US20130120874A1 - Aerodynamic device for aerostatic sealing in a hard disk drive (hdd) - Google Patents
Aerodynamic device for aerostatic sealing in a hard disk drive (hdd) Download PDFInfo
- Publication number
- US20130120874A1 US20130120874A1 US13/707,311 US201213707311A US2013120874A1 US 20130120874 A1 US20130120874 A1 US 20130120874A1 US 201213707311 A US201213707311 A US 201213707311A US 2013120874 A1 US2013120874 A1 US 2013120874A1
- Authority
- US
- United States
- Prior art keywords
- hard disk
- disk drive
- vacuum pressure
- aerodynamic device
- hdd
- 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.)
- Abandoned
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Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B33/00—Constructional parts, details or accessories not provided for in the other groups of this subclass
- G11B33/14—Reducing influence of physical parameters, e.g. temperature change, moisture, dust
- G11B33/148—Reducing friction, adhesion, drag
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B25/00—Apparatus characterised by the shape of record carrier employed but not specific to the method of recording or reproducing, e.g. dictating apparatus; Combinations of such apparatus
- G11B25/04—Apparatus characterised by the shape of record carrier employed but not specific to the method of recording or reproducing, e.g. dictating apparatus; Combinations of such apparatus using flat record carriers, e.g. disc, card
- G11B25/043—Apparatus characterised by the shape of record carrier employed but not specific to the method of recording or reproducing, e.g. dictating apparatus; Combinations of such apparatus using flat record carriers, e.g. disc, card using rotating discs
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B33/00—Constructional parts, details or accessories not provided for in the other groups of this subclass
- G11B33/14—Reducing influence of physical parameters, e.g. temperature change, moisture, dust
- G11B33/1486—Control/regulation of the pressure, e.g. the pressure inside the housing of a drive
Abstract
An aerodynamic device for aerostatic sealing in a hard disk drive (HDD) comprising an exterior surface configured to modify airflow in the hard disk drive and proximate at least one magnetic disk, a plurality of inlet ports disposed on the exterior surface configured to intake air away from the at least one magnetic disk and aerostatically seal the aerodynamic device with the at least one magnetic disk and a single outlet port configured to discharge the intake air.
Description
- This application is a divisional application of co-pending U.S. patent application Ser. No. 12/648,969, filed on Dec. 29, 2009, entitled “AERODYNAMIC DEVICE DIRECTING PRESSURIZED AIRFLOW TO PORTS IN THE DEVICE FOR AEROSTATIC SEALING IN A HARD DISK DRIVE(HDD),” by Hendriks et al., having Attorney Docket No. HSJ920090050US1, and assigned to the assignee of the present application.
- This Application is related to U.S. patent application Ser. No. 12/649,097 entitled Air Pump in a Hard Disk Drive (HDD), by Ferdinand Hendriks, attorney docket number HSJ920090050US2, assigned to the assignee of the present invention, filed Dec. 29, 2009, and which is incorporated by reference in its entirety herein.
- Embodiments of the present technology relate generally to the field of hard disk drives.
- Airflow caused by the rotation of disks in a hard disk drive (HDD) causes turbulence which can deleteriously affect the read/write function of the HDD. Conventional technology attempts to limit the velocity of the airflow within the HDD, especially in the region of the read/write head, by placing aerodynamic parts (e.g., diverters, spoilers, damper plates, etc.) in close proximity and/or in between to the disks. However, there must always be a clearance between the aerodynamic part and the disks, because the disks will fail if any part within the HDD physically contacts the disks. Moreover, passive clearances often occupy as much as 50% of the disk/disk clearance or the disk/cover and disk/base casting clearance.
-
FIG. 1 illustrates an example of a HDD, in accordance with an embodiment of the present invention. -
FIG. 2 illustrates an example of aerostatic sealing, in accordance with an embodiment of the present invention. -
FIG. 3 illustrates an example of aerostatic sealing, in accordance with an embodiment of the present invention. -
FIG. 4 illustrates an example of an air pump, in accordance with an embodiment of the present invention. -
FIG. 5 illustrates an example of an air pump, in accordance with an embodiment of the present invention. -
FIG. 6 illustrates an example of an air pump, in accordance with an embodiment of the present invention. - The drawings referred to in this description should be understood as not being drawn to scale except if specifically noted.
- Reference will now be made in detail to embodiments of the present technology, examples of which are illustrated in the accompanying drawings. While the technology will be described in conjunction with various embodiment(s), it will be understood that they are not intended to limit the present technology to these embodiments. On the contrary, the present technology is intended to cover alternatives, modifications and equivalents, which may be included within the spirit and scope of the various embodiments as defined by the appended claims.
