Ventilator having a sound-attenuating device

Abstract

The invention relates to a ventilator having at least one sound-attenuating device, wherein: the ventilator comprises a housing having at least one device input, at least one device output and at least one duct to conduct respiratory gas; the duct is formed between the device input and the device output; at least one respiratory-gas source is located in or on the duct for generating a respiratory-gas flow, and therefore the duct has at least one suction side having a suction channel, and has at least one discharge side having an outlet channel; the respiratory-gas flow is guided in the suction channel from the device input to the respiratory-gas source, and sound waves run in a direction of sound from the respiratory-gas source towards the device input and therefore counter to the flow direction; and the respiratory-gas flow flows in the outlet channel from the respiratory-gas source to the device output, and sound waves run in a direction of sound from the respiratory-gas source towards the device output and therefore in the flow direction, characterized in that the sound-attenuating device is located on the suction side in or on the suction channel and / or on the discharge side in or on the outlet channel, wherein the sound-attenuating device is designed and configured to attenuate sound waves which run in the flow direction and / or counter to the flow direction of the respiratory gas.

Description

[0001] Ventilator with a sound attenuation device

[0002] Ventilators are used both in clinical settings and in the home. Ventilators can be used for both ventilation and anesthesia, as well as for the treatment of sleep disorders, respiratory support, or cough support. Ventilators have a flow channel with a device inlet and outlet, and a fan located between them to generate a flow of respiratory gas. For this purpose, the fan housing typically contains at least one rotatably mounted fan impeller driven by a motor.

[0003] To ensure that ventilation, respiratory therapy, or respiratory support is not perceived as disturbing, the operating noise of the ventilator should be as low as possible. Operating noise is generated by sound waves generated, for example, by the blower, impeller, motor, air duct, and cooling fans.

[0004] Ventilators equipped with sound-absorbing foams are known from the prior art. For example, EP 3 708 208 A2 shows a ventilation device with a pneumatic line and absorber foams for sound insulation. However, it has been shown that some foams can have negative effects on patient health.

[0005] The object of the present invention is therefore to provide a ventilator that can be operated particularly quietly and safely.

[0006] This object is achieved with a ventilator according to claim 1 and with a sound-damping device for a ventilator according to claim 28. Further developments and advantageous embodiments are the subject of the subclaims. Further advantages and features will become apparent from the general description and the description of the exemplary embodiments.

[0007] It should be noted that the features listed individually in the claims can be combined with one another in any technically reasonable manner and demonstrate further embodiments of the invention. The description further characterizes and specifies the invention, particularly in conjunction with the figures.

[0008] The subclaims relate to various independent, advantageous developments of the present invention, the features of which can be freely combined by a person skilled in the art within the scope of what is technically reasonable. This applies in particular beyond the boundaries of the various claim categories.

[0009] The invention relates to a ventilator with at least one sound attenuation device, wherein the ventilator comprises a housing with at least one device inlet and at least one device outlet and at least one channel for conducting respiratory gas, wherein the channel is formed between the device inlet and the device outlet, wherein at least one respiratory gas source for generating a respiratory gas flow is arranged in or on the channel, so that the channel comprises at least one suction side with an intake channel and at least one pressure side with an outlet channel, wherein the respiratory gas flow in the intake channel leads from the device inlet to the respiratory gas source and sound waves run in a sound direction from the respiratory gas source towards the device inlet and thus opposite to the flow direction,and wherein the respiratory gas flow in the outlet channel leads from the respiratory gas source to the device outlet and sound waves run in a sound direction from the respiratory gas source towards the device outlet and thus equal to the flow direction, characterized in that the sound damping device is arranged on the suction side in or on the intake channel and / or on the pressure side in or on the outlet channel, wherein the sound damping device is arranged and designed to dampen sound waves that run concurrently with and / or opposite to the flow direction of the respiratory gas.

[0010] In some embodiments, the ventilator is characterized in that the intake channel and / or the outlet channel comprises at least one, preferably at least two, particularly preferably a plurality of sound dampening devices.

[0011] In some embodiments, the ventilator is characterized in that the sound dampening device comprises at least one chamber with at least one opening, via which the chamber is pneumatically coupled to the channel such that at least a portion of the respiratory gas conducted through the channel flows into the chamber; wherein the chamber comprises at least one impact element that is configured and designed to reflect sound waves entering the chamber, in particular to reflect them multiple times.

[0012] In some embodiments, the ventilator is characterized in that the impact elements are designed or arranged such that sound waves entering the chamber are reflected at least twice, preferably at least four times, particularly preferably at least six times, in particular ten times or more often.

[0013] In some embodiments, the ventilator is characterized in that the chamber comprises at least one curved baffle element and / or that the chamber comprises at least a first baffle element and a second baffle element that are aligned at an angle ß to each other.

[0014] In some embodiments, the ventilator is characterized in that the chamber has a basic geometric shape selected from the group: round, oval, square, trapezoidal, triangular, square, polygonal.

[0015] In some embodiments, the ventilator is characterized in that the curved baffle element encloses the chamber in such a way that the chamber is substantially round or oval and has an opening for pneumatic connection to the channel.

[0016] In some embodiments, the ventilator is characterized in that the radius of curvature of the curved impact element is not constant.

[0017] In some embodiments, the ventilator is characterized in that the angle ß is greater than 0°, wherein the angle ß is preferably in a range from 0.1° up to and including 90°, more preferably in a range between 5° and 70° inclusive, in particular in a range between 15° and 45°. In some embodiments, the ventilator is characterized in that the intake channel has a channel wall that encloses a lumen of the intake channel, and that the outlet channel has a channel wall that encloses a lumen of the outlet channel.

[0018] In some embodiments, the ventilator is characterized in that the first impact element is aligned at a first angle al to the channel wall, wherein the first angle al is greater than 0° and less than 180°, wherein the first angle al is preferably in a range between 90° and 180° inclusive, particularly preferably in a range between 90° and 160° inclusive, more preferably in a range between 100° and 140°, in particular in a range between 110° and 130°.

[0019] In some embodiments, the ventilator is characterized in that the second impact element is aligned at a second angle a2 to the channel wall, wherein the second angle a2 is greater than 0° and less than 180°, wherein the second angle a2 is preferably in a range between 20° and 180°, more preferably in a range between 60° and 160°, in particular in a range between 80° and 140°.

[0020] In some embodiments, the ventilator is characterized in that the first angle a1 and the second angle a2 are preferably of different sizes, wherein the deviation between the first angle a1 and the second angle a2 is more than 0.1°, particularly preferably more than 5°, more preferably more than 10°.

[0021] In some embodiments, the ventilator is characterized in that the sound waves are deflected by reflection at the impact elements such that the sound direction is at an angle y to the flow direction of the respiratory gas, wherein the angle y is in a range between 50° and 130°, preferably in a range between 70° and 110°, more preferably in a range between 80° and 100°.

[0022] In some embodiments, the ventilator is characterized in that the impact elements are preferably arranged relative to one another in such a way that the sound direction is at an angle y to the flow direction of the respiratory gas, which is approximately 90°.

[0023] In some embodiments, the ventilator is characterized in that the channel wall of the intake channel and / or the channel wall of the outlet channel is double-walled with an inner channel wall and an outer channel wall.

[0024] In some embodiments, the ventilator is characterized in that the inner channel wall and the outer channel wall are irreversibly or reversibly connectable to each other, preferably reversibly.

[0025] In some embodiments, the ventilator is characterized in that the sound-damping device comprises a channel, wherein the channel is formed in the inner channel wall and configured to provide a pneumatic connection between the channel of the ventilator and the chamber. In some embodiments, the ventilator is characterized in that the outer channel wall is configured, in conjunction with the inner channel wall, to form the at least one chamber of the sound-damping device, wherein the outer channel wall comprises the at least one impact element.

