WO2022023655A1 - Dispositif a chambre interieure etanche - Google Patents
Dispositif a chambre interieure etanche Download PDFInfo
- Publication number
- WO2022023655A1 WO2022023655A1 PCT/FR2021/051382 FR2021051382W WO2022023655A1 WO 2022023655 A1 WO2022023655 A1 WO 2022023655A1 FR 2021051382 W FR2021051382 W FR 2021051382W WO 2022023655 A1 WO2022023655 A1 WO 2022023655A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- gas
- closed loop
- loop portions
- inner chamber
- seal
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H39/00—Switching devices actuated by an explosion produced within the device and initiated by an electric current
- H01H39/006—Opening by severing a conductor
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
- H01H1/64—Protective enclosures, baffle plates, or screens for contacts
- H01H1/66—Contacts sealed in an evacuated or gas-filled envelope, e.g. magnetic dry-reed contacts
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/02—Bases, casings, or covers
- H01H9/04—Dustproof, splashproof, drip-proof, waterproof, or flameproof casings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/02—Bases, casings, or covers
- H01H9/04—Dustproof, splashproof, drip-proof, waterproof, or flameproof casings
- H01H9/042—Explosion-proof cases
Definitions
- the present invention relates to a device with a sealed inner chamber of simple design.
- a non-limiting application of the invention relates to the field of electrical switching devices in which a plasma is generated following the appearance of an electric arc when the circuit is opened.
- Pyrotechnic cut-off devices comprising a body in which is present a pyrotechnic initiator configured to, when triggered, set in motion a piston provided with a relief in the direction of a conductive bar to be cut.
- the breakage of the conductive bar through which an electric current passes can cause the generation of a plasma in the internal chamber of the device. It is desired to minimize the risk of the plasma escaping outside the cut-off device. It is desirable to have a solution making it possible to ensure, in a simple manner, good sealing of an interior chamber of a device.
- the invention proposes a device comprising:
- the seal comprising at least two closed-loop portions which surround the through-element and provide a seal along the latter, and at least two portions link connecting the closed loop portions present between the first part and the second part and providing a seal between them.
- the closed loop portions are diametrically opposed.
- the closed loop portions have a generally rectangular shape
- the crossing element has a generally rectangular section at least at the level of the closed loop portions.
- the section of the crossing element has rounded corners.
- the seal is made of a flexible material and the closed loop portions are oriented transversely to a plane containing the connecting portions by pivoting around them.
- the device is an electrical cut-off device, the traversing element being a conductive element, the device comprising a piston movable in the interior chamber capable of breaking the traversing element following its setting in motion.
- the seal makes it possible to avoid any risk of escape of the plasma generated in the inner chamber when the crossing element breaks by impact with the piston during the cut.
- the device may be a pyrotechnic cut-off device which comprises a pyrotechnic initiator, the piston being able to move following the actuation of the pyrotechnic initiator.
- the body may be provided with a gas discharge orifice in communication with the interior chamber and capable of evacuating its contents, and with a gas introduction orifice in communication with the interior chamber and capable of allow the introduction of a gas into the inner chamber, the gas introduction orifice and the gas discharge orifice being identical or distinct.
- the inner chamber can be filled with a dielectric gas whose breakdown voltage is greater than the breakdown voltage of air at a reference pressure taken at 1 bar.
- the pyrotechnic breaking device has better electric arc breaking performance than a device filled with air, without increasing the mass or the size of the device.
- the composition of the dielectric gas can at least comprise 2,3,3,3-tetrafluoro-2-(trifluoromethyl)propanenitrile (CF 3 ) 2 CFCN.
- the dielectric gas may further comprise at least one gas from dry air, nitrogen and carbon dioxide.
- the molar content of 2,3,3,3-tetrafluoro-2-(trifluoromethyl)propanenitrile (CF 3 ) 2 CFCN in the dielectric gas can be between 10% and 60%.
- the gas discharge orifice is in particular able to evacuate the air contained in the interior chamber.
- the gas introduction orifice is in particular capable of introducing the dielectric gas into the interior chamber.
