EP1682779B1 - Radial compressor impeller - Google Patents
Radial compressor impeller Download PDFInfo
- Publication number
- EP1682779B1 EP1682779B1 EP04768299.2A EP04768299A EP1682779B1 EP 1682779 B1 EP1682779 B1 EP 1682779B1 EP 04768299 A EP04768299 A EP 04768299A EP 1682779 B1 EP1682779 B1 EP 1682779B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- centrifugal compressor
- rotor
- compressor according
- flow
- passage
- 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.)
- Active
Links
- 230000003068 static effect Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 230000010349 pulsation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000007787 solid Substances 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
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/284—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for compressors
Definitions
- the invention relates to a compressor, in particular a compressor of the radial or centrifugal type for a turbo machine.
- the compressor comprises a rotor driven by a turbine or other machine having a plurality of generally radial blades which divert axially flowing inlet gas such as air at the centre to provide a pressure rise at the circumference exit.
- inlet gas such as air
- diffusers in the form of tangential vanes are provided to slow down airflow at the exit and hence convert the kinetic energy of the airflow to a pressure rise.
- a multi-stage compressor comprises a plurality of concentrically nested rotors in a correspondingly nested stator configuration. Each stator stage has diffuser vanes and a flow passage to the axial air inlet in the next rotor stage.
- the vane profiles are effectively laminar or plate like occupying a minimal volume of the compressor space and this is termed here a "full entry" compressor.
- a particularly effective embodiment described in GB2366333 relies on a wedge shaped blade occupying a substantial fraction of the compressor volume and this is termed here a "partial entry" compressor.
- a problem with full entry turbomachines is that they must operate at a particular speed for a given flow rate and pressure rise - the science behind this can be quantified using the concept of specific speed. If the flow rate is relatively low, the shaft speed must be high in order to maintain the correct physical dimensions. This creates a problem in that once speeds get over about 20,000 rpm, it is not easy to find a drive system.
- the drives do exist but are expensive - ie a low speed motor with a gearbox or a high speed motor (inverter driven). Once speeds get above 100,000 rpm then it is very difficult to find an appropriate drive.
- Using partial entry is a way of reducing flow rate without increasing shaft speed.
- partial entry compressors are being able to operate at a much reduced shaft speed in comparison to conventional radial compressors.
- a compressor for 10 m 3 /s can operate at 60,000 rpm as opposed to 600,000 rpm. It can be used as a single stage - generally the pressure ratio is limited to 1.6:1 but in most cases, a multistage device is required to achieve higher pressure ratios.
- the pressure ratio is the multiple of the pressure ratio for each stage and the number of stages. 5 stages each of pressure ratio 1.6:1 can achieve 10.48:1 (neglecting interstage pressure losses).
- the partial entry compressor provides an interupted flow of gas to the diffuser at the exit. This is because the flow passages only occupy a fraction of the available area, the rest of which is contained within enclosed islands comprising the partial entry blades.
- the flow leaves the rotor it is in the form of a number of rotating discrete jets of number equal to the number of rotor passages.
- Such a flow will enter the diffuser whose purpose is to recover as much kinetic energy as possible and convert this to useable static pressure rise.
- the diffuser will experience a pulsating flow from the jets, the efficiency of diffusion is quite poor.
- a further problem is windage loss caused by movement of rotor parts adjacent to generally stationary gas causing the gas to move, drawing power from the rotor which is not useful.
- the windage problem is severe for partial entry compressors, increasing approximately with the fifth power of diameter of the rotor.
- the nested configuration solves some of the problem because rotors are adjacent to moving gas from the rotor from which they are nested , the use of partial entry rotors still means that the ratio windage losses to useful work goes up by a factor of 4.
- US patent number 3,369,737 relates to a radial flow machine and, more particularly, to a radial outflow compressor that pumps to high compression ratio in a single stage.
- the invention relates to a radial compressor having swept forward partial entry blades, that is, the blades are curved forwardly in the direction of rotation.
