EP4562307A1 - Pumpenanordnung - Google Patents
PumpenanordnungInfo
- Publication number
- EP4562307A1 EP4562307A1 EP23740986.7A EP23740986A EP4562307A1 EP 4562307 A1 EP4562307 A1 EP 4562307A1 EP 23740986 A EP23740986 A EP 23740986A EP 4562307 A1 EP4562307 A1 EP 4562307A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- expansion element
- section
- hydraulic housing
- pump arrangement
- free end
- 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.)
- Pending
Links
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
- F04D7/00—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts
- F04D7/02—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type
- F04D7/08—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being radioactive
-
- 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
- F04D29/02—Selection of particular materials
- F04D29/026—Selection of particular materials especially adapted for liquid pumps
-
- 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
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/426—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps
-
- 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
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/426—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps
- F04D29/4293—Details of fluid inlet or outlet
-
- 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
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/44—Fluid-guiding means, e.g. diffusers
- F04D29/445—Fluid-guiding means, e.g. diffusers especially adapted for liquid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D7/00—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts
- F04D7/02—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type
- F04D7/06—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being hot or corrosive, e.g. liquid metals
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2230/00—Manufacture
- F05D2230/20—Manufacture essentially without removing material
- F05D2230/23—Manufacture essentially without removing material by permanently joining parts together
- F05D2230/232—Manufacture essentially without removing material by permanently joining parts together by welding
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2300/00—Materials; Properties thereof
- F05D2300/10—Metals, alloys or intermetallic compounds
- F05D2300/17—Alloys
- F05D2300/171—Steel alloys
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2300/00—Materials; Properties thereof
- F05D2300/50—Intrinsic material properties or characteristics
- F05D2300/502—Thermal properties
- F05D2300/5021—Expansivity
Definitions
- the invention relates to a pump arrangement, in particular a centrifugal pump arrangement, with a hydraulic housing, a suction port formed on the hydraulic housing with an inlet opening, a pressure port formed on the hydraulic housing with an outlet opening, a flow chamber at least partially delimited by the hydraulic housing, a housing cover closing the hydraulic housing, a housing cover in the Flow chamber arranged impeller which can be driven via a shaft about an axis of rotation and an inlet nozzle with a first end connected directly or indirectly to the hydraulic housing and a substantially cylindrical section which extends coaxially to the axis of rotation in the direction of the inlet opening, with a second, opposite the first end, free end is arranged at the transition from the inlet opening to the flow chamber in a recess of the inlet opening and a radial annular gap is created in the area of the recess between the section of the inlet nozzle and the hydraulic housing.
- Such pump arrangements are used, for example, in nuclear main coolant pumps.
- the free end of the inlet nozzle and the hydraulic housing form an annular gap that connects the high-pressure and low-pressure areas of the pump. Due to the pressure difference between the high and low pressure areas, a volume flow occurs through this gap, which leads to volumetric losses and thus to reduced pump efficiency. These volumetric losses are dependent
- REPLACEMENT SHEET (RULE 26) on the pressure difference and the gap width between the housing and the inlet nozzle.
- RULE 26 REPLACEMENT SHEET
- the aim of the present invention is to minimize the annular gap, in particular the radial gap width, in hot operation and thus reduce the volumetric losses and increase the efficiency of the pump. This takes into account the fact that a certain gap at ambient temperature is still required for assembly reasons.
- the present invention is based on the object of mitigating or even completely eliminating the shortcomings of the devices known from the prior art. Specifically, it is an object of the present invention to provide a pump arrangement in which the increase in the gap due to pressure and temperature during hot operation of the pump is reduced and the efficiency of the pump is increased.
- a pump arrangement with the feature of claim 1, according to which the cylindrical section is divided into a first section and a second section near the free end and in the area of the free end the second section comprises a sleeve or ring-like expansion element, whereby the material of the expansion element has a higher thermal expansion coefficient than the material of the hydraulic housing.
- the material of the expansion element comprises austenitic steel.
- the austenitic material has a high coefficient of expansion and at the same time good resistance to the pumped medium.
- a simple and operationally reliable embodiment can be obtained by welding the expansion element and the first section together are, wherein the material of the expansion element has a higher coefficient of expansion than the hydraulic housing.
- the expansion element preferably has a contact surface facing the first section, which includes an axial annular elevation and an axial recess.
- the first section has a contact surface directed towards the expansion element, which is at least partially designed to be complementary to the contact surface of the expansion element.
