EP1977112A1 - Kreiselpumpe mit axialschubausgleichseinrichtung - Google Patents
Kreiselpumpe mit axialschubausgleichseinrichtungInfo
- Publication number
- EP1977112A1 EP1977112A1 EP07711923A EP07711923A EP1977112A1 EP 1977112 A1 EP1977112 A1 EP 1977112A1 EP 07711923 A EP07711923 A EP 07711923A EP 07711923 A EP07711923 A EP 07711923A EP 1977112 A1 EP1977112 A1 EP 1977112A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- centrifugal pump
- pressure
- shaft
- impeller
- axial
- 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
- 238000005096 rolling process Methods 0.000 claims description 21
- 230000006378 damage Effects 0.000 description 4
- 230000002706 hydrostatic effect Effects 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000000383 hazardous chemical Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000009182 swimming Effects 0.000 description 1
- 229910000648 terne Inorganic materials 0.000 description 1
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
- F04D29/00—Details, component parts, or accessories
- F04D29/08—Sealings
- F04D29/16—Sealings between pressure and suction sides
- F04D29/165—Sealings between pressure and suction sides especially adapted for liquid pumps
- F04D29/167—Sealings between pressure and suction sides especially adapted for liquid pumps of a centrifugal flow wheel
-
- 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
- F04D29/04—Shafts or bearings, or assemblies thereof
- F04D29/041—Axial thrust balancing
- F04D29/0413—Axial thrust balancing hydrostatic; hydrodynamic thrust bearings
-
- 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
- F04D29/04—Shafts or bearings, or assemblies thereof
- F04D29/041—Axial thrust balancing
- F04D29/0416—Axial thrust balancing balancing pistons
Definitions
- the invention relates to a single-stage centrifugal pump with Axialschubaus GmbHseinrich- device, wherein in the housing of the centrifugal pump connected to a shaft impeller is rotating, at least one arranged between the impeller and housing split ring seal forms a discharge space, the discharge chamber connected to a pressure-transmitting connection to the pressure range of the centrifugal pump is, and between shaft and housing a shaft seal is arranged.
- a generic Axialschubentlastungs is known from DE 196 31 824 A1.
- a first radially-flowing regulating gap is arranged between the impeller outlet and a suction-side radial bearing.
- Such a suction-side shaft bearing is designed as a sliding bearing, arranged directly on the Laufradsaugmund and consuming to produce.
- a second radially flowed control gap is arranged in the pressure-side impeller region with respect to the first control gap on a smaller diameter.
- a control device for an axial thrust compensation of a hydrostatic thrust bearing assembly is known by a compressor, in which the change in the carrying capacity is achieved with a hydrostatic device.
- a shaft which drives the impeller is radially held in a bearing carrier in two cylinder bearings and is additionally axially positioned in two disk-shaped thrust bearings.
- a continuously pumping device generates in the thrust bearings a hydrostatic bearing pressure which can vary depending on the gap width of the bearing.
- Axial shifts of the shaft lead to such changes in the gap width and influence the hydrodynamic bearing pressures in the two thrust bearings.
- a pressure difference between the two bearings serves as a control variable for a control valve of an axial thrust compensating device of the impeller. It has a complex structure which is suitable for spe- particular special cases is justified.
- the disadvantage here is the risk of environmental hazards due to the complex lubricant lines, as they can leak or be damaged.
- the DD 231 829 A1 shows in a centrifugal pump another method for compensating for an axial thrust.
- a compensating piston rotating with the shaft is arranged in an additional housing part, the diameter of which corresponds approximately to half the impeller diameter.
- a long throttle section is formed, whereby, seen in the flow direction, form different pressure regions in front of and behind the balance piston.
- two pressure measuring points which measure the pump pressure in the discharge nozzle and in the space behind the balance piston, a pressure difference that can be determined from this is transmitted to a computer.
