Cartridge for capturing co2

Abstract

The invention relates to a cartridge (25) for capturing CO2, the cartridge being configured to adsorb the CO2 from a user's breath, this cartridge comprising: a storage space (60) for an adsorbent product (P) capable of adsorbing CO2, this product being in the form of grains, in particular soda lime, the storage space (60) comprising a bottom (63) and an opening (61) opposite this bottom, a compression member (62) arranged on the side of the opening (61) in the storage space (60), which compression member is movable in the storage space (60) towards the bottom and configured to tamp down the adsorbent product in the form of grains against the bottom of the storage space (60), a spring (65) configured to exert a force on the compression member (62) tending to push the compression member (62) towards the bottom of the storage space (60).

Description

DESCRIPTION Title: CO2 capture cartridge [1] The present invention relates to a CO2 capture cartridge, in particular for equipping a protective hood. [2] Patent application EP2979561 discloses a hood comprising a flexible, waterproof cover intended to be put over a user's head, the flexible cover being provided with a transparent window and comprising, in its lower part, a rigid base element of generally annular shape intended to be placed around the user's neck. The base element comprises a tubular oxygen tank provided with a calibrated outlet opening into the internal volume of the flexible cover. This type of device is used on board aircraft when the cabin atmosphere is polluted (depressurization, smoke, chemical agent, etc.). This equipment must in particular allow the flight crew to combat the damage, rescue passengers and manage a possible evacuation of the aircraft. [3] The present invention aims in particular to improve a CO2 capture cartridge of such a hood. [4] The invention thus relates to a CO2 capture cartridge, configured to adsorb the CO2 resulting from the breathing of a user, this cartridge comprising: a storage space for an adsorbent product capable of adsorbing CO2, this product being in the form of grains, the storage space comprising a bottom and an opening opposite this bottom, a compression member arranged on the side of the opening of the storage space, and which is movable in the storage space towards the bottom and configured to pack the adsorbent product in the form of grains against the bottom of the storage space, a spring configured to exert a force on the compression member tending to push the compression member towards the bottom of the storage space. [5] According to one aspect of the invention, the storage space is defined between an outer side wall and an inner side wall. [6] According to one aspect of the invention, the inner and outer side walls are coaxial. [7] According to one aspect of the invention, the internal and external side walls are perforated. This allows in particular the ambient CO2 to pass through the external side wall, to meet the lime grains, to be adsorbed on the lime, and the air thus purified of CO2 then passes through the internal side wall to be "sucked" by a Venturi effect device at the outlet of an internal conduit of the CO2 capture cartridge, and returned to the internal volume of the hood. [8] The openings can have any type of suitable shape. [9] According to one aspect of the invention, the inner and outer side walls are cylindrical, with a circular or oval periphery or an oblong periphery.

[0010] According to one aspect of the invention, the internal and external side walls have substantially identical heights.

[0011] According to one aspect of the invention, the product in the form of grains is stored between the inner and outer side walls. In other words, the storage space has a generally annular shape.

[0012] According to one aspect of the invention, the outer sidewall is formed on a cylinder.

[0013] According to one aspect of the invention, the bottom wall of the storage space is formed on this cylinder.

[0014] According to one aspect of the invention, the internal side wall and the external side wall are made on two separate pieces which are assembled.

[0015] According to one aspect of the invention, the compression member has an annular shape with a central opening allowing the compression member to be engaged around the internal side wall.

[0016] Thus, the internal side wall can be used to guide the compression member when this compression member is moved in the storage space.

[0017] According to one aspect of the invention, the compression member is in the form of a washer inserted around the internal side wall.

[0018] According to one aspect of the invention, the washer is flat.

[0019] According to one aspect of the invention, the external side wall receives, at its end bordering the opening, a mounting skirt.

[0020] According to one aspect of the invention, the mounting skirt extends a predetermined height from the opening of the storage space.

[0021] According to one aspect of the invention, the compression member has an outer circumference which is adjusted to the shape of this mounting skirt.

[0022] According to one aspect of the invention, the cartridge further comprises a cover configured to close the opening of the storage space.

[0023] According to one aspect of the invention, the cover is configured to be fixed on the external side wall.

[0024] According to one aspect of the invention, the cover comprises an annular groove which is fixed to the external side wall and to the mounting skirt.

