EP0456596A1 - A centrifugal pump - Google Patents
A centrifugal pump Download PDFInfo
- Publication number
- EP0456596A1 EP0456596A1 EP91610041A EP91610041A EP0456596A1 EP 0456596 A1 EP0456596 A1 EP 0456596A1 EP 91610041 A EP91610041 A EP 91610041A EP 91610041 A EP91610041 A EP 91610041A EP 0456596 A1 EP0456596 A1 EP 0456596A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- web
- centrifugal pump
- segments
- cover plate
- blade means
- 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
- 239000007787 solid Substances 0.000 claims abstract description 7
- 238000003466 welding Methods 0.000 claims description 8
- 238000005476 soldering Methods 0.000 claims description 7
- 238000001125 extrusion Methods 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 5
- 230000006978 adaptation Effects 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 description 4
- 210000001331 nose Anatomy 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
Images
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
- F04D29/18—Rotors
- F04D29/22—Rotors specially for centrifugal pumps
- F04D29/2205—Conventional flow pattern
- F04D29/2222—Construction and assembly
-
- 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
- F04D29/18—Rotors
- F04D29/22—Rotors specially for centrifugal pumps
- F04D29/2205—Conventional flow pattern
- F04D29/2216—Shape, geometry
Definitions
- the invention relates to a centrifugal pump comprising a casing and a rotary impeller provided with a cover plate and a plurality of spacing blade means fastened thereto.
- DE-PS No. 2.800.723 discloses a fan impeller, where two successive blades are joined by means of a common base plate adjacent one of the two cover plates.
- Another known fan impeller comprises blades of bent sheet material. It is, however, not mentioned that the blades are made of simple web segments.
- Known impellers are expensive to manufacture, as they require a large number of working operations, especially a large number of foldings of the sheet material. Moreover, the impellers are difficult to adapt to a predetermined capacity or pressure. Further, large known pump impellers are known, which are provided with spacing blade means in the form of hollow cavities.
- the diameter of the impeller may be altered by turning, thus possibly puncturing a spacing blade means.
- the pump medium can then flow into the cavity of the spacing blade means, thus having a considerable, negative effect on the flow conditions at the outer periphery of the spacing blade means.
- the object of the invention is to provide a centrifugal pump of the above-mentioned type, where the impeller is easily adapted to a variety of different operating conditions (capacity, pressure).
- each spacing blade means radially seen, comprises an outer, solid section and an inner section having at least one cavity, the outer section forming an integral part with the inner section or being joined therewith.
- the impeller is easily adapted to the desired operating conditions (capacity, pressure) without affecting the flow conditions at the outer periphery of the impeller, because a slight adaptation of the blade diameter by turning only results in removing material from the outer, solid section but not from the hollow section. The latter remains undamaged, and the flow conditions in the pump are consequently excellent.
- the outer section is without connection to the cover plate.
- it is particularly easy to remove material from the outer section during adaptation.
- the outer and inner sections form an integral part and comprise at least one first curved web segment, preferably two such segments, to define ducts between the spacing blade means, one portion of the first web segment or of one of the web segments, respectively, of each spacing blade means radially projecting further than the remaining portion of the first web segment or of the other web segments, respectively, of the spacing blade means, the projecting part of the above-mentioned portion of the first web segment or of one of the web segments, respectively, being without any connection to the cover plate.
- the web segment with the longest radial projection advantageously extends not quite as far as the cover plate.
- each spacing blade means comprises at least three relatively small web segments defining at least one closed cavity, resulting in a relatively light impeller. Moreover, it is thus easier to shape a spacing blade means in such a way that the pump medium flows into the duct between two successive spacing blade means at an easily adjustable angle.
- one or more of the web segments of the inner section form an internal bracing therein, thus increasing the strength of the impeller.
- the web segments are manufactured with a small cross-section by means of extrusion, resulting in a particularly inexpensive manufacture of the impeller.
- the cover plate and the web segments are made of sheet metal, preferably having a thickness of 0.5-3.0 mm, especially 0.8-2.0 mm, thus facilitating manufacture.
