WO2003053805A1 - Enveloppe etanche pour la protection d'objet aux variations de depressurisation - Google Patents
Enveloppe etanche pour la protection d'objet aux variations de depressurisation Download PDFInfo
- Publication number
- WO2003053805A1 WO2003053805A1 PCT/FR2002/004271 FR0204271W WO03053805A1 WO 2003053805 A1 WO2003053805 A1 WO 2003053805A1 FR 0204271 W FR0204271 W FR 0204271W WO 03053805 A1 WO03053805 A1 WO 03053805A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- envelope
- depressurization
- protection
- walls
- hard disk
- Prior art date
Links
- 238000007789 sealing Methods 0.000 title abstract description 5
- 230000004224 protection Effects 0.000 claims abstract description 50
- 239000000463 material Substances 0.000 claims abstract description 31
- 238000013016 damping Methods 0.000 claims abstract description 11
- 230000035939 shock Effects 0.000 claims description 10
- 239000004809 Teflon Substances 0.000 claims description 2
- 229920006362 Teflon® Polymers 0.000 claims description 2
- 229920002994 synthetic fiber Polymers 0.000 claims description 2
- 229920001169 thermoplastic Polymers 0.000 claims description 2
- 239000004416 thermosoftening plastic Substances 0.000 claims description 2
- 239000007779 soft material Substances 0.000 claims 1
- 230000001681 protective effect Effects 0.000 abstract description 4
- 230000006870 function Effects 0.000 description 5
- 239000007787 solid Substances 0.000 description 5
- 229920002635 polyurethane Polymers 0.000 description 4
- 239000004814 polyurethane Substances 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 239000013598 vector Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/02—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using gas only or vacuum
- F16F9/04—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using gas only or vacuum in a chamber with a flexible wall
Definitions
- the invention relates to the protection of objects from severe conditions. It allows in particular the protection of objects, in particular hard disks, against depressurization.
- solid state disk-based systems are bulky (for capacities of a few GB, generally between 115 x 122 x 308 mm and 285 x 432 x 328 mm), which
- magnetic hard disks seem more advantageous in terms of space and cost. But they are sensitive to conditions of use such as vibrations, shocks, depressurizations ... In particular, magnetic disks or other electromechanical devices do not work below 700 mb approximately. However, in
- the pressure at an altitude of 30,000 m is around 25 mb.
- “hardening” type protections including shock absorbers for mechanical resistance, climatic chambers for temperature resistance, watertight chambers for depressurization. These speakers have a
- 35 limited capacity in terms of protection, especially poor protection against vibrations and protection only against depressurization low amplitude. They also have the major drawback for an on-board application of being very bulky (of the order of 200 x 300 x 254 mm). They include several cartridges (cartridge in English) for a memory capacity of approximately 150 GB.
- the present invention overcomes these drawbacks first by providing a device capable of protecting an object against depressurization, in particular an electronic unit such as, for example, a hard disk.
- This device for protecting an object against depressurization has several walls forming an envelope capable of containing the object to be protected.
- This envelope is waterproof and its walls are made of flexible material.
- the elongation and elasticity characteristics of this material can be such that the walls of the envelope oppose a restoring force to the external depressurization of the envelope allowing the internal pressure of said envelope to be kept within a range. predetermined.
- a system for protecting an object comprising the device for protection against depressurization mentioned above and, on a at least on the side of said device for protection against depressurization containing the object to be protected, a device for protection against shock and / or vibration forming a mechanical filter, of the type comprising an envelope housing a damping material.
- the material of the envelope is the same as that of the walls of the envelope of said device for protection against depressurization.
- this protection system may include a protection device and / or thermal regulation. This protection and / or thermal regulation device is placed inside the sealed envelope.
- the invention also consists of an electronic card comprising a hard disk protected against these various severe conditions (mechanical, thermal, depressurization, etc.). This protection of the hard disk is carried out using the protection device against depressurization mentioned above or the protection system mentioned above.
- FIG. 2 curve of evolution of the internal pressure of the sealed envelope according to the invention as a function of the external pressure
- FIGS. 3a and 3b curve for the evolution of the volume of the sealed envelope according to the invention as a function of the external pressure, in FIG. 3a curve and in FIG. 3b diagram of the envelope,
- FIG. 5 side view of the protection system of a hard disk according to the invention
- FIG. 6 top view of the protection system of a hard disk according to the invention implemented on a card.
- FIGS 1a and 1b schematically show an embodiment of a sealed envelope 111 for the protection of an object 112 to depressurization.
