EP3838350A1 - Fan device for a respiratory protection system - Google Patents

Abstract

The invention is based on a blower device for a respiratory protection system (10a), with a fan (48a; 48b) for generating an air flow (50a; 50b), with at least one filter element (52a; 52b), which is provided by the Air flow (50a; 50b) to be flowed through, with a housing unit (58a; 58b) accommodating the fan (48a; 48b) and the at least one filter element (52a; 52b) and with an air duct (82a) accommodating the filter element (52a; 52b) ; 82b), which is provided for guiding the air flow (50a) between the filter element (52a) and the fan (48a). It is proposed that the air duct (82a; 82b) be formed separately from the housing unit (58a; 58b) and the at least one filter element (52a; 52b) is firmly integrated into the air duct (82a; 82b).

Description

State of the art

The invention relates to a blower device for a respiratory protection system.

It is already a blower device for a respiratory protection system, with a fan for generating an air flow, with at least one filter element which is provided for the air flow to flow through, with a housing unit that accommodates the fan and the at least one filter element and with a Filter element receiving air duct, which is provided for guiding the air flow between the filter element and the fan, has been proposed.

The object of the invention is in particular to provide a device of the generic type with improved properties with regard to compactness and convenience. The object is achieved according to the invention by the features of claim 1, while advantageous configurations and developments of the invention can be found in the subclaims.

Advantages of the invention

The invention is based on a blower device for a respiratory protection system, with a fan for generating an air flow, with at least one filter element which is provided for the air flow to flow through, with a housing unit accommodating the fan and the at least one filter element and with an air duct receiving the filter element, which is provided to guide the air flow between the filter element and the fan.

It is proposed that the air duct is designed separately from the housing unit and that the at least one filter element is firmly integrated into the air duct. Preferably, the air duct is formed by a separate component, which is made of the Housing unit can be removed. The air duct is in particular formed by an exchangeable component. The housing unit preferably has at least two housing shells, from which the air duct is formed separately. In principle, it would be conceivable that the air duct is permanently connected to an exchangeable cover. The filter element is preferably connected directly to the air duct. In particular, the filter element is connected to the air duct without an additional, in particular separate, filter housing.

The fan is preferably arranged at least partially next to the at least one filter element, the air flow being deflected between the fan and the filter element. The filter element and the fan are preferably arranged in the common housing unit. The blower device is in particular formed by a compact blower device. The blower device is provided in particular to be carried on the body, such as for example on the back and / or on the hip.

In this context, a “blower device” is to be understood as meaning, in particular, a device which is provided for actively generating an air flow to supply a user with breathing air. In an operation, the blower device is provided in particular to supply the air flow to a mouth protection device of the respiratory protection system. The blower device is preferably connected to the mouth protection device of the respiratory protection system via at least one breathing air supply line. The blower device is preferably provided in an operation to suck in air from an environment, to clean the air, in particular to filter it, and to actively supply the cleaned air to a user, in particular via the mouth protection device. The blower device is preferably provided for generating an active air flow. The blower device is provided in particular to generate an overpressure air flow. In an operation, the fan is provided in particular to actively generate an air flow. The fan is provided in particular for actively sucking in air from an environment and for actively transporting the air to the mouth protection device of the respiratory protection system. The fan is formed in particular by an axial fan and / or radial fan. In this context, a “filter element” is to be understood as meaning, in particular, an element which in an operation becomes a Filtering of the air flow is provided. For this purpose, the filter element preferably has a filter through which the air flow flows during operation. The air stream preferably flows completely through the filter of the filter element. The filter element is provided in particular to separate particles, in particular suspended matter, from the air flow. Various filters that appear useful to a person skilled in the art are conceivable. The filter of the filter element is preferably formed in particular by a particulate filter. The filter is preferably designed as a depth filter or cake filter, in particular as a lamellar filter.

The fact that "the fan is arranged at least partially next to the at least one filter element" should in particular be understood in this context to mean that the fan is free of complete overlap with the filter element in a direction perpendicular to a main plane of extent of the fan. A normal vector of the main extension plane of the fan, which runs through a geometric center point of the fan, is preferably free of an intersection with the filter element. The fan and the filter element are preferably arranged next to one another in a main plane of extent of the fan device. Preferably, the fan and the filter element, viewed perpendicular to the main plane of extent of the fan device, are at least substantially free, in particular completely free, from mutual overlap. A "main extension plane" of a structural unit is to be understood in particular as a plane which is parallel to a largest side surface of a smallest imaginary cuboid, which just completely surrounds the structural unit, and in particular runs through the center of the cuboid. In this context, “at least substantially” is to be understood in particular to mean that a deviation from a predefined value deviates in particular less than 25%, preferably less than 10% and particularly preferably less than 5% of the predefined value. “Provided” is to be understood in particular as specifically programmed, designed and / or equipped. The fact that an object is provided for a specific function is to be understood in particular to mean that the object fulfills and / or executes this specific function in at least one application and / or operating state.

In this context, an “air duct” is to be understood in particular as a component forming a duct which is provided for an air duct. The air duct is preferably provided to at least partially limit the air flow. The air guide channel forms in particular a guide channel which is provided for guiding the air flow, the air guide channel being provided in particular for a defined deflection of the air flow. The air duct preferably forms a deflection between the filter element and the fan. The deflection can take place, for example, in the form of a curve, a curvature, a kink or the like. Preferably, an inflow axis and / or an inflow direction of the air flow into the air duct is substantially different and / or substantially offset from an outflow axis and / or an outflow direction of the air flow from the guide duct. The fact that the “filter element is firmly integrated into the air duct” is to be understood in this context in particular as meaning that the filter element is firmly connected to the air duct. Preferably, the filter element is at least essentially non-detachably connected to the air duct. "At least essentially non-detachable" is to be understood here in particular as a connection of at least two elements, which can only be achieved with the aid of cutting tools, such as a saw, in particular a mechanical saw etc., and / or chemical separating agents, such as solvents etc. , are separable from each other.

The configuration according to the invention makes it possible, in particular, to provide an advantageously compact, in particular flat, blower device. In particular, a direct coupling of the air duct and the filter element can be achieved. In this way, a tight fit of the filter element can be achieved in a particularly advantageous manner. In particular, additional seals and frames can be dispensed with. In this way, in particular, an advantageously low overall height of the fan device can be achieved. Furthermore, an advantageously simple change of the filter element can be achieved in this way. The filter element can particularly advantageously be exchanged together with the air duct.