- the second section close to the free end in the area of the free end comprises the sleeve- or ring-like expansion element and a holding device that at least partially surrounds the expansion element.
- the holding device is designed in one piece with the first section and the expansion element is arranged in the holding device.
- the material of the holding device advantageously has a lower expansion coefficient than the material of the sleeve- or ring-like expansion element. As a result, the holding device is stretched outwards via the sleeve- or ring-like expansion element at higher temperatures due to the higher expansion coefficient of the sleeve- or ring-like expansion element and thus the gap to the hydraulic housing is reduced or closed.
- the expansion element and the holding device are connected to one another using a shrink fit.
- the use of a welding process can therefore be dispensed with.
- the holding device advantageously has an area with an enlarged inner diameter, such that the holding device has flexibility in the radial direction.
- FIG. 1 shows a longitudinal section through a pump arrangement with an inlet nozzle according to the prior art
- Fig. 3 shows a longitudinal section through a second embodiment of the inlet nozzle according to the invention.
- the pump arrangement 1 shows a pump arrangement 1 in the form of a main coolant pump arrangement according to the prior art.
- the pump arrangement 1 has a housing part designed as a hydraulic housing 2, a housing cover 3 and a lantern 4.
- the hydraulic housing 2 has an inlet opening 6 on a suction port 5 for sucking in a pumped medium and an outlet opening 8 on a pressure port 7 for ejecting the pumped medium.
- the housing cover 3 is arranged on the side of the hydraulic housing 2 opposite the inlet opening 6.
- the lantern 4 is attached to the side of the housing cover 3 facing away from the hydraulic housing 2.
- a motor, not shown, is connected to the hydraulic housing 2 by means of the lantern.
- a bearing device (not shown) for supporting the shaft 9 is provided in the opening 10.
- the flow chamber 11 is sealed against leakage into the lantern 4 with a sealing package 12, which comprises several sealing devices arranged one behind the other in the axial direction.
- An impeller 14 is attached to an end 13 of the shaft 9 located within the flow chamber 11.
- a stator 15 surrounding the impeller 14 is arranged or attached to the hydraulic housing 2 in a rotationally fixed manner and cannot be displaced in the axial direction.
- the stator 15 ensures that the swirl flow emerging from the impeller 14 is diverted into a swirl-free flow with as little loss as possible, whereby the magnitude of the absolute speed is reduced and the static pressure is increased.
- An inlet nozzle 17 is attached to the stator 15 with a first end 16.
- the inlet nozzle 17 has a substantially cylindrical section 18 which extends coaxially to the axis of rotation A in the direction of the inlet opening 6.
- a second, free end 19, opposite the first end 16, is arranged at the transition from the inlet opening 6 to the flow chamber 11 in a recess 20 of the inlet opening 6, i.e. an area with an enlarged inner diameter.
- a radial annular gap 21 is created between the section 18 near the area of the free end 19 of the inlet nozzle 17 and the hydraulic housing 2.
- the inlet nozzle 17 and the stator 15 can be designed as a one-piece or one-piece component.
- an inlet nozzle 17 connected directly to the hydraulic housing 2 can also be provided.
- 2 shows the arrangement of the free end 19 of a first embodiment of the inlet nozzle 17 according to the invention in the recess 20, the left area of FIG. 2 showing the complete inlet nozzle 17 and the right area essentially showing the free end 19 of the same.
- the section 18 is divided into a first section 22 and a second section 23 near the free end 19.
- the second section 23 comprises a sleeve- or ring-like expansion element 24.
- the expansion element 24 and the first section 23 are welded together.
- the inner surface of the expansion element 24 and the inner surface of the first section 22 of the section 18 are essentially aligned.
- the material of the expansion element 24 has a higher thermal expansion coefficient than the material of the hydraulic housing 2 and/or the section 18.
- the expansion element 24 has a contact surface 25 facing the first section 22, which includes an annular axial elevation 26 and an axial recess 27.
- the first section 22 has a contact surface 28 directed towards the expansion element 24, which is at least partially designed to be complementary to the contact surface 25 of the expansion element 24.
- the contact surface 28 has a groove 29 into which the elevation 26 engages.
- the inner lateral surface of the expansion element 24 and the inner lateral surface of the first section 22 are essentially in alignment in a flow-efficient manner.
- the welding can be a partial welding, as shown in Figure 2, or a continuous welding over the complete radial extent of the section 23.
