Noise-canceling apparatus and ventilation treatment device

Abstract

The present application relates to the field of ventilation treatment devices, and particularly, to a noise-canceling apparatus and a ventilation treatment device. The noise-canceling apparatus comprises a housing and a blower. At least two air chambers are formed in the housing, and the blower is arranged in one of the air chambers. The housing is provided with an air inlet and an air outlet, and at least two air channels are provided between the air inlet and the air outlet, such that the airflow flows to the air outlet from the air inlet via the air channels. The at least two air chambers are in communication via the air channels, and the lengths of the air channels are different.

Description

Noise reduction devices and ventilation therapy equipment

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the China Patent Office on December 29, 2023, with application number 202311866077.2, and application name “Noise Reduction Device and Ventilation Therapy Equipment”, all contents of which are incorporated by reference into this application. Technical Field

[0003] The present application belongs to the field of ventilation therapy equipment, and specifically relates to a noise reduction device and ventilation therapy equipment. Background Art

[0004] With the advancement of technology and the improvement of medical standards, the application of ventilation therapy equipment has become increasingly widespread. For example, in hospitals, patients wear respiratory masks connected to ventilation therapy equipment, which injects therapeutic gas into the masks. For another example, patients with severe snoring can receive treatment through the use of ventilation therapy equipment. Ventilation therapy equipment is typically equipped with a fan, which circulates gas when in operation. However, the noise generated by the fan is high, affecting the patient's sleep quality and resulting in a poor experience for the patient using the ventilation therapy equipment.

[0005] Summary of the Invention

[0006] The purpose of some embodiments of the present application is to provide a noise reduction device and a ventilation therapy device, which at least solves the problem that the fan generates a large amount of noise, affects the patient's sleep quality, and causes the patient to have a poor experience in using the ventilation therapy device.

[0007] In a first aspect, some embodiments of the present application provide a noise reduction device, the noise reduction device comprising: a housing and a fan;

[0008] At least two gas chambers are provided in the housing, and the fan is placed in one of the gas chambers;

[0009] An air inlet and an air outlet are provided on the shell, and at least two gas channels are provided between the air inlet and the air outlet so that the air flow flows from the air inlet to the air outlet through the gas channel. At least two gas chambers are connected through the gas channel, and the path lengths of each gas channel are different.

[0010] Optionally, the path length of the gas channel is determined according to the frequency of the noise.

[0011] Optionally, the difference between the first target gas channel and the second target gas channel is an odd multiple of half the wavelength of the noise generated by the blower, so that the noise is weakened when flowing through the first target gas channel and the second target gas channel to the air inlet;

[0012] The first target gas channel is at least a portion of any one of the at least two gas channels, and the second target gas channel is at least a portion of any one of the remaining gas channels.

[0013] A plurality of gas chambers are sequentially spaced apart in the shell;

[0014] At least two adjacent gas chambers among the multiple gas chambers are connected through at least two gas pipelines, and any one of the at least two gas pipelines forms at least a portion of the first target gas channel, and any one of the remaining gas pipelines forms at least a portion of the second target gas channel.

[0015] Optionally, a plurality of gas chambers are sequentially spaced apart and distributed in the housing;

[0016] In at least two adjacent gas chambers, any one gas chamber has a plurality of inlets and an outlet;

[0017] The space between any one of the plurality of inlets and the outlet forms part of the first target gas channel, and the space between any one of the remaining inlets and the outlet forms part of the second gas channel.

[0018] Optionally, a plurality of gas chambers are sequentially adjacent in the housing;

[0019] Among the multiple gas chambers, at least one gas chamber has multiple inlets and one outlet, the space between any one of the multiple inlets and the outlet forms a first target gas channel, and the space between any one of the remaining inlets and the outlet forms a second gas channel.

[0020] Optionally, at least two non-adjacent gas chambers among the multiple gas chambers are connected through at least one gas pipeline, and the at least one gas pipeline forms a portion of the first target gas channel.

[0021] Optionally, a sound absorbing member is provided in the gas pipeline.

[0022] Optionally, a sound absorbing member is provided on a cavity wall of at least one gas chamber.

[0023] Optionally, the noise reduction device includes an upper shell, a lining, a middle shell, and a lower shell;

[0024] The upper shell, the middle shell, and the lower shell are sequentially connected to form a cavity, the liner is located in the cavity, the lower shell and the middle shell enclose a first gas chamber, the liner and the upper shell enclose a second gas chamber, and the liner and the middle shell enclose a third gas chamber. The fan is located in the third gas chamber, the first gas chamber is communicated with the second gas chamber, and the second gas chamber is communicated with the third gas chamber;

[0025] The first gas chamber is connected to the second gas chamber through at least one gas channel, and the second gas chamber is connected to the third gas chamber through at least one gas channel; the air inlet is located on the lower shell, and the air outlet is located on the middle shell.