It is also proposed that the air duct and the at least one filter element form a filter change module. The air duct and the at least one filter element are preferably designed as an exchangeable filter exchange module which is exchanged as a unit for exchanging the filter element. In this context, a "filter change module" is intended to mean, in particular, an exchangeable one Module, in particular assembly module, are understood. Preferably, this is to be understood in particular as a replaceable module with a plurality of components which are provided to be preassembled to form a unit, which is then assembled as a whole in a further unit, in particular the blower device. Preferably, the entire filter change module is also exchanged when it is exchanged. As a result, an advantageously simple change of the filter element can be achieved in particular. The filter element can particularly advantageously be exchanged together with the air duct.

It is further proposed that the at least one filter element is at least partially materially connected to the air duct. The at least one filter element is preferably glued to the air duct. “Cohesively connected” is to be understood in particular to mean that the mass parts are held together by atomic or molecular forces, for example during soldering, welding, gluing and / or vulcanizing. In particular, a direct coupling of the air duct and the filter element can thereby be achieved. In this way, a tight fit of the filter element can be achieved in a particularly advantageous manner. In particular, additional seals and frames can be dispensed with. In this way, in particular, an advantageously low overall height of the fan device can be achieved. Furthermore, an advantageously simple change of the filter element can be achieved in this way. The filter element can particularly advantageously be exchanged together with the air duct.

It is also proposed that the air duct forms a filter frame of the at least one filter element. The air duct is preferably provided for positioning and / or stabilizing the filter element. The filter element is preferably designed free of its own frame. The filter of the filter element is particularly preferably introduced directly into the air duct. In particular, the filter of the filter element is glued directly into the air duct. In this way, in particular, an advantageously compact, in particular flat, fan device can be provided.

It is further proposed that the air duct is provided to deflect an air flow between the fan and the filter element. The air flow between the fan and the filter element is preferably by at least 50 °, preferably by at least 90 °, preferably by at least 140 ° and particularly preferably by at least Deflected 180 °. The fact that the "air flow between the fan and the filter element is deflected" is to be understood in this context in particular to mean that the air flow changes its direction during operation of the blower device on a path between the filter element and the fan, in particular within the air duct. In this context, the direction of the air flow is to be understood in particular as an averaged direction of movement of the particles of the air flow at a point. The air guide channel, which is provided for guiding the air flow, is preferably arranged at least partially between the filter element and the fan, the air guide channel being provided for a defined deflection of the air flow. The air duct preferably forms a deflection between the filter element and the fan. The deflection can take place, for example, in the form of a curve, a curvature, a kink or the like. Preferably, an inflow axis and / or an inflow direction of the air flow into the air duct is substantially different and / or substantially offset from an outflow axis and / or an outflow direction of the air flow from the air duct. In this way, in particular, an advantageously compact, in particular flat, fan device can be provided. In particular, direct stacking of the fan and the filter unit can be dispensed with. In this way, in particular, an advantageously low overall height of the blower device can be achieved.

It is further proposed that a direction of inflow of the air flow into the air duct is substantially different from a direction of the air flow out of the air duct. The air duct preferably has an inlet opening, the inflow direction running perpendicular to a plane of the inlet opening. A direction of inflow of the air flow into the air duct preferably runs perpendicular to a main plane of extent of the filter element. Preferably, the air duct also has an outlet opening, the outflow direction running perpendicular to a plane of the outlet opening. The inflow direction defines, in particular, an averaged direction of the air flow when it enters the air duct. The outflow direction defines in particular an averaged direction of the air flow when it emerges from the air duct. An angle between the direction of inflow of the air stream into the air duct and the outflow direction of the air stream from the air duct is preferably more than 40 °, preferably more than 60 ° and particularly preferably more than 80 °. In this way, in particular, an advantageously compact arrangement of the air duct can be achieved and the filter element can be achieved. In this way, in particular, an advantageously compact, in particular flat, blower device can be provided.

It is further proposed that the air duct has an inlet opening and an outlet opening, an opening cross section of the inlet opening being significantly larger than an opening cross section of the outlet opening. Preferably, an area of the opening cross section of the inlet opening is at least twice as large as an area of the opening cross section of the outlet opening. An area of the opening cross section of the inlet opening is preferably at least 3 times, preferably at least 4 times and particularly preferably at least 5 times as large as an area of the opening cross section of the outlet opening. The area of the opening cross section of the inlet opening corresponds in particular at least approximately to an area of the filter element in the main plane of extent of the filter element. The opening cross section of the inlet opening preferably extends parallel to a main plane of extent of the filter element. In this way, in particular, advantageous air guidance can be achieved. In this way, in particular, an advantageously compact, in particular flat, blower device can be provided.

It is also proposed that the blower device has a further filter element which, in addition to the fan and which is firmly integrated into the air duct. The further filter element is preferably arranged next to the fan and / or next to the one filter element and its direction of flow of the air flow is different from a direction of flow of the air flow through the fan and / or the filter element. The further filter element is preferably arranged next to the fan. Furthermore, the direction of flow of the air flow through the further filter element is preferably different from a direction of flow of the air flow through the fan. In this way, in particular, an advantageously compact arrangement of the fan, the filter element and a further filter element can be achieved. In this way, in particular, an advantageously compact, in particular flat, blower device can be provided.

It is further proposed that the air duct, the filter element and the further filter element form a filter change module, in particular an alternative filter change module. Preferably, the air duct, the filter element and the further filter element are designed as an exchangeable filter change module, which becomes one Replacement of the filter element is exchanged as a unit. In particular, it is conceivable that different filter change modules can be used depending on an application. In particular, the filter change module or the alternative filter change module can be used. As a result, an advantageously simple change of the filter element can be achieved in particular. The filter element can particularly advantageously be exchanged together with the air duct.

It is also proposed that the housing unit have a thickness of less than 70 mm. The housing unit preferably has a thickness of less than 50 mm. The housing unit is used in particular to protect and align the fan and the filter element. The blower device preferably also has an energy store for supplying energy to the fan, which energy store is also accommodated in the housing unit. In this context, a “thickness” of the housing unit should be understood to mean, in particular, a maximum extension of the housing unit perpendicular to a main extension plane of the housing unit. In particular, an advantageously compact blower device can thereby be provided.

It is also proposed that the fan be provided to generate a volume flow of the air flow of at least 50 l / min and a maximum of 250 l / min. The fan is preferably provided to generate a volume flow of the air flow of at least 80 l / min and a maximum of 120 l / min. In this way, in particular, an advantageously compact and powerful blower device can be provided.

