BLOWER DEVICE FOR A RESPIRATORY PROTECTION SYSTEM

Description

State of the art

[0001] The invention relates to a blower device for a respiratory protection system, comprising at least one ventilation unit which is provided for supplying air to a breathing mask unit, and comprising a transfer unit for transferring air from the ventilation unit to the breathing mask unit according to the preamble of claim 1.

[0002] Such a breathing mask unit is known, for example, from WO 98 / 41306 A1. The object of the invention is, in particular, to provide a generic device with improved mobility properties. This object is achieved according to the invention by the features of patent claim 1, while advantageous embodiments and further developments of the invention can be found in the subclaims. Advantages of the invention

[0003] The invention relates to a blower device for a respiratory protection system, comprising at least one ventilation unit which is provided for supplying air to a breathing mask unit, and comprising a transfer unit for transferring air from the ventilation unit to the breathing mask unit.

[0004] It is proposed that the blower device has a connecting unit which is mounted at least partially movably on the ventilation unit and which connects the transfer unit to the ventilation unit, in particular at least substantially airtight, and which is arranged at least partially in the ventilation unit.

[0005] In this context, a "blower device" is understood to mean, in particular, a device that is intended to actively generate an air flow to a user's breathing air supply. The blower device is, in particular, formed by a compact blower device. The blower device is, in particular, intended to be worn on the body, such as on the back and / or on the hip. During operation, the blower device is, in particular, intended to supply the air flow to the breathing mask unit of the respiratory protection system. Preferably, during operation, the blower device is intended to draw in air from an environment, purify the air, in particular, filter it, and actively supply the purified air to a user via the transfer unit, in particular, via the breathing mask unit.The ventilation unit is preferably connected to the breathing mask unit of the respiratory protection system via the at least one transfer unit. The transfer unit is preferably designed as a breathing air supply line, such as a hose, preferably a bellows hose. The ventilation unit is preferably provided for generating an active air flow. The ventilation unit is particularly provided for generating an overpressure air flow. The ventilation unit has, in particular, a fan for actively generating the air flow. During operation, the fan is particularly provided for actively generating the air flow. The fan is particularly provided for actively sucking in air from an environment and actively transporting the air to the breathing mask unit of the respiratory protection system. The fan is particularly formed by an axial fan and / or radial fan."Intended" should be understood in particular to mean specifically programmed, designed, and / or equipped. The fact that an object is intended for a specific function should be understood in particular to mean that the object fulfills and / or performs this specific function in at least one application and / or operating state.

[0006] The ventilation unit has a ventilation housing.

[0007] The connecting unit is preferably designed as an adapter unit for connecting the transfer unit to the ventilation housing. The connecting unit is preferably designed as a hose-to-housing adapter. The connecting unit is preferably fixedly connected to the transfer unit, in particular immovably, preferably inseparably. The connecting unit can be formed integrally with the transfer unit. The connecting unit preferably connects the transfer unit, designed as a breathing air supply line, to the ventilation housing, preferably in an at least substantially airtight manner.The term "the connecting unit connects the transfer unit to the ventilation unit at least substantially airtight" is to be understood in particular to mean that the air flow between the ventilation unit and the transfer unit is enabled by the connection, wherein the connecting unit prevents air exchange between ambient air arranged outside the transfer unit and outside the ventilation unit and the air flow. In particular, the air flow defines a defined air flow axis, which is defined in particular by an orientation of the fan. Preferably, the air flow axis is aligned from the fan to the transfer unit, in particular to the connecting unit. Preferably, a longitudinal axis of the connecting unit is aligned at least substantially parallel to the air flow axis.A "longitudinal axis of an object or unit" should preferably be understood as an axis that runs parallel to the longest outer edge of the smallest imaginary cuboid that just completely encloses the object or unit. At least "essentially parallel" is understood here to mean, in particular, an orientation of a direction relative to a reference direction, in particular in a plane, wherein the direction has a deviation from the reference direction of, in particular, less than 8°, advantageously less than 5°, and particularly advantageously less than 2°.At least "substantially perpendicular" is to be understood in particular as an orientation of a direction relative to a reference direction, wherein the direction and the reference direction, in particular viewed in a plane, enclose an angle of 90° and the angle has a maximum deviation of in particular less than 8°, advantageously less than 5° and particularly advantageously less than 2°.