- the signal of a speed measuring device is fed into the computer. The computer determines when a difference between axial thrust and
- Balancing force of the balance piston a relief pressure for the space behind the balance piston. And by a control signal to a control valve, the pressure in the area behind the balance piston is changed so far until a state of equilibrium and thus relief of the shaft bearing occurs.
- the disadvantage is the detection and processing of three parameters and the use of a special compensating piston, which does not contribute directly to the function of the pump, increases the volume and variety of parts and increases the susceptibility to failure.
- the invention is therefore based on the object to achieve a low-cost and operationally safe reduction of axial thrust, which ensures a high bearing life and a long life of the shaft seal for a roller bearing pump shaft.
- the solution provides that the shaft is provided in a manner known per se with at least one rolling bearing receiving axial forces, and that a pressure difference between a pressure in the relief space and a point can be achieved via a connection other pressure in the centrifugal pump housing as a direction constant and permissible axial force presses the rotating pump parts against the rolling bearing. This ensures a continuous and defined load for the bearings and also for the shaft seal. It has been recognized that the cause of damage to bearings and seals is a problem with known balancing devices that only achieves an insufficient reduction of the axial force at certain operating points or that it is not possible to avoid oscillation of the axial force by the value 0.
- the dimensions of the split-ring seals, the shaft seal chamber and the relief chamber are selected in order to achieve a defined axial thrust on the force-absorbing rolling bearing via the connection and the different pressures.
- the acting axial force is smaller than the permissible bearing load of the force-absorbing rolling bearing, whereby the bearing life is extended.
- a throttling device arranged in the connection in the relief space adjusts the directionally constant axial force arising from the pressure difference to the rolling bearing.
- a centrifugal pump operation with approximately constant operating parameters, it is a fixed or adjustable throttle device.
- the throttle device is designed as a permanently adjustable throttle device.
- the direction constant axial force generated on the bearings is by a arranged in the connection, adjustable or controllable throttle device in the discharge space.
- Their size is chosen so that it always lies well below the permissible axial bearing force in order not to adversely affect the bearing life. And their size is chosen so large that a self-adjusting axial force prevents floating of the rotating parts and thus their premature destruction reliable.
- a variable via the connection in its pressure relief space on the suction side or the pressure side of the impeller is arranged.
- only one relief space is changed in its pressure via the pressure-transmitting connection, in order to obtain a defined axial force on the rolling bearing.
- the connection can be made between the suction side or the pressure side of the pump. This depends on the dimensions inside the pump housing and those of the impeller.
- a sensor detects an axial roller bearing load
- a controller generates with the sensor signal an actuating signal for an adjustable throttle device and the throttle device sets in the discharge space a rolling bearing loading axial force.
- the senor detects the axial bearing load according to size and direction.
- one or more controller characteristic (s) stored in the controller corrects or corrects influences that alter the axial bearing load.
- the controller processes these signal values and restores the permissible operating status with the help of one or several controller characteristic (s).
- Fig. 1 - 4 different configurations of a discharge space on the impeller of a single-stage centrifugal pump.
- FIG. 1 shows a centrifugal pump housing 1 with an impeller 2 arranged therein and a pump cover 3 closing the housing.
- Impeller 2 has a suction-side throttle gap in the region of the impeller inlet in the form of a gap seal 4, which ensures high pressure in the impeller side space 5 on the intake side and gap losses reduced.
- the impeller 2 on a larger diameter has a second, here pressure-side gap seal 6, which ensures a high pressure in the larger impeller side impeller side space 7.
- the pressure-side gap seal 6 bounded or enveloped with its diameter a arranged on a smaller diameter discharge chamber 8, which is connected via a connection 13 with an adjustable throttle device 14 disposed therein with a location other pressure, here the discharge nozzle 15 of the centrifugal pump.
- the connection 13 may be designed as a conventional conduit system.
- the location of other pressure selected in FIG. 1 has a higher pressure than that of the relief space 8 and the choice of location is dependent on the later operating conditions of a pump.
