EP0966611A1 - Pumpe mit wellenabdichtung - Google Patents
Pumpe mit wellenabdichtungInfo
- Publication number
- EP0966611A1 EP0966611A1 EP98912460A EP98912460A EP0966611A1 EP 0966611 A1 EP0966611 A1 EP 0966611A1 EP 98912460 A EP98912460 A EP 98912460A EP 98912460 A EP98912460 A EP 98912460A EP 0966611 A1 EP0966611 A1 EP 0966611A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pump
- shaft
- space
- seal
- connection
- 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.)
- Granted
Links
- 239000007788 liquid Substances 0.000 abstract description 12
- 239000012530 fluid Substances 0.000 description 6
- 238000010926 purge Methods 0.000 description 4
- 238000011010 flushing procedure Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000004323 axial length Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C27/00—Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids
- F04C27/008—Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids for other than working fluid, i.e. the sealing arrangements are not between working chambers of the machine
- F04C27/009—Shaft sealings specially adapted for pumps
Definitions
- the invention has for its object to avoid the disadvantages indicated.
- the solution according to the invention consists in the features of claim 1 and preferably those of the subclaims. Then the shaft seal and shaft bearing are closed space separated from each other, which is connected at a geodetically low point with respect to the connection of the space to the shaft bearing with a vacuum chamber of the pump. This ensures that any leakage fluid cannot pass to the shaft bearing before it is sucked off.
- the intermediate space is expediently provided with a gas supply connection which is open to the atmosphere or is connected to a suitable gas source. If the pump is operated as a gas pump, this can be its pressure side.
- the combination of suction and gas supply leads to the effect of flushing the space. Due to the pressure difference between the suction and the gas source, the flushing gas flows through the intermediate space. The concentration of any leakage gas in the atmosphere of the intermediate space is thereby reduced and the return of the leakage to the pump is accelerated.
- any vacuum chamber of the pump is suitable for connecting the suction of the intermediate space.
- this can be the suction side of the pump.
- the summary term of the vacuum chamber of the pump should also be understood to mean those rooms which are connected to the pump and which are suitable for such a connection, for example the suction line.
- a vacuum space one is also possible, of atmospheric or superatmospheric pressure when the gas supply is taken from a room of correspondingly higher pressure.
- the intermediate space can then assume an over-atmospheric pressure. This is harmless, especially if a seal is arranged between the intermediate space and the shaft bearing, which protects the shaft bearing from excessive gas flow from the intermediate space, depending on the situation.
- it is preferred that the pressure in the space be maintained at approximately atmospheric pressure or slightly less so that flow from the space to the shaft seal is substantially prevented.
- the amount of purge gas is expediently set so that the desired function is guaranteed, but the pump operation is not significantly burdened by it.
- the purge gas quantity is set by specifying the flow cross-sections and the applied pressure difference.
- Pumps which are suitable for the mixed conveyance of gas and liquid, for example liquid ring gas pumps, are particularly suitable for the application of the invention.
- the intermediate space is expediently connected on the one hand to the suction side and on the other hand to the pressure side.
- the connection point on the pressure side should be selected (e.g. in the upper part of the liquid separator) so that no operating fluid can enter the connecting line.
- This type of connection can be used for pumps for vacuum operation as well as for pumps for pressure operation.
- connection line to the suction side can ensure that the gap is not reached by operating fluid when the pump is at a standstill.
- the connecting line to the pressure side is at least partially transparent or with a sensor so that any leaking operating fluid and need for repair of the seal can be identified.
- the invention prevents leakage that occurs outside the pump.
- the mechanical seal 4 is arranged in the area of a shaft sleeve 6, which is secured together with the hub of the impeller 2 by a shaft nut 7.
- the housing forms an annular space 8 around the outer end of the mechanical seal or the shaft sleeve 6 and the nut 7, which forms the so-called intermediate space and to which the shaft bearing 5 connects, which is separated from the annular space 8 by an arrangement of lip seals 9 is.
- the housing contains a connection bore 10, which is connected in a manner not shown to the suction side of the liquid ring gas pump.
- the connection can be made through an external pipeline or within the housing walls Drilling.