[0026] Optionally, the third gas chamber is connected to the first gas chamber through at least one gas channel.

[0027] In a second aspect, some embodiments of the present application provide a ventilation therapy device, which includes the noise reduction device of any one of the above-mentioned first aspects.

[0028] In some embodiments of the present application, since the multiple gas chambers in the shell are connected in sequence, at least two gas chambers are connected through a gas channel. Therefore, once the gas enters a gas chamber through the air inlet, the gas can be transferred from the gas chamber to other gas chambers through the gas channel until the gas is transferred to the gas chamber connected to the air outlet and finally flows out from the air outlet. Since the fan is located in a gas chamber connected to the air outlet, and the exhaust end of the fan is connected to the air outlet, when the fan is running, the fan can suck the gas into the gas chamber connected to the air outlet through the air inlet, and the gas flows in each gas chamber, and then the gas enters the gas chamber accommodating the fan, and then the gas enters the air inlet end of the fan, and the gas flows through the fan and flows out from the exhaust end of the fan, that is, the gas flows out from the air outlet. The noise generated when the fan is running will be transmitted from the gas chamber accommodating the fan to the gas chamber connected to the air inlet, that is, from the gas chamber accommodating the fan to the air inlet. In the process of noise transmission, the noise passes through multiple gas chambers through the gas channel, and the path lengths of each gas channel are different, so that when the noise is finally transmitted to the air inlet, the noise will interfere with each other, so that the noise transmitted to the air inlet is weakened. In addition, in the process of noise transmission, the gas chamber can weaken the noise, and also make the noise smaller when the noise is transmitted to the gas outlet. That is, in some embodiments of the present application, by setting up multiple gas chambers, at least two gas chambers are connected through a gas channel, and the fan is located in the gas chamber connected to the air outlet, so that when the fan is running, the noise reduction device can inhale gas without affecting the transmission of gas, and the noise generated by the fan is transmitted to the gas chamber through the gas channel and finally to the air inlet. The noise interferes with each other, so that the noise transmitted to the air inlet is smaller, so that the noise heard by the patient is smaller, which is conducive to improving the patient's sleep and thus improving the patient's usage experience.

[0029] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0031] FIG1 shows one of the schematic diagrams of a noise reduction device provided by some embodiments of the present application;

[0032] FIG2 shows a second schematic diagram of a noise reduction device provided by some embodiments of the present application;

[0033] FIG3 shows a third schematic diagram of a noise reduction device provided by some embodiments of the present application;

[0034] FIG4 shows one of the cross-sectional views of a noise reduction device provided by some embodiments of the present application;

[0035] FIG5 shows a second cross-sectional view of a noise reduction device provided by some embodiments of the present application;

[0036] FIG6 shows a third cross-sectional view of a noise reduction device provided in some embodiments of the present application;

[0037] FIG7 shows a fourth cross-sectional view of a noise reduction device provided by some embodiments of the present application.

[0038] Reference numerals:

[0039] 10: Shell; 11: Upper shell; 12: Liner; 13: Middle shell; 14: Lower shell; 101: Air inlet; 102: Air outlet; 103: Gas chamber; 110: First gas chamber; 120: Second gas chamber; 130: Third gas chamber; 1031: Inlet; 1032: Outlet; 20: Fan; 30: Gas channel; 40: Sound absorbing component. DETAILED DESCRIPTION

[0040] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly refer to one or more of the features. Throughout the description of this application, unless otherwise specified, "plurality" means two or more. Furthermore, "and / or" in the specification and claims refers to at least one of the connected entities, and the character " / " generally indicates an "or" relationship between the connected entities.

[0041] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0042] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0043] As shown in FIG. 1 to FIG. 7 , the noise reduction device includes a housing 10 and a fan 20 .

[0044] At least two gas chambers 103 are provided in the shell 10, and the fan is placed in one of the gas chambers 103; an air inlet 101 and an air outlet 102 are provided on the shell 10, and at least two gas channels are provided between the air inlet 101 and the air outlet 102 so that the air flow flows from the air inlet 101 to the air outlet 102 through the gas channel. At least two gas chambers 103 are connected by the gas channel, and the path lengths of each gas channel are different.

[0045] In addition, in some embodiments of the present application, one gas chamber 103 among the multiple gas chambers 103 is connected to the air inlet 101, and another gas chamber 103 is connected to the air outlet 102. The fan 20 is located in the gas chamber 103 connected to the air outlet 102, and the exhaust end of the fan 20 is connected to the air outlet 102; when the fan 20 is running, the noise generated by the fan 20 is transmitted from the gas chamber 103 accommodating the fan 20 to the air inlet 101, and the gas chamber 103 reduces the noise.

