Silencing device and portable oxygen generator

Abstract

This invention provides a silencing device and a portable oxygen concentrator. The silencing device includes: a chamber forming section having a defined gas inlet position and a defined gas outlet position, enclosing and forming a chamber connecting the gas inlet and outlet. The chamber forming section includes: a partition section dividing the chamber into a confluence region, a first air path, and a second air path, the first and second air paths running parallel, with the first air path having a shorter path than the second air path. A nozzle is defined by the partition section at the downstream end of the second air path. The partition section disperses the airflow entering the chamber into the parallel first and second air paths, ensuring the first air path has a shorter path than the second air path. The nozzle at the downstream end of the second air path allows the airflow from the second air path, after traveling a longer path, to exit from the nozzle and impact the first air path, creating airflow impact and turbulence, thereby effectively dispersing the airflow and consuming its energy, achieving silencing within a limited space.

Description

Technical Field

[0001] This invention relates to the field of oxygen concentrator noise reduction technology, specifically to a noise reduction device and a portable oxygen concentrator including the noise reduction device. Background Technology

[0002] With advancements in medical technology and increased health awareness, oxygen concentrators have become essential auxiliary treatment devices in many homes and medical institutions. Portable oxygen concentrators, in particular, have expanded their application scenarios due to their small size, light weight, and portability.

[0003] However, portable oxygen concentrators generate airflow noise during operation. Due to the limited internal space, it is difficult to install long-distance sound-absorbing pipes or large-volume sound-absorbing cotton in portable oxygen concentrators, making it difficult to effectively suppress airflow noise. This airflow noise can easily affect the user experience, especially when used at night or in quiet environments.

[0004] Therefore, how to effectively consume airflow energy and reduce airflow noise within a limited space has become a pressing technical challenge in the development of portable oxygen concentrators. Summary of the Invention

[0005] To address the above problems, this invention provides a noise reduction device and a portable oxygen generator, which can more effectively increase airflow energy consumption and achieve noise reduction in a limited space.

[0006] The present invention provides a silencing device in a first aspect, comprising: a chamber forming portion having a position defining a gas inlet and a position defining a gas outlet, enclosing and forming a chamber communicating with the gas inlet and the gas outlet. The chamber forming portion includes: a partition portion dividing the chamber into a confluence region near the gas outlet, a first gas path communicating with the gas inlet and located upstream of the confluence region, and a second gas path communicating with the gas inlet and located upstream of the confluence region, the first and second gas paths running parallel, and the first gas path having a shorter path than the second gas path. A nozzle is defined by the partition portion in the downstream portion of the second gas path, the nozzle having a first opening side and a second opening side opposite to each other, the first opening side of the nozzle facing the downstream portion of the second gas path, and the second opening side of the nozzle facing the confluence region near the downstream portion of the first gas path.

[0007] According to the above technical solution, the airflow entering the chamber is dispersed into a first air path and a second air path in parallel by the partition. The first air path is set to have a shorter path than the second air path. By setting a nozzle at the downstream part of the second air path, the airflow of the second air path, after traveling a longer path, can be ejected from the nozzle and impact the first air path, forming airflow impact and turbulence, thereby effectively dispersing the airflow and consuming the airflow energy, and achieving noise reduction in a limited space.

[0008] Optionally, the partition further divides the cavity to form a resonant region, and the cavity forming part further includes: The narrow opening is defined by a partition in the middle section of the second air passage. The narrow opening has a first opening side and a second opening side that are disposed opposite to each other. The first opening side of the narrow opening faces the second air passage, and the second opening side of the narrow opening faces the resonance region. The resonance region is a blind-end chamber that is connected to the second air passage only through the narrow opening.

[0009] According to the above technical solution, by setting a narrow opening to connect a sealed resonance region in the middle of the second air path, when the airflow enters the blind end chamber through the narrow opening, it can induce gas resonance in the blind end chamber, specifically consuming noise energy at a specific frequency, achieving resonance silencing, and further improving the overall silencing effect.

[0010] Optionally, the inlet flow cross-sectional area of ​​the first gas path is smaller than the inlet flow cross-sectional area of ​​the second gas path.

[0011] According to the above technical solution, the gas flow rate entering the two parallel gas paths can be controlled, further enhancing the inconsistency of the flow rates of the two air paths and effectively avoiding the generation of audio resonance.

[0012] Optionally, the second air path includes: a detour region defined by at least two baffles extending inward from opposite side walls of the detour region and offset along the airflow direction, the baffles having fixed ends connected to opposite side walls of the detour region and extended ends extending into the detour region, with a narrow opening positioned at the extended end corresponding to one of the baffles; a slow-flow region located downstream of the detour region, the flow cross-sectional area of ​​the slow-flow region being larger than that of the detour region; and a jetting region located downstream of the slow-flow region, the flow cross-sectional area of ​​the jetting region near the jet nozzle being smaller than that of the slow-flow region. The detour region, the slow-flow region, and the jetting region are at least partially overlapped with each other.

[0013] According to the above technical solution, the airflow entering the slow flow area can effectively buffer the airflow impact and change the gas flow rate, and be guided and accelerated after entering the ejection area; at the same time, through the layered layout of the above areas, the airflow can be reversed and connected in a limited space, effectively extending the airflow path and increasing the airflow energy consumption.

[0014] Optionally, the injection port constitutes the outlet of the second gas path, and the flow cross-sectional area of ​​the area to be ejected near the injection port is smaller than the flow cross-sectional area of ​​the confluence area near the injection port.

[0015] According to the above technical solution, the airflow can be injected from the smaller flow cross-sectional area to the larger flow cross-sectional area of ​​the confluence area through the injection port, thereby having a more effective airflow impact with the airflow in the first air path, increasing the energy consumption of the airflow, and further improving the noise reduction effect.

[0016] Optionally, the partition further divides the chamber to form a diversion area. The diversion area is located upstream of the first and second air passages. The diversion area includes a first diversion area and a second diversion area. The inlet flow cross-sectional area of ​​the first diversion area is smaller than the inlet flow cross-sectional area of ​​the second diversion area. The second diversion area is divided into a first sub-region and a second sub-region in parallel. The first sub-region with a smaller flow cross-sectional area defines the inlet of the first air passage. The connection between the second sub-region with a larger flow cross-sectional area and the first diversion area defines the inlet of the second air passage.

[0017] According to the above technical solution, by using different flow cross-sectional areas and sub-regions to divide the flow, the gas path can be fully dispersed in a limited space, resulting in flow velocity differences in different gas paths, thereby effectively avoiding audio resonance.

[0018] Optionally, the upstream flow path of the first gas path includes a variable-diameter section where the cross-sectional area increases. The flow path of the second sub-region includes a variable-diameter section where the cross-sectional area decreases.

[0019] According to the above technical solution, the airflow entering the first air passage can be expanded and decelerated accordingly, while the airflow entering the second sub-region of the second air passage is contracted and accelerated accordingly, thereby further increasing the change in airflow velocity, more effectively avoiding audio resonance, and improving the noise reduction effect.

[0020] Optionally, the chamber forming portion includes a first sub-part, a second sub-part, and a third sub-part, sequentially arranged in a first direction and detachably connected to each other. At least a portion of the first sub-part, the second sub-part, and the third sub-part is integrally formed. The first sub-part has: a first housing portion, recessed in the first direction away from the second sub-part to form an inner region of the first housing, having a position defining a gas inlet; and an inlet baffle portion, one end of which is connected to a position on the first housing portion near the gas inlet, and the other end extending in the direction away from the gas inlet to separate the inner region of the first housing. A first inlet region is formed on the side of the inlet baffle portion facing the gas inlet, and a second inlet region is formed on the side away from the gas inlet, located downstream of the first inlet region. The downstream of the second inlet region connects to the inlet of the first diversion region and the inlet of the second diversion region. The second sub-part has: an end plate portion, detachably connected to the first housing portion, having the inlet of the first diversion region and the inlet of the second diversion region formed on the end plate portion; and a surrounding plate portion, connected to the outer periphery of the end plate portion and extending in the first direction away from the first sub-part. The first sub-section has a plate portion connected to an end plate portion on one side and an other side portion extending along a first direction, dividing the area within the enclosing plate portion into at least two stacked regions in a third direction, which is perpendicular to the first direction. A second direction is parallel to the gas inlet normal centerline, and the third direction is perpendicular to the second direction. The third sub-section has a third housing portion recessed along the first direction away from the second sub-section to form an inner region within the third housing portion. This inner region forms a connecting and reversing region between at least two stacked regions within the second sub-section. At least a portion of the diversion region, the first gas path, the second gas path, and the confluence region are formed by combining the second and third sub-sections.

[0021] According to the above technical solution, the detachable connection between the first sub-part, the second sub-part, and the third sub-part facilitates the matching and maintenance of the specific silencing structure inside the silencing device; at the same time, by utilizing the combination of the layer plate part, the enclosure plate part, and the area inside the shell, multiple layers of flow channels and connected reversal areas can be formed in a limited space, so that the airflow can smoothly transition between different areas, effectively extending the flow path and increasing energy consumption.

[0022] Optionally, in the first direction, the direction from the second sub-section to the first sub-section is defined as left, and the direction from the second sub-section to the third sub-section is defined as right. In the second direction, the direction closer to the gas inlet is defined as forward, and the direction farther from the gas inlet is defined as rearward. In the third direction, the direction from the second air inlet area to the first air inlet area is defined as upward, and the direction from the first air inlet area to the second air inlet area is defined as downward. In the first sub-section: the air inlet baffle section is connected to the first housing section on the left and to the end plate section on the right, forming a first air inlet area above and a second air inlet area below. The air inlet baffle section includes: a first air inlet baffle section, with its front side connected to the lower part of the gas inlet and its other side extending rearward; a second air inlet baffle section, with its lower side connected to the rear side of the first air inlet baffle section and its other side extending upward; and a third air inlet baffle section, with its front side connected to the upper side of the second air inlet baffle section and its other side extending rearward to be separated from the rear inner wall of the first housing section. The first sub-section also includes: a counter-flush port, which is formed by inserting a protrusion on the end plate portion into a notch on the second air inlet baffle portion. The first opening side of the counter-flush port faces the gas inlet, and the second opening side of the counter-flush port faces the second air inlet region. The normal centerline of the counter-flush port is located above the normal centerline of the gas inlet and at the upper edge of the flow section of the second air inlet region. A first baffle portion is connected to the upper inner wall of the first housing portion on the upper side, connected to the third air inlet baffle portion on the lower side, connected to the left inner wall of the first housing portion on the left side, and separated from the end plate portion on the right side. The first baffle portion and the second baffle portion connected to the end plate portion are spaced apart in the front-rear direction and staggered in the left-right direction to form a detour path in the first air inlet region.

[0023] According to the above technical solution, the baffle can guide the flow path in the first air intake area, effectively extending the flow path in the initial stage of air intake; at the same time, some airflow can directly pass through the counter-flow port and impact the main airflow after passing through the detour flow path, generating turbulence, thereby effectively reducing noise in the initial stage of air intake.