[0025] According to one aspect of the invention, the mounting skirt comprises a groove configured to receive a sealing gasket bearing on the external side wall.

[0026] According to one aspect of the invention, the compression member is made of plastic or metal.

[0027] According to one aspect of the invention, the spring is a multi-coil wave spring.

[0028] According to one aspect of the invention, the spring is made of metal.

[0029] According to one aspect of the invention, the spring comprises a plurality of undulating coils stacked on top of each other.

[0030] At the beginning of the cartridge's life (for example, for storage on board an aircraft for use when necessary), the product in the form of grains has not yet undergone any compaction, for example due to vibrations to which the cartridge is subjected. The volume initially occupied by the product is thus maximal and the compression member is located as close as possible to the opening of the storage space. During the product's life, vibrations can cause fragmentation of the grains of the adsorbent product, potentially causing the degradation of grains into fine particles. This has the effect of reducing the volume occupied by the adsorbent product in the storage space. The compression member, which is pushed by the spring, thus moves away from the opening and towards the bottom of the storage space.

[0031] It is thus possible to define a height H1 between the compression member and the cover, in an initial position (for example at the start of the cartridge's life) in which the compression member is as close as possible to the cover.

[0032] It is also possible to define a height H2 between the compression member and the cover after a storage period of the cartridge, a period during which the cartridge may have undergone vibrations which have caused a certain settling of the grains of the adsorbent product. This height H2 is greater than the height H1 reflecting the fact that the compression member is moving towards the bottom. This period is for example 10 years.

[0033] According to one aspect of the invention, the heights H1 and H2 are chosen so that the force of the spring is always greater than the weight of the adsorbent product subjected to the accelerations generated by the vibrations.

[0034] According to one aspect of the invention, the stiffness of the spring is chosen so that at the end of a predetermined storage period (for example on board an aircraft in service), the height H2 still allows the compression member to ensure satisfactory packing of the grains of the adsorbent product.

[0035] According to one aspect of the invention, the compression member and the spring are chosen so that the stroke of the compression member, throughout the storage period, is sufficient to maintain satisfactory packing of the grains.

[0036] In the case where a mounting skirt is inserted on the top of the external side wall, the height H2 can be chosen to be substantially equal to the height of this mounting skirt so that the compression member moves opposite this mounting skirt, and in the event of maximum settlement of the product during its lifetime, the compression member does not descend lower than this mounting skirt.

[0037] In an exemplary embodiment of the invention, the spring is simply placed on the compression member.

[0038] According to one aspect of the invention, the spring has coils which are placed around the internal side wall.

[0039] According to one aspect of the invention, the spring bears at one end on the cover and at the other end on the compression member.

[0040] According to one aspect of the invention, the spring is a separate part from the compression member, which are for example made from different materials.

[0041] Alternatively, the spring and the compression member are formed in one piece, i.e. in one piece.

[0042] According to one aspect of the invention, the wave spring with multiple metal coils is particularly well suited to a compact design and long-term storage of the cartridge, this storage life being able to be greater than 5 years, for example being set at 10 years.

[0043] In particular, the invention is more reliable with the use of a spring, especially a metal one, rather than a foam instead of the spring. This is because the foam can compress over time and lose its ability to apply sufficient force to the grains to compact the product.

[0044] According to one aspect of the invention, the product is retained in a filter envelope, in particular made of fabric.

[0045] According to one aspect of the invention, the fabric is pressed against the openings of the internal and external side walls.

[0046] According to one aspect of the invention, the product is soda lime.

[0047] The invention also relates to a protective hood comprising: a flexible envelope configured to be stored in a folded state and to be put on, in an unfolded state, through an open base of the flexible envelope, on the user's head, an articulated device secured to the open base and configured to be placed around the user's neck when the flexible envelope is put on the user's head, the articulated device comprising at least two rigid parts connected by a joint allowing these two rigid parts to pass from a folded position preventing the user's head from passing into the hood to an unfolded position allowing the user's head to pass into the hood, one of the rigid parts comprising the CO2 capture cartridge as described above.

