CN209557261U - A kind of adjustment device of sectional type multi-stage pump - Google Patents
A kind of adjustment device of sectional type multi-stage pump Download PDFInfo
- Publication number
- CN209557261U CN209557261U CN201822031968.7U CN201822031968U CN209557261U CN 209557261 U CN209557261 U CN 209557261U CN 201822031968 U CN201822031968 U CN 201822031968U CN 209557261 U CN209557261 U CN 209557261U
- Authority
- CN
- China
- Prior art keywords
- balancing drum
- pump
- impeller
- stage
- pressure
- 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.)
- Active
Links
Landscapes
- Control Of Non-Positive-Displacement Pumps (AREA)
Abstract
The utility model discloses a kind of adjustment device of sectional type multi-stage pump.The sectional type multi-stage pump of the utility model, including by the perforative suction casing of pump shaft, middle section, discharge section, the pump shaft is socketed with first stage impeller in suction casing, pump shaft is socketed with middle section impeller, pump shaft in middle section and is socketed with impeller in discharge section, and balancing drum high-voltage end and balancing drum low-pressure end are provided on the balancing drum；First pressure sensor is installed, balancing drum low-pressure end installs second pressure sensor on the balancing drum high-voltage end.The sectional multistage pump configuration of the utility model is simple, and design is reasonable；PLC regulator control system is mounted on outside the pump housing, convenient for pump user during pump operation current events observation multi-stage pump axial force situation of change and balancing drum axial force balance ability；The reversed setoff work of balancing drum mechanism is automatically adjusted by PLC；It prevents balancing drum gap from blocking, improves the service life of balancing drum；The cavitation resistive property of first stage impeller is improved, the cover board power of first stage impeller front shroud is reduced.
Description
Technical field
The utility model relates to a kind of sectional multistage pump technical fields, more particularly to are transporting to sectional multi-stage centrifugal pump
The method that auto-alignment is regulated and controled to power when axial force changes among row process, specifically a kind of sectional type are more
The adjustment device of grade pump.
Background technique
Sectional type multi-stage pump is widely used in many fields such as petroleum, chemical industry, machinery, mine, light industry, medicine and food.
And axial force is that centrifugal multistage pump multiple centrifugal pump breaks down and influences the key factor in its service life.Balancing drum is that sectional type multi-stage pump is most simple
Single, most common axial thrust balancing devices, balancing drum it is compact-sized, it is stable etc. due to, it is extensive in multistage pump
It uses.
Balancing drum is mounted on after impeller, and one end is connected with pump chamber after impeller, the other end by balance pipe with
Suction chamber low-pressure fluid is connected, and pressure difference is formed in balancing drum front and rear surfaces, thus the axis generated in balanced multistage pump operation process
Xiang Li.But during pump operation, seal clearance and balance before and after impeller are caused due to pumped (conveying) medium is there are impurity etc.
Drum gap increases and operating condition deviates the factors such as design conditions and causes axial force change larger, balancing drum balancing axial thrust
Ability is affected；If balancing drum axial force cannot change with multistage pump operating condition, following two can be generated
Situation:
When balancing drum balancing axial thrust is excessive, " mistake victory axial force " contrary with impeller inlet is generated；
On the contrary, then causing " residual axial force " identical with impeller inlet direction when balancing drum balancing axial thrust is too small；It is residual
Remaining axial force is the main reason for causing bearing failure, and still, the continuous variation in axial force direction suffered by bearing can also accelerate axis
Deformation is held, the service life of bearing is shortened, to influence the safe long-term operation of multistage pump.
Summary of the invention
The purpose of this utility model is that proposing a kind of adjustment device of sectional type multi-stage pump.
To achieve the above object, the adjustment device of a kind of sectional type multi-stage pump described in the utility model, including sucking
Section, middle section, discharge section, three are fastened by flange, and the suction casing, middle section, discharge section are run through by pump shaft, and the pump shaft is being inhaled
Enter section and be socketed with first stage impeller, pump shaft is socketed with middle section impeller, pump shaft in middle section and is socketed with impeller in discharge section, it is described in
The circular passage composition that the middle section Duan Youyu impeller is close together, the pump shaft are equipped with balancing drum at the discharge section,
It is characterized in that: being provided with balancing drum high-voltage end and balancing drum low-pressure end on the balancing drum；It is installed on the balancing drum high-voltage end
First pressure sensor, balancing drum low-pressure end install second pressure sensor.
