in the high-speed rotation process and to make a concerted effort upwards, so all rotatable parts on the pump shaft move up, this moment, the restrictor ring of impeller was regulated the spacing of dwindling it and fixed plate; Flowing of restricted passage wear ring, and cause that upper chamber pressure increases.Because the increase of upper chamber pressure, this moment, thrust was downward, and rotary component moves down again, so the distance change between fixed plate and impeller restrictor ring is big, and upper chamber pressure reduces.Through the continuous repeatedly self-regulation of TEM, can make and utilize the running under zero end thrust state of the lubricated spheric thrust bearing of LNG, improve the reliability of bearing widely, and prolonged the working life of LNG immersed pump.
Lead to the outer cable of housing on the pump housing, be sealed and installed with the anti-explosion terminal box of conjunction cable on its middle shell.Because it is external that the power cable of motor needs, power cable outer package is needed absolute sealing.In order to adapt to low temperature environment, cable adopts polyester belt and polyethylene composite paper as isolation layer, can make it low temperature resistant, is difficult for aging distortion.Adopt two O type circles sealings, compress the special seal that sealing and self-tightening sealing combine by the sealing of the external power cable of housing part; Guarantee that sealing is reliable; Be to reduce the wiring link, being connected between stator and the housing take enameled cable directly to do and be connected on the copper wiring terminal after insulation is handled, have anti-explosion terminal box to be connected on seal arrangement after; To prevent that LNG from leaking into terminal box along cable and running into spark and blast from the joint; For reaching the sealing explosion-proof, at external cable and terminal box place two road nitrogen-sealed protective systems are set during design, the possible leakage way of blocking-up LNG.If the first road N2 protects inefficacy, but second road N2 sealing system proper functioning still, and first road N2 protection when losing efficacy its pressure have significant change, report to the police to safety monitoring assembly thus.
The effect that the utility model is useful is: the utility model adopts the centrifugal structure pump housing, and rotating speed is high, in light weight, and the LNG immersed pump work running of design is reliable and stable; Do not have and leak; The work running state of motor under low temperature environment is good, and there is not the combustion explosion problem in power cable reliable and secure to external sealed; Motor bearings is lubricated fully, and the pump stress influence of being heated is little.Its structural design is that the shield electric machine and the pump housing all are immersed in the cryogenic liquide, reaches the mode of zero leakage.It is big that this pump will satisfy flow, the requirement that outlet pressure is high, and structure and overall performance are good, can be widely used in the various low temperature process processes.
Description of drawings
Fig. 1 is the whole sectional view of the utility model;
Fig. 2 is the local sectional view of the utility model pump housing.
Description of reference numerals: housing 1, pump chuck 2, vacuum sandwich 3, the pump housing 4, indusion tube 4-1, liquid entering hole 5; Suction port 6, liquid port 7, anti-explosion terminal box 8, cable 9, liquid-discharging tube 10, pump shaft 11; Bearing 12, fixed plate 13, thrust-balancing mechanism 14, restrictor ring 15, last wear ring 16, following wear ring 17.
Embodiment
Below in conjunction with accompanying drawing the utility model is described further:
With reference to accompanying drawing: this LNG immersed pump, comprise housing 1, housing 1 is provided with liquid entering hole 5, suction port 6, liquid port 7; Be provided with pump chuck 2 in the housing 1; Be provided with vacuum sandwich 3 between housing 1 and the pump chuck 2, be provided with the pump housing 4 in the pump chuck 2, the indusion tube 4-1 on the pump housing 4 is connected on the liquid port 7; Its middle shell 1 is provided with the liquid-discharging tube 10 that stretches in the pump chuck 2, and the bottom of liquid-discharging tube 10 is positioned at the bottom of pump chuck 2.The pump housing 4 comprises pump shaft 11; Pump shaft 11 is installed on the bearing 12 of fixed plate 13; Wherein fixed plate 13 is provided with the thrust-balancing mechanism 14 that is installed in outside the pump shaft 4; Thrust-balancing mechanism 14 belows are provided with restrictor ring 15, and wherein the joint between thrust-balancing mechanism 14, the pump housing 4 and the restrictor ring 15 is respectively equipped with wear ring 16, following wear ring 17.The pump housing 4 is provided with the cable 9 that leads to outside the housing 1, is sealed and installed with the anti-explosion terminal box 8 of conjunction cable 9 on its middle shell 1.
The relevant issues of liquid motor solve 1.1 low temperature is dived
Because motor immerses in the cryogenic liquide, just need to guarantee that motor can not be breakdown in cryogenic liquide, at first be can not be breakdown between stator and the rotor, be exactly can not be breakdown between the turn-to-turn line then.Handle through the silicon steel sheet gap of motor being done insulation; The cable coil adopts the enameled cable of insulation resin lacquer; And the enameled cable of insulation resin lacquer is carried out sub zero treatment through liquid nitrogen; Guarantee the electrical machine insulation performance, low temperature glue foaming treatment is made in the motor stator space, prevents partial discharge and corona damages winding.