[0024] Optionally, the first sub-section further includes: a first resonant baffle section located below the third inlet baffle section, connected to the left inner wall of the first housing section on the left, connected to the end plate section on the right, connected to the rear inner wall of the first housing section on the rear side, and extending to the rear of the second inlet baffle section on the front side. A second resonant baffle section located behind the second inlet baffle section, connected to the left inner wall of the first housing section on the left, connected to the end plate section on the right, connected to the first resonant baffle section on the upper side, and connected to the lower inner wall of the first housing section on the lower side. The second sub-section includes: a resonant communication port formed inside the position where the end plate section connects to the first and second resonant baffle sections. The inlet of the first diversion region is a plurality of hole structures formed in the end plate section, located below the position where the end plate section connects to the first inlet baffle section, and in front of the position where the end plate section connects to the second resonant baffle section. The inlet of the second diversion region is an opening formed in the end plate section, arranged side by side with the inlet of the first diversion region in the front-rear direction, and located in front of the inlet of the first diversion region.

[0025] Optionally, the second sub-section includes: a first layer plate portion, connected to the end plate portion at its left end, spaced apart from and facing the lower inner surface of the enclosure plate portion; a second layer plate portion, connected to the end plate portion at its left end, with its upper surface spaced apart from the upper inner surface of the enclosure plate portion and its lower surface spaced apart from the first layer plate portion; and a first diversion partition portion, connected to the lower inner surfaces of the first layer plate portion and the enclosure plate portion at its upper and lower sides respectively, with its left side connected to the position between the inlet of the first diversion area and the inlet of the second diversion area on the end plate portion, and extending in the left-right direction to form a second diversion area on the front side and a first diversion area on the rear side. The second diversion baffle section is connected to the front inner wall of the enclosure plate section and the first diversion baffle section on its front and rear sides, respectively. Its lower surface faces the lower inner surface of the enclosure plate section. The left side of the left portion is separated from the inlet of the second diversion area, and the upper surface of the left portion is separated from the first layer plate section to define the inlet of the first gas path. The right portion is lower than the left portion and connects to the third sub-section. The first layer plate section forms a connecting gap corresponding to the right position of the second diversion baffle section, connecting the lower region and the upper region of the first layer plate section. The third resonant baffle section is connected to the lower inner surfaces of the first layer plate section and the enclosure plate section on its upper and lower sides, respectively. Its left side connects to the position between the inlet of the first diversion area and the resonant connecting port on the end plate section and extends in the left-right direction. The fourth resonant baffle section is connected to the lower inner surfaces of the first layer plate section and the enclosure plate section on its upper and lower sides, respectively. Its rear side connects to the rear side wall of the enclosure plate section and extends in the front-rear direction. A first slit extending in the vertical direction is formed between the right portion of the third resonant baffle section and the front portion of the fourth resonant baffle section. The third baffle portion is connected to the fourth resonant baffle portion on the left and extends into the third housing portion on the right. The third baffle portion and the fourth baffle portion connected to the third housing portion are separated in the front-to-back direction and staggered in the left-to-right direction to form a detour path in the detour area. The left end of the fourth baffle portion is positioned opposite the first slit.

[0026] Optionally, the second sub-section includes: a gas outlet plate portion, embedded in an opening on the rear sidewall of the enclosing plate portion, and having multiple gas outlets arranged in a left-right direction; a sound-absorbing baffle portion, connected to the gas outlet plate portion, extending into the confluence area and separating the confluence area, with multiple gas flow holes formed on the sound-absorbing baffle portion; multiple guide blocks, fixed and protruding from the side of the sound-absorbing baffle portion near the gas outlet, with the gas flow holes and guide blocks alternately arranged in the front-rear direction and alternately arranged in the left-right direction; the guide blocks have two opposite ends along the second direction and two opposite sides along the first direction, with the two sides gradually tapering inward from the end away from the gas outlet to the end near the gas outlet along the second direction; and a pair of support plates, respectively located on the left and right sides of the gas outlet plate portion, with the rear side connected to the gas outlet plate portion and the front side extending into the confluence area, the upper and lower sides respectively abutting against the second layer plate portion and the first layer plate portion. The gas outlet plate portion, the sound-absorbing baffle portion, the multiple guide blocks, and the pair of support plates are integrally formed and detachably connected to the second sub-section.

[0027] Optionally, the third baffle portion is located behind the fourth baffle portion, and a conveying channel is formed between the third baffle portion, the rear sidewall of the enclosing plate portion, and the fourth resonant baffle portion. The conveying channel connects the lower region of the first layer plate portion and the upper region of the second layer plate portion. The second sub-part has: a channel forming plate portion, which is connected to the second layer plate portion and the first layer plate portion on its upper and lower sides respectively, enclosing to form the conveying channel; a first ejection baffle portion, which is connected to the second layer plate portion and the first layer plate portion on its upper and lower sides respectively, with one side connected to the channel forming plate portion, and the other side extending forward from the right-side support plate portion to the front of the sound-absorbing baffle portion and then extending to the left; and a second ejection baffle portion, which is connected to the second layer plate portion and the first layer plate portion on its upper and lower sides respectively, and extends in the left and right directions, with its right side flush with the right side of the connecting notch and its left side extending beyond the left side of the connecting notch. In this configuration, a second slit extending in the vertical direction is formed between the left portion of the first ejection baffle and the left portion of the second ejection baffle. The second slit constitutes an ejection port and defines an ejection path in the ejection port that is parallel to the left-right direction. The left end face of the first ejection baffle and the left end face of the second ejection baffle are flush, and the flush planes on which they are located form an angle with the front-back direction.

[0028] Optionally, the third sub-section includes: a first partition plate section that separates a first connecting reversing region of the first air passage within the region of the third housing; a second partition plate section that is connected to the third housing section; the opposite sides of the second partition plate section facing the second connecting reversing region and the third connecting reversing region, respectively; the second connecting reversing region connecting the meandering region below the first partition plate section and the slow-flow region above the second partition plate section; and the third connecting reversing region connecting the slow-flow region above the second partition plate section and the ejection region between the first partition plate section and the second partition plate section. The first layer partition plate portion has: a first partition plate portion, whose front side is connected to the front inner wall of the third housing portion and whose left side is connected to the right side of the second layer plate portion; a second partition plate portion, which is connected to the rear side of the first partition plate portion and extends downward, and whose left side is connected to the right side of the second ejection partition plate portion and the first diversion partition plate portion; a third partition plate portion, which is connected to the lower side of the second partition plate portion and extends forward to connect with the front inner wall of the third housing portion, and whose left side is connected to the right side of the second diversion partition plate portion; the second layer partition plate portion has: a fourth partition plate portion, whose upper side is connected to the upper inner wall of the third housing portion and whose left side is connected to the right side of the channel forming plate portion; a fifth partition plate portion, which is connected to the lower side of the fourth partition plate portion and extends forward to connect with the second partition plate portion, and whose left side is connected to the right side of the first layer plate portion; the upper and lower sides of the fourth baffle portion of the third sub-part are respectively connected to the fifth partition plate portion and the lower inner wall of the third housing portion.

[0029] In a second aspect, the present invention provides a portable oxygen generator, including the aforementioned noise reduction device. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure of the silencing device in its assembled state according to an embodiment of the present invention; Figure 2 This is a structural schematic diagram of the integrally molded part containing the first sub-part, second sub-part, third sub-part and gas outlet plate of the silencing device in an embodiment of the present invention, in a separated state. Figure 3 This is a schematic diagram of the structure of the first sub-part, the second sub-part, and the third sub-part of the silencing device in an embodiment of the present invention, in their separated states. Figure 4 This is a schematic diagram of the structure of the first sub-part in an embodiment of the present invention; Figure 5 This is a structural schematic diagram of one side of the end plate portion of the second sub-part in an embodiment of the present invention; Figure 6 This is a schematic diagram of the upper cross-sectional structure of the silencing device in its assembled state according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the structure of the first sub-part from the right-side view in an embodiment of the present invention; Figure 8This is a schematic diagram showing the positional relationship between the gas inlet and the counter-current outlet in an embodiment of the present invention; Figure 9 This is a schematic diagram of the structure of the second sub-part in an embodiment of the present invention from the right-side view. Figure 10 This is a schematic diagram of the structure of the second sub-part in an embodiment of the present invention; Figure 11 This is a cross-sectional structural diagram of the second sub-part in an embodiment of the present invention; Figure 12 This is a schematic diagram of the front cross-sectional structure of the muffler in its assembled state according to an embodiment of the present invention; Figure 13 This is a schematic diagram of the structure of the third sub-part from the left-hand perspective in an embodiment of the present invention; Figure 14 This is a schematic diagram of the structure of the third component in an embodiment of the present invention; Figure 15 This is a schematic cross-sectional view of the silencing device in an embodiment of the present invention; Figure 16 This is a schematic diagram of the structure of the integrally molded part containing the gas outlet plate in an embodiment of the present invention; Figure 17 This is a schematic diagram of the structure of the integrally molded part containing the gas outlet plate in an embodiment of the present invention, which includes a guide block and a gas outlet side. Figure 18 This is a schematic cross-sectional view of the lower side of the first layer plate and the second diversion baffle plate in the assembled state of the silencing device in an embodiment of the present invention. Figure 19 This is a schematic cross-sectional view of the first and second layer plates in the assembled state of the silencing device according to an embodiment of the present invention. Figure 20 This is a schematic diagram of the planar structure between the first and second layer plates in the assembled state of the silencing device according to an embodiment of the present invention. Figure 21 This is a schematic cross-sectional view of the upper side of the second layer plate in the assembled state of the silencing device in an embodiment of the present invention.

[0031] Reference numerals: Silencing device 100, chamber forming section 101, gas inlet 102, gas outlet 103, confluence area E, first gas path D1, second gas path D2, detour area D22, slow flow area D23, area to be ejected D24, resonance area N, narrow opening 104, injection port 105, diversion area C, first diversion area C1, second diversion area C2, first sub-area C21, second sub-area C22, first sub-section 10, first shell section 11, inlet Air baffle section 12, first air inlet baffle section 121, second air inlet baffle section 122, third air inlet baffle section 123, first air inlet area A, second air inlet area B, counter-flow port 13, notch section 14, first baffle section 15, first resonance baffle section 16, second resonance baffle section 17, second sub-section 20, end plate section 21, inlet C11 of the first diversion area, inlet C23 of the second diversion area, enclosure plate section 22, protrusion 24, second baffle section 25, resonance connection 26. Opening 27. First layer plate 28. Second layer plate 29. First diversion baffle 210. Second diversion baffle 211. Connecting notch 211. Third resonance baffle 212. Fourth resonance baffle 213. Third baffle 214. First slit 215. Gas outlet plate 216. Noise-absorbing baffle 217. Gas flow hole 218. Guide block 219. Support plate 220. First auxiliary guide block 221. Second auxiliary guide block 222. Conveying channel 223. Channel Forming plate portion 224, first ejection baffle portion 225, second ejection baffle portion 226, second slit 227, third sub-portion 30, third housing portion 31, fourth baffle portion 32, first layer partition portion 33, first partition portion 331, second partition portion 332, third partition portion 333, first connecting return region 334, second layer partition portion 34, fourth partition portion 341, fifth partition portion 342, second connecting return region 35, third connecting return region 36. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Figure 1 This is a schematic diagram of the overall structure of the silencing device in its assembled state according to an embodiment of the present invention.