[0046] In some embodiments of the present application, since there are multiple gas chambers 103 in the shell 10, at least two gas chambers 103 are connected through a gas channel. Therefore, once the gas enters a gas chamber 103 through the air inlet 101, the gas can be transferred from the gas chamber 103 to other gas chambers 103 through the gas channel until the gas is transferred to the gas chamber 103 connected to the air outlet 102, and finally flows out from the air outlet 102. Since the fan 20 is located in the gas chamber 103 connected to the gas outlet 102, and the exhaust end of the fan 20 is connected to the gas outlet 102, when the fan 20 is running, the fan 20 can suck the gas into the gas chamber 103 connected to the gas inlet 101 through the air inlet 101, and the gas flows in each gas chamber 103, and then the gas enters the gas chamber 103 accommodating the fan 20, and then the gas enters the air inlet end of the fan 20, and the gas flows through the fan 20 and flows out from the exhaust end of the fan 20, that is, the gas flows out from the gas outlet 102, and the fan 20 The noise generated during operation will be transmitted from the gas chamber 103 accommodating the fan 20 to the gas chamber 103 connected to the air inlet 101, that is, from the gas chamber 103 accommodating the fan 20 to the air inlet 101. During the noise transmission process, the noise passes through multiple gas chambers 103 through the gas channel, and the path lengths of each gas channel are different, so that when the noise is finally transmitted to the air inlet 101, the noise will interfere with each other, so that the noise transmitted to the air inlet 101 is weakened. In addition, during the noise transmission process, the gas chamber 103 can weaken the noise, and can also make the noise smaller when the noise is transmitted to the gas outlet 1032. That is, in some embodiments of the present application, by setting up multiple gas chambers 103, at least two gas chambers 103 are connected through a gas channel, so that when the fan 20 is running, the noise reduction device can inhale gas without affecting the transmission of the gas, and the noise generated by the fan 20 is transmitted to the gas chamber 103 through the gas channel and finally transmitted to the air inlet 101. The noise interferes with each other, so that the noise transmitted to the air inlet 101 is smaller, and the noise heard by the patient is smaller, which is conducive to improving the patient's sleep and thus improving the patient's usage experience.

[0047] It should be noted that when the noise reduction device provided in some embodiments of the present application is applied to a ventilation therapy device, once the blower 20 is running, the blower 20 can draw gas into the air inlet 101 of the noise reduction device, so that the gas flows in multiple gas chambers 103, and then the gas flows out from the air outlet 102 to the patient. The noise generated by the blower 20 is in the opposite direction of the gas flow, that is, the noise generated by the blower 20 is transmitted from the gas chamber 103 containing the blower 20 to the air inlet 101, and then the noise is heard by the patient. In some embodiments of the present application, by providing multiple gas chambers 103, the noise is weakened by the gas chambers 103, so that the noise transmitted to the air inlet 101 is smaller, making the noise heard by the patient smaller, which is conducive to improving the patient's sleep.

[0048] In addition, in some embodiments of the present application, the path length of the gas channel is determined based on the frequency of the noise. Specifically, the path length of the gas channel can be determined based on the maximum noise frequency, and then the gas path length can be determined based on the half-wavelength of the maximum noise. Of course, after determining the maximum noise based on the frequency of the noise, the gas path length can also be determined based on the half-wavelength of non-maximum noise. This is not limited in the embodiments of the present application.

[0049] In addition, in some embodiments of the present application, the difference between the first target gas channel and the second target gas channel is an odd multiple of half the wavelength of the noise generated by the fan 20, so that the noise is weakened when it flows through the first target gas channel and the second target gas channel to the air inlet; wherein, the first target gas channel is at least a portion of any one of the at least two gas channels, and the second target gas channel is at least a portion of any one of the remaining gas channels.

[0050] Since the difference between the first target gas channel and the second target gas channel is an odd multiple of half the wavelength of the noise generated by the fan 20, once the noise passes through the first target gas channel and the second target gas channel and enters the gas chamber 103, that is, the noise finally converges in the gas chamber 103 connected to the air inlet 101, the noise will interfere with each other, thereby reducing the noise.

[0051] In addition, in some embodiments of the present application, multiple gas chambers 103 are spaced apart in sequence within the housing 10; at least two adjacent gas chambers 103 within the multiple gas chambers are connected via at least two gas pipelines 30, and any one of the at least two gas pipelines 30 forms at least a portion of a first target gas channel, while any one of the remaining gas pipelines 30 forms at least a portion of a second target gas channel. This is equivalent to at least two adjacent gas chambers 103 being connected via at least two gas pipelines 30, and the difference in length between at least two of the at least two gas pipelines 30 is an odd multiple of half the wavelength of the noise generated by the fan 20, thereby attenuating the noise as it passes through the gas pipelines 30 and the gas chambers 103.