Furthermore, the invention is based on a breathing protection system, in particular a blower breathing protection system, with the blower device and with at least one mouth protection device. It is proposed that the at least one blower device is provided for generating an overpressure in the mouth protection device. The at least one blower device is preferably provided for generating a relative overpressure with respect to the surroundings in the mouth protection device. In this context, a “respiratory protection system” is to be understood in particular as a system with a blower device and a mouth protection device which is provided for actively providing an air flow to a respiratory air supply for a user. The respiratory protection system is provided in particular to generate an air flow by means of a blower device in an operation, which the mouth protection device of the Respiratory protection system is supplied. The blower device is preferably connected to the mouth protection device of the respiratory protection system via at least one breathing air supply line. The respiratory protection system is preferably provided to suck in air from an environment during operation by means of the blower device, to clean the air, in particular to filter it, and to actively supply the cleaned air to a user by means of the mouth protection device. In this context, a "mouthguard device" is to be understood in particular as a mouthguard forming device which is provided to be worn at least in a part of the mouth and / or nose of a user. The device is preferably provided to form a breathing area in front of the mouth and / or nose area of a user, which is continuously supplied with breathing air during operation. The mouth protection device is preferably provided to directly supply a user with breathing air and to protect the mouth and / or nose area of a user from external influences, in particular from gases, particles and / or suspended matter. The mouth protection device is preferably free from obscuring the eyes, in particular an eye area, of a user. The mouth protection device preferably has a mask base body, which is provided to cover a mouth and / or nose part of a user and which at least partially delimits a breathing area, and at least one breathing air supply line connected to the mask base body, the at least one breathing air channel opening into the breathing area limited, which is provided for guiding an active breathing air flow. In this way, in particular, an advantageously comfortable breathing protection system can be provided. In particular, a reliable supply of breathing air can be achieved.

The blower device according to the invention and / or the respiratory protection system should / are not limited to the application and embodiment described above. In particular, the blower device according to the invention and / or the respiratory protection system can have a number of individual elements, components and units that differs from a number of individual elements, components and units mentioned herein in order to fulfill a mode of operation described herein. In addition, in the case of the value ranges specified in this disclosure, values lying within the stated limits should also be deemed disclosed and can be used in any way.

drawings

Further advantages emerge from the following description of the drawings. Two exemplary embodiments of the invention are shown in the drawings. The drawings, the description and the claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into meaningful further combinations.

Fig. 1

ein Atemschutzsystem mit einer Gebläsevorrichtung, mit einer Mundschutzvorrichtung, mit einer Weste und mit einer externen Bedieneinheit und einen Benutzer in einer schematischen Darstellung,

Fig. 2

die Gebläsevorrichtung des Atemschutzsystems in einer schematischen Draufsicht,

Fig. 3

die Gebläsevorrichtung des Atemschutzsystems, mit einem Lüfter und mit einem Filterelement in einer schematischen Schnittdarstellung entlang der Schnittlinie II-II,

Fig. 4

die Mundschutzvorrichtung des Atemschutzsystems und einen Kopf des Benutzers in einer schematischen Darstellung,

Fig. 5

die Mundschutzvorrichtung des Atemschutzsystems in einer schematischen Teilschnittdarstellung,

Fig. 6

einen Teilausschnitt der Mundschutzvorrichtung des Atemschutzsystems in einer schematischen Schnittdarstellung und

Fig. 7

eine alternative Gebläsevorrichtung eines Atemschutzsystems, mit einem Lüfter, mit einem Filterelement und mit einem weiteren Filterelement in einer schematischen Schnittdarstellung.

Show it:

Fig. 1

a breathing protection system with a blower device, with a mouth protection device, with a vest and with an external operating unit and a user in a schematic representation,

Fig. 2

the blower device of the respiratory protection system in a schematic top view,

Fig. 3

the blower device of the respiratory protection system, with a fan and with a filter element in a schematic sectional view along the section line II-II,

Fig. 4

the mouth protection device of the respiratory protection system and a head of the user in a schematic representation,

Fig. 5

the face mask of the respiratory protection system in a schematic partial sectional view,

Fig. 6

a partial section of the mouth protection device of the respiratory protection system in a schematic sectional view and

Fig. 7

an alternative blower device of a respiratory protection system, with a fan, with a filter element and with a further filter element in a schematic sectional view.

Description of the exemplary embodiments

The Figure 1 shows a respiratory protection system 10a. The breathing protection system 10a is formed by a blower breathing protection system. The breathing protection system 10a is formed in particular by a blower breathing protection system of safety class TH3. The respiratory protection system 10a is provided to protect a user 18a from particles such as smoke, aerosols and / or dust. Furthermore, the respiratory protection system 10a additionally protect against unpleasant smells and harmful ozone. In particular, it is conceivable that the respiratory protection system 10a protects the user 18a from organic, inorganic and / or acidic gases in environments with harmful or even toxic gases. The respiratory protection system 10a has a blower device 14a and a mouth protection device 12a. The blower device 14a is provided for generating a breathing air flow 26a. The blower device 14a is provided for generating a breathing air flow 26a for the mouth protection device 12a.

The blower device 14a has a housing unit 58a. The housing unit 58a is formed by a plastic housing. The housing unit 58a has two housing shells 70a, 72a connected to one another, namely a first housing shell 70a and a second housing shell 72a. The first housing shell 70a has two openable covers 74a, 76a, via which an interior of the housing unit 58a can be made accessible. The second housing shell 72a forms a rear side of the housing unit 58a, which in a worn state faces the user 18a. The second housing shell 72a is curved concavely on an outer side. The curvature of the second housing shell 72a is adapted to the curvature of the back of a person. The housing unit 58a also has a plurality of air inlet openings 78a. The air inlet openings 78a are formed by slots in the first housing shell 70a. During operation, the air inlet openings 78a serve to draw in ambient air by means of an air flow 50a. The housing unit 58a also has an air outlet opening 80a. The air outlet opening 80a is formed by a hose connection piece on the first housing shell 70a. During operation, the air outlet opening 80a serves to output the cleaned air flow 50a, in particular a breathing air flow 26a. During operation, the breathing air flow 26a is passed on from the air outlet opening 80a to the mouth protection device 12a ( Figure 1 , 2 ).

The housing unit 58a has a thickness d of less than 70 mm. The housing unit 58a has a thickness d of less than 50 mm.