[0048] Other characteristics, details and advantages of the invention will emerge more clearly on reading the description which follows on the one hand, and several examples of embodiment given for informational and non-limiting purposes with reference to the appended schematic drawings on the other hand, in which:

[0049] [Fig. 1] Figure 1 is a schematic representation of a hood according to an exemplary implementation of the invention, in the folded state;

[0050] [Fig. 2] Figure 2 is a schematic representation of the hood of Figure 1, in the unfolded state;

[0051] [Fig. 3] Figure 3 is a schematic representation of the hood of Figure 1, with the user moving the hinged device aside to put on the hood;

[0052] [Fig. 4] Figure 4 is an isolated schematic representation of the articulated hood device of Figure 1;

[0053] [Fig. 5] Figure 5 is a schematic representation of the hood of Figure 1, worn over the user's head;

[0054] [Fig. 6] Figure 6 is a schematic representation of a triggering member of the chronometer of the hood of Figure 1;

[0055] [Fig. 7] Figure 7 is a schematic representation of the hood of Figure 1, stored in a bag;

[0056] [Fig. 8] Figure 8 represents an alert sequence associated with the hood timer of Figure 1;

[0057] [Fig. 9] Figure 9 shows the CO2 capture cartridge for equipping the protective hood of Figure 1, with the spring in the initial position;

[0058] [Fig. 10] Figure 10 shows the CO2 capture cartridge of Figure 9, with the spring in the extended position.

[0059] The features, variants and different embodiments of the invention may be combined with each other in various combinations, provided that they are not incompatible or mutually exclusive. In particular, variants of the invention may be conceived comprising only a selection of features described below in isolation from the other features described, if this selection of features is sufficient to confer a technical advantage and / or to differentiate the invention from the prior art.

[0060] Figures 1 and 2 show a protective hood 1 comprising: a flexible envelope 2 configured to be stored in a folded state (state shown in Figure 1) and to be put on, in an unfolded state (state shown in Figure 2), through an open base 3 of the flexible envelope 2, on the head of the user U, an articulated device 5 (shown in isolation in Figure 4) secured to the open base 3 and configured to be placed around the neck of the user U when the flexible envelope 2 is put on the user's head.

[0061] In the example described, the flexible envelope 2, which is airtight, mainly contains a Nomex® fabric and a flexible collar 6, in particular made of Neoprene®, forming the base 3.

[0062] The hood 1 also includes a semi-rigid visor 7, in particular made of transparent polymer, and possibly a sound membrane (not shown).

[0063] The hood 1 also comprises a handle 10 secured to the flexible envelope 2, this handle 10 being placed on a top 11 of the flexible envelope 2, in a manner accessible to the user when the flexible envelope 2 is in the folded state, as can be seen in FIG. 1.

[0064] In the example described, the handle 10 is in the form of a flexible strip 12, of substantially rectangular shape.

[0065] Other strip shapes can be provided, for example a trapezoid shape or a shape with a rounding.

[0066] The band-shaped handle 10 is solid, i.e., it has no orifice. The handle 10 has no loop.

[0067] The strip-shaped handle 10 is fixed to the flexible envelope 2 by an edge of the strip, on an external face 14 of this flexible envelope 2. For example, the handle 10 is heat-sealed to the flexible envelope 2.

[0068] The handle 10 is made of self-extinguishing material, namely a material which can burn in a flame, but which extinguishes itself as soon as it is removed.

[0069] The handle 10 may or may not be made of the same material as the flexible casing. The handle 10 could, if desired, be made in one piece with the flexible casing 2, being for example an extension of the material of the flexible casing.

[0070] Advantageously, the handle 10 has a color distinct from the color of the flexible casing 2, here being fluorescent yellow.

[0071] Thus, the handle 10 is easily and very quickly identifiable by the user when he takes the folded hood 1 out of a bag. It may be necessary for the equipment to be put in place in less than 15 seconds.

[0072] As can be clearly seen in Figure 4, the articulated device 5 comprises two rigid parts 20 and 21 connected by an articulation 22 allowing these two rigid parts 20 and 21 to pass from a folded position (state shown in Figure 4) preventing the user's head from passing into the hood 1 to an unfolded position (state shown in Figure 5) allowing the user's head to pass into the hood 1.

[0073] The articulated device 5 has a mass of at least 50%, in particular at least 60% or 70%, of the total mass of the hood 1.

[0074] Thus the articulated device 5, quite heavy compared to the rest of the hood, allows reliable action to unfold the hood 1 by gravity.