[0026] In some embodiments, the ventilator is characterized in that the chamber is closed at least on two sides by the first impact element and the second impact element, wherein the impact elements are arranged opposite one another, wherein the chamber has two openings.

[0027] In some embodiments, the ventilator is characterized in that the openings are designed such that the breathing gas flows into the chamber through the first opening in the flow direction and flows out of the chamber through the second opening, wherein the baffle elements are aligned with each other such that the sound waves are separated from the main flow of the breathing gas by reflection at the first baffle element and remain in the chamber.

[0028] In some embodiments, the ventilator is characterized in that at least one web, preferably at least two, three, four, five, six or more webs are arranged in the lumen of the outlet channel.

[0029] In some embodiments, the ventilator is characterized in that the webs divide the outlet channel at least in sections lengthwise in such a way that the outlet channel is at least in sections divided into sub-channels, wherein a sub-channel is formed between each two webs and / or between the channel wall and a web.

[0030] In some embodiments, the ventilator is characterized in that the webs are designed such that at least one chamber enclosed on two sides with the one first impact element and the one second impact element and the two openings is formed in the sub-channels.

[0031] In some embodiments, the ventilator is characterized in that the chamber comprises at least one third baffle element, wherein the chamber is closed on three sides at least by the first baffle element and the second baffle element and the third baffle element such that the chamber has only one opening.

[0032] In some embodiments, the ventilator is characterized in that the first impact element is arranged at least partially in the lumen of the intake channel and is configured to redirect at least the sound waves from the intake channel such that they reach the chamber.

[0033] In some embodiments, the ventilator is characterized in that at least one element is arranged in the intake channel adjacent to the device inlet and / or in or at the device inlet, which element is configured to redirect and / or restrict and / or block the direction of sound. The elements are particularly configured and designed to guide the sound waves into the sound-damping device. In some embodiments, the ventilator is characterized in that the impact elements are designed or arranged such that the sound waves remain in the chamber.

[0034] In some embodiments, the channel and all components within the channel can be designed without foam and / or fleece. The channel can, in particular, be made of a non-porous material. This offers the advantage that the channel, and thus the respiratory gas path, is particularly safe for the patient, as no harmful substances can form in the channel and / or be released into the respiratory gas. Non-porous material is not as susceptible to cleaning agents as foam materials, making cleaning, disinfection, or sterilization of the channel easier and safer.

[0035] Overall, such a ventilator offers the advantage that disruptive operating noises are significantly reduced thanks to the sound-damping device, especially without the need for foam insulation within the ventilator. This can increase patient safety and simplify maintenance and cleaning of the ventilator.

[0036] The invention further relates to a sound dampening device for a ventilator having at least one channel for conducting respiratory gas according to claim 28, wherein the sound dampening device comprises: at least one chamber having at least one opening, via which the chamber is pneumatically coupled to the channel such that at least a portion of the respiratory gas conducted through the channel flows into the chamber; wherein the chamber comprises at least one impact element, characterized in that the impact element is configured and designed to repeatedly reflect sound waves entering the chamber.

[0037] The figures show exemplary embodiments of the sound-damping devices according to the invention for a ventilator. They show:

[0038] Fig. 1 is a very schematic representation of a ventilator;

[0039] Fig. 2 exemplary representations of a partial section of the outlet channel with embodiments of the sound damping device;

[0040] Fig. 3 exemplary representations of a partial section of the intake duct with further embodiments of the sound damping device;

[0041] Fig. 4 schematic representations of the duct wall with sound damping devices of a further embodiment;

[0042] Fig. 5 exemplary representations of a device inlet with a sound dampening device.

[0043] The following exemplary embodiments describe the sound dampening device 10 according to the invention for a ventilator 1. Further features and advantages of the present invention will become clear in the following descriptions of exemplary embodiments with reference to the figures. The invention is not limited to the exemplary embodiments shown. Figure 1 shows a very schematic representation of a ventilator 1. For the purposes of the invention, a ventilator 1 is understood to mean all devices that support a patient or other user in natural breathing and / or provide ventilation and / or are used for respiratory therapy and / or for inhalation anesthesia and / or otherwise influence the breathing of a user or patient. Patient and user are used synonymously herein and refer to any individual who uses a ventilator 1.The ventilators 1 may include, for example, but not exclusively, ventilators for clinical or home use, respiratory therapy devices, CPAP, APAP and bi-level devices, high-flow therapy devices, anesthesia or anaesthesia devices, clinical, home or emergency ventilators, oxygen-delivering devices, diagnostic systems and cough therapy devices or cough machines.

[0044] The ventilator 1 comprises a housing 2. The housing 2 has at least one device inlet 20 and at least one device outlet 40. The ventilator 1 comprises at least one channel 7 with a channel wall 13. The channel 7 is formed within the housing 2. The channel 7 is formed between the device inlet 20 and the device outlet 40. The channel 7 is configured and designed to carry a breathing gas A. Breathing gas A, within the meaning of the invention, comprises any fluid, gas, or gas mixture suitable for ventilation, respiration, anesthesia, and / or respiratory therapy. Breathing gas A can be at least partially ambient air. The channel 7 can be divided into at least one intake channel 21 and at least one outlet channel 41.

[0045] Respiratory gases A, in particular ambient air, can be fed into the channel 7, in particular into the intake channel 21, via the at least one device inlet 20. The ventilator 1 can also have a plurality of device inlets 20, via which further respiratory gases, such as fresh gas, oxygen, anesthetics (not shown), can be introduced into the channel 7 alternatively or additionally. For this purpose, in some embodiments, at least one connection unit (not shown) for connecting a hose or hose system can be arranged at the device inlet 20, via which respiratory gases (fresh gas, oxygen, anesthetics) can be introduced into the channel 7. The channel 7 can be made of a non-porous material and / or designed without foam insulation. At least one filter 6 can be arranged in or on the device inlet 20, which can filter the fed-in respiratory gas A, in particular the fed-in ambient air.In some embodiments, a filter system comprising several filters 6 can also be arranged in or at the device inlet 20. The filters 6 are configured and designed to filter out possible solid particles from the introduced fluids.

[0046] The breathing gas can be released from channel 7 via device outlet 40 and made available to the patient, for example, via a hose system and / or a patient interface. Contrary to what the schematic view in Fig. 1 suggests, device inlet 20 and device outlet 40 do not have to be located on two opposite side walls of the housing. Rather, it is advantageous if the breathing gas is guided through the housing over a longer path by multiple deflections, which can reduce noise. Channel 7 therefore advantageously does not generally run in a straight line. At least one connection unit 5 can be arranged at device outlet 40. Connection unit 5 is designed to connect hose systems (not shown here) and / or a patient interface to ventilator 1. The hose system and / or the patient interface can be pneumatically connected to channel 7 of ventilator 1.The hose system is also designed and constructed to carry a breathing gas A, so that breathing gas A of the ventilator 1 can be supplied to the patient or user via the hose system.

[0047] To connect to the patient, a patient interface can be connected to the tube system or to the ventilator 1. Within the meaning of the invention, a patient interface is understood to be any peripheral device designed to interact with a living being. In particular, the patient interface is designed for therapeutic and / or diagnostic purposes in conjunction with the ventilator 1. The patient interface can be designed as a breathing mask. This includes, for example, but is not limited to, nasal masks, nasal cushion masks, nasal cannulas or oxygen cannulas, full-face or total-face masks, and tracheal tubes or cannulas.

[0048] At least one respiratory gas source 3 is arranged in or on the duct 7. The respiratory gas source 3 can be or include at least one compressed gas connection. In some embodiments, the respiratory gas source 3 can also be a valve unit or a blower unit with one or more blowers. The respiratory gas source can in particular be a blower 3. The blower 3 comprises at least one impeller (not shown here) with which a respiratory gas flow is generated for ventilation, anesthesia, or respiratory therapy. The blower 3 can divide the duct 7 into a suction side 8 and a pressure side 9. The suction side 8 is located upstream of the blower 3. The pressure side 9 is located downstream of the blower 3.