Furthermore, the blower device 14a has a fan 48a for generating an air flow 50a. The blower device 14a is provided for generating an overpressure in the mouth protection device 12a. The fan 48a is to a generation an overpressure is provided in the mouth protection device 12a. The fan 48a is provided to generate a volume flow of the air flow 50a of at least 50 l / min and a maximum of 250 l / min. The fan 48a is provided to generate a volume flow of the air flow 50a of at least 80 l / min and a maximum of 120 l / min. During operation, the blower device 14a is provided by means of the fan 48a to generate a relative overpressure with respect to the surroundings in the mouth protection device 12a. The fan 48a is formed by an electric radial fan. In principle, however, a different configuration that appears sensible to a person skilled in the art would also be conceivable. The fan 48a is arranged in the housing unit 58a. A main extension plane 56a of the fan 48a extends at least substantially parallel to a main extension plane of the housing unit 58a. The fan 48a is arranged in an upper region of the blower device 14a. The air outlet opening 80a is arranged on an outlet side of the fan 48a. The blower device 14a also has a control and / or regulating unit 86a for controlling and / or regulating the fan 48a during operation. The control and / or regulating unit 86a is provided in particular for an automatic adjustment of a power level of the fan 48a. The control and / or regulating unit 86a is provided to set an air flow level of the fan 48a as a function of saturation of a filter element 52a. Furthermore, the control and / or regulating unit 86a is provided in particular for automatic air flow control and air flow adjustment ( Figure 3 ).

Furthermore, the blower device 14a has a filter element 52a. The filter element 52a is provided for the air flow 50a to flow through. The filter element 52a is formed by a cuboid filter module. The filter element 52a is formed by a particulate filter. The filter element 52a is designed as a depth filter, in particular as a lamella filter. However, it would also be conceivable that the filter element 52a is designed as a gas filter, in particular as an A1 B1 E1 gas filter. The filter element 52a is arranged in the housing unit 58a. A main extension plane 54a of the filter element 52a extends at least substantially parallel to a main extension plane of the housing unit 58a. The filter element 52a is arranged in a lower region of the blower device 14a. The housing unit 58a houses the fan 48a and the filter element 52a. The air inlet opening 78a is arranged on an inlet side of the filter element 52a. Further the filter element 52a is designed to be exchangeable via the cover 74a. A filter exchange module 110a with the filter element 52a is designed to be exchangeable via the cover 74a ( Figure 3 ).

The fan 48a is arranged next to the filter element 52a, the air flow 50a being deflected between the fan 48a and the filter element 52a. The filter element 52a and the fan 48a are arranged jointly in the housing unit 58a. The blower device 14a also has an air guide channel 82a which receives the filter element 52a and which is provided for guiding the air flow 50a between the filter element 52a and the fan 48a. The air duct 82a is formed separately from the housing unit 58a. The housing unit 58a has a receptacle for a defined receptacle for the air guide channel 82a. The air duct 82a is designed to be removable from the housing unit 58a. The air duct 82a can be inserted into the housing unit 58a in a defined position. When the air duct 82a is inserted into the housing unit 58a, the air duct 82a is coupled directly to an inlet duct of the fan 48a. An outlet opening 114a of the air guide channel 82a is sealingly coupled to the inlet channel of the fan 48a. Furthermore, the air duct 82a has an inlet opening 112a and the outlet opening 114a, an opening cross section of the inlet opening 112a being substantially larger than an opening cross section of the outlet opening 114a. An area of the opening cross section of the inlet opening 112a is at least twice as large as an area of the opening cross section of the outlet opening 114a. An area of the opening cross section of the inlet opening 112a is preferably at least 3 times, preferably at least 4 times and particularly preferably at least 5 times as large as an area of the opening cross section of the outlet opening 114a. The area of the opening cross section of the inlet opening 112a corresponds in particular at least approximately to an area of the filter element 52a in the main extension plane 54a of the filter element 52a.

The filter element 52a is firmly integrated into the air duct 82a. The air duct 82a and the filter element 52a form the filter change module 110a. The filter change module 110a is designed to be exchangeable as a whole over the cover 74a. The filter element 52a is at least partially materially connected to the air duct 82a. The filter element 52a is glued into the air duct 82a. The filter element 52a is glued into the air duct in a region of the inlet opening 112a. The air duct 82a forms a filter frame of the filter element 52a. The air guide channel 82a is provided for positioning and stabilizing the filter element 52a. The filter of the filter element 52a is introduced directly into the air duct 82a.

The filter element 52a is fluidically arranged along the air flow 50a in front of the fan 48a. The air flow 50a between the fan 48a and the filter element 52a is deflected by at least approximately 90 °. The air flow 50a is deflected in the air guide channel 82a. A flow direction r _{1 of} the air flow 50a through the filter element 52a is essentially _{different from a flow direction r 2 of} the air flow 50a through the fan 48a. The flow direction r _{2 of} the air flow 50a through the fan 48a runs parallel to the main extension plane 56a of the fan 48a. If the fan 48a is configured as an axial fan, it would also be conceivable that the flow _{direction r 2 of} the air flow 50a through the fan 48a runs perpendicular to the main extension plane 56a of the fan 48a. The flow _{direction r 1 of} the air flow 50a through the filter element 52a runs perpendicular to the main extension plane 54a of the filter element 52a. The direction of flow r _{1 of} the filter element 52a is angled by at least approximately 90 ° with respect to the direction of flow r _{2 of the fan 48a.} The air guide channel 82a is provided for deflecting an air flow 50a between the fan 48a and the filter element 52a. The air duct 82a has a kinked air duct. An inflow direction r _{L1 of} the air flow 50a into the air guide channel 82a is substantially different from an outflow direction r _{L2 of} the air flow 50a from the air guide channel 82a. An angle between the inflow direction r _{L1 of} the air flow 50a into the air duct 82a and the outflow direction r _{L2 of} the air flow 50a out of the air duct 82a is at least approximately 90 ° ( Figure 3 ).