- the end portion of the inner section comprised by the web segment or segments and closest to the centre of the impeller is provided with an inwardly facing nose, optionally only a single projection of the web segment, to ensure a locally defined extension of the cross-section of the duct immediately behind the duct inlet with respect to the flow direction of the pump medium through the duct, thus allowing for the most advantageous design of a duct inlet.
- the web segments are substantially of C-, S- or wing-shape.
- An especially reliable fasting of the blades is, according to the invention, obtained by the web segment or segments of a spacing blade means being fastened to the cover plate by welding or soldering spots at a radius smaller than or equal to 0.85 R, R being the radius of the cover plate.
- each web segment is fastened with two, preferably four, welding or soldering spots.
- the impeller of Figure 1 rotates inside a casing of a centrifugal pump (not shown).
- the impeller is provided with one cover plate 8 but may, in principle, be provided with two.
- the impeller is further provided with a plurality of spacing blade means 2, a pair of spacing blade means defining a duct 4.
- Each spacing blade means 2 comprises an outer, solid section 2b′ and an inner, hollow section, i.e. the section of the spacing blade means 2 situated radially inwardly with respect to the outer section 2b′.
- the outer, solid section 2b′ (cf. also 2b o ) may form an integral part with the inner section or may be joined with the latter.
- the outer section 2b′ (optionally 2b o ) is thus not directly connected to the cover plate 8.
- each inner section may comprise two web segments 2a, 2b.
- the web segments may be fastened to the cover plate by means of welding, preferably spot welding, or soldering.
- each inner section comprises at least one inner closed cavity 6.
- the web segment 2b extends as far as the outer peripheral edge 8a of the cover plate 8.
- a technician assembling the impeller parts can easily shorten the outer section 2b′ of the web segment 2b to a greater or lesser extent by means of a simple cutting tool, thus adapting the impeller to a variety of operating conditions.
- the inner section may be provided with inwardly facing noses, in the present case the radially innermost end 2b ⁇ of the web segment 2b.
- the portion of the duct 4 forming the duct inlet is locally extended 25, thus creating particularly advantageous flow conditions through the duct 4 in some pump types.
- a web segment may optionally extend over a considerable distance, as denoted by 2b o at the bottom left corner of Figure 1, without, however, reaching the peripheral edge 8a of the cover plate.
- a spacing blade means may comprise three web segments, as shown at the bottom right corner of Figure 1, where a web segment 2c forms a bracing.
- the web segment 2a at the top of Figure 1 may optionally be two web segments adjoining at a bend 15.
- a spacing blade means 12 may comprise two web segments, cf. Figure 2, one of which 12f is substantially of C-shape, the other 12g substantially of S-shape.
- a spacing blade means may have the shape of an airplane wing made from one web segment, cf. 12h.
- a spacing blade means may be made from a single web segment provided with an inwardly facing nose 12m ⁇ , cf. 12m.
- a web segment may be manufactured with a small cross-section by means of extrusion. It is also possible to make the segments and the cover plate of sheet metal having a thickness of preferably 0.5-3.0 mm, especially 0.8-2.0 mm.
- the web segment of a spacing blade means may be fastened to the cover plate by means of welding or soldering spots 20 and within a radius of less than or equal to 0.85 R (R being the radius of the cover plate).
- a web segment may be fastened with at least two, preferably four, welding or soldering spots 20.
- the invention may be varied in many ways without thereby deviating from the scope of the invention.
- the web segments may, for instance, be cast with the cover plate.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
Description
- The invention relates to a centrifugal pump comprising a casing and a rotary impeller provided with a cover plate and a plurality of spacing blade means fastened thereto.
- DE-PS No. 2.800.723 discloses a fan impeller, where two successive blades are joined by means of a common base plate adjacent one of the two cover plates. Another known fan impeller comprises blades of bent sheet material. It is, however, not mentioned that the blades are made of simple web segments. Known impellers are expensive to manufacture, as they require a large number of working operations, especially a large number of foldings of the sheet material. Moreover, the impellers are difficult to adapt to a predetermined capacity or pressure. Further, large known pump impellers are known, which are provided with spacing blade means in the form of hollow cavities. When the operating conditions (capacity, pressure) of a pump with such an impeller change, the diameter of the impeller may be altered by turning, thus possibly puncturing a spacing blade means. The pump medium can then flow into the cavity of the spacing blade means, thus having a considerable, negative effect on the flow conditions at the outer periphery of the spacing blade means.
- The object of the invention is to provide a centrifugal pump of the above-mentioned type, where the impeller is easily adapted to a variety of different operating conditions (capacity, pressure).
- The centrifugal pump according to the invention is characterized in that each spacing blade means, radially seen, comprises an outer, solid section and an inner section having at least one cavity, the outer section forming an integral part with the inner section or being joined therewith. As a result the impeller is easily adapted to the desired operating conditions (capacity, pressure) without affecting the flow conditions at the outer periphery of the impeller, because a slight adaptation of the blade diameter by turning only results in removing material from the outer, solid section but not from the hollow section. The latter remains undamaged, and the flow conditions in the pump are consequently excellent.
- According to the invention, the outer section is without connection to the cover plate. Thus, it is particularly easy to remove material from the outer section during adaptation.
- Furthermore, according to the invention, the outer and inner sections form an integral part and comprise at least one first curved web segment, preferably two such segments, to define ducts between the spacing blade means, one portion of the first web segment or of one of the web segments, respectively, of each spacing blade means radially projecting further than the remaining portion of the first web segment or of the other web segments, respectively, of the spacing blade means, the projecting part of the above-mentioned portion of the first web segment or of one of the web segments, respectively, being without any connection to the cover plate. As a result, it is particularly easy to adapt an impeller to the desired operating conditions (capacity, pressure) after manufacture, as a technician can easily shorten the web segment(s) a little at the outer periphery by means of a simple cutting tool so that the impeller is adapted without affecting the flow conditions at the outer periphery of the impeller.
- Moreover, according to the invention, the web segment with the longest radial projection advantageously extends not quite as far as the cover plate.
- In one embodiment of the invention each spacing blade means comprises at least three relatively small web segments defining at least one closed cavity, resulting in a relatively light impeller. Moreover, it is thus easier to shape a spacing blade means in such a way that the pump medium flows into the duct between two successive spacing blade means at an easily adjustable angle.
- In another embodiment of the invention, one or more of the web segments of the inner section form an internal bracing therein, thus increasing the strength of the impeller.
- In a further embodiment of the invention, the web segments are manufactured with a small cross-section by means of extrusion, resulting in a particularly inexpensive manufacture of the impeller.
- In yet another embodiment of the invention, the cover plate and the web segments are made of sheet metal, preferably having a thickness of 0.5-3.0 mm, especially 0.8-2.0 mm, thus facilitating manufacture.
- In yet a further embodiment of the invention the end portion of the inner section comprised by the web segment or segments and closest to the centre of the impeller is provided with an inwardly facing nose, optionally only a single projection of the web segment, to ensure a locally defined extension of the cross-section of the duct immediately behind the duct inlet with respect to the flow direction of the pump medium through the duct, thus allowing for the most advantageous design of a duct inlet.
- In a particularly advantageous embodiment of the invention, the web segments are substantially of C-, S- or wing-shape.
- An especially reliable fasting of the blades is, according to the invention, obtained by the web segment or segments of a spacing blade means being fastened to the cover plate by welding or soldering spots at a radius smaller than or equal to 0.85 R, R being the radius of the cover plate.
- In another advantageous embodiment of the invention each web segment is fastened with two, preferably four, welding or soldering spots.
- Finally, the web segments according to the invention are cast with the cover plate.
- The invention is described in greater detail below and with reference to the accompanying drawings in which:
- Figure 1 is a frontal view of a first embodiment of an impeller of a centrifugal pump according to the invention, where the impeller is provided with one cover plate,
- Figure 2 shows a second embodiment of the impeller corresponding to Figure 1, where spacing blade means of different shapes are schematically shown; an impeller according to the invention is, however, always provided with spacing blade means of the same shape; and
- Figure 3 is a sectional view of the impeller of Figure 1 along the line III-III.
- The impeller of Figure 1 rotates inside a casing of a centrifugal pump (not shown). The impeller is provided with one
cover plate 8 but may, in principle, be provided with two. The impeller is further provided with a plurality of spacing blade means 2, a pair of spacing blade means defining aduct 4. Each spacing blade means 2 comprises an outer,solid section 2b′ and an inner, hollow section, i.e. the section of the spacing blade means 2 situated radially inwardly with respect to theouter section 2b′. The outer,solid section 2b′ (cf. also 2bo) may form an integral part with the inner section or may be joined with the latter. Theouter section 2b′ (optionally 2bo) is thus not directly connected to thecover plate 8. If the outer and inner sections form an integral part, they may comprise twoweb segments cavity 6. - As is furthermore apparent, the
web segment 2b extends as far as the outerperipheral edge 8a of thecover plate 8. A technician assembling the impeller parts can easily shorten theouter section 2b′ of theweb segment 2b to a greater or lesser extent by means of a simple cutting tool, thus adapting the impeller to a variety of operating conditions. Moreover it is apparent that the inner section may be provided with inwardly facing noses, in the present case the radiallyinnermost end 2b˝ of theweb segment 2b. As a result the portion of theduct 4 forming the duct inlet is locally extended 25, thus creating particularly advantageous flow conditions through theduct 4 in some pump types. - Prior to the above-mentioned cutting with a tool, a web segment may optionally extend over a considerable distance, as denoted by 2bo at the bottom left corner of Figure 1, without, however, reaching the
peripheral edge 8a of the cover plate. - Instead of two web segments a spacing blade means may comprise three web segments, as shown at the bottom right corner of Figure 1, where a
web segment 2c forms a bracing. Theweb segment 2a at the top of Figure 1 may optionally be two web segments adjoining at abend 15. - A spacing blade means 12 may comprise two web segments, cf. Figure 2, one of which 12f is substantially of C-shape, the other 12g substantially of S-shape. Optionally a spacing blade means may have the shape of an airplane wing made from one web segment, cf. 12h. Furthermore a spacing blade means may be made from a single web segment provided with an inwardly facing
nose 12m˝, cf. 12m. - A web segment may be manufactured with a small cross-section by means of extrusion. It is also possible to make the segments and the cover plate of sheet metal having a thickness of preferably 0.5-3.0 mm, especially 0.8-2.0 mm.
- As is shown by means of the
web segment 2b of Figure 1, the web segment of a spacing blade means may be fastened to the cover plate by means of welding or solderingspots 20 and within a radius of less than or equal to 0.85 R (R being the radius of the cover plate). A web segment may be fastened with at least two, preferably four, welding orsoldering spots 20. - The invention may be varied in many ways without thereby deviating from the scope of the invention. The web segments may, for instance, be cast with the cover plate.
Claims (13)
- A centrifugal pump comprising a casing and a rotary impetter (1) provided with a cover plate (8) and a plurality of spacing blade means (2) fastened thereto, characterized in that each spacing blade means, radially seen, comprises an outer, solid section (2b′, 2bo) and an inner section having at least one cavity (16, 17), the outer section forming an integrat part with the inner section or being joined therewith.
- A centrifugal pump as claimed in claim 1, characterized by the outer section (2b′, 2bo) being without connection to the cover plate (8).
- A centrifugal pump as claimed in claim 1, characterized by the outer and inner sections forming an integral part and comprising at least one first curved web segment (12m, 12h), preferably two such segments (2a, 2b; 2c; 12f, 12g, 12j, 12k), to define ducts (4) between the spacing blade means, one portion (2b′) of the first web segment or of one of the web segments (2b), respectively, of each spacing blade means radially projecting further than the remaining portion of the first web segment or of the other web segments, respectively, of the spacing blade means, the projecting part of the above-mentioned portion (2b′) of the first web segment or of one of the web segments, respectively, being without any connection to the cover plate.
- A centrifugal pump as claimed in claim 1 or 3, characterized by the web segment (2bo) with the longest radial projection extending not quite as far as the cover plate (8).
- A centrifugal pump as claimed in claim 2, 3 or 4, characterized by each spacing blade means (2) comprising at least three relatively small web segments (2a, 2b, 2c) defining at least one closed cavity (16, 17).
- A centrifugal pump as claimed in one or more of the claims 1-5, characterized by one or more of the web segments of the inner section forming an internal bracing (2c) therein.
- A centrifugal pump as claimed in one or more of the claims 1-6, characterized by the web segments being manufactured with a small cross-section by means of extrusion.
- A centrifugal pump as claimed in one or more of the claims 1-7, characterized by the cover plate and the web segments being made of sheet metal, preferably having a thickness of 0.5-3.0 mm, especially 0.8-2.0 mm.
- A centrifugal pump as claimed in one or more of the claims 1-8, characterized by the end portion (2) of the inner section comprised by the web segment (2m) or segments (2b, 2f, 2k) and closest to the centre (10) of the impeller being provided with an inwardly facing nose (12m˝), optionally only a single projection (2b˝) of the web segment, to ensure a locally defined extension (34, 25) of the cross-section of the duct immediately behind the duct inlet with respect to the flow direction of the pump medium through the duct.
- A centrifugal pump as claimed in one or more of the claims 1-9, characterized by the web segments being substantially of C-, S- or wing-shape (12f, 12g, 12h, 12j, 12k, 12m).
- A centrifugal pump as claimed in one or more of the claims 1-10, characterized by the web segment or segments of a spacing blade means being fastened to the cover plate by welding or soldering spots (20) at a radius smaller than or equal to 0.85 R, R being the radius of the cover plate.
- A centrifugal pump as claimed in claim 10, characterized by two, preferably four, welding or soldering spots (20) for fastening a web segment.
- A centrifugal pump as claimed in one or more of the claims 1-12, characterized by the web segments being cast with the cover plate.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DK117290A DK164135C (en) | 1990-05-10 | 1990-05-10 | centrifugal |
DK1172/90 | 1990-05-10 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0456596A1 true EP0456596A1 (en) | 1991-11-13 |
EP0456596B1 EP0456596B1 (en) | 1995-09-06 |
Family
ID=8101811
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19910610041 Expired - Lifetime EP0456596B1 (en) | 1990-05-10 | 1991-05-06 | A centrifugal pump |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0456596B1 (en) |
DE (1) | DE69112701T2 (en) |
DK (1) | DK164135C (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20140078856A1 (en) * | 2012-09-17 | 2014-03-20 | Jorge O. Arribau | Tub blender pressure booster method and apparatus |
CN107100887A (en) * | 2017-06-30 | 2017-08-29 | 马鞍山方圆动力科技有限公司 | A kind of novel impeller |
WO2018114143A1 (en) * | 2016-12-21 | 2018-06-28 | KSB SE & Co. KGaA | Vortex pump |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104613003B (en) * | 2014-11-26 | 2017-05-03 | 江苏大学 | Hydraulic design method for low-specific-speed overload-free centrifugal pump impeller |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1030561A (en) * | 1910-09-02 | 1912-06-25 | Ernest E Blackmer | Fan. |
FR1139152A (en) * | 1955-01-14 | 1957-06-26 | Babcock & Wilcox France | Changeable rotor for radial fan |
US4874293A (en) * | 1988-11-08 | 1989-10-17 | Gutzwiller H Leslie | Modified centrifugal airfoil fan wheel |
-
1990
- 1990-05-10 DK DK117290A patent/DK164135C/en not_active IP Right Cessation
-
1991
- 1991-05-06 DE DE1991612701 patent/DE69112701T2/en not_active Expired - Fee Related
- 1991-05-06 EP EP19910610041 patent/EP0456596B1/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1030561A (en) * | 1910-09-02 | 1912-06-25 | Ernest E Blackmer | Fan. |
FR1139152A (en) * | 1955-01-14 | 1957-06-26 | Babcock & Wilcox France | Changeable rotor for radial fan |
US4874293A (en) * | 1988-11-08 | 1989-10-17 | Gutzwiller H Leslie | Modified centrifugal airfoil fan wheel |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20140078856A1 (en) * | 2012-09-17 | 2014-03-20 | Jorge O. Arribau | Tub blender pressure booster method and apparatus |
US9168496B2 (en) * | 2012-09-17 | 2015-10-27 | Nov Condor, Llc | Tub blender pressure booster method and apparatus |
WO2018114143A1 (en) * | 2016-12-21 | 2018-06-28 | KSB SE & Co. KGaA | Vortex pump |
US11187232B2 (en) | 2016-12-21 | 2021-11-30 | KSB SE & Co. KGaA | Vortex pump |
CN107100887A (en) * | 2017-06-30 | 2017-08-29 | 马鞍山方圆动力科技有限公司 | A kind of novel impeller |
Also Published As
Publication number | Publication date |
---|---|
DE69112701T2 (en) | 1996-03-21 |
DK117290D0 (en) | 1990-05-10 |
DE69112701D1 (en) | 1995-10-12 |
DK164135C (en) | 1992-10-12 |
DK117290A (en) | 1991-11-11 |
EP0456596B1 (en) | 1995-09-06 |
DK164135B (en) | 1992-05-11 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP0980979B1 (en) | Air supplying device | |
JP3481970B2 (en) | High efficiency, low axial profile, low noise axial fan | |
US6220819B1 (en) | Centrifugal pump impeller | |
US6368062B1 (en) | Turbo fan for range hood and range hood storing turbo fan | |
EP0293277B1 (en) | Fan with motor cooling and enhancement | |
KR900018607A (en) | Centrifugal blower with cover | |
JP5425192B2 (en) | Propeller fan | |
EP0456596A1 (en) | A centrifugal pump | |
KR980002889A (en) | Method for manufacturing backflow fan, fan coma molding machine and pan mocha molding machine | |
JP3077863B2 (en) | Propeller fan and air conditioner equipped with the same | |
JPS5921098U (en) | Fluid machinery such as fans and compressors | |
US20050074332A1 (en) | Fan inlet plate and method | |
JPS61101698A (en) | Propeller fan | |
EP1411248B1 (en) | Impeller for centrifugal fan and centrifugal fan equipped with the same | |
JP3004474B2 (en) | Axial rotating machine | |
JP2003090279A (en) | Hydraulic rotating machine vane | |
JPH01247797A (en) | Fan | |
US5149997A (en) | Fan for an electrically operated machine | |
KR100265648B1 (en) | Method for manufacturing blade impeller and blade impeller manufactured by such method | |
JP5925376B1 (en) | Cross-flow fan and air conditioner indoor unit | |
US851457A (en) | Centrifugal fan. | |
US2987172A (en) | Fan rotor and method of manufacturing same | |
GB2064668A (en) | Fan Blade | |
JP4649146B2 (en) | Propeller fan | |
KR20200142231A (en) | Axial flow Fan |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): DE FR GB IT |
|
17P | Request for examination filed |
Effective date: 19920409 |
|
17Q | First examination report despatched |
Effective date: 19930706 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
ITF | It: translation for a ep patent filed | ||
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): DE FR GB IT |
|
REF | Corresponds to: |
Ref document number: 69112701 Country of ref document: DE Date of ref document: 19951012 |
|
ET | Fr: translation filed | ||
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
26N | No opposition filed | ||
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 20000530 Year of fee payment: 10 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 20000602 Year of fee payment: 10 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20000706 Year of fee payment: 10 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20010506 |
|
GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 20010506 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20020131 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20020301 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED. Effective date: 20050506 |