[0008] The connecting unit is mounted at least partially movably on the ventilation housing. The term "the connecting unit is mounted at least partially movably on the ventilation unit, in particular on the ventilation housing," should be understood in particular to mean that the connecting unit is mounted on the ventilation unit, in particular on the ventilation housing, so as to be rotatable about the airflow axis. The connecting unit is mounted immovably, in particular, at least substantially parallel to the airflow direction, with a deviation of a maximum of 2 mm, preferably a maximum of 1 mm, and the connecting unit is mounted immovably, in particular, at least substantially perpendicular to the airflow direction, with a deviation of a maximum of 2 mm, preferably a maximum of 1 mm.

[0009] The phrase "the connecting unit is arranged at least partially in the ventilation unit" should be understood to mean, in particular, that the connecting unit is arranged at least partially in the ventilation housing. According to the invention, the ventilation housing has a connection interface through which the at least one connecting unit can be arranged at least partially in the ventilation housing.

[0010] The inventive design of the blower device allows for an advantageously movable connection between the transfer unit and the ventilation unit. In particular, an advantageously robust connection between the transfer unit and the ventilation unit can be provided. In particular, an advantageously compact connection between the transfer unit and the ventilation unit can be provided.

[0011] Furthermore, it is proposed that the connecting unit be detachably connected to the ventilation unit. Preferably, the connecting unit is detachably connected to the ventilation housing. Preferably, the connecting unit is designed to be at least partially inserted into the connecting housing. Preferably, the connecting unit is detachably connected to the ventilation unit in the ventilation housing. This allows for advantageous detachability of the connection between the transfer unit and the ventilation unit, in particular the ventilation housing.

[0012] It is further proposed that the connecting unit be mounted on the ventilation unit, in particular on the ventilation housing, so as to be at least partially rotatable about an air flow axis of the connecting unit, in particular the one already mentioned. Preferably, rotation of the connecting unit about the air flow axis of the connecting unit is limited by an elasticity of the transfer unit. The rotation of the connecting unit about the air flow axis of the connecting unit can alternatively or additionally be limited by the ventilation unit, in particular the fixing plate and / or the ventilation housing, and / or the connecting unit. Preferably, rotation of the connecting unit about the air flow axis of the connecting unit is limited to a rotation angle of a maximum of 270°, preferably a maximum of 180°, particularly preferably a maximum of 120°, and most particularly preferably a maximum of 90°.This allows for a connection of the transfer unit to the ventilation unit that advantageously follows a user's movement. In particular, a connection unit, in particular a transfer unit, that is advantageously robust can be achieved. In particular, a connection between the transfer unit and the ventilation unit that is advantageously durable and particularly robust can be achieved.

[0013] Furthermore, it is proposed that the at least one connecting unit be permanently connected to the at least one ventilation unit. The connecting unit can be permanently connected to the ventilation housing. In particular, the connecting unit can be rotatably and permanently connected to the ventilation housing, preferably about the air flow axis. In particular, a fixing element of the ventilation unit can be permanently connected to the ventilation housing for fixing the connecting unit to the ventilation unit. This allows an advantageously robust connection of the connecting unit to the ventilation unit, preferably in the ventilation housing.

[0014] It is further proposed that the ventilation unit have a displaceable fixing element by means of which the at least one connecting unit can be at least partially fixed in the ventilation unit. According to the invention, the ventilation unit comprises a fixing element, preferably a fixing plate, which is provided in particular for fixing the connecting unit to the ventilation housing. According to the invention, the fixing element, preferably the fixing plate, is preferably provided for displaceability in the ventilation housing. Preferably, the fixing element, preferably the fixing plate, is provided for partially encompassing the connecting unit. Preferably, the fixing element, preferably the fixing plate, is provided for detachably connecting the connecting unit to the ventilation housing, in particular by displacing the fixing plate.In particular, the connecting unit can be connected to the ventilation housing by the fixing element, preferably the fixing plate, preferably by sliding the fixing plate. The fixing element, preferably the fixing plate, can be designed as a locking plate, in particular for a locking connection with the connecting unit. Preferably, when the connecting unit is partially gripped, the fixing element, preferably the fixing plate, blocks movement of the connecting unit at least substantially parallel to the air flow axis, in particular at least up to a deviation of a maximum of 2 mm, preferably a maximum of 1 mm. Preferably, the connecting unit is designed to be at least partially inserted into the connecting housing. An advantageously uncomplicated and stable connection of the connecting unit to the connecting housing can be achieved.In particular, an advantageously uncomplicated release and / or establishment of the connection of the connecting unit with the connecting housing can be achieved.

