CN111648978A - LNG multistage immersed pump - Google Patents

LNG multistage immersed pump Download PDF

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Publication number
CN111648978A
CN111648978A CN202010512032.5A CN202010512032A CN111648978A CN 111648978 A CN111648978 A CN 111648978A CN 202010512032 A CN202010512032 A CN 202010512032A CN 111648978 A CN111648978 A CN 111648978A
Authority
CN
China
Prior art keywords
section
positioning sleeve
impeller
pump
lng
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202010512032.5A
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Chinese (zh)
Inventor
朱祖超
杨世栋
李晓俊
张炜
陈小平
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zhejiang University of Technology ZJUT
Zhejiang Sci Tech University ZSTU
Zhejiang Institute of Mechanical and Electrical Engineering Co Ltd
Zhejiang University of Science and Technology ZUST
Original Assignee
Zhejiang University of Technology ZJUT
Zhejiang Institute of Mechanical and Electrical Engineering Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Zhejiang University of Technology ZJUT, Zhejiang Institute of Mechanical and Electrical Engineering Co Ltd filed Critical Zhejiang University of Technology ZJUT
Priority to CN202010512032.5A priority Critical patent/CN111648978A/en
Publication of CN111648978A publication Critical patent/CN111648978A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D1/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D1/06—Multi-stage pumps
    • 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
    • F04D29/02—Selection of particular materials
    • F04D29/026—Selection of particular materials especially adapted for liquid pumps
    • 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
    • F04D29/20—Mounting rotors on shafts
    • 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
    • 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
    • F04D29/2227—Construction and assembly for special materials
    • 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
    • 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
    • F04D29/60—Mounting; Assembling; Disassembling
    • F04D29/62—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps
    • F04D29/628—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps especially adapted for liquid pumps
    • 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

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

The invention relates to the field of centrifugal pumps. The technical scheme is as follows: LNG multistage immersed pump, include by going to back according to the preface and arrange and equal fixed connection's between two liang the anterior segment pump case, middle section pump case and back end pump case, fix the bearing subassembly in the anterior segment pump case, the built-in motor of fixing in the back end pump case, one end is supported by the bearing subassembly and the pump shaft of the motor shaft fixed connection of the other end and built-in motor, set up in the front end pump case and with pump shaft front end fixed connection's inducer, set up a plurality of impellers in the middle section pump case, the cover is established in the impeller outside and a plurality of guide vanes of outer fringe and middle section pump case inner wall fixed connection and is installed on the pump shaft and fix in order to balance. The immersed pump can work in a low-temperature environment, the problem of positioning of the impeller can be effectively solved, the impeller is prevented from generating circumferential displacement and axial displacement, and meanwhile, the axial forces at the two ends of the impeller are balanced with each other, so that the impeller is ensured to run stably, and the overall performance of the pump is improved.

