US20080199318A1 - Adjustment Device For Adjusting Propeller Blades of a Propeller Pump and a Propeller Pump Including Such a Device - Google Patents
Adjustment Device For Adjusting Propeller Blades of a Propeller Pump and a Propeller Pump Including Such a Device Download PDFInfo
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- US20080199318A1 US20080199318A1 US11/993,931 US99393106A US2008199318A1 US 20080199318 A1 US20080199318 A1 US 20080199318A1 US 99393106 A US99393106 A US 99393106A US 2008199318 A1 US2008199318 A1 US 2008199318A1
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- propeller
- drive shaft
- adjustment
- guide slot
- adjustment means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
- F04D15/0055—Rotors with adjustable blades
Definitions
- the present invention relates to propeller pumps or axial pumps and, in particular, to a device for adjusting the propeller blades of the pump.
- U.S. Pat. No. 2,357,229 discloses a pump rotor provided with swivelling blades angularly adjustable automatically while the rotor is in motion.
- Each swivelling blade is formed integrally with its spindle and with an operating crank depending therefrom.
- Pivotally mounted on the lower end of each crank is a block slidably fitting in a groove in one face of a hollow prismatic member disposed around the axis of the hub.
- the prismatic member is hollow with a cylinder interior serving as the cylinder of the axial servo-motor and slidable on the fixed piston carried at the lower end of a hollow part of the hub depending from the inner bearings.
- EP 0 541 046 discloses a propeller pump with blade pitch adjustment in which an adjustment apparatus by a threaded spindle, an adjustment nut axially adjustable thereon which is provided with a slide bar and, via a guide bar bracket arranged in the propeller hub, determines the position of the blades and thereby allows a variation of the flow.
- JP 60162073 A discloses a runner-vane operating mechanism for mixed-flow water wheel.
- a slidable guide directly connected to a piston of a vertically movable servo-motor and an inclined groove is formed in each opposed position on an operating lever fixed onto a runner vane stem.
- a pair of opposed slider blocks are arranged in slidable ways in the longitudinal direction of the groove.
- Each blade is fixedly connected to a respective operating lever. By sliding each block in respective groove, the pitch angle of each corresponding blade can be adjusted.
- DE 1 101 154 discloses an adjustment device for adjusting the blades of a pump or a turbine comprising a hub, bearings incorporated therein, a plurality of propeller blades mounted in said bearings and projecting from said hub, each blade being connected with a corresponding block through a slot, which in turn is connected to a slot block arranged in the slot. By an axial displacement of the slot an adjustment of the pitch angle of blades can be obtained.
- one object of the present invention is to provide an adjustment device for adjusting the propeller blades of a pump and a pump including such a device which, in comparison with prior art, have a high endurance against wear and a high ability of withstanding large forces. This, in turn, provides for a long durability and a good reliability.
- Yet another object of the present invention is to provide a propeller pump comprising an adjustment device for adjusting the propeller blades of the pump during operation of the pump and an adjustment device for adjusting the propeller blades of the pump during operation of the pump.
- a propeller pump comprising an adjustment device for adjusting the propeller blades of the pump and an adjustment device for adjusting the propeller blades of the pump having the features defined in the independent claims. Preferred embodiments are defined in the dependent claims.
- pitch angle refers to the angle between the outer periphery of the pressure side of the propeller blade and the neutral line.
- a propeller pump comprising a hub, bearings incorporated therein, a plurality of propeller blades mounted in the bearings and projecting from the hub, comprising an adjustment device for adjusting the pitch angle of the propeller blades about an axis perpendicular to a drive shaft of the propeller.
- the adjustment device comprises adjustment means mounted within the hub arranged to be axially movable in a direction along the drive shaft, the adjustment means being provided with a plurality of guide slots arranged at circumferential spacings around the surface; a plurality of attachment means rotationally mounted in the hub, each being fixedly attached to a propeller blade and supported by at least one guide slot, wherein each attachment means and the corresponding at least one guide slot are arranged to interact such that a force applied on the attachment means is distributed symmetrically about an axis perpendicular to the drive shaft and parallel with a rotational axis of the attachment means; and wherein the guide slots are arranged to, at an axial movement of the adjustment means, cause the attachment means to rotate about its own rotational axis, whereby the propeller blade in turn is rotated.
- an adjustment device for a propeller pump comprising a hub, bearings incorporated therein, a plurality of propeller blades mounted in said bearings and projecting from said hub, for adjusting the pitch angle of said propeller blades about an axis perpendicular to a drive shaft of the propeller in accordance with the first aspect of the present invention.
- the present invention is based on the idea of arranging each one of the guide slots, which are formed so as to, at an axial movement of the adjustment means, cause the attachment means on which the propeller blades are mounted to rotate about its own rotational axis such that the propeller blades in turn are rotated, to interact with a corresponding attachment means such that a force exerted on the corresponding propeller blade or the attachment means is distributed symmetrically about an axis perpendicular to the drive shaft and parallel with a rotational axis of the attachment means.