- Furthermore, in the following description of embodiments, numerous specific details are set forth in order to provide a thorough understanding of the present technology. However, the present technology may be practiced without these specific details. In other instances, well known methods, procedures, components, and circuits have not been described in detail as not to unnecessarily obscure aspects of the present embodiments.
- In general, aerodynamic parts are configured to deflect, block, seal or otherwise inhibit airflow in the disk and actuator region and consequently reduce turbulence in the disk and actuator region. There must always be a clearance between the disks and the aerodynamic parts because the disks can fail if the aerodynamic parts come into physical contact with the disks. However, the necessary clearance (a gap between the aerodynamic part and the disks) provides a poor seal between the aerodynamic parts and the disks because there is considerable leakage.
- With reference now to
FIG. 1 , a schematic drawing of one embodiment of an information storage system including a magnetic hard disk file orHDD 110 for a computer system is shown, although only one head and one disk surface combination are shown. What is described herein for one head-disk combination is also applicable to multiple head-disk combinations. In other words, the present technology is independent of the number of head-disk combinations. - In general, HDD 110 has an
outer housing 113 usually including a base portion (shown) and a top or cover (not shown). In one embodiment,housing 113 contains a disk pack having at least one media ormagnetic disk 138. The disk pack (as represented by disk 138) defines an axis of rotation and a radial direction relative to the axis in which the disk pack is rotatable. - A spindle motor assembly having a
central drive hub 130 operates as the axis and rotates thedisk 138 or disks of the disk pack in thecircumferential direction 140 relative tohousing 113. Anactuator assembly 115 includes one or moreactuator arms 116. When a number ofactuator arms 116 are present, they are usually represented in the form of a comb that is movably or pivotally mounted to base/housing 113. Acontroller 150 is also mounted tobase 113 for selectively moving theactuator arms 116 relative to thedisk 138.Actuator assembly 115 may be coupled with a connector assembly, such as a flex cable to convey data between arm electronics and a host system, such as a computer, wherein HDD 110 resides. - In one embodiment, each
actuator arm 116 has extending from it at least one cantilevered integrated lead suspension (ILS) 120. The ILS 120 may be any form of lead suspension that can be used in a data access storage device. The level of integration containing theslider 121,ILS 120, and read/write head is called the Head Gimbal Assembly (HGA). - The ILS 120 has a spring-like quality, which biases or presses the air-bearing surface of
slider 121 againstdisk 138 to causeslider 121 to fly at a precise distance fromdisk 138. ILS 120 has a hinge area that provides for the spring-like quality, and a flexing cable-type interconnect that supports read and write traces and electrical connections through the hinge area. Avoice coil 112, free to move within a conventional voice coil motor magnet assembly is also mounted toactuator arms 116 opposite the head gimbal assemblies. Movement of theactuator assembly 115 bycontroller 150 causes the head gimbal assembly to move along radial arcs across tracks on the surface ofdisk 138. - In one embodiment, HDD includes an upstream spoiler 160 (with aerostatic seals) for modifying air flow generated by the rotation of
disks 138 and for creating an aerostatic seal between itself and thedisks 138. - Aerodynamic Devices for Aerostatic Sealing
-
FIG. 2 illustratesaerodynamic device 210 for aerostatic sealing in a HDD, in accordance with an embodiment of the present invention.FIG. 2 depicts anaerodynamic device 210 for modifying air flow generated by the rotation ofdisks 138 and for creating an aerostatic seal between itself and thedisks 138.Aerodynamic device 210 includes aninlet port 215 configured to receivepressurized air flow 240 and a plurality ofoutlet ports 220 configured to discharge the pressurizedair flow 240 from within the aerodynamic device. - In various embodiments,
aerodynamic device 210 is any aerodynamic device configured to modify airflow in the HDD and located proximate at least one disk in the HDD. For example,aerodynamic device 210 is a damper plate that is disposed between two disks.Aerodynamic device 210 can be a diverter which diverts airflow away (e.g., to a bypass channel) from the disk region. Aerodynamic device can be a spoiler (e.g., upstream or downstream). In one embodiment, aerodynamic device can be disposed in between at least two disks of a plurality of disks. In another embodiment, aerodynamic device is disposed in between all of the disks in the HDD. In further embodiments, a plurality of aerodynamic devices are disposed in between at least two disks of a plurality of disks or disposed in between all of the disks in the HDD. - The pressurized