[0034] like Figure 1 As shown, a noise reduction device 100 in this embodiment includes a chamber forming part 101.

[0035] The chamber forming section 101 defines the position of the gas inlet 102 and the position of the gas outlet 103, and encloses and forms a chamber that connects the gas inlet 102 and the gas outlet 103. Specifically, the interior of the chamber forming section 101 defines a chamber space for airflow, the gas inlet 102 is connected to a gas source, and the gas outlet 103 is used to discharge gas.

[0036] refer to Figure 19 and Figure 20 In this embodiment, the chamber forming part 101 includes a partition and a jet port 105.

[0037] The partition divides the chamber into a confluence region E near the gas outlet 103, a first gas path D1 connected to the gas inlet 102 and located upstream of the confluence region E, and a second gas path D2 connected to the gas inlet 102 and located upstream of the confluence region E. The first gas path D1 and the second gas path D2 run parallel to each other, and the distance of the first gas path D1 is shorter than the distance of the second gas path D2.

[0038] Specifically, the partition can be a plate-like structure located inside the chamber, which can divide the internal space of the chamber, thereby creating multiple parallel airflow paths. The airflow entering through the gas inlet 102 will flow into the first air path D1 and the second air path D2 respectively. Since the first air path D1 has a shorter path and the second air path D2 has a longer path, the flow time and flow state of the two parallel airflows differ after flowing through different paths. When the airflows finally converge in the confluence region E, the air paths are fully dispersed and the flow velocities are inconsistent, thereby effectively avoiding the generation of audio resonance.

[0039] The injection port 105 is defined by a partition portion in the downstream portion of the second air passage D2. The injection port 105 has a first opening side and a second opening side disposed opposite to each other. The first opening side of the injection port 105 faces the downstream portion of the second air passage D2, and the second opening side of the injection port 105 faces the position of the confluence region E near the downstream portion of the first air passage D1.

[0040] Specifically, the injection port 105 is located at the end of the second air passage D2, serving as the channel for the second air passage D2 to enter the confluence region E. After passing through the long-distance second air passage D2, the airflow is ejected into the confluence region E through the injection port 105, where it impacts the airflow entering the confluence region E from the first air passage D1. This airflow impact effectively disperses the airflow, creating turbulence, which further consumes airflow energy and achieves a noise reduction effect. All airflows are finally collected in the confluence region E and discharged through the gas outlet 103.

[0041] refer to Figure 18 In this embodiment, the partition further divides the cavity to form a resonant region N, and the cavity forming part 101 also includes a narrow opening 104.

[0042] The narrow opening 104 is defined by a partition in the middle of the second air passage D2. The narrow opening 104 has a first opening side and a second opening side disposed opposite to each other. The first opening side of the narrow opening 104 faces the second air passage D2, and the second opening side of the narrow opening 104 faces the resonance region N. The resonance region N is a blind end chamber that is connected to the second air passage D2 only through the narrow opening 104.

[0043] Specifically, the resonant region N is a blind-end chamber closed at one end, connected to the second air passage D2 only through a narrow opening 104. When the airflow in the second air passage D2 passes through the narrow opening 104, it causes the gas within the resonant region N to resonate. Since the long-distance airflow in the second air passage D2 generates noise at different frequencies during its flow, turbulence, and impact, the resonant region N, as a closed resonant cavity, can utilize gas resonance to specifically eliminate noise at specific frequencies, thereby further improving the overall noise reduction effect of the silencer 100.

[0044] In this embodiment, the inlet flow cross-sectional area of ​​the first gas path D1 is smaller than the inlet flow cross-sectional area of ​​the second gas path D2.

[0045] Specifically, refer to Figure 9 In this embodiment, the inlet flow cross-sectional area of ​​the first gas path D1 is the inlet flow cross-sectional area of ​​the first sub-region C21, and the inlet flow cross-sectional area of ​​the second gas path D2 is the sum of the inlet flow cross-sectional area of ​​the second sub-region C22 and the inlet flow cross-sectional area of ​​the inlet C11 of the first diversion region.

[0046] Since the overall air path of the first air path D1 is relatively short, a smaller inlet flow cross-sectional area can be set accordingly; while the overall air path of the second air path D2 is relatively long, a larger inlet flow cross-sectional area can be set accordingly. This allows control over the gas flow rate entering the two parallel air paths, further enhancing the inconsistency of airflow velocity, effectively avoiding audio resonance and improving the noise reduction effect of airflow impact.

[0047] refer to Figures 18-21 In this embodiment, the second air path D2 includes a detour area D22, a slow flow area D23, and a jetting area D24.

[0048] refer to Figure 18 In the detour area D22, a detour path is defined by at least two baffles that extend inward from the opposite side walls of the detour area D22 and are staggered along the airflow direction. The baffles have fixed ends connected to the opposite side walls of the detour area D22 and extended ends extending into the detour area D22. The slit 104 is located at the extended end of one of the baffles.

[0049] Specifically, after the airflow enters the second air path D2, it first enters the detour area D22. The staggered baffles create a bend in the airflow path, increasing energy consumption. Furthermore, the narrow opening 104 is positioned opposite the extension of one of the baffles, spaced apart from it. This allows the airflow to more easily trigger gas resonance in the adjacent resonance area N as it changes direction through the detour, thus improving the noise reduction effect.

[0050] refer to Figure 21 The slow-flow region D23 is located downstream of the meandering region D22, and the flow cross-sectional area of ​​the slow-flow region D23 is larger than that of the meandering region D22.

[0051] refer to Figure 19 and Figure 20 The ejection area D24 is located downstream of the slow-flow area D23, and the flow cross-sectional area of ​​the ejection area D24 near the nozzle 105 is smaller than the flow cross-sectional area of ​​the slow-flow area D23.

[0052] Specifically, after passing through the detour area D22, the airflow enters the relatively large flow cross-sectional area D23, which effectively buffers the airflow impact and changes the gas velocity. After passing through the flow cross-sectional area D23, it enters the ejection area D24. Since the flow cross-sectional area of ​​the ejection area D24 is correspondingly reduced, the gas can be guided and accelerated before entering the ejection port 105.

[0053] Further, refer to Figures 9-11 The detour region D22, the slow-flow region D23, and the ejection region D24 are arranged in a manner that at least partially overlaps with each other. This overlapping arrangement of the detour region D22, the slow-flow region D23, and the ejection region D24 enables the airflow to be reversibly connected within a limited space, effectively extending the airflow path and increasing airflow energy consumption.

[0054] refer to Figure 20 In this embodiment, the injection port 105 constitutes the outlet of the second gas path D2, and the flow cross-sectional area of ​​the ejection area D24 near the injection port 105 is smaller than the flow cross-sectional area of ​​the confluence area E near the injection port 105.

[0055] Specifically, the injection port 105 serves as the outlet of the second air path D2, connecting the ejection area D24 with the confluence area E. Airflow can be ejected from the smaller ejection area D24 through the injection port 105 into the larger confluence area E, thereby creating a more effective airflow impact with the airflow in the first air path D1, increasing airflow energy consumption, and further enhancing the noise reduction effect.

[0056] refer to Figure 9 and Figure 10In this embodiment, the partition divides the chamber to form a diversion region C. The diversion region C is located upstream of the first air passage D1 and the second air passage D2. The diversion region C includes a first diversion region C1 and a second diversion region C2. (Reference) Figure 5 and Figure 9 The inlet flow cross-sectional area of ​​the first diversion region C1 is smaller than that of the inlet flow cross-sectional area of ​​the second diversion region C2. The second diversion region C2 is divided into two parallel sub-regions: a first sub-region C21 and a second sub-region C22. The first sub-region C21, with its smaller flow cross-sectional area, defines the inlet of the first gas path D1, while the second sub-region C22, with its larger flow cross-sectional area, defines the inlet of the second gas path D2 at the point of connection with the first diversion region C1.

[0057] Specifically, before entering the first air passage D1 and the second air passage D2, the airflow is first distributed in the splitting region C. The airflow is dispersed and guided to the first splitting region C1 and the second splitting region C2, as referenced. Figure 5 and Figure 9 The first diversion region C1 can be composed of a porous structure with a small inlet flow cross-sectional area, which can distribute less gas; the second diversion region C2 is composed of a larger opening structure with a larger inlet flow cross-sectional area, which can distribute more gas.

[0058] refer to Figures 10-11 The airflow entering the second diversion region C2 can be further divided into two layers or two parallel air paths. Part of it enters the first sub-region C21 with a smaller flow cross-sectional area, thus entering the shorter first air path D1. The other part enters the second sub-region C22 with a larger flow cross-sectional area. At the same time, the second sub-region C22 is connected to the first diversion region C1. The airflow in the second sub-region C22 and the first diversion region C1 will converge at the connection point and enter the longer second air path D2 accordingly.

[0059] By using the first diversion region C1 and the second diversion region C2, as well as the first sub-region C21 and the second sub-region C22, to divert the gas flow, the gas path can be fully dispersed within a limited space, resulting in flow velocity differences in different gas paths and effectively avoiding audio resonance.

[0060] In this embodiment, the upstream flow path of the first gas path D1 includes a variable-diameter section where the cross-sectional area of ​​the flow path increases; the flow path of the second sub-region C22 includes a variable-diameter section where the cross-sectional area of ​​the flow path decreases.

[0061] Specifically, refer to Figure 11 and Figure 12In the upstream flow path of the first air path D1, specifically the first sub-region C21, the flow cross-sectional area gradually increases, allowing the incoming airflow to expand and decrease in speed accordingly. Conversely, the flow cross-sectional area of ​​the second sub-region C22, leading to the second air path D2, gradually decreases, causing the incoming airflow to contract and accelerate accordingly. By setting different variable-diameter sections in the branching paths of the first air path D1 and the second sub-region C22, the variation in airflow velocity can be further increased, thereby more effectively avoiding audio resonance and improving the noise reduction effect.

[0062] refer to Figure 2 and Figure 3 In this embodiment, the coordinate system is defined as follows: the x-axis is the first direction, the y-axis is the second direction, and the z-axis is the third direction.

[0063] In this embodiment, the chamber forming part 101 includes a first sub-part 10, a second sub-part 20 and a third sub-part 30 arranged sequentially in a first direction (x-axis) and detachably connected to each other, at least a portion of the first sub-part 10, the second sub-part 20 and the third sub-part 30 being integrally formed parts.

