CN111409804A - Ducted fan type propulsion device and ship - Google Patents
Ducted fan type propulsion device and ship Download PDFInfo
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- CN111409804A CN111409804A CN202010363087.4A CN202010363087A CN111409804A CN 111409804 A CN111409804 A CN 111409804A CN 202010363087 A CN202010363087 A CN 202010363087A CN 111409804 A CN111409804 A CN 111409804A
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- ducted fan
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H7/00—Propulsion directly actuated on air
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Abstract
The invention discloses a ducted fan type propulsion device and a ship, wherein the ducted fan type propulsion device comprises: the tail flow diversion device is arranged at the tail part of the annular shell, and the axial section of the annular shell is a wing-shaped section; the wake flow direction changing device comprises a rudder blade and a direction changing device for driving the rudder blade to rotate, two ends of the rudder blade are rotatably arranged on the annular shell, the rudder blade guides airflow flowing out of the annular body, and the direction of the airflow is changed, so that the direction of the reverse thrust of the airflow is changed, the movement direction of the ducted fan type propelling device is further changed, and the propelling device is simple in structure and convenient to operate; the ship comprises a ducted fan type propulsion device arranged on a ship body, the ship propulsion device is convenient to install, the service life of the ship can be prolonged, and underwater organisms are prevented from being injured.
Description
Technical Field
The invention relates to the technical field of ship devices, in particular to a ducted fan type propulsion device and a ship.
Background
The ship propeller is a device which rotates in water by means of blades and converts the rotating power of an engine into propelling force. When the rotating speed of the propeller is too high, the pressure of the surface of the back of the blade is reduced to the saturated steam pressure of water, the water is vaporized to generate a cavitation phenomenon, severe pressure change is generated on surrounding fluid, so that the resistance is increased, the propulsion efficiency is reduced, and even the propeller is subjected to cavitation erosion; meanwhile, vibration and noise are also sharply increased, and noise pollution is generated. Although a great deal of measures are adopted to protect the propeller, the components in the lake and the ocean inevitably corrode the propeller and influence the service life of the propeller, and the propeller is at the bottom of the ship and is not beneficial to maintenance. The tail shaft of the propeller extending out of the cabin is connected with the propeller and the cabin, a gap is formed between the tail shaft and the shaft tube, the transmission efficiency is ensured, and water is not leaked, so that the sealing structure of the ship is high in requirement. If plants or fish nets in water are wound on the propeller during the process of going, the maneuvering performance of the ship can be influenced, and even the stability and the safety of the ship can be influenced. In addition, for various propeller-propelled ships, when the propeller works, fish can be damaged, and the fish can be slightly scarred, and can die when the propeller works, and even rare fish can disappear. Therefore, the layout and the propulsion mode of the traditional ship propulsion system are adjusted, so that the ship propulsion efficiency, the stability and the safety are higher, the manufacturing and maintenance cost is lower, and meanwhile, the damage to fishes is reduced or avoided, and the technical problem which needs to be solved urgently is solved.
Disclosure of Invention
The invention aims to provide a ducted fan type propulsion device and a ship, which are used for solving the problems in the prior art, so that reverse airflow generated by the ducted fan type propulsion device provides power, the operation convenience and the installation convenience are improved, and underwater organisms are prevented from being damaged.
In order to achieve the purpose, the invention provides the following scheme: the invention provides a ducted fan type propelling device which comprises an annular shell, an air supply assembly and a wake flow direction changing device, wherein the air supply assembly is arranged in the annular shell; the wake flow direction changing device comprises a rudder blade and a steering device for driving the rudder blade to rotate, and two ends of the rudder blade are rotatably arranged on the annular shell so as to change the movement direction of the ducted fan type propelling device.
Preferably, the air supply assembly further comprises an internal motor in transmission connection with the fan, the internal motor is used for driving the fan to rotate in the forward and reverse directions, and the fan is arranged in the middle of the annular shell and located at the position with the smallest inner diameter.