Description

LNG multistage immersed pump
Technical Field
The invention relates to the field of centrifugal pumps, in particular to an LNG multistage immersed pump.
Background
LNG is an abbreviation for liquefied natural gas (liquefied natural gas) and the main component is methane. LNG is colorless, odorless, non-toxic, and non-corrosive, and has a volume of about 1/600 that is the same volume of gaseous natural gas. Therefore, liquefied natural gas is an effective way for storing and transporting natural gas, and has been rapidly developed in recent years, and a large amount of LNG immersed pumps are required to be used in the transportation and filling processes of the liquefied natural gas. The impeller is used as a core component of the pump, and the positioning accuracy of the impeller can directly influence the overall performance of the pump.
The main method of positioning a typical impeller on a shaft is by means of a shoulder and threads. One side of the impeller hub is tightly close to the shaft shoulder, and the other side of the impeller hub is screwed and fixed on the shaft through a threaded part, so that the axial positioning of the impeller is completed. The positioning mode is simple, but the deviation is easy to exist in the processing process of the pump shaft, and the multi-stage impeller is not suitable for positioning.
The Chinese invention patent (application number "CN 201310262314.4", application date 2013.06.27) discloses an impeller positioning structure, wherein an impeller is positioned through a taper pin, and the impeller is ensured not to be loosened by interference fit, so that the thickness of a shaft does not need to consider the additional strength of a key slot, the material is saved, and the structure is not suitable for a low-temperature working environment.
The Chinese invention patent (application number 'CN 201520827474.3', application date 2015.10.22) discloses an impeller axial positioning sleeve, which achieves the positioning effect through the pressure between the positioning sleeve and a shaft, the positioning mode is simple and reliable, but the structure only considers the axial direction without considering circumferential positioning and does not consider the characteristic of low-temperature shrinkage of the positioning sleeve material.
The Chinese invention patent (application number "CN 201720658571.3", 2017.06.07) discloses a multistage pump impeller fixing device, which utilizes interference fit between a shaft sleeve and an impeller and a screw between the shaft sleeve and the impeller to ensure the positioning of the impeller, and utilizes axial clearance, a snap ring and the impeller shaft sleeve to ensure the axial positioning of a positioning sleeve. However, at the beginning of the design, the impeller adjusting allowance is left between the snap ring and the axial gap, and when the multistage impeller works, the generated axial force can cause the shaft sleeve and the snap ring to axially slide, so that the pump is not stable in operation.
Disclosure of Invention
The invention aims to overcome the defects of the background technology and provide the LNG multistage immersed pump which can work in a low-temperature environment, can effectively solve the problem of positioning of the impeller, avoids the impeller from generating circumferential and axial displacement, and simultaneously ensures that the axial forces at two ends of the impeller are balanced with each other, thereby ensuring the stable operation of the impeller and improving the overall performance of the pump.
The technical scheme provided by the invention is as follows:
the LNG multistage immersed pump comprises a front-section pump shell, a middle-section pump shell and a rear-section pump shell which are sequentially arranged from front to back and fixedly connected with each other, a bearing assembly fixed in the front-section pump shell, a built-in motor fixed in the rear-section pump shell, a pump shaft, one end of which is supported by the bearing assembly and the other end of which is fixedly connected with a motor shaft of the built-in motor, an inducer arranged in the front-section pump shell and fixedly connected with the front end of the pump shaft, a plurality of impellers arranged in the middle-section pump shell, a plurality of guide vanes sleeved outside the impellers and fixedly connected with the inner wall of the middle-section pump shell at the outer edge, and a balance disc; the method is characterized in that:
each impeller is fixed on the pump shaft through a group of locating sleeve assemblies; the positioning sleeve assembly comprises a positioning sleeve nut section, a positioning sleeve bolt section and a positioning sleeve pin section which are sleeved on the pump shaft and fixedly connected in sequence; the positioning sleeve bolt section is in interference fit with the pump shaft, so that the positioning sleeve bolt section is fixed on the pump shaft; the positioning sleeve bolt section is fixedly connected with the positioning sleeve nut section through a thread pair; the positioning sleeve nut section is fixedly connected with one side of the impeller into a whole through a threaded fastener; the positioning sleeve pin section, the positioning sleeve bolt section and the other side of the impeller are fixedly connected into a whole through a threaded fastener; the pump shaft, the positioning sleeve nut section, the positioning sleeve bolt section, the positioning sleeve pin section and the impeller are coaxially arranged.
The bearing assembly comprises a bearing support frame, a bearing fixed on the bearing support frame and a sleeve fixed in a bearing inner ring; the pump shaft is rotatably positioned in the sleeve; the bearing support frame comprises an inner ring for fixedly mounting a bearing, an outer ring fixed on the inner wall of the front-section pump shell through screws and a plurality of ribs connected between the inner ring and the outer ring in a spoke shape.
The thread pair comprises an internal thread arranged on the inner wall of the nut section of the positioning sleeve and an external thread arranged on the outer wall of the bolt section of the positioning sleeve and matched with the internal thread.
