Breathing bag for a closed-circuit breathing apparatus and closed-circuit breathing apparatus

Abstract

Breathing bag (1) for a closed-circuit breathing apparatus (100), comprising a bag element (2) that surrounds an inner volume (3), wherein the bag element (2) reversibly has at least one deployment state (4) and a can assume a folded state (5), and furthermore, the bag element (2) in its unfolded state (4) surrounds a larger internal volume (3) than in its folded state (5), wherein the bag element (2) has a one-piece bag section (10) and a one-piece tub section (20), wherein the bag section (10) has a higher flexibility than the tub section (20), and wherein the bag section (10) at least partially immerses itself in the tub section (20) at least in the folded state (5). characterized by the fact that the bag section (10) and the tub section (20) are manufactured as multi-component injection molding and have different materials from each other, that the bag section (10) has an arrangement section (11), that the tub section (20) has a counter-arrangement section (21), and that the bag section (10) and the tub section (20) are materially bonded to each other at the arrangement section (11) and at the counter-arrangement section (21).

Description

[0001] The present invention relates to a breathing bag for a closed-circuit breathing apparatus, comprising a bag element that surrounds an internal volume, wherein the bag element can reversibly assume at least one unfolded state and one folded state, and wherein the bag element furthermore surrounds a larger internal volume in its unfolded state than in its folded state. Furthermore, the invention relates to a closed-circuit breathing apparatus, comprising at least one counterlung, a filter device, an oxygen source, and a housing, wherein the counterlung, the filter device, and the oxygen source are arranged in the housing. STATE OF THE ART

[0002] Closed-circuit breathing apparatus are well-known and are often used under the most challenging conditions, particularly to provide a self-contained breathing air supply for the user. Closed-circuit breathing apparatus are used, for example, in firefighting as part of fire department equipment, but also in mine and / or mine rescue. Common closed-circuit breathing apparatuses have a counterlung with a breathing bag as their central component.

[0003] Other components of closed-circuit breathing apparatus may include, for example, filter units, in particular CO2 filters, as well as air conditioning devices and an oxygen source.

[0004] The breathing bag of a closed-circuit breathing apparatus is typically used as a collection volume or active gas reservoir for the exhaled air, purified of carbon dioxide, of a closed-circuit breathing apparatus user. In particular, an unfolding or inflating process can absorb a certain amount of gas, while folding or collapsing the breathing bag can release a certain amount of gas. For the proper functioning of a breathing bag, and thus of the entire closed-circuit breathing apparatus, the tightness of the breathing bag is crucial.

[0005] State-of-the-art breathing bags are usually complex constructions for which individual elements are made from a suitable material according to a pattern and then joined together in a welding process.

[0006] These complex, multi-step processes for manufacturing a breathing bag according to the state of the art are particularly time-consuming and labor-intensive, and furthermore, they cannot be automated. This results in high costs for the production of conventional breathing bags. Furthermore, assembling the conventional breathing bags from a pattern requires careful testing of the tightness of each individual seam, making quality testing and assurance of a finished breathing bag lengthy and complex.

[0007] DE 10 2014 017 954 A1 describes a breathing vessel for a closed-circuit breathing apparatus. The breathing vessel comprises a dimensionally stable vessel body and a vessel arranged within the vessel body with an opening. An inlet opening is arranged in the vessel body through which breathing air enters the vessel. An outlet opening is arranged in the vessel body for returning breathing air to the circuit of the closed-circuit breathing apparatus. The breathing vessel has a gas-tight membrane that hermetically seals the opening of the vessel. During inhalation, breathing air flows out of the vessel through the outlet opening, and during exhalation, breathing air freed from CO2 flows out of the inlet opening into the vessel.

[0008] DE 37 42 639 A1 discloses a closed-circuit breathing apparatus. The apparatus is mounted on a frame and a housing and can be connected to a face mask. The apparatus comprises exhalation and inhalation passages, a breathing gas source delivered into the breathing apparatus at a constant flow rate, a carbon dioxide absorber, and a pump driven by the breathing gas source. The apparatus further comprises an inhalation gas reservoir on the downstream side of the carbon dioxide absorber, which is connected to the inhalation passage. An exhalation gas reservoir is located on the upstream side of the carbon dioxide absorber.

[0009] DE 10 2016 000 268 A1 relates to a closed-circuit breathing apparatus with a bag assembly. The bag assembly comprises a stationary base element, a pressure element, and a flexible bag element for receiving a fluid. The bag element is arranged on the base element and has at least one opening. The pressure element is designed to pivot about a pivot axis. The pressure element is attached to a fastening section of the bag element and is connected thereto in such a way that, upon a transition of the pressure element from a first pivot position to a second pivot position, the pressure element pivots toward the base element.