- the forward sweep is turned extensively towards the tangential direction in the direction of rotor rotation such that the resultant exit flow from the exaggerated forward swept flow passage has a tangential velocity greater than the velocity of the compressor blade tips.
- Fig. 1 shows a rotor 10 having a plurality of partial entry blades 12.
- the rotor 10 is driven by a shaft 13 such that air inducted at an axial inlet passage 14 is driven generally outwardly in the passages 16 between adjacent blades 12 to a circumferential exit at 18 when the compressor rotor is rotating in the direction shown by arrow A.
- the exit air is diffused by a plurality of generally linear, tangentially extending diffusers 20 which are angled in the direction of rotation and are wedge shaped, tapering inwardly to a point adjacent the circumferential exit 18 of the compressor rotor 10.
- the diffuser passage wall is preferably close in the radial direction to the rotor exit guiding the flow in an almost tangential direction, maintaining the correct flow angle at the rotor exit and hence maintaining the required pressure ratio.
- the increased pressure air exits the diffuser to the load or to another stage as appropriate.
- the rotor blade 12 can be solid or hollow and includes a concave forward face 22 in the direction of flow A and an increased curvature concave rear face 24 forming generally a D shape profile pointing away from the direction of flow.
- the blade 22 occupies a significant proportion of the volume of the rotor space as a result, a "dead space" being defined between the front and rear faces.
- the forward face is angled generally tangentially and in the direction of flow at the radially innermost inlet region 26 and curves through approximately 180 degrees to extend generally tangentially once again at the radially outer most exit region 28.
- the opposing rear face 24 of an adjacent blade 12 is profiled to provide a curved flow passage 16 therebetween which exits generally tangentially and is of generally constant width.
- the specific profile of the blades/volumes of the blades depends on the gas being compressed and the rotor speed and can be optimised for each case as will be apparent to the skilled reader.
- the exit blade angle is preferably between 20 degrees and 90 degrees (tangential) to a radius of the rotor, as long as sufficient forward speed is provided to allow the flows in the passages of the compressor to re-converge, minimising the pulsation effect.
- the rotor is also profiled in the axial direction but this can be in an entirely conventional manner which will be apparent to the skilled person and so is not described here.
- the pressure rise of a turbo compressor is a direct function of the change in tangential velocity of the gas in a rotor such that the greater the change in velocity, the greater the pressure rise.
- the work input to the gas depends on the change in tangential velocity multiplied by the blade speed, and pressure ratio is a direct function of work input.
- the exit velocity increases with the tip speed of the blades and hence the diameter of the rotor.
- the gas is forced to jet forward faster than the blade speed, the tangential velocity is greater still at the exit and hence so is the pressure increase.
- the blade speed (product of rotor radius and shaft speed) can be reduced and the pressure ratio can be achieved with a lower than normal diameter, in comparison with radial, moderately forward swept or back swept passages. Since the diameter of the rotor is lower, the windage losses are significantly reduced as they are approximately proportionate of the fifth power of diameter of the rotor. For the partial entry machine, it is worth suffering the penalty of low efficiency due to forward sweep since the reduction in windage losses more than makes up for this.
- a rotor with moderately forward swept blades requires a diameter of 90mm at a speed of 60,000 rpm in order to achieve a pressure ratio of 1.6:1 in air.
- This same pressure ratio can be achieved according to the invention with a rotor diameter of only 70mm at the same speed and a decrease in windage losses to about 30% of the original value.
- the compressor described can be used in a single or multi-stage arrangement and any multi-stage arrangement can be nested or a more conventional axial system.
- the compressor can be driven by any appropriate machine such as a turbine or electrical machine and can be used in any appropriate implementation.
Description
- The invention relates to a compressor, in particular a compressor of the radial or centrifugal type for a turbo machine.