[0049] The fan 3 is controlled by a control device 4. The control device 4 is typically located inside the ventilator 1. For example, the control device 4 sets a specific speed of the fan wheel depending on the therapy specifications and / or the ventilation conditions or regulates the fan speed to a target value. The speed of the fan wheel can be adaptively adjusted to the respective conditions during ventilation, anesthesia, or respiratory support.

[0050] The blower 3 is then configured and designed to generate a respiratory gas flow with a flow direction RI. The respiratory gas flows—as indicated by the block arrow in Fig. 1—in at least one flow direction RI. The flow direction RI generally runs from the device inlet 20 to the device outlet 40. The flow direction RI generally runs from the suction side 8 to the pressure side 9 of the blower 3. The duct 7 and / or the respiratory gas flow are generally not straight. The respiratory gas can be deflected at least once, advantageously several times, in the duct 7 (not shown). The noise can be reduced by deflecting the flow.

[0051] The duct 7 can be divided into at least one intake duct 21 and at least one outlet duct 41. The intake duct 21 can extend from the device inlet 20 to the blower 3. The intake duct 41 is located upstream of the blower 3. The intake duct 41 is formed on the suction side 8 of the blower 3. The outlet duct 41 can extend from the blower 3 to the device outlet 40. The outlet duct 41 is located downstream of the blower 3. The outlet duct 41 is formed on the pressure side 9 of the blower 3. Respiratory gases A can be conveyed from the device inlet 20 to the blower 3 via the intake duct 21. Respiratory gases can be conveyed from the blower 3 to the device outlet 40 via the outlet duct 41. For example, ambient air can be sucked into the intake duct 21 via the device inlet 20 and conveyed to the device outlet 40 via the outlet duct 41, with the fan 3 providing the energy to generate the breathing gas flow.

[0052] The ventilator 1 can have at least one sound-damping device 10 according to the invention (see Figs. 2-5). The sound-damping device 10 can be formed on the intake side 8 and / or the pressure side 9. The sound-damping device 10 can be formed in or on the duct 7 of the ventilator 1. The sound-damping device 10 can be formed as an integral component of the duct 7. In particular, the sound-damping device 10 can alternatively or additionally be arranged in the duct wall 13 of the duct.

[0053] Figures 2 to 5 show exemplary embodiments of the sound dampening device 10 for the ventilator 1. The ventilator comprises at least one sound dampening device. The ventilator has a housing with at least one device inlet and at least one device outlet and comprises at least one channel for conducting respiratory gas. The channel is formed between the device inlet and the device outlet. At least one respiratory gas source for generating a respiratory gas flow is arranged in or on the channel. The channel comprises at least one suction side with an intake channel and at least one pressure side with an outlet channel. The respiratory gas flow leads in the intake channel from the device inlet to the respiratory gas source. Sound waves in the intake channel generally travel essentially in a sound direction from the respiratory gas source towards the device inlet and thus opposite to the flow direction.In the outlet channel, the breathing gas flow leads from the breathing gas source to the device outlet. Sound waves in the outlet channel generally travel essentially in one sound direction, from the breathing gas source toward the device outlet, and thus parallel to the flow direction. The sound attenuation device is located on the intake side in or on the intake channel and / or on the pressure side in or on the outlet channel. The sound attenuation device is designed and constructed to attenuate sound waves that travel parallel to and / or opposite to the flow direction of the breathing gas.

[0054] The sound dampening device 10 comprises at least one channel 11 for conducting respiratory gas. The channel 11 of the sound dampening device 10 can correspond to the channel 7 of the ventilator 1 and / or be designed as an additional channel 11 that can be connected to the channel 7 of the ventilator 1. The sound dampening device 10 comprises at least one chamber 12 with at least one opening 19, via which the chamber 12 is pneumatically coupled to the channel 7 such that at least a portion of the respiratory gas A conducted through the channel 7 flows into the chamber 12. The chamber 12 comprises at least one impact element 14, 15, 16, 17, 18. The impact element 14, 15, 16, 17, 18 is designed and constructed to repeatedly reflect sound waves S entering the chamber 12. The impact elements 14, 15 are arranged relative to one another in such a way that sound waves S entering the chamber 12 are reflected several times by the impact elements 14, 15 in such a way that the sound is reduced.

[0055] The reduction of sound can be achieved through damping and / or insulation and / or sound wave superposition (interference) and / or absorption. The term "sound damping" is sometimes used herein as an umbrella term for all physical effects that can reduce sound. In particular, sound damping within the meaning of the invention includes both sound damping through reflection and sound insulation through absorption, as well as sound cancellation through destructive interference. In particular, sound is preferably reduced through reflection.

[0056] Figure 2 shows exemplary representations of a partial section of the outlet channel 41 with exemplary embodiments of the sound dampening device 10. The sound dampening device 10 can be formed on the pressure side 9 of the fan 3 in or on the outlet channel 41. Since the operating noises of the ventilator 1 are generated, for example, by the fan 3, the impeller, or the motor, the sound direction R2 in the outlet channel 41 generally runs in the direction from the interior of the device to the device outlet 40. In the figures, the flow direction RI of the respiratory gas is represented by a block arrow and the sound direction R2 by a single arrow.

[0057] From Fig. 2 AE it can be seen that the sound waves S in the outlet channel 41 initially run in the same direction R2 as the flow direction RI of the breathing gas, namely from the interior of the device, for example from the fan 3 towards the device outlet 40.

[0058] To minimize the operating noise of the ventilator 1, it is advantageous that no sound waves S reach the device outlet 40. The sound attenuation device 10 is configured and designed to block the path for the sound waves S. The sound attenuation device 10 is further configured and designed to allow the respiratory gas to reach the device outlet 41.

[0059] The outlet channel 41 is defined by a channel wall 42. The channel wall 42 encloses a lumen 43 of the outlet channel 41, through which the breathing gas A can be conducted. The lumen 43 of the outlet channel 41 can be designed free of any further elements. The channel wall 42 itself can then form a sound-damping device 10 (Fig. 2 A / B).

[0060] In a simplest embodiment, as shown in Fig. 2 A / B, the sound dampening device 10 can comprise a channel 11, a chamber 12, a first impact element 14, and a second impact element 15. In this exemplary embodiment, the channel 11 of the sound dampening device 10 corresponds to the intake channel 41. The channel 11 is designed to conduct respiratory gases. Sound waves of the respiratory gas can also be transported, at least in part, in the channel 11. The sound dampening device 10 is characterized in that at least one chamber 12 is formed. The chamber 12 comprises at least two opposing impact elements 14, 15. The first impact element 14 and the second impact element 15 form the chamber 12. The chamber 12 is closed on at least two sides and is delimited by the impact elements 14, 15.

[0061] According to the invention, the first impact element 14 and the second impact element 15 are arranged relative to one another in such a way that sound waves S passing from the channel 11 into the chamber 12 are reflected multiple times by the impact elements 14, 15. The reflection of the sound waves reduces and / or absorbs and / or dampens and / or insulates and / or superimposes the sound.

[0062] To prevent the sound waves from leaving the chamber 12, the first impact element 14 and the second impact element 15 are not parallel to each other. For illustration purposes, planes E1, E2, and E3 are shown in Fig. 2B. A plane E1 represents the main orientation of the duct wall 42 upstream and / or downstream of the sound dampening device 10. A plane E2 represents the orientation of the first impact element 14. A plane E3 represents the orientation of the second impact element 15.