The filter element 52a has the main extension plane 54a. The fan 48a has the main extension plane 56a. It would be conceivable that the main extension plane 54a runs parallel to the main extension plane 56a, a distance between the main extension plane 54a of the filter element 52a and the main extension plane 56a of the fan 48a being less than a maximum thickness of the filter element 52a. In a parallel configuration, a distance between the main extension plane 54a of the filter element 52a and the main extension plane 56a of the fan 48a would preferably be less than 50 mm, preferably less than 30 mm and particularly preferably less than 10 mm. In the embodiment shown, the Main plane of extension 54a of filter element 52a angled relative to main plane of extension 56a of fan 48a. An angle between the main extension plane 54a of the filter element 52a and the main extension plane 56a of the fan 48a is more than 80 °, preferably more than 120 ° and particularly preferably more than 160 °. The angle between the main extension plane 54a of the filter element 52a and the main extension plane 56a of the fan 48a is at least approximately 165 °. A normal vector of the main extension plane 54a of the filter element 52a intersecting the filter element 52a and a normal vector of the main extension plane 56a of the fan 48a intersecting the fan 48a enclose a smallest angle of at least approximately 15 °. The main extension plane 56a of the fan 48a and the main extension plane 54a of the filter element 52a preferably close with an imaginary plane in which the line of intersection between the main extension plane 56a of the fan 48a and the main extension plane 54a of the filter element 52a runs and which is symmetrical between the filter element 52a and the fan 48a is a smallest angle of at least 60 °, preferably at least 70 °. A straight line of intersection of the main extension plane 54a of the filter element 52a and the main extension plane 56a of the fan 48a preferably runs in a vicinity of the filter element 52a and the fan 48a. A smallest distance between the straight line of intersection and the filter element 52a is in particular less than 15 cm, preferably less than 10 cm and particularly preferably less than 5 cm. A smallest distance between the straight line of intersection and the filter element 52a is smaller than a smallest distance between the fan 48a and the filter element 52a. At least a large part of the normal vectors of the main extension plane 54a of the filter element 52a intersecting the filter element 52a is free from an intersection with the fan 48a. All normal vectors of the main extension plane 54a of the filter element 52a intersecting the filter element 52a are free from an intersection with the fan 48a. The filter element 52a and the fan 48a are partially angled next to each other ( Figure 3 ).

Furthermore, the blower device 14a has an energy store 84a. The energy store 84a is formed by an accumulator. The energy store 84a is used to supply energy to the fan 48a. A main plane of extent of the energy store 84a extends at least substantially parallel to one Main plane of extent of the housing unit 58a. The energy store 84a is arranged in a lower region of the blower device 14a. The housing unit 58a accommodates the fan 48a, the filter element 52a and the energy store 84a. The housing unit 58a serves to protect and align the fan 48a, the filter element 52a and the energy store 84a. Furthermore, the energy store 84a is designed to be exchangeable via the cover 76a ( Figure 3 ).

The respiratory protection system 10a also has an external operating unit 62a. The external operating unit 62a is formed by a remote control. The operating unit 62a has operating elements 64a and a control and / or regulating unit 66a, which is provided for controlling and / or regulating the blower device 14a. The external operating unit 62a is, for example, connected to the blower device 14a by means of a cable 88a. The control and / or regulating unit 66a of the external operating unit 62a is provided in particular to control the control and / or regulating unit 86a of the blower device 14a as a function of an input on the operating elements 64a. For example, a power level of the fan 48a can be set via the operating elements 64a. Furthermore, the fan 48a can be activated or deactivated via the operating elements 64a. The external operating unit 62a also has a sensor unit 68a for detecting environmental parameters. The control and / or regulating unit 66a is provided in at least one operating state for controlling and / or regulating the blower device 14a on the basis of the environmental parameters. The control and / or regulating unit 66a is provided during operation to activate the control and / or regulating unit 86a of the fan device 14a, a power level of the fan 48a being adjusted by means of the control and / or regulating unit 86a of the fan device 14a based on the ambient parameters becomes. The sensor unit 68a is provided to detect an air quality, an ambient pressure and / or an oxygen concentration.

Furthermore, the respiratory protection system 10a has a vest 60a to be worn by the user 18a. The vest 60a is formed by a fabric vest. The blower device 14a is arranged on a rear side of the vest 60a. The blower device 14a is detachably connected to the vest 60a. The blower device 14a is worn on the back of the user 18a by means of the vest 60a during operation. Furthermore, the external operating unit 62a is provided by the user 18a to be worn on a chest. The external operating unit 62a is arranged on a front side of the vest 60a. In particular, environmental parameters in a head region of the user 18a can therefore be detected by means of the sensor unit 68a.

The respiratory protection system 10a also has a breathing air line 46a which is connected to the blower device 14a and which is provided for guiding the breathing air flow 26a. The breathing air line 46a connects the blower device 14a to the mouth protection device 12a. The breathing air line 46a is connected to the blower device 14a via the air outlet opening 80a of the blower device 14a. The breathing air line 46a is formed by a hose. The breathing air line 46a is provided in an operation for guiding the breathing air flow 26a.

The mouth protection device 12a has a mask base body 16a. The mask main body 16a is provided to cover a mouth and nose area of the user 18a. Furthermore, the mask base body 16a is provided to at least partially delimit a breathing area 20a. During operation, the mask main body 16a, together with a face of the user 18a and a separating layer 38a, delimits the breathing region 20a. The mask base body 16a consists at least for the most part of a pliable material. The mask base body 16a consists entirely of a pliable material. The mask base body 16a consists entirely of a dimensionally unstable material. The mask base body 16a consists at least to a large extent of a textile material. The mask base body 16a consists entirely of a textile material. The mask base body 16a is made from a textile. The mask base body 16a consists entirely of a textile. The mask base body 16a is designed to be at least substantially airtight. In particular, it would be conceivable for a textile from which the mask base body 16a is made to have a coating which at least reduces air permeability. The mask base body 16a is airtight in particular at least at an absolute pressure of 1 bar, preferably at least 2 bar and particularly preferably at least 3 bar ( Figure 4 ).

The mouth protection device 12a also has a sealing element 90a. The sealing element 90a is firmly connected to the mask base body 16a. The sealing element 90a is arranged on an upper edge of the mask base body 16a. The sealing element 90a is provided to seal the mask base body 16a at least on an upper edge of the mask base body 16a against a face of the user 18a. The sealing element 90a is provided to seal off a breathing area 20a and an outlet area 40a in the direction of the eyes of the user 18a in order to avoid an air flow into the eyes of the user 18a. The sealing element 90a consists of a foam. The sealing element 90a is formed by a foam strip. The sealing element 90a is, for example, glued to the mask base body 16a ( Figure 6 ).

The mouth protection device 12a also has a breathing air supply line 22a connected to the mask base body 16a. The breathing air supply line 22a delimits a breathing air channel 24a which opens into the breathing area 20a and is provided for guiding the active breathing air flow 26a. The breathing air supply line 22a is formed by an elastic hose. The breathing air supply line 22a has, for example, an oval cross section. However, another cross-section of the breathing air supply line 22a that appears sensible to a person skilled in the art would also be conceivable, such as a circular cross-section, for example. The breathing air supply line 22a extends from the breathing air line 46a to the breathing region 20a.