- The basic principle of radial compressors is well known: the compressor comprises a rotor driven by a turbine or other machine having a plurality of generally radial blades which divert axially flowing inlet gas such as air at the centre to provide a pressure rise at the circumference exit. Often diffusers in the form of tangential vanes are provided to slow down airflow at the exit and hence convert the kinetic energy of the airflow to a pressure rise.
- The type of compressor used is dependant upon factors such as gas volume flow and one type of compressor particularly useful for flow rates in the intermediate region (1 to 50 litres per second) is described in
GB2366333 GB2366333 GB2366333 - A problem with full entry turbomachines (standard radial geometry) is that they must operate at a particular speed for a given flow rate and pressure rise - the science behind this can be quantified using the concept of specific speed. If the flow rate is relatively low, the shaft speed must be high in order to maintain the correct physical dimensions. This creates a problem in that once speeds get over about 20,000 rpm, it is not easy to find a drive system. The drives do exist but are expensive - ie a low speed motor with a gearbox or a high speed motor (inverter driven). Once speeds get above 100,000 rpm then it is very difficult to find an appropriate drive. Using partial entry is a way of reducing flow rate without increasing shaft speed. Taking a radial compressor with a flow rate of 1m3/s and pressure ratio of 3:1 it would operate at about 30,000 rpm. To obtain ¼ of the flow, the geometry is scaled down by 2 in linear terms and operates at twice the speed. The inlet area goes down by 4 hence ¼ the flow and the pressure ratio is the same since the rotor tip speed is the same. However the machine operates at 60,000 rpm. An alternative is to take the original machine and block off ¾ of the passages. The gas in the remaining passages suffers no effect as long as the inlet is adjusted (no blunt surfaces).
- The main advantage of partial entry compressors is being able to operate at a much reduced shaft speed in comparison to conventional radial compressors. For example - a compressor for 10 m3/s can operate at 60,000 rpm as opposed to 600,000 rpm. It can be used as a single stage - generally the pressure ratio is limited to 1.6:1 but in most cases, a multistage device is required to achieve higher pressure ratios. The pressure ratio is the multiple of the pressure ratio for each stage and the number of stages. 5 stages each of pressure ratio 1.6:1 can achieve 10.48:1 (neglecting interstage pressure losses).
- However there are various problems with partial entry systems. Firstly the partial entry compressor provides an interupted flow of gas to the diffuser at the exit. This is because the flow passages only occupy a fraction of the available area, the rest of which is contained within enclosed islands comprising the partial entry blades. When the flow leaves the rotor, it is in the form of a number of rotating discrete jets of number equal to the number of rotor passages. Such a flow will enter the diffuser whose purpose is to recover as much kinetic energy as possible and convert this to useable static pressure rise. However, since the diffuser will experience a pulsating flow from the jets, the efficiency of diffusion is quite poor.
- A further problem is windage loss caused by movement of rotor parts adjacent to generally stationary gas causing the gas to move, drawing power from the rotor which is not useful. The windage problem is severe for partial entry compressors, increasing approximately with the fifth power of diameter of the rotor. Although the nested configuration solves some of the problem because rotors are adjacent to moving gas from the rotor from which they are nested , the use of partial entry rotors still means that the ratio windage losses to useful work goes up by a factor of 4.
-
US patent number 3,369,737 relates to a radial flow machine and, more particularly, to a radial outflow compressor that pumps to high compression ratio in a single stage. - The invention is set out in the claims. In particular because of the configuration of the partial entry blades a large amount of the forward speed is imparted to the gas flowing through the flow passages allowing the respective flows to re-meet hence minimising the wakes or pulsation effect found in known arrangements.