[0015] It is further proposed that the connecting unit have a locking groove for at least partially receiving the at least one fixing element. Preferably, the at least one locking groove is arranged on an outer side of the connecting unit. Preferably, the at least one locking groove is arranged on a side of the connecting unit facing the ventilation unit, in particular along the air flow axis. Preferably, the at least one locking groove extends in a plane perpendicular to the air flow axis around the entire circumference of the connecting unit. In particular, the locking groove is provided to at least partially receive the at least one fixing element, preferably a rounded outer edge of the at least one fixing element, in particular at least substantially completely.An advantageous interlocking of the connecting unit and the ventilation unit can be achieved to advantageously securely fix the connecting unit to the ventilation unit.

[0016] It is further proposed that the at least one connecting unit has at least one valve element for air flow regulation. The at least one valve element is preferably arranged in an interior of the connecting unit. The at least one valve element is preferably arranged detachably, in particular replaceably, in the interior of the connecting unit. The valve element can comprise a filter element. The valve element is preferably designed as a return valve element. The valve element can be provided, in particular, to direct the air flow to the breathing mask unit into a partial air duct of the transfer unit. For example, the transfer unit can have two partial ducts, one each for transporting air to the breathing mask unit and one for transporting air away from the breathing mask unit to an air outlet, which is arranged, in particular, at an end of the transfer unit facing the ventilation unit.A beneficially directed airflow can be achieved. In particular, the risk of low-oxygen air returning to the ventilation unit can be advantageously reduced. A favorable safety standard can be achieved.

[0017] Furthermore, it is proposed that the ventilation unit aVentilation housing and a connection interface to a receptacle for the at least one connection unit, and the connection interface is formed integrally with the ventilation housing. "Integral" is to be understood in particular as being at least materially connected, for example by a welding process, an adhesive process, an injection molding process, and / or another process deemed appropriate by a person skilled in the art, and / or advantageously formed in one piece, such as by production from a single casting and / or by production using a single- or multi-component injection molding process, and advantageously from a single blank. An advantageously stable connection unit can be achieved. Furthermore, a transfer unit is proposed with a connection unit, wherein the connection unit and the transfer unit are formed integrally.The transfer unit is preferably designed as a flexible air hose, in particular as a bellows air hose. Particularly preferably, the transfer unit is formed at least partially from a synthetic or natural elastomer. In particular, the air conduction length of the transfer unit is variable, in particular by at least 10% of the air conduction length in a force-free state of the transfer unit. This allows the transfer unit to be advantageously combined with the ventilation unit and / or the breathing mask unit.

[0018] Furthermore, a respiratory protection system is proposed with at least one breathing mask unit, in particular the one already mentioned, and with a blower device according to one of the preceding claims. Preferably, the breathing mask unit is detachably or permanently connected to the transfer unit for air conduction. The respiratory protection system can comprise an operating unit. The respiratory protection system can comprise a vest. This allows for advantageous combinability of the transfer unit with the breathing mask unit.

[0019] The blower device according to the invention, the transfer unit according to the invention, and / or the respiratory protection system according to the invention are not intended to be limited to the application and embodiment described above. In particular, the blower device according to the invention, the transfer unit according to the invention, and / or the respiratory protection system according to the invention can have a number of individual elements, components, and units that differs from the number stated herein in order to fulfill a function described herein. Drawings

[0020] Further advantages will become apparent from the following description of the drawings. The drawings illustrate an exemplary embodiment of the invention. The drawings, the description, and the claims contain numerous features in combination. Those skilled in the art will also expediently consider the features individually and combine them into useful further combinations.

[0021] They show: Fig. 1 shows a respiratory protection system with a blower device according to the invention, with a breathing mask unit, with a vest and with an external control unit and a user in a schematic representation, Fig. 2 shows the blower device according to the invention of the respiratory protection system in a schematic sectional representation along the section line II-II and Fig. 3 shows a fixing element of a ventilation unit of the blower device according to the invention in a schematic representation. Description of the embodiment

[0022] The Figure 1shows a respiratory protection system 50. The respiratory protection system 50 is formed by a blower respiratory protection system. The respiratory protection system 50 is formed, in particular, by a blower respiratory protection system of safety class TH3. The respiratory protection system 50 is intended to protect a user 48 from particles such as smoke, aerosols, and / or dust. Furthermore, the respiratory protection system 50 can additionally protect against unpleasant odors and harmful ozone. In particular, it is conceivable that the respiratory protection system 50 protects the user 48 from organic, inorganic, and / or acidic gases in environments with harmful or even toxic gases. The respiratory protection system 50 comprises a blower device 10. The blower device 10 is provided for the respiratory protection system 50. The respiratory protection system 50 has a breathing mask unit 12. The blower device 10 has a ventilation unit 14. The blower device 10 has a transfer unit 16.The blower device 10 has a connecting unit 44. The connecting unit 44 is provided for connecting the transfer unit 16 to the ventilation unit 14.

