CN103334968A - Mechanical sealing and flushing method and device of seafloor mud lifting pump - Google Patents
Mechanical sealing and flushing method and device of seafloor mud lifting pump Download PDFInfo
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- CN103334968A CN103334968A CN2013102900734A CN201310290073A CN103334968A CN 103334968 A CN103334968 A CN 103334968A CN 2013102900734 A CN2013102900734 A CN 2013102900734A CN 201310290073 A CN201310290073 A CN 201310290073A CN 103334968 A CN103334968 A CN 103334968A
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Abstract
A mechanical sealing and flushing method and device of a seafloor mud lifting pump comprises a seawater pump, a pump outlet, a pump inlet, an impeller, an O-type ring and a seawater flushing pipe. The seawater pump is arranged in seawater and is coaxial with a motor, the pump outlet is formed in the seawater pump, the pump inlet is formed in a front end cover of the seawater pump, the impeller is arranged inside the seawater pump and is connected with a motor shaft through keys, the O-type ring is arranged between the seawater pump and the front end cover of the motor, and the seawater flushing pipe is connected with the pump outlet and a sealing and flushing opening. The seawater pump is immersed in the seawater, the pump inlet is directly communicated with the seawater, the seawater is boosted through the effect of the impeller inside the seawater pump, and seawater flowing and flushing to a sealing face are achieved. The mechanical sealing and flushing method and device of the seafloor mud lifting pump is simple in structure, sealing liquid does not need to be drawn from a sea surface to flush a circulation pipeline, the problem of sealing face flushing of the seafloor mud lifting pump of a seafloor mud lifting drilling well can be effectively solved, meanwhile, the mechanical sealing and flushing method and device of the seafloor mud lifting pump can be applied to ocean mining and other seafloor solid-liquid two-phase conveying pumps, and the demands for mechanical sealing and flushing of deep sea seafloor solid-liquid two-phase conveying pumps are met.
Description
Technical field
The present invention relates to not have marine riser mud veclamation drilling technology, particularly a kind of seabed mud lifting pump mechanical sealing purging method and device.
Background technique
No marine riser mud veclamation drilling technology is an implementation of double-gradient well drilling technology, different with other double-gradient well drilling system schemas, in no riser system, use single gradient mud, but realize double-gradient well drilling by subsea pump control subsea wellheads pressure near the seawater fluid pressure.Drilling fluid is pumped in the drilling rod by the sea in this system, arrive the shaft bottom through drilling rod, impact grinding rock and cutting carring are by returning on the bore hole annulus, enter lifting pump in seabed at the annular space top through the rotation part flow arrangement, landwaste and drilling fluid return drill platform by the mud reflux pipeline under the subsea pump effect.In the no marine riser mud veclamation drilling technology because of seabed, deep-sea working environment and institute's fed sheet of a media for containing drill cuttings, particularly the requirement of axle envelope is high especially to the reliability of subsea pump, if adopt the mode of mechanical seal, because what subsea pump was carried is two-phase solid-liquid fluid, so must consider the washing problems of sealing surface.
If adopt the backwashing manner of traditional self-circulating machine sealing, need introduce from drill platform and sealflush pipeline, for deepwater drilling, long sealflush pipeline and can bring too high cost and integrity problem, the backwashing manner of self-loopa simultaneously also can make the increases such as auxiliary element recycle pump, control valve of mechanical seal rinsing.
Summary of the invention
For solving the problem that above-mentioned prior art exists, the object of the present invention is to provide the mud lifting pump mechanical sealing purging method of a kind of seabed and device, need not from land introducing seal flush liquid circulating line, and the flushing performance is not subjected to the sea water advanced flushing that can realize the mechanical seal of no marine riser drilling well subsea pump that influences.
For achieving the above object, technological scheme of the present invention is:
The purging method of a kind of seabed mud lifting pump mechanical sealing, this method comprises the sea water pump 1 that places seawater and motor coaxle, pump discharge 2 communicates with the seal flush port of opening on Seal cage 7 by sealflushing pipe 6, pump inlet 3 directly communicates with seawater, effect by impeller 4 in the sea water pump 1 is to the seawater supercharging, realize seawater flow and to the flushing of sealing surface.
Mobile the boosting of described seawater flushing liquid is by placing the sea water pump 1 of seawater to realize with motor coaxle.