- Embodiments of the invention will now be described, by way of example, with reference to the drawings, of which:
-
Fig. 1 shows a cross-sectional view of a radial compressor according to the present invention; and -
Fig. 2 shows a cross-sectional view of a radial compressor having an alternative vane configuration. - In overview the invention relates to a radial compressor having swept forward partial entry blades, that is, the blades are curved forwardly in the direction of rotation. In particular the forward sweep is turned extensively towards the tangential direction in the direction of rotor rotation such that the resultant exit flow from the exaggerated forward swept flow passage has a tangential velocity greater than the velocity of the compressor blade tips. As a result it is found that the flow passages effectively reform to provide a full flow passage around the periphery of the motor significantly reducing the effect of the jets at the exit and hence increasing the efficiency of the diffuser. Furthermore an improved pressure ratio is achieved as a result of which the diameter of the compressor can be reduced and/or the compressor can be used in a single stage rather than requiring a nested configuration. This reduction in dimension allows smaller seals and less leakage is encountered giving a higher overall efficiency.
-
Fig. 1 shows arotor 10 having a plurality ofpartial entry blades 12. Therotor 10 is driven by ashaft 13 such that air inducted at anaxial inlet passage 14 is driven generally outwardly in thepassages 16 betweenadjacent blades 12 to a circumferential exit at 18 when the compressor rotor is rotating in the direction shown by arrow A. The exit air is diffused by a plurality of generally linear, tangentially extendingdiffusers 20 which are angled in the direction of rotation and are wedge shaped, tapering inwardly to a point adjacent thecircumferential exit 18 of thecompressor rotor 10. The diffuser passage wall is preferably close in the radial direction to the rotor exit guiding the flow in an almost tangential direction, maintaining the correct flow angle at the rotor exit and hence maintaining the required pressure ratio. The increased pressure air exits the diffuser to the load or to another stage as appropriate. - The
rotor blade 12 can be solid or hollow and includes a concaveforward face 22 in the direction of flow A and an increased curvature concaverear face 24 forming generally a D shape profile pointing away from the direction of flow. Theblade 22 occupies a significant proportion of the volume of the rotor space as a result, a "dead space" being defined between the front and rear faces. The forward face is angled generally tangentially and in the direction of flow at the radiallyinnermost inlet region 26 and curves through approximately 180 degrees to extend generally tangentially once again at the radially outermost exit region 28. The opposingrear face 24 of anadjacent blade 12 is profiled to provide acurved flow passage 16 therebetween which exits generally tangentially and is of generally constant width. The specific profile of the blades/volumes of the blades depends on the gas being compressed and the rotor speed and can be optimised for each case as will be apparent to the skilled reader. The exit blade angle is preferably between 20 degrees and 90 degrees (tangential) to a radius of the rotor, as long as sufficient forward speed is provided to allow the flows in the passages of the compressor to re-converge, minimising the pulsation effect. It will be appreciated that the rotor is also profiled in the axial direction but this can be in an entirely conventional manner which will be apparent to the skilled person and so is not described here. - The significance of the exaggerated forward sweep of the invention can be understood with reference to a general discussion of conventional profiling of compressor blades. In a backswept design, where the rotors are curved away from the direction of flow, the pressure ratio decreases with volume flow rate because the absolute rotor exit velocity is decreased. However in a forward swept design, the pressure ratio increases with volumetric flow rate, therefore there is no need to increase the static pressure in the rotor, as this will only decrease the pressure ratio. Keeping a similar pressure at rotor inlet and exit is beneficial for 2 reasons. Firstly an unfavorable pressure gradient can cause the flow to separate, especially if there is a great deal of turning as in this design. Secondly the flow at the rotor exit normally has a tendency to leak past the rotor shroud on the outside of the rotor because the static pressure at the rotor exit is higher than the inlet pressure. If there is no static pressure rise in the rotor, then this problem is eliminated.