Furthermore, the mouth protection device 12a has a further breathing air supply line 22'a which is redundant to the breathing air supply line 22a and is connected to the mask base body 16a. The further breathing air supply line 22'a delimits a further breathing air channel which opens into the breathing region 20a and is provided for guiding the active breathing air flow 26a. The further breathing air supply line 22'a is formed by an elastic hose. The further breathing air supply line 22'a has, for example, an oval cross section. The further breathing air supply line 22'a extends from the breathing air line 46a to the breathing region 20a. The further breathing air supply line 22'a is arranged on a side of the mask base body 16a facing away from the breathing air supply line 22a. The breathing air supply lines 22a, 22'a are provided to be led past on different sides of a head 30a of the user 18a. The further breathing air supply line 22'a has a function that is redundant to the breathing air supply line 22a. The further breathing air supply line 22'a serves to increase the reliability of a supply with the breathing air flow 26a. The Breathing air supply line 22a and the further breathing air supply line 22'a are each functional independently of one another.

The breathing air line 46a connected to the blower device 14a is provided for guiding the breathing air flow 26a to the breathing air supply lines 22a, 22'a. The breathing air line 46a is also provided to divide the breathing air flow 26a between the breathing air supply line 22a and the further breathing air supply line 22'a. The breathing air line 46a is coupled to the breathing air supply line 22a and the further breathing air supply line 22'a via a T-connector 108a. The T-connection piece 108a is intended to be arranged in a neck region of the user 18a.

The mouth protection device 12a also has a fastening strap 28a for fixing the mask base body 16a to the head 30a of the user 18a. The fastening band 28a is formed by an elastic band, such as in particular a rubber band. The fastening strap 28a has a width which at least approximately corresponds to a width of the breathing air supply line 22a. Furthermore, an effective length of the fastening band 28a is designed to be adjustable. The fastening strap 28a extends from a first end of the mask main body 16a to an opposite second end of the mask main body 16a. The fastening strap 28a extends from a first end of the mask base body 16a, at which the breathing air supply line 22a is connected to the mask base body 16a, to an opposite second end of the mask base body 16a, at which the further breathing air supply line 22'a is connected to the mask base body 16a. When the mouthguard device 12a is in a worn state, the fastening strap 28a is provided to be guided around the back of the head, in particular in a neck area. The mouth protection device 12a has at least one connection unit 32a for a simultaneous plug connection of the fastening strap 28a and the at least one breathing air supply line 22a, 22'a with the mask base body 16a. The mouth protection device 12a has the connection unit 32a and a further connection unit (not further visible) for a simultaneous plug connection of the fastening strap 28a with the respiratory air supply line 22a and the further respiratory air supply unit 22'a with the mask base body 16a. The Connection units 32a serve to pull off or pull out the mouth protection device 12a. The connection units 32a are coupled, for example, by means of a plugging movement. The connection units 32a each have a first coupling element 92a and a second coupling element 94a corresponding to the first coupling element 92a. The first coupling elements 92a of the connection units 32a each form, for example, an interface receptacle, while the second coupling elements 94a of the connection units 32a each form an interface extension. The first coupling elements 92a of the connection units 32a are each firmly connected to the mask base body 16a at opposite ends. The second coupling element 94a of the connection unit 32a is fixed to a first end of the fastening strap 28a and the breathing air supply line 22a. The further, second coupling element 94a of the further connection unit is designed to be fixed with a second end of the fastening strap 28a and the further breathing air supply line 22'a. The first coupling elements 92a of the connection units 32a are each formed by a hose connector. The first coupling elements 92a of the connection units 32a are each provided to latch with the second coupling elements 94a of the connection units 32a. The second coupling elements 94a of the connection units 32a each have actuating elements 96a for releasing the latching connection ( Figure 1 , 5 ).

The mouth protection device 12a has a head fastening strap 98a for an additional fixation of the mask main body 16a on the head 30a of the user 18a. Further, an effective length of the head tether 98a is made adjustable. The head fastening strap 98a extends from a first end of the mask main body 16a to an opposite second end of the mask main body 16a. The head fastening strap 98a extends from a first end of the mask base body 16a, at which the breathing air supply line 22a is connected to the mask base body 16a, to an opposite second end of the mask base body 16a, at which the further breathing air supply line 22'a is connected to the mask base body 16a. When the mouthguard device 12a is in a worn state, the head fastening band 98a is provided to be guided around the back of the head, in particular an upper head. The mouth protection device 12a has a fastening unit 100a and a further fastening unit 100'a for an adjustable fastening of the head fastening strap 98a at the ends with the mask base body 16a. The head fastening strap 98a is adjustably guided on the fastening units 100a, 100'a through recesses for fastening.

The mouth guard device 12a also has an adjustment unit 34a, by means of which at least one effective length of a side edge 36a of the mask base body 16a is at least partially adjustable. By means of the setting unit 34a, an effective length of the side edge 36a from the first end, at which the first coupling element 92a is arranged, to the second end, at which the further first coupling element is arranged, of the mask base body 16a is adjustable. The side edge 36a runs essentially parallel to a main direction of extent of the mask base body 16a. The adjustment unit 34a comprises a cord 102a, in particular an elastic cord, and a cord clamp 104a. The cord 102a of the adjustment unit 34a extends in a channel of the mask main body 16a from the first end of the mask main body 16a to the second end of the mask main body 16a opposite the first end. The cord 102a is attached to the first end and the second end. By means of the cord clamp 104a, an effective length of the cord 102a and thus also the side edge 36a of the mask base body 16a is designed to be manually adjustable. In particular, by forming loops of different sizes in the cord 102a by means of the cord clamp 104a, an effective length of the cord 102a is designed to be manually adjustable.