- Another advantage is that, due to the symmetrical distribution of the forces, the pitch angle of the propeller blades can be adjusted during operating conditions with large flows applying large forces on the propeller blades, which, in turn, impart large forces to the attachment means. Accordingly, the applicability of the propeller pump according to the present invention is increased.
- a further advantage is that the flow can be varied or changed within a broad range of possible flows at a maintained high efficiency. According to a preferred embodiment, the flow can be varied within a range of 100-50% at a efficiency of about 85-80%.
- An additional advantage is that the construction of the adjustment device according to the present invention is less complex in comparison with the prior art solutions discussed above. Thereby, the manufacturing costs can be lowered.
- each attachment means is supported by two inclined guide slots. Thereby, the ability to withstand forces can be improved even further.
- the two inclined guide slots consist of one upper guide slot, in a direction along the drive shaft, and one lower guide slot, in a direction along the drive shaft, the upper and the lower guide slot being symmetrically arranged about a centre, in a direction along the drive shaft, perimeter line of the adjustment means such that an angle is formed between each guide slot and the perimeter line.
- FIG. 1 schematically shows a propeller pump including an adjustment device according to the present invention
- FIG. 2 schematically shows in more detail the propeller pump in FIG. 1 including an adjustment device according to the present invention
- FIG. 3 shows the adjustment means according to the present invention of FIG. 2 ;
- FIG. 4 shows a second embodiment of the adjustment means according to the present invention
- FIG. 5 shows a third embodiment of the adjustment means according to the present invention.
- FIG. 6 illustrates the pitch angle of a propeller blade shown in cross section.
- the propeller pump or the axial pump 1 comprises a hub 2 , in which bearings 3 (see FIG. 2 ) are incorporated.
- a propeller blade 4 is mounted in each bearing 3 and projects from the hub 2 .
- the direction of the flow is indicated with an arrow denoted with A, i.e. in the y-direction as indicated with the two-dimensional coordinate system of FIG. 1 .
- the pump 1 is mounted in a pump house 9 .
- Adjustment means 5 is slidably arranged within the hub 2 so that it can be moved reciprocally in the y-direction, i.e. in a direction along a drive shaft 7 of the pump 1 connected to a motor (not shown) for driving the pump.
- the adjustment means 5 is a cylindrical sleeve arranged concentrically with the drive shaft 7 .
- An outer envelope surface 8 of the adjustment cylinder 5 is provided with a number of inclined guide slots 6 , formed in pairs, see FIG. 2 .
- the pairs of guide slots 6 are arranged at circumferential spacings at diametrically opposed positions around the surface 8 and symmetrically about a centre, in the x-direction, perimeter line of the adjustment cylinder 5 such that an angle is formed between each guide slot 6 and the perimeter line.
- the angle between each guide slot and the centre perimeter line may be varied.
- the pairs of guide slots are replaced by a single guide slot.
- a pair of yokes 12 is fixedly attached to the adjustment cylinder 5 , for example, by means of bolts (not shown).
- an attachment rod 14 is fixedly mounted between the yokes 12 , for example, by means of mounting screws (not shown), which attachment rod 14 , in turn, is connected to actuator means (not shown) arranged in a housing 16 powered by drive unit 17 .
- the drive unit 17 may be electrical, pneumatic, or hydraulic. In this embodiment, the drive unit 17 is, in turn powered via a drive cable 18 arranged within the drive shaft 7 .
- the drive unit 17 is electrical the drive cable 18 is an electrical lead, if the drive unit 17 is hydraulic the drive cable is an oil line, and if the drive unit 17 pneumatic the drive cable 18 is a line conducting, for example, pressurized air.
- the attachment rod 14 is mounted on a worm drive arranged in the housing 16 , which worm drive, in turn, is connected to the drive unit, which, in this case, is electrical.
- Each propeller blade 4 is mounted on an attachment plate 20 , which in this embodiment is formed as a circular plate.
- a pair of guide means 22 are, in turn, mounted on the attachment plate 20 .
- the guide means 22 are guide pins or protrusions, each being slidably supported in a respective inclined guide slot 6 .
- the guide means 22 are needle bearings arranged in pulleys or rolls.
- the adjustment means 5 is a cylindrical sleeve and the outer envelope surface 8 of the adjustment cylinder 5 is provided with a number of inclined guide slots 6 , formed in pairs.
- the slots are through openings, which not however is a necessary feature.
- the slots can be formed as recesses in the outer envelope surface 8 .
- the pairs of guide slots 6 are arranged at circumferential spacings at diametrically opposed positions around the outer surface 8 and symmetrically about a centre, in the x-direction (i.e. a direction perpendicular to the drive shaft), perimeter line of the adjustment cylinder 5 such that an angle is formed between each guide slot 6 and the perimeter line.
- the adjustment means 25 is a sleeve having a square-formed outer envelope surface 28 a - 28 d , i.e. in a cross section, in a plane perpendicular to the y-direction, the outer perimeter of the sleeve is quadratic, and a circular inner envelope surface 29 , i.e. in a cross section, in a plane perpendicular to the y-direction, the inner perimeter of the sleeve is circular. Furthermore, each lateral surface 28 a - 28 d (where only the sides 28 a , 28 b are shown in FIG.