- the dielectric gas is capable of pressurizing the interior chamber to a pressure of at least 1 bar at a temperature of -40°C.
- the invention also relates to a secure electrical installation comprising a cut-off device as described above and an electrical circuit connected to the through-element.
- the invention also relates to a vehicle comprising an electrical installation as described above.
- the crossing element can alternatively be an element carrying one or more sensors making it possible to measure a physical or chemical quantity of a gas flowing through the inner chamber for which it is desired to avoid any risk of escape to the exterior of the device.
- the sensor(s) can for example be pressure and/or temperature sensors.
- Figure 1 is a schematic representation of an example of a device according to the invention.
- Figure 2 is an exploded view of the device of Figure 1.
- Figure 3 is a view of a detail of the device of Figure 1.
- Figure 4 corresponds to a sectional view of the device of Figure 1 in a first configuration allowing the passage of current.
- Figure 5 corresponds to a sectional view of the device of Figure 1 in a second current cut-off configuration.
- Figure 6 is a schematic representation of an example of a seal before insertion of the through-element through the closed-loop portions.
- Figure 7 is a schematic representation of a secure electrical installation comprising the device of Figure 1.
- FIG. 8 is a detail of a variant of a closed-loop portion that can be used in the context of the invention.
- Figures 1, 2, 4 and 5 illustrate a cut-off device 100 according to one embodiment of the invention which comprises a body 10 inside which are installed a pyrotechnic initiator 20, a piston 30, and a traversing element 40
- the body 10 has a shape extending along a main axis Z.
- the body 10 can have a generally cylindrical shape, as in the example illustrated.
- the 10 is formed by assembling a first part 11 with a second part 12.
- the first 11 and second 12 parts can be superimposed.
- the crossing element 40 is here an electrically conductive element, for example in the form of a bar or a conductive tab . It extends through the device 100 and is located between the first part 11 and the second part 12.
- the traversing element 40 passes through the body 10 and is present both inside the body 10 and outside .
- the crossing element 40 is present at an assembly zone between the first 11 and second 12 parts.
- the crossing element 40 has two terminals 41 and 42 intended to be connected to an electrical circuit (not shown). Terminals 41 and 42 form the terminals of the device 100 and here correspond to the two ends of the crossing element 40.
- the piston 30 is mounted so as to be movable between a first current passage position (high position in the example illustrated, see FIG. 4) and a second current cut-off position (low position in the example illustrated, see FIG. 5).
- the first part 11 defines a storage cavity IIa in which the piston 30 is located when it is in its first position.
- the second part 12 defines a receiving cavity 12a which communicates with the storage cavity 11a.
- the reception cavity 12a can be aligned with the storage cavity 11a along the main axis Z.
- the reception cavity 12a is intended to receive the piston 30 when it is in its second position, corresponding to the configuration of the FIG. 5.
- the reunion of the storage cavity 11a and the reception cavity 12a forms an interior chamber 13 in which the piston 30 is intended to move.
- the piston 30 can extend along the Z axis.
- the piston 30 can have a shape of revolution around the Z axis.
- the Z axis can correspond to the axis of movement of the piston 30.
- the piston 30 comprises a circumferential groove in which a seal 31, for example an O-ring, is housed.
- the piston 30 can move in a direction of movement A along the axis Z inside the body 10 between the first and the second position. As long as the pyrotechnic initiator 20 has not been triggered, the piston 30 is in its first position.
- Through member 40 passes through inner chamber 13. In the example shown, through member 40 extends along a diameter of inner chamber 40.
- the piston 30 is moved from its first position to its second position.
- the function of the piston 30 is to break the traversing element 40 during its passage from its first position to its second position, thus cutting off the flow of electric current through the traversing element 40.
- the pyrotechnic initiator 20 comprises a charge pyrotechnic connected to connectors 21.
- the pyrotechnic charge is, when it is initiated for example using a current passing through the connectors 21, able to generate a pressurization gas by its combustion.