[0064] Specifically, the first sub-part 10, the second sub-part 20, and the third sub-part 30, after being interconnected, can cooperate to form a muffler 100, facilitating the matching and arrangement of the specific muffler structures inside the muffler 100. Simultaneously, the first sub-part 10, the second sub-part 20, and the third sub-part 30 are interconnected in a detachable manner, facilitating the maintenance of the muffler 100. Furthermore, the first sub-part 10, the second sub-part 20, and the third sub-part 30 can each be integrally molded, for example, using engineering plastics, facilitating processing and manufacturing.

[0065] Understandably, the specific structure for the first sub-part 10, the second sub-part 20, and the third sub-part 30 to be detachably connected to each other can be achieved by means of interference fit connection, snap-fit ​​connection, screw connection, etc. As long as the detachable connection between the first sub-part 10, the second sub-part 20, and the third sub-part 30 can be achieved, the specific form of the detachable connection is not specifically limited here.

[0066] refer to Figure 4 and Figure 6 The first sub-part 10 has a first housing part 11 and an air inlet baffle part 12.

[0067] The first housing portion 11 is recessed along the first direction (x-axis) away from the second sub-portion 20 to form an inner region of the first housing, which has a position that defines the gas inlet 102.

[0068] One end of the air inlet baffle portion 12 is connected to the first housing portion 11 near the gas inlet 102, and the other end extends away from the gas inlet 102 to separate the area inside the first housing. A first air inlet area A is formed on the side of the air inlet baffle portion 12 facing the gas inlet 102, and a second air inlet area B is formed on the side away from the gas inlet 102, which is downstream of the first air inlet area A. The downstream of the second air inlet area B is connected to the inlet C11 of the first diversion area and the inlet C23 of the second diversion area.

[0069] Specifically, an initial air intake space is formed in the first housing region within the first housing portion 11, and the airflow first enters the first housing region through the gas inlet 102. The air intake baffle portion 12 can serve as a flow guiding structure, dividing the first housing region into a first air intake region A and a second air intake region B that are connected sequentially. After the airflow enters the first air intake region A, it is blocked by the air intake baffle portion 12 and changes its flow direction, turning back into the second air intake region B, where it converges and is guided to the inlet C11 of the downstream first diversion region and the inlet C23 of the second diversion region.

[0070] In this embodiment, in the first direction (x-axis), the direction from the second sub-part 20 toward the first sub-part 10 is defined as left, and the direction from the second sub-part 20 toward the third sub-part 30 is defined as right; in the second direction (y-axis), the direction closer to the gas inlet 102 is defined as forward, and the direction farther from the gas inlet 102 is defined as backward; in the third direction (z-axis), the direction from the second air inlet region B to the first air inlet region A is defined as upward, and the direction from the first air inlet region A to the second air inlet region B is defined as downward.

[0071] refer to Figure 4 and Figure 7 In the first sub-part 10: the air inlet baffle part 12 is connected to the first housing part 11 on the left and to the end plate part 21 on the right, forming a first air inlet area A above and a second air inlet area B below.

[0072] The air intake baffle section 12 includes a first air intake baffle section 121, a second air intake baffle section 122, and a third air intake baffle section 123.

[0073] The front side of the first air inlet baffle 121 is connected to the area below the gas inlet 102, and the other side extends rearward.

[0074] The lower side of the second air intake baffle 122 is connected to the rear side of the first air intake baffle 121, and the other side extends upward.

[0075] The front side of the third air inlet baffle 123 is connected to the upper side of the second air inlet baffle 122, and the other side extends rearward to be separated from the rear inner wall of the first housing 11.

[0076] Specifically, the first air inlet baffle 121, the second air inlet baffle 122, and the third air inlet baffle 123 are connected sequentially to form a stepped, bent air inlet baffle 12. This air inlet baffle 12 connects the first housing portion 11 and the end plate portion 21 in the left-right direction, thereby dividing the area inside the first housing into an upper first air inlet region A and a lower second air inlet region B. The first air inlet baffle 121 and the third air inlet baffle 123 extend parallel to the front-back direction, while the second air inlet baffle 122 is perpendicular to the front-back direction, with its two surfaces facing the gas inlet 102 and the second air inlet region B, respectively.

[0077] After entering through the gas inlet 102, the airflow first enters the first air intake region A. Blocked by the air intake baffle 12, the airflow cannot penetrate directly downwards. Instead, it flows along the upper surface of the air intake baffle 12 until it reaches the gap between the third air intake baffle 123 and the rear inner wall of the first housing 11, before flowing downwards into the second air intake region B. The air intake baffle 12 effectively extends the airflow path during the initial intake phase.

[0078] Furthermore, the first sub-part 10 also includes a punching port 13 and a first baffle part 15.

[0079] refer to Figure 4 and Figure 5 The punch 13 is formed by inserting a protrusion 24 on the end plate portion 21 into a notch 14 on the second air intake baffle portion 122. (See reference) Figure 7 The first opening side of the punch 13 faces the gas inlet 102, and the second opening side of the punch 13 faces the second gas inlet region B. The normal center line L1 of the punch 13 is located above the normal center line L2 of the gas inlet 102, and the normal center line L1 of the punch 13 is located at the upper edge of the flow section of the second gas inlet region B.

[0080] refer to Figures 4-6 The upper side of the first baffle portion 15 is connected to the upper inner wall of the first housing portion 11, the lower side is connected to the third air inlet baffle portion 123, the left side is connected to the left inner wall of the first housing portion 11, and the right side is separated from the end plate portion 21. The first baffle portion 15 and the second baffle portion 25 connected to the end plate portion 21 are separated in the front-back direction and staggered in the left-right direction to form a meandering path in the first air inlet area A.

[0081] Specifically, refer to Figure 4 and Figure 6The first baffle portion 15 is correspondingly disposed within the first air inlet region A, forming a structural layout with the second baffle portion 25 connected to the end plate portion 21, which is spaced apart front to back and staggered left to right. During the flow of air within the first air inlet region A, the airflow is alternately blocked and guided by the staggered first baffle portion 15 and the second baffle portion 25, causing the airflow to form a meandering flow path within the first air inlet region A, further extending the airflow path and increasing the energy consumption of the airflow. The number of first baffle portions 15 can be two or more, and the number of second baffle portions 25 can be one or more, with the second baffle portions 25 correspondingly positioned between adjacent first baffle portions 15, forming a multi-stage baffle structure.

[0082] At the same time, refer to Figure 4 The punch 13 is formed by the engagement of the protrusion 24 on the end plate portion 21 and the notch 14 on the second air inlet baffle portion 122. The remaining space of the notch 14, which is not filled by the protrusion 24, is correspondingly defined to form the punch 13. Through the above structural engagement, the forming difficulty of the punch 13 can be reduced, and it is easy to achieve the centered setting of the punch 13, and the opening size of the punch 13 can be correspondingly limited.

[0083] Some of the airflow entering from the gas inlet 102 can directly pass through the counter-flow port 13 and enter the second air intake area B. It will then collide with the main airflow that flows into the second air intake area B after passing through the detour flow path, generating turbulence. This can effectively consume the airflow energy, thereby effectively reducing noise in the initial stage of air intake and improving the overall noise reduction effect of the silencer 100.

[0084] In addition, refer to Figure 7 The distance between the normal centerline L1 of the counter-flush 13 and the first air inlet baffle 121 in the z-axis direction is D1, and the distance between the normal centerline L2 of the gas inlet 102 and the first air inlet baffle 121 in the z-axis direction is D2. By making D1 > D2, the air intake path can be lengthened, improving the noise reduction effect. At the same time, the counter-flush 13 is located close to the edge of the upper first air passage A, so that the airflow passing through the counter-flush 13 can adhere to the lower surface of the air inlet baffle 12 in the second air intake area B, reducing aerodynamic noise caused by airflow turbulence and improving the noise reduction effect.

[0085] Further, refer to Figure 8In this embodiment, the remaining space of the notch 14 not filled by the protrusion 24 on the end plate 21 is correspondingly defined to form a counter-flow port 13. With the projection direction parallel to the normal centerline of the gas inlet 102, the orthographic projection of the gas inlet 102 at least partially overlaps with the orthographic projection of the counter-flow port 13, and the orthographic projection of the second air inlet region B at least partially overlaps with the orthographic projection of the counter-flow port 13. Furthermore, the projection line connecting the midpoint of the counter-flow port 13, the midpoint of the gas inlet 102, and the midpoint of the second air inlet region B in the same plane in the left-right direction is parallel to the up-down direction. This allows the airflow entering through the gas inlet 102 to be aligned with the counter-flow port 13 and enter the second air inlet region B, improving the airflow counter-flow effect, increasing airflow energy consumption, and reducing additional noise generated by airflow deflection and impact, thus improving the noise reduction effect.

[0086] Furthermore, in this embodiment, the opening area of ​​the counter-current port 13 is smaller than the opening area of ​​the gas inlet 102, and the opening area of ​​the gas inlet 102 is smaller than the flow cross-sectional area of ​​the second air inlet region B. The smaller opening area of ​​the counter-current port 13 causes the airflow to be throttled and accelerated when passing through the counter-current port 13, forming a high-speed jet; while the airflow after counter-current port 13 expands in volume when entering the second air inlet region B with a larger flow cross-sectional area, and the flow velocity decreases accordingly, further enhancing the noise reduction effect.

[0087] Furthermore, in this embodiment, a protruding strip is provided on the side where the air inlet baffle portion 12 connects to the end plate portion 21, and the protruding strip avoids the position of the notch portion 14. A groove matching the protruding strip is also provided in the end plate portion 21, and the protruding strip can be correspondingly placed in the groove. When the first sub-part 10 and the second sub-part 20 are connected, the protruding strip is embedded in the groove, which can correspondingly block the gap between the air inlet baffle portion 12 and the end plate portion 21, preventing the airflow in the first air inlet area A from directly leaking into the second air inlet area B through the gap between the air inlet baffle portion 12 and the end plate portion 21, thereby ensuring a noise reduction effect.

[0088] refer to Figure 4 and Figure 7 In this embodiment, the first sub-part 10 further includes a first resonant partition part 16 and a second resonant partition part 17.

[0089] The first resonant baffle portion 16 is located below the third air inlet baffle portion 123, connected to the left inner wall of the first housing portion 11 on the left side, connected to the end plate portion 21 on the right side, connected to the rear inner wall of the first housing portion 11 on the rear side, and extended to the rear of the second air inlet baffle portion 122 on the front side.

[0090] The second resonant baffle portion 17 is located behind the second air inlet baffle portion 122. It is connected to the left inner wall of the first housing portion 11 on the left side, to the end plate portion 21 on the right side, to the first resonant baffle portion 16 on the upper side, and to the lower inner wall of the first housing portion 11 on the lower side.

[0091] Specifically, the first resonant baffle portion 16 and the second resonant baffle portion 17 are disposed in the space below and behind the air inlet baffle portion 12 in the region inside the first housing. The first resonant baffle portion 16 and the second resonant baffle portion 17 are connected to each other and are respectively connected to the left inner wall, the rear inner wall, the lower inner wall and the end plate portion 21 of the first housing portion 11, thereby forming a partial chamber within the first housing, which provides a spatial basis for constructing a blind-end chamber with one end closed.