[0010] DE 103 42 011 B3 discloses an expansion unit for closed hot water heating circuit systems. It consists of a watertight hollow body made of a flexible material and is housed in a cup-shaped container. The hollow body is loaded on its free surface by elastic elements. DISCLOSURE OF THE INVENTION

[0011] Based on this prior art, the invention is based on the object of at least partially remedying these disadvantages of breathing bags for closed-circuit breathing apparatus and of closed-circuit breathing apparatus. Therefore, the object of the present invention is to provide a breathing bag for a closed-circuit breathing apparatus and a closed-circuit breathing apparatus that simplify the manufacture of a breathing bag in the simplest and most cost-effective manner possible, while at the same time, the resulting breathing bag is as simple as possible in design and, in particular, can be provided with particularly flexible properties.

[0012] The above object is achieved by a breathing bag for a closed-circuit breathing apparatus having the features of independent claim 1.

[0013] Furthermore, the object is achieved by a closed-circuit breathing apparatus having the features of the independent claim 20.

[0014] Further features and details of the invention emerge from the subclaims, the description and the drawings.

[0015] Features and details that are described in connection with the breathing bag according to the invention naturally also apply in connection with the closed-circuit breathing apparatus according to the invention and vice versa, so that with regard to the disclosures relating to the individual aspects of the invention, reference is or can always be made to each other.

[0016] According to a first aspect of the invention, the object is achieved by a breathing bag for a closed-circuit breathing apparatus, comprising a bag element that surrounds an internal volume, wherein the bag element can reversibly assume at least one unfolded state and one folded state, and wherein, furthermore, the bag element surrounds a larger internal volume in its unfolded state than in its folded state. A breathing bag according to the invention is characterized in that the bag element has a one-piece bag section and a one-piece trough section, wherein the bag section has at least substantially greater flexibility than the trough section, and wherein the bag section, at least in the folded state, is at least partially immersed in the trough section.

[0017] A breathing bag according to the invention is intended for use in a closed-circuit breathing apparatus. In particular, a breathing bag according to the invention can form part of a counterlung of the closed-circuit breathing apparatus. For this purpose, a breathing bag according to the invention has a bag element, which in turn surrounds an internal volume. This internal volume represents a gas reservoir arranged in the breathing circuit of a user of the closed-circuit breathing apparatus. By assuming a folded or unfolded state, this internal volume surrounded by the bag element can be provided in various sizes. In an unfolded bag element, the internal volume can be larger, in particular maximal, in its unfolded state, and in a folded bag element, the internal volume can be smaller or preferably minimal in its folded state.The bag element can be reversibly converted between the folded state and the unfolded state, so that a breathing bag according to the invention can provide a variable gas volume, in particular a cyclically variable gas volume, for the breathing circuit of a user of the closed-circuit breathing apparatus.

[0018] Essential to the invention, the breathing bag according to the invention provides that the bag element of the breathing bag according to the invention has at least two sections, a bag section and a tub section. Particularly preferably, the bag element according to the invention can consist at least substantially of these two sections. According to the invention, the two sections are each formed as a single piece. In particular, both the bag section and the tub section can be formed internally without further sealing lines. An overall simpler structure of the breathing bag according to the invention, comprising at least substantially only two structural sections, can be provided in this way.

[0019] In particular, this structure of the tub section and the bag section allows the breathing bag according to the invention to have fewer sealing lines overall, thus simplifying testing of the breathing bag according to the invention for leaks after production. Production of at least the bag section and the tub section can also be made simpler, in particular in that such production can be automated. This allows for significantly simpler and faster, and thus more cost-effective, production of a breathing bag according to the invention.

[0020] When a breathing bag according to the invention is used in a closed-circuit breathing apparatus, the internal volume is cyclically increased and decreased, as described above. This can be achieved by the bag element also cyclically oscillating between its folded state and its unfolded state. In order to be able to provide this, the bag section has at least substantially greater flexibility than the trough section. At least substantially within the meaning of the invention can mean in particular that, for example, wall sections of the bag section, for example those sections of the bag section that are arranged adjacent to the trough section, are flexible. In this way, it can be ensured that the bag section collapses in on itself and at least partially immerses itself in the trough section during a transition from an unfolded state to a folded state of the bag element.In other words, it can preferably be provided that the bag section has, at least in sections, a lower Shore hardness than the tub section.

[0021] The trough section itself can even be designed to be so rigid that it at least substantially does not change its shape during the transition from the unfolded state to the folded state of the bag element of the breathing bag according to the invention. It can also be provided that the bag section also has regions of greater rigidity. For example, a ceiling region of the bag section that lies opposite the trough section can also be designed with greater rigidity, in particular even with a rigidity comparable to the rigidity of the trough section. In order to be able to provide for the at least partial immersion of the bag section into the trough section particularly easily, the trough section and the bag section can be designed to be complementary to one another, wherein the bag section can particularly preferably be designed to be minimally smaller than the trough section.