- the illustrated variant shows a pyrotechnically actuated cut-off device 100 but one does not exit from the scope of the invention if the piston is moved otherwise, for example following the release of a return element or of a gas stored under pressure.
- the crossing element 40 may optionally comprise one or more zones of weakness 43 intended to form a breaking point of the crossing element 40.
- the illustrated crossing element 40 comprises two areas of weakness 43, making it possible to ensure a break in the crossing element 40 at two breaking points and to detach a broken portion 44 from the rest of the crossing element 40.
- the traversing element has only a single zone of weakness and is broken at a single breaking point, the broken portion being bent by the piston in the receiving cavity when the piston is in the second position.
- the rupture of the crossing element 40 by impact with the piston 30 can lead to the generation of a gaseous plasma in the inner chamber 13 for which it is desired to avoid leakage through the body 10.
- the device is provided with a seal 50.
- Seal 50 surrounds inner chamber 13 around its entire circumference, thus surrounding the area in which the plasma is generated.
- the gasket 50 is located between the first part 11 and the second part 12, in the assembly zone between them.
- the first part 11 and the second part 12 can each comprise a groove which is intended to receive the gasket 50.
- the grooves have a shape complementary to the gasket 50.
- the gasket 50 defines a closed shape, here generally circular, it being understood that other shapes are possible depending on the shape of the body 10, such as a polygonal or elliptical shape.
- the inner chamber 13 is located inside the closed shape defined by the seal 50.
- the crossing element 40, and in particular its weak zone(s) 43, is located inside the closed shape defined by the seal 50.
- the seal 50 comprises in the illustrated example two closed loop portions 53 and two connecting portions 51 which connect the closed loop portions 53.
- Each of the connecting portions 51 is located between the closed loop portions 53.
- connecting portions 51 can be formed by one strand and the closed loop portions 53 by two strands.
- the ends of the connecting portions 51 are connected to the closed loops 53.
- the strand forming the portions link 51 can be split at the ends of the link portions 51 to form the closed loop portions 53.
- the link portions 51 can be single stranded and the closed loop portions 53 double stranded.
- the strands forming the connecting portions 51 and/or the closed loop portions 53 can have a circular, elliptical or polygonal cross section, for example square or non-square rectangular.
- the strands forming the connecting portions 51 and the closed loop portions 53 may be of identical shape and/or of identical greatest transverse dimension, for example of identical diameter. Such a feature participates in further improving sealing.
- the crossing element 40 is introduced inside the closed loop portions 53 and extends between the connecting portions 51.
- the crossing element 40 is housed inside the closed loop portions 53.
- the crossing element 40 and the connecting portions 51 can be located in the same plane.
- the closed loop portions 53 can be transverse to the plane containing the connecting portions 51, for example perpendicular to this plane.
- the closed-loop portions 53 enclose the through-element 40.
- the closed-loop portions 53 may be transverse, for example perpendicular, to the longitudinal axis X of the through-element 40.
- the closed-loop portions 53 locally surround the through element 40 over its entire circumference around its longitudinal axis X.
- the closed loop portions 53 are in contact with the through element 40.
- the shape of the closed loop portions 53 may be identical to the shape of the section of the through element 40 at the level thereof.
- the section of the crossing element is, unless otherwise stated, taken transversely, for example perpendicularly, to its longitudinal axis X.
- the closed loop portions 53 are located between the first part 11 and the second part 12.
- the closed loop portions 53 provide sealing at the portion of the crossing element 40 located on the assembly area of the first 11 and second 12 parts.
- the closed loop portions 53 seal along the longitudinal axis X of the through element 40.
- the closed loop portions 53 have a generally rectangular shape with rounded internal corners C1.
- the crossing element 40 has no sharp edge at the areas on which it is surrounded by the closed loop portions 53.
- the edges, or corners C2, of the crossing element 40 can be rounded at the level of these zones, for example by machining.
- the presence of rounded corners C1 and C2 improves sealing.
- other shapes are possible for the closed loop portions depending on the shape of the section of the crossing element such as a generally square, circular or elliptical shape.
- the closed loop portions 53 can define openings of the same surface. This allows a simpler manufacture of the joint 50.
