CN110685918A

CN110685918A - Multiphase mixed transportation pump

Info

Publication number: CN110685918A
Application number: CN201910989981.XA
Authority: CN
Inventors: 陈道毅; 黄书才; 李磊
Original assignee: Shenzhen International Graduate School of Tsinghua University
Current assignee: Shenzhen International Graduate School of Tsinghua University
Priority date: 2019-10-17
Filing date: 2019-10-17
Publication date: 2020-01-14

Abstract

A multiphase mixed transportation pump comprises a pump shaft, a water inlet section, a pump body middle section and a water outlet section, wherein the pump shaft is rotatably inserted into the water outlet section, the pump body middle section and the water inlet section from top to bottom in sequence; the pump body middle section comprises a plurality of middle section shells and a plurality of impellers, the middle section shells are sleeved outside the pump shaft, and the bottom of the middle section shell positioned at the lowest part is communicated with the top of the water inlet section shell in a sealing manner; the water outlet section comprises a water outlet section shell and a second flange, the second flange is arranged on the water outlet section shell and communicated with the water outlet section shell, the bottom of the water outlet section shell is communicated with the top of the middle section shell positioned at the top in a sealing mode, and the middle section of the pump body is arranged between the water inlet section shell and the water outlet section shell. The multiphase pump provided by the embodiment of the application has the advantages of simple structure, low production cost and long service life.

Description

Multiphase mixed transportation pump

Technical Field

The application relates to the technical field of multistage axial-flow pumps, in particular to a multiphase mixed delivery pump.

Background

During the exploitation of an oil field, oil, gas, water and other impurities are symbiotic and are typically separated from the gas phase and transported by pumps and compressors, respectively. This requires a gas-liquid separation device, a pump, a compressor train and two lines at each wellhead. However, the cost of such a configuration is very high, especially in offshore fields.

As a new technology, each well head only needs one unit and one pipeline, and compared with the traditional gas-liquid two-phase respective transmission system, the multiphase mixed transmission system has the advantages of simple structure, convenience in operation, easiness in control and the like. In addition, only one pipeline is needed in the multiphase mixed transportation system, so that a separator, an air compressor, an oil transportation pump, a natural gas emptying and torch system and two independent gas-liquid transportation pipelines can be avoided, the mining cost and the management cost are greatly reduced, and the multiphase mixed transportation system has a wide application prospect.

The multiphase mixed transportation pump is the most key core equipment for realizing the advanced gas-liquid mixed transportation process, has the dual characteristics of a pump and a compressor, and is a common problem in the world pump industry. However, the multiphase pump in the prior art has a complex structure, high design and manufacturing costs, and a short service life.

Disclosure of Invention

In view of the above, there is a need for a multiphase pump with simple structure, low production cost and prolonged service life.

The application provides a multiphase pump, which comprises a pump shaft, a water inlet section, a pump body middle section and a water outlet section, wherein the pump shaft is sequentially and rotatably inserted into the water outlet section, the pump body middle section and the water inlet section from top to bottom; the pump body middle section comprises a plurality of middle section shells and a plurality of impellers, the middle section shells are sequentially sleeved outside the pump shaft from top to bottom, every two adjacent middle section shells are hermetically communicated, the bottom of the middle section shell positioned at the lowest position is hermetically communicated with the top of the water inlet section shell, and each impeller is fixedly sleeved on the pump shaft; and the play water section includes a water section shell, a second flange and a second bearing, the second bearing cover is established the top of pump shaft, the second flange set up in go out on the water section shell and with go out water section shell intercommunication, go out the bottom of water section shell and be located the top the sealed intercommunication in top of middle section shell, the pump body middle section set up in intake the section shell with go out between the water section shell.

As a preferred scheme, the top of the water inlet section shell is provided with a first gland, the bottom of the water outlet section shell is provided with a second gland, and the first gland is connected with the second gland through a plurality of studs.

