One-way valve, silencer and oxygen generator

Abstract

The embodiment of the application provides a one-way valve, a silencer and an oxygen generator, the one-way valve comprising a shell, a gravity valve rod assembly and a silencing filter element; the shell is provided with an air inlet; the gravity valve rod assembly is movably connected in the shell and is used for opening or closing the air inlet; the silencing filter element is arranged between the gravity valve rod assembly and the shell, the inner wall of the silencing filter element and at least part of the shell form a first air cavity, the first air cavity is communicated with the air inlet; at least part of the shell is provided with a plurality of first exhaust holes at positions corresponding to the outer wall of the silencing filter element, so that the gas medium entering the first air cavity from the air inlet flows through the silencing filter element and the first exhaust holes in sequence and is then discharged. In this way, when the high-pressure gas medium enters the first air cavity from the air inlet, it will flow through the silencing filter element and the first exhaust holes in sequence, and under the action of the resistive noise reduction of the silencing filter element and the small hole noise reduction of the first exhaust hole, the noise formed by the gas medium is reduced.

Description

Technical Field

[0001] This application belongs to the field of medical device technology, specifically relating to a one-way valve, a silencer, and an oxygen generator. Background Technology

[0002] Molecular sieve oxygen generators use molecular sieves as adsorbents and employ pressure swing adsorption (PSA) technology to physically separate nitrogen and oxygen from air at room temperature and low pressure, thereby extracting high-purity medical oxygen and releasing nitrogen. However, the nitrogen emission channel is bidirectional, allowing humid, high-pressure gas to convect onto the molecular sieve, accelerating its aging. Furthermore, the nitrogen emission process generates significant noise, causing noise pollution.

[0003] In existing technologies, a one-way valve is typically installed in the nitrogen emission channel to prevent humid, high-pressure gas from convection into the molecular sieve. However, since existing one-way valves only guide the high-pressure gas in one direction, oxygen generators need to be equipped with additional noise reduction components to reduce the noise of nitrogen emissions, which increases the manufacturing cost of the oxygen generator. Summary of the Invention

[0004] This application aims to provide a one-way valve, a silencer, and an oxygen generator to solve the problems that existing one-way valves cannot reduce noise and that oxygen generators require additional noise reduction components, resulting in higher manufacturing costs.

[0005] To solve the above-mentioned technical problems, this application is implemented as follows:

[0006] In a first aspect, this application discloses a one-way valve, which includes a housing, a gravity valve stem assembly, and a silencer filter element;

[0007] The housing is provided with an air inlet;

[0008] The gravity valve stem assembly is movably connected to the housing, and the gravity valve stem assembly is used to open or close the air inlet;

[0009] The silencer filter element is disposed between the gravity valve stem assembly and the housing. The inner wall of the silencer filter element and at least a portion of the housing enclose a first air chamber, which is connected to the air inlet. At least a portion of the housing is provided with a plurality of first exhaust holes at positions corresponding to the outer wall of the silencer filter element, so that the gas medium entering the first air chamber from the air inlet flows sequentially through the silencer filter element and the first exhaust holes before being discharged.

[0010] Optionally, the extension direction of the housing is a first direction, and along the first direction, the housing has a first end and a second end that are disposed opposite to each other, and the air inlet is disposed at the second end;

[0011] The first end is provided with a first top wall, and a guide limiting structure is provided on the side of the first top wall near the air inlet. Along the first direction, the gravity valve stem assembly is slidably connected to the guide limiting structure to open or close the air inlet.

[0012] Optionally, the guide limiting structure includes a guide cylinder, one end of which is fixed to the first top wall;

[0013] The inner wall of the guide cylinder is provided with a guide limiting block extending along the first direction, and the gravity valve rod assembly is slidably connected to the guide limiting block along the first direction to open or close the air inlet.

[0014] Alternatively, the inner wall of the guide cylinder is provided with a guide limiting groove extending along the first direction, and the gravity valve stem assembly is slidably connected to the guide limiting groove along the first direction to open or close the air inlet.

[0015] Optionally, the first top wall is provided with a reset hole, which communicates with the guide cylinder.