[0075] The two parts 20 and 21 of the articulated device are formed by two tubular portions connected by the articulation 22 to form an open ring in the unfolded position.

[0076] The articulated device 5 is configured to provide an autonomous breathing function for the user having put on the hood 1. This is the case on hoods intended for real use, unlike hoods intended for training which can be simpler.

[0077] Thus the articulated device 5 comprises an oxygen reservoir 24 formed in the tubular part 21 and provided with an oxygen outlet opening into the internal volume of the flexible envelope 2.

[0078] The tubular part 20 comprises a cartridge 25 for capturing CO2, for example lime, configured to adsorb the CO2 from the user's breathing.

[0079] In the example described, the tubular portion 21 which comprises the oxygen reservoir 24 is curved, and the tubular portion 20 which comprises the CO2 capture cartridge 25 is straight.

[0080] In the case of a training hood, which does not need to have the functional equipment that must equip a protective hood for real use, it can be equipped with an articulated device without a respiratory function, still allowing users to train to deploy the hood.

[0081] The tubular part 20 of the articulated device 5 comprises, at its opposite end 29 to the articulation 22, a timer 30 configured to be triggered when the articulated device 5 passes from the folded position (figure 4) to the unfolded position (figure 5).

[0082] The chronometer 30 is equipped with a triggering member 31 configured to trigger the chronometer 30, this triggering member 31 being linked, on the one hand, to the chronometer 30 and, on the other hand, to the tubular part 21 of the articulated device 5 so that the spacing between the two parts 20 and 21 of the articulated device 5 acts on the triggering member 31 in order to trigger the chronometer 30.

[0083] The triggering member 31 is connected to the chronometer 30 in a removable manner so that the separation of the two parts 20 and 21 of the articulated device 5 from its folded position to its unfolded position causes an extraction of the triggering member 31 from the chronometer 30, extraction which results in a triggering of the chronometer which begins a countdown.

[0084] As can be clearly seen in Figures 4 and 6, the trigger member 31 comprises a trigger tab 33 configured to be inserted into a slot 34 of the chronometer 30.

[0085] The stopwatch 30 is configured to be in deactivated mode as long as the tab 33 is held in place.

[0086] For example, removing the tab 33 makes it possible to connect the stopwatch 30 to a power source, for example a battery.

[0087] Alternatively, the trigger tab 33 is made of electrically insulating material, and is configured to keep open an electrical power supply circuit of the chronometer 30.

[0088] The extraction of this trigger tab 33 causes the closure of the chronometer's power supply circuit, and the chronometer starts running.

[0089] The 30 stopwatch is part of a 35 electronic card.

[0090] For example, the stopwatch 30, or the electronic card 35 which defines the stopwatch, is mounted in a cover 36 of the CO2 capture cartridge 25.

[0091] Advantageously, the chronometer 30 is placed away from the oxygen capacity 24 (on the other rigid part of the articulated device) which may include metal parts likely to be at risk for electric arcs.

[0092] The trigger member 31 comprises at least one wire 37 connecting the removable trigger tab 33 and the opposite part 21 of the articulated device 5.

[0093] The wire 37 is configured so that, when the articulated device 5 is moved from its folded position to its unfolded position, this wire 37 is taut and pulls the removable tab 33 to extract it from the slot 34 of the stopwatch.

[0094] The removable trigger tab 33 includes a double loop 38 for the passage of the wire 37.

[0095] This double loop 38 allows for the most material to be placed in the extraction axis of the tab 33.

[0096] The double loop 38 made of a sufficiently flexible material of the tongue 33, each with a notch entry 39, makes it easy to place the wire 37 in the notch 40.

[0097] A notch 40 and a counter-notch 41 are provided to prevent the lace from becoming dislodged from the double loop 38.

[0098] The wire 37 has a sufficient length so that, when the hood 1 is in the folded state, this wire 37 is relaxed (as can be seen in FIG. 4). Thus, no tension is exerted on the trigger tab by the wire 37.

[0099] The removable trigger tab 33 comprises a non-return member 42 configured to oppose with a predetermined force the extraction of this tab 33 from the slot 34 of the chronometer.

[0100] The non-return member 42, in the form of an elastic tab, makes it possible, during assembly operations (for example folding and introduction into the bag and vacuuming), to eliminate the risk of applying a force to the tab 33 likely to trigger the timer 30 involuntarily. The non-return member 42 increases the force required to remove the tab 33 and thus prevents involuntary triggering.