- The pressure rise of a turbo compressor is a direct function of the change in tangential velocity of the gas in a rotor such that the greater the change in velocity, the greater the pressure rise. In particular, the work input to the gas depends on the change in tangential velocity multiplied by the blade speed, and pressure ratio is a direct function of work input. As a result the exit velocity increases with the tip speed of the blades and hence the diameter of the rotor. With the addition of the exaggerated forward sweep of the present invention the gas is forced to jet forward faster than the blade speed, the tangential velocity is greater still at the exit and hence so is the pressure increase. Since the flow leaves the rotor at a velocity greater than the tip speed of the rotor at gas exit, the blade speed (product of rotor radius and shaft speed) can be reduced and the pressure ratio can be achieved with a lower than normal diameter, in comparison with radial, moderately forward swept or back swept passages. Since the diameter of the rotor is lower, the windage losses are significantly reduced as they are approximately proportionate of the fifth power of diameter of the rotor. For the partial entry machine, it is worth suffering the penalty of low efficiency due to forward sweep since the reduction in windage losses more than makes up for this.
- By way of example, a rotor with moderately forward swept blades requires a diameter of 90mm at a speed of 60,000 rpm in order to achieve a pressure ratio of 1.6:1 in air. This same pressure ratio can be achieved according to the invention with a rotor diameter of only 70mm at the same speed and a decrease in windage losses to about 30% of the original value.
- It will be appreciated that a range of possible blade profiles and diffuser profiles can be adopted and it will be seen that an alternative diffuser vane profile is shown in
Figure 2 in which thevanes 20 are generally curved forwardly in the direction of rotation A. - Because the diameter of the
rotor 10 can be reduced, the size of the seals are also reduced and because there is little static pressure rise in the rotor (due to the forward sweep), leakage losses from rotor tip to inlet are minimal. The types of seal available will be familiar to the skilled reader and are described in more detail, inGB2366333 - It will be appreciated that individual elements from the embodiments described above can be interchanged or juxtaposed as appropriate. The compressor described can be used in a single or multi-stage arrangement and any multi-stage arrangement can be nested or a more conventional axial system. The compressor can be driven by any appropriate machine such as a turbine or electrical machine and can be used in any appropriate implementation.
Claims (12)
- A centrifugal compressor comprising a plurality of forward swept partial entry rotor blades (12) each having a forward face (22) in the direction of rotation, and further comprising a diffuser having a plurality of diffuser passage walls (20); characterized in that the rotor blades (22) each include an exit portion (28) extending substantially tangentially to the rotor circumference and the diffuser passage walls (20) each extend substantially tangentially to the rotor circumference and are positioned sufficiently close to the exit portion (28) in a radial direction to guide the air flow in a generally tangential direction.
- A centrifugal compressor according to claim 1, in which the plurality of rotor blades (12) define therebetween forward swept flow passages (16), the flow passages (16) being sufficiently forward swept to allow convergence of flow streams from individual passages in the vicinity of the passage exit (18).
- A centrifugal compressor according to any preceding claim, in which each rotor blade (12) has a forward face (22) in the direction of rotation and a rear face (24) defining an area therebetween.
- A centrifugal compressor according to claim 3, in which the forward face (22) of the rotor blade (12) is concave in the direction of rotation and the rear face (24) of the rotor blade (12) has increased curvature and is convex pointing away from the direction of rotation.
- A centrifugal compressor according to claim 4, in which the forward face (22) is angled generally tangentially and in the direction of rotation at its radially innermost region (26) and curves through approximately 180 degrees to extend generally tangentially once again at its radially outermost region (28).
- A centrifugal compressor according to any of claims 3 to 5 in which the forward (22) and rear (24) faces of respective adjacent rotor blades (12) define a flow passage (16) therebetween.
- A centrifugal compressor according to claim 6 in which the flow passage (16) between rotor blades (12) is curved in the direction of forward sweep.
- A centrifugal compressor according to claim 6 or claim 7 in which the flow passage (16) between adjacent rotor blades (12) is of substantially constant width.
- A centrifugal compressor according to any of the preceding claims in which the diffuser passage walls (20) are generally forward swept in the direction of rotation.