[0016] Optionally, the housing further includes sidewalls that extend from around the periphery of the first top wall toward the air inlet;

[0017] A first protrusion is provided on the inner side of the sidewall, and the first protrusion is used to support the sound-absorbing filter element.

[0018] Optionally, along the first direction, the sidewall includes a first sidewall and a second sidewall arranged sequentially, the second sidewall being away from the first top wall;

[0019] The first vent is disposed on the first side wall, and the first boss is disposed on the second side wall.

[0020] Optionally, along the first direction, the second sidewall has a third end and a fourth end disposed opposite to each other, the fourth end being opposite to the first sidewall;

[0021] Along the direction from the third end to the fourth end, at least a portion of the dimensions of the second sidewall decrease sequentially.

[0022] Optionally, the noise-absorbing filter element includes a second top wall perpendicular to the first direction, and a third side wall extending from the periphery of the second top wall toward the air inlet direction;

[0023] The second top wall has a mounting hole, and the guide limiting structure passes through the mounting hole;

[0024] The end of the third sidewall that is away from the second top wall abuts against the first boss.

[0025] Optionally, the gravity valve stem assembly includes a valve stem and a sealing ring;

[0026] Along the first direction, the valve stem has a fifth end and a sixth end that are disposed opposite to each other, the sixth end being close to the air inlet;

[0027] The fifth end is provided with a guide limiting groove extending along the first direction. Along the first direction, the guide limiting groove is slidably connected to the guide limiting structure to open or close the air inlet.

[0028] The sixth end is provided with a groove, and the sealing ring is embedded in the groove. When the sealing ring abuts against the second side wall, the air inlet is closed, and when the sealing ring is released from contact with the second side wall, the air inlet is opened.

[0029] Optionally, the gravity valve stem assembly includes a valve stem and a sealing ring;

[0030] Along the first direction, the valve stem has a fifth end and a sixth end that are disposed opposite to each other, the sixth end being close to the air inlet;

[0031] The fifth end is provided with a guide limiting groove extending along the first direction. Along the first direction, the guide limiting groove is slidably connected to the guide limiting structure to open or close the air inlet; the sixth end has an abutment surface.

[0032] The second sidewall is provided with a second protrusion, and the sealing ring is fixed to the second protrusion. When the abutting surface abuts against the sealing ring, the air inlet is closed, and when the abutting surface is released from contact with the sealing ring, the air inlet is opened.

[0033] Optionally, the extending direction of the housing is a first direction, and the housing includes an upper housing and a lower housing disposed along the first direction;

[0034] The upper housing and the lower housing are detachably connected.

[0035] Optionally, the noise-absorbing filter element is a porous sintered filter element.

[0036] Secondly, this application also discloses a muffler, the muffler comprising:

[0037] The intake and exhaust end caps are positioned opposite each other;

[0038] A cylindrical body is disposed between the air inlet end cap and the air outlet end cap, and the cylindrical body, the air inlet end cap, and the air outlet end cap together form a cavity;

[0039] And the one-way valve described in any of the preceding claims, wherein the one-way valve is disposed within the cavity.

[0040] Optionally, the housing is further provided with a first air intake pipe at the air inlet, and the first air intake pipe is connected to the air intake end cover.

[0041] Optionally, the air intake end cover includes an end cover body and an air intake pipe, wherein the air intake pipe is disposed through the end cover body;

[0042] The intake pipe is connected to the first intake pipe.

[0043] Optionally, the muffler further includes a silicone connecting tube, which is sleeved on at least a portion of the first air intake pipe and the air intake fitting to connect the first air intake pipe and the air intake fitting.

[0044] Optionally, the exhaust end cap is provided with a plurality of second exhaust holes, each of which communicates with the cavity.

[0045] Optionally, a plurality of guide plates are provided at one end of the cylinder near the exhaust end cap, and the plurality of guide plates are alternately arranged on the inner wall of the cylinder along the extension direction of the cylinder.

[0046] Optionally, sound-absorbing cotton is provided between the cylinder and the one-way valve.