- the slots are through openings, which however is not a necessary feature.
- the slots can be formed as recesses in the outer envelope surface 8 .
- the pairs of guide slots 26 a and 26 b are arranged at circumferential spacings at diametrically opposed positions around the outer surface 28 and symmetrically about a centre, in the x-direction (i.e.
- perimeter line of the adjustment sleeve 25 such that an angle is formed between an upper guide slot 26 a and a lower guide slot 26 b , in the x-direction, of each pair and the perimeter line.
- the adjustment means 35 is a circular sleeve.
- An outer envelope surface 38 of the adjustment sleeve 35 is provided with a number of V-shaped guide slots 36 .
- the slots are through openings, which however is not a necessary feature.
- the slots can be formed as recesses in the outer envelope surface 38 of the sleeve.
- the guide slots 36 are arranged at circumferential spacings at diametrically opposed positions around the outer surface 38 and symmetrically about a centre, in the x-direction (i.e. a direction perpendicular to the drive shaft), perimeter line of the adjustment sleeve 35 such that an angle is formed between each arm of respective guide slot 36 and the perimeter line.
- the adjustment means can be provided with groups of four inclined guide slots.
- the slots are through openings, which however is not a necessary feature.
- the slots can be formed as recesses in a outer envelope surface of the sleeve.
- the guide slots are arranged at circumferential spacings around the outer surface and symmetrically about a centre, in the x-direction (i.e.
- this embodiment of the adjustment means is used with an attachment plate provided with four guide pins, wherein each guide pin is slidably supported in one inclined guide slot.
- the adjustment means can be designed as an octagonal sleeve or a hexagonal sleeve.
- the different designs of the adjustments sleeve and the guide slots can be combined in other ways and the above mentioned, for example, the V-shaped guide slots can be provided on the sleeve have a quadratic outer perimeter.
- the pump and the adjustment device according to the present invention will be discussed. As indicated above, there is, in many applications, desirably or even necessary to change the flow of a pump or, in other words, change the amount of water pumped per time unit. According to this invention, this can be performed during operation of the pump at large flows. Moreover, the pump according to the present invention is capable of delivering flows within a broad range of flows.
- the adjustment device work as follows.
- the drive unit 17 receives an instruction or command that the flow should be increased or decreased by a control unit.
- This instruction can be created either manually by an operator via an operator unit or automatically by, for example, the control unit.
- the drive unit 17 activates the actuator means, which, in turn, moves the attachment rod 14 axially in the y-direction (i.e. along the axis of the drive shaft 7 ), either in forward direction or a rearward direction depending of whether the flow is to be increased or decreased.
- the attachment rod 14 which is fixedly mounted between the yokes 12 , moves the yokes 12 , which, in turn, moves the adjustment means 5 in the axial direction, i.e. in the y-direction.
- the flow is, in turn, increased.
- the guide pins 22 will slide in respective inclined guide slots 6 causing the attachment plates 20 to rotate in a counter clock-wise direction, as viewed in the FIG. 1 .
- each propeller blade 4 mounted on a respective attachment plate 20 is rotated in the same direction and the pitch angle of the propeller blades is increased.
- the pitch angle is defined as the angle between the outer periphery 40 of the propeller blade 42 and the neutral line 44 .
- the pitch angle can be changed within a range of approximately 28 degrees to 5 degrees, and more preferably, within a range of approximately 25 degrees to 6 degrees.
- a preferred angle adjustment is approximately +/ ⁇ 1 degree.
- the flow change resulting from an adjustment of the angel with 1 degree depends of the absolute angle position.
- An adjustment from a large angle, for example, from 24 to 23 degrees, corresponds to a reduction of the flow of about 3%.
- the flow reduction is about 5%.
- a range of about 25 degrees to about 8 degrees corresponds to a regulating range of the flow about 50% to 100% of the flow at an approximately constant efficiency, i.e. at an efficiency of about 85-80%.
- the pump and in particular parts such as, for example, the propeller blades, the attachment means including the attachment plates and guide pins as well as the adjustment sleeve are subjected to forces of a considerable magnitude resulting from the flow. Due to the construction of the adjustment device in accordance with the present invention, in which the adjustment device is provided with guide slots formed symmetrically with respect to a centre line, along a x-direction and perpendicular to the y-direction (see FIG.
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Abstract
Description
- The present invention relates to propeller pumps or axial pumps and, in particular, to a device for adjusting the propeller blades of the pump.
- In many pump applications it is often desirable and/or necessary to vary the flow, which can be achieved, for example, by rotating the propeller blades of the pump about their own axis (adjusting the angle of incidence of the fluid against the propeller blades), i.e. adjusting the pitch angle of the propeller blades. These adjustments are often performed manually, i.e. the pump is disconnected and an operator manually adjusts the blade to obtain the desired or required angle with respect to the flow direction. This is time consuming as well as it entails high costs due to operational disturbances and labour requirements. Moreover, this manual adjustment is highly impractical if these variations are of a frequent nature and it may even be inapplicable if the changes of the flow occur at a sufficiently high frequency. Accordingly, it is often necessary to be able to adjust the flow during the operation of the pump.