Preferably, the device further comprises a fixing frame; the fan comprises a front rotating shaft and a plurality of fan blades arranged on the front rotating shaft, the built-in motor is coaxially and fixedly connected with one end of the front rotating shaft, which is far away from the air inlet, the tail part of the front rotating shaft is coaxially connected with a tail casing for fixing the built-in motor, and the tail casing is fixed in the annular casing through the fixing frame.
Preferably, the axial section of the front rotating shaft after being connected with the tail casing and the cross section of the fan blade are both airfoil sections.
Preferably, one end of the rudder blade is provided with a steering wheel; the steering device comprises a direction motor and a driving wheel fixedly connected with the direction motor, and the driving wheel is in transmission connection with the direction wheel.
Preferably, the rudder blade is fixedly connected with a rudder shaft, and the end part of the rudder shaft is provided with the steering wheel; the annular shell is provided with an upper shaft hole and a lower shaft hole which correspond to each other at the air outlet, and two ends of the rudder shaft are respectively arranged on the upper shaft hole and the lower shaft hole; the cross section of the rudder blade is an airfoil section.
Preferably, the steering wheel and the driving wheel are both gears, and the steering driving mechanism further comprises a rack which is in meshing transmission with the driving wheel and the steering wheel.
Preferably, still including being used for the protection turn to device's protecting housing, protecting housing is fixed to be set up the cyclic annular casing outside, rack seat and direction motor support are installed to the protecting housing inside wall, slidable installation on the rack seat the rack, the motor support is used for the installation the direction motor.
Preferably, a grille is arranged on one side of the air inlet of the annular shell, and the grille comprises an annular shape, a square shape or a honeycomb shape.
The invention also provides a ship, which comprises a ship body, a building arranged on the ship body and the ducted fan type propulsion device arranged on the ship body and/or the building, wherein when the ducted fan type propulsion device is arranged as one, the ducted fan type propulsion device is arranged on a deck at the tail part of the midline of the ship body; when the ducted fan type propulsion devices are arranged in multiple numbers, the ducted fan type propulsion devices are arranged on two sides of the ship body, and the specific arrangement positions comprise the positions on the building, two sides of the building, two side decks of the ship body and/or a tail deck of the ship body; the ship further comprises a ship host used for providing energy, the ship host is arranged inside the ship body, and the ship host can provide electric energy for the ducted fan type propulsion device.
Compared with the prior art, the invention has the following technical effects:
(1) the axial section of the annular shell of the ducted fan type propulsion device is arranged to be wing-shaped, so that the airflow resistance of the ducted fan type propulsion device is reduced when the ducted fan type propulsion device operates, and the airflow pushing efficiency can be fully improved.
(2) The ducted fan type propulsion device is in transmission-free connection with the ship host machine in a mode of adopting electric drive through the air supply assembly and the wake flow turning assembly, so that the ducted fan type propulsion device is convenient to install and control.
(3) Through the mode that sets up duct fan-type advancing device on the hull directly as the advancing device of hull, it is convenient to make new ship equipment to reduce the transformation degree of difficulty to old ship, can avoid causing the injury to aquatic biology class in the use, simultaneously because duct fan-type advancing device does not use in aqueous, so the device corrosion rate reduces, the life extension, and then reduce material cost.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a block diagram of a ducted fan propulsion unit mounted on a hull;
FIG. 2 is a view of the axial cross section of the ducted fan propulsion unit;
FIG. 3 is a structural view of a ducted fan-type propulsion unit with a steering device employing rack gear;
FIG. 4 is a transverse cross-sectional view of the rudder blade;
FIG. 5 is a block diagram of the ducted fan propulsion unit after installation of the containment vessel;
the system comprises a ship body, a building, a ducted fan type propulsion device, a 4-annular shell, a fan blade, a 6-rudder blade, a 7-front rotating shaft, an 8-built-in motor, a 9-tail shell, a 10-fixing frame, a 11-grid, a 12-shaft hole, a 13-base, a 14-rudder shaft, a 15-rack seat, a 16-rack, a 17-direction wheel, an 18-driving wheel, a 19-direction motor and a 20-protective shell.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a ducted fan type propulsion device and a ship, which are used for solving the problems in the prior art, so that reverse airflow generated by the ducted fan type propulsion device provides power, the operation convenience and the installation convenience are improved, and underwater organisms are prevented from being damaged.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Please refer to fig. 1-5.