The tail end of the internal thread of the positioning sleeve nut section is provided with a bulge; the initial end of the external thread of the positioning sleeve bolt section is provided with a groove matched with the protrusion, so that the threaded hole of the positioning sleeve nut section is ensured to be corresponding to the threaded hole of the impeller.
A positioning sleeve flat key is arranged on the periphery of the positioning sleeve bolt section; the impeller is positioned on the periphery of the positioning sleeve bolt section through the positioning sleeve flat key so as to ensure that the threaded hole of the positioning sleeve bolt section corresponds to the threaded hole of the impeller.
The outer wall of the pin section of the positioning sleeve is provided with a bolt; and the inner wall of the positioning sleeve bolt section is provided with a slot which is matched with the inserted pin in an inserted manner so as to ensure that a threaded hole of the positioning sleeve bolt section corresponds to a threaded hole of the positioning sleeve pin section.
The threaded holes on the two sides of the impeller are the same in number and are symmetrically distributed so as to offset the axial force generated by the threaded fasteners on the two sides of the impeller.
The number of the threaded holes on each side of the impeller is 4-8.
The positioning sleeve bolt section and the positioning sleeve nut section are both made of austenitic deep-cooled steel; the locating sleeve pin section is made of 9 nickel steel.
The invention has the beneficial effects that:
1) the impeller is fixed on the pump shaft through the locating sleeve assembly, the pump shaft does not need to be processed, and errors generated by processing are reduced.
2) The impeller and the locating sleeve assembly are fixedly connected through the threaded fasteners, and the threaded holes on the two sides of the impeller are symmetrically distributed, so that axial forces generated by the threaded fasteners on the two sides of the impeller can be mutually offset, and the impeller is guaranteed not to slide axially.
3) According to the invention, the positioning sleeve bolt section and the positioning sleeve nut section are made of austenitic deep-cooling steel, and can be connected with the pump shaft more tightly by utilizing the thermal expansion coefficients of the positioning sleeve bolt section and the positioning sleeve nut section along with the reduction of temperature; the locating sleeve pin section is made of 9 nickel steel, the thermal expansion coefficient of the locating sleeve pin section is low, the locating sleeve pin section can ensure that the locating sleeve assembly is more difficult to rotate relatively at a low temperature along with the reduction of the locating sleeve bolt section, and compared with the normal temperature, the low temperature can ensure the connection stability among all parts in the locating sleeve assembly, and the locating sleeve pin section is suitable for a low-temperature working environment.
4) The positioning sleeve flat key is arranged on the periphery of the positioning sleeve bolt section, and the impeller is installed on the periphery of the positioning sleeve bolt section through the positioning sleeve flat key, so that the position of a screw hole of the impeller is determined, and the circumferential positioning of the impeller is guaranteed; all be equipped with buckle structure between position sleeve nut section and the position sleeve bolt section, between position sleeve bolt section and the position sleeve round pin section, when each buckle structure was mutually supported, can guarantee that the screw of impeller, the screw of position sleeve nut section and the screw of position sleeve round pin section can correspond each other.
Drawings
Fig. 1 is a schematic cross-sectional structure of the present invention.
Fig. 2 is an enlarged schematic view of a portion a of fig. 1.
Fig. 3 is an enlarged schematic view of a portion B of fig. 1.
Reference numerals:
1. an inducer; 2. a bearing assembly; 3. a locating sleeve assembly; 4. a positioning sleeve flat key; 5. a bushing; 6. an impeller; 7. a guide vane; 8. a balance disc; 9. a built-in motor; 10. a rear pump housing; 11. positioning a sleeve pin section; 12. a positioning sleeve bolt segment; 13. a locating sleeve nut section; 14. a middle pump casing; 15. a pump shaft; 16. a sleeve; 17. a front-section pump housing; 18. an outer ring; 19. ribs; 20. an inner ring; 21. a bearing; 22. a last stage impeller; 23. and (4) a bolt.
Detailed Description
The following further description is made with reference to the embodiments shown in the drawings.
For convenience of description, the left end of fig. 1 is taken as the front, and the right end is taken as the back.
The LNG multistage immersed pump shown in fig. 1 includes a front-stage pump casing 17, a middle-stage pump casing 14, a rear-stage pump casing 10, a bearing assembly 2, an internal motor 9, a pump shaft 15, an inducer 1, a plurality of (five shown in the figure) impellers 6, a plurality of (four shown in the figure) guide vanes 7, and a balance disk 8, which are coaxially arranged. The front section pump shell, the middle section pump shell and the rear section pump shell are arranged sequentially from front to back and are fixedly connected with each other through bolts, an inlet is formed in the front end of the front section pump shell, and an outlet is formed in the rear end of the rear section pump shell.