The suction casing includes pump chamber before first stage impeller, suction chamber, first stage impeller；The suction chamber one is sequentially connected chopped-off head
Pump chamber, first stage impeller before impeller.
The impeller connects thrust bearing, upper cover plate is equipped on thrust bearing, between thrust bearing and upper cover plate
Gap be thrust bearing gap.
Front shroud is installed, front shroud connection decompression racemization pipe, it is flat that decompression racemization pipe passes through connection on the first stage impeller
Weighing apparatus pipe is connected to balancing drum low-pressure end, and proportional flow control valve is equipped on balance pipe.
Temperature sensor is installed on the upper cover plate of the thrust bearing.
The first pressure sensor, second pressure sensor, temperature sensor, proportional flow control valve are connected to PLC
Regulator control system；There is balancing drum gap between balancing drum and balancing drum high-voltage end.
A kind of adjustment method of sectional type multi-stage pump described in the utility model realizes that steps are as follows:
1) second in the first pressure sensor and balancing drum low-pressure end on balancing drum high-voltage end when measuring initial
The pressure difference of pressure sensor；First pressure sensor institute's measuring pressure is p1, second pressure sensor institute's measuring pressure is p2；Pressure difference
It is worth Δ p=p1-p2；The temperature of thrust bearing gap oil temperature when measuring initial, i.e. T；
2) in the first pressure sensor and balancing drum low-pressure end on balancing drum high-voltage end when measuring working condition
The pressure difference of second pressure sensor；First pressure sensor institute's measuring pressure is p'2, second pressure sensor institute's measuring pressure is p
'1；Pressure difference is Δ p'=p'2-p1'；The temperature of thrust bearing gap oil temperature when measuring working condition, i.e. T'；
3) as the pressure difference signal Δ p'> Δ p that PLC regulator control system receives, Δ T is temperature rise, when T'> T+ Δ T, explanation
Balancing drum balancing axial thrust is greater than the axial force that multistage pump generates, and " crossing victory axial force " occurs, PLC regulator control system issues electric signal
Reduce proportional flow control valve, increase 8 pressure of balancing drum low-pressure end, until valve stops variation when T'=T；
4) as pressure difference signal Δ p'< Δ p, the T'> T+ Δ T that PLC regulator control system receives, Δ T is temperature rise, is illustrated flat
Weigh drum longitudinal balance reduced capability, but the axial force that multistage pump generates increases accordingly, and PLC regulator control system issues signal and increases at this time
Proportional flow control valve makes 8 pressure reduction of balancing drum low-pressure end, until valve stops variation when T'=T；
5) as the pressure difference signal Δ p'> Δ p that PLC regulator control system receives, Δ T is temperature rise, is set as T=5 ° of Δ, T'
When > T+ Δ T, and by adjusting proportional flow control valve so that temperature can not be changed, illustrates that balancing drum gap blocks, hard stop is answered to examine
It looks into.
T=5 ° of the Δ.
The Δ T can be adjusted according to demand.
A kind of adjustment device of sectional type multi-stage pump described in the utility model, the beneficial effect is that:
1, structure is simple, and design is reasonable；
2, the executing agency of regulation device and monitoring device are mounted on outside the pump housing clearly and easily position, are convenient for
The user of pump current events observation multi-stage pump axial force situation of change and balancing drum axial force balance ability during pump operation；
3, the reversed setoff work of balancing drum mechanism is automatically adjusted by PLC；
4, it prevents balancing drum gap from blocking, improves the service life of balancing drum；
5, the cavitation resistive property of first stage impeller is improved, the cover board power of first stage impeller front shroud is reduced.
Detailed description of the invention
Fig. 1 is the main view diagram of the utility model；
Fig. 2 is the balancing drum and its pressure difference mechanism for monitoring position view of the utility model；
Fig. 3 is the thrust bearing and temperature monitoring mechanism position schematic diagram of the utility model；
Fig. 4 is chopped-off head front shroud of impeller decompression decompression racemization pipe position view；
In figure: 1- suction chamber, 2- first stage impeller, the middle section 3- impeller, 4- impeller, 5- balancing drum, 6- balancing drum high pressure
End, 7- first pressure sensor, 8- balancing drum low-pressure end, 9- second pressure sensor, 10- thrust bearing, 11- upper cover plate,
12- thrust bearing gap, 13- temperature sensor, 14- balance pipe, 15- proportional flow control valve, 16- depressurize racemization pipe, 17- front cover
Plate, 18-PLC regulator control system, 19- balancing drum gap.