[0063] From Fig. 2B it can be seen that the first impact element 14 (plane E2) is aligned at a first angle a1 to the channel wall 42 (plane E1). The first angle a1 is greater than 0° and less than 180°. The first angle a1 can preferably lie in a range between 90° and 180° inclusive. The first angle a1 can preferably lie in a range between 90° and 160° inclusive, more preferably in a range between 100° and 140°. In the specific exemplary embodiment according to the figures, the first angle a1 can lie in a range between 110° and 130°. For example, the first angle a1 is 122°.

[0064] Fig. 2B further shows that the second impact element 15 (plane E3) is oriented at a second angle a2 to the channel wall 42 (plane E1). The second angle a2 is greater than 0° and less than 180°. The second angle a2 can preferably be in a range between 20° and 180°, more preferably in a range between 60° and 160°. The second angle a2 can preferably be in a range between 80° and 140° inclusive.

[0065] In the specific embodiment shown in Fig. 2, the second angle a2 can be in a range between 100° and 140°, preferably between 120° and 140°. For example, the second angle a2 is 134°.

[0066] Furthermore, Fig. 2B shows that the second impact element 15 (plane E3) is aligned at an angle ß to the first impact element 14 (plane E2). The angle ß describes the angle at which the planes E2, E3 of the impact elements 14, 15 meet at an imaginary vanishing point F (see Fig. 2B).

[0067] The first impact element 14 and the second impact element 15 are not parallel to each other, so the angle ß is greater than 0°. Considering the flow direction RI of the breathing gas, the first impact element 14 and the second impact element 15 are aligned converging toward each other. Thus, the basic shape of the chamber 12 is preferably trapezoidal.

[0068] The angle ß can be in a range between 0.1° and 90°. Preferably, the angle ß can be in a range between 0.1° and 45°, more preferably in a range between 5° and 30° inclusive. In the specific embodiment according to the figures, the angle ß can be in a range between 5° and 20°; for example, the angle ß is 12°.

[0069] Accordingly, the first angle a1 and the second angle a2 are preferably different. The deviation is preferably more than 0.1°, particularly preferably more than 5°, and even more preferably more than 10°. For example, the deviation between the first angle a1 and the second angle a2 is 12°.

[0070] The impact elements 14, 15 can be designed as flat or curved surfaces. In the exemplary embodiments according to Figures 2 to 4, the impact elements 14, 15 are designed as flat surfaces. On flat surfaces, the rule applies that sound waves are reflected such that the angle of incidence is equal to the angle of reflection.

[0071] The impact elements 14, 15 are arranged relative to one another such that the sound waves are reflected multiple times. The sound waves coming from the outlet channel 41 initially strike the first impact element 14. The first impact element 14 is configured and designed to reflect the sound waves. The first impact element 14 is oriented such that the sound waves are directed to the second impact element 15. The sound waves are then reflected by the second impact element 15. The second impact element 15 is configured and designed to reflect the sound waves. The second impact element 15 is oriented such that the sound waves are directed back to the first impact element 14, and so on. Thus, the sound waves S remain within the chamber 12.

[0072] The impact elements 14, 15 are arranged relative to one another in such a way that the sound waves are reflected at least twice, preferably at least four times, particularly preferably at least six times, and especially ten or more times. Due to the multiple reflection of the sound waves, the sound waves can be attenuated by absorption and / or superposition. Preferably, the sound waves are reflected an infinite number of times without re-entering the channel 11.

[0073] It can also be seen from Fig. 2B that the sound waves S are deflected by reflection at the impact elements 14, 15,... such that the sound direction R2 is at an angle y to the flow direction RI of the respiratory gas. The angle y lies in a range between 50° and 130°, preferably in a range between 70° and 110°, more preferably in a range between 80° and 100°. The impact elements 14, 15,... can preferably be arranged relative to one another such that the sound direction R2 is at an angle y to the flow direction RI of the respiratory gas, which angle is approximately 90°. By arranging the impact elements 14, 15,... relative to one another, the sound waves can, in some embodiments, preferably be deflected such that they run perpendicular to the flow direction of the respiratory gas.

[0074] From Fig. 2B it can be seen that the channel wall 42 does not run straight due to the integration of the sound dampening device 10, but has an offset. This offset caused by the sound dampening device 10 holds back the sound waves of the respiratory gas without significantly impairing the flow of the respiratory gas. The respiratory gas can pass through the sound dampening device 10 and the sound waves are stopped and / or reduced. Fig. 2C / D show exemplary representations of a partial section of the outlet channel 41 with a sound dampening device 10 and a plurality of chambers 12. From Fig. 2C it can be seen that elements can be arranged in the lumen 43 of the outlet channel 41, which can subdivide the lumen at least in sections. In some embodiments, at least one web 44 can be arranged in the lumen 43.In preferred embodiments, a plurality of webs 44 can be arranged in the lumen 43, in particular at least two, three, four, five, six, or more. In the specific embodiment according to Fig. 2 C / E, six webs 44 can be arranged in the outlet channel 41. The webs 44 can be arranged in the outlet channel 41 such that they subdivide the outlet channel 41 along the length L.

[0075] In some embodiments, the webs 44 can extend through the entire length of the outlet channel 41 and completely subdivide the channel 41 into at least two, preferably several, subchannels 11. For example, 100% of the outlet channel 41 is subdivided by the webs 44 (not shown). In the specific embodiment according to Figs. 2C / 2D, the webs 44 are arranged only in a partial region of the outlet channel 41. Preferably, less than 100% of the outlet channel 41 is subdivided by the webs 44, particularly preferably less than 80%, in particular less than 50%.

[0076] In the specific embodiment according to Fig. 2C / 2D, six webs 44 divide the outlet channel 41 into sections into seven channels 11, each of which contains a chamber 12. The arrangement of fewer or more webs 44 is conceivable. The arrangement of the webs 44 allows the respiratory gas flow through the outlet channel 41 to be divided at least in sections. When selecting the number of webs 44, it should be considered that the overall cross-section of the outlet channel 41 should not be significantly reduced and that a corresponding number of sub-channels 11 are formed. The cross-section of the combined sub-channels 11 should generally result in an internal diameter of at least 19 mm.

[0077] The arrangement of the webs 44 in the outlet channel 41 divides the outlet channel 41, at least in sections, into a plurality of sub-channels 11. A channel 11 is formed between each two webs 44 and / or between the channel wall 42 of the outlet channel 41 and a web 44. A chamber 12 is formed within each channel 11. Thus, the webs 44 are configured and designed to form at least one sound-damping device 10 with at least one channel 11 and one chamber 12. The webs 44 are thus configured and designed such that they open the flow path for the breathing gas while blocking the sound path.

[0078] Fig. 2D shows an example of how two adjacent webs 44 can be arranged relative to one another to form a sound-damping device 10. The webs 44 can be divided into sections, for example, a first section 45, a second section 46, a third section 47...

[0079] The first sections 45 of the webs 44 are arranged relative to one another or to the outer wall 42 such that a first subsection of the channel 11-1 is formed. The breathing gas is introduced into the first subsection of the channel 11-1 with a flow direction RI together with the sound waves S of the breathing gas. The first subsection of the channel 11-1 is preferably straight. The second sections 46 of the webs 44 are arranged relative to one another or to the outer wall 42 such that the chambers 12 are formed. The same dimensions and angles are used as previously described for Figures 2A / B. The chamber 12 is preferably trapezoidal in shape and surrounded on two sides by the first impact element 14 and the second impact element 15. The second sections 46 can each form a first impact element 14 of a first chamber 12 and a second impact element 15 of an adjacent second chamber 12 (see Fig. 2D).

[0080] The third sections 47 of the webs 44 are arranged relative to one another or relative to the outer wall 42 such that a second section of the channel 11-2 is formed. The breathing gas is introduced in the flow direction RI from the chamber 12 into the second section of the channel 11-2. The sound waves remain in the chambers 12 and advantageously do not enter, or only to a small extent, the second section of the channel 11-2. The second section of the channel 11-2 is preferably straight. The second section of the channel 11-2 can be longer than the first section 11-1 of the channel. The second section 11-2 is designed to eliminate turbulence that can arise from the passage of air through the chamber 12.