[0092] Furthermore, in this embodiment, the first resonant baffle portion 16 and the third inlet baffle portion 123 are spaced apart and arranged parallel to each other, and the first resonant baffle portion 16 and the second resonant baffle portion 17 are correspondingly bent and connected. After the airflow returning from the first inlet region A enters the second inlet region B, it is guided by the first resonant baffle portion 16 and firstly flows between the third inlet baffle portion 123 and the first resonant baffle portion 16. After passing the bend, the flow direction changes further. At the same time, the bend is located downstream of the counterflow port 13, so that the airflow facing the counterflow port 13 in the second inlet region B flows horizontally. Therefore, after the airflow from the counterflow port 13 enters the second inlet region B, it can more effectively counterflow with the horizontally flowing airflow.

[0093] Furthermore, in this embodiment, a protruding strip is provided on the side where the first resonant partition portion 16 and the second resonant partition portion 17 are connected to the end plate portion 21. A groove matching the protruding strip is also provided in the end plate portion 21, and the protruding strip can be correspondingly placed in the groove. When the first sub-part 10 and the second sub-part 20 are connected, the protruding strip is embedded in the groove, which can block the gap between the first resonant partition portion 16 and the second resonant partition portion 17 and the end plate portion 21, and prevent air leakage between the second air inlet area B and the resonant area N, so as to ensure the resonance noise reduction effect.

[0094] refer to Figure 5 The second sub-part 20 has an end plate part 21, a surrounding plate part 22, and a layer plate part.

[0095] The end plate portion 21 is detachably connected to the first housing portion 11, and the end plate portion 21 has an inlet C11 for the first diversion area and an inlet C23 for the second diversion area.

[0096] The outer periphery of the enclosure plate portion 22 is connected to the outer periphery of the end plate portion 21 and extends away from the first sub-portion 10 along the first direction (x-axis).

[0097] One side of the layer plate is connected to the end plate 21, and the other side extends along the first direction (x-axis), dividing the area within the enclosure plate 22 into at least two stacked areas in a third direction (z-axis), the third direction (z-axis) being perpendicular to the first direction (x-axis); the second direction (y-axis) is parallel to the gas inlet normal centerline, and the third direction (z-axis) is perpendicular to the second direction (y-axis).

[0098] Specifically, the end plate portion 21 serves as a connecting component between the second sub-part 20 and the first sub-part 10, and the assembly between the first sub-part 10 and the second sub-part 20 is achieved through a detachable connection with the first housing portion 11. An inlet C11 for the first diversion region and an inlet C23 for the second diversion region are provided on the end plate portion 21, enabling the guidance and diversion of airflow in the second air intake region B.

[0099] The enclosing plate portion 22 encloses and forms the internal space of the second sub-part 20. The layer plate portion is correspondingly disposed within the internal space enclosed by the enclosing plate portion 22, dividing the internal space into at least two overlapping regions in the vertical third direction (z-axis). This allows the layer plate portion to form a multi-layer flow channel within the limited space of the second sub-part 20, thereby effectively extending the airflow path and increasing the airflow energy consumption.

[0100] Further, refer to Figure 5 The second sub-section 20 includes a resonant connection port 26, an inlet C11 of the first diversion region, and an inlet C23 of the second diversion region.

[0101] refer to Figure 5 and Figure 7 The resonant connection port 26 is formed inside the position where the end plate portion 21 connects with the first resonant partition portion 16 and the second resonant partition portion 17.

[0102] The inlet C11 of the first diversion region is a plurality of hole structures formed on the end plate portion 21, located below the connection position between the end plate portion 21 and the first air inlet baffle portion 121, and in front of the connection position between the end plate portion 21 and the second resonant baffle portion 17.

[0103] The inlet C23 of the second diversion area is an opening formed in the end plate portion 21, which is arranged side by side with the inlet C11 of the first diversion area in the front-back direction and is located in front of the inlet C11 of the first diversion area.

[0104] Specifically, the resonant connection port 26 is located at the position of the local cavity formed by the first resonant partition portion 16 and the second resonant partition portion 17, so that the local cavity can be connected and communicated with the space inside the second sub-part 20 through the resonant connection port 26, thereby forming a complete blind-end cavity with one end closed.

[0105] At the same time, refer to Figure 5 and Figure 9 The airflow exiting from the second inlet region B is guided and dispersed as it passes through the end plate 21. The inlet C11 of the first diversion region employs a perforated structure composed of multiple small holes, while the inlet C23 of the second diversion region uses a relatively large opening. A small amount of gas enters through the small holes of the inlet C11 of the first diversion region, while a large amount of gas flows into the opening of the inlet C23 of the second diversion region. By using different inlet structures in the first diversion region C1 and the second diversion region C2, preliminary diversion can be achieved, creating velocity differences in the airflow along different diversion paths, thereby preventing audio resonance.

[0106] refer to Figures 9-12 In this embodiment, the second sub-part 20 includes a first layer plate part 27, a second layer plate part 28, a first diversion baffle part 29, a second diversion baffle part 210, a third resonance baffle part 212, a fourth resonance baffle part 213, and a third baffle part 214.

[0107] The left end of the first layer plate 27 is connected to the end plate 21, and is separated from and face-to-face with the lower inner surface of the enclosure plate 22; the left end of the second layer plate 28 is connected to the end plate 21, and its upper surface is separated from the upper inner surface of the enclosure plate 22, and its lower surface is separated from the first layer plate 27.

[0108] Specifically, the first plate section 27 and the second plate section 28 are transverse plates arranged in the xoy plane. The first plate section 27 and the second plate section 28 divide the internal space of the second sub-section 20 into mutually isolated three-dimensional stacked regions in the third direction (z-axis), providing a layered flow channel for airflow.

[0109] refer to Figures 9-11 In this embodiment, three stacked regions are formed within the second sub-section 20 by the first layer plate portion 27 and the second layer plate portion 28, respectively, including a detour region D22, a jetting region D24, and a slow-flow region D23. It is understood that in other embodiments, two stacked regions or other numbers of stacked regions may also be used, as long as the flow path of the airflow can be effectively increased by setting multiple stacked regions within a limited space.

[0110] refer to Figures 9-10 The upper and lower sides of the first diversion partition 29 are respectively connected to the lower inner surfaces of the first layer plate 27 and the enclosure plate 22. The left side is connected to the position between the inlet C11 of the first diversion area and the inlet C23 of the second diversion area on the end plate 21, and extends in the left and right directions to form the second diversion area C2 on the front side and the first diversion area C1 on the rear side.

[0111] Specifically, the first diversion baffle 29 is a longitudinal plate disposed in the xoz plane, which divides the first diversion region C1 and the second diversion region C2 into front and back, so that the two airflows entering from the end plate 21 can maintain a separate state in an orderly manner and flow independently.

[0112] refer to Figures 9-12 The front and rear sides of the second diversion baffle 210 are respectively connected to the front inner wall of the enclosure plate 22 and the first diversion baffle 29. The lower surface faces the lower inner surface of the enclosure plate 22. The left side of the left part is separated from the inlet C23 of the second diversion area. The upper surface of the left part is separated from the first layer plate 27 to define the inlet of the first gas passage D1. The right part is lower than the left part and is connected to the third sub-part 30. The first layer plate 27 forms a connecting gap 211 corresponding to the right position of the second diversion baffle 210. The connecting gap 211 connects the lower area of ​​the first layer plate 27 and the upper area of ​​the first layer plate 27.

[0113] Specifically, the second diversion baffle 210 further guides and diverts the airflow within the second diversion region C2. Its upper left surface is separated from the first layer plate 27, correspondingly defining the first sub-region C21 and the inlet of the first air passage D1, allowing some airflow to be distributed into the relatively shorter first air passage D1. Simultaneously, the lower surface of the second diversion baffle 210 faces the lower inner surface of the enclosing plate 22 and is spaced apart, correspondingly defining the second sub-region C22.

[0114] Furthermore, by opening a connecting gap 211 on the first layer plate 27 at the position corresponding to the right side of the second diversion baffle 210, the lower region of the first layer plate 27 and the upper region of the first layer plate 27 can be connected to form a first air passage D1, so that after the airflow flows into the first sub-region C21, it can flow to the confluence region E through the connecting gap 211.

[0115] refer to Figure 18 The upper and lower sides of the third resonant partition 212 are respectively connected to the lower inner surfaces of the first layer plate 27 and the enclosure plate 22, and the left side is connected to the position between the inlet C11 of the first diversion area on the end plate 21 and the resonant communication port 26, and extends in the left and right directions.

[0116] The upper and lower sides of the fourth resonant partition 213 are respectively connected to the lower inner surfaces of the first layer plate 27 and the enclosure plate 22, and the rear side is connected to the rear side wall of the enclosure plate 22 and extends in the front-back direction. A first slit 215 extending in the vertical direction is formed between the right part of the third resonant partition 212 and the front part of the fourth resonant partition 213.

[0117] Specifically, the third resonant partition 212, the fourth resonant partition 213 and the rear side wall of the enclosure plate 22 form a local cavity, and on the left side, it is connected to the local cavity formed by the first resonant partition 16 and the second resonant partition 17 through the resonant communication port 26, thereby forming a resonant region N with a first slit 215 only at one end.

[0118] refer to Figure 18 The left side of the third baffle portion 214 is connected to the fourth resonant baffle portion 213, and the right side extends into the third housing portion 31. The third baffle portion 214 and the fourth baffle portion 32 connected to the third housing portion 31 are spaced apart in the front-back direction and staggered in the left-right direction to form a detour path in the detour area D22. The left end of the fourth baffle portion 32 is positioned opposite the first slit 215.

[0119] Specifically, the third baffle portion 214 and the fourth baffle portion 32 provided in the third housing portion 31 cooperate with each other. Through the arrangement of being separated front and back and staggered left and right, the airflow can flow in the detour area D22 in a detour path, which effectively extends the airflow path and increases the airflow energy consumption.

[0120] In addition, refer to Figure 18 The left end of the fourth baffle 32 is positioned directly opposite the first slit 215, making it easier for the airflow to trigger the resonance region N on the side through the first slit 215 during the process of entering the detour region D22, thereby generating gas resonance and specifically consuming noise energy of a specific frequency and improving the noise reduction effect.

[0121] refer to Figures 18-21 In this embodiment, the third baffle portion 214 is located behind the fourth baffle portion 32, and a conveying channel 223 is formed between the third baffle portion 214, the rear side wall of the enclosure plate portion 22, and the fourth resonant partition portion 213. The conveying channel 223 connects the lower region of the first layer plate portion 27 and the upper region of the second layer plate portion 28.

[0122] Specifically, the conveying channel 223 can be used as a cross-layer connection channel, so that the airflow in the lower region of the first layer plate 27 can smoothly cross upward and enter the upper region of the second layer plate 28, for example, from the detour region D22 to the slow flow region D23, thereby realizing the flow of air between different height stacked regions and effectively extending the airflow path in a limited space.