[0052] Since the length difference between at least two gas pipelines 30 in at least two adjacent gas chambers 103 is an odd multiple of half the wavelength of the noise generated by the fan 20, during the operation of the fan 20, when the noise generated by the fan 20 is transmitted in the gas pipeline 30 between the two adjacent gas chambers 103, the noises in different gas pipelines 30 interfere with each other. That is, once the noises in different gas pipelines 30 are transmitted to the gas chamber 103, they interfere with each other in the gas chamber 103, thereby reducing the noise, and further reducing the noise transmitted to the gas outlet 102.

[0053] It should be noted that, among the multiple gas pipelines 30 between two adjacent gas chambers 103, the length difference between every two adjacent gas pipelines 30 may be an odd multiple of half the wavelength of the noise generated by the fan 20, or the length difference between only two gas pipelines 30 may be an odd multiple of half the wavelength of the noise generated by the fan 20. For example, two adjacent gas chambers 103 have three gas pipelines 30, namely, channel A, channel B, and channel C, and the length difference between channel A and channel B is an odd multiple of half the wavelength of the noise generated by the fan 20. For another example, two adjacent gas chambers 103 have three gas pipelines 30, namely, channel A, channel B, and channel C, and the length difference between channel A and channel B is an odd multiple of half the wavelength of the noise generated by the fan 20, and the length difference between channel B and channel C is an odd multiple of half the wavelength of the noise generated by the fan 20.

[0054] Furthermore, in some embodiments of the present application, the multiple gas chambers 103 can be divided into multiple groups of gas chambers, each group of gas chambers including two adjacent gas chambers 103. The two gas chambers 103 in at least one of the multiple groups of gas chambers are connected via at least two gas pipelines 30, and the two adjacent gas chambers 103 in the remaining groups of gas chambers are connected via at least one gas pipeline 30. Of course, it is also possible for the two adjacent gas chambers 103 in each group of gas chambers to be connected via at least two gas pipelines 30. In any case where two adjacent gas chambers 103 are connected via at least two gas pipelines 30, there will be a gas pipeline 30 in which the length difference between the two gas pipelines 30 is an odd multiple of half the wavelength of the noise.

[0055] In addition, in some embodiments of the present application, multiple gas chambers 103 are sequentially spaced apart in the housing 10. In at least two adjacent gas chambers 103, each gas chamber 103 has multiple inlets 1031 and one outlet 1032. The space between any one of the multiple inlets 1031 and the outlet 1032 forms part of the first target gas channel, and the space between any one of the remaining inlets 1031 and the outlet 1032 forms part of the second gas channel.

[0056] 3 , multiple gas chambers 103 are sequentially spaced apart in the housing 10. Each gas chamber 103 is connected via a gas pipeline 30 and has multiple inlets 1031 and one outlet 1032, or multiple outlets 1032 and one inlet 1031. When the gas chamber 103 has multiple inlets 1031 and one outlet 1032, the distance between one of the at least two inlets 1031 and the outlet 1032 is L1, and the distance between the other inlet 1031 and the outlet 1032 is L2. The difference between L1 and L2 is an odd-integer multiple of half the wavelength of the noise generated by the fan 20, so that the noise is reduced when passing through the gas chamber 103. When the gas chamber 103 has multiple outlets 1032 and one inlet 1031, the distance between one of the at least two outlets 1032 and the inlet 1031 is L3, and the distance between the other outlet 1032 and the inlet 1031 is L4. The difference between L3 and L4 is an odd-integer multiple of half the wavelength of the noise generated by the fan 20, so that the noise is reduced when passing through the gas chamber 103. The inlet 1031 of one gas chamber 103 and the outlet of the other gas chamber 1032 are connected by a gas pipeline 30, thereby achieving communication.

[0057] Among them, when the gas chamber 103 has multiple inlets 1031 and one outlet 1032, at this time, when the two adjacent gas chambers 103 are connected through the gas pipeline 30, the gas pipeline 30 may include a main airway and multiple branch airways, and the multiple branch airways are all connected to the main airway. The main airway is connected to the outlet 1032 of one gas chamber 103 of the two adjacent gas chambers 103, and the multiple branch airways are respectively connected to the multiple inlets 1031 of the other gas chamber 103, thereby realizing the connection between the two adjacent gas chambers 103. When the gas chamber 103 has multiple outlets 1032 and one inlet 1031, when the two adjacent gas chambers 103 are connected through the gas pipeline 30, the gas pipeline 30 may include a main air channel and multiple branch air channels, and the multiple branch air channels are all connected to the main air channel. The main air channel is connected to the inlet 1031 of one gas chamber 103 of the two adjacent gas chambers 103, and the multiple branch air channels are respectively connected to the multiple outlets 1032 of the other gas chamber 103, thereby realizing the communication between the two adjacent gas chambers 103.