Because it is external that the power cable of motor needs, power cable outer package is needed absolute sealing.In order to adapt to low temperature environment, cable adopts polyester belt and polyethylene composite paper as isolation layer, can make it low temperature resistant, is difficult for aging distortion.Adopt two O type circles sealings, compress the special seal that sealing and self-tightening sealing combine by the sealing of the external power cable of housing part; Guarantee that sealing is reliable; Be to reduce the wiring link, being connected between stator and the housing take enameled cable directly to do and be connected on the copper wiring terminal after insulation is handled, have anti-explosion terminal box to be connected on seal arrangement after; To prevent that LNG from leaking into terminal box along cable and running into spark and blast from the joint; For reaching the sealing explosion-proof, at external cable and terminal box place two road nitrogen-sealed protective systems are set during design, the possible leakage way of blocking-up LNG.If the first road N2 protects inefficacy, but second road N2 sealing system proper functioning still, and first road N2 protection when losing efficacy its pressure have significant change, report to the police to safety monitoring assembly thus.
1.2 the equilibrium problem of LNG immersed pump solves
When design LNG immersed pump, must consider fluid and mechanical aspects because the negative effect that force unbalance produced when design and manufacturing, just should be eliminated unbalanced force as much as possible.Because the structure of LNG immersed pump is that motor is coaxial with impeller; Therefore the end thrust and the radial force that in motor runs up process, produce receive force unbalance can directly influence the working life of pump and motor; And under this cryogenic environment under-196 ℃ the cryogenic environment, bearing can not adopt oil lubrication, but introduces a spot of LNG flushing to avoid bearing heating and lubricated effect; End thrust and radial force influence the state of liquid film, very easily cause serious wearing and tearing.
Balance for end thrust has adopted (the Thrust Equalizing Mechanism of thrust-balancing mechanism; TEM) come balancing axial thrust, shown in accompanying drawing 2: the last wear ring diameter of TEM causes and makes a concerted effort in the high-speed rotation process upwards greater than following wear ring; Therefore all rotatable parts on the pump shaft move up; The restrictor ring of impeller was regulated and to be dwindled it and the spacing of fixed plate this moment, the flowing of restricted passage wear ring, and cause the increase of upper chamber pressure.Because the increase of upper chamber pressure, this moment, thrust was downward, and rotary component moves down again, so the distance change between fixed plate and impeller restrictor ring is big, and upper chamber pressure reduces.Through the continuous repeatedly self-regulation of TEM, can make and utilize the running under zero end thrust state of the lubricated spheric thrust bearing of LNG, improve the reliability of bearing widely, and prolonged the working life of LNG immersed pump.
Radially equilibrium of forces adopts symmetrical diffuser vane to realize, cryogenic LNG flows out the back and gets into axial diffuser from impeller, and the axial diffusion utensil has good waterpower symmetry properties.Because diffuser and fluid are symmetrical, under its range of flow, have perfect hydraulic pressure symmetry properties.When pump reached design discharge, the radial force of latent liquid type LNG pumping action on impeller was zero in theory.
1.3 the solution of cavitation erosion problem
In order to prevent to produce cavitation erosion at pump intake, reduce the resistance of fluid at suction port, be provided with the helical fluid director at suction port.Entire pump is installed in the rustless steel container, and rustless steel container has gas, liquid centrifugation, according to the pressure container standard manufacturing.Pump intake is positioned at lower position, guarantees that suction port is in the liquid.The application of helical fluid director and rustless steel container makes the LNG pump can reach due net positive suction head (NPSH) (NPSHR), and this helps improving the water conservancy characteristic, reduces the requirement of pump to net positive suction head (NPSH), prevents to produce cavitation erosion at pump intake.
1.4 the solution of thermal stress issues
When the LNG immersed pump started, the effect of thermal stress may cause pump crackle and locking to occur phenomenon such as can not rotating and damage pump.In order to prevent this phenomenon, can adopt the suspended wall type on the structure, make that integral body is shunk to the top under low temperature environment, pump housing matching part is selected the close material of thermal expansion coefficient for use, avoids the different locking seminesses that produce of shrinkage degree under the low temperature environment; Monitor the pump discharge temperature in real time through temperature transducer simultaneously, show according to the outlet temperature temperature, valve before and after the adjustment pump, the control pump precooling time, experiment shows that this method seems quite effective when solving thermal stress issues.
Though the utility model is through illustrating and describe with reference to preferred embodiment,, those skilled in the art should understand, and in the scope of claims, can do the various variation on form and the details.
Claims (3)
1. LNG immersed pump; Comprise housing (1); Housing (1) is provided with liquid entering hole (5), suction port (6), liquid port (7), it is characterized in that: be provided with pump chuck (2) in the said housing (1), be provided with vacuum sandwich (3) between housing (1) and the pump chuck (2); Be provided with the pump housing (4) in the pump chuck (2); Indusion tube (4-1) on the pump housing (4) is connected on the liquid port (7), and said housing (1) is provided with the liquid-discharging tube (10) that stretches in the pump chuck (2), and the bottom of liquid-discharging tube (10) is positioned at the bottom of pump chuck (2).