As a preferred scheme, pump body middle section still includes a plurality of stator and a plurality of stator axle sleeve, the quantity of a plurality of stator with the same and the one-to-one of a plurality of stator axle sleeves.

As a preferable scheme, each guide vane is sleeved on the pump shaft through the guide vane shaft sleeve.

Preferably, the guide vane is arranged between every two adjacent impellers.

As a preferred scheme, the water inlet section shell is provided with a first through hole butted with the first bearing, and the water outlet section shell is provided with a second through hole butted with the second bearing.

As a preferable scheme, the multiphase pump further comprises a balance pipe, and two ends of the balance pipe are respectively communicated with the first through hole and the second through hole.

As a preferred scheme, the multiphase pump further comprises a magnetic coupling, and the magnetic coupling is connected with the top end of the pump shaft.

As a preferred scheme, sealing grooves are respectively arranged at the top of the water inlet section shell, the top of the middle section shell and the top of the water outlet section shell.

As a preferable scheme, a sealing ring is arranged in each sealing groove.

The multiphase mixed transportation pump provided by the embodiment of the application is characterized in that the first bearing and the second bearing at the two ends of the pump shaft are communicated through the balance pipe, so that the axial force can be balanced, the conveying medium can be fully utilized for lubrication and cooling, and an external cooling pump station is not needed. In addition, the magnetic force is adopted for driving, the sealing effect under the high-pressure environment can be ensured, mechanical sealing and a matched cooling device are not needed, the structure is compact, and the leakage risk is avoided. Therefore, the multiphase mixing pump provided by the embodiment of the application has the advantages of simple structure, low production cost and capability of prolonging the service life.

Drawings

Fig. 1 is a schematic view of a multiphase pump according to an embodiment of the present application.

Fig. 2 is a cross-sectional view of fig. 1 taken along line II-II.

Fig. 3 is an exploded view of a multiphase pump according to an embodiment of the present application.

Fig. 4 is a schematic view of the guide vane in fig. 3.

Fig. 5 is a schematic view of the mid-section housing of fig. 3.

Fig. 6 is a schematic view of the first gland of fig. 3.

Figure 7 is a schematic view of the second gland of figure 3.

Description of the main elements

Multiphase mixed transportation pump 100

Pump shaft 10

Water inlet section 20

Water inlet section shell 21

First gland 211

Second key groove 212

First fixing hole 213

Water inlet channel 214

First flange 22

First fastener 221

Water inlet 222

First bearing 23

First shaft sleeve 24

First through hole 25

Fixing nut 26

Pump body middle section 30

Middle shell 31

Fourth key slot 311

Impeller 32

Guide vane 33

First key groove 331

Guide vane key 332

Vane hub 34

Water outlet section 40

Water outlet section shell 41

Second gland 411

Third key groove 412

Second fixing hole 413

Water outlet passage 414

Second flange 42

Second fastening member 421

Water outlet 422

Second bearing 43

Second shaft sleeve 44

Second through hole 45

Stud 50

Balance tube 60

Magnetic coupling 70

End cap 80

Sealing ring 90

The following detailed description will explain the present application in further detail in conjunction with the above-described figures.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application.

All other embodiments that can be obtained by a person skilled in the art without inventive step based on the embodiments in this application are within the scope of protection of this application.

Referring to fig. 1 to 3, a multiphase pump 100 is provided according to an embodiment of the present disclosure. The multiphase pump 100 can include a pump shaft 10, a water inlet section 20, a pump body middle section 30, and a water outlet section 40.

The pump shaft 10 is rotatably inserted into the water outlet section 40, the pump body middle section 30 and the water inlet section 20 from top to bottom in sequence.

In this embodiment, the water inlet section 20 may include a water inlet section housing 21, a first flange 22 and a first bearing 23. The water inlet section shell 21 is sleeved outside the pump shaft 10, and the first bearing 23 is sleeved at the bottom of the pump shaft 10.