- the waterproof envelope 111 consists mainly of a wall made of flexible material. This wall of material is capable, in particular of its elongation and elasticity characteristics, of absorbing all or part of the depressurizations, while ensuring sealing.
- the elongation and elasticity characteristics of said material can be chosen such that the walls oppose a restoring force to the external depressurization of the envelope (111) allowing the internal pressure of said envelope (111) to be kept within a range predetermined.
- This wall is, for example, a wall of thermoplastic synthetic material.
- This type of material allows the total absence of maintenance thanks to the durability of the materials used (in particular polyurethane in all its forms).
- the table gives characteristics of an example of material used.
- the waterproof envelope 111 is produced around the object to be protected 112 using this material under conditions of determined pressure, called reference pressure (1000 mb for example) thereafter.
- reference pressure 1000 mb for example
- This opening 113 is made in such a way that the envelope 111 remains sealed and only allows the exchange element 114 of information and power to pass.
- FIG. 1a schematically shows an object protected against depressurization 110. This protection is ensured by a waterproof envelope 111.
- the object 112 is coupled to an exchange element 114 for information and supply .
- This device 114 allows the exchange of information between the object 112 inside the waterproof envelope 111 and any system outside the envelope 111 under depressurization conditions.
- Figure 1b shows the evolution of the sealed envelope 111 during depressurization. Due to these physical characteristics, in particular its elongation and elasticity characteristics, the waterproof envelope 111 absorbs the pressure variation by an increase in its surface area, but in a relatively small way.
- the waterproof envelope 111 whose walls are about 250 microns thick in polyurethane, will swell with a height of approximately 4 cm (if the height is its only degree of freedom). It can be envisaged that the waterproof envelope 111 has several degrees of freedom (height, width, length). In reality, the waterproof envelope 111 makes it possible to absorb a depressurization up to at least 115 mb. With the return to a reference pressure, the sealed envelope 111 regains its initial shape. The wall, made of flexible material, is assembled to give the sealed envelope 111 a selected geometry.
- the homogeneity of the entire envelope 111 makes it possible to seal it.
- the tightness of the envelope 111 as well as the vacuum inside it are tested by means of a valve 116 shown in FIG. 5.
- the valve 116 is placed on one of the walls of the envelope 111. She can be removable allowing, for example, its removal during the final mounting of the protected object 110 in its application system such as, for example, during the mounting of the protected hard disk 110 on a card 200.
- the tightness of the envelope 111 is threatened by the wires 114 allowing, for example, the exchange of information between the hard disk 112 and the electronic card 200 as in FIG. 6. Indeed, often these wires 114 are twisted copper wires trapping air in the twist. This air trapped in the wires 114 breaks the tightness of the envelope 111.
- the first end of these wires 114 is waterproof because in the waterproof envelope 111.
- the second end of these wires 114 placed on the card 200 is made waterproof using the same material used for the manufacture of the waterproof envelope 111. For example, the ends of wires 114 on the card 200 are embedded in a bubble of this material.
- the wires 114 can constitute a ply like that shown in FIG. 6.
- a retaining film 117 acting in particular as a flange is placed on the above the waterproof envelope 111.
- the wires 114 are slid between this retaining film 117 and the waterproof envelope 111.
- the material of the retaining film 117 is the same as that of the waterproof envelope 111 in order to always match said envelope waterproof 111 whatever the volume occupied by the latter and ensuring good retention of the wires 114 against the envelope 111 without the latter rubbing against the retaining film 117 or the envelope 111.
- this retaining film 117 may be those on the side of the envelope 111 on which these wires 114 are held. Thus, the risk of friction and cuts are further reduced.
- it can be envisaged to slide an intermediate film 118 between the retaining film 117 and the wires 114 to avoid friction between the wires 114 and the retaining film 117.
- This intermediate film 118 is very resistant to friction. It can be made of a slippery material: Teflon (registered trademark) for example.
- FIG. 2 shows the evolution of the internal pressure as a function of the external pressure at stabilized ambient temperature.
- the internal pressure pi varies linearly from 700 mb to 1010 mb.
- FIG. 3a shows the evolution of the volume v of the envelope 111 containing a 9.2 GB hard disk 112, in our example, as a function of the external pressure p e at stabilized ambient temperature.
- the volume of the envelope 111 varies linearly from 721 cm 3 to 1000 cm 3 .