- the connection point at which the bore 10 opens into the annular space 8 is in any case lower than the point at which any liquid from the annular space 8 could overflow to the shaft bearing 5. This is the deepest point of the bore in the housing collar 12 located between the annular space 8 and the bearing 5 if no seals 9 are provided. If the seals 9 are present, this is the lowest point on the circumference of the shaft 3 in the region of the annular space 8.
- the housing forming the annular space 8 contains a gas supply connection 11, which is optionally connected to the atmosphere or the pressure side of the pump.
- the applied pressure difference results in a constant gas purging of the annular space 8. Any gaseous or liquid medium that escapes through the shaft seal 4 is returned to the compressor together with the purging gas flow. Environmental pollution caused by escaping conveying gas or operating fluid is avoided.
- the machine can continue to be operated for a short time because the leakage flow is returned to the compressor due to the flushing of the annular space. The machine remains tight to the outside.
- the axial length of the construction is small.
- the construction volume and the mass of the pump are correspondingly small.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE29704403U | 1997-03-11 | ||
DE29704403U DE29704403U1 (de) | 1997-03-11 | 1997-03-11 | Pumpe mit Wellenabdichtung |
PCT/EP1998/001365 WO1998040628A1 (de) | 1997-03-11 | 1998-03-10 | Pumpe mit wellenabdichtung |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0966611A1 true EP0966611A1 (de) | 1999-12-29 |
EP0966611B1 EP0966611B1 (de) | 2004-06-16 |
Family
ID=8037287
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98912460A Expired - Lifetime EP0966611B1 (de) | 1997-03-11 | 1998-03-10 | Pumpe mit wellenabdichtung |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0966611B1 (de) |
AT (1) | ATE269493T1 (de) |
DE (2) | DE29704403U1 (de) |
ES (1) | ES2221161T3 (de) |
WO (1) | WO1998040628A1 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102005033707A1 (de) * | 2005-07-19 | 2007-02-01 | Valeo Compressor Europe Gmbh | Vereinfachte, innenbeaufschlagte Axialgleitringdichtung für die CO2-Anwendung |
CN102678610B (zh) * | 2012-05-29 | 2015-04-08 | 上海深井泵厂有限公司 | 用于泵的辅助密封装置、长轴泵及无泄漏检修方法 |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1570512A (en) * | 1976-09-04 | 1980-07-02 | Howden Compressors Ltd | Meshing-screw gas-compressing apparatus |
US4747752A (en) * | 1987-04-20 | 1988-05-31 | Somarakis, Inc. | Sealing and dynamic operation of a liquid ring pump |
US4781553A (en) * | 1987-07-24 | 1988-11-01 | Kabushiki Kaisha Kobe Seiko Sho | Screw vacuum pump with lubricated bearings and a plurality of shaft sealing means |
DE4229017C2 (de) * | 1992-09-03 | 1995-05-24 | Sihi Gmbh & Co Kg | Flüssigkeitsringverdichter in Motorblock- oder Motorträgerausführung |
SE502099C2 (sv) * | 1992-12-21 | 1995-08-14 | Svenska Rotor Maskiner Ab | skruvkompressor med axeltätning |
DE4310740A1 (de) * | 1993-04-01 | 1994-10-06 | Knorr Bremse Ag | Schraubenkompressor, insbesondere zum Intervallbetrieb |
-
1997
- 1997-03-11 DE DE29704403U patent/DE29704403U1/de not_active Expired - Lifetime
-
1998
- 1998-03-10 AT AT98912460T patent/ATE269493T1/de not_active IP Right Cessation
- 1998-03-10 EP EP98912460A patent/EP0966611B1/de not_active Expired - Lifetime
- 1998-03-10 WO PCT/EP1998/001365 patent/WO1998040628A1/de active IP Right Grant
- 1998-03-10 DE DE59811580T patent/DE59811580D1/de not_active Expired - Lifetime
- 1998-03-10 ES ES98912460T patent/ES2221161T3/es not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO9840628A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE59811580D1 (de) | 2004-07-22 |
WO1998040628A1 (de) | 1998-09-17 |
ES2221161T3 (es) | 2004-12-16 |
EP0966611B1 (de) | 2004-06-16 |
DE29704403U1 (de) | 1998-08-13 |
ATE269493T1 (de) | 2004-07-15 |
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