[0022] In summary, a breathing bag according to the invention can in particular provide that this breathing bag is simpler, cheaper and less complex to manufacture than known breathing bags according to the prior art.

[0023] Furthermore, by reducing the number of individual parts of the breathing bag according to the invention compared to breathing bags according to the prior art, a design of breathing bags that requires less maintenance and is more maintenance-friendly can be provided.

[0024] In a breathing bag according to the invention, it can also be further provided that the bag section has at least substantially a smaller wall thickness than the tub section. In this way, it is particularly easy to provide that the bag section has greater flexibility than the tub section. "At least substantially" within the meaning of the invention can mean, in particular, that the bag section does not have a generally smaller wall thickness than the tub section.

[0025] In the sense of the invention, it is sufficient in particular that the bag section has a smaller wall thickness than the trough section in those areas which are used or are essential for the collapse of the bag section during the transition from the unfolded state to the folded state of the bag element of the breathing bag according to the invention.

[0026] A breathing bag according to the invention can also be designed such that the bag section and the tub section comprise different materials, at least in sections. In this way, it is particularly easy to ensure that the tub section and the bag section have different properties, in particular with regard to the flexibility of the two sections. Particularly preferred materials for producing the bag section and the tub section are, for example, plastic materials and / or rubber materials. For example, thermoplastic polyurethanes (TPU or TPE-U) can be used for the two sections. Depending on the polyurethane used, more or less flexible and / or even rigid designs of the bag section or the tub section can be provided. Other possible materials are ethylene propylene diene rubbers (EPDM).These rubbers can also be used in particular in toxic environments, whereby the range of application of a breathing bag according to the invention or of a closed-circuit breathing apparatus with such a breathing bag according to the invention can be expanded.

[0027] Furthermore, in a breathing bag according to the invention, it can be provided that the bag section has an arrangement section, in particular a circumferential arrangement section, and the trough section has a counter-arrangement section, in particular a circumferential counter-arrangement section, for the material-to-material connection of the bag section and the trough section. By means of such an arrangement section and a counter-arrangement section, it can be provided particularly easily to connect the bag section and the trough section to one another in a material-to-material connection. Circumferential in the sense of the invention can mean in particular that the arrangement section or the counter-arrangement section is arranged along an edge of the respective section. The tightness of the entire bag element of the breathing bag can be ensured by means of such a circumferential arrangement section orCounter-arrangement section and the material connection of the bag section and the tub section carried out at these sections can be provided particularly easily.

[0028] According to a further development of a breathing bag according to the invention, it can further be provided that the bag section and the trough section are glued and / or welded to one another at the arrangement section and at the counter-arrangement section.

[0029] Gluing and welding represent particularly preferred embodiments of material-to-material connections for bonding a bag section or a tub section of a bag element of a breathing bag according to the invention. Welding can be used in particular in those embodiments of a breathing bag according to the invention in which the bag section and / or the tub section are constructed from a thermoplastic polyurethane. Gluing has proven particularly advantageous when the bag section or the tub section is constructed from an ethylene-propylene-diene rubber.

[0030] A breathing bag according to the invention can also be designed such that the bag section has a connecting element and the tub section has a counter-connecting element for non-positive and / or positive connection, in particular reversible and detachable connection, of the bag section to the tub section. In this alternative or additional embodiment, it can be provided in particular that the bag section and the tub section are not irreversibly arranged next to one another, but that even after the bag section has been arranged on the tub section to provide the bag element, for example for maintenance, the interior volume remains accessible by releasing the non-positive and / or positive connection of the bag section and the tub section. The connecting elements or counter-connecting elements used for this purpose can be, for example, locking elements, clip elements and / or the like.It may also be provided, for example, that the tub section and the bag section of the bag element are connected to one another both materially and non-positively and / or positively. For example, with a cuboid-shaped design of the bag element and the two sections, one side can be connected materially, while the other three sides can be connected non-positively and / or positively. In this case, the materially connected side can serve, for example, as a hinge for opening the bag element to access the interior volume of the bag element. Cleaning and / or disinfection of the interior volume of the bag element, for example during maintenance, can be provided particularly easily in this way.

[0031] In a breathing bag according to the invention, it can also be further provided that the bag section and / or the tub section have a sealing element, in particular a circumferential sealing element, for sealing the internal volume.

[0032] Such a sealing element, which can be present on either the bag section or the tub section, or even on both sections, allows for sealing of the interior volume particularly easily and with a high degree of reliability. This prevents the penetration of gases from the outside into the interior volume or the uncontrolled escape of breathing gas from the interior volume to the outside.

[0033] Furthermore, in a breathing bag according to the invention, the bag section and / or the tub section can be manufactured using an injection molding process. Such an injection molding process represents a particularly preferred manufacturing method for providing a bag section or a tub section. In particular, both the bag section and the tub section can be manufactured in their final three-dimensional form using this injection molding process, thereby avoiding the need for subsequent assembly, for example, of a cutting pattern for providing a base section or tub section.

