A silencer

Abstract

The present invention discloses a silencer device, comprising an air duct module, a blower, and a silencer module. The air duct module includes a cavity with an air inlet and an air outlet provided on the cavity. The blower is installed in the cavity of the air duct module, and the air outlet of the blower is connected to the silencer module. The silencer module is provided with one or more chambers, and the pipe cross-section of the chamber is larger than the air outlet cross-section of the blower. When gas enters the silencer module, sound waves enter the silencer module from the same direction. Due to the sudden expansion of the pipe cross-section, the sound impedance inside the channel suddenly changes, and the propagation direction of the sound waves suddenly changes, causing reflection and interference in the chamber, thereby achieving the purpose of silencer.

Description

Technical Field

[0001] The present invention belongs to the field of medical devices, and in particular relates to a silencer for a continuous positive airway pressure device. Here, its application in a continuous positive airway pressure treatment device is described, but it should be understood that the features of the present invention will include applications in other fields. Background Art

[0002] Continuous positive airway pressure (CPAP) devices typically include a blower, which creates negative pressure inside the device through the high-speed rotation of its internal fan blades. External air is continuously supplied through the air inlet. After entering the CPAP device through the air inlet, the air first passes through a section of airway before reaching the chamber where the blower is located. The blower then delivers the air to the patient through a humidifier or directly to the patient. The noise generated by the CPAP device during operation is primarily due to the two reasons mentioned above: the broadband noise generated by the blower itself during operation, and the wind noise generated by the air passing through the air duct.

[0003] Since continuous positive airway pressure therapy equipment is mostly used at night, if there is a continuous high-decibel noise, it will affect the user's sleep quality. Therefore, it is necessary to design a noise reduction device to improve the user experience. Summary of the Invention

[0004] In response to the above technical problems, the present invention designs a silencer for continuous positive airway pressure therapy equipment.

[0005] The technical solution adopted in the present invention is:

[0006] A silencer device mainly comprises an air duct module, a blower and a silencer module.

[0007] The air duct module includes an air duct body in the form of a cavity, on which an air inlet end and an air outlet end are arranged. The blower is installed in the air duct body, and the air outlet of the blower is connected to the silencer module. The silencer module is provided with one or more chambers, and the pipe cross-section of the chamber is larger than the air outlet cross-section of the blower.

[0008] Furthermore, the chamber of the silencer module is separated by a partition with openings.

[0009] Furthermore, the silencer module is assembled inside the humidification tank, and the air outlet of the silencer module leads to the interior of the humidification tank.

[0010] Furthermore, the air outlet of the humidification tank is arranged on the upper cover of the humidification tank.

[0011] Furthermore, one end of the air outlet of the air duct module is connected to the air outlet of the blower, and the other end is connected to the air inlet of the silencer module.

[0012] As a preferred embodiment, the blower and the silencer module are both arranged in the air duct body, and the air outlet of the silencer module is installed at the air outlet end of the air duct module.

[0013] Furthermore, in the above-mentioned silencer device, the air outlet of the blower and the air inlet of the silencer module are sealed by a silicone ring.

[0014] When the gas enters the silencer module, the sound waves enter the silencer module from the same direction. Due to the sudden expansion of the pipe cross-section, the sound impedance inside the channel suddenly changes, and the propagation direction of the sound waves suddenly changes, causing reflection and interference in the chamber, thereby achieving the purpose of noise elimination.

[0015] The present invention has the following beneficial effects: the present invention can reduce the noise generated during the operation of the continuous positive airway pressure treatment device and improve the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is an assembly diagram of the silencer module and the air duct module according to an embodiment of the present invention.

[0017] Figure 2 1 is an exploded view of the silencer module and the air duct module according to an embodiment of the present invention.

[0018] Figure 3 2 is a cross-sectional view of the components of the muffler module and the air duct module according to an embodiment of the present invention.

[0019] Figure 4 This is an assembly diagram of the silencer module according to an embodiment of the present invention disposed inside the humidification tank.

[0020] Figure 5 This is an exploded view of the silencer module of an embodiment of the present invention disposed inside the humidification tank.

[0021] Figure 6 This is a cross-sectional view of a component in which the silencer module according to an embodiment of the present invention is disposed inside a humidification tank.

[0022] Figure 7 This is an assembly diagram of the silencer module according to an embodiment of the present invention disposed inside the air duct module.

[0023] Figure 8 This is an exploded view of the silencer module of an embodiment of the present invention disposed inside the air duct module.

[0024] Figure 9 This is a cross-sectional view of a component in which a noise reduction module is disposed inside an air duct module according to an embodiment of the present invention. DETAILED DESCRIPTION

[0025] To facilitate understanding by those skilled in the art, the present invention is further described below with reference to embodiments and accompanying drawings.

[0026] Example 1: Figure 1 The figure shows the assembly diagram of the air duct module and the silencer module 3. Figure 2 Shown is an exploded view of the air duct module and the silencer module 3.

[0027] The air duct module includes a duct main body 1 and an air duct cover 4. The air duct main body 1 is a cavity, and an air inlet end 5 and an air outlet end 11 are set on the air duct main body 1. The blower 2 is installed in the air duct main body 1, and the air outlet of the blower 2 is connected to the silencer module 3. One or more chambers are set in the silencer module 3, and the pipe cross-section of the chamber is larger than the air outlet cross-section of the blower 2.