- FIG. 4 proposes a system 110 for protecting equipment against mechanical, climatic and depressurization effects. Difficulties arise when the energies or the powers involved are significant compared to the fragile equipment to be protected. In addition, there is a delicate problem when space is not or little available. For example, when installing existing electronic cards in on-board equipment. It is necessary to protect the hard disks implemented on these cards while occupying only the existing volume.
- the protection system 110 is the cooperation of several protection devices including, in particular, a mechanical shock-absorbing device 120, a thermal protection device 115 and a device 111 ensuring operation in the same depressurization range, compatible with operation, by example, of a hard disk 112.
- a mechanical shock-absorbing device 120 a thermal protection device 115 and a device 111 ensuring operation in the same depressurization range, compatible with operation, by example, of a hard disk 112.
- the protection system of FIG. 4 comprises in particular a device ensuring operation of the hard disk 112 in the same depressurization range, for example, the waterproof envelope 111 because it allows maintenance of the internal depressurization range, while occupying a volume defines changing little. Indeed, depending on the material used to constitute the envelope, it has an increase in volume of approximately 28% of the initial volume of the waterproof envelope 111 for a depressurization of 985 mb.
- This waterproof envelope 111 is therefore a waterproof protection especially in depressurization.
- the device damping mechanical effects 120 can be, for example, that described in European patent application EP 96 402 531. This device forms a mechanical filter, in particular against strong accelerations and vibrations.
- It comprises an envelope 121 housing a damping material 122 capable of creeping with the pressure due to shocks or vibrations.
- the advantage of this damping device is that it is small in volume for high efficiency (resistance to a shock ⁇ sinus of 500 g / 3 ms).
- the thermal protection device 115 may be a thermal regulation device 115 2 maintaining the internal temperature of the sealed envelope 1 within an ideal operating temperature range determined for the object 112, for example +5 to + 60 ° C. It can also be envisaged as an element 115 ⁇ interrupting the operation of the object 112 as soon as the temperature of the object 112 is no longer within a determined limit operating temperature range of the object 112, for example interruption of the operation of the hard disk 112 as soon as the temperature is less than or equal to 0 ° C. Or again, cooperation between this element 115 and the thermal control device 115 2 .
- the element 115 ⁇ may, for example, include vigitherms and / or the device 115 2 of the heaters.
- the waterproof envelope 111 prevents heat exchange by convection, heat exchange takes place by conduction by the wires 114 of the sheet. This is why one input in two of the sheet 114 is connected to electrical zero.
- the assembly constituting the protection system 100 is of low volume and low cost due to the elementary devices used, for example: waterproof polyurethane envelope 111 in which the object 112 to be protected is inserted, for example a hard disk, damping device 120 comprising a polyurethane envelope 121 filled with a silicone gel 122 placed under the protected hard disk 110 on the one hand because it is covered by the waterproof envelope 111 and on the other hand using a thermal protection device 115 comprising heaters 115 2 and vigitherms 115 ⁇ placed inside the waterproof envelope 111 with the hard disk 112.
- a hard disk 112 thus protected by the system 100 provides the same benefits and performance as a standard hard disk by increasing its area of operation.
- FIG. 5 gives an exemplary embodiment of the protection system 100 of FIG. 4.
- the assembly constituted by the disc 112 and the thermal protection device 115 covered by the waterproof envelope 111 placed on the damping device 120 is placed in a cradle 130. It is fixed, for example by adhesion, only in its center in order to allow this damping device 120 the freedom of movement necessary for its proper functioning. For the same reasons, the dimensions of the bottom of the cradle (130) on which this damping device 120 is placed are slightly greater than those of the casing 121 of this damping device 120. The whole is unified using an adhesive (not shown) made of a material similar to that of the envelope 11 1 and of the device 120. In the system 100 proposed by the example of FIG. 5, the waterproof envelope 111 has only one degree of freedom on its vertical axis upwards.
- the envelope 111 takes up little volume downwards due to the cradle 130. It also does not take up any volume on the sides because, in the embodiment proposed in this example, the sides of the envelope 111 have thickness double compared to the thickness of its upper wall, that is to say that, if the upper wall has a thickness of 250 microns, the sides have a thickness of 500 microns.
- the thickness of the upper wall of the sealed envelope is within an approximate range from 250 to 500 microns. This range is due to the fact that below a thickness of approximately 250 microns, the upper wall becomes too deformable and therefore no longer performs its function of protection against depressurization by occupying little volume.
- the system 100 shown in FIG. 5 can thus be installed on an electronic card 200 as shown in FIG. 6.