2. LNG immersed pump according to claim 1; It is characterized in that: the said pump housing (4) comprises pump shaft (11); Pump shaft (11) is installed on the bearing (12) of fixed plate (13); Said fixed plate (13) is provided with and is installed in the outer thrust-balancing mechanism (14) of pump shaft (4); Thrust-balancing mechanism (14) below is provided with restrictor ring (15), and the joint between said thrust-balancing mechanism (14), the pump housing (4) and the restrictor ring (15) is respectively equipped with wear ring (16), following wear ring (17).
3. LNG immersed pump according to claim 1 is characterized in that: the said pump housing (4) is provided with and leads to the outer cable (9) of housing (1), is sealed and installed with the anti-explosion terminal box (8) of conjunction cable (9) on the said housing (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220067747 CN202483903U (en) | 2012-02-28 | 2012-02-28 | Liquefied natural gas (LNG) immersed pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220067747 CN202483903U (en) | 2012-02-28 | 2012-02-28 | Liquefied natural gas (LNG) immersed pump |
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| Publication Number | Publication Date |
|---|---|
| CN202483903U true CN202483903U (en) | 2012-10-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220067747 Expired - Fee Related CN202483903U (en) | 2012-02-28 | 2012-02-28 | Liquefied natural gas (LNG) immersed pump |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103307198A (en) * | 2013-06-28 | 2013-09-18 | 江苏大学 | Pump pool inherent frequency self-adapting method and device |
| CN103821732A (en) * | 2014-02-24 | 2014-05-28 | 中国海洋石油总公司 | Vertical pump pool multi-stage immersed pump |
| CN104015679A (en) * | 2013-03-01 | 2014-09-03 | 赵彦杰 | Anti-freezing equipment for lubricating system and oil supply system of vehicle |
| CN104100537A (en) * | 2014-07-07 | 2014-10-15 | 中船重工重庆智能装备工程设计有限公司 | LNG (liquefied natural gas) immersed centrifugal pump |
| CN104329267A (en) * | 2014-09-04 | 2015-02-04 | 武汉船用机械有限责任公司 | Low-temperature submerged pump and motor thereof |
| 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 |
| CN105042329A (en) * | 2015-08-26 | 2015-11-11 | 成都华气厚普机电设备股份有限公司 | Double-layer type LNG pump well structure and storage tank comprising structure |
| CN105257556A (en) * | 2015-09-09 | 2016-01-20 | 江苏德邦工程有限公司 | Low temperature immersed pump system feeding liquefied natural gas (LNG) |
| CN105386984A (en) * | 2015-12-14 | 2016-03-09 | 大连深蓝泵业有限公司 | Vertical-type low-temperature immersed pump used for ship |
| CN107687425A (en) * | 2017-08-21 | 2018-02-13 | 王道红 | Vertical multi-stage vacuum and low temperature immersed pump |
| CN109026754A (en) * | 2018-08-24 | 2018-12-18 | 武汉船用机械有限责任公司 | A kind of pump head device |
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2012
- 2012-02-28 CN CN 201220067747 patent/CN202483903U/en not_active Expired - Fee Related
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104015679A (en) * | 2013-03-01 | 2014-09-03 | 赵彦杰 | Anti-freezing equipment for lubricating system and oil supply system of vehicle |
| CN103307198A (en) * | 2013-06-28 | 2013-09-18 | 江苏大学 | Pump pool inherent frequency self-adapting method and device |
| CN103307198B (en) * | 2013-06-28 | 2015-04-29 | 江苏大学 | Pump pool inherent frequency self-adapting device |
| CN103821732A (en) * | 2014-02-24 | 2014-05-28 | 中国海洋石油总公司 | Vertical pump pool multi-stage immersed pump |
| CN104100537A (en) * | 2014-07-07 | 2014-10-15 | 中船重工重庆智能装备工程设计有限公司 | LNG (liquefied natural gas) immersed centrifugal pump |
| CN104329267A (en) * | 2014-09-04 | 2015-02-04 | 武汉船用机械有限责任公司 | Low-temperature submerged pump and motor thereof |
| 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 |
| CN105042329A (en) * | 2015-08-26 | 2015-11-11 | 成都华气厚普机电设备股份有限公司 | Double-layer type LNG pump well structure and storage tank comprising structure |
| CN105042329B (en) * | 2015-08-26 | 2017-06-30 | 成都华气厚普机电设备股份有限公司 | Two-layer equation LNG pump well construction and the storage tank containing its structure |
| CN105257556A (en) * | 2015-09-09 | 2016-01-20 | 江苏德邦工程有限公司 | Low temperature immersed pump system feeding liquefied natural gas (LNG) |
| CN105386984A (en) * | 2015-12-14 | 2016-03-09 | 大连深蓝泵业有限公司 | Vertical-type low-temperature immersed pump used for ship |
| CN107687425A (en) * | 2017-08-21 | 2018-02-13 | 王道红 | Vertical multi-stage vacuum and low temperature immersed pump |
| CN109026754A (en) * | 2018-08-24 | 2018-12-18 | 武汉船用机械有限责任公司 | A kind of pump head device |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121010 Termination date: 20150228 |
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| EXPY | Termination of patent right or utility model |