Specifically, the water inlet section 20 further includes a first shaft sleeve 24, the first shaft sleeve 24 is fixedly sleeved on the pump shaft 10, and the first bearing 23 is sleeved at the bottom of the pump shaft 10 through the first shaft sleeve 24.

The first flange 22 is fixedly arranged on the water inlet section shell 21, and the first flange 22 is communicated with the water inlet section shell 21. Specifically, the water inlet section housing 21 is provided with a first fixing hole 213, and four edges of the first flange 22 are respectively provided with a first connecting hole (not shown), so that the first flange 22 can be fixed on the water inlet section housing 21 by fastening a first fastening member 221 through the first connecting hole to fasten in the first fixing hole 213 of the water inlet section housing 21.

In this embodiment, the water inlet section casing 21 is further provided with a water inlet passage 214, and the water inlet 222 of the first flange 22 is butted with the water inlet passage 214 of the water inlet section casing 21. Therefore, when the multiphase pump works, the working medium can enter a water suction chamber (not shown) in the water inlet section shell 21 through the water inlet 222 and the water inlet channel 214.

In this embodiment, the pump body middle section 30 may include a plurality of middle section casings 31 and a plurality of impellers 32. The plurality of middle section shells 31 are sequentially sleeved outside the pump shaft 10 from top to bottom. Each impeller 32 is fixedly sleeved on the pump shaft 10, and the plurality of impellers 32 can rotate along with the rotation of the pump shaft 10. In this embodiment, every two adjacent middle section shells 31 are in sealed communication, and the bottom of the middle section shell 31 located at the lowest position is in sealed communication with the top of the water inlet section shell 21.

In this embodiment, the water outlet section 40 includes a water outlet section housing 41, a second flange 42 and a second bearing 43. The water outlet section shell 41 is sleeved outside the pump shaft 10, and the second bearing 43 is sleeved on the top of the pump shaft 10. Specifically, the water outlet section 40 further includes a second shaft sleeve 44, the second shaft sleeve 44 is fixedly sleeved on the pump shaft 10, and the second bearing 43 is sleeved on the top of the pump shaft 10 through the second shaft sleeve 44.

The second flange 42 is disposed on the water outlet section housing 41 and is communicated with the water outlet section housing 41. Specifically, the outlet section shell 41 is provided with a second fixing hole 413, and four edges of the second flange 42 are respectively provided with a second connecting hole (not shown), so that the second flange 42 can be fixed on the outlet section shell 41 by passing a second fastening member 421 through the second connecting hole to be fastened in the second fixing hole 413 on the outlet section shell 41.

In this embodiment, the water outlet section casing 41 is further provided with a water outlet passage 414, and the water outlet 422 of the second flange 42 is butted with the water outlet passage 414 of the water outlet section casing 41. Therefore, when the multiphase pump is in operation, the working medium in the pressurized water chamber in the water outlet section housing 41 can be discharged through the water outlet 422 and the water outlet passage 414.

Further, the bottom of the water outlet section housing 41 is in sealed communication with the top of the uppermost middle section housing 31, and the pump body middle section 30 is disposed between the water inlet section housing 21 and the water outlet section housing 41.

When the multiphase pump works, the working medium enters the water suction chamber in the water inlet section shell 21 through the water inlet 222 and the water inlet channel, and then is pressurized by the impellers 32 in the pump body middle section 30 by centrifugal force and then is pumped upwards, so that the working medium enters the pressurized water chamber in the water outlet section shell 41 and is discharged out of the pressurized water chamber in the water outlet section shell 41 through the water outlet 422 and the water outlet channel to finish pumping. The multiphase pump 100 provided by the embodiment of the present application mainly includes a water inlet section 20, a pump body middle section 30 and a water outlet section 40, and has a simple structure, so that the cost of the multiphase pump is low.