air 240 that exitsoutlet ports 220 is discharged directly at thedisks 138. The pressurizedair 240 discharged in the direction ofdisks 138 increases the drag of the aerodynamic device and causes anaerostatic seal 230 between theaerodynamic device 210 and thedisks 138. Anaerostatic seal 230 is a non-contact seal. In other words, the discharged pressurizedair 240 directed at thedisks 138 allows for a mechanical clearance between theaerodynamic device 210 and thedisks 138 while also sealing the clearance. For example, turbulent air outside the disk region is prohibited by theaerostatic seal 230 from leaking past the disks and/or in between the disks through the clearance. Likewise, stable air flow in between thedisks 138 is sealed in between the disks by theaerostatic seal 230. Thus, making the HDD aerodynamic parts more effective. - It should be appreciated that any number of outlet and
inlet ports 220 can be formed in any orientation on theaerodynamic device 210. For example,outlet ports 220 can dischargepressurized air 240 orthogonal to the data surface of thedisks 138. In another embodiment,outlet ports 220 can dischargepressurized air 240 parallel the data surface of the disks. It should be appreciated that the outlet ports can dischargepressurized air 240 at any angle with respect to the data surface of the disks. - The
pressurized air flow 240 is generated inside the HDD. In one embodiment, thepressurized air flow 240 is generated by a pressure difference inside the HDD. For example,pressurized airflow 240 can travel from a location of high pressure to theinlet port 215, via ducting, if the pressure at theinlet port 215 is lower than that at the location of high pressure. In another embodiment, thepressurized air flow 240 is generated by an air pump inside the HDD, which is described in detail below. It should also be appreciated that a suction (e.g., flow from theoutlet ports 220 to the inlet port 215) through theoutlet ports 220 also creates anaerostatic seal 230 between theaerodynamic device 210 anddisks 138. -
FIG. 3 illustratesaerodynamic device 210 for aerostatic sealing in a HDD, in accordance with an embodiment of the present invention. It should be appreciated that the only difference betweenFIG. 3 andFIG. 2 is that air is sucked throughinlet ports 320 compared to being discharged throughoutlet ports 220 ofFIG. 2 . Accordingly, the aerostatic sealing illustrated inFIG. 3 is accomplished by an opposite flow of air throughaerodynamic device 210 as compared toFIG. 2 . In other words, aerostatic sealing is accomplished by air being suctioned or vacuumed intointake ports 320 and the suctioned air exitsoutput port 315. Therefore,aerostatic seal 230 is accomplished byvacuum pressure 340 that vacuums or sucks air intoinlet ports 320 and out ofoutlet port 315. - Air Pump Inside HDD
-
FIGS. 4-6 illustrate an air pump that generates air pressure, in accordance with an embodiment of the present invention. In various embodiments, the air pumps can be run in reverse and create a vacuum or suction pressure.FIG. 4 shows an exploded view ofmotor 400 that includes a motor spindle orrotor 410 and a base orstator 440. For purposes of brevity and clarity, only features applicable for the generation of air pressure in the HDD are included.Rotor 410 includes an air pressure generating feature. For example, pocketedregion 420 of therotor 410 includes a series ofpockets 430 circumscribing the pocketed region. Thestator 440 includes acontinuous channel 450 circumscribing the pocketed region of the stator. Thechannel 450 includes aninlet port 454 and anoutlet port 452. - The series of
pockets 430 is opposed to thechannel 450. Thechannel 450 is an air pressure generating feature that corresponds to pockets 430. Accordingly, as therotor 410 rotates with respect tostator 440, thepockets 430 entrain air through theinlet port 454. The air in eachpocket 430 progressively becomes compressed as it travels along thechannel 450. As the pockets of compressed air passes over theoutlet port 452, the pressurized air in the pockets discharges through theoutlet port 452. Thepressurized air 460 can be delivered to any part of the HDD via ducting. In one embodiment,pressurized air 460 is 500 to 2000 Pascals (Pa) or 50 to 200 millimeters (mm) H2O. Thepockets 430 can be any shape (e.g., scallop) that allows for air to circulate through the pockets and subsequently become compressed and exit theoutlet port 452. It should be appreciated that the air pressure is generated at a location where the air pressure generating feature of the rotor rotates in proximity to the air pressure generating feature of the stator. - The clearance between the
rotor 410 and thestator 440 can also cause leakage and accordingly loss of pressure. Leakage can be minimized by techniques such as but not limited to labyrinth seals. In one embodiment, the clearance between the rotor and the stator in the labyrinth region is 0.2 mm. - In one embodiment, the
rotor 410 andstator 440, in combination, act as a regenerative disk or friction pump. The pressure created by the regenerative disk or friction pump can cause an axial force on the rotor which is approximately equal to the average pressure on thestator 440. It should also be appreciated that therotor 410 andstator 440, can work in reverse. -