- the location of other pressure may be in the area of the impeller outlet, a guide, the discharge nozzle or the place is considered an ex- Ternes pressure reservoir formed.
- the pressure level on the impeller back or in the impeller side impeller range is set to a value. From the area ratios in the suction-side impeller side space 5, in the pressure-side impeller side space 7 and in the relief space 8 as well as the pressures in these spaces, different forces result. Another force results from the
- the rolling bearing 11 is formed in the embodiment shown as a pure radial bearing, while two paired bearings 11.1 and 11.2 record the radial and axial forces due to their training. They consist of two angular contact ball bearings, whereby other types of rolling bearings are applicable.
- the shaft 10 which is mounted here in a bearing carrier 12, may also be formed with elimination of the bearing carrier as part of a driving electric motor.
- the bearings of the motor are dimensioned accordingly to accommodate an axial thrust of the pump can.
- the appropriately designed bearing support 12 or the pump cover 3 can be provided with a - known per se, not shown here - short stub shaft, which would be held only in a rolling bearing 11.1. Their shaft end would then be connected to a stub shaft of a block motor.
- the pressure level in the discharge chamber 8 is set during operation over a wide range of values.
- relief holes 9 on the impeller 2 is no longer necessary and available.
- the pressure in the relief chamber 8 and a shaft seal chamber 16 is adjusted so that a resulting axial force F A is formed as a fixed bearing shaft bearing in the form of rolling bearings 11.1, 11.2 always below their allowable limits. If, during the life of a pump due to wear in the gap seal 4 or 6 set other pressure conditions in space 5 and / or 8 or vibrations of the rotating parts occur, so by simply adjusting the throttle device 14 of the original load condition of the bearings restored become.
- Fig. 2 corresponds in construction to the illustration in Fig. 1, but the pressure-side Entlastungsra ⁇ m 8 via the connection 13 with the suction side 18 of the centrifugal pump is in operative connection. Also in this case, the impeller 2 is equipped without relief bores. Instead, the pressure level in the discharge chamber 8 and shaft seal chamber 16 is adjusted by means of the adjustable throttle device 14.1 so that the load on the shaft seal 17 and the rolling bearing 11.1, 11.2 always below the allowable bearings Limits are.
- a sensor 19 which is connected to a controller 20 is used. Changes in the storage condition are detected by the sensor 19 and passed on to the controller 20 on. This determines a controller signal, with the aid of which the controllable throttle device 14.1 adjusted and the permissible axial force F A is set again.
- Fig. 3 shows a variant in which a suction-side relief space 21 is formed by a second, arranged on a larger diameter, suction-side throttle gap in the form of a gap seal 22 with a gap diameter D and a gap width s.
- the pressure-side relief space shown in FIGS. 1 and 2 is omitted in this variant.
- This suction-side relief space 21 is connected via the connection PLEg 13 with integrated throttle device 14 with the pressure range of Druckstut- zen 15 connected to the centrifugal pump. By appropriate adjustment of the throttle device 14, the generation of the continuous axial force F A is ensured.
- Fig. 4 shows a variant of Fig. 3, wherein the centrifugal pump is designed for operation with a very high inlet pressure.
- the suction-side relief space 21 is connected to the suction region 18 via the pressure-carrying connection 13 in order to ensure the defined axial force F A on the shaft bearing 11.1, 11.2.
- the axial force F A can be influenced.