A kind of seabed mud lifting pump mechanical sealing Rinsing unit, it comprises the sea water pump 1 that places seawater and motor coaxle, open the pump discharge 2 on sea water pump 1, open the pump inlet 3 on sea water pump 1 front cover, be arranged at the impeller 4 that links to each other with motor shaft by key in the sea water pump 1, be arranged on the O shape circle 5 between sea water pump 1 and the motor front cover, connect the seawater flushing pipe 6 of pump discharge 2 and seal flush port 7, sea water pump 1 is invaded in the seawater, and pump inlet 3 directly communicates with seawater.
The present invention is owing to take above technological scheme to have the following advantages:
1, the present invention has realized that the pressure flow of seawater is moving, thereby has realized the flushing to the subsea pump mechanical sealing surface owing to increased impeller with motor coaxle, makes mechanical seal have longer service life and reliability.
2, the present invention is because the inlet pressure of sea water pump is sea water static pressure power, and the flushing pressure that sea water pump need provide is little, and the impeller consumed energy is not high, and the ability to work of sea water pump does not change with the depth of water.
3, the present invention is because impeller of sea water pump is coaxial with seabed mud lifting pump motor, thus do not need independent motor driving sea water pump, when improving mechanical seal working life, can be because of the reliability of the increase reduction whole system of sea water pump.
4, the present invention does not need to draw the lower seal washing solution from platform owing to adopt the seabed seawater as washing solution, has so not only reduced the washing solution pipeline that length equals the depth of water, has reduced simultaneously from the platform needed accessory of pipeline that goes between.
5, the present invention is simple in structure, do not need to draw from the sea sealing fluid flush cycle pipeline, can effectively solve the sealing surface washing problems of seabed mud lifting drilling well seabed mud lifting pump, also can be applied to simultaneously on ocean mining and other seabed solid-liquid two-phase transfer pump, satisfy the requirement of seabed, deep-sea solid-liquid two-phase transfer pump mechanical seal needs flushing.
Description of drawings
Accompanying drawing is structure principle chart of the present invention
Embodiment
The present invention will be described in detail below in conjunction with accompanying drawing:
The purging method of a kind of seabed mud lifting pump mechanical sealing, this method comprises the sea water pump 1 that places seawater and motor coaxle, pump discharge 2 communicates with the seal flush port of opening on Seal cage 7 by sealflushing pipe 6, pump inlet 3 directly communicates with seawater, effect by impeller 4 in the sea water pump 1 is to the seawater supercharging, realize seawater flow and to the flushing of sealing surface.
Mobile the boosting of described seawater flushing liquid is by placing the sea water pump 1 of seawater to realize with motor coaxle.
A kind of seabed mud lifting pump mechanical sealing Rinsing unit, it comprises the sea water pump 1 that places seawater and motor coaxle, open the pump discharge 2 on sea water pump 1, open the pump inlet 3 on sea water pump 1 front cover, be arranged at the impeller 4 that links to each other with motor shaft by key in the sea water pump 1, be arranged on the O shape circle 5 between sea water pump 1 and the motor front cover, connect the seawater flushing pipe 6 of pump discharge 2 and seal flush port 7, sea water pump 1 is invaded in the seawater, and pump inlet 3 directly communicates with seawater.
Working principle is:
When impeller 4 rotates in sea water pump 1, liquid is thrown away by pump discharge 2 under the effect of blade rotary centrifugal force, the impeller eye center forms low pressure simultaneously, thereby at the middle pressure reduction that produced of pump inlet 3 and impeller 4 entrances, seawater constantly flows to impeller 4 by sea water pump 1 import under the effect of this pressure reduction, in the process of impeller 4 rotations, one side constantly sucks seawater like this, and one side is constantly delivered to Seal cage with the seawater booster pump that sucks again.Because sea water pump 1 immerses in the seawater, pump inlet 3 communicates with seawater, and the pressure of pump inlet 3 just equals the static pressure of seawater, makes that pressure and the depth of water that 1 pair of seawater of sea water pump increases are irrelevant.