[0101] The non-return member comprises a protrusion 43 housed in the slot 34.

[0102] In the example described, the removable trigger tab 33 is made from a plate, for example a plastic plate, in particular cut with a water jet.

[0103] The hood 1 is configured to provide the user with at least one item of information on the use of the hood based on data provided by the stopwatch 30, this item of use being an alert of the end of an oxygen reserve available in the articulated device 5 when the stopwatch has measured a predetermined duration, for example a duration of 15 minutes.

[0104] The hood 1 comprises a light indicator 45, formed by one or more LEDs, configured to provide the user with information on the use of the hood. This light indicator 45 is placed on the electronic card 35.

[0105] The indicator light 45 is controlled by the electronic card 35 to control the emission of light according to different modes.

[0106] For example, as illustrated in Figure 8, following the triggering of the timer 30 at time T0 and after a period PS of, for example, 14 minutes, the electronic card 35 is configured to flash the indicator light 45 for a first period P1 which lasts, for example, one minute. The expiration of the first period P1 corresponds to the reaching of time Ter where the regulatory time of use of the hood expires, which is, for example, 15 minutes. This regulatory time of use is determined by the manufacturer on the basis of the availability of oxygen in the reserve.

[0107] Then the indicator light 45 is kept lit constantly for a second period P2, for example 3 minutes, then the electronic card 35 is configured to turn off the indicator light 45 at the end of the second period P2. The user must be able to remove the hood before the end of this period P2.

[0108] The invention thus provides an effective alert to the user, so that he can manage the intervention time and remove the hood in time, when the oxygen reserve of the hood 1 is exhausted.

[0109] Other alert sequences can of course be considered, for example using another light sequence and / or a sound sequence.

[0110] The 30 timer is configured to start independently of the oxygen reserve being triggered.

[0111] We will now describe steps of a method for packaging a protective hood 1 as described above, in a bag 50, under vacuum, the packaging method comprising the following steps: folding the hood 1 so as to leave the handle 10 visible and accessible when the hood 1 is in the folded state. placing the hood 1 thus folded in the bag 50, closing the bag 50.

[0112] When folding, the visor 7 is placed on the folded flexible envelope 2 (see figure 1) so that folds of the flexible envelope are located behind the visor 7.

[0113] Preferably, the visor 7 is positioned as flat as possible or keeping its initial curvature against the articulated device to avoid the phenomenon of cracks appearing in the material when it remains constrained by folding for a long storage period which may be between 10 years and 15 years.

[0114] We will now describe steps of a method for deploying a hood 1 as described above, initially stored under vacuum in the folded state in a bag 50, the method comprising the following step: opening the bag 50 by the user II to be able to remove the hood 1 in the folded state (see figure 7), lifting the hood 1 initially in the folded state, using the handle 10 held by the user, to the high position, so that the flexible envelope 2 can unfold by the action of the weight of the base of the flexible envelope 2 and the articulated device 5, to pass from the folded state to the unfolded state (see figure 2), when the flexible envelope 2 is in the unfolded state, turning the hood 1 over and moving the two rigid parts 20 and 21 apart from each other to move the articulated device 5 into the unfolded position, so that the user can put on the hood 1. hood 1.

[0115] Thanks to the invention, it is thus possible to deploy the hood 1 simply by holding it vertically using the handle 10, without having to shake the hood suddenly.

[0116] The timer 30 is triggered when the articulated device 5 moves from the folded position to the unfolded position, during deployment.

[0117] We will now describe in more detail, with reference to figures 9 and 10, the CO2 capture cartridge 25 according to an exemplary embodiment of the invention.

[0118] This cartridge 25 is integrated into the rigid part 20 connected to the joint 22 described above.

[0119] The CO2 capture cartridge 25 comprises a storage space 60 for an adsorbent product P capable of adsorbing CO2, this product P being soda lime in the form of grains.

[0120] The product P is retained in a filtering envelope 80, in particular made of fabric, placed in the storage space 60.

[0121] The storage space 60 comprises a bottom 63 and an opening 61 opposite this bottom 63.