[0047] Thirdly, this application also discloses a muffler, the muffler comprising:

[0048] A cylindrical body, wherein a cavity is formed inside the cylindrical body;

[0049] An air inlet port and an air outlet port are provided on the cylinder body, wherein the air inlet port is connected to the air inlet port; and the air outlet port is connected to the cavity.

[0050] A plurality of guide plates are provided at one end of the cylinder near the air outlet port, and the plurality of guide plates are alternately arranged on the inner wall of the cylinder along the extension direction of the cylinder.

[0051] And the one-way valve described in any of the preceding claims, wherein the one-way valve is disposed within the cavity.

[0052] Fourthly, this application also discloses an oxygen generator, which includes the silencer described in any of the above claims.

[0053] In this embodiment, the one-way valve includes a housing, a gravity valve stem assembly, and a silencer filter element. The housing has an air inlet. The gravity valve stem assembly is movably connected within the housing and is used to open and close the air inlet. The silencer filter element is disposed between the gravity valve stem assembly and the housing. The inner wall of the silencer filter element and at least a portion of the housing enclose a first air chamber, which communicates with the air inlet. At least a portion of the housing has several first exhaust holes at positions corresponding to the outer wall of the silencer filter element, so that the gas medium entering the first air chamber from the air inlet flows sequentially through the silencer filter element and the first exhaust holes before being discharged. Thus, on the one hand, due to the gravity valve stem assembly, the air inlet can be opened and closed by its own weight, thereby achieving unidirectional flow of the gas medium. On the other hand, due to the inclusion of a silencer filter element, the inner wall of the silencer filter element and at least a portion of the housing enclose a first air chamber, which communicates with the air inlet. At least a portion of the housing has several first exhaust holes at positions corresponding to the outer wall of the silencer filter element. Therefore, when the high-pressure gas medium enters the first air chamber through the air inlet, it flows sequentially through the silencer filter element and the first exhaust holes. The silencer filter element has numerous pores, providing resistive noise reduction, while the first exhaust holes provide small-hole noise reduction. Thus, the combined effect of the silencer filter element and the first exhaust holes reduces the noise generated by the gas medium. In summary, the one-way valve of this embodiment can simultaneously achieve one-way exhaust and noise reduction without requiring additional noise reduction components, which helps reduce the manufacturing cost of the oxygen concentrator.

[0054] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0055] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0056] Figure 1 This is one of the structural schematic diagrams of a one-way valve provided in the embodiments of this application;

[0057] Figure 2 This is a second schematic diagram of the structure of a one-way valve provided in the embodiments of this application;

[0058] Figure 3 This is a schematic diagram of the housing of a one-way valve provided in an embodiment of this application;

[0059] Figure 4 This is a schematic diagram of the structure of a silencer filter element for a one-way valve provided in an embodiment of this application;

[0060] Figure 5This is a schematic diagram of the structure of a gravity valve stem assembly of a one-way valve provided in an embodiment of this application;

[0061] Figure 6 This is one of the structural schematic diagrams of a silencer provided in the embodiments of this application;

[0062] Figure 7 This is the second schematic diagram of a silencer provided in the embodiments of this application.

[0063] Reference numerals: 10. One-way valve, 11. Housing, 111. Air inlet, 112. First air inlet pipe, 113. First exhaust port, 114. First top wall, 1141. Reset hole, 115. Side wall, 1151. First side wall, 1152. Second side wall, 116. Guide limiting structure, 1161. Guide cylinder, 1162. Guide limiting block, 117. First boss, 118. Upper housing, 119. Lower housing, 12. Gravity valve 121. Valve stem, 1211. Guide limiting groove, 1212. Groove, 122. Sealing ring, 13. Silencing filter element, 131. Second top wall, 1311. Mounting hole, 132. Third side wall, 20. Inlet end cap, 21. End cap body, 22. Inlet pipe fitting, 221. First pipe section, 222. Second pipe section, 30. Exhaust end cap, 31. Second exhaust hole, 40. Cylinder, 41. Guide plate, 50. Silicone connecting pipe. Detailed Implementation

[0064] Embodiments of the present invention will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0065] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this invention, unless otherwise stated, "a plurality of" means two or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0066] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0067] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0068] This application provides a one-way valve, which will be described in detail below with reference to the accompanying drawings.