- By using so called frequency control to adjust the flow of a pump it is possible to achieve this flow variation during the operation of the pump by increasing/decreasing the number of revolutions of the propeller in order to achieve a corresponding increase/decrease of the flow in accordance with the requirements or desires. However, the frequency control allows an adjustment of the flow of about 30%, which, in many applications, is a too narrow range. This applies in particular in applications where considerably flow variations are desired or required as, for example, in adventure baths, artificial waterfalls for paddling and other waterfall activities such as rafting. Therefore, a number of approaches have been proposed that address the above mentioned problems.
- U.S. Pat. No. 2,357,229 discloses a pump rotor provided with swivelling blades angularly adjustable automatically while the rotor is in motion. Each swivelling blade is formed integrally with its spindle and with an operating crank depending therefrom. Pivotally mounted on the lower end of each crank is a block slidably fitting in a groove in one face of a hollow prismatic member disposed around the axis of the hub. The prismatic member is hollow with a cylinder interior serving as the cylinder of the axial servo-motor and slidable on the fixed piston carried at the lower end of a hollow part of the hub depending from the inner bearings. The admission of fluid under pressure to the servo-motor cylinder on one side or the other of the piston causes axial reciprocation of the member and this imparts a swivelling movement to the cranks and hence to the blades through sliders and inclined grooves, thereby obtaining a variation of the flow.
- EP 0 541 046 discloses a propeller pump with blade pitch adjustment in which an adjustment apparatus by a threaded spindle, an adjustment nut axially adjustable thereon which is provided with a slide bar and, via a guide bar bracket arranged in the propeller hub, determines the position of the blades and thereby allows a variation of the flow.
- JP 60162073 A discloses a runner-vane operating mechanism for mixed-flow water wheel. In this mechanism, a slidable guide directly connected to a piston of a vertically movable servo-motor and an inclined groove is formed in each opposed position on an operating lever fixed onto a runner vane stem. On both sides of the inclined groove, a pair of opposed slider blocks are arranged in slidable ways in the longitudinal direction of the groove. Each blade is fixedly connected to a respective operating lever. By sliding each block in respective groove, the pitch angle of each corresponding blade can be adjusted.
-
DE 1 101 154 discloses an adjustment device for adjusting the blades of a pump or a turbine comprising a hub, bearings incorporated therein, a plurality of propeller blades mounted in said bearings and projecting from said hub, each blade being connected with a corresponding block through a slot, which in turn is connected to a slot block arranged in the slot. By an axial displacement of the slot an adjustment of the pitch angle of blades can be obtained. - All of the above described pumps with adjustable propellers blades or adjustments devices disclose an unsymmetrical distribution of forces at the hub or, in fact, at respective attachment point of the cranks or arms. Furthermore, the pump rotor with adjustable propeller blades according to U.S. Pat. No. 2,357,229 and the adjustment device of JP 60162073 A both discloses long cranks or arms carrying the blades, which gives a long arm of lever between the blade and respective attachment point at the hub. This may cause problems because, in many applications, the flow may periodically be very strong, in particular in certain applications such as in adventure baths, artificial waterfalls for paddling and other waterfall activities such as rafting, which entail that considerable forces will act on the pumps and especially on parts of the pumps such as the propeller blades, the cranks or arms carrying the blades, and the attachment points of the cranks or arms. Accordingly, the durability of the pumps can be severely shorten. Furthermore, since the wear of certain parts such as the attachments point of the cranks or arms at the hub may be significant, shutdowns due to maintenance may be frequent.
- Thus, one object of the present invention is to provide an adjustment device for adjusting the propeller blades of a pump and a pump including such a device which, in comparison with prior art, have a high endurance against wear and a high ability of withstanding large forces. This, in turn, provides for a long durability and a good reliability.
- It is another object of the present invention to provide a propeller pump comprising an adjustment device for adjusting the propeller blades of the pump and an adjustment device for adjusting the propeller blades of the pump which can obtain large variations of the flow.
- Yet another object of the present invention is to provide a propeller pump comprising an adjustment device for adjusting the propeller blades of the pump during operation of the pump and an adjustment device for adjusting the propeller blades of the pump during operation of the pump.
- These and other object are achieved according to the present invention by providing a propeller pump comprising an adjustment device for adjusting the propeller blades of the pump and an adjustment device for adjusting the propeller blades of the pump having the features defined in the independent claims. Preferred embodiments are defined in the dependent claims.
- For purposes of clarity, the term “pitch angle” refers to the angle between the outer periphery of the pressure side of the propeller blade and the neutral line.