As shown in fig. 1 and 3, the bearing assembly is arranged in a front-section pump shell; wherein the bearing assembly comprises a bearing support bracket, a bearing 21 and a sleeve 16; the bearing support frame comprises an inner ring 20 for fixedly mounting a bearing, an outer ring 18 fixed on the inner wall of the front-section pump shell through screws and a plurality of ribs 19 connected between the inner ring and the outer ring in a spoke shape; the sleeve is fixed in the inner ring of the bearing. The built-in motor is fixed in the rear-section pump shell. The pump shaft is horizontally arranged; the pump shaft forward end is rotatably positioned in the sleeve so as to be supported by the bearing assembly; the rear end of the pump shaft is fixedly connected with a motor shaft of the built-in motor so as to be driven by the built-in motor to rotate. The inducer is arranged in the front-section pump shell and is fixedly connected with the front end of the pump shaft. The five impellers are arranged in the middle pump shell; the peripheries of the other four impellers except the final-stage impeller 22 are all sleeved with one guide vane; be provided with bush 5 of fixing on the stator between stator and the impeller, the outer fringe and the middle section pump case inner wall of stator pass through key fixed connection for stator and middle section pump case do not have relative rotation, have relative rotation between stator and the impeller. The balance disc is installed on the pump shaft and fixed on the rear side of the last-stage impeller and used for balancing the axial force on the impeller.
The above structures are all existing structures. The improvement of the invention is that:
as shown in figure 1, each impeller is fixed on the pump shaft through a group of locating sleeve assemblies 3, machining of the pump shaft is not needed, and machining errors can be reduced. As shown in fig. 2, each set of the positioning sleeve assembly includes a positioning sleeve nut section 13, a positioning sleeve bolt section 12 and a positioning sleeve pin section 11 which are coaxially arranged. The positioning sleeve nut section, the positioning sleeve bolt section and the positioning sleeve pin section are all sleeved on the pump shaft and are sequentially and fixedly connected; the positioning sleeve bolt section is in interference fit with the pump shaft, so that the positioning sleeve bolt section is fixed on the pump shaft; the positioning sleeve bolt section is fixedly connected with the positioning sleeve nut section through a thread pair (an internal thread is arranged on the inner wall of the positioning sleeve nut section, and an external thread matched with the internal thread is arranged on the outer wall of the positioning sleeve bolt section).
The positioning sleeve nut section is fixedly connected with one side of the impeller into a whole through a threaded fastener (preferably a screw); the positioning sleeve pin section, the positioning sleeve bolt section and the other side of the impeller are fixedly connected into a whole through a threaded fastener (preferably a screw). The same number of threaded holes are symmetrically distributed on two sides of the impeller to offset axial force generated by the threaded fasteners on the two sides of the impeller, so that the impeller is ensured not to slide axially. Preferably, the number of threaded holes on each side of the impeller is 4-8 (6 in the figure).
In order to adapt to a low-temperature working environment, the positioning sleeve bolt section and the positioning sleeve nut section are made of austenitic deep-cooling steel, and along with the reduction of temperature, the positioning sleeve bolt section and the positioning sleeve nut section can be connected with the pump shaft more tightly by utilizing the thermal expansion coefficients of the positioning sleeve bolt section and the positioning sleeve nut section. The locating sleeve pin section is made of 9 nickel steel, the thermal expansion coefficient of the locating sleeve pin section is low, and the locating sleeve pin section can ensure that the locating sleeve assembly is more difficult to rotate relatively at low temperature along with the reduction of the locating sleeve bolt section. Compared with the normal temperature, the material can ensure the connection stability of all the parts in the positioning sleeve component in the low-temperature environment, thereby being better suitable for the low-temperature working environment.
In order to ensure that the screw hole of the impeller, the screw hole of the nut section of the positioning sleeve and the screw hole of the pin section of the positioning sleeve can correspond to each other in the installation process so as to facilitate the tightening of the threaded fastener, the invention adopts the following structure:
the tail end of the internal thread of the positioning sleeve nut section is provided with a bulge (not shown in the figure); the initial end of the external thread of the positioning sleeve bolt section is provided with a groove (not shown) matched with the bulge. During installation, the positioning sleeve nut section and the positioning sleeve bolt section are screwed up through the thread pair and the protrusion and the groove are matched with each other, so that the threaded hole of the positioning sleeve nut section is corresponding to the threaded hole of the impeller.
And a positioning sleeve flat key 4 is arranged on the periphery of the positioning sleeve bolt section. When the impeller is installed, the impeller is positioned at the periphery of the positioning sleeve bolt section through the positioning sleeve flat key, so that the threaded hole of the positioning sleeve bolt section can be ensured to correspond to the threaded hole of the impeller, and the impeller is circumferentially positioned.
The outer wall of the positioning sleeve pin section is provided with a bolt 23 extending forwards; and the inner wall of the bolt section of the positioning sleeve is provided with a slot which is in inserted connection with the plug pin. During installation, the bolt extends into the slot, and the threaded hole of the bolt section of the positioning sleeve can be ensured to correspond to the threaded hole of the pin section of the positioning sleeve.
Finally, it should be noted that the above-mentioned list is only a specific embodiment of the present invention. It is obvious that the present invention is not limited to the above embodiments, but many variations are possible. All modifications which can be derived or suggested by a person skilled in the art from the disclosure of the present invention are to be considered within the scope of the invention.