[0069] Reference Figures 1 to 2 The diagram shows a schematic representation of a one-way valve according to an embodiment of this application. Figures 3 to 5 The diagrams show the structural schematics of the housing, silencer filter element, and gravity valve stem assembly of a one-way valve according to an embodiment of this application. Figures 6 to 7 The diagram shows a schematic representation of a silencer provided in an embodiment of this application.

[0070] like Figures 1 to 2 As shown, this application provides a one-way valve, including a housing 11, a gravity valve stem assembly 12, and a silencer filter element 13; the housing 11 is provided with an air inlet 111; the gravity valve stem assembly 12 is movably connected inside the housing 11 and is used to open or close the air inlet 111; the silencer filter element 13 is disposed between the gravity valve stem assembly 12 and the housing 11, and the inner wall of the silencer filter element 13 and at least a portion of the housing 11 enclose a first air chamber, which communicates with the air inlet 111; at least a portion of the housing 11 is provided with a plurality of first exhaust holes 113 at positions corresponding to the outer wall of the silencer filter element 13, so that the gas medium entering the first air chamber from the air inlet 111 flows sequentially through the silencer filter element 13 and the first exhaust holes 113 before being discharged.

[0071] In this embodiment, on the one hand, due to the gravity valve stem assembly 12, the gravity valve stem assembly 12 can open and close the air inlet 111 by its own weight, thereby enabling unidirectional flow of the gas medium. On the other hand, due to the silencing filter element 13, the inner wall of the silencing filter element 13 and at least a portion of the housing 11 enclose a first air chamber, which is connected to the air inlet 111. At least a portion of the housing 11 has several first exhaust holes 113 at positions corresponding to the outer wall of the silencing filter element 13. Therefore, when the high-pressure gas medium enters the first air chamber through the air inlet 111, it will flow through the silencing filter element 13 and the first exhaust holes 113 in sequence. The silencing filter element 13 has a large number of pores, which plays a resistive noise reduction role, and the first exhaust holes 113 play a small-hole noise reduction role. That is, under the combined action of the silencing filter element 13 and the first exhaust holes 113, the noise generated by the gas medium is reduced.

[0072] In summary, the one-way valve 10 of this application embodiment can simultaneously achieve the functions of one-way exhaust and noise reduction, without the need for additional silencer components, which helps to reduce the manufacturing cost of the oxygen generator.

[0073] It should be noted that, in this embodiment, the silencer filter element 13 refers to a structure with numerous small through holes that allow gas flow. When the high-pressure gas medium passes through the through holes, it rubs against the holes, thereby converting some energy into heat energy for dissipation, thus achieving a resistive noise reduction effect. In one embodiment, the silencer filter element 13 is a porous sintered filter element. A porous sintered filter element refers to a filter element formed through a sintering process. It can be made of metal, such as titanium or aluminum, or non-metallic materials, such as ceramics or plastics. This embodiment does not limit the material of the silencer filter element 13. Furthermore, in this embodiment, the gravity valve stem assembly 12 refers to a valve stem 121 assembly that relies on gravity to open or close the air inlet 111. When the gravity of the gravity valve stem assembly 12 is greater than the air inlet pressure, the air inlet 111 is in a closed state; when the gravity of the gravity valve stem assembly 12 is less than the air inlet pressure, the air inlet 111 is in an open state.

[0074] In practical applications, at least a portion of the housing 11 and the silencer filter element 13 can be spaced apart or fitted together; this is not limited here, and those skilled in the art can adjust it according to actual needs. It is understood that when at least a portion of the housing 11 and the silencer filter element 13 are spaced apart, the inner wall of at least a portion of the housing 11 and the outer wall of the silencer filter element 13 form a closed second air chamber. This allows the first and second air chambers to be separated, and the high-pressure gas medium entering from the air inlet 111 can flow sequentially through the silencer filter element 13 and the first exhaust port 113 provided on the housing 11, thereby reducing the noise generated by the high-pressure gas medium.