[0081] Fig. 2E shows a perspective view of the outlet channel 41. From Fig. 2E, it can be seen that, due to the integration of the sound-damping device 10 or the chambers 12, the channel 11 is not straight, at least in some sections, but can have an offset. This offset retains the sound waves of the breathing gas without significantly impairing the flow of the breathing gas. The breathing gas can pass through the channels 11 of the sound-damping device 10, thereby reducing the sound waves.

[0082] The sound dampening devices 10 of the exemplary embodiments according to Figures 2A-E are preferably arranged on the pressure side 9 in the outlet channel 41. In some embodiments, it is conceivable that such embodiments could alternatively or additionally be arranged on the suction side 8 in the intake channel 21 (not shown). In this case, it should be noted that the sound direction R2 in the intake channel 21 generally runs in the direction from the device interior to the device inlet 20 and thus opposite to the flow direction RI of the breathing gas. Accordingly, the orientation of the sound dampening device would have to be reversed.

[0083] Figure 3 shows exemplary representations of a partial section of the intake duct 21 with further embodiments of the sound-damping device 10. The sound-damping device 10 can alternatively or additionally be formed on the intake side 8 of the fan 3 in or on the intake duct 21. Since the operating noises of the ventilator 1 are generated, for example, by the fan 3, the impeller, or the motor, the sound direction R2 in the intake duct 21 generally runs from the interior of the device to the device inlet 20.

[0084] The sound dampening device 10 can be implemented in the intake duct 21 according to the exemplary embodiments described above (not shown). Preferably, the sound dampening device 10 can be configured differently in the intake duct 21 than in the outlet duct 41 (Fig. 3). It can be seen from Fig. 3 that the sound waves S in the intake duct 21 generally travel in the opposite direction R2 to the flow direction RI of the breathing gas. The sound waves can propagate from the interior of the device, for example, from the blower 3, toward the device inlet 20. However, when the blower is operating, the flow direction RI of the breathing gas runs from the device inlet 20 to the blower 3.

[0085] To minimize the operating noise of the ventilator 1, it is advantageous that the sound waves S do not reach the device inlet 20. The sound attenuation device 10 is configured and designed to block the path for the sound waves S. The sound attenuation device 10 is further configured and designed to allow the respiratory gas to reach the interior of the device, i.e., to the fan 3.

[0086] The intake channel 21 is delimited by a channel wall 22. The channel wall 22 encloses a lumen 23 of the intake channel 21, through which the breathing gas A can be conducted. The intake channel 21 can have at least one sound-damping device 10 comprising at least one channel 11, a chamber 12, a first impact element 14, and a second impact element 15. Preferably, the intake channel 21 can have at least two sound-damping devices 10, particularly preferably at least 4, 6, 8, 10, or more.

[0087] As can be seen from Fig. 3B, the arrangement of the first impact element 14 and the second impact element 15 to one another and to the channel wall 22 can be similar to that previously described for Figure 2. In this exemplary embodiment, too, the first impact element 14 (plane E2) is aligned at the first angle α1 to the channel wall 22 (plane E1). The second impact element 15 (plane E3) is aligned at the second angle α2 to the channel wall 22 (plane E1). The second impact element 15 (plane E3) is aligned at an angle β to the first impact element 14 (plane E2). The first impact element 14 and the second impact element 15 are not aligned parallel to one another. The first impact element 14 and the second impact element 15 are aligned so as to converge towards one another (see Fig. 3B).

[0088] In this exemplary embodiment, at least the first impact element 14 and the second impact element 15 form the chamber 12 (not shown). However, the chamber 12 can also comprise at least a third impact element 16, so that the chamber 12 can be closed on three sides and delimited by the impact elements 14, 15, 16. The basic shape of the chamber 12 can be trapezoidal (see Fig. 3). In some embodiments, other geometric shapes of the chamber 12 are also conceivable. For example, the chamber 12 can have more than three impact elements 14, 15, 16, in particular 4, 5, 6, 7, 8 or more. Accordingly, the chamber can also have a polygonal basic shape, for example a hexagonal, an octagonal, or a twelfth-sided basic shape. A round or oval chamber 12 is also conceivable (see Fig. 5). The shape of the chamber 12 should be chosen so that the sound waves are reflected as frequently as possible by the impact elements 14, 15, 16.

[0089] The special feature of the embodiment according to Fig. 3 is that the chambers 12 can be arranged at least partially outside the actual intake channel 21. Only the first impact element 14 can be arranged at least partially in the lumen 23 of the intake channel. In the embodiment according to Fig. 3, the first impact element 14 can protrude at least partially into the lumen 23. The first impact element 14 is set up and designed to block the path for the sound waves S. The first impact element 14 is set up and designed to clear the path for the respiratory gas. The first impact element 14 is set up and designed to deflect the sound waves S. The first impact element 14 is aligned such that the sound waves S are guided out of the intake channel 21 and into the chamber 12. The respiratory gas flow, on the other hand, can be sucked in in its main direction RI from the device inlet 20 to the blower 3.

[0090] The impact elements 14, 15 are arranged relative to one another in such a way that the sound waves are reflected multiple times. The sound waves coming from the intake duct 21 initially strike the first impact element 14. The first impact element 14 is designed and configured to reflect the sound waves. The first impact element 14 is aligned in such a way that the sound waves are directed into the chamber 12 and to the second impact element 15. In the chamber 12, the sound waves can be reflected multiple times between the first impact element 14 and the second impact element 15, so that the sound waves S remain within the chamber 14. Due to the arrangement of the impact elements 14, 15, 16, the sound waves S cannot re-enter the intake duct 21.

[0091] Preferably, at least two sound-damping devices 10 are arranged in or on the intake duct 21. The sound-damping devices 10 can preferably be arranged on opposite sides. The first impact elements 14 are each arranged such that they overlap in the lumen 23 of the intake duct 21 (see Fig. 3). This provides effective sound deflection toward the two chambers 12.

[0092] The ends of the first impact elements 14 projecting into the lumen 23 can be straight (not shown). In preferred embodiments, the ends of the first impact elements 14 can have a terminal curvature. This can positively influence the flow pattern of the respiratory gas A (see Fig. 3).

[0093] The diameter of the intake channel 21-D can be constant or variable. The ends of the first impact elements 14 projecting into the lumen 23 can influence the diameter of the intake channel 21-D. From Fig. 3A, it can be seen that the intake channel 21 can have at least a first diameter 21-D1 and a second diameter 21-D2. The first diameter of the intake channel 21-D1 can be less than or equal to the second diameter of the intake channel 21-D2. In particular, the first diameter of the intake channel 21-D1 can be smaller than the second diameter of the intake channel 21-D2. The cross-sectional diameter of the intake channel 21-D1 should generally result in an inner diameter of at least 19 mm.

[0094] The sound damping devices 10 of the exemplary embodiments according to Fig. 3 are preferably arranged on the suction side 8 in the intake duct 21. In some embodiments, it is conceivable that such embodiments can alternatively or additionally also be arranged on the pressure side 9 in the outlet duct 41 (not shown). Figure 4 shows schematic representations of the duct wall 22, 42 with sound damping devices 10 of a further exemplary embodiment, wherein Fig. 4A shows an overview of a partial section of the duct wall 22, 42 and Fig. 4B shows a detailed view of a sound damping device 10 from Fig. 4A and Fig. 4C shows a perspective view of a partial section of the duct wall 7, 22, 42. Fig. 4 shows by way of example that the sound damping device 10 can be formed substantially within the duct wall 22, 42.