- the section of the through element 40 at the level of each of the closed loop portions 53 can be identical.
- the connecting portions 51 provide, for their part, sealing on the assembly zone between the first 11 and second 12 parts in a direction transverse to the longitudinal axis X of the crossing element 40.
- the seal 50 constitutes a one and the same element making it possible to ensure continuity of the seal around the inner chamber 13.
- FIG. 6 illustrates the seal 50 at rest, that is to say before placing the crossing element 40 through the closed loop portions 53.
- the seal 50 has a flat shape when he is at rest.
- the connecting portions 51 and the closed loop portions 53 are located in the same plane.
- the strands 52 forming the closed loop portions 53 are located in the same plane as the strands forming the connecting portions 51 when the joint 50 is at rest.
- the closed loop portions 53 are straightened in order to install the through element 40 in the loops 53 thanks to the flexibility of the joint 50.
- the joint is formed of a flexible material allowing this straightening. closed loop portions 53.
- the seal can in particular be made of one of the following materials: silicone, nitrile rubber (NBR), hydrogenated nitrile rubber (HNBR), ethylene-propylene-diene monomer (EPDM), fluoroelastomer (FKM).
- NBR nitrile rubber
- HNBR hydrogenated nitrile rubber
- EPDM ethylene-propylene-diene monomer
- FKM fluoroelastomer
- the flexible seal variant is particularly easy to manufacture. However, it does not depart from the scope of the invention if the seal is obtained directly with closed loop portions transverse to the connecting portions.
- the air located inside the chamber 13 after the assembly of the cut-off device 100 can be evacuated through a gas evacuation orifice.
- a dielectric gas can then be introduced into the inner chamber 13 of the switching device 100 through a gas introduction orifice.
- the evacuation and gas introduction orifices may be identical or distinct.
- the dielectric gas has a breakdown voltage greater than that of air at a reference pressure taken at 1 bar.
- the breaking device 100 has a greater breaking capacity than a device whose interior chamber is filled with air, and the electric arc generated inside the chamber 13 is extinguished more quickly and over a shorter distance. . Consequently, a better breaking capacity is obtained without modifying the size or the mass of the breaking device.
- the dielectric gas is introduced into the cut-off device 100 at room temperature, for example at a temperature of 20°C.
- the dielectric gas may be capable of pressurizing the inner chamber 13 to a pressure of at least 1 bar at a temperature of -40°C.
- the pressure of the dielectric gas in the inner chamber 13 can be greater than 1 bar, even in the case of cold temperatures between 0°C and -40°C.
- the use of the seal 50 described above is particularly advantageous in order to maintain the dielectric gas in the inner chamber 13 and prevent it from leaking outside of the body 10.
- the dielectric gas can be a mixture comprising gas (CF 3 ) 2 CFCN (2, 3,3,3-tetrafluoro-2-(trifluoromethyl)propanenitrile, marketed under the name 3MTM NovecTM 4710, and at least one other gas among dry air, dinitrogen (N 2 ) and carbon dioxide (C0 2 ).
- the molar content of NovecTM 4710 in the dielectric gas can be between 10% and 60%.Preferably, the molar content of NovecTM 4710 in the dielectric gas is between 15% and 25%.
- a humidity-absorbing product can be placed inside the chamber 13 so as to prevent the hydrolysis of the dielectric gas, for example in the form of a metal sulphate or of a molecular sieve whose size of the pores is less than or equal to 5 ⁇ .
- the secure electrical installation 300 comprises a secure power supply system 310 comprising the cut-off device 100 (represented very schematically) and a power supply circuit 311.
- the power supply circuit 311 here comprises an electric generator G connected to the second terminal 42 of the crossing element 40 of the cut-off device 100.
- the electric generator G can be for example a battery or an alternator.
- the secure power system 310 further comprises a control element C configured to actuate the pyrotechnic initiator 20 when an anomaly is detected. Control element C is connected to pyrotechnic initiator 20 through connectors 21.