[0034] This type of production in an injection molding process is also particularly easy to automate, whereby a production of high quantities of the bag section or the tub section for a bag element of a breathing bag according to the invention can be provided particularly easily.

[0035] According to a particularly preferred further development of a breathing bag according to the invention, it can further be provided that the arrangement section and / or the connecting element and / or the sealing element are manufactured together with the bag section in a multi-component injection molding process, and / or that the counter-arrangement section and / or the counter-connecting element and / or the sealing element are manufactured together with the trough section in a multi-component injection molding process.

[0036] The material properties of the arrangement section, the counter-arrangement section, the connecting element, the counter-connecting element and / or the sealing element are usually subject to different requirements than those of the tub section or the bag section.

[0037] For example, the connecting element and / or the counter-connecting element for providing the force-fitting and / or form-fitting connection between the bag section and the trough section must be more stable and rigid than, for example, the flexible region of the bag section which is used for folding the bag section during the transition from the unfolded state to the folded state of the bag element. By using a multi-component injection molding process, in which a specially suitable material can be used for each of these individual elements, a direct, in particular monolithic production of the respective element with the corresponding trough section or bag section can be provided. By appropriately selecting the materials used, the entire trough section or bag section can be produced in a single manufacturing process using a multi-component injection molding process.Bag section together with the arrangement section and / or counter-arrangement section and / or connecting element and / or counter-connecting element and / or sealing element arranged on it are provided with the corresponding properties of the additional elements.

[0038] Furthermore, in a breathing bag according to the invention, it can be provided that a surface of the bag section and / or the tub section facing the surrounding interior volume is roughened. Roughened in the sense of the invention can mean, in particular, that the surface has a slightly increased roughness.

[0039] In this way, for example, it is possible to prevent, or at least significantly impede, the surfaces of the bag section and the tub section from adhering to each other in the event of contact when folded. Such surface roughness can also provide a so-called lotus effect, which can prevent, or at least significantly impede, the adhesion of dust or other contaminants to the surface.

[0040] In particular, the removal of condensate that separates from the breathing air in the interior volume on the surface of the bag section and / or the tub section can be particularly well provided by such a roughened surface.

[0041] Furthermore, in a breathing bag according to the invention, it can be provided that at least one tub connection area for one of the following elements of the closed-circuit breathing apparatus is arranged on the tub section: - Absorber unit - Air conditioning unit - Drainage unit - Dosing valve unit.

[0042] This list is not exhaustive, so that, if technically sensible and possible, additional tray connection areas can also be provided on the tray section. An absorber unit can be used to remove harmful gases, preferably CO2, from the breathing air in the interior volume of the breathing bag. An air conditioning unit enables air conditioning, i.e. an increase or decrease in the temperature of the breathing air and, for example, also an adjustment of the humidity of the breathing air in the interior volume of the breathing bag. A drainage unit can be used to remove water condensed from the breathing air from the breathing bag. Finally, a metering valve unit enables additional gas, in particular oxygen, to be supplied to the breathing volume, especially if the bag element of the breathing bag falls below a minimum volume.

[0043] Furthermore, a breathing bag according to the invention can be further developed such that the at least one connection area, in particular the connection area for the metering valve unit, is designed as a pocket protruding into the interior volume. Such a pocket in the trough section is preferably an externally accessible invagination into the interior volume of the bag element. However, this pocket is separate from the interior volume itself, so that there is no connection between the interior volume and the pocket. In this way, it is possible, for example, to arrange the metering valve unit completely outside the interior volume on the bag element of a breathing bag according to the invention. During maintenance of the breathing bag, it can be ensured that cleaning and / or disinfection of the valve unit is no longer absolutely necessary.

[0044] Furthermore, a breathing bag according to the invention can be provided with at least one bag connection area for a pressure relief valve arranged on the bag section. Such a pressure relief valve can, in particular, be a volume-controlled pressure relief valve.

[0045] Such a pressure relief valve in the bag section can, in particular, prevent excessive pressure in the bag element and thus in the entire closed-circuit breathing system. This can provide regulation and / or limitation of breathing resistance for a user of a closed-circuit breathing device with a breathing bag according to the invention.

[0046] By arranging the pressure relief valve in the bag section, volume-controlled actuation of the pressure relief valve can be provided particularly easily. Since the bag section is the key section that moves and expands to assume the unfolded state of the bag element, arranging the pressure relief valve at the bag connection area of ​​the bag section makes it particularly easy to couple the triggering of the pressure relief valve to a position of the bag connection area, in particular a maximum position in the unfolded state, and the associated, in particular maximum, internal volume of the bag element.