Specifically, the top of the water inlet section shell 21 is provided with a first gland 211, the bottom of the water outlet section shell 41 is provided with a second gland 411, and the first gland 211 is fixedly connected with the second gland 411 through a plurality of studs 50. Wherein a plurality of studs 50 are arranged around the circumference of the pump shaft 10, and the first gland 211 and the second gland 411 provide installation spaces for the studs 50. Under the cooperation of the first gland 211, the second gland 411 and the stud 50, an axial force is provided to each of the middle-stage housings 31, so that the plurality of middle-stage housings 31 are clamped together to perform a sealing function.

In a preferred embodiment, the pump body middle section 30 further includes a plurality of guide vanes 33 and a plurality of guide vane bushings 34, and the number of the plurality of guide vanes 33 is the same as the number of the plurality of guide vane bushings 34 and corresponds to one.

The guide vane shaft sleeve 34 is fixedly sleeved on the pump shaft 10. Each guide vane 33 is sleeved on the pump shaft 10 through the guide vane shaft sleeve 34. A gap (not shown) is provided between each guide vane 33 and the guide vane shaft sleeve 34, and the length of the gap is adjusted according to the flow rate of the working medium.

In a preferred embodiment, the guide vanes 33 are arranged between every two adjacent impellers 32, so that the purpose of limiting the axial displacement of the guide vanes 33 is achieved. Wherein the plurality of guide vanes 33 are used for flow stabilization of the working medium.

In the present embodiment, a balance hole is formed in each of the impellers 32 and the hubs of each of the guide vanes 33 for balancing the axial force, so as to increase the service life of the bearing and further improve the service life of the entire pump.

Referring to fig. 4 to 7, a first key slot 331 is formed on the outer circumferential wall of each guide vane 33, and a guide vane key 332 is formed in the first key slot 331 of each guide vane 33.

The inner peripheral wall of the first gland 211 is provided with a second key groove 212, the inner peripheral wall of the second gland 411 is provided with a third key groove 412, and the inner peripheral wall of the middle section shell 31 is provided with a fourth key groove 311.

Wherein, the guide vane 33 located at the uppermost position is installed in the third key groove 412 of the inner peripheral wall of the second gland 411 through the guide vane key 332, the guide vane 33 located at the lowermost position is installed in the second key groove 212 of the inner peripheral wall of the first gland 211 through the guide vane key 332, and the guide vane 33 located at the middle section is installed in the fourth key groove 311 of the inner peripheral wall of the middle section housing 31 through the guide vane key 332. Thereby, the purpose of limiting the radial displacement of the plurality of guide vanes 33 can be achieved.

Referring to fig. 2 and 3 again, the water inlet section shell 21 is provided with a first through hole 25 in butt joint with the first bearing 23, and the water outlet section shell 41 is provided with a second through hole 45 in butt joint with the second bearing 43.

The multiphase pump 100 may further include a balance pipe 60, and two ends of the balance pipe 60 are respectively communicated with the first through hole 25 and the second through hole 45. Therefore, the first bearings and the second bearings at the two ends of the pump shaft 10 are communicated through the balance pipe 60, so that high-pressure fluid of the pressurized-water chamber in the water outlet section 40 can enter the first bearing of the water suction chamber in the water inlet section 20, axial force can be balanced, conveying media can be fully utilized for lubrication and cooling, and an external cooling pump station is not needed.

Referring to fig. 1 again, the multiphase pump 100 may further include a magnetic coupling 70, and the magnetic coupling 70 is connected to the top end of the pump shaft 10. In the embodiment, the magnetic coupling adopts a cylindrical structure and comprises an outer magnetic cylinder, an outer magnetic block, an inner magnetic cylinder, an inner magnetic block and an isolation sleeve, and the magnetic coupling is compact in radial size, high in transmission efficiency and good in stability. In the embodiment of the present application, the multiphase pump 100 is driven by magnetic force, and completely isolates a driving device such as a motor or a turbine from a pump head, so that a sealing effect under a high-pressure environment can be ensured, a mechanical seal and a matching cooling device are not required, the structure is compact, and no leakage risk exists.