- the anomaly in response to which control element C can trigger pyrotechnic initiator 20 may be an electrical anomaly, such as a current threshold exceeded in the circuit, or a non-electrical anomaly such as the detection of a shock, for example a sudden deceleration of the control element, a change in temperature, pressure, etc.
- the control element C is able to send an electric current to the pyrotechnic initiator 20 for its triggering in order to cut off the current, as described previously.
- the secure electrical installation 300 finally comprises an electrical device D connected here to the first terminal 41 of the through-element 40 of the cut-off device 100 to be powered by the secure power supply system 310.
- a vehicle automobile may include a secure electrical installation 300.
- the strands of the closed loop portions 53 have an identical length.
- the center of the loops 53 is located in the extension of the strands of the connecting portions 51.
- the strands of the closed loop portions 153 may have a different length, with one strand having a longer length than the other.
- the center C of the closed loop portions 153 is offset with respect to the extension of the strands of the connecting portions 151.
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Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP21756014.3A EP4189715A1 (fr) | 2020-07-28 | 2021-07-23 | Dispositif a chambre interieure etanche |
US18/006,827 US20230274899A1 (en) | 2020-07-28 | 2021-07-23 | Device with sealed inner chamber |
CN202180059450.6A CN116157888A (zh) | 2020-07-28 | 2021-07-23 | 具有密封内腔室的装置 |
JP2023506061A JP2023535965A (ja) | 2020-07-28 | 2021-07-23 | 密封された内部室を備えた装置 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR2007969A FR3113181A1 (fr) | 2020-07-28 | 2020-07-28 | Dispositif à chambre intérieure étanche |
FRFR2007969 | 2020-07-28 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2022023655A1 true WO2022023655A1 (fr) | 2022-02-03 |
Family
ID=74183201
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2021/051382 WO2022023655A1 (fr) | 2020-07-28 | 2021-07-23 | Dispositif a chambre interieure etanche |
Country Status (6)
Country | Link |
---|---|
US (1) | US20230274899A1 (fr) |
EP (1) | EP4189715A1 (fr) |
JP (1) | JP2023535965A (fr) |
CN (1) | CN116157888A (fr) |
FR (1) | FR3113181A1 (fr) |
WO (1) | WO2022023655A1 (fr) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4638275A (en) * | 1984-03-28 | 1987-01-20 | La Telemecanique Electrique | Electric switching unit comprising a gas-tight casing for protection of contacts |
US6007377A (en) * | 1997-02-20 | 1999-12-28 | Pdl Holdings Limited | In Line rewirable switch device |
EP3618090A2 (fr) * | 2018-09-02 | 2020-03-04 | Hirtenberger Automotive Safety GmbH & Co KG | Sectionneur de courant pyrotechnique |
-
2020
- 2020-07-28 FR FR2007969A patent/FR3113181A1/fr active Pending
-
2021
- 2021-07-23 CN CN202180059450.6A patent/CN116157888A/zh active Pending
- 2021-07-23 EP EP21756014.3A patent/EP4189715A1/fr active Pending
- 2021-07-23 JP JP2023506061A patent/JP2023535965A/ja active Pending
- 2021-07-23 WO PCT/FR2021/051382 patent/WO2022023655A1/fr active Application Filing
- 2021-07-23 US US18/006,827 patent/US20230274899A1/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4638275A (en) * | 1984-03-28 | 1987-01-20 | La Telemecanique Electrique | Electric switching unit comprising a gas-tight casing for protection of contacts |
US6007377A (en) * | 1997-02-20 | 1999-12-28 | Pdl Holdings Limited | In Line rewirable switch device |
EP3618090A2 (fr) * | 2018-09-02 | 2020-03-04 | Hirtenberger Automotive Safety GmbH & Co KG | Sectionneur de courant pyrotechnique |
Also Published As
Publication number | Publication date |
---|---|
US20230274899A1 (en) | 2023-08-31 |
CN116157888A (zh) | 2023-05-23 |
FR3113181A1 (fr) | 2022-02-04 |
EP4189715A1 (fr) | 2023-06-07 |
JP2023535965A (ja) | 2023-08-22 |
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