[0023] The ventilation unit 14 is provided for generating an air flow 54. The ventilation unit 14 is provided for generating the air flow 54 for the breathing mask unit 12. The ventilation unit 14 has a fan 56 for generating the air flow 54. The ventilation unit 14 is provided for supplying air to the breathing mask unit 12.

[0024] The transfer unit 16 is partially designed as a flexible air hose. The transfer unit 16 is intended for air transfer from the ventilation unit 14 to the breathing mask unit 12. The transfer unit 16 includes a Y-mask coupling air hose 38. The transfer unit 16 includes a ventilation coupling air hose 40. The Y-mask coupling air hose 38 is less flexible than the ventilation coupling air hose 40. The ventilation coupling air hose 40 is designed as a bellows hose.

[0025] The breathing mask unit 12 has a mask body 30. The mask body 30 is designed to cover a mouth and nose area of ​​the user 48. Furthermore, the mask body 30 is designed to at least partially define a breathing area 32.

[0026] The breathing mask unit 12 further comprises two fastening straps 34, 34' for securing the mask base body 30 to a head 52 of the user 48. The fastening straps 34, 34' are formed from an elastic band, such as a rubber band, in particular. When the breathing mask unit 12 is worn, the fastening strap 34 is designed to be guided around a crown, in particular over the head 52. When the breathing mask unit 12 is worn, the fastening strap 34' is designed to be guided around the back of the head, in particular in the neck area.

[0027] Furthermore, the breathing mask unit 12, in particular the mask base body 30, is connected to the transfer unit 16. The breathing mask unit 12, in particular the mask base body 30, is connected to the transfer unit 16 via two snap buckles 36. The mask base body 30 is connected to the Y-mask coupling air hose 38 via the snap buckles 36. The connection between the mask base body 30 and the Y-mask coupling air hose 38 is airtight to the ambient air. The Y-mask coupling air hose 38 is connected to the fastening strap 34' for stabilization in the neck area.

[0028] The Y-mask coupling air hose 38 is permanently connected to the ventilation coupling air hose 40. In particular, the Y-mask coupling air hose 38 has a Y-end piece 42. Alternatively, the Y-mask coupling air hose 38 could also have a T-end piece instead of the Y-end piece 42.

[0029] The ventilation coupling air hose 40 connects the transfer unit 16 to the connecting unit 44 in an air-conducting manner. The connecting unit 44 connects the transfer unit 16 to the ventilation unit 14 in an air-conducting manner. The connecting unit 44 connects the ventilation coupling air hose 40 to the ventilation unit 14 in an air-conducting manner. The air flow 54 is guided from the ventilation unit 14 through the connecting unit 44 and through the transfer unit 16 to the breathing mask unit 12. The connecting unit 44 and the transfer unit 16 are formed as a single piece. The ventilation coupling air hose 40 is formed as a single piece with the connecting unit 44.

[0030] The ventilation unit 14 has a ventilation housing 18. Figure 2shows, in particular, an interior of the ventilation housing 18. The ventilation housing 18 is made of plastic. The ventilation housing 18 has two interconnected housing shells, namely a first housing shell and a second housing shell. A curvature of the ventilation housing 18 is adapted to the curvature of a person's back. The ventilation housing 18 has a thickness d of less than 70 mm. The ventilation housing 18 has a thickness d of less than 50 mm. Furthermore, the ventilation housing 18 has a plurality of air inlet openings. The air inlet openings are formed by slots in one of the housing shells. During operation, the air inlet openings serve to draw in ambient air by means of an intake air flow, in particular through the fan 56.