[0095] The channel wall 22 of the intake channel 21 and / or the channel wall 42 of the outlet channel 41 can be double-walled, each with an inner channel wall 22, 42 and an outer channel wall 22i, 42i. The inner channel wall 22, 44 and the outer channel wall 22i, 42i can be manufactured in one or two parts. Preferably, the inner channel wall 22, 44 and the outer channel wall 22i, 42i are manufactured or can be manufactured by at least one injection molding process. Other suitable manufacturing processes can also be provided. Preferably, the inner channel wall 22, 44 and the outer channel wall 22i, 42i are manufactured in at least two parts and subsequently connected to one another. The connection between the inner channel wall 22, 44 and the outer channel wall 22i, 42i can be irreversible or reversible.A reversible connection offers the advantage that the inner channel wall 22, 44 and the outer channel wall 22i, 42i can be separated, which facilitates cleaning, sterilization, disinfection, or the like after use. The connection of the inner channel wall 22, 44 and the outer channel wall 22i, 42i can be achieved via a plug-in system, gluing, welding, laser welding, or the like (not shown).

[0096] Fig. 4 AC shows the double-walled channel wall 22, 42, wherein the inner channel wall 22, 42 is connected to the outer channel wall 22i, 42i, thus forming the at least one sound-damping device 10. Fig. 4B shows that the inner channel wall 22, 42 can comprise the at least one channel 11 of at least one sound-damping device 10. Preferably, the channel wall 22, 42 comprises a plurality of channels 11 for a plurality of sound-damping devices 10.

[0097] The inner channel wall 22, 42 is designed and configured to substantially enclose a lumen 23, 43 of the channel 7, 21, 41. The inner channel wall 22, 42 can have at least one channel 11, which provides a respiratory gas-conducting connection between the lumen 23, 43 of the channel 7, 21, 41 and the at least one chamber 12 of the sound-damping device 10. Sound waves from the lumen 23, 43 can be guided into the chamber 12 of the sound-damping device 10 via the channel 11. The sound-damping device 10 can also have a plurality of chambers 12, in particular 2, 3, 4 or more. In the specific exemplary embodiment according to Figures 4 AC, the sound-damping device 10 has two chambers 12. The two chambers 12 can be mirror-symmetrical. In some embodiments, it is conceivable that the two chambers 12 of a sound damping device 10 have different geometric shapes (not shown).The channel 11 establishes a pneumatic connection between the lumen 23,43 and the two chambers 12.

[0098] The outer channel wall 22i, 42i can be configured and designed, in conjunction with the inner channel wall 22, 42, to provide the at least one chamber 12 of the sound-damping device 10. The outer channel wall 22i, 42i can form at least one impact element 14, 15, 16, etc. The outer channel wall 22i, 42i can form at least the first impact element 14. In addition, the outer channel wall 22i, 42i can form at least the second impact element 15 and / or the third impact element 16. The chamber 12 can, as in the exemplary embodiments according to Fig. 4A-C, have a trapezoidal basic shape with four impact elements 14, 15, 16, 17. Triangular, polygonal, round, or oval chambers 12 are also conceivable depending on the number of impact elements (not shown).

[0099] From Fig. 4 B, it can be seen that the chamber 12 has a trapezoidal basic shape and is bounded by the first impact element 14, the second impact element 15, the third impact element 16, and, in some areas, the inner channel wall 22, 42. The area of ​​the inner channel wall 22, 42 that bounds the chamber 12 can, by definition, represent a further, fourth impact element 17.

[0100] As can be seen from Fig. 4B, the arrangement of the first impact element 14 and the second impact element 15 to one another and to the channel wall 22 can be similar to that previously described for Figures 2 and 3. In this exemplary embodiment, too, the first impact element 14 (plane E2) is aligned at the first angle α1 to the channel wall 22 (plane E1). The second impact element 15 (plane E3) is aligned at the second angle α2 to the channel wall 22 (plane E1). The second impact element 15 (plane E3) is aligned at an angle β to the first impact element 14 (plane E2). The first impact element 14 and the second impact element 15 are not aligned parallel to one another. The first impact element 14 and the second impact element 15 are aligned so as to converge towards one another (see Fig. 4B).

[0101] Fig. 4B further shows that the second impact element 15 (plane E3) is oriented at a second angle a2 to the channel wall 22, 42 (plane E1). In the specific embodiment according to Fig. 4, the second angle a2 can be in a range between 40° and 160°, preferably between 80° and 140°. In the specific embodiment according to Figures 4, the second angle a2 can be 90°.

[0102] The first impact element 14 and the second impact element 15 are not aligned parallel to one another. The first impact element 14 and the second impact element 15 are aligned so as to converge (see Fig. 4B). The second impact element 15 (plane E3) is aligned at an angle ß to the first impact element 14 (plane E2), which is greater than 0°. The angle ß can be in a range between 0.1° and 90°. Preferably, the angle ß can be in a range between 0.1° and 45°, more preferably in a range between 10° and 45° inclusive. In the specific embodiment according to Figure 4, the angle ß can be 37°.

[0103] The sound-damping devices 10 can be arranged on the suction side 8 and / or the pressure side 9 and / or within the blower 3. The sound-damping devices 10 can be arranged on the suction side 8 in the duct wall 22 of the intake duct 21. Alternatively or additionally, the sound-damping devices 10 can be arranged on the pressure side 9 in the duct wall 42 of the outlet duct 41. An arrangement within the blower 3, in particular in the blower wall, is also conceivable (not shown). In particular, the sound-damping devices 10 of this embodiment can also be arranged in the chamber in which the blower is suspended (not shown). The sound-damping devices 10 in a double-walled housing can, in principle, be integrated into any housing shape. In some embodiments, all walls (side surfaces, base, and cover) can be designed with double walls and sound-damping devices 10.

[0104] The arrangement of sound dampening devices 10 according to this embodiment can, in some versions, be distributed over the entire respiratory gas-carrying channel 7. In preferred embodiments, it is also possible for only certain areas of the channel wall 13 to have such sound dampening devices 10. In particular, the sound dampening devices 10 can be arranged within the channel wall 13 where the channel 7 has bends, curves, corners, and deflection points. In these cases, the main flow of the respiratory gas can be redirected, but the sound waves still impinge on the channel wall 13, 22, 42 (see Fig. 4C). The sound waves S can then enter the channel 11 of the sound dampening device 10 and be guided into the at least one chamber 12, where they are dampened. The sound dampening devices 10 of this embodiment are preferably arranged on the suction side 8.

[0105] Figure 5 shows exemplary representations of a device inlet 20 with a sound-damping device, with Figures 5A and 5B showing a cross-section and Figure 5C showing a perspective view. The intake duct 21 is arranged adjacent to the device inlet 20.

[0106] In the intake duct 21, the sound direction R2 generally runs substantially opposite to the flow direction RI of the breathing gas. To prevent the sound waves S from reaching the device inlet 20 and from there into the environment, at least one sound-damping device 10 can be arranged in the intake duct 21 adjacent to the device inlet 20. The sound-damping device 10 is configured and designed to allow the breathing gas to reach the blower 3, while blocking the path for the sound waves to the blower outlet 20 and to the environment. Alternatively or additionally, at least one element 24, 25, 26... can be arranged in the intake duct 21 adjacent to the device inlet 20 and / or in or at the device inlet 20.

[0107] At least one filter 6 can be arranged in or at the device inlet 20, which filters the supplied breathing gas A, in particular the supplied ambient air. It is advantageous if the device inlet 20 and, accordingly, the filter size are as large as possible, so that the filter 6 is as durable as possible, does not clog as quickly, and does not need to be replaced as frequently. A pleated filter or a filter system with several filters arranged one behind the other can also be advantageous (not shown).