Specific embodiment
Embodiment 1
As shown in Figure 1,2,3, 4, the adjustment device of a kind of sectional type multi-stage pump described in the utility model, including sucking
Section, middle section, discharge section, three are fastened by flange, and the suction casing, middle section, discharge section are run through by pump shaft, and the pump shaft is being inhaled
Enter section and be socketed with first stage impeller 2, pump shaft is socketed with middle section impeller 3, pump shaft in middle section and is socketed with impeller 4, institute in discharge section
It states middle section to be made of the circular passage being close together with middle section impeller 3, the pump shaft is equipped with balance at the discharge section
Drum 5, it is characterised in that: be provided with balancing drum high-voltage end 6 and balancing drum low-pressure end 8 on the balancing drum 5；The balancing drum high pressure
First pressure sensor 7 is installed, balancing drum low-pressure end 8 installs second pressure sensor 9 on end 6.
The suction casing includes pump chamber before first stage impeller 2, suction chamber 1, first stage impeller；The suction chamber 1 is sequentially connected head
Pump chamber, first stage impeller 2 before grade impeller.
The impeller 4 connects thrust bearing 10, is equipped with upper cover plate 11 on thrust bearing 10, thrust bearing 10 with it is upper
Gap between cover board 11 is thrust bearing gap 12.
Front shroud 17, the connection decompression racemization pipe 16 of front shroud 17 are installed, decompression racemization pipe 16 leads on the first stage impeller 2
It crosses connection balance pipe 14 and is connected to balancing drum low-pressure end 8, and proportional flow control valve 15 is installed on balance pipe 14.
Temperature sensor 13 is installed on the upper cover plate 11 of the thrust bearing 10.
The first pressure sensor 7, second pressure sensor 9, temperature sensor 13, proportional flow control valve 15 connect respectively
It is connected to PLC regulator control system 18；There is balancing drum gap 19 between balancing drum 5 and balancing drum high-voltage end 6.
The adjustment method of a kind of sectional type multi-stage pump, it is characterised in that: realize that steps are as follows:
1) in the first pressure sensor 7 and balancing drum low-pressure end 8 on balancing drum high-voltage end 6 when measuring initial
The pressure difference of second pressure sensor 9；7 measuring pressures of first pressure sensor are p1, 9 measuring pressures of second pressure sensor are
p2；Pressure difference Δ p=p1-p2；The temperature of 12 oil temperature of thrust bearing gap when measuring initial, i.e. T；
2) in the first pressure sensor 7 and balancing drum low-pressure end 8 on balancing drum high-voltage end 6 when measuring working condition
Second pressure sensor 9 pressure difference；7 measuring pressures of first pressure sensor are p'2, second pressure sensor 9 surveys pressure
Power is p'1；Pressure difference is Δ p'=p'2-p1'；The temperature of 12 oil temperature of thrust bearing gap when measuring working condition, i.e. T'；
3) as the pressure difference signal Δ p'> Δ p that PLC regulator control system 18 receives, Δ T is temperature rise, when T'> T+ Δ T,
Illustrate that 5 balancing axial thrust of balancing drum is greater than the axial force that multistage pump generates, " crossing victory axial force " occurs, PLC regulator control system 18 is sent out
Electric signal reduces proportional flow control valve 15 out, increase 8 pressure of balancing drum low-pressure end, until valve stops variation when T'=T；
4) as pressure difference signal Δ p'< Δ p, the T'> T+ Δ T that PLC regulator control system 18 receives, Δ T is temperature rise, Δ T
=5 °, illustrate 5 longitudinal balance reduced capability of balancing drum, but the axial force that multistage pump generates increases accordingly, at this time PLC regulator control system
18 issue signal scaling up flow valve 15, make 8 pressure reduction of balancing drum low-pressure end, until valve stops variation when T'=T；
5) as the pressure difference signal Δ p'> Δ p that PLC regulator control system 18 receives, Δ T is temperature rise, is set as T=5 ° of Δ, T'
When > T+ Δ T, and by adjusting proportional flow control valve 15 so that temperature can not be changed, illustrates that balancing drum gap 19 blocks, should stop immediately
Machine check.
Pump chamber enters first stage impeller before liquid enters first stage impeller by suction chamber, passes through the energy of impeller middle section liquid
Constantly increasing, finally reach impeller, can all generate a certain size axial force due to passing through every grade of impeller, series is more,
Axial force is bigger, it is necessary to and it is elongated by balancing drum come balancing axial thrust, and with operating condition and the cycle of operation, caused by impeller
Axial force is continually changing.