Also be the approaching sea water static pressure power that equals of inlet pressure of subsea pump simultaneously owing to subsea wellheads pressure in the no marine riser mud lifting drilling well, and mud lifting pump impeller when slurry conveyed in seabed generally all is processed with back blade, it is few to make that the Seal cage internal pressure generally exceeds the pressure of pump inlet 3, because mud lifting pump inlet pressure in seabed is all sea water static pressure power with the inlet pressure of sealflushing sea water pump 1, so the outlet pressure of sea water pump does not need too big, flushing flow rate is little in addition, so 1 consumed power of sea water pump is also little.
Claims (3)
1. seabed mud lifting pump mechanical sealing purging method, it is characterized in that: comprise the sea water pump 1 that places seawater and motor coaxle, pump discharge 2 communicates with the seal flush port of opening on Seal cage 7 by sealflushing pipe 6, pump inlet 3 directly communicates with seawater, effect by impeller 4 in the sea water pump 1 is to the seawater supercharging, realize seawater flow and to the flushing of sealing surface.
2. a kind of seabed mud lifting pump mechanical sealing as claimed in claim 1 purging method is characterized in that: mobile the boosting of described seawater flushing liquid is by placing the sea water pump 1 of seawater to realize with motor coaxle.
3. seabed mud lifting pump mechanical sealing Rinsing unit, it comprises the sea water pump 1 that places seawater and motor coaxle, open the pump discharge 2 on sea water pump 1, open the pump inlet 3 on sea water pump 1 front cover, be arranged at the impeller 4 that links to each other with motor shaft by key in the sea water pump 1, be arranged on the O shape circle 5 between sea water pump 1 and the motor front cover, connect the seawater flushing pipe 6 of pump discharge 2 and seal flush port 7, it is characterized in that: sea water pump 1 is invaded in the seawater, and pump inlet 3 directly communicates with seawater.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013102900734A CN103334968A (en) | 2013-07-10 | 2013-07-10 | Mechanical sealing and flushing method and device of seafloor mud lifting pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013102900734A CN103334968A (en) | 2013-07-10 | 2013-07-10 | Mechanical sealing and flushing method and device of seafloor mud lifting pump |
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| Publication Number | Publication Date |
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| CN103334968A true CN103334968A (en) | 2013-10-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN2013102900734A Pending CN103334968A (en) | 2013-07-10 | 2013-07-10 | Mechanical sealing and flushing method and device of seafloor mud lifting pump |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115507039A (en) * | 2022-10-12 | 2022-12-23 | 东莞市华汇精密机械有限公司 | Turbid liquid delivery pump |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7112033B1 (en) * | 2003-02-24 | 2006-09-26 | Wright Pumps, Inc. | Hygienic mechanical seal flushing system for pure liquids in sanitary centrifugal pumps |
| CN201090546Y (en) * | 2007-08-14 | 2008-07-23 | 上海连成（集团）有限公司 | Abrasion-proof centrifugal pump for coal mine using mechanical seal |
| CN101509504A (en) * | 2009-04-02 | 2009-08-19 | 湖北三峡泵业有限公司 | Mechanical seal cooling and flushing device for single-stage centrifugal pump |
| CN202001396U (en) * | 2011-03-21 | 2011-10-05 | 天津市聚能高压泵有限公司 | Flushing device of mechanical seal for high pressure pump |
-
2013
- 2013-07-10 CN CN2013102900734A patent/CN103334968A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7112033B1 (en) * | 2003-02-24 | 2006-09-26 | Wright Pumps, Inc. | Hygienic mechanical seal flushing system for pure liquids in sanitary centrifugal pumps |
| CN201090546Y (en) * | 2007-08-14 | 2008-07-23 | 上海连成（集团）有限公司 | Abrasion-proof centrifugal pump for coal mine using mechanical seal |
| CN101509504A (en) * | 2009-04-02 | 2009-08-19 | 湖北三峡泵业有限公司 | Mechanical seal cooling and flushing device for single-stage centrifugal pump |
| CN202001396U (en) * | 2011-03-21 | 2011-10-05 | 天津市聚能高压泵有限公司 | Flushing device of mechanical seal for high pressure pump |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115507039A (en) * | 2022-10-12 | 2022-12-23 | 东莞市华汇精密机械有限公司 | Turbid liquid delivery pump |
| CN115507039B (en) * | 2022-10-12 | 2023-07-25 | 东莞市华汇精密机械有限公司 | Suspension conveying pump |
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Addressee: China Petroleum University (East China) Document name: Notification of an Office Action |
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