[0058] In addition, when the gas chamber 103 has multiple inlets 1031 and one outlet 1032, by setting the difference between L1 and L2 to an odd multiple of half the wavelength of the noise generated by the fan 20, it can be ensured that after the noise of the fan 20 is transmitted to the gas chamber 103, when the noise is transmitted from the outlet 1032 of the cavity chamber to the multiple inlets 1031, the difference in the noise transmission path satisfies an odd multiple of half the wavelength of the noise, so that when the noise is transmitted from the current gas chamber 103 to the gas pipeline 30, and then transmitted to another gas chamber 103 through the gas pipeline 30, the noise interferes with each other in the gas chamber 103, so that the noise is weakened, and then the noise is weakened when it is transmitted to the air inlet 101.

[0059] When the gas chamber 103 has multiple outlets 1032 and one inlet 1031, by setting the difference between L3 and L4 to an odd multiple of half the wavelength of the noise generated by the fan 20, it can be ensured that after the noise of the fan 20 is transmitted to the gas chamber 103, when the noise is transmitted from the multiple outlets 1032 of the gas chamber 103 to the inlet 1031, when the noise is transmitted from the current gas chamber 103 to the gas pipeline 30, and then transmitted to another gas chamber 103 through the gas pipeline 30, the difference in the noise transmission path satisfies the odd multiple of half the wavelength of the noise, so that when the noise is transmitted from the current gas chamber 103 to another gas chamber 103, the noise interferes with each other in the gas chamber 103, so that the noise is weakened, and then the noise is weakened when it is transmitted to the air inlet 101.

[0060] That is, by being arranged in at least two adjacent gas chambers 103, any gas chamber 103 has multiple inlets 1031 and one outlet 1032; the space between any one of the multiple inlets 1031 and the outlet 1032 forms part of the first target gas channel, and the space between any one of the remaining inlets 1031 and the outlet 1032 forms part of the second gas channel. This not only reduces the noise when the gas pipeline 30 between the adjacent gas chambers 103 transmits noise, but also reduces the noise when the gas chamber 103 transmits noise, which can further reduce the noise transmitted to the air inlet 101.

[0061] In addition, in some embodiments of the present application, as shown in FIG2 , a plurality of gas chambers 103 are sequentially adjacent in the housing 10. Among the plurality of gas chambers 103, at least one gas chamber 103 has a plurality of inlets 1031 and an outlet 1032. The space between any one of the plurality of inlets 1031 and the outlet 1032 forms a first target gas channel, and the space between any one of the remaining inlets 1031 and the outlet 1032 forms a second gas channel. Among two adjacent gas chambers 103, the outlet 1032 of one gas chamber 103 coincides with the inlet of the other gas chamber 1031, that is, the outlet 1032 of one gas chamber 103 is the inlet 1031 of the other gas chamber 103. Among some embodiments of the present application, a plurality of gas chambers.

[0062] In which, when the gas chamber 103 has multiple inlets 1031 and one outlet 1032, the distance between one of the at least two inlets 1031 and the outlet 1032 is L1, and the distance between the other inlet 1031 and the outlet 1032 is L2, and the difference between L1 and L2 is an odd multiple of half the wavelength of the noise generated by the fan 20, so that the noise is weakened when passing through the gas chamber 103; when the gas chamber 103 has multiple outlets 1032 and one inlet 1031, the distance between one of the at least two outlets 1032 and the inlet 1031 is L3, and the distance between the other outlet 1032 and the inlet 1031 is L4, and the difference between L3 and L4 is an odd multiple of half the wavelength of the noise generated by the fan 20, so that the noise is weakened when passing through the gas chamber 103.

[0063] In addition, when the gas chamber 103 has multiple inlets 1031 and one outlet 1032, by setting the difference between L1 and L2 to an odd multiple of half the wavelength of the noise generated by the fan 20, it can be ensured that after the noise of the fan 20 is transmitted to the gas chamber 103, when the noise is transmitted from the outlet 1032 of the cavity chamber to the multiple inlets 1031, the difference in the noise transmission path satisfies an odd multiple of half the wavelength of the noise, so that when the noise is transmitted from the current gas chamber 103 to another gas chamber 103, the noise interferes with each other in the gas chamber 103, so that the noise is weakened, and then the noise is weakened when it is transmitted to the air inlet 101.

[0064] When the gas chamber 103 has multiple outlets 1032 and one inlet 1031, by setting the difference between L3 and L4 to an odd multiple of half the wavelength of the noise generated by the fan 20, it can be ensured that after the noise of the fan 20 is transmitted to the gas chamber 103, when the noise is transmitted from the multiple outlets 1032 of the cavity chamber to the inlet 1031, the difference in the noise transmission path satisfies an odd multiple of half the wavelength of the noise, so that when the noise is transmitted from the current gas chamber 103 to another gas chamber 103, the noise interferes with each other in the gas chamber 103, so that the noise is weakened, and then the noise is weakened when it is transmitted to the air inlet 101.