[0108] Fig. 5B shows the diameters of the device inlet 20 and the intake duct 21. The device inlet 20 has a diameter 20-D. The filter 6 has at least the size of the diameter 20-D; preferably, the filter is larger than the diameter 20-D of the device inlet 20 (not shown). The intake duct 21 has a diameter 21-D. The diameter of the intake duct 21-D can be constant or variable. In preferred embodiments, the intake duct 21 can have variable diameters 21-D1, 21-D2, ... (see Figs. 3A, 5B). For this purpose, elements 24, 25, 26... can be arranged in or on the device inlet 20, which elements can be configured and designed to influence the diameter of the intake duct 21-D.

[0109] The diameter of the device inlet 20-D is at least equal to the diameter of the intake channel 21-D. In preferred embodiments, the diameter of the device inlet 20-D is larger than the diameter of the intake channel 21-D. In one embodiment, the diameter of the device inlet 20-D can be at least 1.1 times the diameter of the intake channel 21-D, preferably at least 1.5 times the diameter, particularly preferably at least 2 times the diameter. In some embodiments, the diameter of the device inlet 20-D can be at least 3 times the diameter, preferably at least 4 times the diameter, particularly preferably at least 6 times the diameter of the intake channel 21-D.

[0110] In some embodiments, as shown by way of example in Fig. 5 AC, at least one, preferably several, elements 24, 25, 26 can be arranged in or at the device inlet 20. The elements 24, 25, 26 can be configured and designed to influence the flow of the respiratory gas. In particular, the elements 24, 25, 26 can be configured and designed to redirect the flow of the respiratory gas.

[0111] The elements 24, 25, 26 can also be designed and configured to influence the sound waves. In particular, the elements 24, 25, 26 can be designed and configured to redirect and / or restrict and / or block the path for sound waves. In particular, the elements 24, 25, 26 can also be designed and configured to change the diameter of the intake channel 21-D. The diameter of the intake channel 21-D can be variable in the exemplary embodiment according to Fig. 5A-C. It can be seen from Fig. 5B that the intake channel 21 can have at least a first diameter 21-D1 and a second diameter 21-D2. The diameter of the device inlet 20-D is generally larger than the first diameter of the intake channel 21-D1. The first diameter of the intake channel 21-D1 can be smaller than or equal to the second diameter of the intake channel 21-D2.Preferably, the first diameter of the intake channel 21-D1 is smaller than the second diameter of the intake channel 21-D2.

[0112] From Fig. 5A, it is clear that the channel 7, in particular the intake channel 21, does not have to be straight. The intake channel 21 preferably has at least one, preferably several, deflection points. Through multiple deflections, the breathing gas is guided along a longer path through the housing. In the exemplary embodiment according to Fig. 5, a first deflection of the breathing gas is formed directly at the device inlet 20. The breathing gas can be drawn in from the environment and initially deflected by, for example, 90° upon entering the intake channel 21. The sound waves, however, are not initially deflected but enter the channel 11 of the sound-damping device 10 (see Fig. 5A). The channel 11 is designed and configured to guide the sound waves S to the first impact element 14 and / or into the chamber 12. The elements 24, 25, 26...can also be configured to form and / or extend the channel 11 leading to the sound-damping device 10. In particular, the first element 24 is configured and designed to form and / or extend the channel 11. The first element 24 can also be configured and aligned to further impede and / or block the path of the sound waves to the device inlet 20.

[0113] From Fig. 5A, it can be seen that the chamber 12 of the sound-damping device 10 can have a substantially round basic shape. Oval, spiral, helical, polygonal, or other basic shapes are also possible. The chamber 12 is not closed. The chamber 12 is pneumatically connected to the intake channel 21 via the channel 11.

[0114] In the embodiments with round chambers 12, the first impact element 14, the second impact element 15, the third impact element 16 ... can be designed in one piece and as a single curved impact element 18. Due to the round design of the chamber 12, the one curved impact element 18 can thus combine the function of the first, second, third, fourth ... impact elements 14, 15, 16, 17... (see Fig. 5A).

[0115] The curved impact element 18 can be curved such that sound waves S passing from the channel 11 into the chamber 12 are reflected multiple times by the curved impact element 18. The reflection of the sound waves reduces and / or absorbs and / or dampens and / or insulates and / or superimposes the sound.

[0116] The curved impact element 18 can be curved such that the sound waves are reflected multiple times. The sound waves coming from the channel 11 initially strike the curved impact element 18. The curved impact element 18 is designed and configured to reflect the sound waves. The curved impact element 18 is oriented such that the sound waves S are reflected multiple times by the curved impact element 18. Thus, the sound waves S can essentially remain within the chamber 12. The curved impact element 18 is designed such that the sound waves are reflected at least twice, preferably at least four times, particularly preferably at least six times, in particular ten times or more often. The sound waves are preferably reflected an infinite number of times without re-entering the channel 11.This is preferably achieved by the curved impact element 18 not forming a uniform circle, and thus the chamber 12 is not circular. The radius of curvature of the curved impact element 18 is therefore preferably not constant.

[0117] Although the present invention has been described in detail with reference to the exemplary embodiments, it will be understood by those skilled in the art that the invention is not limited to these exemplary embodiments. Rather, modifications are possible in such a way that individual features are omitted or other combinations of the described individual features can be implemented, provided the scope of the appended claims is not exceeded. The present disclosure includes all combinations of the presented individual features. List of reference symbols

[0118] A breathing gas

[0119] D Diameter

[0120] El, E2, E3... Level

[0121] L length

[0122] R1 Flow direction of breathing gas

[0123] R2 Sound direction

[0124] S sound waves

[0125] 1 ventilator

[0126] 2 housings

[0127] 3 Breathing gas source / blower

[0128] 4 Control device

[0129] 5 connection unit

[0130] 6 filters

[0131] 7 channel

[0132] 8 Suction side

[0133] 9 Print page

[0134] 10 Soundproofing device

[0135] 11 Channel

[0136] 12 chambers

[0137] 13 Canal wall

[0138] 14 First impact element

[0139] 15 Second impact element

[0140] 16 Third impact element

[0141] 17 Fourth impact element

[0142] 18 Curved impact element

[0143] 19 Opening

[0144] 20 device input

[0145] 20-D diameter of the device inlet

[0146] 21 Intake duct

[0147] 21-D Diameter of the intake duct

[0148] 22 (Inner) channel wall 22i Outer channel wall

[0149] 23 lumens

[0150] 24 First Element

[0151] 25 Second Element

[0152] 26 Third Element

[0153] 40 Device output

[0154] 41 Exhaust channel

[0155] 42 (Inner) Canal Wall

[0156] 42i Outer channel wall

[0157] 43 lumens

[0158] 44 jetty

[0159] 45 First Section

[0160] 46 Second Section

[0161] 47 Third section a, ß, Y angles

Claims

Patent claims 1. A ventilator 1 comprising at least one sound attenuation device 10, wherein the ventilator 1 comprises a housing 2 with at least one device inlet 20 and at least one device outlet 40, as well as at least one channel 7 for conducting respiratory gas A, wherein the channel 7 is formed between the device inlet 20 and the device outlet 40, wherein at least one respiratory gas source 3 for generating a respiratory gas flow RI is arranged in or on the channel 7, so that the channel 7 comprises at least one suction side 8 with an intake channel 21 and at least one pressure side 9 with an outlet channel 41, wherein the respiratory gas flow RI in the intake channel 21 leads from the device inlet 20 to the respiratory gas source 3, and sound waves S run in a sound direction R2 from the respiratory gas source 3 towards the device inlet 20 and thus opposite to the flow direction RI,and wherein the respiratory gas flow RI in the outlet channel 41 leads from the respiratory gas source 3 to the device outlet 40 and sound waves S run in a sound direction R2 from the respiratory gas source 3 in the direction of the device outlet 40 and thus equal to the flow direction RI, characterized in that the sound damping device 10 is arranged on the suction side 8 in or on the intake channel 21 and / or on the pressure side 9 in or on the outlet channel 41, wherein the sound damping device 10 is set up and designed to dampen sound waves S that run concurrently with and / or opposite to the flow direction RI of the respiratory gas.