- According to a first aspect of the present invention, there is provided a propeller pump comprising a hub, bearings incorporated therein, a plurality of propeller blades mounted in the bearings and projecting from the hub, comprising an adjustment device for adjusting the pitch angle of the propeller blades about an axis perpendicular to a drive shaft of the propeller. The adjustment device comprises adjustment means mounted within the hub arranged to be axially movable in a direction along the drive shaft, the adjustment means being provided with a plurality of guide slots arranged at circumferential spacings around the surface; a plurality of attachment means rotationally mounted in the hub, each being fixedly attached to a propeller blade and supported by at least one guide slot, wherein each attachment means and the corresponding at least one guide slot are arranged to interact such that a force applied on the attachment means is distributed symmetrically about an axis perpendicular to the drive shaft and parallel with a rotational axis of the attachment means; and wherein the guide slots are arranged to, at an axial movement of the adjustment means, cause the attachment means to rotate about its own rotational axis, whereby the propeller blade in turn is rotated.
- According a second aspect of the present invention, there is provided an adjustment device for a propeller pump comprising a hub, bearings incorporated therein, a plurality of propeller blades mounted in said bearings and projecting from said hub, for adjusting the pitch angle of said propeller blades about an axis perpendicular to a drive shaft of the propeller in accordance with the first aspect of the present invention.
- Thus, the present invention is based on the idea of arranging each one of the guide slots, which are formed so as to, at an axial movement of the adjustment means, cause the attachment means on which the propeller blades are mounted to rotate about its own rotational axis such that the propeller blades in turn are rotated, to interact with a corresponding attachment means such that a force exerted on the corresponding propeller blade or the attachment means is distributed symmetrically about an axis perpendicular to the drive shaft and parallel with a rotational axis of the attachment means.
- This solution provides several advantages over the existing solutions for adjusting the propeller blades of a pump. One is that the ability to withstand large forces is improved significantly in comparison with the known devices and the systems described in U.S. Pat. No. 2,357,229, EP 0 541 046, JP 60162073, and
DE 1 101 154, which all discloses an unsymmetrical distribution of the forces applied to the propeller blades and propagated further to the attachment means. This is an important feature since the forces acting on each blade usually are of a considerably magnitude. In some applications where the flows periodically can be extremely strong, such as in adventure baths, artificial waterfalls for paddling and other waterfall activities such as rafting, this ability may even be a necessary condition because of the considerable forces acting on the pumps and especially on parts of the pumps such as the propeller blades, the cranks or arms carrying the blades, and the attachment points of the cranks or arms. - Another advantage is that, due to the symmetrical distribution of the forces, the pitch angle of the propeller blades can be adjusted during operating conditions with large flows applying large forces on the propeller blades, which, in turn, impart large forces to the attachment means. Accordingly, the applicability of the propeller pump according to the present invention is increased.
- A further advantage is that the flow can be varied or changed within a broad range of possible flows at a maintained high efficiency. According to a preferred embodiment, the flow can be varied within a range of 100-50% at a efficiency of about 85-80%.
- An additional advantage is that the construction of the adjustment device according to the present invention is less complex in comparison with the prior art solutions discussed above. Thereby, the manufacturing costs can be lowered.
- Moreover, due to the symmetrical force distribution in the adjustment device and the simple construction thereof, a high endurance against wear can be achieved. This, in turn, provides for a long durability and a good reliability, and, in addition, lowered maintenance costs.
- In one embodiment of the present invention, each attachment means is supported by two inclined guide slots. Thereby, the ability to withstand forces can be improved even further.
- According to one exemplifying embodiment of the present invention, the two inclined guide slots consist of one upper guide slot, in a direction along the drive shaft, and one lower guide slot, in a direction along the drive shaft, the upper and the lower guide slot being symmetrically arranged about a centre, in a direction along the drive shaft, perimeter line of the adjustment means such that an angle is formed between each guide slot and the perimeter line.
- Further objects and advantages of the present invention will be discussed below by means of exemplifying embodiments.
- Above-mentioned and other features and advantages of the present invention will be apparent from the following detailed description of preferred embodiments, merely exemplifying, in conjunction with the attached drawing, wherein:
-
FIG. 1 schematically shows a propeller pump including an adjustment device according to the present invention; -
FIG. 2 schematically shows in more detail the propeller pump inFIG. 1 including an adjustment device according to the present invention; -
FIG. 3 shows the adjustment means according to the present invention ofFIG. 2 ; -
FIG. 4 shows a second embodiment of the adjustment means according to the present invention; -
FIG. 5 shows a third embodiment of the adjustment means according to the present invention; and -
FIG. 6 illustrates the pitch angle of a propeller blade shown in cross section. - In the following, there will be disclosed preferred embodiments of the present invention.