[0075] like Figure 3As shown, the extension direction of the housing 11 is the first direction. Along the first direction, the housing 11 has a first end and a second end that are set opposite to each other. The air inlet 111 is set at the second end. The first end is provided with a first top wall 114. A guide limiting structure 116 is provided on the side of the first top wall 114 near the air inlet 111. Along the first direction, the gravity valve stem assembly 12 is slidably connected to the guide limiting structure 116 to open or close the air inlet 111.

[0076] In this embodiment, due to the provision of the guide limiting structure 116, the gravity valve stem assembly 12 is slidably connected to the guide limiting structure 116, thereby guiding the gravity valve stem assembly 12 to move along the first direction and limiting the movement stroke of the gravity valve stem assembly 12, thus playing a role in orientation and distance control. During the use of the one-way valve 10, when the inlet pressure of the high-pressure gas medium acting on the gravity valve stem assembly 12 is greater than the weight of the gravity valve stem assembly 12, the high-pressure gas medium pushes the gravity valve stem assembly 12 to move away from the inlet 111, causing the inlet 111 to open, and the high-pressure gas medium flows into the one-way valve 10 from the gap between the inlet 111 and the gravity valve stem assembly 12; as the inlet pressure decreases, the gravity valve stem assembly 12 moves towards the inlet 111 under the action of gravity, and when the inlet pressure decreases to less than the weight of the gravity valve stem 121, the gravity valve stem assembly 12 closes the inlet 111.

[0077] It should be noted that the gravity of the gravity valve stem assembly 12 can be customized by those skilled in the art according to actual needs, so as to adapt to high-pressure gas media of different pressures.

[0078] Furthermore, the guide limiting structure 116 includes a guide cylinder 1161, one end of which is fixed to the first top wall 114; the inner wall of the guide cylinder 1161 is provided with a guide limiting block 1162 extending in a first direction, and the gravity valve stem assembly 12 is slidably connected to the guide limiting block 1162 in the first direction to open or close the air inlet 111; or, the inner wall of the guide cylinder 1161 is provided with a guide limiting groove 1211 extending in the first direction, and the gravity valve stem assembly 12 is slidably connected to the guide limiting groove 1211 in the first direction to open or close the air inlet 111.

[0079] In this embodiment, since the guide limiting structure 116 includes a guide cylinder 1161, and the inner wall of the guide cylinder 1161 is provided with a guide limiting block 1162 or a guide limiting groove 1211 extending in the first direction, the gravity valve stem assembly 12 can slide relative to the guide limiting block 1162 or the guide limiting groove 1211 in the first direction, thereby realizing the opening or closing of the air inlet 111.

[0080] It should be noted that the accompanying drawings of this application embodiment only show the case where the guide limiting block 1162 is provided on the inner wall of the guide cylinder 1161. In practical applications, those skilled in the art can also provide a guide limiting groove 1211 on the inner wall of the guide cylinder 1161 according to actual needs, so that the gravity valve rod assembly 12 can be slidably connected to the guide limiting groove 1211 along the first direction. This application embodiment does not limit this. In addition, one or more guide limiting blocks 1162 or guide limiting grooves 1211 can be provided. This application embodiment does not limit the number of guide limiting blocks 1162 or guide limiting grooves 1211 provided, and those skilled in the art can adjust it according to actual needs. It is understood that when multiple guide limiting blocks 1162 or guide limiting grooves 1211 are provided, they should be evenly distributed around the circumference of the inner wall of the guide cylinder 1161. This can prevent the gravity valve rod assembly 12 from tilting during movement.

[0081] In some optional embodiments of this application, the first top wall 114 is provided with a reset hole 1141, which communicates with the guide cylinder 1161. Because the reset hole 1141 communicates with the guide cylinder 1161, the gas medium remaining in the gas cylinder 1161 can be prevented from forming a gas blockage, thus avoiding affecting the movement and reset of the gravity valve stem assembly 12.