Example one
As shown in fig. 1-2, the present embodiment provides a ducted fan propulsion device, which is applied to a ship, where the ship includes a hull 1, the ducted fan propulsion device 3 includes an annular housing 4, an air supply assembly and a wake diversion device, the air supply assembly is disposed inside the annular housing 4, the air supply assembly includes a fan, the fan is disposed in the annular housing 4 and coaxial with the annular housing 4 to generate an air flow along an axial direction of the annular housing 4, and the wake diversion device is disposed at a tail of the annular housing 4; the axial section of the annular shell 4 is a wing-shaped section, the front end of the wing-shaped section is smooth and round, the rear end of the wing-shaped section is in a sharp angle shape, the front end of the wing-shaped section is a windward side, and the rear end of the wing-shaped section is a leeward side, so that the outlet of the annular shell 4 where the front end of the wing-shaped section is located is an air inlet, and the outlet of the annular shell 4 where the rear end of the wing-shaped section is located is an air outlet, so that; the wake flow turning device comprises a rudder blade 6 and a turning device for driving the rudder blade 6 to rotate, two ends of the rudder blade 6 are rotatably arranged on the annular shell 4, the included angle between the rudder blade 6 and the axis of the annular shell 4 is changed, airflow flowing out of the annular body is guided, and the direction of the airflow is changed, so that the direction of the airflow reverse thrust is changed, and the movement direction of the ducted fan type propulsion device 3 is changed.
When the ducted fan type propulsion device 3 works, the air supply assembly generates airflow in the direction from the air inlet to the air outlet of the annular shell 4 in the annular shell 4, when the ducted fan type propulsion device 3 is along a straight line, the included angle between the rudder blade 6 and the axis of the annular shell 4 is adjusted to be 0 degree, the airflow is kept to move along the axis of the annular shell 4, and the ducted fan type propulsion device 3 performs forward linear motion under the action of reverse thrust of the airflow; when the ducted fan type propulsion device 3 needs to change direction, the direction of the rudder blade 6 is adjusted to enable the air flow at the air outlet to move towards the direction to be rotated, and then the ducted fan type propulsion device 3 rotates towards the direction to be rotated under the action of reverse thrust of the air flow; the air supply assembly can also supply air to the reverse direction to generate air flow from the air inlet to the air inlet direction so as to realize backward movement of the ducted fan type propulsion device 3.
Example two
As shown in fig. 2 to 5, the present embodiment provides a ducted fan propulsion device, and on the basis of the first embodiment, the ducted fan propulsion device of the present embodiment further has the following features:
in order to improve the air supply efficiency, the air supply assembly comprises a fan and an internal motor 8 in transmission connection with the fan, the internal motor 8 is used for driving the fan to rotate in the positive and negative directions so as to change the air flow direction, the fan is arranged in the annular shell 4 and is coaxial with the annular shell 4, the fan is arranged in the middle of the annular shell 4 and is at the position with the smallest inner diameter, the axial cross section of the annular shell 4 is an airfoil section, so that the inner diameters in the annular shell 4 are different, and the air flow at the position with the smallest inner diameter of the annular shell 4 is most concentrated, so that the fan can fully utilize the air flow in the annular shell 4, and the air supply efficiency is improved.
Furthermore, the ducted fan propulsion device 3 further comprises a mounting frame 10; the fan comprises a front rotating shaft 7 and a plurality of fan blades 5 arranged on the front rotating shaft 7, the built-in motor 8 and one end of the front rotating shaft 7, which is far away from the air inlet, are coaxially and fixedly connected, the tail part of the front rotating shaft 7 is coaxially connected with a tail casing 9 for fixing the built-in motor 8, the tail casing 9 is fixed by a fixing frame 10, the axial section of the front rotating shaft 7 and the tail casing 9 after being connected is an airfoil section, and the cross section of the fan blades 5 is an airfoil section so as to reduce the airflow resistance of parts in the ducted fan type propelling device 3.