- Hereinafter all directions will be referred to the two-dimensional coordinate systems shown in
FIG. 1 . - With reference first to
FIG. 1 , a propeller pump comprising an adjustment device in accordance with the present invention will be described. The propeller pump or theaxial pump 1 comprises ahub 2, in which bearings 3 (seeFIG. 2 ) are incorporated. Apropeller blade 4 is mounted in eachbearing 3 and projects from thehub 2. The direction of the flow is indicated with an arrow denoted with A, i.e. in the y-direction as indicated with the two-dimensional coordinate system ofFIG. 1 . Furthermore, thepump 1 is mounted in apump house 9. - Turning now to
FIG. 2 , thepump 1 shown inFIG. 1 will be described in more detail. Adjustment means 5 is slidably arranged within thehub 2 so that it can be moved reciprocally in the y-direction, i.e. in a direction along adrive shaft 7 of thepump 1 connected to a motor (not shown) for driving the pump. In this embodiment, the adjustment means 5 is a cylindrical sleeve arranged concentrically with thedrive shaft 7. Anouter envelope surface 8 of theadjustment cylinder 5 is provided with a number ofinclined guide slots 6, formed in pairs, seeFIG. 2 . The pairs ofguide slots 6 are arranged at circumferential spacings at diametrically opposed positions around thesurface 8 and symmetrically about a centre, in the x-direction, perimeter line of theadjustment cylinder 5 such that an angle is formed between eachguide slot 6 and the perimeter line. As will be described hereinafter with reference toFIGS. 3-5 and as the skilled man easily realizes, there are a number of other designs of the adjustment device and the guide slots that are conceivable and within the scope of the present invention. As one example, the angle between each guide slot and the centre perimeter line may be varied. In another example, the pairs of guide slots are replaced by a single guide slot. - Furthermore, a pair of
yokes 12 is fixedly attached to theadjustment cylinder 5, for example, by means of bolts (not shown). Moreover, anattachment rod 14 is fixedly mounted between theyokes 12, for example, by means of mounting screws (not shown), whichattachment rod 14, in turn, is connected to actuator means (not shown) arranged in ahousing 16 powered bydrive unit 17. Thedrive unit 17 may be electrical, pneumatic, or hydraulic. In this embodiment, thedrive unit 17 is, in turn powered via adrive cable 18 arranged within thedrive shaft 7. If thedrive unit 17 is electrical thedrive cable 18 is an electrical lead, if thedrive unit 17 is hydraulic the drive cable is an oil line, and if thedrive unit 17 pneumatic thedrive cable 18 is a line conducting, for example, pressurized air. According to one preferred embodiment, theattachment rod 14 is mounted on a worm drive arranged in thehousing 16, which worm drive, in turn, is connected to the drive unit, which, in this case, is electrical. - Each
propeller blade 4 is mounted on anattachment plate 20, which in this embodiment is formed as a circular plate. A pair of guide means 22 are, in turn, mounted on theattachment plate 20. According to this embodiment, the guide means 22 are guide pins or protrusions, each being slidably supported in a respectiveinclined guide slot 6. In one embodiment, the guide means 22 are needle bearings arranged in pulleys or rolls. - With reference now to
FIG. 3 , the adjustment means in accordance with the present invention ofFIGS. 1 and 2 is shown in more detail. According to this embodiment, the adjustment means 5 is a cylindrical sleeve and theouter envelope surface 8 of theadjustment cylinder 5 is provided with a number ofinclined guide slots 6, formed in pairs. In this embodiment, the slots are through openings, which not however is a necessary feature. For example, the slots can be formed as recesses in theouter envelope surface 8. The pairs ofguide slots 6 are arranged at circumferential spacings at diametrically opposed positions around theouter surface 8 and symmetrically about a centre, in the x-direction (i.e. a direction perpendicular to the drive shaft), perimeter line of theadjustment cylinder 5 such that an angle is formed between eachguide slot 6 and the perimeter line. - Turning now to
FIG. 4 , a second embodiment of the adjustment means in accordance with the present invention will be shown. According to this embodiment, the adjustment means 25 is a sleeve having a square-formed outer envelope surface 28 a-28 d, i.e. in a cross section, in a plane perpendicular to the y-direction, the outer perimeter of the sleeve is quadratic, and a circularinner envelope surface 29, i.e. in a cross section, in a plane perpendicular to the y-direction, the inner perimeter of the sleeve is circular. Furthermore, each lateral surface 28 a-28 d (where only thesides FIG. 4 ) of the outer envelope surface 28 of theadjustment sleeve 25 is provided with a pair ofinclined guide slots outer envelope surface 8. The pairs ofguide slots adjustment sleeve 25 such that an angle is formed between anupper guide slot 26 a and alower guide slot 26 b, in the x-direction, of each pair and the perimeter line. - Referring now to
FIG. 5 , a third embodiment of the adjustment means in accordance with the present invention will be shown. According to this embodiment, the adjustment means 35 is a circular sleeve. Anouter envelope surface 38 of theadjustment sleeve 35 is provided with a number of V-shapedguide slots 36. In this embodiment, the slots are through openings, which however is not a necessary feature. For example, the slots can be formed as recesses in theouter envelope surface 38 of the sleeve. Theguide slots 36 are arranged at circumferential spacings at diametrically opposed positions around theouter surface 38 and symmetrically about a centre, in the x-direction (i.e. a direction perpendicular to the drive shaft), perimeter line of theadjustment sleeve 35 such that an angle is formed between each arm ofrespective guide slot 36 and the perimeter line. - As should be obvious for the man skilled in the art from the above, there are a number of conceivable designs and modifications of the adjustment device and, in particular, of the adjustment means and the above described embodiments should be considered only as exemplifications. In order to further illustrate this, a yet another embodiment of the adjustment means will be discussed in the following. According to this further embodiment, the adjustment means can be provided with groups of four inclined guide slots. In this embodiment, the slots are through openings, which however is not a necessary feature. For example, the slots can be formed as recesses in a outer envelope surface of the sleeve. The guide slots are arranged at circumferential spacings around the outer surface and symmetrically about a centre, in the x-direction (i.e. a direction perpendicular to the drive shaft), perimeter line of the adjustment sleeve such that an angle is formed between each guide slot and the perimeter line. Preferably, this embodiment of the adjustment means is used with an attachment plate provided with four guide pins, wherein each guide pin is slidably supported in one inclined guide slot. Furthermore, the adjustment means can be designed as an octagonal sleeve or a hexagonal sleeve. Moreover, the different designs of the adjustments sleeve and the guide slots can be combined in other ways and the above mentioned, for example, the V-shaped guide slots can be provided on the sleeve have a quadratic outer perimeter.