[0031] The fan 56 is arranged in the ventilation housing 18. The ventilation unit 14 is provided for generating an overpressure in the breathing mask unit 12. The fan 56 is provided for generating the overpressure in the breathing mask unit 12. The fan 56 is provided for generating a volume flow of the air flow 54 of at least 50 l / min and a maximum of 250 l / min. The fan 56 is provided for generating a volume flow of the air flow 54 of at least 80 l / min and a maximum of 120 l / min. During operation, the ventilation unit 14, by means of the fan 56, is provided for generating a relative overpressure compared to the surroundings in the breathing mask unit 12. The fan 56 is formed by an electric radial fan. In principle, however, another design that would appear appropriate to a person skilled in the art would also be conceivable. The fan 56 is arranged on an outlet side of the ventilation housing 18.An air outlet opening 58 is arranged on the output side of the ventilation housing 18.

[0032] The ventilation unit 14 further comprises a control and / or regulating unit 60, in particular a processor with a memory module, for controlling and / or regulating the fan 56 during operation. The control and / or regulating unit 60 is provided, in particular, for automatically adjusting a power level of the fan 56.

[0033] Furthermore, the ventilation unit 14 has an energy storage device 62. The energy storage device 62 is formed by an accumulator. The energy storage device 62 serves to supply energy to the fan 56. The energy storage device 62 is arranged in the ventilation housing 18. The ventilation housing 18 accommodates the fan 56, partially the connecting unit 44, and the energy storage device 62. The ventilation housing 18 serves to protect and align the fan 56 and the energy storage device 62. Furthermore, the energy storage device 62 is designed to be replaceable.

[0034] The ventilation unit 14 has a connection interface 64 for receiving the at least one connection unit 44. The connection interface 64 is formed integrally with the ventilation housing 18. The connection interface 64 is arranged at the air outlet opening 58. During operation, the air flow 54 is forwarded from the air outlet opening 58 to the breathing mask unit 12 (see FIG. Fig. 1 and Fig. 2 ).

[0035] The connecting unit 44 connects the transfer unit 16 to the ventilation unit 14. The connecting unit 44 connects the transfer unit 16 to the ventilation unit 14 in an airtight manner with respect to the ambient air.

[0036] The connecting unit 44 is largely formed by a cylindrical hose-housing adapter. The connecting unit 44 is intended to be arranged in the connecting interface 64. The connecting interface 64 has a cylindrical outer contour. The connecting unit 44 is partially arranged in the ventilation unit 14, in particular in the ventilation housing 18. The connecting unit 44 is partially arranged in the ventilation unit 14, in particular in the ventilation housing 18, through the connecting interface 64.

[0037] The connecting unit 44 is detachably connected to the ventilation unit 14. The ventilation unit 14 has a movable fixing element 68 (see Fig. 2 and Fig. 3). The at least one connecting unit 44 can be at least partially fixed in the ventilation unit 14 by means of the displaceable fixing element 68. The connecting unit 44 has a locking groove 70. The locking groove 70 is provided for at least partially receiving the at least one fixing element 68. The locking groove 70 extends completely around a circular circumference of the connecting unit 44. The connecting unit 44 is designed to be invariant with respect to rotation about an air flow axis 66. The connecting unit 44 can be inserted into the connection interface 64 with any rotation about the air flow axis 66.

[0038] The fixing element 68 is in Figure 3shown. The fixing element 68 is designed as a fixing plate. The fixing element 68 has a rounded fixing edge 72, which is intended to encompass the cylindrical connecting unit 44 along the locking groove 70. The fixing element 68 is intended to encompass at least 50%, in particular at least 60%, of a circumference of the connecting unit 44. The fixing element 68 limits the mobility of the connecting unit 44 in the connecting interface 64 along the air flow axis 66 to a maximum of 1 mm. The connecting interface 64 and the fixing element 68 limit the mobility of the connecting unit 44 in the connecting interface 64 perpendicular to the air flow axis 66 to a maximum of 0.5 mm. The fixing edge 72 is intended to bear against the connecting unit 44.A curvature of the fixing edge 72 corresponds to a circular curvature along the locking groove 70 around the cylindrical connecting unit 44, in particular to enable rotation of the connecting unit 44 in the connecting interface 64.

[0039] The connecting unit 44 is movably mounted on the ventilation unit 14. The connecting unit 44 is mounted on the ventilation unit 14 so as to be at least partially rotatable about an air flow axis 66 of the connecting unit 44. The connecting unit 44 is mounted on the ventilation unit 14 so as to be rotatable by 360° about the air flow axis 66 of the connecting unit 44. Rotation of the transfer unit 16 and the connecting unit 44 is limited by the flexibility of the transfer unit 16.