[0122] The CO2 capture cartridge 25 further comprises a compression member 62 arranged on the side of the opening 61 of the storage space 60, and which is movable in the storage space 60 towards the bottom 63 and configured to pack the adsorbent product P in the form of grains against the bottom 63 of the storage space 60.

[0123] The CO2 capture cartridge 25 further comprises a spring 65 configured to exert a force on the compression member 62 tending to push the compression member 62 towards the bottom 63 of the storage space 60.

[0124] The storage space 60 is defined between an outer side wall 67 and an inner side wall 68, which are coaxial.

[0125] The inner 68 and outer 67 side walls are perforated with openings 69 (visible in Figures 9 and 10 for the inner wall 68). This allows in particular the ambient CO2 to pass through the outer side wall 67, to meet the lime grains P, to be adsorbed on the lime, and the air thus purified of CO2 then passes through the inner side wall 68 to be "sucked" by a Venturi effect device at the outlet of an internal conduit of the CO2 capture cartridge 25, and returned to the internal volume of the hood 1.

[0126] The inner 68 and outer 69 side walls are cylindrical, with a circular or oval circumference or an oblong circumference, and have substantially identical heights.

[0127] The product P in the form of grains is stored between the internal 68 and external 69 side walls. In other words, the storage space 60 has a generally annular shape.

[0128] The outer side wall 67 is formed on a cylinder.

[0129] The internal side wall 68 and the external side wall 67 are made on two separate pieces which are assembled.

[0130] The compression member 62 is a planar annular-shaped washer with a central opening 70 for engaging the compression member 62 around the inner side wall 68.

[0131] Thus, the internal side wall 68 can be used to guide the compression member 62 during a movement of this compression member 62 in the storage space 60.

[0132] The compression member 62 is in the form of a washer inserted around the internal side wall 68.

[0133] The external side wall 67 receives, at its end bordering the opening 61, a mounting skirt 72.

[0134] The mounting skirt 72 extends a predetermined height from the opening 61 of the storage space 60.

[0135] The compression member 62 has an outer circumference which is adjusted to the shape of this mounting skirt 72.

[0136] The cartridge 25 further comprises a cover 73 configured to close the opening 61 of the storage space 60.

[0137] The cover 73 is configured to be secured to the outer side wall 67, and has an annular groove 74 for securing to the outer side wall 67 and the mounting skirt 72.

[0138] The mounting skirt 72 includes a groove 75 configured to receive a seal bearing against the external side wall 67.

[0139] The compression member 62 is made of plastic or metal.

[0140] The spring 65 is a multi-coil wave spring made of metal. The spring 65 has a plurality of wave coils 77 stacked on top of each other.

[0141] At the beginning of the life of the cartridge 25 (for example for storage on board an aircraft for use when necessary), the product P in the form of grains has not yet undergone any compaction due, for example, to vibrations to which the cartridge is subjected. The volume initially occupied by the product is thus maximum and the compression member 62 is located as close as possible to the opening 61 of the storage space 60. During the life of the product, vibrations can cause fragmentation of the grains of the adsorbent product, potentially causing the degradation of grains into fine particles. This has the effect of reducing the volume occupied by the adsorbent product in the storage space 60. The compression member 62 which is pushed by the spring 65, moves, in translation, thus away from the opening 61 and towards the bottom 63 of the storage space 60.

[0142] It is thus possible to define a height H1 between the compression member 62 and the cover 73, in an initial position illustrated in figure 9 (for example at the start of the cartridge's life) in which the compression member 62 is located as close as possible to the cover 73.

[0143] As can be seen in Figure 10, it is also possible to define a height H2 between the compression member 62 and the cover 73 after a storage period of the cartridge, a period during which the cartridge may have undergone vibrations having caused a certain settling of the grains of the adsorbent product. This height H2 is greater than the height H1 reflecting the fact that the compression member 62 moves in translation towards the bottom 63. This period is for example 10 years.

[0144] It can be seen in Figure 10 that the coils 77 of the spring 65 have moved further away from each other, lengthening the spring 65 which takes the height H2. In passing from the position of Figure 9 to that of Figure 10, the spring 6 has lengthened from the height H1 to the height H2. The spring 65 thus passes from an initial compressed position to an elongated position.