[0065] That is, by setting up multiple gas chambers 103, at least one gas chamber 103 has multiple inlets 1031 and one outlet 1032, the space between any one of the multiple inlets 1031 and the outlet 1032 forms a first target gas channel, and the space between any one of the remaining inlets 1031 and the outlet 1032 forms a second gas channel, which is equivalent to the noise being transmitted to the gas chamber 103. The noise transmission paths are different, so the noises interfere with each other, so that the noise transmitted to the air inlet 101 is weakened.

[0066] It should be noted that, in some embodiments of the present application, a plurality of refers to two or more.

[0067] In addition, in some embodiments of the present application, the multiple gas chambers 103 can be divided into multiple groups of gas chambers, each group of gas chambers includes two adjacent gas chambers 103, and in at least one group of the multiple groups of gas chambers, one gas chamber 103 of the two gas chambers 103 has multiple inlets 1031 and one outlet 1032, and the other gas chamber 103 has one inlet 103 and multiple outlets 1032, and in the two adjacent gas chambers 103 in the remaining groups of gas chambers, each gas chamber 103 has one inlet 1031 and one outlet 1032.

[0068] In addition, in some embodiments of the present application, when the gas chamber 103 has multiple inlets 1031, the number of inlets 1031 can be set according to actual needs. For example, the number of inlets 1031 is 3, and another example is 5. The specific number of inlets 1031 is not limited in some embodiments of the present application. When the gas chamber 103 has multiple outlets 1032, the number of outlets 1032 can be set according to actual needs. For example, the number of outlets 1032 is 3, and another example is 4. The specific number of outlets 1032 is not limited in some embodiments of the present application.

[0069] Furthermore, in some embodiments of the present application, at least two non-adjacent gas chambers 103 among the plurality of gas chambers 103 are connected via at least one gas pipeline 30, with the at least one gas pipeline 30 forming part of the first target gas channel. This arrangement allows the length difference of the gas pipeline 30 between the at least two non-adjacent gas chambers 103 to be an odd multiple of half the wavelength of the noise, further attenuating the gas as it is delivered to the gas inlet 101.

[0070] In addition, in some embodiments of the present application, a sound absorbing member 40 may be provided in the gas channel 30. By providing the sound absorbing member 40 in the gas channel 30, when noise is transmitted in the gas channel 30, a portion of the noise will be absorbed by the sound absorbing member 40, thereby facilitating that the noise transmitted to the air inlet 101 is reduced.

[0071] It should be noted that the sound absorbing member 40 may be sound absorbing cotton, which may be attached to the gas passage 30 and cover the passage wall of the gas passage 30. Of course, the sound absorbing member 40 may also be of other types, for example, the sound absorbing member 40 may be made of silicone. The specific type of the sound absorbing member 40 is not limited in some embodiments of the present application.

[0072] In addition, in some embodiments of the present application, as shown in FIG5 , a sound absorbing member 40 is provided on the wall of at least one gas chamber 103. By providing the sound absorbing member 40 in the gas chamber 103, when noise is transmitted within the gas chamber 103, the noise will be partially absorbed by the sound absorbing member 40, thereby facilitating the reduction of the noise transmitted to the air inlet 101.

[0073] It should be noted that the sound absorbing member 40 may be provided in one gas chamber 103. Of course, the sound absorbing member 40 may also be provided in each gas chamber 103. Of course, the sound absorbing member 40 may also be provided in a portion of the gas chambers 103 among the multiple gas chambers 103. In this regard, some embodiments of the present application are not limited here.

[0074] Of course, in some embodiments of the present application, no sound absorbing member 40 may be provided in the gas chamber.

[0075] In addition, in some embodiments of the present application, as shown in FIG4 , the noise reduction device includes an upper shell 11, a liner 12, a middle shell 13, and a lower shell 14. The upper shell 11, the middle shell 13, and the lower shell 14 are sequentially connected to form a cavity, the liner 12 is located in the cavity, the lower shell 14 and the middle shell 13 enclose a first gas chamber 110, the liner 12 and the upper shell 11 enclose a second gas chamber 120, the liner 12 and the middle shell 13 enclose a third gas chamber 130, the fan 20 is located in the third gas chamber 130, the first gas chamber 110 is connected to the second gas chamber 120, and the second gas chamber 120 is connected to the third gas chamber 130; wherein, the first gas chamber 110 is connected to the second gas chamber 120 through at least one gas channel, and the second gas chamber 110 is connected to the third gas chamber 130 through at least one gas channel; the air inlet 101 is located on the lower shell 14, and the air outlet 102 is located on the middle shell 13.