[0047] A breathing bag according to the invention can preferably be further developed such that the bag connection area is designed as a region of the bag section with increased rigidity and, in particular, is at least substantially sleeve-like. A particularly good and secure arrangement of the pressure relief valve can thus be provided by a bag connection area with increased rigidity, since accidental and unintentional removal of the pressure relief valve from the bag connection area, for example due to excessive flexibility in the area of ​​the bag connection area, can thereby be reliably prevented. A sleeve-like design of the bag connection area can, in particular, make clipping in and out of the bag connection area particularly easy and / or further simplify it.

[0048] Furthermore, a breathing bag according to the invention can be further developed in such a way that a pressure relief valve is arranged at the bag connection area to protect the bag element against overpressure. The pressure relief valve has a valve body and a valve mechanism arranged in the valve body, wherein the valve body has a fastening section for fastening to a counter-fastening section of the bag connection area in a fastening position, wherein in the fastening position, the pressure relief valve is in fluid-communicating contact with the internal volume.

[0049] In this way, it can be provided, in particular, that the pressure relief valve can be arranged directly on the bag section of the bag element of a breathing bag according to the invention. For this purpose, the fastening section of the valve body of the pressure relief valve can be arranged on the counter-fastening section of the bag connection area. For example, in the case of a sleeve-like bag connection area, the fastening section in the valve body can represent a circumferential groove in the valve body. By simply pressing or clipping the entire valve body into the sleeve-like bag connection area, the pressure relief valve can be arranged particularly easily on the bag section or on the bag element. It is particularly preferably provided, in particular, that the pressure relief valve is directly connected to the breathing bag or the internal volume of the breathing bag in a fluid-communicating manner. There is no need to provide hoses orThis eliminates the need for lines between the bag element of the breathing bag and the pressure relief valve. This allows for a simpler seal, particularly by eliminating sealing lines between the tubes or lines and the bag element or pressure relief valve.

[0050] Furthermore, a breathing bag according to the invention can be further developed such that the fastening section and / or the counter-fastening section has a sealing section for sealing the valve body against the bag connection area. A particularly good seal in the bag connection area between the bag section and the pressure relief valve can be provided in this way. Inadvertent or uncontrolled escape or inflow of gases from or into the interior volume can thus be reliably prevented.

[0051] Alternatively, a breathing bag according to the invention can be designed such that the valve body is formed integrally with the bag connection area, in particular using a multi-component injection molding process. In this way, an even better seal of the internal volume of the breathing bag in the area of ​​the bag connection area can be provided, since no sealing line needs to be created between the valve body and the bag section. This can be achieved, in particular, by forming the valve body as an integral part of the bag section.

[0052] The use of a multi-component injection molding process also makes it possible, in particular, to provide the properties required for the valve body and the bag connection area, for example with regard to flexibility or rigidity, particularly easily and with great variability.

[0053] A breathing bag according to the invention can also be further developed such that the valve body, and in particular the valve mechanism, are rotationally symmetrical or substantially rotationally symmetrical. This makes it possible to ensure that the valve body or the entire pressure relief valve is particularly easy to install. This is particularly possible because a rotationally symmetrical pressure relief valve does not have a preferred direction with respect to its rotational axis, which would have to be observed when installing the pressure relief valve on the bag connection area.

[0054] Furthermore, in a breathing bag according to the invention, the bag section can be provided with a frame element for the positive and / or non-positive arrangement of a breathing bag plate. Such a breathing bag plate is used, for example, to exert or maintain a certain pressure on the breathing gas in the interior volume of the bag element. A frame element on the bag section can provide particularly simple and secure fastening and / or arrangement of such a breathing bag plate on the bag element of a breathing bag according to the invention.

[0055] Alternatively, in a breathing bag according to the invention, it can be provided that a breathing bag plate is formed integrally with the bag section, in particular that the breathing bag plate is manufactured together with the bag section using a multi-component injection molding process. In this further improvement of a breathing bag according to the invention, it is particularly provided that the breathing bag plate is manufactured as an integral component of the bag section. A multi-component injection molding process can preferably be used for this purpose, whereby the required properties of the breathing bag plate or the remaining bag section can be provided particularly easily and in particular in a single manufacturing step by using suitable materials as components during injection molding.

[0056] Particularly preferably, a breathing bag according to the invention can be designed such that the bag element essentially has one of the following shapes: - Cuboid - bars - Double bars - Cylinder - lens - Bullet

[0057] In particular, this list is not exhaustive, so that a breathing bag according to the invention or the bag element of a breathing bag according to the invention can also have other shapes, provided that this is technically reasonable and possible.

[0058] According to a second aspect of the invention, the object is achieved by a closed-circuit breathing apparatus, comprising at least a counterlung, a filter device, an oxygen source and a housing, wherein the counterlung, the filter device and the oxygen source are arranged in the housing.