[0082] It should be noted that, without affecting the movement and reset of the gravity valve stem assembly 12, the reset hole 1141 can be provided as one, two or more, and this is not limited here. Those skilled in the art can adjust it according to actual needs.

[0083] In some alternative embodiments of this application, the housing 11 further includes a side wall 115, which extends from the periphery of the first top wall 114 toward the air inlet 111; a first boss 117 is provided on the inner side of the side wall 115, which is used to support the silencer filter element 13.

[0084] In this embodiment, since a first protrusion 117 is provided on the inner side of the sidewall 115, it can support the noise-absorbing filter element 13, which is beneficial to improving the installation reliability of the noise-absorbing filter element 13.

[0085] It should be noted that, in cases where at least part of the inner wall of the housing 11 and the outer wall of the silencer filter element 13 enclose to form a second air chamber, in order to separate the first air chamber and the second air chamber so that the high-pressure gas medium flows sequentially through the silencer filter element 13 and the first exhaust port 113, the first boss 117 of this application embodiment is provided in a circle around the side wall 115. In this way, there are no gaps between the silencer filter element 13 and the first boss 117, which can effectively prevent the high-pressure gas medium from directly entering the second air chamber, thereby reducing the noise reduction effect.

[0086] Specifically, along the first direction, the sidewall 115 includes a first sidewall 1151 and a second sidewall 1152 arranged sequentially, with the second sidewall 1152 facing away from the first top wall 114; a first vent 113 is disposed on the first sidewall 1151, and a first boss 117 is disposed on the second sidewall 1152.

[0087] It should be noted that the plurality of first exhaust holes 113 provided on the first sidewall 1151 can be arranged at uniform intervals or at non-uniform intervals; this is not limited here. It is understood that when the plurality of first exhaust holes 113 are arranged at uniform intervals on the first sidewall 1151, it is beneficial to exhaust stability. In addition, the first boss 117 can be integrally formed with the second sidewall 1152 or separately formed. It is understood that compared with separate forming, the first boss 117 and the second sidewall 1152 are integrally formed, which has higher mechanical strength and is beneficial to improving the service life of the one-way valve 10.

[0088] In some alternative embodiments of this application, along a first direction, the second sidewall 1152 has a third end and a fourth end disposed opposite to each other, the fourth end being opposite to the first sidewall 1151; along the direction from the third end to the fourth end, the size of at least a portion of the second sidewall 1152 decreases sequentially.

[0089] In this embodiment, since the size of at least part of the second sidewall 1152 decreases sequentially along the direction from the third end to the fourth end, that is, at least part of the second sidewall 1152 is in the shape of an inverted frustum, the air inlet 111 can be closed when the gravity valve rod assembly 12 abuts against the frustum surface.

[0090] like Figure 4 As shown, the noise-absorbing filter element 13 includes a second top wall 131 perpendicular to the first direction, and a third side wall 132 extending from the periphery of the second top wall 131 toward the air inlet 111; the second top wall 131 has a mounting hole 1311, and the guide limiting structure 116 passes through the mounting hole 1311; the end of the third side wall 132 facing away from the second top wall 131 abuts against the first boss 117.

[0091] In this embodiment, the second top wall 131 of the noise-absorbing filter element 13 has a mounting hole 1311, through which the guide limiting structure 116 passes, facilitating the installation and positioning of the noise-absorbing filter element 13. Furthermore, the end of the third side wall 132 of the noise-absorbing filter element 13 facing away from the second top wall 131 abuts against the first boss 117, further supporting and fixing the noise-absorbing filter element 13. That is, through its connection with the guide limiting structure 116 and the first boss 117, the noise-absorbing filter element 13 can be reliably connected within the housing 11.

[0092] It should be noted that, in order to facilitate the positioning and assembly of the components of the one-way valve 10, the housing 11, air inlet 111, gravity valve stem assembly 12, guide and limiting structure 116, and silencer filter element 13 of this embodiment all coincide along the axis of the first direction. Furthermore, to prevent high-pressure gas from directly entering the second air chamber through the gap between the mounting hole 1311 and the guide and limiting structure 116, the inner wall of the mounting hole 1311 in this embodiment is fitted against the outer wall of the guide and limiting structure 116.