[0076] Because the air inlet 101 is located on the lower shell 14, the air outlet 102 is located on the middle shell 13, and the fan 20 is located in the third gas chamber 130, when the fan 20 is operating, gas enters the first gas chamber 110 from the air inlet 101, then flows from the first gas chamber 110 into the second gas chamber 120, and finally from the second gas chamber 120 into the third gas chamber 130. The gas then flows into the fan 20 and out of the noise reduction device at the exhaust end of the fan 20, that is, out of the noise reduction device from the air outlet 102. The noise generated by the fan 20 is transmitted from the third gas chamber 130 to the second gas chamber 120, and from the second gas chamber 120 to the first gas chamber 110. During this noise transmission process, the noise is attenuated by the gas chamber 103, thereby reducing the noise transmitted to the air inlet 101.

[0077] It should be noted that two gas channels 30 can be provided between the first gas chamber 110 and the second gas chamber 120, and the difference in length between the two gas channels 30 is an odd multiple of half the wavelength of the noise. Therefore, when the noise is transmitted from the second gas to the first gas chamber 110, that is, the noise converges in the first gas chamber 110, and the noise interferes with each other in the first gas chamber 110, thereby reducing the noise. Of course, three gas channels 30 can also be provided between the first gas chamber 110 and the second gas chamber 120. The number of gas channels 30 between the first gas chamber 110 and the second gas chamber 120 is not limited in some embodiments of the present application.

[0078] In addition, in some embodiments of the present application, when a plurality of gas chambers 103 are provided in the housing 10, two adjacent gas chambers 103 are connected. Alternatively, non-adjacent gas chambers 103 may also be connected.

[0079] In addition, in some embodiments of the present application, as shown in FIG7 , the third gas chamber 130 is connected to the first gas chamber 110 via at least one gas channel. The third gas chamber 130 is not adjacent to the first gas chamber 110, so that the third gas chamber 130 is connected to the first gas chamber 110. Specifically, a gas propagation path, i.e., a gas channel, can be provided between the third gas chamber 130 and the first gas chamber 110, so that noise from the third gas chamber 130 is directly propagated from the third chamber to the first gas chamber 110. In this case, the noise propagated from the third gas chamber 130 and the second gas chamber 120 to the first gas chamber 110 and the noise propagated directly from the third gas chamber 130 to the first gas chamber 110 have different propagation paths and propagation distances, so that the noises that converge in the first gas chamber 110 interfere with each other, thereby reducing the noise.

[0080] It should be noted that there may be at least one gas channel between the third gas chamber 130 and the first gas chamber 110. For example, there may be two gas channels between the third gas chamber 130 and the first gas chamber 110, and the length difference between the two gas channels is an odd multiple of half the wavelength of the noise.

[0081] In some embodiments of the present application, as shown in FIG6 , the second gas chamber 120 may be annular. In this case, the center of the annular shape forms a portion of the third gas chamber 130, where the motor of the blower 20 may be located. Furthermore, the second gas chamber 120 and the third gas chamber 130 are connected via a plurality of openings.

[0082] As shown in Figure 6, three gas channels 30 are provided between the second gas chamber 120 and the third gas chamber 130. Noise propagates from the third gas chamber 130 to the second gas chamber 120. When the noise converges in the second gas chamber 120, the different path lengths cause interference, thereby reducing noise. Furthermore, the high speed and heat generated by the motor of the fan 20 mean that the airflow from the second gas chamber 120 into the third gas chamber 130 is effectively blowing toward the motor from different directions, thus dissipating heat for the motor.