- a bearing load sensor is arranged in the region of the axial forces receiving bearing, which consists of two bearings 11.1, 11.2 in the form of angular contact ball bearings, which continuously determines the axial force. It can also be found in the embodiments of FIGS. 1 and 3 use. It provides a signal to a control device 20, which compares a respective existing axial force F A with a stored setpoint. In the event of a deviation, the control device 20 generates a control signal for an adjustable throttle device 14.1. This regulates the pressure in the relief chamber 8 or 21 to a value which has a defined, low axial force F A for the rolling bearings 11.1, 11.2 result.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Control Of Non-Positive-Displacement Pumps (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102006011613A DE102006011613A1 (de) | 2006-03-14 | 2006-03-14 | Kreiselpumpe mit Axialschubausgleichseinrichtung |
PCT/EP2007/002178 WO2007104526A1 (de) | 2006-03-14 | 2007-03-13 | Kreiselpumpe mit axialschubausgleichseinrichtung |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1977112A1 true EP1977112A1 (de) | 2008-10-08 |
EP1977112B1 EP1977112B1 (de) | 2010-05-05 |
Family
ID=38141232
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07711923A Active EP1977112B1 (de) | 2006-03-14 | 2007-03-13 | Kreiselpumpe mit axialschubausgleichseinrichtung |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1977112B1 (de) |
AR (1) | AR059835A1 (de) |
AT (1) | ATE467051T1 (de) |
DE (2) | DE102006011613A1 (de) |
WO (1) | WO2007104526A1 (de) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102018108827B3 (de) | 2018-04-13 | 2019-05-29 | Trumpf Schweiz Ag | Verfahren zur Steuerung von zumindest einem Radialgebläse in einer Kälteanlage sowie Radialgebläse |
CN108939182B (zh) * | 2018-09-14 | 2023-10-13 | 长治市久安人工心脏科技开发有限公司 | 一种用于人工心脏轴流泵的磁卸载控制及检测系统 |
CN112145449B (zh) * | 2020-10-08 | 2022-06-07 | 兰州理工大学 | 一种离心泵的活塞式叶轮轴向力测试装置 |
CN118103600A (zh) * | 2021-09-21 | 2024-05-28 | 斯凯孚公司 | 泵的轴承配置和操作方法 |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1703049B2 (de) * | 1968-03-26 | 1974-09-26 | Allweiler Ag, 7760 Radolfzell | Bausatz von Kreiselpumpen |
DE2043550C2 (de) * | 1970-01-07 | 1985-10-03 | Judson S. Los Angeles Calif. Swearingen | Steuervorrichtung für den Axialschubausgleich einer hydrodynamischen Drucklageranordnung |
DE3122810A1 (de) * | 1981-06-09 | 1982-12-30 | Rotoflow Corp., 90064 Los Angeles, Calif. | Wellenbefestigungsvorrichtung |
EP0078345A1 (de) * | 1981-10-31 | 1983-05-11 | Bran & Lübbe GmbH | Spaltrohrmotor-Kreiselpumpe mit Axialschubausgleich |
JPS59160093A (ja) * | 1983-03-04 | 1984-09-10 | Hitachi Ltd | サブマ−ジブルポンプの軸スラスト荷重低減装置 |
US5248239A (en) * | 1992-03-19 | 1993-09-28 | Acd, Inc. | Thrust control system for fluid handling rotary apparatus |
DE19631824A1 (de) * | 1996-08-07 | 1998-02-12 | Klein Schanzlin & Becker Ag | Kreiselpumpenlagerung mit Axialschubausgleich |
US5980114A (en) * | 1997-01-20 | 1999-11-09 | Oklejas, Jr.; Eli | Thrust bearing |
-
2006
- 2006-03-14 DE DE102006011613A patent/DE102006011613A1/de not_active Withdrawn
-
2007
- 2007-03-13 WO PCT/EP2007/002178 patent/WO2007104526A1/de active Application Filing
- 2007-03-13 AT AT07711923T patent/ATE467051T1/de active
- 2007-03-13 DE DE502007003649T patent/DE502007003649D1/de active Active
- 2007-03-13 EP EP07711923A patent/EP1977112B1/de active Active
- 2007-03-14 AR ARP070101029A patent/AR059835A1/es not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of WO2007104526A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE502007003649D1 (de) | 2010-06-17 |
WO2007104526A1 (de) | 2007-09-20 |
EP1977112B1 (de) | 2010-05-05 |
DE102006011613A1 (de) | 2007-09-20 |
AR059835A1 (es) | 2008-04-30 |
ATE467051T1 (de) | 2010-05-15 |
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