[0123] refer to Figure 19 and Figure 20 The second sub-part 20 has a channel forming plate part 224, a first ejection baffle part 225, and a second ejection baffle part 226.

[0124] refer to Figure 10The upper and lower sides of the channel forming plate 224 are respectively connected to the second layer plate 28 and the first layer plate 27, forming a conveying channel 223.

[0125] Specifically, the channel forming plate 224 is disposed in the space between the first layer plate 27 and the second layer plate 28, and together they form a relatively closed vertical conveying channel 223, so that the airflow does not leak during the upward conveying process across layers.

[0126] refer to Figure 19 and Figure 20 The upper and lower sides of the first ejection baffle 225 are respectively connected to the second layer plate 28 and the first layer plate 27. One side is connected to the channel forming plate 224, and the other side first extends forward close to the right support plate 220 to the front of the sound-absorbing baffle 217 and then extends to the left. The upper and lower sides of the second ejection baffle 226 are respectively connected to the second layer plate 28 and the first layer plate 27 and extend in the left and right directions. The right side is flush with the right side of the connecting gap 211, and the left side extends beyond the left side of the connecting gap 211.

[0127] Specifically, the first ejection baffle section 225, the second ejection baffle section 226, the first layer plate section 27, and the second layer plate section 28 cooperate to form the ejection area D24. The airflow that enters the slow flow area D23 from the conveying channel 223 in the detour area D22 will be guided by the first ejection baffle section 225 and the second ejection baffle section 226 into the ejection area D24.

[0128] refer to Figure 20 A second slit 227 extending in the vertical direction is formed between the left portion of the first ejection baffle portion 225 and the left portion of the second ejection baffle portion 226. The second slit 227 constitutes the injection port 105 and defines the injection path in the injection port 105 parallel to the left-right direction. The left end face of the first ejection baffle portion 225 and the left end face of the second ejection baffle portion 226 are flush, and the flush plane of the two forms an angle with the front-back direction.

[0129] Specifically, the second slit 227 provided between the first ejection baffle portion 225 and the second ejection baffle portion 226 constitutes an ejection port 105 for airflow distribution. The airflow can be ejected through the ejection port 105 and impact the airflow in the first air passage D1 to increase the energy consumption of the airflow.

[0130] Furthermore, the left end faces of the first ejection baffle portion 225 and the second ejection baffle portion 226 are flush, and the flush surface has a certain angle with the front and rear direction, so that the high-speed jet passing through the second slit 227 has a deflection angle, which makes the ejected airflow more powerfully impact the airflow, improves the consumption of airflow energy, and thus improves the noise reduction effect.

[0131] refer to Figures 15-17 In this embodiment, the second sub-part 20 includes a gas outlet plate 216, a sound-absorbing baffle 217, a guide block 219, and a support plate 220.

[0132] refer to Figure 2 and Figure 16 The gas outlet plate portion 216 is embedded in the opening on the rear side wall of the enclosure plate portion 22, and forms a plurality of gas outlets 103 arranged in the left-right direction.

[0133] The sound-absorbing baffle 217 is connected to the gas outlet plate 216, extends into the confluence area E and separates the confluence area E, and a plurality of gas flow holes 218 are formed on the sound-absorbing baffle 217.

[0134] refer to Figure 17 Multiple guide blocks 219 are fixed and protrude from the side of the silencing baffle 217 near the gas outlet 103. In the front-back direction, the gas flow hole 218 and the guide block 219 are alternately arranged. In the left-right direction, the gas flow hole 218 and the guide block 219 are alternately arranged. The guide block 219 has two opposite ends along the second direction (y-axis) and two opposite sides along the first direction (x-axis). The two sides gradually taper inward from one end away from the gas outlet 103 to the other end near the gas outlet 103 along the second direction (y-axis).

[0135] refer to Figure 16 and Figure 17 A pair of support plates 220 are placed on the left and right sides of the gas outlet plate 216, with the rear side connected to the gas outlet plate 216 and the front side extending into the confluence area E. The upper and lower sides respectively abut against the second layer plate 28 and the first layer plate 27.

[0136] The gas outlet plate 216, the sound-absorbing baffle 217, the multiple guide blocks 219 and the pair of support plates 220 are integrally formed and detachably connected to the second sub-section 20.

[0137] Specifically, in the confluence area E where the gas is about to be discharged from the silencer 100, an integrally molded part is provided, which is composed of a gas outlet plate 216, a silencer baffle 217, a guide block 219 and a support plate 220.

[0138] refer to Figure 15The integrally molded part is supported by a pair of support plates 220 abutting between the first plate 27 and the second plate 28. At the same time, the sound-absorbing baffle 217 further separates the confluence area E into upper and lower parts. The airflow entering the confluence area E is divided into two parts. One part flows directly in the lower layer, and the other part enters the upper layer and then enters the lower layer through the gas flow hole 218. The two parts of airflow converge in the lower layer and form an airflow impact turbulence, which effectively consumes the airflow energy.

[0139] Furthermore, in this embodiment, the guide blocks 219 and gas flow holes 218 are arranged in a two-dimensional array on the sound-absorbing baffle portion 217. In the same left-right direction, the guide blocks 219 and gas flow holes 218 are arranged alternately; adjacent rows in the front-back direction are staggered, such that the guide blocks 219 in adjacent rows are phase-shifted in the left-right direction, and the gas flow holes 218 in adjacent rows are also phase-shifted in the left-right direction. This staggered arrangement constitutes a multi-level blocking structure, preventing the formation of a straight air path in the front-back direction, i.e., the airflow discharge direction.

[0140] As the airflow moves towards the gas outlet 103, it is continuously blocked and guided by the guide block 219, which effectively extends the flow path within the limited space. Simultaneously, the downward airflow entering from the gas flow hole 218 collides with the airflow flowing in the front and back directions, repeatedly generating impact, mixing, and turbulence, effectively increasing airflow energy loss. Furthermore, the alternating arrangement of the guide block 219 and the gas flow hole 218 guides the airflow to diffuse evenly in the left and right directions, allowing the airflow to be discharged smoothly and gently from multiple gas outlets 103, effectively suppressing aerodynamic noise generated by localized high-speed airflow impacts.

[0141] Furthermore, in this embodiment, the end of the guide block 219 furthest from the gas outlet 103 along the front-rear direction is formed as an arc surface. When the airflow passes through the guide block 219, the arc surface at the front end can smoothly split the airflow and guide it to both sides of the guide block 219. While effectively blocking and guiding the airflow, it also suppresses the noise generated by the airflow directly impacting the guide block 219. After the incoming airflow is dispersed, it flows along the gradually inward-curving side surfaces of the guide block 219 to the tail end near the gas outlet 103, further suppressing the aerodynamic noise generated by airflow separation and reducing exhaust resistance while consuming sound energy.

[0142] Furthermore, in this embodiment, the gas outlet 103 is disposed through the gas outlet plate portion 216 in the front-to-back direction, and the gas outlet 103 has two ports in the front-to-back direction. The diameter of the port closer to the confluence region E is smaller than the diameter of the port farther from the confluence region E. Thus, the gas outlet 103 forms an airflow channel with a gradually increasing diameter along the airflow discharge direction. When the airflow flows through the gas outlet 103 and is discharged, the gradual increase in the flow cross-section causes the airflow volume to expand and the flow velocity to decrease, thereby effectively reducing the jet noise when the gas is discharged from the gas outlet 103.

[0143] Furthermore, in this embodiment, a pair of support plates 220 have an arc-shaped surface on the front side away from the gas outlet plate 216, facing the sound-absorbing baffle plate 217. This arc-shaped surface design can guide the airflow smoothly into the area where the sound-absorbing baffle plate 217 is located, reducing the noise generated by the airflow impacting the end face of the support plate 220.

[0144] Meanwhile, the enclosing plate 22 of the second sub-part 20 has a stepped surface near the gas outlet 103 to form an outwardly flared opening. The height of the gas outlet plate 216 is greater than the height of the support plate 220 and matches the outline of the outwardly flared opening. During assembly, the support plate 220 is inserted into the second sub-part 20 by elastic deformation under pressure, and the gas outlet plate 216 is stopped and positioned by contacting the stepped surface. This not only avoids over-insertion during assembly but also allows for easy assembly and disassembly of the integrally molded part, facilitating subsequent cleaning and maintenance.

[0145] Understandably, the integral molded part consisting of the gas outlet plate 216, the sound-absorbing baffle 217, the multiple guide blocks 219 and the pair of support plates 220 can be detachably connected to the second sub-part 20 by means of interference fit, snap fit, screw fit, etc. The structure of detachable connection is not specifically limited, as long as it can achieve detachable connection between the integral molded part and the second sub-part 20.

[0146] Further, refer to Figure 17 In this embodiment, a first auxiliary guide block 221 is provided on one side of a pair of support plate portions 220 facing the guide block 219. The first auxiliary guide block 221 protrudes from the support plate portion 220 and has a wavy profile in the front-back direction. The first auxiliary guide block 221 is positioned between the support plate portion 220 and the side guide block 219, which can block and guide the airflow flowing along the edge, avoiding the formation of a straight leakage air path on the side. Multiple first auxiliary guide blocks 221 can be provided and arranged at intervals in the front-back direction, with their crests facing the adjacent guide block 219 and the gas flow hole 218. Through the above arrangement, the gas flow hole 218 in the edge area can also be blocked from multiple directions, further guiding the airflow to change direction and improving the noise reduction effect.

[0147] Further, refer to Figure 17 In this embodiment, a plurality of second auxiliary guide blocks 222 are provided on one side of the gas outlet plate portion 216 facing the guide block 219, and the second auxiliary guide blocks 222 and the gas outlet 103 are arranged alternately in the left-right direction.

[0148] For the last row of gas flow holes 218 and guide blocks 219 adjacent to the second auxiliary guide block 222 in the front-back direction, they are arranged in a staggered configuration with the second auxiliary guide block 222 facing the gas flow hole 218 and the gas outlet 103 facing the guide block 219. The end of the second auxiliary guide block 222 facing the gas flow hole 218 is set as an arc surface, so that the gas passing downward from the last row of gas flow holes 218 can be smoothly guided by the arc surface of the second auxiliary guide block 222 and diverted to the adjacent gas outlet 103 for discharge; at the same time, the guide block 219 in front of the gas outlet 103 can converge the surrounding airflow into the gas outlet 103 for discharge. This structure effectively avoids the airflow directly and forcefully impacting the wall between the gas outlets 103, suppressing the impact noise at the exhaust end.

[0149] refer to Figure 13 and Figure 14 The third sub-part 30 has a third housing part 31.

[0150] The third housing portion 31 is recessed along the first direction (x-axis) away from the second sub-portion 20 to form an inner region of the third housing. The inner region of the third housing forms a connecting and reversing region between at least two stacked regions within the second sub-portion 20. At least part of the diversion region C, the first gas passage D1, the second gas passage D2, and the confluence region E are formed by combining the second sub-portion 20 and the third sub-portion 30.

[0151] Specifically, refer to Figure 12 and Figure 21 The internal region of the third shell section 31, formed within the third shell section 31, enables the interconnection of the separated upper and lower stacked regions in the second sub-section 20, facilitating the reversal flow of airflow between different layered spaces. Simultaneously, the combination of the second sub-section 20 and the third sub-section 30 completely encloses parts of the diversion region C, the first air passage D1, the second air passage D2, and the confluence region E, allowing for smooth reversal and transition of airflow between different layers, further extending the airflow path within the confined space, and increasing energy consumption.

[0152] refer to Figure 13 and Figure 14 In this embodiment, the third sub-part 30 has a first layer spacer plate part 33 and a second layer spacer plate part 34.

[0153] The first layer partition plate 33 separates the first connecting return region 334 of the first air passage D1 within the region of the third housing.

[0154] The first partition plate portion 33 has a first partition plate portion 331, a second partition plate portion 332, and a third partition plate portion 333.

[0155] The front side of the first partition section 331 is connected to the front inner wall of the third housing section 31, and the left side is connected to the right side of the second layer plate section 28. The second partition section 332 is connected to the rear side of the first partition section 331 and extends downward, with the left side connected to the right side of the second ejection partition section 226 and the first diversion partition section 29. The third partition section 333 is connected to the lower side of the second partition section 332 and extends forward to connect with the front inner wall of the third housing section 31, with the left side connected to the right side of the second diversion partition section 210.

[0156] Specifically, refer to Figure 11 , Figure 14 and Figure 12 The first partition section 331, the second partition section 332, and the third partition section 333 are sequentially connected and cooperate with the second layer plate section 28, the second ejection partition section 226, the first diversion partition section 29, and the second diversion partition section 210, forming a first connecting return region 334 connected to the first sub-region C21 within the third housing region. After the airflow in the first air passage D1 flows through the first sub-region C21 and reaches the first connecting return region 334, it will turn back towards the confluence region E, effectively extending the airflow path in the first air passage D1, increasing airflow energy consumption, and preventing air passage cross-flow or leakage.

[0157] refer to Figure 13 and Figure 14 The second-layer partition plate portion 34 is connected to the third housing portion 31, and the opposite sides of the second-layer partition plate portion 34 face the second connecting foldback region 35 and the third connecting foldback region 36, respectively. (Reference) Figure 19 and Figure 21 The second connecting reversal region 35 connects the detour region D22 below the first layer plate 27 and the slow flow region D23 above the second layer plate 28. The third connecting reversal region 36 connects the slow flow region D23 above the second layer plate 28 and the ejection region D24 between the first layer plate 27 and the second layer plate 28.

[0158] Specifically, through the second connecting reversal area 35 and the conveying channel 223, the airflow in the detour area D22 can be guided to flow upward into the slow flow area D23, and then buffered and decelerated in the larger slow flow area D23; at the same time, the third connecting reversal area 36 enables the airflow to turn downward again after being buffered by the slow flow area D23 and enter the ejection area D24, realizing the airflow flow in the corresponding different stacked areas and effectively extending the airflow path within the effective space.

[0159] refer to Figure 13 and Figure 14 The second partition plate portion 34 has a fourth partition plate portion 341 and a fifth partition plate portion 342.

[0160] The upper side of the fourth partition plate 341 is connected to the upper inner wall of the third housing 31, and the left side is connected to the right side of the channel forming plate 224.

[0161] The fifth partition section 342 is connected to the lower side of the fourth partition section 341 and extends forward to connect with the second partition section 332, and its left side is connected to the right side of the first layer plate section 27. The upper and lower sides of the fourth baffle section 32 of the third sub-section 30 are respectively connected to the lower inner wall of the fifth partition section 342 and the lower side of the third housing section 31.

[0162] Specifically, the fourth partition section 341 and the fifth partition section 342 are interconnected and cooperate with the third housing section 31, the second partition section 332, the channel forming plate section 224 and the first layer plate section 27 to form an airflow boundary, which can provide reliable structural support for the cross-layer flow of airflow and effectively prevent airflow cross-flow or leakage.

[0163] Furthermore, in this embodiment, the fourth partition plate 341 is higher than the second layer plate 28 in the vertical direction, so as to further ensure that the airflow in the detour area can flow through the second connecting reversal area 35 and the conveying channel 223 to the slow flow area D23, and then flow to the ejection area D24 accordingly, effectively avoiding airflow cross-contamination.

[0164] Furthermore, since the fourth baffle portion 32 is connected between the fifth partition portion 342 and the lower inner wall of the third housing portion 31, the fourth baffle portion 32 can cooperate with the third baffle portion 214 at the bottom of the second sub-part 20 in spatial position, ensuring that the airflow in the detour area D22 can make sufficient detours before flowing upwards into the second connecting reversal area 35, further ensuring the consumption of airflow energy.

[0165] The specific flow process of gas in the silencer 100 in this embodiment will be described below.

[0166] The airflow enters the first air inlet region A within the first housing through the gas inlet 102. Guided by the air inlet baffle 12, the first baffle 15, and the second baffle 25, it forms a meandering flow and then flows downward into the second air inlet region B. At the same time, part of the airflow directly passes through the counterflow port 13 and enters the second air inlet region B, where it counterflows with the airflow that has completed the meandering flow and entered the second air inlet region B.

[0167] Subsequently, the airflow in the second intake region B flows to the end plate 21. Part of the airflow enters the first diversion region C1 through the inlet C11, and another part enters the second diversion region C2 through the inlet C23. The airflow entering the second diversion region C2 is further divided. Part of the airflow enters the first sub-region C21 and thus enters the first air passage D1; the other part of the airflow enters the second sub-region C22 and merges with the airflow flowing out of the first diversion region C1 at the connection point, and together enters the second air passage D2.

[0168] The airflow entering the first air passage D1 continues to flow to the third sub-section 30, turns back through the first connecting reversal area 334 defined by the first layer partition plate 33, and flows to the confluence area E.

[0169] The airflow entering the second air passage D2 first enters the detour region D22 below the first layer plate 27, and correspondingly passes through the first slit 215 connecting the resonance region N. The airflow flows along the detour path with the cooperation of the third baffle 214 and the fourth baffle 32. Subsequently, the airflow in the detour region D22 flows upward through the delivery channel 223 and the second connecting reversal region 35, rising into the slow-flow region D23 above the second layer plate 28. After passing through the slow-flow region D23, the airflow turns downward again through the third connecting reversal region 36, entering the ejection region D24 located between the first layer plate 27 and the second layer plate 28. In the ejection region D24, the airflow is guided by the first ejection baffle 225 and the second ejection baffle 226, and finally ejected into the confluence region E through the ejection port 105 formed by the second slit 227.

[0170] Finally, the airflow ejected from the nozzle 105 of the second air passage D2 impacts the airflow from the first air passage D1 before reaching the confluence region E. The mixed airflow passes through the silencing baffle 217 within the confluence region E, where it is split vertically. Part of the airflow directly enters the lower side of the silencing baffle 217, while the other part enters the lower side of the silencing baffle 217 through multiple gas flow holes 218. The airflow on the lower side of the silencing baffle 217 passes through the guide block 219 and is finally discharged through multiple gas outlets 103 on the gas outlet plate 216.

[0171] In this embodiment, a portable oxygen generator is also provided, including the silencer 100 described in this embodiment. Specifically, the oxygen generation component is used to separate oxygen from the air, and may include a compressor, a molecular sieve adsorption tower, and a gas path valve assembly. The oxygen generation component may be provided with an exhaust port, through which pressurized exhaust gas (e.g., nitrogen gas discharged during pressure swing adsorption) is periodically discharged during the oxygen generation process.

[0172] The gas inlet 102 of the silencer 100 can be connected to the exhaust outlet of the oxygen generator assembly. After the gas enters the silencer 100 through the gas inlet 102, it undergoes processing through internal detours, diversions, reversals, and resonances, effectively consuming airflow energy within a limited space, thereby achieving noise reduction and improving the overall quietness of the portable oxygen generator during operation.

[0173] It is understood that there are no particular restrictions on the installation location of the silencer 100 in the portable oxygen concentrator. The silencer 100 can be installed in one or more locations on the portable oxygen concentrator according to the silencer requirements.

[0174] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A noise reduction device, comprising: A chamber forming section has a defined position for a gas inlet and a defined position for a gas outlet, which enclose and form a chamber that connects the gas inlet and the gas outlet; The chamber forming portion is characterized by comprising: The partition divides the chamber into a confluence area near the gas outlet, a first gas path connected to the gas inlet and located upstream of the confluence area, and a second gas path connected to the gas inlet and located upstream of the confluence area. The first gas path and the second gas path run in parallel, and the distance of the first gas path is shorter than the distance of the second gas path. The injection port is defined by the dividing portion at the downstream portion of the second air passage. The injection port has a first opening side and a second opening side disposed opposite to each other. The first opening side of the injection port faces the downstream portion of the second air passage, and the second opening side of the injection port faces the confluence region near the downstream portion of the first air passage.

2. The silencing device as described in claim 1, characterized in that, The partition also divides the cavity to form a resonant region. The chamber forming section further includes: The slit is defined by the partition in the middle of the second air passage. The slit has a first opening side and a second opening side disposed opposite to each other. The first opening side of the slit faces the second air passage, and the second opening side of the slit faces the resonance region. The resonance region is a blind-end chamber that communicates with the second air passage only through the slit.

3. The silencing device as described in claim 2, characterized in that, The inlet flow cross-sectional area of ​​the first gas path is smaller than that of the inlet flow cross-sectional area of ​​the second gas path.

4. The silencing device as described in claim 3, characterized in that, The second air passage includes: A meandering area is defined by at least two baffles that extend inward from opposite side walls of the meandering area and are staggered along the airflow direction to form a meandering path. The baffles have fixed ends connected to opposite side walls of the meandering area and extended ends extending into the meandering area. The slit is located at the position corresponding to the extended end of one of the baffles. A slow-flow region is located downstream of the meandering region, and the flow cross-sectional area of ​​the slow-flow region is larger than that of the meandering region. The area to be ejected is located downstream of the slow-flow area, and the cross-sectional area of ​​the area to be ejected near the nozzle is smaller than the cross-sectional area of ​​the slow-flow area. The meandering area, the slow-flowing area, and the area to be ejected are arranged to overlap each other at least partially.

5. The silencing device as described in claim 4, characterized in that, The injection port constitutes the outlet of the second air passage. The cross-sectional area of ​​the region to be ejected near the nozzle is smaller than the cross-sectional area of ​​the confluence region near the nozzle.

6. The silencing device as described in claim 5, characterized in that, The partition further divides the chamber to form a diversion area, which is located upstream of the first air path and the second air path. The diversion area includes a first diversion area and a second diversion area, wherein the inlet flow cross-sectional area of ​​the first diversion area is smaller than the inlet flow cross-sectional area of ​​the second diversion area. The second diversion region is divided into a first sub-region and a second sub-region in parallel. The first sub-region with a smaller flow cross-sectional area defines the inlet of the first gas path, and the second sub-region with a larger flow cross-sectional area defines the inlet of the second gas path at the connection between the second sub-region and the first diversion region.