[0059] A closed-circuit breathing apparatus according to the invention is characterized in that the counterlung comprises a breathing bag according to the first aspect of the invention. All the advantages described in detail with regard to a breathing bag according to the first aspect of the invention can thus also be provided by a closed-circuit breathing apparatus according to the second aspect of the invention, the counterlung of which comprises a breathing bag according to the first aspect of the invention. PREFERRED EMBODIMENTS

[0060] Further measures improving the invention will become apparent from the following description of exemplary embodiments of the invention, which are illustrated in the figures. All features and / or advantages apparent from the claims, the description, and the drawings, including structural details and spatial arrangements, may be essential to the invention both individually and in various combinations.

[0061] Elements with the same function and mode of operation are provided with the same reference symbols in the drawings.

[0062] They show schematically: Fig. 1 a breathing bag according to the invention of a closed-circuit breathing apparatus according to the invention, Fig. 2 another breathing bag according to the invention of a breathing apparatus according to the invention, Fig. 3 a breathing bag according to the invention in its unfolded state, Fig. 4 a breathing bag according to the invention in its folded state, Fig. 5 a bag connection area with a pressure relief valve, and Fig. 6 another breathing bag according to the invention.

[0063] Fig. 1 shows a breathing bag 1 according to the invention of a closed-circuit breathing apparatus 100 according to the invention. The breathing bag 1 is shown in particular in its unfolded state 4, in which an internal volume 3 (not shown) of the breathing bag 1 is particularly large, in particular maximal.

[0064] Essential to the invention, a breathing bag 1 according to the invention comprises a bag element 2, which in turn is constructed from a bag section 10 and a trough section 20. Particularly preferably, the bag element 2 can consist at least substantially of the bag section 10 and the trough section 20. In the illustrated embodiment, the bag section 10 and the trough section 20 are integrally connected to one another at an arrangement section 11 and a counter-arrangement section 21, in particular, for example, glued and / or welded.

[0065] In order to provide the functionality of the breathing bag 1, the bag element 2 can, in particular, in addition to the unfolded state 4 shown, also assume a folded state 5 (not shown), in which the bag section 10 is at least partially immersed in the trough section 20.

[0066] For this purpose, the bag section 10 has, at least in sections, a greater flexibility than the tub section 20.

[0067] Preferably, it can even be provided that the trough section 20 is rigid in itself and does not change its shape or at least does not change substantially during the transition from the unfolded state 4 to the folded state 5.

[0068] This also enables or facilitates, for example, the arrangement of a plurality of tray connection areas 23 in the tray section 20, which can be provided, for example, for absorber units, air conditioning units, drainage units, and / or metering valves. The greater flexibility of the bag section 10 can be achieved, for example, by a smaller wall thickness of the bag section 10 compared to the tray section 20 or, alternatively or additionally, by a correspondingly different material selection for the bag section 10 and the tray section 20. Furthermore, the bag section 10 can have a bag connection area 13, which, as shown, can have a counter-fastening section 14 and a sealing section 15 for the arrangement of a pressure relief valve 40 (not shown).Furthermore, a frame element 16 for arranging a breathing bag plate 6 (not shown) can be provided as an integral part on the bag section 10. An injection molding process has proven particularly advantageous for producing the tub section 20 or the bag section 10. In this way, a three-dimensional shape of the bag section 10 or the tub section 20 can be produced particularly easily in a single manufacturing step.

[0069] This makes it particularly easy to avoid the laborious preparation of a pattern and subsequent material-to-material bonding to form a three-dimensional shape. Furthermore, the injection molding process can be implemented as a multi-component injection molding process, which allows the required properties to be provided particularly easily, particularly for specific areas of the bag section 10 or the tub section 20, such as the arrangement section 11, the counter-arrangement section 21, or the tub connection areas 23 or the bag connection area 13, through a suitable selection of the materials used.

[0070] In Fig. 2 is the bag element 2 of the breathing bag 1 as in Fig. 1, wherein connecting sleeves are additionally arranged at the tub connection areas 23. Furthermore, the breathing bag plate 6 is arranged on the frame element 16 of the bag section 10, and the pressure relief valve 40 is inserted into the bag connection area 13.

[0071] As shown, the pressure relief valve 40 can be at least substantially rotationally symmetrical, in particular, for example, the valve body 41 (not shown) of the pressure relief valve 40, whereby an arrangement of the pressure relief valve 40 in the bag connection area 13 can be facilitated. Regarding the further properties and details of the breathing bag 1 shown, Fig. 1.