- A centrifugal compressor according to any of claims 6 to 9, in which the maximum tangential width of each rotor blade is significantly greater than the width of each flow passage at the point on the passage which is adjacent the widest part of the blade.
- A centrifugal compressor according to any of claims 6 to 9, in which the maximum tangential width of each blade is at least three times the width of each flow passage at the point on the passage which is adjacent the widest part of the blade.
- A centrifugal compressor according to any of the preceding claims comprising a plurality of rotors (10) in a multi-stage configuration.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0321088A GB0321088D0 (en) | 2003-09-09 | 2003-09-09 | Compressor |
PCT/GB2004/003752 WO2005024242A1 (en) | 2003-09-09 | 2004-09-02 | Radial compressor impeller |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1682779A1 EP1682779A1 (en) | 2006-07-26 |
EP1682779B1 true EP1682779B1 (en) | 2016-11-09 |
Family
ID=29226749
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04768299.2A Active EP1682779B1 (en) | 2003-09-09 | 2004-09-02 | Radial compressor impeller |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1682779B1 (en) |
GB (1) | GB0321088D0 (en) |
WO (1) | WO2005024242A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB0916901D0 (en) | 2009-09-25 | 2009-11-11 | Dynamic Boosting Systems Ltd | Diffuser |
GB2519503B (en) * | 2013-08-19 | 2015-08-12 | Dynamic Boosting Systems Ltd | Diffuser for a forward-swept tangential flow compressor |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1158978A (en) * | 1909-03-01 | 1915-11-02 | Wilhelm Honegger | Turbine-pump, turbine-blower, and propeller. |
US3369737A (en) * | 1962-12-10 | 1968-02-20 | Gen Electric | Radial flow machine |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR849795A (en) * | 1939-02-03 | 1939-12-01 | Turbine for transforming the pressure of a fluid into work or vice versa | |
US2418012A (en) * | 1943-09-20 | 1947-03-25 | Chester Thomas | Impeller for centrifugal apparatus |
US2681760A (en) * | 1949-02-26 | 1954-06-22 | Curtiss Wright Corp | Centrifugal compressor |
US2845216A (en) * | 1952-11-15 | 1958-07-29 | Neu Sa | Centrifugal apparatus for the circulation of fluids |
CH365822A (en) * | 1958-12-24 | 1962-11-30 | Bruno Dr Ing Eck | Impeller fitted with blades for the radial conveyance of air or liquids |
US3140042A (en) * | 1961-08-15 | 1964-07-07 | Fujii Noriyoshi | Wheels for centrifugal fans of the forward curved multiblade type |
-
2003
- 2003-09-09 GB GB0321088A patent/GB0321088D0/en not_active Ceased
-
2004
- 2004-09-02 EP EP04768299.2A patent/EP1682779B1/en active Active
- 2004-09-02 WO PCT/GB2004/003752 patent/WO2005024242A1/en active Application Filing
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1158978A (en) * | 1909-03-01 | 1915-11-02 | Wilhelm Honegger | Turbine-pump, turbine-blower, and propeller. |
US3369737A (en) * | 1962-12-10 | 1968-02-20 | Gen Electric | Radial flow machine |
Also Published As
Publication number | Publication date |
---|---|
GB0321088D0 (en) | 2003-10-08 |
WO2005024242A1 (en) | 2005-03-17 |
EP1682779A1 (en) | 2006-07-26 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US6203275B1 (en) | Centrifugal compressor and diffuser for centrifugal compressor | |
JP5233436B2 (en) | Centrifugal compressor with vaneless diffuser and vaneless diffuser | |
US7293955B2 (en) | Supersonic gas compressor | |
EP1478857B1 (en) | Compressor with an anti-stall tip treatment | |
US5562405A (en) | Multistage axial flow pumps and compressors | |
US5228832A (en) | Mixed flow compressor | |
US5062766A (en) | Turbo compressor | |
JPH086711B2 (en) | Centrifugal compressor | |
CN106151063B (en) | CO circulating gas compressor | |
KR101226363B1 (en) | Centrifugal compressor | |
CN110107539B (en) | A return guide vane structure for fluid machinery | |
JP3557389B2 (en) | Multistage centrifugal compressor | |
EP1682779B1 (en) | Radial compressor impeller | |
CN2165276Y (en) | High-efficiency vane wheel | |
CN112449670B (en) | Non-vane supersonic diffuser for a compressor | |
EP0353002B1 (en) | A regenerative turbomachine | |
US10174766B2 (en) | Diffuser for a forward-swept tangential flow compressor | |
JP2001248597A (en) | Turbo compressor and turbo blower | |
JPH04143499A (en) | Diffuser of centrifugal fluid machine | |
CN214330911U (en) | Centrifugal water pump and water supply equipment | |
JPH078597U (en) | Centrifugal compressor | |
CN213270441U (en) | Compressor impeller and compressor | |
JPH1182389A (en) | Turbo-fluid machinery | |
JP3979033B2 (en) | Multistage turbo compressor | |
CN112727777A (en) | Centrifugal water pump and water supply equipment |
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 |
|
17P | Request for examination filed |
Effective date: 20060410 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PL PT RO SE SI SK TR |