[0083] Since there are multiple gas chambers 103 in the shell 10, at least two gas chambers 103 are connected through the gas channel. Therefore, once the gas enters a gas chamber 103 through the air inlet 101, the gas can be transferred from the gas chamber 103 to other gas chambers 103 through the gas channel until the gas is transferred to the gas chamber 103 connected to the air outlet 102 and finally flows out from the air outlet 102. Since the fan 20 is located in the gas chamber 103 connected to the air outlet 102, and the exhaust end of the fan 20 is connected to the air outlet 102, when the fan 20 is running, the fan 20 can suck the gas into the gas chamber 103 connected to the air inlet 101 through the air inlet 101, and the gas flows in each gas chamber 103, and then the gas enters the gas chamber 103 accommodating the fan 20, and then the gas enters the air inlet end of the fan 20, and the gas flows through the fan 20 and flows out from the exhaust end of the fan 20, that is, the gas flows out from the air outlet 102, and the noise generated by the operation of the fan 20 will be emitted from the fan 20. The gas chamber 103 accommodating the fan 20 is transmitted to the gas chamber 103 connected to the air inlet 101, that is, from the gas chamber 103 accommodating the fan 20 to the air inlet 101. During the noise transmission process, the noise passes through multiple gas chambers 103 through the gas channel, and the path lengths of each gas channel are different, so that when the noise is finally transmitted to the air inlet 101, the noise will interfere with each other, so that the noise transmitted to the air inlet 101 is weakened. In addition, during the noise transmission process, the gas chamber 103 can weaken the noise, and can also make the noise smaller when the noise is transmitted to the gas outlet 1032. That is, in some embodiments of the present application, by setting up multiple gas chambers 103, at least two gas chambers 103 are connected through a gas channel, so that when the fan 20 is running, the noise reduction device can inhale gas without affecting the transmission of the gas, and the noise generated by the fan 20 is transmitted to the gas chamber 103 through the gas channel and finally transmitted to the air inlet 101. The noise interferes with each other, so that the noise transmitted to the air inlet 101 is smaller, and the noise heard by the patient is smaller, which is conducive to improving the patient's sleep and thus improving the patient's usage experience.

[0084] Some embodiments of the present application provide a ventilation therapy device, which includes the noise reduction device in any of the above-mentioned embodiments.

[0085] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0086] Although some embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and purpose of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A noise reduction device, characterized in that, The noise reduction device includes: a housing and a fan; At least two gas chambers are provided in the housing, and the fan is placed in one of the gas chambers; An air inlet and an air outlet are provided on the housing, and at least two gas channels are provided between the air inlet and the air outlet, so that air flows from the air inlet through the gas channels to the air outlet. At least two of the gas chambers are connected through the gas channels, and the path lengths of the gas channels are different.

2. The noise reduction device according to claim 1, wherein, The path length of the gas channel is determined according to the frequency of the noise.

3. The noise reduction device according to claim 2, characterized in that, The difference between the first target gas channel and the second target gas channel is an odd multiple of half the wavelength of the noise generated by the fan, so that the noise is attenuated when flowing through the first target gas channel and the second target gas channel to the air inlet; Wherein, the first target gas channel is at least a part of any one of the at least two gas channels, and the second target gas channel is at least a part of any one of the remaining gas channels.

4. The noise reduction device according to claim 3, wherein, The plurality of gas chambers are sequentially and spaced apart in the housing; At least two adjacent gas chambers among the plurality of gas chambers are connected through at least two gas pipelines, and in the at least two gas pipelines, any one of the gas pipelines forms at least a part of the first target gas channel, and any one of the remaining gas pipelines forms at least a part of the second target gas channel.

5. The noise reduction device according to claim 4, wherein The plurality of gas chambers are sequentially and spaced apart in the housing; In at least two adjacent gas chambers, any one of the gas chambers has a plurality of inlets and one outlet; The space between any one of the plurality of inlets and the outlet forms at least a part of the first target gas channel, and the space between any one of the remaining inlets and the outlet forms at least a part of the second gas channel.

6. The noise reduction device according to claim 3, characterized in that, The plurality of gas chambers are adjacent to each other in the housing; In the plurality of gas chambers, at least one gas chamber has a plurality of inlets and one outlet, and the space between any one of the plurality of inlets and the outlet forms the first target gas channel, and the space between any one of the remaining inlets and the outlet forms the second gas channel.

7. The noise reduction device according to any one of claims 4-6, characterized in that, At least two non-adjacent gas chambers among the plurality of gas chambers are connected through at least one gas pipeline, and at least one gas pipeline forms at least a part of the first target gas channel.

8. The noise reduction device according to claim 4, wherein, A sound-absorbing member is provided in the gas pipeline.

9. The noise reduction device according to claim 1, wherein A sound-absorbing member is provided on the chamber wall of at least one gas chamber.

10. The noise reduction device according to claim 1, wherein, The noise reduction device includes an upper shell, a lining, a middle shell and a lower shell; The upper shell, the middle shell and the lower shell are sequentially connected to form a cavity. The lining is located in the cavity. The lower shell and the middle shell enclose a first gas chamber. The lining and the upper shell enclose a second gas chamber. The lining and the middle shell enclose a third gas chamber. The fan is located in the third gas chamber. The first gas chamber is connected to the second gas chamber, and the second gas chamber is connected to the third gas chamber; Wherein, the first gas chamber and the second gas chamber are communicated through at least one gas passage, and the second gas chamber and the third gas chamber are communicated through at least one gas passage; the air inlet is located on the lower shell, and the air outlet is located on the middle shell.

11. The noise reduction device according to claim 10, wherein The third gas chamber and the first gas chamber are communicated through at least one gas passage.

12. A ventilation treatment device, characterized in that, The ventilation treatment device includes the noise reduction device according to any one of claims 1-11.

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