[0028] The chambers of the silencer module 3 are cylindrical and arranged in parallel in four groups, namely the first chamber 3-1, the second chamber 3-2, the third chamber 3-3, and the fourth chamber 3-4. The chambers are separated by partitions with openings.

[0029] One end of the air outlet end 11 of the air duct module is connected to the air outlet of the blower 2 , and the other end is connected to the air inlet of the silencer module 3 .

[0030] The air outlet of the blower 2 and the air inlet of the silencer module 3 are sealed by a silicone ring 7 .

[0031] like Figure 3 The figure shows a cross-sectional view, in which the gas is sucked into the air duct body 1 through the air inlet on the top of the air duct module and the air duct upper cover 4, while the air inlet of the blower 2 is set at the bottom.

[0032] The high-speed rotation of the blades inside blower 2 creates negative pressure, sucking in air from the bottom air inlet and outputting it to silencer module 3. Silencer module 3 is equipped with one or more chambers. When gas enters silencer module 3, sound waves enter from the same direction. The sudden expansion of the pipe cross-section causes a sudden change in the acoustic impedance inside the channel, and the propagation direction of the sound waves suddenly changes, causing reflection and interference within the chamber, thereby achieving the purpose of noise reduction.

[0033] Example 2: Figures 4 to 6 This is an implementation scheme in which the silencer module 3 is assembled inside the humidification tank, and the rest is the same as in Example 1. Figure 5 The figure shows an exploded view of the humidifier, which includes an air duct body 1, an air duct cover 4, a blower 2, a silicone ring 7, a humidifier cover 9, a silencer module 3, and a humidifier body 8. The silencer module 3 is assembled inside the humidifier, and the air outlet 6 of the silencer module 3 is connected to the interior of the humidifier body 8. The humidifier air outlet 10 is provided on the humidifier cover 9.

[0034] like Figure 6The cross-sectional view shows the high-speed rotation of the blades inside the blower 2, which generates negative pressure. Gas is drawn into the air duct body 1 through the air inlet. The blower 2 then draws the gas in and outputs it to the muffler module 3, which is located within the humidifier tank body 8. The muffler module 3 is provided with one or more chambers. When gas enters the muffler module 3, sound waves enter the muffler module 3 from the same direction. The sudden expansion of the duct cross-section causes a sudden change in the acoustic impedance inside the channel, resulting in a sudden change in the propagation direction of the sound waves, which then reflect and interfere within the chambers, thereby achieving the purpose of muffler.

[0035] Example 3: Figures 7 to 9 This is an implementation scheme in which the silencer module 3 is assembled inside the air duct module. The blower 2 and the silencer module 3 are both arranged in the air duct body 1 of the air duct module, and the air outlet 6 of the silencer module 3 is installed at the air outlet end 11 of the air duct module. Figure 8 Shown is an exploded view.

[0036] like Figure 9 The cross-sectional view shows the high-speed rotation of the blades inside blower 2, which generates negative pressure. Gas is drawn into the air duct body 1 through the air inlet. The blower 2 then outputs the inhaled gas to the silencer module 3. The silencer module 3 is provided with one or more chambers. When gas enters the silencer module 3, sound waves enter the silencer module 3 from the same direction. The sudden expansion of the duct cross-section causes a sudden change in the acoustic impedance inside the channel, and the propagation direction of the sound waves suddenly changes, causing reflection and interference within the chambers, thereby achieving the purpose of noise reduction.

[0037] The above embodiments are only for illustrating the technical idea of ​​the present invention and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the present invention.

Claims

1. A silencer, characterized in that: Including air duct module, blower, and silencer module; The air duct module includes a cavity-shaped air duct body, an air inlet end and an air outlet end are set on the air duct body, a blower is installed in the air duct body, and the air outlet of the blower is connected to the silencer module. The silencer module is provided with multiple chambers, and the pipe cross-section of the chamber is larger than the air outlet cross-section of the blower. The muffler module includes an air inlet and an air outlet. A plurality of baffles with openings are provided in the muffler module. The baffles are arranged in parallel in the direction of gas flow to form a plurality of chambers connected in series. The air outlet of the blower is coaxially arranged with the air inlet, chamber and air outlet of the muffler module. The axial direction of the air outlet of the blower is perpendicular to the baffles. The silencer module is assembled inside the humidification tank, and the air outlet of the silencer module leads to the interior of the humidification tank; or The blower and the silencer module are both arranged in the air duct body, and the air outlet of the silencer module is installed at the air outlet end of the air duct module.

2. The silencing device according to claim 1, characterized in that: The air outlet of the humidification tank is arranged on the upper cover of the humidification tank.

3. The silencing device according to claim 1 or 2, characterized in that: One end of the air outlet of the air duct module is connected to the air outlet of the blower, and the other end is connected to the air inlet of the silencer module.

4. The silencing device according to claim 3, characterized in that: The air outlet of the blower and the air inlet of the silencer module are sealed with a silicone ring.

5. The silencing device according to claim 1 or 2, characterized in that: The air outlet of the blower and the air inlet of the silencer module are sealed with a silicone ring.

6. The silencing device according to claim 1, characterized in that: The air outlet of the blower and the air inlet of the silencer module are sealed with a silicone ring.

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