- the fixing 201 of the system 100 on a card 200 must be carried out in such a way that the connection of the wires 114 does not hinder the device 120 in its shock and vibration protection action.
- the length of the wires 114 is greater than the distance between its two connection points.
- the fixing elements 201 must leave sufficient "flexibility" to the wires 114, that is to say that the wires 114 must not be stretched in the opening 113 and the first fixing point 201 on the card . This must be done to allow not only the device 120 complete freedom of movement, but also the device 110 its volume modification. It may be envisaged to install such a device for collecting in-flight data in high-tech equipment (airplane radar, etc.).
- the waterproof envelope 111 provides the particularity of ensuring the operation of a hard disk 112 in a depressurized environment by solutions based on flexible materials.
- the hard disks thus protected may in particular be consumer computer hard disks.
- the use of four hard disks protected 110 of this kind makes it possible today to obtain a memory capacity of the order of 300 GB in a volume of the order of 170x170x170 mm. Therefore, in comparison with existing devices, the invention makes it possible to have a higher memory capacity in a lower volume, this for a lower cost, while having good resistance to shocks, vibrations, depressurization and thermal variations.
- this type of protection system makes it possible to have an object, in particular electromechanical equipment, on board vectors in any constrained environment (airplanes, surface vessels, submarines, vehicles ).
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- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Casings For Electric Apparatus (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP02796901A EP1458625A1 (fr) | 2001-12-20 | 2002-12-10 | Enveloppe etanche pour la protection d'objet aux variations de depressurisation |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR01/16554 | 2001-12-20 | ||
FR0116554A FR2833933B1 (fr) | 2001-12-20 | 2001-12-20 | Enveloppe etanche pour la protection d'objet aux variations de depressurisation et systeme de protection d'objet dans des milieux contraints |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2003053805A1 true WO2003053805A1 (fr) | 2003-07-03 |
Family
ID=8870751
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2002/004271 WO2003053805A1 (fr) | 2001-12-20 | 2002-12-10 | Enveloppe etanche pour la protection d'objet aux variations de depressurisation |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1458625A1 (fr) |
FR (1) | FR2833933B1 (fr) |
WO (1) | WO2003053805A1 (fr) |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2695207A (en) * | 1951-08-28 | 1954-11-23 | Bendix Aviat Corp | Hermetically sealed package |
US2936940A (en) * | 1955-01-13 | 1960-05-17 | Berghgracht Marius | Fluid tight packages |
US5454157A (en) * | 1992-10-14 | 1995-10-03 | Maxtor Corporation | Method of manufacturing a hermetically sealed disk drive |
US5855272A (en) * | 1994-09-30 | 1999-01-05 | Symons; Richard Daniel | Storage of sensitive media |
US5988388A (en) * | 1995-11-27 | 1999-11-23 | Dassault Electronique | Device and method for the protection of objects against impacts or other mechanical effects |
US6304440B1 (en) * | 1999-11-04 | 2001-10-16 | Liken Lin | Shock-proof device of external hard disk driver box |
-
2001
- 2001-12-20 FR FR0116554A patent/FR2833933B1/fr not_active Expired - Lifetime
-
2002
- 2002-12-10 WO PCT/FR2002/004271 patent/WO2003053805A1/fr not_active Application Discontinuation
- 2002-12-10 EP EP02796901A patent/EP1458625A1/fr not_active Withdrawn
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2695207A (en) * | 1951-08-28 | 1954-11-23 | Bendix Aviat Corp | Hermetically sealed package |
US2936940A (en) * | 1955-01-13 | 1960-05-17 | Berghgracht Marius | Fluid tight packages |
US5454157A (en) * | 1992-10-14 | 1995-10-03 | Maxtor Corporation | Method of manufacturing a hermetically sealed disk drive |
US5855272A (en) * | 1994-09-30 | 1999-01-05 | Symons; Richard Daniel | Storage of sensitive media |
US5988388A (en) * | 1995-11-27 | 1999-11-23 | Dassault Electronique | Device and method for the protection of objects against impacts or other mechanical effects |
US6304440B1 (en) * | 1999-11-04 | 2001-10-16 | Liken Lin | Shock-proof device of external hard disk driver box |
Also Published As
Publication number | Publication date |
---|---|
EP1458625A1 (fr) | 2004-09-22 |
FR2833933B1 (fr) | 2004-06-25 |
FR2833933A1 (fr) | 2003-06-27 |
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