It is likely to occur following several situations:
First: axial force caused by impeller is greater than the axial force of balancing drum balance, and the direction of axial force is along suction chamber side
To；
Second: axial force caused by impeller is less than balancing drum balancing axial thrust, and the direction of axial force is along thrust bearing side
To this continually changing power is bearing deformation major cause of failure.
Monitoring method: installing first pressure sensor 7 by the balancing drum high-voltage end 6 of balancing drum 5 first, (institute's measuring pressure is
p1) and balancing drum low-pressure end 8 install second pressure sensor 9 (institute's measuring pressure be p2) pressure difference (Δ p=p1-p2) monitor
Axial force illustrates that balancing drum gap 19 becomes larger when Δ p becomes smaller, and 5 axial capacity of balancing drum weakens；On the contrary, being said when Δ p is larger
Bright 5 axial capacity of balancing drum is good, or generates abnormal factors, and balancing drum gap 19 blocks, so single flat to monitor in terms of pressure difference
Weighing apparatus drum 5 axial force capacity of water of balance are unreasonable.
When balancing drum 5 can not balance the axial force of impeller generation, extra axial force is born by thrust bearing 10,
When 10 roller movement of thrust bearing, can make in the surrounding liquid oil temperature in thrust bearing gap 12 with surrounding solid friction
It rises.
There are two types of possible for oil temperature rising at thrust bearing gap 12:
First: the direction of thrust bearing endurance illustrates that balancing drum balancing axial thrust is less than impeller along thrust bearing direction
Generated axial force needs the pressure for reducing balancing drum low-pressure end 8 at this time, increases balancing drum pressure at two ends difference；
Second: the direction of 10 stress of thrust bearing illustrates that balancing drum balancing axial thrust is greater than impeller institute along 1 direction of suction chamber
The axial force of generation needs the pressure for increasing balancing drum low-pressure end 8 at this time, reduces balancing drum pressure at two ends.In addition to this, when only
Oil temperature at thrust bearing gap 12 is constant, and balancing drum gap pressure difference increase, and by increase balancing drum low-pressure end 8 pressure without
Method changes pressure difference, illustrates that balancing drum gap 19 blocks, needs hard stop inspection.
The method of adjustment drum low-pressure end 8:
Since balancing drum low-voltage tube 8 is connect by balance pipe 14 with racemization pipe 16 with the front shroud 17 of first stage impeller 2, balancing
Proportion of installation flow valve 15 on pipe 14, when proportional flow control valve is opened it is big when, 8 pressure of balancing drum low-pressure end reduce, two side pressure of balancing drum
Poor Δ p increases, the enhancing of axial force balance ability；When proportional flow control valve is opened it is small when, balancing drum low pressure end pressure increase, balancing drum two
Pressure differential deltap p is held to reduce, axial force balance reduced capability.
The front cover sheet separation that the high-pressure fluid of the balance pipe 14 of the utility model passes through decompression racemization pipe 16 and first stage impeller 2
17 low-pressure fluid is connected, and this design not only effectively prevent causing cavitation with what suction chamber 1 was connected, also contributes to
Weaken the eddy flow in 17 gap of front shroud of first stage impeller 2, reduces the cover board power of front shroud 17.
Embodiment 2
As shown in Figure 1,2,3, 4, the adjustment device of a kind of sectional type multi-stage pump described in the utility model, structure is the same as real
Apply example 1；The size for automatically adjusting balancing drum axial force, by pressure difference signal (Δ p) and the thrust bearing 10 at 5 both ends of balancing drum
Oil temperature signal T inputs to PLC regulator control system 18, and the size of 15 aperture of proportional flow control valve is judged by PLC regulator control system 18.