[0093] like Figure 5 As shown, the gravity valve stem assembly 12 includes a valve stem 121 and a sealing ring 122. Along the first direction, the valve stem 121 has a fifth end and a sixth end that are arranged opposite to each other, with the sixth end close to the air inlet 111. The fifth end is provided with a guide limiting groove 1211 extending along the first direction. Along the first direction, the guide limiting groove 1211 is slidably connected to the guide limiting structure 116 to open or close the air inlet 111. The sixth end is provided with a groove 1212, and the sealing ring 122 is embedded in the groove 1212. When the sealing ring 122 abuts against the second side wall 1152, the air inlet 111 is closed. When the sealing ring 122 is released from contact with the second side wall 1152, the air inlet 111 is open.

[0094] In this embodiment, the gravity valve stem assembly 12 includes a valve stem 121 and a sealing ring 122. The fifth end of the valve stem 121 is provided with a guide limiting groove 1211 extending in the first direction. The guide limiting groove 1211 is slidably connected to the guide limiting block 1162 of the guide limiting structure 116 in the first direction, thereby enabling the valve stem 121 to move in the first direction. Since the sixth end of the valve stem 121 is provided with a groove 1212 and the sealing ring 122 is embedded in the groove 1212, when the air inlet 111 is closed, under the gravity of the gravity valve stem assembly 12, the sealing ring 122 abuts against the second side wall 1152 to prevent high-pressure gas medium from entering; when the pressure of the high-pressure gas medium acting on the gravity valve stem assembly 12 is greater than the gravity of the gravity valve stem assembly 12, under the air inlet pressure, the sealing ring 122 moves away from the second side wall 1152, so that the air inlet 111 opens, and the high-pressure gas medium flows into the one-way valve 10 from the annular airflow channel formed between the sealing ring 122 and the second side wall 1152, and then flows through the silencer filter element 13 and the first exhaust hole 113 in sequence before being discharged.

[0095] In some optional embodiments of this application, the gravity valve stem assembly 12 includes a valve stem 121 and a sealing ring 122; along a first direction, the valve stem 121 has a fifth end and a sixth end disposed opposite to each other, the sixth end being close to the air inlet 111; the fifth end is provided with a guide limiting groove 1211 extending along the first direction, the guide limiting groove 1211 being slidably connected to the guide limiting structure 116 along the first direction to open or close the air inlet 111; the sixth end has an abutment surface; the second sidewall 1152 is provided with a second boss, the sealing ring 122 is fixedly connected to the second boss, and the air inlet 111 is closed when the abutment surface abuts against the sealing ring 122, and the air inlet 111 is opened when the abutment surface is released from the sealing ring 122.

[0096] In this embodiment, the gravity valve stem assembly 12 includes a valve stem 121 and a sealing ring 122. The fifth end of the valve stem 121 is provided with a guide limiting groove 1211 extending in the first direction. The guide limiting groove 1211 is slidably connected to the guide limiting block 1162 of the guide limiting structure 116 in the first direction, thereby enabling the valve stem 121 to move in the first direction. Because the sixth end of the valve stem 121 has an abutment surface, and the second side wall 1152 is provided with a second boss, the sealing ring 122 is fixed to the second boss. When the air inlet 111 is closed, under the gravity of the gravity valve stem assembly 12, the abutment surface abuts against the sealing ring 122 to prevent high-pressure gas medium from entering. When the pressure of the high-pressure gas medium acting on the gravity valve stem assembly 12 is greater than the gravity of the gravity valve stem assembly 12, under the air inlet pressure, the valve stem 121 moves away from the sealing ring 122, so that the valve stem 121 disengages from the sealing ring 122, the air inlet 111 opens, and the high-pressure gas medium flows from the hollow area of ​​the sealing ring 122 into the one-way valve 10, and then flows through the silencer filter element 13 and the first exhaust hole 113 in sequence before being discharged.