[0040] The at least one connecting unit 44 has a valve element 74 for air flow regulation. In particular, the valve element 74 is designed as a return valve element.

[0041] The at least one connecting unit 44 can be permanently connected to the at least one ventilation unit 14. For example, the fixing element 68 can be welded to the ventilation housing 18 in a safety state. In the safety state, the connecting unit 44 is mounted on the ventilation unit 14 so as to be at least partially rotatable about the airflow axis 66 of the connecting unit 44.

[0042] The respiratory protection system 50 further comprises an external operating unit 20. The external operating unit 20 is formed by a remote control. The operating unit 20 comprises operating elements 22 and a control and / or regulating unit 24, which is provided for controlling and / or regulating the ventilation unit 14. The operating unit 20 comprises a battery element 26 for a power supply. The external operating unit 20 is connected, for example, to the ventilation unit 14 by means of a cable 28. The control and / or regulating unit 24 of the external operating unit 20 is provided in particular to control the ventilation unit 14 depending on an input at the operating elements 22. For example, a power level of the fan 56 of the ventilation unit 14 can be set via the operating elements 22. Furthermore, the fan 56 can be activated or deactivated via the operating elements 22.

[0043] Furthermore, the respiratory protection system 50 comprises a vest 46 for wear by a user 48. The vest 46 is formed from a fabric vest. The ventilation unit 14 is arranged on a back of the vest 46. The ventilation unit 14 is detachably connected to the vest 46. The ventilation unit 14 is worn on the back by a user 48 during operation using the vest 46. Furthermore, the external control unit 20 is intended to be worn by a user 48 on their chest. The external control unit 20 is arranged on a front of the vest 46. Reference symbol

[0044] 10 Blower device 12 Breathing mask unit 14 Ventilation unit 16 Transfer unit 18 Ventilation housing 20 Operating unit 22 Operating element 24 Control and / or regulation unit 26 Battery element 28 Cable 30 Mask body 32 Breathing area 34 Fastening strap 36 Snap buckle 38 Y-mask coupling air hose 40 Ventilation coupling air hose 42 Y-end piece 44 Connecting unit 46 Vest 48 User 50 Respiratory protection system 52 Head 54 Air flow 56 Fan 58 Air outlet opening 60 Control and / or regulation unit 62 Energy storage device 64 Connection interface 66 Air flow axis 68 Fixing element 70 Snap groove 72 Fixing edge 74 Valve element d Thickness

Claims

1. Blower device for a respiratory protection system (50), with at least one ventilation unit (14) which is configured for supplying air to a respiratory mask unit (12), with a transfer unit (16) for an air transfer from the ventilation unit (14) to the breathing mask unit (12), and with a connection unit (44) which is supported at least partially movably on the ventilation unit (14), which connects the transfer unit (16) to the ventilation unit (14), in particular in an at least substantially airtight manner, and which is arranged at least partially in the ventilation unit (14), wherein the ventilation unit (14) comprises a ventilation housing (18) and a connecting interface (64) for receiving the at least one connection unit (44), and wherein the connecting interface (64) is realized integrally with the ventilation housing (18), characterized in that the ventilation unit (14) comprises a displaceable fixing element (68) by which the at least one connection unit (44) can be fixed at least partially in the ventilation unit (14), the fixing element (68) being configured to fix the connection unit (44) on the ventilation housing (18) and the fixing element (68) being configured for a displacement in the ventilation housing (18).

2. Blower device according to claim 1, characterized in that the connection unit (44) is detachably connected with the ventilation unit (14).

3. Blower device according to claim 1 or 2, characterized in that the connection unit (44) is supported at least partially on the ventilation unit (14) so as to be rotatable around an air flow axis (66) of the connection unit (44).

4. Blower device according to one of the preceding claims, characterized in that the at least one connection unit (44) is non-detachably connected with the at least one ventilation unit (14).

5. Blower device according to one of the preceding claims, characterized in that the connection unit (44) comprises a latching groove (70) for at least partially receiving the at least one fixing element (68).

6. Blower device according to one of the preceding claims, characterized in that the at least one connection unit (44) comprises at least one valve element (74) for an air flow regulation.

7. Transfer unit with a connection unit (44) according to one of the preceding claims, characterized in that the connection unit (44) and the transfer unit (16) are realized integrally.

8. Respiratory protection system with at least one breathing mask unit (12) and with a blower device (10) according to one of the preceding claims.