FIG. 5 depicts anair pump 500, in accordance with an embodiment of the present invention.Air pump 500 includes a motor spindle orrotor 510, a base orstator 540,anti-vibration coupling 520 andwobbler 530. In one embodiment,rotor 510 is a fluid dynamic bearing (FDB).Wobbler 530 is configured to convert the rotary motion of therotor 510 into an orbiting motion. -
Anti-vibration coupling 520 is configured to reduce vibration during the conversion of rotary motion into orbiting motion. In general, thewobbler 530 and thestator 540 have corresponding interleaved scrolls (not shown) that pump, compress, or pressurize air that is provided atintake 550. It should be appreciated that therotor 510 andwobbler 530, in combination, includes an air pressure generating feature (e.g., scroll). Also, the stator includes an air generating feature (e.g., scroll). Often, one of the scrolls is fixed, while the other orbits eccentrically without rotating, thereby trapping and pumping or compressing pockets of fluid between the scrolls. The vane geometry of the scrolls (not shown) may be involute, archimedean spiral, or hybrid curves. It should be appreciated that the air pressure is generated at a location where the air pressure generating feature of the wobbler orbits in proximity to the air pressure generating feature of the stator. - Balancing of the
motor 500 can be accomplished by operating two opposing pumps. In one embodiment,air pump 500 is a scroll pump. It should be appreciated that pressurized air generated byair pump 500 can be delivered to any part of the HDD via ducting. In one embodiment, the pressurized air is 500 to 2000 Pa or 50 to 200 mm H2O. -
FIG. 6 depicts anair pump 600, in accordance with an embodiment of the present invention.Air pump 600 includes arotor 610. In one embodiment,rotor 610 is a FDB.Rotor 610 includes an air pressure generating feature. For example, a plurality ofbuckets 610 circumscribing therotor 610. Asrotor 610 rotates, the plurality ofbuckets 620 collects air. In one embodiment, air is collected throughinlet port 640, is pressurized and discharged out ofoutlet port 630. In one embodiment,air pump 600 is a Pelton wheel. The pressurized air generated byair pump 600 can be delivered to any part of the HDD via ducting. In one embodiment, the pressurized air is 500 to 2000 Pa or 50 to 200 mm H2O. It should be appreciated that the air pressure is generated at a location where the air pressure generating feature of the rotor rotates in proximity to the air pressure generating feature of the stator. - The air pressure created by air pumps depicted in
FIGS. 4-6 can be directed via ducting to anywhere inside the HDD. In one embodiment, the air pressure is thepressurized air flow 240 utilized to create theaerostatic seals 230, as described above. The air pumps, as with most pumps, can work in reverse. In one embodiment, the air pressure created by the air pumps depicted inFIGS. 4-6 is a vacuum pressure (e.g., 340) utilized to create theaerostatic seals 230, as described above. - Moreover, air pressure created within the HDD can also be used for levitation of components inside the HDD. Typically, a
slider 121 travels over a load/unload ramp (not shown) when moving from a resting position to a read/write position over the disk. In one embodiment, air pressure can be directed to theslider 121, via ducting, as the slider travels over the load/unload ramp and thereby levitating theslider 121. Accordingly, the levitation of theslider 121 will reduce friction and thereby reduce any vibrations due to the friction of the load/unload ramp. - Various embodiments of the present invention are thus described. While the present invention has been described in particular embodiments, it should be appreciated that the present invention should not be construed as limited by such embodiments, but rather construed according to the following claims.
Claims (17)
1. An aerodynamic device for aerostatic sealing in a hard disk drive (HDD) comprising:
an exterior surface configured to modify airflow in said hard disk drive and proximate at least one magnetic disk;
a plurality of inlet ports disposed on said exterior surface configured to intake air away from said at least one magnetic disk and aerostatically seal said aerodynamic device with said at least one magnetic disk; and
a single outlet port configured to discharge said intake air.
2. The device of claim 1 , wherein said plurality of inlet ports on said exterior surface are configured to intake air away from a plurality of disks and aerostatically seal said aerodynamic device with said plurality of disks.
3. The device of claim 1 , wherein at least two of said plurality of inlet ports intake air in opposite directions.
4. The device of claim 1 , wherein said aerodynamic device is selected from a group consisting of: upstream spoiler, downstream spoiler, slit shroud, diverter, damper plate or disk shroud.
5. The device of claim 1 , comprising:
vacuum pressure produced by an air pump in said hard disk drive.
6. The device of claim 1 , comprising:
vacuum pressure produced by a pressure difference in said hard disk drive.
7. An air pump for generating a vacuum pressure in a hard disk drive (HDD) comprising:
a rotor disposed inside said HDD, wherein said rotor comprises a first vacuum pressure generating feature; and
a stator, wherein said stator comprises a second vacuum pressure generating feature, wherein said first vacuum pressure generating feature corresponds with said second vacuum pressure generating feature and said vacuum pressure is generated at a location where said first vacuum pressure generating feature travels in proximity to said second vacuum pressure generating feature.
8. The air pump of claim 7 , wherein said vacuum pressure is directed to an aerodynamic device and aerostatically seals said aerodynamic device with at least one disk.
9. The air pump of claim 7 , wherein said air pump is selected from a group consisting of: a regenerative pump, a scroll pump or Pelton wheel.
10. The air pump of claim 7 , wherein said first vacuum pressure generating feature comprises:
a plurality of pockets circumscribing said rotor at a pocketed region.
11. The air pump of claim 7 , wherein said second vacuum pressure generating feature comprises:
a channel circumscribing said stator at a pocketed region.
12. A hard disk drive comprising:
at least one magnetic disk;
an aerodynamic device disposed proximate to said at least one magnetic disk configured to configured to modify airflow in said hard disk drive, said aerodynamic device comprising:
an exterior surface configured to modify airflow in said hard disk drive and proximate said at least one magnetic disk;
a plurality of inlet ports disposed on said exterior surface configured to intake air away from said at least one magnetic disk and aerostatically seal said aerodynamic device with said at least one magnetic disk; and
a single outlet port configured to discharge said intake air.
13. The hard disk drive of claim 12 , wherein said plurality of inlet ports on said exterior surface are configured to intake air away from a plurality of disks and aerostatically seal said aerodynamic device with said plurality of disks.
14. The hard disk drive of claim 12 , wherein at least two of said plurality of inlet ports intake air in opposite directions.
15. The hard disk drive of claim 12 , wherein said aerodynamic device is selected from a group consisting of: upstream spoiler, downstream spoiler, slit shroud, diverter, damper plate or disk shroud.
16. The hard disk drive of claim 12 , comprising:
vacuum pressure produced by an air pump in said hard disk drive.
17. The hard disk drive of claim 12 , comprising:
vacuum pressure produced by a pressure difference in said hard disk drive.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/707,311 US20130120874A1 (en) | 2009-12-29 | 2012-12-06 | Aerodynamic device for aerostatic sealing in a hard disk drive (hdd) |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/648,969 US8345377B2 (en) | 2009-12-29 | 2009-12-29 | Aerodynamic device directing pressurized airflow to ports in the device for aerostatic sealing in a hard disk drive(HDD) |
US13/707,311 US20130120874A1 (en) | 2009-12-29 | 2012-12-06 | Aerodynamic device for aerostatic sealing in a hard disk drive (hdd) |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/648,969 Division US8345377B2 (en) | 2009-12-29 | 2009-12-29 | Aerodynamic device directing pressurized airflow to ports in the device for aerostatic sealing in a hard disk drive(HDD) |
Publications (1)
Publication Number | Publication Date |
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US20130120874A1 true US20130120874A1 (en) | 2013-05-16 |
Family
ID=44187259
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
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US12/648,969 Expired - Fee Related US8345377B2 (en) | 2009-12-29 | 2009-12-29 | Aerodynamic device directing pressurized airflow to ports in the device for aerostatic sealing in a hard disk drive(HDD) |
US13/707,311 Abandoned US20130120874A1 (en) | 2009-12-29 | 2012-12-06 | Aerodynamic device for aerostatic sealing in a hard disk drive (hdd) |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
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US12/648,969 Expired - Fee Related US8345377B2 (en) | 2009-12-29 | 2009-12-29 | Aerodynamic device directing pressurized airflow to ports in the device for aerostatic sealing in a hard disk drive(HDD) |
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US (2) | US8345377B2 (en) |
Families Citing this family (1)
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US9666235B2 (en) | 2015-10-13 | 2017-05-30 | Seagate Technology Llc | Particulate filter |
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US6791790B2 (en) * | 2002-02-14 | 2004-09-14 | Samsung Electronics Co., Ltd. | Hard disk drive having air pumping groove |
US7099109B2 (en) * | 2002-03-25 | 2006-08-29 | Samsung Electronics Co., Ltd. | Hard disk drive having air flow accelerating device |
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US8345377B2 (en) | 2013-01-01 |
US20110157744A1 (en) | 2011-06-30 |
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STCB | Information on status: application discontinuation |
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