The control of the 18 comparative example flow valve 15 of PLC regulator control system of the utility model is by temperature and pressure double control
, specific control mode is as follows:
1, it under design discharge, is put down to (balancing drum gap the is not worn at this time) two sides of balancing drum 5 used are newly designed
The first pressure sensor 7 of drum high-voltage end 6 that weighs and the pressure difference of the second pressure sensor 9 of balancing drum low-pressure end 8 are recorded,
Pressure difference is Δ p=p2-p1(wherein p2The pressure difference measured for the first pressure sensor 7 of balancing drum high-voltage end 6；p1For balance
The pressure difference that the second pressure sensor 9 of drum low-pressure end 8 measures)；And the oil temperature of 11 gap location of upper cover plate of thrust bearing 10 is recorded,
That is T；
2, when the pressure difference signal that PLC regulator control system 18 receives is Δ p'=p'2-p1' (wherein p'2For balancing drum high-voltage end
The pressure difference that 6 first pressure sensor 7 measures；p′1The pressure difference measured for the second pressure sensor 9 of balancing drum low-pressure end 8),
(wherein T' is the upper cover of thrust bearing 10 under operating condition variation or long period state to the temperature signal that Δ p'> Δ p and PLC are received
The oil temperature of 11 gap location of plate；T is the oil temperature of 11 gap location of upper cover plate of thrust bearing 10 under design conditions；Δ T is temperature rise, if
It is T=5 ° of Δ, additionally it is possible to which it is more to illustrate that 5 balancing axial thrust of balancing drum is greater than when voluntarily adjusting T'> T+ Δ T according to demand
There is " crossing victory axial force " in the axial force that grade pump generates, at this point, PLC regulator control system 18, which issues electric signal, reduces proportional flow control valve
15, increase 8 pressure of balancing drum low-pressure end, until valve stops variation when T'=T；
3, as the temperature signal T'> T that pressure difference signal Δ p'< Δ p and PLC that PLC regulator control system 18 receives are received
When+Δ T, illustrate 5 longitudinal balance reduced capability of balancing drum, but the axial force that multistage pump generates increases accordingly, at this point, PLC regulates and controls
System 18 issues signal scaling up flow valve 15, makes 8 pressure reduction of balancing drum low-pressure end, until valve stops becoming when T'=T
Change；
4, as the temperature signal T'> T+ Δ T that pressure difference signal Δ p'> Δ p and PLC that PLC is received are received, and it is logical
Proportional flow control valve 15 is overregulated so that temperature can not be changed, and is illustrated that balancing drum gap blocks, is answered hard stop inspection.
The outer surface of the balancing drum 5 of the utility model is along saw-tooth grooves are axially arranged with, and this design is in addition to offsetting outer rim
Can also be involved in the impurity in gap in sawtooth grooves other than the eddy flow generated in gap reduces the wind that balancing drum gap 19 blocks
Danger.
Claims (6)
1. a kind of adjustment device of sectional type multi-stage pump, including suction casing, middle section, discharge section, three are fastened by flange,
The suction casing, middle section, discharge section are run through by pump shaft, and the pump shaft is socketed with first stage impeller (2) in suction casing, and pump shaft is in middle section
Be socketed with middle section impeller (3), pump shaft discharge section be socketed with impeller (4), the middle section with middle section impeller (3) by being tightly attached to
Circular passage composition together, the pump shaft are equipped with balancing drum (5) at the discharge section, it is characterised in that: the balance
Balancing drum high-voltage end (6) and balancing drum low-pressure end (8) are provided on drum (5)；The first pressure of installation on the balancing drum high-voltage end (6)
Force snesor (7), balancing drum low-pressure end (8) install second pressure sensor (9).
2. a kind of adjustment device of sectional type multi-stage pump as described in claim 1, it is characterised in that: the suction casing includes
Pump chamber before first stage impeller (2), suction chamber (1), first stage impeller；The suction chamber (1) is sequentially connected pump chamber, chopped-off head before first stage impeller
Impeller (2).
3. a kind of adjustment device of sectional type multi-stage pump as claimed in claim 2, it is characterised in that: the impeller
(4) thrust bearing (10) are connected, are equipped with upper cover plate (11) on thrust bearing (10), thrust bearing (10) and upper cover plate (11) it
Between gap be thrust bearing gap (12).
4. a kind of adjustment device of sectional type multi-stage pump as claimed in claim 3, it is characterised in that: the first stage impeller
(2) it is equipped with front shroud (17) above component, front shroud (17) connection decompression racemization pipe (16), decompression racemization pipe (16) passes through company
It connects balance pipe (14) to be connected to balancing drum low-pressure end (8), and proportional flow control valve (15) is installed on balance pipe (14).
5. a kind of adjustment device of sectional type multi-stage pump as claimed in claim 4, it is characterised in that: the thrust bearing
(10) temperature sensor (13) are installed on upper cover plate (11).