[0072] The Fig. 3 and Fig. 4 now show a schematic sectional view of a breathing bag 1 according to the invention, in Fig. 3 in its unfolded state 4, in Fig. 4 in its folded state 5. In the following, both figures are therefore described together, with the details being discussed separately in each case. The bag element 2 of the illustrated breathing bag 1 according to the invention again has a bag section 10 and a trough section 20. It is already clearly visible here that at least in sections the bag section 10 has a smaller wall thickness than the trough section 20. In this way, the greater flexibility of the bag section 10 compared to the trough section 20 can be provided particularly easily. The internal volume 3 surrounded by the bag element 2 is also shown, wherein in comparison with Fig. 3 and Fig. 4 it is visible that the internal volume 3 surrounded in the unfolded state 4 is larger than the internal volume 3 surrounded in the folded state 5. On the right-hand side, an arrangement section 11 and a counter-arrangement section 21 are shown, in which the bag section 10 and the trough section 20 are materially connected to one another, in particular glued and / or welded. On the opposite left-hand side, connecting elements 12 and counter-connecting elements 22 are visible, which, as part of the bag section 10 and trough section 20, can provide a force-fitting or material-fitting connection between the trough section 20 and the bag section 10. In this illustrated embodiment, a snap-in connection is schematically realized. In addition, a sealing element 30 is shown adjacent to it, by means of which the tightness of the internal volume 3 of the bag element 2 of the breathing bag 1 according to the invention can be increased.The force-fitting and / or form-fitting connection of the tub section 20 and the bag section 10 by the connecting elements 12 or counter-connecting elements 22 can in particular ensure that the inner volume 3 of the bag element 2 remains accessible, for example for maintenance work.

[0073] In addition, at least in Fig. 3 shows a surface 31 of the bag section 10 or the tub section 20, which faces the inner volume 3. In Fig. In Figure 4, the surfaces are shown without reference numerals for clarity. According to the invention, this surface 31 can be roughened, for example, to prevent the bag section 10 from adhering to the tub section 20, particularly in the folded state 5. Such roughness can also provide a so-called lotus effect to prevent the adhesion of dust and / or contaminants and / or condensation.

[0074] The two Fig. 3 and Fig. 4 differ in particular in that in Fig. 3 the bag element 2 in the unfolded state 4, in Fig. 4 in the folding state 5 is shown.

[0075] It is clearly visible that only the bag section 10 changes its shape during this transition from the unfolded state 4 to the folded state 5. This can be achieved in particular by the bag section 10 having greater flexibility, for example, caused by a smaller wall thickness, than the trough section 20.

[0076] In Fig. 5 shows a bag connection area 13 in the bag section 10 of a bag element 2 in a sectional view, wherein in this bag connection area 13 a pressure relief valve 40 is arranged in its fastening position 44.

[0077] It is clearly visible that the bag connection area 13 is designed in a sleeve-like manner, whereby the counter-fastening section 14 can engage particularly easily into a groove-like fastening section 42 of the valve body 41. At the same time, a sealing section 15, as part of the counter-fastening section 14, can also engage into the groove-like fastening section 42 in order to provide a particularly secure seal for the bag connection area 13.

[0078] According to the invention, the valve mechanism 43 or the valve body 41 of the pressure relief valve 40 is arranged such that it is fluidly connected to the internal volume 3. A direct arrangement of the pressure relief valve 40 on the bag section 10 can be provided in this way. Alternatively, it can also be provided that the valve body 41 is formed integrally with the bag section 10, in particular the bag connection area 13. An even better seal of the entire bag element 2 can be provided in this way.

[0079] In Fig. 6 shows a further sectional view of a breathing bag 1 according to the invention in its unfolded state 4. In addition to the Fig. 5 already described pressure relief valve, 40, which is also shown here in its fastening position 44 in the bag connection area 13, is in Fig. 6 in particular a tub connection area 23 is shown, which is designed as a pocket 24.

[0080] This pocket 24 protrudes as an invagination into the inner volume 3 of the bag element 2, whereby the pocket 24 remains accessible from outside the bag element 2, but has no direct connection to the inner volume 3. An element arranged in the pocket 24, for example an actuating lever of a metering valve unit, can thus be deflected without direct contact with the inner volume 3.

[0081] By avoiding direct contact of the dosing valve unit with the internal volume 3, cleaning or disinfection of the dosing valve unit is no longer absolutely necessary. Furthermore, the bag section 10 and the tub section 20 are also shown here, which in turn each have a surface 31 and are connected to each other at arrangement sections 11 and counter-arrangement sections 21, respectively. The frame element 16 as part of the bag section 10 is also shown in Fig. 6 shown. LIST OF REFERENCE SYMBOLS 1 breathing bag 2 bag element 3 Internal volume 4 Development state 5 Folding state 6 Breathing bag plate 10 bag sections 11 Arrangement section 12 connecting element 13 Bag connection area 14 Counter-fastening section 15 Sealing section 16 frame element 20 tub section 21 Counter arrangement section 22 Counter-connecting element 23 Bath connection area 24 bags 30 sealing element 31 Surface 40 pressure relief valve 41 Valve body 42 fastening section 43 Valve mechanism 44 Mounting position 100 closed-circuit breathing apparatus