- Now the operation of the pump and the adjustment device according to the present invention will be discussed. As indicated above, there is, in many applications, desirably or even necessary to change the flow of a pump or, in other words, change the amount of water pumped per time unit. According to this invention, this can be performed during operation of the pump at large flows. Moreover, the pump according to the present invention is capable of delivering flows within a broad range of flows.
- In operation, the adjustment device work as follows. First, the
drive unit 17 receives an instruction or command that the flow should be increased or decreased by a control unit. This instruction can be created either manually by an operator via an operator unit or automatically by, for example, the control unit. Thedrive unit 17 activates the actuator means, which, in turn, moves theattachment rod 14 axially in the y-direction (i.e. along the axis of the drive shaft 7), either in forward direction or a rearward direction depending of whether the flow is to be increased or decreased. Theattachment rod 14, which is fixedly mounted between theyokes 12, moves theyokes 12, which, in turn, moves the adjustment means 5 in the axial direction, i.e. in the y-direction. - If the adjustment means 5 is moved in a direction such that the pitch angle of the propeller blades increases, the flow is, in turn, increased. For example, at a movement in a forward direction of the adjustment means 5, the guide pins 22 will slide in respective
inclined guide slots 6 causing theattachment plates 20 to rotate in a counter clock-wise direction, as viewed in theFIG. 1 . Thereby, eachpropeller blade 4 mounted on arespective attachment plate 20 is rotated in the same direction and the pitch angle of the propeller blades is increased. As described above and with reference toFIG. 6 , the pitch angle is defined as the angle between theouter periphery 40 of thepropeller blade 42 and theneutral line 44. - On the other hand, if the adjustment means 5 is moved in a direction such that the pitch angle of the propeller blades decreases, the flow is, in turn, decreased. At the movement in a rearward direction of the adjustment means 5, the guide pins 22 will slide in respective
inclined guide slots 6 thereby causing theattachment plates 20 to rotate in a clock-wise direction, as viewed in theFIG. 1 . Accordingly, eachpropeller blade 4 mounted on arespective attachment plate 20 is rotated in the same direction and the pitch angle of the propeller blades is decreased and, thus, the flow of the pump is decreased. Preferably, the pitch angle can be changed within a range of approximately 28 degrees to 5 degrees, and more preferably, within a range of approximately 25 degrees to 6 degrees. Moreover, a preferred angle adjustment is approximately +/−1 degree. The flow change resulting from an adjustment of the angel with 1 degree depends of the absolute angle position. An adjustment from a large angle, for example, from 24 to 23 degrees, corresponds to a reduction of the flow of about 3%. At an adjustment from, for example, 8 to 7 degrees, the flow reduction is about 5%. According to one embodiment, a range of about 25 degrees to about 8 degrees corresponds to a regulating range of the flow about 50% to 100% of the flow at an approximately constant efficiency, i.e. at an efficiency of about 85-80%. - During operation of the pump, and in particular during the adjustment operation to change the pitch angle of the propeller blades in order to increase or decrease the flow, the pump and in particular parts such as, for example, the propeller blades, the attachment means including the attachment plates and guide pins as well as the adjustment sleeve are subjected to forces of a considerable magnitude resulting from the flow. Due to the construction of the adjustment device in accordance with the present invention, in which the adjustment device is provided with guide slots formed symmetrically with respect to a centre line, along a x-direction and perpendicular to the y-direction (see
FIG. 1 ), of the sleeve and where the attachment means is arranged to interact with the guide slots, these forces of a considerable magnitude are distributed symmetrically about an axis perpendicular to the drive shaft and parallel with a rotational axis of said attachment means. Thereby, high endurance against wear and a high ability of withstanding large forces are obtained, which, in turn, provides for a long durability and a good reliability. - Although specific embodiments have been shown and described herein for purposes of illustration and exemplification, it is understood by those of ordinary skill in the art that the specific embodiments shown and described may be substituted for a wide variety of alternative and/or equivalent implementations without departing from the scope of the present invention. This application is intended to cover any adaptations or variations of the preferred embodiments discussed herein. Consequently, the present invention is defined by the wordings of the appended claims and equivalents thereof.