6. a kind of adjustment device of sectional type multi-stage pump as claimed in claim 5, it is characterised in that: the first pressure passes
Sensor (7), second pressure sensor (9), temperature sensor (13), proportional flow control valve (15) are connected to PLC regulator control system
(18)；There are balancing drum gap (19) between balancing drum (5) and balancing drum high-voltage end (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822031968.7U CN209557261U (en) | 2018-12-05 | 2018-12-05 | A kind of adjustment device of sectional type multi-stage pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822031968.7U CN209557261U (en) | 2018-12-05 | 2018-12-05 | A kind of adjustment device of sectional type multi-stage pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209557261U true CN209557261U (en) | 2019-10-29 |
Family
ID=68302747
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822031968.7U Active CN209557261U (en) | 2018-12-05 | 2018-12-05 | A kind of adjustment device of sectional type multi-stage pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209557261U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109340121A (en) * | 2018-12-05 | 2019-02-15 | 兰州理工大学 | A kind of adjustment system of sectional type multi-stage pump |
| CN111946622A (en) * | 2020-07-20 | 2020-11-17 | 孟飞星 | Multistage centrifugal pump |
| CN114893452A (en) * | 2022-07-14 | 2022-08-12 | 沈阳透平机械股份有限公司 | Low-consumption balance gas centrifugal compressor |
| CN116292321A (en) * | 2023-05-24 | 2023-06-23 | 孚诺泽石油装备(山东)有限公司 | Petrochemical machine pump with load abnormality early warning function |
-
2018
- 2018-12-05 CN CN201822031968.7U patent/CN209557261U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109340121A (en) * | 2018-12-05 | 2019-02-15 | 兰州理工大学 | A kind of adjustment system of sectional type multi-stage pump |
| CN111946622A (en) * | 2020-07-20 | 2020-11-17 | 孟飞星 | Multistage centrifugal pump |
| CN114893452A (en) * | 2022-07-14 | 2022-08-12 | 沈阳透平机械股份有限公司 | Low-consumption balance gas centrifugal compressor |
| CN116292321A (en) * | 2023-05-24 | 2023-06-23 | 孚诺泽石油装备(山东)有限公司 | Petrochemical machine pump with load abnormality early warning function |
| CN116292321B (en) * | 2023-05-24 | 2023-09-19 | 孚诺泽石油装备(山东)有限公司 | Petrochemical machine pump with load abnormality early warning function |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN209557261U (en) | A kind of adjustment device of sectional type multi-stage pump | |
| CN101970885B (en) | Self-monitoring system for evaluating and controlling adjustment requirements of leakage restricting devices in rotodynamic pumps | |
| CN102062107B (en) | Multi-stage axial flow submerged pump with long shaft and method for conveying phosgene | |
| CN109340121A (en) | A kind of adjustment system of sectional type multi-stage pump | |
| CN1749573A (en) | Differential thrust balance device for rotary fluid machinery | |
| CN102996496B (en) | Self-balancing self-positioning energy-saving multi-stage water pump | |
| CN100427767C (en) | Pressure relief arrangement for a pump | |
| JP2014202144A (en) | Diagnostic method for centrifugal pump | |
| US10563663B2 (en) | Nitrogen purge of compressor dry seal | |
| CN100455824C (en) | Dynamic regulation method of axial force in multistage centrifugal pump with balance drum to balance axial force | |
| CN105864093B (en) | Multistage centrifugal high-pressure liquefaction hydrocarbon pumps | |
| CN103953549A (en) | Centrifugal coal water slurry pump | |
| CN205401146U (en) | Festival segmentation multistage centrifugal pump | |
| CN102828960A (en) | Double suction multistage horizontal split pump | |
| US11795949B2 (en) | Liquid level height detection in a gas-liquid separator of a liquid supply type gas compressor | |
| CN108386531A (en) | A kind of gear oil circulating system and its control method | |
| CN205446054U (en) | Multistage sectional type centrifugal pump is inhaled to balanced type list | |
| CN201991790U (en) | Long shaft multi-stage axial flow submerged pump | |
| CN100455816C (en) | Regulator for dynamic regulation of axial force in multi-stage centrifugal pump | |
| CN104154027A (en) | Nuclear power chemical vessel make-up pump with high hydraulic component symmetric arrangement reliability | |
| CN204041512U (en) | Hydraulic part is arranged symmetrically with the high nuclear powerization of reliability and holds small pump | |
| RU188870U1 (en) | HORIZONTAL CONSOLE VALVE PUMP | |
| CN103511287A (en) | Horizontal-type radial subdivision volute-type dual-cylinder pump | |
| CN220667984U (en) | Hydraulic system for oil pump detection | |
| CN115013320B (en) | Automatic regulating high pressure water pump |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |