EP0122726A1 - Fluid contacting surfaces and devices incorporating such surfaces - Google Patents
Fluid contacting surfaces and devices incorporating such surfaces Download PDFInfo
- Publication number
- EP0122726A1 EP0122726A1 EP84301804A EP84301804A EP0122726A1 EP 0122726 A1 EP0122726 A1 EP 0122726A1 EP 84301804 A EP84301804 A EP 84301804A EP 84301804 A EP84301804 A EP 84301804A EP 0122726 A1 EP0122726 A1 EP 0122726A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- axis
- fluid
- impeller
- propeller
- contacting surface
- 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
- 239000012530 fluid Substances 0.000 title claims description 16
- 230000003247 decreasing effect Effects 0.000 claims abstract description 6
- 230000007423 decrease Effects 0.000 claims description 3
- 238000007493 shaping process Methods 0.000 description 3
- 230000000295 complement effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000010408 sweeping Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H1/00—Propulsive elements directly acting on water
- B63H1/02—Propulsive elements directly acting on water of rotary type
- B63H1/12—Propulsive elements directly acting on water of rotary type with rotation axis substantially in propulsive direction
- B63H1/14—Propellers
- B63H1/26—Blades
-
- 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
- F04D29/181—Axial flow rotors
Definitions
- This invention relates to fluid-contacting surfaces and devices incorporating such surfaces, and more particularly relates to fluid-contacting surfaces and devices which are arranged to affect, modify or control the flow of fluids, as for example the fluid-contacting surfaces of stationary deflectors or rotatable devices such as turbines, impellers or propellers and the like which may be used for a variety of purposes and applications e.g. as in pneumatic and hydraulic applications.
- Another object of this invention is to provide a fluid-contacting surface and/or device incorporating at least one such surface, which may have special purpose applications and provide more effective fluid flow control than at least many conventionally formed fluid-contacting surfaces and devices.
- a fluid-contacting surface comprises at least a part of that surface cenerated by a generating line extending radially from a point of origin on an axis and rotated about said axis from a said point of origin and radially position so asto sweep through a decreasing angle relative to the axis as rotation takes place.
- statienary fluid deflector incorporating the fluid-contacting surface cenerated according to the preceding clair.
- an axial flow fluid impeller or propeller incorporating at least one fluid-contacting surface generated as aforesaid.
- the invention further includes the methods of forcing the said generating surface and the said stationary deflector and/or axial flow fluid irpeller or propeller.
- FIG. 1 of the drawings this diagrammatically illustrates how a fluid-contacting surface in accordance with the present invention may be generated about a point or origin O of an axis of rotation %.
- a generatrix point P defines a radius vector OP
- transverse axis X extends at right angles to the axis of rotation 8 and the angle ⁇ is formed between the X axis and the projection OQ of the radius vector OP onto the XY plane, with the angle being formed between the radius vector OP and the XY plane.
- the parametric equations defining the curve generated by the point P are: and Either of the augles ⁇ and z may be eliminated from the equations by expressing it as a function of the other.
- the fluid-contacting surface in accordance with this invention is any part of that surface generated by the radius vector or generating line OP rotated about the axis a from the point of origin and swept between the transverse axis X through a decreasing angle to lie adjacent and parallel the axis Z.
- the surface may include the full 900 sweep between the transverse axis X and the true axis of rotation Z or a part thereof, or the full 180 0 sweep from adjacent the axis Z to one side of the point of origin O through the transverse axis X to lie adjacent the axis Z at the opposite side of the point of origin O; and the surface thus formed may be duplicated or otherwise multiplied in providing a plurality of similar fluid-contacting surfaces in continuous or spaced relationship about the axis of rotation Z e.g. as in providing fluid-contacting surfaces on a twin or multi bladed impeller or propeller.
- the angle through which the radius vector or generating line OP is swept and the angle of rotation about the axis may be unrelated or each may be a function of the other such as, for example, directly proportional, according to the use to which the fluid-contacting surface is to be put.
- the variance in the angle through which the generating line OP is swept may be unrelated or directly proportional to the speed of rotation of the line OP about the axis Z.
- the generating line OP can remain of constant length throughout its rotational and angular sweep relative to the axis Z, so that the said surface, and any impeller or propeller blade formed thereby or incorporating such surface, may be swept through an imaginary sphere or spheroidal form, or the length of the generating line OP can be varied as it is swept through its prescribed angle and rotated about the axis a from its point of origin O in forming a fluid-contacting surface or device incorporating such surface arranged to sweep through an alternative required form as hereinafter described.
- the rotatable impeller or propeller may be constructed with a blade 1 formed from such as a thin sheet of metal or other suitable material in initially flat circular disc form of radius equal to the length of the generating line OP and provided with either a single radial slit S or a small sector R,R' cut out, as illustrated by way of example in figure 5 of the drawings; and the whole or part disc form may then be twisted and bent into shape with the radial slit (or sector) edges R, R' disposed in opposition 180° apart to lie on or adjacent the axis of rotation Z of the impeller or propeller.
- the slit S between the radial edges R, R' of the blade 1 may be a width such that is is substantially equal to the diameter of an axial shaft 2 for the impeller or propeller and to which the said radial edges R,R' can be secured such as by welding.
- Conventional screw type impellers or propellers are formed with at least the inner parts of their fluid-contacting surfaces as a true helix or substantially a true helix about the axis of rotation, with such helix being maintained perpendicular to the axis as it progresses longitudinally thereof; and many propellers are provided with a further helical twist along their radial axes towards their outer periphery.
- the blade is simply spirally formed from one point of origin O on the axis of rotation Z so that from the one medial position on the transverse axis X where the fluid-contacting surface generating line OP is disposed perpendicular to the axis of rotation Z, either side of such perpendicular position the angle of inclination ⁇ relative to the axis Z progressively decreases as it approaches the axis of rotation a until it is positioned parallel and adjacent thereto i.e. adjacent the longitudinal surface of the axially-disposed shaft 2.
- radial lines 3 represent equal increments of the angle ⁇ of figure 1 and the dashed lines 4 join sample points of equal displacement from the plane of the X and Y axes.
- a twin bladed impeller or propeller is provided with a different pitch and consequential different shape formed as a result of each blade 1' being constructed from thin sheet metal initially of disc form as before but with a relatively large segment S' cut out between radial edges R and R', as shown in figure 10.
- the blades 1' will sweep through an imaginary sphere A.
- the invention is not confined to impellers or propellers in which the fluid-contacting surface generating line OP is constant, but by varying the length of such line (e.g. by a gradual increase to a peak followed by a gradual decrease) during formation of the impeller, or by subsequent shaping of the impeller blades once initially forced as before described, impellers or propellers of different shapes and sweeping different shaped volumes can be provided to meet the desired situations.
- the impeller blades I' can be shaped so that on rotation a substantially cylindrical volume may be swept as indicated in chain dot outline B in figure 7, or the blades 1' may be shaped so that an ellipsoidal form C is swept by the impeller blades.
- the basic spheroidal form may be in the main applicable to the medial part of the impeller or propeller, but segments of the sphere or spheroidal form at the opposite axial ends may be cut off, or the longitudinal axis of the impeller or propeller substantially shortened relative to the true diameter.
- a twin bladed impeller or propeller may be provided which is substantially similar to the impeller or propeller previously described with reference to figures 6 to 10 of the drawings, except that in this arrangement whilst the two blades 1'' are similarly formed from a thin flat disc arrangement, on assembly or prior to assembly axial end portions are cut out at T to more particularly separate the blades 1'' at che shaft 2'' each side of the medial portion 1''a
- impellers and impeller blades formed as aforedescribed in accordance with this invention have shown that in many instances and on rotation in one direction the formed impellers will give a far more concentrated axial thrust than conventional impellers or similar overall size, similarly powered, and rotated at the same revolutions.
- the invention thus hac particular applications in the construction of small and large air circulation, cooling and ventilating fans and the like; and it is further expected that the invention will have useful applications in marine propulsion for boats and the like, and/or the impelling or pumping of various kinds of fluids, and possibly further have aeronautical applications.
- the invention particularly lends itself to simplification of manufacture utilising sheet materials, but it will be appreciated that theinvention is not confined in this respect and that the impeller, propeller or other blades or deflectors incorporating the fluid-contacting surface or surfaces in accordance with the invention can be manufactured and formed by other means.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Ocean & Marine Engineering (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
- Hydraulic Turbines (AREA)
Abstract
Description
- This invention relates to fluid-contacting surfaces and devices incorporating such surfaces, and more particularly relates to fluid-contacting surfaces and devices which are arranged to affect, modify or control the flow of fluids, as for example the fluid-contacting surfaces of stationary deflectors or rotatable devices such as turbines, impellers or propellers and the like which may be used for a variety of purposes and applications e.g. as in pneumatic and hydraulic applications.
- Conventional design of the fluid-contacting surfaces of such as impellers, propellers and like devices can be quite complex and involve relatively high design and production costs for such devices. It is accordingly an object of the present invention to provide an alternative means for generating or forming a fluid-contacting surface, and a device incorporating at least one such surface, in a relatively simple but effective and efficient manner.
- Another object of this invention is to provide a fluid-contacting surface and/or device incorporating at least one such surface, which may have special purpose applications and provide more effective fluid flow control than at least many conventionally formed fluid-contacting surfaces and devices.
- Other and more particular objects and advantages of the present invention will become apparent from the ensuing description.
- According to one aspect of this invention therefor, a fluid-contacting surface comprises at least a part of that surface cenerated by a generating line extending radially from a point of origin on an axis and rotated about said axis from a said point of origin and radially position so asto sweep through a decreasing angle relative to the axis as rotation takes place.
- In another aspect of the invention, there is provided a statienary fluid deflector incorporating the fluid-contacting surface cenerated according to the preceding clair.
- In a further aspect of the invention, there is provided an axial flow fluid impeller or propeller incorporating at least one fluid-contacting surface generated as aforesaid.
- The invention further includes the methods of forcing the said generating surface and the said stationary deflector and/or axial flow fluid irpeller or propeller.
- Some preferred aspects of the invention will now be described by way of example and with reference to the accompanying drawings, in which:
- FIGURE 1: is a diagram illustrating the principles involved in generating a fluid-contacting surface in accordance with the invention
- FIGURE 2: is an axial or end view of a first form of an impeller or propeller blade formed in accordance with the invention
- FIGURE 3: is a view in the direction of arrows III-III of figure 2
- FIGURE 4: is a view in the direction of arrows IV-IV of figure 2
- FIGURE 5: is an axial view of a blade part for forming the impeller or propeller of figures 2, 3 and 4, illustrated in a flat form prior to shaping
- FIGURE 6: is a perspective view of another form of the impeller cr propeller form in accordance with the invention
- FIGURE 7: is a side view in the direction of arrow VII of figure 6
- FIGURE E: is a side view in the direction of arrow VIII of figure 6
- FIGURE 9: is an axial or end view of the arrangement of figure 6 as viewed in the direction of arrow IX
- FIGURE 10: is an axial view of one blade part for forming the impeller or propeller of figures 6 to 9 inclusive, illustrated in the flat form prior to shaping
- FIGURE 11: is a side view of a further impeller or propeller similar to but including a modification of the impeller of figures 6 through to 9, and
- FIGURE 12: is a view in the direction of arrows XII-XII of figure 11.
- Referring firstly to figure 1 of the drawings, this diagrammatically illustrates how a fluid-contacting surface in accordance with the present invention may be generated about a point or origin O of an axis of rotation %. A generatrix point P defines a radius vector OP, transverse axis X extends at right angles to the axis of rotation 8 and the angle β is formed between the X axis and the projection OQ of the radius vector OP onto the XY plane, with the angle being formed between the radius vector OP and the XY plane. The parametric equations defining the curve generated by the point P are:
- As seen, in the XYZ co-ordinate system the point of origin O is at the intersection or point of origin of the three co-ordinate axes, and with the angle between the true axis of rotation Z and radius vector OP referred to as θ, the fluid-contacting surfaces generated in accordance with this invention is defined as the locus of the generatrix line OP where θ=f(β) i.e. is some function of the angle β. For example, where
- Simply put, the fluid-contacting surface in accordance with this invention, is any part of that surface generated by the radius vector or generating line OP rotated about the axis a from the point of origin and swept between the transverse axis X through a decreasing angle to lie adjacent and parallel the axis Z. The surface may include the full 900 sweep between the transverse axis X and the true axis of rotation Z or a part thereof, or the full 1800 sweep from adjacent the axis Z to one side of the point of origin O through the transverse axis X to lie adjacent the axis Z at the opposite side of the point of origin O; and the surface thus formed may be duplicated or otherwise multiplied in providing a plurality of similar fluid-contacting surfaces in continuous or spaced relationship about the axis of rotation Z e.g. as in providing fluid-contacting surfaces on a twin or multi bladed impeller or propeller.
- The angle through which the radius vector or generating line OP is swept and the angle of rotation about the axis may be unrelated or each may be a function of the other such as, for example, directly proportional, according to the use to which the fluid-contacting surface is to be put. Similarly the variance in the angle through which the generating line OP is swept may be unrelated or directly proportional to the speed of rotation of the line OP about the axis Z.
- Further, it is envisaged that the generating line OP can remain of constant length throughout its rotational and angular sweep relative to the axis Z, so that the said surface, and any impeller or propeller blade formed thereby or incorporating such surface, may be swept through an imaginary sphere or spheroidal form, or the length of the generating line OP can be varied as it is swept through its prescribed angle and rotated about the axis a from its point of origin O in forming a fluid-contacting surface or device incorporating such surface arranged to sweep through an alternative required form as hereinafter described.
- Referring now to figures 2, 3 and 4, the rotatable impeller or propeller may be constructed with a
blade 1 formed from such as a thin sheet of metal or other suitable material in initially flat circular disc form of radius equal to the length of the generating line OP and provided with either a single radial slit S or a small sector R,R' cut out, as illustrated by way of example in figure 5 of the drawings; and the whole or part disc form may then be twisted and bent into shape with the radial slit (or sector) edges R, R' disposed in opposition 180° apart to lie on or adjacent the axis of rotation Z of the impeller or propeller. - In constructing the impeller or propeller in this manner, the slit S between the radial edges R, R' of the
blade 1 may be a width such that is is substantially equal to the diameter of anaxial shaft 2 for the impeller or propeller and to which the said radial edges R,R' can be secured such as by welding. - Conventional screw type impellers or propellers are formed with at least the inner parts of their fluid-contacting surfaces as a true helix or substantially a true helix about the axis of rotation, with such helix being maintained perpendicular to the axis as it progresses longitudinally thereof; and many propellers are provided with a further helical twist along their radial axes towards their outer periphery. It will be seen that in the present invention there is a substantial difference in construction in that the blade is simply spirally formed from one point of origin O on the axis of rotation Z so that from the one medial position on the transverse axis X where the fluid-contacting surface generating line OP is disposed perpendicular to the axis of rotation Z, either side of such perpendicular position the angle of inclination θ relative to the axis Z progressively decreases as it approaches the axis of rotation a until it is positioned parallel and adjacent thereto i.e. adjacent the longitudinal surface of the axially-disposed
shaft 2. - In this form of the invention, a pitch value of n = 2 has been selected, with the result that the
blade 1 curves tightly into the main a::is of rotation B of the impeller or propeller. In figure 2, radial lines 3 represent equal increments of the angle β of figure 1 and the dashed lines 4 join sample points of equal displacement from the plane of the X and Y axes. - In this arrangement, with rotation of the impeller and shaft about axis Z a positive axial thrust on the fluid is exerted by the fluid-contacting surface of the
blade 1 for efficient and effective operation either in moving the fluid coaxially or moving such as an aeroplane or boat relative to the respective fluid (air or water) in which it is located. - The arrangement shown in figures 2,3 and 4 illustrate a single blade, but a complementary second blade can be provided and mounted in complementary diametric opposition, as shown in broken outline; and it will be seen also that on rotation the
blade 1 orblades 1 will sweep through an imaginary sphere A as indicated in broken outline in figure 4. - Referring now to figures 6 to 10 of the accompanying drawings, a twin bladed impeller or propeller is provided with a different pitch and consequential different shape formed as a result of each blade 1' being constructed from thin sheet metal initially of disc form as before but with a relatively large segment S' cut out between radial edges R and R', as shown in figure 10.
- Again and with the two blades 1' and their common shaft 2' rotated about the said axis Z, the blades 1' will sweep through an imaginary sphere A. It will be appreciated however that the invention is not confined to impellers or propellers in which the fluid-contacting surface generating line OP is constant, but by varying the length of such line (e.g. by a gradual increase to a peak followed by a gradual decrease) during formation of the impeller, or by subsequent shaping of the impeller blades once initially forced as before described, impellers or propellers of different shapes and sweeping different shaped volumes can be provided to meet the desired situations. For example, the impeller blades I' can be shaped so that on rotation a substantially cylindrical volume may be swept as indicated in chain dot outline B in figure 7, or the blades 1' may be shaped so that an ellipsoidal form C is swept by the impeller blades. In other variations the basic spheroidal form may be in the main applicable to the medial part of the impeller or propeller, but segments of the sphere or spheroidal form at the opposite axial ends may be cut off, or the longitudinal axis of the impeller or propeller substantially shortened relative to the true diameter.
- Referring now to figures 11 and 12 of the acccompanying drawings, a twin bladed impeller or propeller may be provided which is substantially similar to the impeller or propeller previously described with reference to figures 6 to 10 of the drawings, except that in this arrangement whilst the two blades 1'' are similarly formed from a thin flat disc arrangement, on assembly or prior to assembly axial end portions are cut out at T to more particularly separate the blades 1'' at che shaft 2'' each side of the medial portion 1''a
- Experiments with impellers and impeller blades formed as aforedescribed in accordance with this invention have shown that in many instances and on rotation in one direction the formed impellers will give a far more concentrated axial thrust than conventional impellers or similar overall size, similarly powered, and rotated at the same revolutions. The invention thus hac particular applications in the construction of small and large air circulation, cooling and ventilating fans and the like; and it is further expected that the invention will have useful applications in marine propulsion for boats and the like, and/or the impelling or pumping of various kinds of fluids, and possibly further have aeronautical applications.
- As before indicated, the invention particularly lends itself to simplification of manufacture utilising sheet materials, but it will be appreciated that theinvention is not confined in this respect and that the impeller, propeller or other blades or deflectors incorporating the fluid-contacting surface or surfaces in accordance with the invention can be manufactured and formed by other means.
- Particular forms of the invention and its applications have been described only by way of example with reference to the accompanying drawings, and it will be appreciated that other variations of and modifications to, and applications of, the invention may take place without departing from the scope of the appended claims.
Claims (12)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NZ203600A NZ203600A (en) | 1983-03-17 | 1983-03-17 | Generating a non-planar fluid working surface |
NZ203600 | 1983-03-17 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0122726A1 true EP0122726A1 (en) | 1984-10-24 |
EP0122726B1 EP0122726B1 (en) | 1986-07-09 |
Family
ID=19920280
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP84301804A Expired EP0122726B1 (en) | 1983-03-17 | 1984-03-16 | Fluid contacting surfaces and devices incorporating such surfaces |
Country Status (8)
Country | Link |
---|---|
EP (1) | EP0122726B1 (en) |
JP (1) | JPS59183001A (en) |
AU (1) | AU571200B2 (en) |
CA (1) | CA1229765A (en) |
DE (1) | DE3460275D1 (en) |
MX (1) | MX161273A (en) |
NZ (1) | NZ203600A (en) |
ZA (1) | ZA842009B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111498049A (en) * | 2020-04-10 | 2020-08-07 | 中船澄西扬州船舶有限公司 | Mounting method of energy-saving stator |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3579914D1 (en) * | 1984-10-12 | 1990-10-31 | Lorimont Pty Ltd | SCREW FOR BOATS. |
JPS62500515A (en) * | 1984-10-12 | 1987-03-05 | ロリモント プロプライエタリー リミテッド | marine propeller |
WO2013115658A1 (en) * | 2012-01-31 | 2013-08-08 | Propeller Technology Ltd | Propeller |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1017915B (en) * | 1955-06-02 | 1957-10-17 | Bergedorfer Eisenwerk Ag | Centrifugal pump for liquid food |
FR2187030A5 (en) * | 1971-07-09 | 1974-01-11 | Crambes Maurice |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS524940B1 (en) * | 1970-02-20 | 1977-02-08 | ||
FR2359294A1 (en) * | 1976-07-23 | 1978-02-17 | Carrouset Pierre | FLUID PREHENSION TURBINE |
NL184075B (en) * | 1978-06-30 | 1988-11-01 | Hva Water Contractors B V | METHOD FOR OPERATING A ROTARY PIVOT ROTATOR AND ROTOR INTENDED FOR CARRYING OUT SUCH A METHOD |
-
1983
- 1983-03-17 NZ NZ203600A patent/NZ203600A/en unknown
-
1984
- 1984-03-14 AU AU25578/84A patent/AU571200B2/en not_active Ceased
- 1984-03-15 CA CA000449675A patent/CA1229765A/en not_active Expired
- 1984-03-16 EP EP84301804A patent/EP0122726B1/en not_active Expired
- 1984-03-16 DE DE8484301804T patent/DE3460275D1/en not_active Expired
- 1984-03-16 JP JP59049393A patent/JPS59183001A/en active Pending
- 1984-03-19 ZA ZA842009A patent/ZA842009B/en unknown