|
DAX | Request for extension of the european patent (deleted) | ||
17Q | First examination report despatched |
Effective date: 20111031 |
|
GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
|
INTG | Intention to grant announced |
Effective date: 20160708 |
|
GRAS | Grant fee paid |
Free format text: ORIGINAL CODE: EPIDOSNIGR3 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PL PT RO SE SI SK TR |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: FG4D |
|
REG | Reference to a national code |
Ref country code: AT Ref legal event code: REF Ref document number: 844201 Country of ref document: AT Kind code of ref document: T Effective date: 20161115 Ref country code: CH Ref legal event code: EP |
|
REG | Reference to a national code |
Ref country code: IE Ref legal event code: FG4D |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R096 Ref document number: 602004050255 Country of ref document: DE |
|
REG | Reference to a national code |
Ref country code: NL Ref legal event code: MP Effective date: 20161109 |
|
REG | Reference to a national code |
Ref country code: AT Ref legal event code: MK05 Ref document number: 844201 Country of ref document: AT Kind code of ref document: T Effective date: 20161109 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20170210 Ref country code: SE Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20161109 Ref country code: NL Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20161109 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: ES Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20161109 Ref country code: FI Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20161109 Ref country code: AT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20161109 Ref country code: PL Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20161109 Ref country code: PT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20170309 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DK Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20161109 Ref country code: EE Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20161109 Ref country code: SK Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20161109 Ref country code: CZ Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20161109 Ref country code: RO Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20161109 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R097 Ref document number: 602004050255 Country of ref document: DE |
|
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 FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20161109 Ref country code: BE Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20161109 Ref country code: BG Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20170209 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: PLFP Year of fee payment: 14 |
|
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 |
Effective date: 20170810 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SI Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20161109 |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: PL |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: MC Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20161109 |
|
REG | Reference to a national code |
Ref country code: IE Ref legal event code: MM4A |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LU Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20170902 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20170902 Ref country code: LI Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20170930 Ref country code: CH Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20170930 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: PLFP Year of fee payment: 15 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: HU Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT; INVALID AB INITIO Effective date: 20040902 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: CY Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20161109 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: TR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20161109 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R081 Ref document number: 602004050255 Country of ref document: DE Owner name: FUTRAHEAT LTD., GB Free format text: FORMER OWNER: DYNAMIC BOOSTING SYSTEMS LTD., LONDON, GB |
|
P01 | Opt-out of the competence of the unified patent court (upc) registered |
Effective date: 20230529 |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: 732E Free format text: REGISTERED BETWEEN 20230615 AND 20230621 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 20230717 Year of fee payment: 20 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 20230719 Year of fee payment: 20 Ref country code: DE Payment date: 20230720 Year of fee payment: 20 |