Claims (9)

  1. The LNG multistage immersed pump comprises a front-section pump shell (17), a middle-section pump shell (14) and a rear-section pump shell (10), a bearing assembly (2) fixed in the front-section pump shell, a built-in motor (9) fixed in the rear-section pump shell, a pump shaft (15) with one end supported by the bearing assembly and the other end fixedly connected with a motor shaft of the built-in motor, an inducer (1) arranged in the front-section pump shell and fixedly connected with the front end of the pump shaft, a plurality of impellers (6) arranged in the middle-section pump shell, a plurality of guide vanes (7) sleeved outside the impellers and fixedly connected with the inner wall of the middle-section pump shell at the outer edges, and a balance disc (8) arranged on the pump shaft and fixed at the rear side of a last-stage impeller (; the method is characterized in that:
    each impeller is fixed on the pump shaft through a group of locating sleeve assemblies (3); the locating sleeve assembly comprises a locating sleeve nut section (13), a locating sleeve bolt section (12) and a locating sleeve pin section (11), which are sleeved on the pump shaft and fixedly connected in sequence; the positioning sleeve bolt section is in interference fit with the pump shaft, so that the positioning sleeve bolt section is fixed on the pump shaft; the positioning sleeve bolt section is fixedly connected with the positioning sleeve nut section through a thread pair; the positioning sleeve nut section is fixedly connected with one side of the impeller into a whole through a threaded fastener; the positioning sleeve pin section, the positioning sleeve bolt section and the other side of the impeller are fixedly connected into a whole through a threaded fastener; the pump shaft, the positioning sleeve nut section, the positioning sleeve bolt section, the positioning sleeve pin section and the impeller are coaxially arranged.
  2. 2. The LNG multistage immersed pump according to claim 1, characterized in that: the bearing assembly comprises a bearing support frame, a bearing (21) fixed on the bearing support frame and a sleeve (16) fixed in a bearing inner ring; the pump shaft is rotatably positioned in the sleeve; the bearing support frame comprises an inner ring (20) for fixedly mounting a bearing, an outer ring (18) fixed on the inner wall of the front-end pump shell through screws and a plurality of ribs (19) connected between the inner ring and the outer ring in a spoke shape.
  3. 3. The LNG multistage immersed pump according to claim 2, characterized in that: the thread pair comprises an internal thread arranged on the inner wall of the nut section of the positioning sleeve and an external thread arranged on the outer wall of the bolt section of the positioning sleeve and matched with the internal thread.
  4. 4. The LNG multistage immersed pump according to claim 3, wherein: the tail end of the internal thread of the positioning sleeve nut section is provided with a bulge; the initial end of the external thread of the positioning sleeve bolt section is provided with a groove matched with the protrusion, so that the threaded hole of the positioning sleeve nut section is ensured to be corresponding to the threaded hole of the impeller.
  5. 5. The LNG multistage immersed pump according to claim 4, wherein: a positioning sleeve flat key (4) is arranged on the periphery of the positioning sleeve bolt section; the impeller is positioned on the periphery of the positioning sleeve bolt section through the positioning sleeve flat key so as to ensure that the threaded hole of the positioning sleeve bolt section corresponds to the threaded hole of the impeller.
  6. 6. The LNG multistage immersed pump according to claim 5, wherein: the outer wall of the pin section of the positioning sleeve is provided with a bolt (23); and the inner wall of the positioning sleeve bolt section is provided with a slot which is matched with the inserted pin in an inserted manner so as to ensure that a threaded hole of the positioning sleeve bolt section corresponds to a threaded hole of the positioning sleeve pin section.
  7. 7. The LNG multistage immersed pump according to claim 6, wherein: the threaded holes on the two sides of the impeller are the same in number and are symmetrically distributed so as to offset the axial force generated by the threaded fasteners on the two sides of the impeller.
  8. 8. The LNG multistage immersed pump according to claim 7, wherein: the number of the threaded holes on each side of the impeller is 4-8.
  9. 9. The LNG multistage immersed pump according to claim 8, characterized in that: the positioning sleeve bolt section and the positioning sleeve nut section are both made of austenitic deep-cooled steel; the locating sleeve pin section is made of 9 nickel steel.
CN202010512032.5A 2020-06-08 2020-06-08 LNG multistage immersed pump Pending CN111648978A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010512032.5A CN111648978A (en) 2020-06-08 2020-06-08 LNG multistage immersed pump

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010512032.5A CN111648978A (en) 2020-06-08 2020-06-08 LNG multistage immersed pump

Publications (1)

Publication Number Publication Date
CN111648978A true CN111648978A (en) 2020-09-11

Family

ID=72350464

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010512032.5A Pending CN111648978A (en) 2020-06-08 2020-06-08 LNG multistage immersed pump

Country Status (1)

Country Link
CN (1) CN111648978A (en)

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