As shown in fig. 2-4, the cross section of the rudder blade 6 is an airfoil section, and one end of the rudder blade 6 is provided with a steering wheel 17; the steering device comprises a direction motor 19 and a driving wheel 18 fixedly connected with the direction motor 19, the driving wheel 18 is in transmission connection with a direction wheel 17, the rudder blade 6 is fixedly connected with a rudder shaft 14, and the upper end part of the rudder shaft 14 is provided with the direction wheel 17; the annular shell 4 is provided with a corresponding shaft hole 12 or shaft seat at the air outlet, and two ends of the rudder shaft 14 are respectively arranged on the shaft hole 12 or the shaft seat, so that the rudder shaft 14 can rotate in the shaft seat or the shaft hole 12. The direction wheel 17 and the driving wheel 18 can be chain wheels or gears, when the direction wheel 17 is a gear, the steering driving mechanism further comprises a rack 16, and the rack 16 is in meshing transmission with the driving wheel 18 and the direction wheel 17; when the direction wheel 17 is a chain wheel, the steering driving mechanism further comprises a chain, the chain is in meshed transmission with the driving wheel 18 and the direction wheel 17, when the angle of the rudder blade 6 is adjusted, the direction motor 19 is started to drive the driving wheel 18 to rotate, and then the direction wheel 17 is driven to rotate under the transmission of the chain or the rack 16, so that the guide angle of the rudder blade 6 is changed, the rudder blade 6 can be adjusted within the range of minus 30 degrees to plus 30 degrees by taking the axis of the annular shell 4 as a reference, and the included angle between the rear end of the airfoil section of the rudder blade 6 and the axis of the annular shell 4 is adjusted.
Furthermore, as shown in fig. 5, the ducted fan propulsion device 3 further includes a protective casing 20 for protecting the steering device, the protective casing 20 is fixedly disposed outside the annular casing 4, the inner side wall of the protective casing 20 is provided with a support of the direction motor 19 and a rack seat 15, and the rack 16 is slidably mounted on the rack seat 15.
A grating 11 is arranged on one side of an air inlet of the annular shell 4, the grating 11 is used for preventing sundries from entering the annular shell 4, and meanwhile, the vortex in the incoming flow can be crushed to protect the safety of the ducted fan type propulsion unit 3, the grating 11 can be annular, square or honeycomb, and the grid holes in the grating 11 are not too large; however, the size of the holes is not so small that the air supply is insufficient when the holes are too small, which affects the working efficiency of the ducted fan propulsion unit 3.
The built-in motor 8 and the steering driving motor can be started by manual control or electric control, when the motors are in electric control, the built-in motor 8 and the steering driving motor are both electrically connected with the controller, and the controller is used for controlling the built-in motor 8 and the steering driving motor to act so as to adjust the airflow direction of the fan and the guide angle of the rudder blade 6.
A base 13 is also provided on the annular housing 4 of the ducted fan propulsion device 3, the base 13 being located on the opposite side of the containment housing 20 for mounting the ducted fan propulsion device 3 on other devices.