- the annular gap 21, which has a radial gap width w, is designed such that in the cold state of the centrifugal pump 1, a backflow of the pumped medium via the annular gap 21 into the inlet opening 6, thus from the high-pressure area via the annular gap 21 into the low-pressure area, is possible.
- the free end 19, in particular the expansion element 24, expands. Since the material of the expansion element 24 has a higher thermal expansion coefficient than the material of the hydraulic housing 2, the expansion element 24 comes into contact with the hydraulic housing 2 in the recess 20 of the inlet opening 6, in particular due to its expansion in the radial direction, or at least reduces the annular gap 21 in radial direction.
- FIG 3 shows a further embodiment of the inlet nozzle 17 according to the invention.
- the holding device 30 is formed in one piece with the first section 22 and thus forms an area with an enlarged inner diameter.
- the expansion element 24 is arranged in the holding device 30. Expansion element 24 and holding device 30 are connected to one another by means of a shrink fit. In this embodiment too, the inner lateral surface of the expansion element 24 and the inner lateral surface of the first subsection 22 of the section 18 are essentially aligned.
- the material of the expansion element 24 has a higher coefficient of thermal expansion than the material of the hydraulic housing 2 and the holding device 30.
- the holding device 30 has an area 31 with an enlarged inner diameter, so that the holding device 30 has a certain flexibility in the radial direction.
- the expansion element 24 expands. Through its radial expansion component, the expansion element 24 brings the flexibly arranged holding device 30 in the recess 20 of the inlet opening 6 into contact with the hydraulic housing 2 or at least reduces the annular gap 21, in particular the radial gap width w, in the radial direction.
- the expansion element 24 preferably comprises austenitic steel.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102022118510.9A DE102022118510A1 (de) | 2022-07-25 | 2022-07-25 | Pumpenanordnung |
| PCT/EP2023/068714 WO2024022777A1 (de) | 2022-07-25 | 2023-07-06 | Pumpenanordnung |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4562307A1 true EP4562307A1 (de) | 2025-06-04 |
Family
ID=87245785
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP23740986.7A Pending EP4562307A1 (de) | 2022-07-25 | 2023-07-06 | Pumpenanordnung |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP4562307A1 (de) |
| KR (1) | KR20250040962A (de) |
| CN (1) | CN119630887A (de) |
| CA (1) | CA3263236A1 (de) |
| DE (1) | DE102022118510A1 (de) |
| WO (1) | WO2024022777A1 (de) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CS150462B1 (de) * | 1970-11-14 | 1973-09-04 | ||
| US4177008A (en) | 1973-01-26 | 1979-12-04 | Klein, Schanzlin & Becker Aktiengesellschaft | Centrifugal pump |
| CN203272249U (zh) | 2013-05-30 | 2013-11-06 | 哈尔滨电气动力装备有限公司 | 600mw火电站超超临界锅炉用强制循环泵的水力部件 |
-
2022
- 2022-07-25 DE DE102022118510.9A patent/DE102022118510A1/de active Pending
-
2023
- 2023-07-06 WO PCT/EP2023/068714 patent/WO2024022777A1/de not_active Ceased
- 2023-07-06 KR KR1020257002938A patent/KR20250040962A/ko active Pending
- 2023-07-06 CA CA3263236A patent/CA3263236A1/en active Pending
- 2023-07-06 CN CN202380056512.7A patent/CN119630887A/zh active Pending
- 2023-07-06 EP EP23740986.7A patent/EP4562307A1/de active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| CA3263236A1 (en) | 2025-06-10 |
| KR20250040962A (ko) | 2025-03-25 |
| DE102022118510A1 (de) | 2024-01-25 |
| WO2024022777A1 (de) | 2024-02-01 |
| CN119630887A (zh) | 2025-03-14 |
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Legal Events
| Date | Code | Title | Description |
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| STAA | Information on the status of an ep patent application or granted ep patent |
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| STAA | Information on the status of an ep patent application or granted ep patent |
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| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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| STAA | Information on the status of an ep patent application or granted ep patent |
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| 17P | Request for examination filed |
Effective date: 20250121 |
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| AK | Designated contracting states |
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| DAV | Request for validation of the european patent (deleted) | ||
| DAX | Request for extension of the european patent (deleted) | ||
| GRAP | Despatch of communication of intention to grant a patent |
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| INTG | Intention to grant announced |
Effective date: 20260304 |