2. Ventilator 1 according to one of the preceding claims, characterized in that the intake channel 21 and / or the outlet channel 41 comprises at least one, preferably at least two, particularly preferably a plurality of sound damping devices 10.

3. Ventilator 1 according to one of the preceding claims, characterized in that the sound dampening device 10 comprises at least one chamber 12 with at least one opening 19, via which the chamber 12 is pneumatically coupled to the channel 7 such that at least a portion of the respiratory gas A conducted through the channel 7 flows into the chamber 12; wherein the chamber 12 comprises at least one impact element 14, 15, 16, 17, 18, which is configured and designed to repeatedly reflect sound waves S entering the chamber 12.

4. Ventilator 1 according to one of the preceding claims, characterized in that the impact elements 14, 15, 16, 17, 18 are designed or arranged such that sound waves S entering the chamber 12 are reflected at least twice, preferably at least four times, particularly preferably at least six times, in particular ten times or more often.

5. Ventilator 1 according to one of the preceding claims, characterized in that the chamber 12 comprises at least one curved impact element 18 and / or that the chamber 12 comprises at least a first impact element 14 and a second impact element 15, which are aligned at an angle ß to one another.

6. Ventilator 1 according to one of the preceding claims, characterized in that the chamber 12 has a basic geometric shape selected from the group: round, oval, angular, trapezoidal, triangular, square, polygonal.

7. Ventilator 1 according to one of the preceding claims, characterized in that the curved impact element 18 encloses the chamber 12 such that the chamber 12 is substantially round or oval and has an opening 19 for pneumatic connection to the channel 7.

8. Ventilator 1 according to one of the preceding claims, characterized in that the radius of curvature of the curved impact element 18 is not constant.

9. Ventilator 1 according to one of the preceding claims, characterized in that the angle ß is greater than 0°, wherein the angle ß is preferably in a range from 0.1° up to and including 90°, more preferably in a range between 5° and 70° inclusive, in particular in a range between 15° and 45°.

10. Ventilator 1 according to one of the preceding claims, characterized in that the intake channel 21 has a channel wall 22 which encloses a lumen 23 of the intake channel and that the outlet channel 41 has a channel wall 42 which encloses a lumen 43 of the outlet channel.

11. Ventilator 1 according to one of the preceding claims, characterized in that the first impact element 14 is aligned at a first angle a1 to the channel wall 22, 42, wherein the first angle a1 is greater than 0° and less than 180°, wherein the first angle a1 is preferably in a range between 90° and 180° inclusive, particularly preferably in a range between 90° and 160° inclusive, more preferably in a range between 100° and 140°, in particular in a range between 110° and 130°.

12. Ventilator 1 according to one of the preceding claims, characterized in that the second impact element 15 is aligned at a second angle a2 to the channel wall 22, 42, wherein the second angle a2 is greater than 0° and less than 180°, wherein the second angle a2 is preferably in a range between 20° and 180°, more preferably in a range between 60° and 160°, in particular in a range between 80° and 140°.

13. Ventilator 1 according to one of the preceding claims, characterized in that the first angle a1 and the second angle a2 are preferably of different sizes, wherein the deviation between the first angle a1 and the second angle a2 is more than 0.1°, particularly preferably more than 5°, more preferably more than 10°.

14. Ventilator 1 according to one of the preceding claims, characterized in that the sound waves S are deflected by reflection at the impact elements 14, 15, 16, 17, 18 such that the sound direction R2 is at an angle y to the flow direction RI of the respiratory gas, wherein the angle y is in a range between 50° and 130°, preferably in a range between 70° and 110°, more preferably in a range between 80° and 100°.

15. Ventilator 1 according to one of the preceding claims, characterized in that the impact elements 14, 15, 16, 17, 18 are preferably arranged relative to one another such that the sound direction R2 is at an angle y to the flow direction RI of the respiratory gas, which angle is approximately 90°.

16. Ventilator 1 according to one of the preceding claims, characterized in that the channel wall 22 of the intake channel 21 and / or the channel wall 42 of the outlet channel 41 is double-walled with an inner channel wall 22,42 and an outer channel wall 22i,42i.

17. Ventilator 1 according to one of the preceding claims, characterized in that the inner channel wall 22,42 and the outer channel wall 22i,42i can be connected to one another irreversibly or reversibly, preferably reversibly.

18. Ventilator 1 according to one of the preceding claims, characterized in that the sound damping device 10 comprises a channel 11, wherein the channel 11 is formed in the inner channel wall 22, 42 and is arranged to provide a pneumatic connection between the channel 7 of the ventilator and the chamber 12.

19. Ventilator 1 according to one of the preceding claims, characterized in that the outer channel wall 22i, 42i is configured, in conjunction with the inner channel wall 22, 42, to form the at least one chamber 12 of the sound damping device 10, wherein the outer channel wall 22i, 42i comprises the at least one impact element 14, 15, 16, 17, 18.

20. Ventilator 1 according to one of the preceding claims, characterized in that the chamber 12 is closed at least on two sides by the first impact element 14 and the second impact element 15, wherein the impact elements 14, 15 are arranged opposite one another, wherein the chamber 12 has two openings 19i, 19ii.

21. Ventilator 1 according to one of the preceding claims, characterized in that the openings 19i, 19ii are designed such that the respiratory gas flows in the flow direction RI through the first opening 19i into the chamber 12 and flows out of the chamber 12 through the second opening 19ii, wherein the impact elements 14, 15 are aligned with one another such that the sound waves are separated from the main flow of the respiratory gas by reflection at the first impact element 14 and remain in the chamber 12.

22. Ventilator 1 according to one of the preceding claims, characterized in that at least one web 44, preferably at least two, three, four, five, six or more webs 44 are arranged in the lumen 43 of the outlet channel 41.

23. Ventilator 1 according to one of the preceding claims, characterized in that the webs 44 divide the outlet channel 21 at least in sections lengthwise in such a way that the outlet channel 21 is at least in sections divided into sub-channels 11, wherein a sub-channel 11 is formed between each two webs 44 and / or between the channel wall 42 and a web 44.

24. Ventilator 1 according to one of the preceding claims, characterized in that the webs 44 are designed such that in the sub-channels 11 at least one chamber 12 enclosed on two sides is formed with the one first impact element 14 and the one second impact element 15 and the two openings 19i, 19ii.

25. Ventilator 1 according to one of the preceding claims, characterized in that the chamber 12 comprises at least one third impact element 16, wherein the chamber 12 is closed on three sides at least by the first impact element 14 and the second impact element 15 and the third impact element 16 such that the chamber 12 has only one opening 19.

26. Ventilator 1 according to one of the preceding claims, characterized in that the first impact element 14 is arranged at least partially in the lumen 23 of the intake channel 21 and is designed to deflect at least the sound waves S from the intake channel 21 in such a way that they reach the chamber 12.

27. Ventilator 1 according to one of the preceding claims, characterized in that in the intake channel 21 adjacent to the device inlet 20 and / or in or at the device inlet 20 at least one element 24, 25, 26... is arranged, which is configured to redirect and / or restrict and / or block the sound direction R2, wherein the elements 24, 25, 26... are in particular configured and designed to guide the sound waves into the sound damping device 10.

28. A sound dampening device 10 for a ventilator 1 having at least one channel 7 for conducting respiratory gas A, wherein the sound dampening device 10 comprises: at least one chamber 12 having at least one opening 19, via which the chamber 12 is pneumatically coupled to the channel 7 such that at least a portion of the respiratory gas A conducted through the channel 7 flows into the chamber 12; wherein the chamber 12 comprises at least one impact element 14, 15, 16, 17, 18, characterized in that the impact element 14, 15, 16, 17, 18 is configured and designed to repeatedly reflect sound waves S entering the chamber 12.

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