Claims

[1] Breathing bag (1) for a closed-circuit breathing apparatus (100), comprising a bag element (2) surrounding an internal volume (3), wherein the bag element (2) reversibly has at least one deployment state (4) and a can assume a folded state (5), and further wherein the bag element (2) in its unfolded state (4) surrounds a larger internal volume (3) than in its folded state (5), wherein the bag element (2) has a one-piece bag section (10) and a one-piece tub section (20), wherein the bag section (10) has a higher flexibility than the tub section (20) and wherein the bag section (10) at least in the folded state (5) is at least partially immersed in the tub section (20), characterized by , that the bag section (10) and the tub section (20) are produced as a multi-component injection molding and comprise different materials from one another, that the bag section (10) has an arrangement section (11), that the tub section (20) has a counter-arrangement section (21), and that the bag section (10) and the tub section (20) are materially connected to one another at the arrangement section (11) and at the counter-arrangement section (21). [2] Breathing bag (1) according to claim 1, characterized by that the bag section (10) has a smaller wall thickness than the tub section (20). [3] Breathing bag (1) according to one of the preceding claims, characterized by that the bag section (10) and the trough section (20) are glued and / or welded together at the arrangement section (11) and at the counter-arrangement section (21). [4] Breathing bag (1) according to one of the preceding claims, characterized bythat the bag section (10) has a connecting element (12) and the tub section (20) has a counter-connecting element (22) for non-positively and / or positively connecting the bag section (10) to the tub section (20). [5] Breathing bag (1) according to one of the preceding claims, characterized by that the bag section (10) and / or the tub section (20) have a sealing element (30) for sealing the internal volume (3). [6] Breathing bag (1) according to one of the preceding claims, characterized by that the bag section (10) and / or the tub section (20) are manufactured using an injection molding process. [7] Breathing bag (1) according to one of the preceding claims, characterized by , that the arrangement section (11) and / or the connecting element (12) and / or the sealing element (30) are manufactured together with the bag section (10) in a multi-component injection molding process, and / or that the counter-arrangement section (21) and / or the counter-connecting element (22) and / or the sealing element (30) are manufactured together with the tub section (20) in a multi-component injection molding process. [8] Breathing bag (1) according to one of the preceding claims, characterized by that a surface (31) of the bag section (10) and / or the tub section (20) facing the surrounding internal volume (3) is roughened. [9] Breathing bag (1) according to one of the preceding claims, characterized by that at least one tub connection area (23) for one of the following elements of the closed-circuit breathing apparatus (100) is arranged on the tub section (20): - Absorber unit - Air conditioning unit - Drainage unit - Dosing valve unit [10] Breathing bag (1) according to claim 9, characterized bythat the connection area for the metering valve unit is designed as a pocket (24) projecting into the inner volume (3). [11] Breathing bag (1) according to one of the preceding claims, characterized by that at least one bag connection area (13) for a pressure relief valve (40) is arranged on the bag section (10). [12] Breathing bag (1) according to claim 11, characterized by that the bag connection area (13) is designed as an area of the bag section (10) with increased rigidity and in a sleeve-like manner. [13] Breathing bag (1) according to claim 11 or 12, characterized by , that a pressure relief valve (40) for protecting the bag element (2) against overpressure is arranged on the bag connection area (13), the pressure relief valve (40) comprising a valve body (41) and a valve mechanism (43) arranged in the valve body (41), wherein the valve body (41) has a fastening section (42) for fastening to a counter-fastening section (14) of the bag connection area (13) in a fastening position (44), wherein in the fastening position (44) the pressure relief valve (40) is in fluid-communicating contact with the internal volume (3). [14] Breathing bag (1) according to claim 13, characterized by , that the fastening section (42) and / or the counter-fastening section (14) has a sealing section (15) for sealing the valve body (41) against the bag connection area (13). [15] Breathing bag (1) according to claim 13, characterized by that the valve body (41) is formed integrally with the bag connection area (13) in a multi-component injection molding process. [16] Breathing bag (1) according to one of claims 13 to 15, characterized bythat the valve body (41) and the valve mechanism (43) are rotationally symmetrical. [17] Breathing bag (1) according to one of the preceding claims, characterized by that the bag section (10) has a frame element (16) for the positive and / or non-positive arrangement of a breathing bag plate (6). [18] Breathing bag (1) according to one of the preceding claims 1 to 16, characterized by that a breathing bag plate (6) is formed integrally with the bag section (10) and the breathing bag plate (6) together with the bag section (10) are manufactured in a multi-component injection molding process. [19] Breathing bag (1) according to one of the preceding claims, characterized by that the bag element (2) has one of the following shapes: - Cuboid - bars - Double bars - Cylinder - lens - Bullet [20] Closed-circuit breathing apparatus (100), comprising at least one counterlung, a filter device, an oxygen source and a housing, wherein the counterlung, the filter device and the oxygen source are arranged in the housing, characterized by that the counterlung has a breathing bag (1) according to one of the preceding claims.

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