In a preferred embodiment, the water inlet section 20 may further include an end cap 80, and the end cap 80 is hermetically connected to the bottom of the water inlet section housing 21. A retaining nut 26 is also provided between the first sleeve 24 and the end cap 80. The retaining nut 26 is used to limit component displacement on the pump shaft 10.

Sealing grooves are respectively arranged at the top of the water inlet section shell 21, the top of the middle section shell 31 and the top of the water outlet section shell 41.

The top of the end cover 80, the top of the first gland 211 and the top of the second gland 411 are all provided with sealing grooves.

In a preferred embodiment, a sealing ring 90 is disposed in each sealing groove, thereby further increasing the sealing performance of the multiphase pump 100. Therefore, the joints between the parts are sealed by the sealing rings, and the leakage of media under working pressure can be guaranteed.

It will be evident to those skilled in the art that the present application is not limited to the details of the foregoing illustrative embodiments, and that the present application may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims

1. The utility model provides a heterogeneous defeated pump that mixes, heterogeneous defeated pump that mixes includes the pump shaft, the section of intaking, pump body middle section and goes out the water section, the pump shaft from top to bottom rotationally inserts and establishes in order go out water section, pump body middle section and the section of intaking, its characterized in that:

the water inlet section comprises a water inlet section shell, a first flange and a first bearing, the water inlet section shell is sleeved outside the pump shaft, the first bearing is sleeved at the bottom of the pump shaft, and the first flange is arranged on the water inlet section shell and communicated with the water inlet section shell;

the pump body middle section comprises a plurality of middle section shells and a plurality of impellers, the middle section shells are sequentially sleeved outside the pump shaft from top to bottom, every two adjacent middle section shells are hermetically communicated, the bottom of the middle section shell positioned at the lowest position is hermetically communicated with the top of the water inlet section shell, and each impeller is fixedly sleeved on the pump shaft; and

go out the water section including a water section shell, second flange and second bearing, the second bearing cover is established the top of pump shaft, the second flange set up in go out on the water section shell and with go out water section shell intercommunication, go out the bottom of water section shell and be located the top the sealed intercommunication in top of middle section shell, pump body middle section set up in intake the section shell with go out between the water section shell.

2. The multiphase pump according to claim 1, wherein a first gland is arranged at the top of the water inlet section shell, a second gland is arranged at the bottom of the water outlet section shell, and the first gland and the second gland are connected through a plurality of studs.

3. The multiphase pump according to claim 1, wherein the pump body middle section further comprises a plurality of guide vanes and a plurality of guide vane shaft sleeves, and the number of the plurality of guide vanes is the same as the number of the plurality of guide vane shaft sleeves and corresponds to one another.

4. The multiphase pump according to claim 3, wherein each of the guide vanes is sleeved on the pump shaft through the guide vane shaft sleeve.

5. The multiphase pump of claim 4, wherein said guide vanes are disposed between each adjacent two of said impellers.

6. The multiphase pump according to claim 1, wherein the water inlet section housing is provided with a first through hole abutting against the first bearing, and the water outlet section housing is provided with a second through hole abutting against the second bearing.

7. The multiphase pump according to claim 6, further comprising a balance pipe, wherein two ends of the balance pipe are respectively communicated with the first through hole and the second through hole.

8. The multiphase pump of claim 1, further comprising a magnetic coupling coupled to a top end of the pump shaft.

9. The multiphase pump according to claim 1, wherein seal grooves are respectively formed in the top of the water inlet section casing, the top of the middle section casing and the top of the water outlet section casing.

10. The multiphase pump of claim 1, wherein a seal ring is disposed in each of the seal grooves.