[0145] The heights H1 and H2 are chosen so that the force of the spring 65 is always greater than the weight of the adsorbent product subjected to the accelerations generated by the vibrations. In particular, the stiffness of the spring 65 is chosen so that at the end of a predetermined storage period (for example on board an aircraft in service), the height H2 still allows the compression member 62 to ensure satisfactory compaction of the grains of the adsorbent product P.

[0146] The compression member 62 and the spring 65 are chosen so that the stroke of the compression member 62, throughout the storage period, is sufficient to maintain satisfactory packing of the grains.

[0147] In the case where a mounting skirt 72 is inserted on the top of the external side wall 67, the height H2 can be chosen to be substantially equal to the height of this mounting skirt 72 so that the compression member 62 moves opposite this mounting skirt 72, and in the event of maximum compaction of the product during its lifetime, the compression member 62 does not descend lower than this mounting skirt 72.

[0148] In the example described, the spring 65 is simply placed on the compression member 62.

[0149] The spring 65 has coils which are placed around the internal side wall 68.

[0150] The spring 65 rests at one end on the cover 73 and at the other end on the compression member 62.

[0151] The spring 65 is a separate part from the compression member 62, which are for example made from different materials.

[0152] Alternatively, the spring 65 and the compression member 62 are formed in one piece, i.e. in a single piece.

[0153] The wave spring 65 with the multiple metal coils 77 is particularly well suited to a compact design and long-term storage of the cartridge 25, this storage life being able to be greater than 5 years, for example being set at 10 years.

[0154] In particular, the invention is more reliable with the use of a spring 65, in particular made of metal, rather than a foam in place of the spring 65. Indeed, the foam can compress over time and lose its ability to apply sufficient force to the grains to compact the product.

[0155] In a variant of the invention, the rigid part 20 which comprises the cartridge 25 may be devoid of the chronometer 30 and triggering member described above.

Claims

CLAIMS

1. CO2 capture cartridge (25), configured to adsorb CO2 from the breathing of a user, this cartridge comprising: a storage space (60) for an adsorbent product (P) capable of adsorbing CO2, this product being in the form of grains, in particular soda lime, the storage space (60) comprising a bottom (63) and an opening (61) opposite this bottom, a compression member (62) arranged on the side of the opening (61) of the storage space (60), and which is movable in the storage space (60) towards the bottom and configured to pack the adsorbent product in the form of grains against the bottom of the storage space (60), a spring (65) configured to exert a force on the compression member (62) tending to push the compression member (62) towards the bottom of the storage space (60).

2. Cartridge (25) according to the preceding claim, in which the storage space (60) is defined between an external side wall (67) and an internal side wall (68), these internal and external side walls being in particular perforated.

3. Cartridge (25) according to the preceding claim, in which the compression member (62) has an annular shape with a central opening allowing the compression member (62) to be engaged around the internal side wall (68), the compression member (62) being in particular in the form of a washer inserted around the internal side wall.

4. Cartridge (25) according to one of the preceding claims, in which the cartridge (25) further comprises a cover (73) configured to close the opening of the storage space (60), and the spring (65) is in particular configured to come to bear at one end on the cover and at the other end on the compression member (62).

5. Cartridge (25) according to one of the preceding claims, in which the compression member (62) is made of plastic or metal.

6. Cartridge (25) according to one of the preceding claims, in which the spring (65) is a multi-turn wave spring, in particular made of metal.

7. Cartridge (25) according to one of the preceding claims, in which the compression member (62) and the spring (65) are chosen so that the stroke of the compression member (62), throughout the storage period, is sufficient to maintain satisfactory compaction of the product.

8. Cartridge (25) according to one of the preceding claims, in which the spring (65) is a separate part from the compression member (62), which are for example made of different materials.

9. Cartridge (25) according to one of the preceding claims, in which the product is retained in a filtering envelope (80), in particular made of fabric.

10. Protective hood (1) comprising: a flexible envelope (2) configured to be stored in a folded state and to be put on, in an unfolded state, through an open base of the flexible envelope, on the user's head, an articulated device (5) secured to the open base and configured to be placed around the user's neck when the flexible envelope is put on the user's head, the articulated device comprising at least two rigid parts (20, 21) connected by an articulation allowing these two rigid parts to pass from a folded position preventing the user's head from passing into the hood to an unfolded position allowing the user's head to pass into the hood, one of the rigid parts comprising the CO2 capture cartridge (25) according to one of the preceding claims.

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