EXAMPLE III
As shown in fig. 1, the present embodiment provides a ship, and on the basis of the first embodiment or the second embodiment, the ship of the present embodiment further has the following features:
the ship can be in any ship form with a ship body 1 structure, and can comprise a ship body, a ship host, a building arranged on the ship body and a ducted fan type propulsion device arranged on the ship body and/or the building, wherein the ship host is arranged in the ship body and comprises a power machine and a generator, the power machine is in transmission connection with the generator to enable the generator to generate electric energy so as to enable the ship host to provide electric energy for other equipment, the power machine can be a gas turbine, a steam turbine, a diesel engine, a combined power device and a nuclear power device, and when the ducted fan type propulsion device 3 is one, the ducted fan type propulsion device 3 is arranged at the tail position of the center line of the ship body 1 so as to ensure that the thrust of the ducted fan type propulsion device 3 on the ship body 1 is uniform; when the ducted fan propulsion devices 3 are arranged in a plurality of ways, the ducted fan propulsion devices 3 are symmetrically or asymmetrically arranged at two sides of the center line of the ship body 1, the arrangement positions can be on the building 2, two sides of the building 2, two side decks of the ship body 1 and/or the tail deck of the ship body 1, in order to ensure the dynamic balance of two sides of the ship, the ducted fan propulsion devices 3 are preferably symmetrically arranged at two sides of the center line of the ship body 1, and because the positions above the building 2 are higher and the influence of the borne wind power is large, when the ducted fan propulsion devices 3 are installed above the building 2, the problems of inconvenience in installation and instability after installation are easily caused, so the ducted fan propulsion devices are preferably installed at the tail decks of the ship body 1, the two side decks of the ship body 1 and two sides of the building 2.
The ducted fan type propulsion unit 3 can be directly mounted on the ship body 1 to drive the ship body 1, so that the assembly efficiency and convenience of the ship are improved, a shaft hole for placing a rudder shaft is prevented from being formed in the bottom of the ship body 1, and the sealing performance of the ship body 1 is guaranteed; the ducted fan type propulsion device 3 is provided with the direction changing control device, so that the transmission connection between the direction changing device and the ship host is avoided, and the installation convenience of the ducted fan type propulsion device 3 is further improved on the basis of improving the operation convenience; when using duct fan propulsion unit 3 to improve current old ship, duct fan propulsion unit 3 direct mount can realize independent drive boats and ships motion on the old ship promptly, or cooperates the original power device of old ship to drive, has improved the convenience that old ship reformed transform.
The ship main engine supplies power to the ducted fan type propulsion unit 3. The ship is also provided with a master controller, the master controller is electrically connected with the controller of the ducted fan propulsion device 3 on the ship and is used for controlling the controllers of all the ducted fan propulsion devices 3 on the ship.
When the ship runs in a straight line, the main controller controls the fan to rotate in the forward direction, so that the ducted fan type propulsion device 3 generates airflow moving towards a tail deck of the ship body 1, and simultaneously controls the rudder blade 6 to keep an included angle of 0 degree with the annular shell 4, so that the ship moves forwards under the action of reverse thrust of the airflow; when the ship runs leftwards, the main controller controls the direction motor 19 to be started, so that the angle of the rudder blade 6 is adjusted to 0-minus 30 degrees, the air flow direction is turned to the left angle of the tail part of the air outlet, and the ship moves leftwards and forwards under the action of reverse thrust of the air flow; when the ship runs rightwards, the main controller controls the direction motor 19 to be started, so that the angle of the rudder blade 6 is adjusted to 0 to +30 degrees, the air flow direction is turned to the right angle of the tail part of the air outlet, and the ship moves rightwards and forwards under the action of reverse thrust of the air flow; when the ship reverses, the main controller controls the fan to rotate reversely, so that the ducted fan type propulsion device 3 generates airflow moving towards the head of the ship, and simultaneously controls the rudder blade 6 to keep an included angle of 0 degree with the annular shell 4, so that the ship moves backwards under the action of reverse thrust of the airflow.
The steering of the ship is completely realized by controlling the rudder blade 6 to change the direction of the airflow by the controller, so that the steering of the ship is avoided being manually controlled, and the operation convenience of the ship is improved; and the ducted fan type propulsion unit 3 is not in water, so that the pollution caused by lubricating oil leaking into water is avoided, meanwhile, the influence of animal and plant or fish net winding in lakes and oceans is avoided, and the damage to fishes is avoided. Compared with a propeller used in water, the ducted fan type propulsion unit 3 is easier in material selection, treatment and processing, greatly reduces the corrosion speed, prolongs the service life and further reduces the material cost.
The adaptation according to the actual needs is within the scope of the invention.