7. The silencing device as described in claim 6, characterized in that, The upstream flow path of the first gas path includes a variable-diameter section where the cross-sectional area of ​​the flow path increases from small to large. The circulation path of the second sub-region includes variable-path sections where the cross-sectional area of ​​the circulation path decreases.

8. The silencing device as described in claim 7, characterized in that, The chamber forming portion includes a first sub-part, a second sub-part, and a third sub-part, which are sequentially arranged in a first direction and detachably connected to each other. At least a portion of the first sub-part, the second sub-part, and the third sub-part is an integrally molded part. The first sub-part has: A first housing portion is recessed along the first direction in a direction away from the second sub-port to form an inner region of the first housing portion, which has a position defining the gas inlet; An air inlet baffle portion has one end connected to a position on the first housing portion near the gas inlet, and the other end extending away from the gas inlet to separate the area inside the first housing. A first air inlet area is formed on the side of the air inlet baffle portion facing the gas inlet, and a second air inlet area is formed on the side away from the gas inlet, located downstream of the first air inlet area. The downstream of the second air inlet area is connected to the inlet of the first diversion area and the inlet of the second diversion area. The second sub-part has: The end plate portion is detachably connected to the first housing portion, and the end plate portion has an inlet for the first diversion area and an inlet for the second diversion area; The enclosing plate portion is connected to the outer periphery of the end plate portion and extends in the first direction away from the first sub-portion; The layered plate portion has one side connected to the end plate portion and the other side extending along the first direction, dividing the area within the enclosing plate portion into at least two stacked regions in a third direction, the third direction being perpendicular to the first direction; the second direction is parallel to the gas inlet normal centerline, and the third direction is perpendicular to the second direction; The third sub-part has: The third housing portion is recessed along the first direction in a direction away from the second sub-portion to form an inner region of the third housing portion. The inner region of the third housing portion forms a connecting foldback region between the at least two stacked regions within the second sub-portion. The diversion area, the first gas path, the second gas path, and the confluence area are at least partially formed by the combination of the second sub-section and the third sub-section.

9. The silencing device as described in claim 8, characterized in that, In the first direction, the direction from the second sub-part to the first sub-part is defined as left, and the direction from the second sub-part to the third sub-part is defined as right; In the second direction, the direction closer to the gas inlet is considered forward, and the direction farther from the gas inlet is considered backward; In the third direction, the direction from the second air inlet area to the first air inlet area is considered upward, and the direction from the first air inlet area to the second air inlet area is considered downward; In the first sub-part: The air inlet baffle is connected to the first housing portion on the left and to the end plate portion on the right, forming a first air inlet area above and a second air inlet area below. The air inlet baffle includes: The first air inlet baffle section is connected to the lower part of the gas inlet on the front side and extends rearward on the other side; The second air intake baffle is connected to the rear side of the first air intake baffle on the lower side and extends upward on the other side; The third air inlet baffle is connected to the upper side of the second air inlet baffle on the front side, and extends rearward on the other side to be separated from the rear inner wall of the first housing part. The first sub-part also includes: The counter-flush port is formed by inserting a protrusion on the end plate portion into a notch on the second air inlet baffle portion. The first opening side of the counter-flush port faces the gas inlet, and the second opening side of the counter-flush port faces the second air inlet region. The normal center line of the counter-flush port is located above the normal center line of the gas inlet and at the upper edge of the flow section of the second air inlet region. The first baffle portion is connected to the upper inner wall of the first housing portion on the upper side, connected to the third air inlet baffle portion on the lower side, connected to the left inner wall of the first housing portion on the left side, and separated from the end plate portion on the right side. The first baffle portion and the second baffle portion connected to the end plate portion are separated in the front-back direction and staggered in the left-right direction to form a detour path in the first air inlet area.

10. The silencing device as described in claim 9, characterized in that, The first sub-part also includes: The first resonant baffle portion is located below the third air inlet baffle portion, with its left side connected to the left inner wall of the first housing portion, its right side connected to the end plate portion, its rear side connected to the rear inner wall of the first housing portion, and its front side extending to the rear of the second air inlet baffle portion. The second resonant baffle section is located behind the second air inlet baffle section. Its left side is connected to the left inner wall of the first housing section, its right side is connected to the end plate section, its upper side is connected to the first resonant baffle section, and its lower side is connected to the lower inner wall of the first housing section. The second sub-part includes: A resonant connection port is formed inside the position where the end plate portion connects with the first resonant partition portion and the second resonant partition portion; The inlet of the first diversion area is a plurality of hole structures formed on the end plate portion, located below the connection position between the end plate portion and the first air inlet baffle portion, and in front of the connection position between the end plate portion and the second resonant baffle portion; The entrance to the second diversion area is an opening formed in the end plate portion, which is arranged side by side with the entrance to the first diversion area in the front-back direction and is located in front of the entrance to the first diversion area.

11. The silencing device as described in claim 10, characterized in that, The second sub-part includes: The first layer plate portion is connected to the end plate portion at its left end, and is separated from the lower inner surface of the enclosing plate portion and is arranged face to face. The second layer plate is connected to the end plate at its left end, and its upper surface is separated from the upper inner surface of the enclosing plate and its lower surface is separated from the first layer plate. The first diversion partition is connected to the lower inner surfaces of the first layer plate and the enclosure plate respectively on its upper and lower sides. The left side is connected to the position between the inlet of the first diversion area and the inlet of the second diversion area on the end plate and extends in the left and right directions to form the second diversion area on the front side and the first diversion area on the rear side. The second diversion baffle section is connected to the front inner wall of the enclosure plate section and the first diversion baffle section on its front and rear sides, respectively. Its lower surface faces the lower inner surface of the enclosure plate section. The left side of the left section is separated from the inlet of the second diversion area, and the upper surface of the left section is separated from the first layer plate section to define the inlet of the first gas path. The right section is lower than the left section and is connected to the third sub-section. The first layer plate section forms a connecting gap corresponding to the right position of the second diversion baffle section. The connecting gap connects the lower area of ​​the first layer plate section and the upper area of ​​the first layer plate section. The third resonant partition section is connected to the lower inner surfaces of the first layer plate section and the enclosure plate section on the upper and lower sides, respectively. The left side is connected to the position between the inlet of the first diversion area and the resonant communication port on the end plate section, and extends in the left and right directions. The fourth resonant partition portion is connected to the lower inner surfaces of the first layer plate portion and the enclosure plate portion on its upper and lower sides, respectively, and is connected to the rear sidewall of the enclosure plate portion on its rear side, and extends in the front-rear direction. A first slit extending in the vertical direction is formed between the right part of the third resonant partition portion and the front part of the fourth resonant partition portion. The third baffle portion is connected to the fourth resonant baffle portion on the left and extends into the third housing portion on the right. The third baffle portion and the fourth baffle portion connected to the third housing portion are spaced apart in the front-back direction and staggered in the left-right direction to form a detour path in the detour area. The left end of the fourth baffle portion is positioned opposite the first slit.

12. The silencing device as described in claim 11, characterized in that, The second sub-part has: The gas outlet plate is embedded in the opening on the rear side wall of the enclosure plate and forms a plurality of gas outlets arranged in the left-right direction; A sound-absorbing baffle section is connected to the gas outlet plate section, extends into the confluence area and separates the confluence area, and a plurality of gas flow holes are formed on the sound-absorbing baffle section; Multiple guide blocks are fixed and protrude from the side of the sound-absorbing baffle near the gas outlet. In the front-to-back direction, the gas flow hole and the guide blocks are alternately arranged. In the left-to-right direction, the gas flow hole and the guide blocks are alternately arranged. The guide block has two opposite ends along the second direction and two opposite sides along the first direction. The two sides gradually taper inward from one end away from the gas outlet to the other end near the gas outlet along the second direction. A pair of support plates are placed on the left and right sides of the gas outlet plate, with the rear side connected to the gas outlet plate and the front side extending into the confluence area. The upper and lower sides respectively abut against the second layer plate and the first layer plate. The gas outlet plate, the sound-absorbing plate, the plurality of guide blocks and the pair of support plates are integrally formed and detachably connected to the second sub-section.

13. The silencing device as described in claim 12, characterized in that, The third baffle is located behind the fourth baffle, and a conveying channel is formed between the third baffle, the rear sidewall of the enclosing plate, and the fourth resonant partition. The conveying channel connects the lower region of the first layer plate and the upper region of the second layer plate. The second sub-part has: The channel forms a plate portion, with its upper and lower sides respectively connected to the second layer plate portion and the first layer plate portion, enclosing and forming the conveying channel; The first ejection baffle section is connected to the second layer plate section and the first layer plate section on the upper and lower sides respectively. One side is connected to the channel forming plate section, and the other side first extends forward to the front of the sound-absorbing baffle section, close to the right side of the support plate section, and then extends to the left. The second ejection partition is connected to the second layer plate and the first layer plate respectively on the upper and lower sides, and extends in the left and right directions. The right side is flush with the right side of the connecting gap, and the left side extends beyond the left side of the connecting gap. Wherein, a second slit extending in the vertical direction is formed between the left portion of the first ejection baffle portion and the left portion of the second ejection baffle portion. The second slit constitutes the ejection port and defines the ejection path in the ejection port that is parallel to the left-right direction. The left end face of the first ejection baffle portion and the left end face of the second ejection baffle portion are flush, and the flush plane of the two forms an angle with the front-back direction.

14. The silencing device as described in claim 13, characterized in that, The third sub-part has: The first layer of the partition plate separates the first connecting and reversing region of the first air passage within the region of the third housing. The second layer partition plate is connected to the third housing portion. The two opposite sides of the second layer partition plate face the second connecting reversal area and the third connecting reversal area, respectively. The second connecting reversal area connects the meandering area below the first layer plate and the slow flow area above the second layer plate. The third connecting reversal area connects the slow flow area above the second layer plate and the ejection area between the first layer plate and the second layer plate. The first layer of the partition plate has: The first partition section is connected to the front inner wall of the third housing section on its front side, and to the right side of the second layer plate section on its left side. The second baffle section is connected to the rear side of the first baffle section and extends downwards, and its left side is connected to the right side of the second ejection baffle section and the first diversion baffle section. The third partition section is connected to the lower side of the second partition section and extends forward to connect with the front inner wall of the third housing section, and its left side is connected to the right side of the second diversion partition section. The second layer of the partition plate has: The fourth partition section is connected to the upper inner wall of the third housing section on its upper side and to the right side of the channel forming plate section on its left side. The fifth partition section is connected to the lower side of the fourth partition section and extends forward to connect with the second partition section, and its left side is connected to the right side of the first layer section. The upper and lower sides of the fourth baffle of the third sub-part are respectively connected to the lower inner wall of the fifth partition and the third housing.

15. A portable oxygen concentrator, characterized in that, The silencing device includes any one of claims 1 to 14.

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