Claims (10)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/993,931 US20080199318A1 (en) | 2005-06-22 | 2006-06-05 | Adjustment Device For Adjusting Propeller Blades of a Propeller Pump and a Propeller Pump Including Such a Device |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US69301805P | 2005-06-22 | 2005-06-22 | |
US11/993,931 US20080199318A1 (en) | 2005-06-22 | 2006-06-05 | Adjustment Device For Adjusting Propeller Blades of a Propeller Pump and a Propeller Pump Including Such a Device |
PCT/SE2006/000658 WO2006137765A1 (en) | 2005-06-22 | 2006-06-05 | Adjustment device for adjusting propeller blades of a propeller pump and a propeller pump including such a device |
Publications (1)
Publication Number | Publication Date |
---|---|
US20080199318A1 true US20080199318A1 (en) | 2008-08-21 |
Family
ID=36809599
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/993,931 Abandoned US20080199318A1 (en) | 2005-06-22 | 2006-06-05 | Adjustment Device For Adjusting Propeller Blades of a Propeller Pump and a Propeller Pump Including Such a Device |
Country Status (9)
Country | Link |
---|---|
US (1) | US20080199318A1 (en) |
EP (1) | EP1893873A1 (en) |
CN (1) | CN101228356B (en) |
AR (1) | AR054490A1 (en) |
BR (1) | BRPI0612494A2 (en) |
MX (1) | MX2007013538A (en) |
NI (1) | NI200700288A (en) |
RU (1) | RU2008102237A (en) |
WO (1) | WO2006137765A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20140322016A1 (en) * | 2013-04-29 | 2014-10-30 | Snecma | System for controlling the pitch of the propeller blades of a turbomachine, and a turbomachine with a propeller for an aircraft with such a system |
CN110127038A (en) * | 2019-05-27 | 2019-08-16 | 安徽卓尔航空科技有限公司 | A kind of propeller hub of adjustable-piston |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105508286B (en) * | 2015-12-14 | 2018-02-06 | 江苏省水利勘测设计研究院有限公司 | A kind of blade enters the reflexibie axial flow pump in waterside |
CN114593067B (en) * | 2022-03-23 | 2023-06-23 | 扬州弘跃机械有限公司 | High-sealing axial flow pump |
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2006
- 2006-06-05 WO PCT/SE2006/000658 patent/WO2006137765A1/en active Application Filing
- 2006-06-05 MX MX2007013538A patent/MX2007013538A/en not_active Application Discontinuation
- 2006-06-05 RU RU2008102237/06A patent/RU2008102237A/en unknown
- 2006-06-05 EP EP06747852A patent/EP1893873A1/en not_active Withdrawn
- 2006-06-05 US US11/993,931 patent/US20080199318A1/en not_active Abandoned
- 2006-06-05 CN CN2006800221686A patent/CN101228356B/en not_active Expired - Fee Related
- 2006-06-05 BR BRPI0612494-1A patent/BRPI0612494A2/en not_active IP Right Cessation
- 2006-06-21 AR ARP060102664A patent/AR054490A1/en unknown
-
2007
- 2007-11-09 NI NI200700288A patent/NI200700288A/en unknown
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US1650776A (en) * | 1927-11-29 | stock | ||
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US3788768A (en) * | 1971-09-17 | 1974-01-29 | Financ Ind Des Ateliers Et Cha | Facility for controlling the orientation of variable-pitch screw blades |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20140322016A1 (en) * | 2013-04-29 | 2014-10-30 | Snecma | System for controlling the pitch of the propeller blades of a turbomachine, and a turbomachine with a propeller for an aircraft with such a system |
US9677408B2 (en) * | 2013-04-29 | 2017-06-13 | Snecma | System for controlling the pitch of the propeller blades of a turbomachine, and a turbomachine with a propeller for an aircraft with such a system |
CN110127038A (en) * | 2019-05-27 | 2019-08-16 | 安徽卓尔航空科技有限公司 | A kind of propeller hub of adjustable-piston |
Also Published As
Publication number | Publication date |
---|---|
CN101228356B (en) | 2012-01-04 |
MX2007013538A (en) | 2008-01-16 |
EP1893873A1 (en) | 2008-03-05 |
RU2008102237A (en) | 2009-07-27 |
BRPI0612494A2 (en) | 2012-01-03 |
WO2006137765A1 (en) | 2006-12-28 |
NI200700288A (en) | 2008-06-25 |
CN101228356A (en) | 2008-07-23 |
AR054490A1 (en) | 2007-06-27 |
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