The principle and the implementation mode of the invention are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (10)
1. A ducted fan type propelling device is characterized by comprising an annular shell, an air supply assembly and a wake flow direction changing device, wherein the air supply assembly is arranged in the annular shell, the wake flow direction changing device is arranged at the tail of the annular shell, the axial section of the annular shell is an airfoil section, the air supply assembly comprises a fan, and the fan is arranged in the annular shell and is coaxial with the annular shell;
the wake flow direction changing device comprises a rudder blade and a steering device for driving the rudder blade to rotate, and two ends of the rudder blade are rotatably arranged on the annular shell so as to change the movement direction of the ducted fan type propelling device.
2. The ducted fan propulsion device according to claim 1, further comprising an internal electric motor drivingly connected to the fan, the internal electric motor being configured to drive the fan in both forward and reverse directions, the fan being disposed in the middle of the annular housing and being located at a position of minimum inner diameter.
3. The ducted fan propulsion device according to claim 1, further comprising a mount; the fan comprises a front rotating shaft and a plurality of fan blades arranged on the front rotating shaft, the built-in motor is coaxially and fixedly connected with one end of the front rotating shaft, which is far away from the air inlet, the tail part of the front rotating shaft is coaxially connected with a tail casing for fixing the built-in motor, and the tail casing is fixed in the annular casing through the fixing frame.
4. The ducted fan propulsion device according to claim 3, characterised in that the axial section after the connection of the front rotor shaft and the tail casing and the cross section of the fan blades are both aerofoil sections.
5. The ducted fan propulsion device according to claim 1, characterised in that the rudder blade is provided with a directive wheel at one end; the steering device comprises a direction motor and a driving wheel fixedly connected with the direction motor, and the driving wheel is in transmission connection with the direction wheel.
6. The ducted fan propulsion device according to claim 5, characterised in that a rudder shaft is fixedly connected to the rudder blade, the end of the rudder shaft being provided with the steering wheel; the annular shell is provided with an upper shaft hole and a lower shaft hole which correspond to each other at the air outlet, and two ends of the rudder shaft are respectively arranged on the upper shaft hole and the lower shaft hole; the cross section of the rudder blade is an airfoil section.
7. The ducted fan propulsion device according to claim 6, wherein the steering wheel and the drive wheel are both gears, the steering drive mechanism further comprising a rack, the rack being in meshing transmission with the drive wheel and the steering wheel.
8. The ducted fan propulsion device according to claim 7, further comprising a protective housing for protecting the steering device, wherein the protective housing is fixedly disposed outside the annular housing, a rack holder and a direction motor support are mounted on an inner side wall of the protective housing, the rack holder slidably mounts the rack, and the motor support is used for mounting the direction motor.
9. The ducted fan propulsion device according to claim 1, characterised in that the annular housing is provided with a grating on the side of the air inlet, the grating comprising an annular, square or honeycomb shape.
10. A ship to which the ducted fan propulsion device according to any one of claims 1 to 9 is applied, comprising a hull, a building provided on the hull, and the ducted fan propulsion device provided on the hull and/or the building, the ducted fan propulsion device being provided on a centerline aft deck of the hull when the ducted fan propulsion device is provided as one; when the ducted fan type propulsion devices are arranged in multiple numbers, the ducted fan type propulsion devices are arranged on two sides of the ship body, and the specific arrangement positions comprise the positions on the building, two sides of the building, two side decks of the ship body and/or a tail deck of the ship body; the ship further comprises a ship host arranged inside the ship body, and the ship host can provide electric energy for the ducted fan type propulsion device.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010363087.4A CN111409804A (en) | 2020-04-30 | 2020-04-30 | Ducted fan type propulsion device and ship |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010363087.4A CN111409804A (en) | 2020-04-30 | 2020-04-30 | Ducted fan type propulsion device and ship |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112644674A (en) * | 2020-12-28 | 2021-04-13 | 胡翔 | Boat driven by wind power |
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2020
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112644674A (en) * | 2020-12-28 | 2021-04-13 | 胡翔 | Boat driven by wind power |
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