Furthermore, the mouth protection device 12a has the separating layer 38a which is connected to the mask base body 16a and which is provided for at least partial separation of the breathing region 20a from the outlet region 40a. The outlet region 40a is at least partially delimited by the mask base body 16a. The outlet area 40a is arranged below the breathing area 20a. In an operating state, the mask base body 16a, together with the face of the user 18a, delimits a spatial area which is divided into a breathing area 20a and an outlet area 40a by means of the separating layer 38a. The separating layer 38a, together with the mask base body 16a, forms a channel which at least partially forms the breathing region 20a and which extends as far as a central region of the mouth protection device 12a extends. The channel formed by the separating layer 38a extends from the breathing air channel 24a and the further breathing air channel to a mouth and / or nose part of the user 18a. In the mouth and / or nose area of the user 18a, the breathing area 20a merges into the outlet area 40a. The separating layer 38a is formed in one piece with the mask base body 16a. The separating layer 38a protrudes perpendicular to the mask main body 16a between the breathing area 20a and the outlet area 40a. The separating layer 38a has a cutout 106a in a central region, which connects the breathing region 20a to the outlet region 40a. The separating layer 38a consists at least essentially of a textile material. The separating layer 38a consists entirely of a textile. The separating layer 38a is provided for a defined air flow. The separating layer 38a is provided to guide the breathing air flow 26a past the mouth and / or nose area of the user 18a before it reaches the outlet region 40a. For this purpose, the separating layer 38a has the recess 106a in the central region, which connects the breathing region 20a to the outlet region 40a. During operation, the breathing air flow 26a flows from the breathing air channel 24a and the further breathing air channel into the breathing area 20a and from there through the recess 106a into the outlet area 40a. The recess 106a is arranged in the vicinity of the mouth and / or nose area of the user 18a ( Figure 6 ).

In addition, the mouth protection device 12a has a discharge valve 42a, which is provided to regulate a pressure in the breathing region 20a to an at least approximately constant value. The discharge valve 42a is formed by an overpressure valve, in particular a one-way overpressure valve, which is provided to open from a defined overpressure in the breathing area 20a or the outlet area 40a with respect to an environment. The discharge valve 42a is provided to allow, in particular to maintain, a defined overpressure in the breathing region 20a. The discharge valve 42a is preferably formed by a mechanical valve. The mask main body 16a is not completely sealed off from a face of the user 18a, so that, in addition to the discharge valve 42a, air can also escape at a transition from the mask main body 16a to the face. If the leakage is too great or if the mouth protection device 12a is removed at the transition from the mask base body 16a to the face, the pressure in the breathing region 20a can no longer be maintained and the pressure falls below the limit value of the Drain valve 42a. This can be detected by means of the blower device 14a, in particular on the basis of a load on the fan 48a, and a warning signal can optionally be output to the user 18a. In this way, the user 18a can be automatically informed that the mouth protection device 12a is being worn incorrectly. Furthermore, the fan 48a can automatically stop when the mouthguard device 12a is put on. Under regular conditions, the pressure in the breathing area 20a is regulated to an approximately constant value by means of the discharge valve 42a ( Figure 4 ).

Furthermore, it is also conceivable that the mask base body 16a has a partial area 44a which is designed to be air-permeable. The sub-area 44a is made in particular from an air-permeable textile. The sub-area 44a directly adjoins the outlet area 40a. The sub-area 44a is used for a defined discharge of air in the outlet area 40a. The sub-area 44a is provided in addition to the drain valve 42a, but it would also be conceivable that only the sub-area 44a is provided and the sub-area 44a takes over the function of the drain valve 42a.

In the Figure 7 a further embodiment of the invention is shown. The following descriptions are essentially limited to the differences between the exemplary embodiments, with reference to the description of the exemplary embodiment in relation to components, features and functions that remain the same Figures 1 to 6 can be referenced. To differentiate the exemplary embodiments, the letter a is in the reference numerals of the exemplary embodiment in FIG Figures 1 to 6 by the letter b in the reference numerals of the embodiment of Figure 7 replaced. With regard to components with the same designation, in particular with regard to components with the same reference numerals, the drawings and / or the description of the exemplary embodiment of FIG Figures 1 to 6 to get expelled.

Figure 7 shows a blower device 14b of a respiratory protection system. The blower device 14b is provided for generating a breathing air flow 26b. The blower device 14b is provided for generating a breathing air flow 26b for a mouth protection device.

The blower device 14b has a housing unit 58b. The housing unit 58b is formed by a plastic housing. The housing unit 58b has two interconnected housing shells 70b, 72b, namely a first housing shell 70b and a second housing shell 72b. The housing unit 58b has a thickness of less than 70 mm.

Furthermore, the blower device 14b has a fan 48b for generating an air flow 50b. The blower device 14b is provided for generating an overpressure in the mouth protection device 12b. The fan 48b is provided to generate an overpressure in the mouth protection device 12b. The fan 48b is formed by an electric radial fan.

Furthermore, the blower device 14b has a filter element 52b. The filter element 52b is provided for the air flow 50b to flow through. The filter element 52b is formed by a cuboid filter module. The filter element 52b is formed by a particulate filter. The filter element 52b is designed as a depth filter, in particular as a lamella filter. A main extension plane 54b of the filter element 52b extends at least substantially parallel to a main extension plane of the housing unit 58b. The filter element 52b is arranged in a lower region of the blower device 14b. The housing unit 58b houses the fan 48b and the filter element 52b.

Furthermore, the blower device 14b has a further filter element 52'b. The further filter element 52'b is provided for the air flow 50b to flow through. The further filter element 52'b is provided for the air flow 50b to flow through in front of the filter element 52b. The further filter element 52'b is formed by a cuboid filter module. The further filter element 52'b is formed by an activated charcoal odor filter. A main extension plane 54'b of the further filter element 52'b extends at least substantially parallel to a main extension plane of the housing unit 58b. The further filter element 52'b is arranged in a lower region of the blower device 14b. The housing unit 58b accommodates the fan 48b, the filter element 52b and the further filter element 52'b. Air inlet openings 78b are arranged on an inlet side of the further filter element 52'b. The further filter element 52'b is arranged on an input side of the filter element 52b.

The fan 48b is arranged next to the filter element 52b, the air flow 50b being deflected between the fan 48b and the filter element 52b. The other Filter element 52'b is also arranged next to fan 48b. The filter element 52b, the further filter element 52'b and the fan 48b are arranged together in the housing unit 58b.

The blower device 14b also has an air guide channel 82b which receives the filter element 52b and which is provided for guiding the air flow 50b between the filter element 52b and the fan 48b. The air duct 82b is formed separately from the housing unit 58b. The housing unit 58b has a receptacle for a defined receptacle for the air guide channel 82b. The air duct 82b is designed to be removable from the housing unit 58b. The air duct 82b can be inserted into the housing unit 58b in a defined position. When the air duct 82b is inserted into the housing unit 58b, the air duct 82b is coupled directly to an inlet duct of the fan 48b. An outlet opening 114b of the air guide channel 82b is sealingly coupled to the inlet channel of the fan 48.