- 1984-03-19 MX MX200712A patent/MX161273A/en unknown
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1017915B (en) * | 1955-06-02 | 1957-10-17 | Bergedorfer Eisenwerk Ag | Centrifugal pump for liquid food |
FR2187030A5 (en) * | 1971-07-09 | 1974-01-11 | Crambes Maurice |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111498049A (en) * | 2020-04-10 | 2020-08-07 | 中船澄西扬州船舶有限公司 | Mounting method of energy-saving stator |
Also Published As
Publication number | Publication date |
---|---|
AU2557884A (en) | 1984-09-20 |
JPS59183001A (en) | 1984-10-18 |
DE3460275D1 (en) | 1986-08-14 |
CA1229765A (en) | 1987-12-01 |
NZ203600A (en) | 1987-03-06 |
AU571200B2 (en) | 1988-04-14 |
EP0122726B1 (en) | 1986-07-09 |
ZA842009B (en) | 1984-10-31 |
MX161273A (en) | 1990-08-27 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US5890875A (en) | Blade apparatus | |
US5158434A (en) | Mixing impellers and impeller systems for mixing and blending liquids and liquid suspensions having a wide range of viscosities | |
US7473025B1 (en) | Mixing impeller with spiral leading edge | |
CA2046213A1 (en) | Mixing impellers and impeller systems for mixing and blending liquids and liquid suspensions having a wide range of viscosities | |
US9731256B2 (en) | Mixing impeller with leading edges minimizing accumulations on blades | |
US2157999A (en) | Ventilating fan | |
EP1953083B1 (en) | Quiet propeller | |
US8770941B2 (en) | Blade orientation of an impeller or propeller | |
US5052892A (en) | High efficiency mixer impeller | |
US4836748A (en) | Ring propeller | |
US7806661B2 (en) | Propeller | |
US6099256A (en) | Three dimensional figure eight propeller/impeller blade apparatus | |
US3174681A (en) | Reversible propeller | |
EP0122726B1 (en) | Fluid contacting surfaces and devices incorporating such surfaces | |
US1371610A (en) | Screw-propeller | |
JP4406110B2 (en) | Stirring blade | |
US3291381A (en) | High energy axial flow apparatus | |
US1117103A (en) | Propeller. | |
JP2573568B2 (en) | Apparatus for producing directed fluid flow | |
GB2027132A (en) | Propeller | |
NZ195418A (en) | Duct combined with ship propeller having blade tip barrier plates | |
US1427307A (en) | Propeller | |
US20130136613A1 (en) | Propeller/impeller blade apparatus | |
KR970000169B1 (en) | Boss cap with fins of a screw propeller | |
CA1207750A (en) | Propeller |
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 |
Designated state(s): CH DE FR GB IT LI NL SE |
|
17P | Request for examination filed |
Effective date: 19850403 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): CH DE FR GB IT LI NL SE |
|
ITF | It: translation for a ep patent filed | ||
REF | Corresponds to: |
Ref document number: 3460275 Country of ref document: DE Date of ref document: 19860814 |
|
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 | ||
ITTA | It: last paid annual fee | ||
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: NL Payment date: 19910331 Year of fee payment: 8 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 19910906 Year of fee payment: 8 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: CH Payment date: 19910920 Year of fee payment: 8 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 19910927 Year of fee payment: 8 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Effective date: 19920316 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: CH Effective date: 19920331 Ref country code: LI Effective date: 19920331 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: SE Payment date: 19920930 Year of fee payment: 9 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: NL Effective date: 19921001 |
|
GBPC | Gb: european patent ceased through non-payment of renewal fee | ||
NLV4 | Nl: lapsed or anulled due to non-payment of the annual fee | ||
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Effective date: 19921130 |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: PL |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SE Effective date: 19930317 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 19940524 Year of fee payment: 11 |
|
EUG | Se: european patent has lapsed |
Ref document number: 84301804.5 Effective date: 19931008 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Effective date: 19951201 |