The filter element 52b is firmly integrated in the air duct 82b. The further filter element 52'b is firmly integrated into the air duct 82b. The air duct 82b, the filter element 52b and the further filter element 52'b form a filter change module 110b. The filter change module 110b is designed to be exchangeable as a whole over the cover 74b. The filter element 52b and the further filter element 52'b are at least partially materially connected to the air duct 82b. The filter element 52b and the further filter element 52'b are glued into the air duct 82b. The filter element 52b and the further filter element 52'b are glued into the air duct 82b in a region of an inlet opening 112b. The air duct 82b forms a filter frame of the filter element 52b and of the further filter element 52'b. The filter element 52b and the further filter element 52'b are arranged in a stack. The filter element 52b is fluidically arranged along the air flow 50b in front of the fan 48b. The further filter element 52'b is fluidically arranged along the air flow 50b in front of the filter element 52b. The air flow 50b between the fan 48b and the filter element 52b is deflected by at least approximately 90 °. The air flow 50b is deflected in the air guide channel 82b. A flow direction r _{1 of} the air flow 50b through the filter element 52b is essentially _{different from a flow direction r 2 of} the air flow 50b through the fan 48b. A flow _{direction r 3 of} the air flow 50b through the further filter element 52'b is essentially of one The flow direction r _{2 of} the air flow 50b through the fan 48b is different. The flow _{direction r 3 of} the air flow 50b through the further filter element 52'b essentially corresponds to the flow direction r _{1 of} the air flow 50b through the filter element 52b. The flow direction r _{2 of} the air flow 50b through the fan 48b runs parallel to a main extension plane 56b of the fan 48b. The flow _{direction r 1 of} the air flow 50b through the filter element 52b runs perpendicular to the main extension plane 54b of the filter element 52b. The flow _{direction r 3 of} the air flow 50b through the further filter element 52'b runs perpendicular to the main extension plane 54'b of the further filter element 52'b. The direction of flow r _{1 of} the filter element 52b and the _{direction of flow r 3 of} the further filter element 52'b are angled by at least approximately 90 ° with respect to the direction of flow r _{2 of the fan 48b.} The air guide channel 82b is provided to deflect the air flow 50b between the fan 48b and the filter element 52b. The air duct 82b has a kinked air duct. An inflow direction r _{L1 of} the air flow 50b into the air guide channel 82b is substantially different from an outflow direction r _{L2 of} the air flow 50b from the air guide channel 82b. An angle between the inflow direction r _{L1 of} the air flow 50b into the air guide channel 82b and the outflow direction r _{L2 of} the air flow 50b from the air guide channel 82b is at least approximately 90 °.

Reference number

10

Respiratory protection system

12th

Mouth guard

14th

Blower device

16

Mask body

18th

user

20th

Breathing area

22nd

Breathing air supply line

22 '

Breathing air supply line

24

Breathing air duct

26th

Breathing air flow

28

Fastening tape

30th

head

32

Connection unit

34

Setting unit

36

Side edge

38

Separating layer

40

Outlet area

42

Drain valve

44

Sub-area

46

Breathing air line

48

Fan

50

Airflow

52

Filter element

52 '

Filter element

54

Main plane of extent

54 '

Main plane of extent

56

Main plane of extent

58

Housing unit

60

vest

62

Control unit

64

Control element

66

Control and / or regulating unit

68

Sensor unit

70

Housing shell

72

Housing shell

74

cover

76

cover

78

Air inlet opening

80

Air outlet opening

82

Air duct

84

Energy storage

86

Control and / or regulating unit

88

electric wire

90

Sealing element

92

Coupling element

94

Coupling element

96

Actuator

98

Head strap

100

Fastening unit

100 '

Fastening unit

102

cord

104

Cord clamp

106

Recess

108

T-connector

110

Filter change module

112

Inlet opening

114

Outlet opening

d

thickness

r1

Flow direction

r2

Flow direction

r3

Flow direction

rL1

Direction of flow

rL2

Outflow direction

Claims (13)

Blower device for a respiratory protection system (10a), with a fan (48a; 48b) for generating an air flow (50a; 50b), with at least one filter element (52a; 52b), which is provided to remove from the air flow (50a; 50b) to be flowed through, with a housing unit (58a; 58b) accommodating the fan (48a; 48b) and the at least one filter element (52a; 52b) and with an air duct (82a; 82b) accommodating the filter element (52a; 52b), which to a guide for the air flow (50a; 50b) is provided between the filter element (52a; 52b) and the fan (48a; 48b), characterized in that the air duct (82a; 82b) is formed separately from the housing unit (58a; 58b) and the at least one filter element (52a; 52b) is firmly integrated in the air duct (82a; 82b). Blower device according to claim 1, characterized in that the air duct (82a) and the at least one filter element (52a) form a filter change module (110a). Blower device according to claim 1 or 2, characterized in that the at least one filter element (52a; 52b) is at least partially materially connected to the air duct (82a; 82b). Blower device according to one of the preceding claims, characterized in that the air duct (82a; 82b) forms a filter frame of the at least one filter element (52a; 52b). Blower device according to one of the preceding claims, characterized in that the air duct (82a; 82b) is provided to deflect an air flow (50a; 50b) between the fan (48a; 48b) and the filter element (52a; 52b). Blower device according to one of the preceding claims, characterized in that an inflow direction (r _L1 ) of the air flow (50a; 50b) into the air guide channel (82a; 82b) is substantially different from an outflow direction (r _L2 ) of the air flow (50a; 50b) from the air guide channel (82a; 82b). Blower device according to one of the preceding claims, characterized in that the air duct (82a; 82b) has an inlet opening (112a; 112b) and an outlet opening (114a; 114b), an opening cross section of the inlet opening (112a; 112b) being substantially larger than an opening cross section of the outlet opening (114a; 114b). Blower device according to one of the preceding claims, marked by a further filter element (52'b) which is integrated next to the fan (48b) and which is firmly integrated in the air duct (82a; 82b). Blower device according to claim 8, characterized in that the air duct (82b), the filter element (52b) and the further filter element (52'b) form a filter change module (110b), in particular an alternative filter change module. Blower device according to one of the preceding claims, characterized in that the housing unit (58a; 58b) has a thickness (d) of less than 70 mm. Blower device according to one of the preceding claims, characterized in that the fan (48a; 48b) is provided for generating a volume flow of the air flow (50a; 50b) of at least 50 l / min and a maximum of 250 l / min. Breathing protection system, in particular a blower breathing protection system, with a blower device (14a; 14b) according to one of the preceding claims and with at least one face mask (12a). Respiratory protection system according to claim 12, characterized in that the at least one blower device (14a; 14b) is provided for generating an overpressure in the mouth protection device (12a).

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