[0097] It should be noted that the accompanying drawings of this application embodiment only show the case where the fifth end of the valve stem 121 is provided with a guide limiting groove 1211. In actual applications, those skilled in the art can also provide a guide limiting block 1162 extending in the first direction at the fifth end of the valve stem 121 according to actual needs, so that the gravity valve stem assembly 1212 is slidably connected to the guide limiting structure 116. It is understood that one of the guide limiting groove 1211 and the guide limiting block 1162 is provided at the fifth end of the valve stem 121, and the other is correspondingly provided on the inner wall of the guide cylinder 1161. In addition, the sealing ring 122 in this application embodiment is preferably an O-ring sealing ring 122 with low motion friction resistance and self-sealing performance.

[0098] In practical applications, to avoid the valve stem 121 frequently opening and impacting the first top wall 114, the length of the guide limiting groove 1211 on the valve stem 121 along the first direction should be less than the length of the guide cylinder 1161 along the first direction. In addition, to reduce airflow resistance, the end of the valve stem 121 near the air inlet 111 can extend towards the air inlet 111 to form a conical surface.

[0099] In practical applications, the second protrusion can be a protrusion structure formed by at least a portion of the second sidewall 1152 contracting towards the center of the second sidewall 1152, or it can be a protrusion structure directly set on the inner side of the second sidewall 1152. No limitation is made here, and those skilled in the art can set it according to actual needs. Furthermore, the abutment surface can be the end face of the valve stem 121 or the side wall surface of the valve stem 121. When the abutment surface is the end face of the valve stem 121, the end face of the valve stem 121 abuts against the upper wall surface of the sealing ring 122, that is, the wall surface of the sealing ring 122 near the valve stem 121. In one embodiment, the end face of the valve stem 121 has a flat surface. In this embodiment, the central axis of the valve stem 121 and the central axis of the sealing ring 122 do not need to be completely aligned to achieve sealing, resulting in higher flexibility. When the abutment surface is the side wall surface of the valve stem 121, the side wall surface of the valve stem 121 abuts against the inner wall surface of the sealing ring 122. This method provides higher sealing stability.

[0100] In some optional embodiments of this application, the extending direction of the housing 11 is a first direction, and the housing 11 includes an upper housing 118 and a lower housing 119 disposed along the first direction; the upper housing 118 and the lower housing 119 are detachably connected.

[0101] In this embodiment, the housing 11 is composed of a detachable upper housing 118 and a lower housing 119, which facilitates the assembly of the one-way valve 10 and the maintenance and replacement of its components.

[0102] It should be noted that the detachable connection method between the upper housing 118 and the lower housing 119 can be threaded connection, snap-fit ​​connection or other connection methods, which are not limited here.

[0103] In summary, the one-way valve provided in this application embodiment has at least the following advantages:

[0104] In this embodiment, the one-way valve includes a housing, a gravity valve stem assembly, and a silencer filter element. The housing has an air inlet. The gravity valve stem assembly is movably connected within the housing and is used to open and close the air inlet. The silencer filter element is disposed between the gravity valve stem assembly and the housing. The inner wall of the silencer filter element and at least a portion of the housing enclose a first air chamber, which communicates with the air inlet. At least a portion of the housing has several first exhaust holes at positions corresponding to the outer wall of the silencer filter element, so that the gas medium entering the first air chamber from the air inlet flows sequentially through the silencer filter element and the first exhaust holes before being discharged. Thus, on the one hand, due to the gravity valve stem assembly, the gravity valve stem assembly can open and close the air inlet by its own weight, thereby enabling unidirectional flow of the high-pressure gas medium. On the other hand, due to the inclusion of a silencer filter element, the inner wall of the silencer filter element and at least a portion of the housing enclose a first air chamber, which communicates with the air inlet. At least a portion of the housing has several first exhaust holes at positions corresponding to the outer wall of the silencer filter element. Therefore, when the high-pressure gas medium enters the first air chamber through the air inlet, it flows sequentially through the silencer filter element and the first exhaust holes. The silencer filter element has numerous pores, providing resistive noise reduction, while the first exhaust holes provide small-hole noise reduction. Thus, under the combined action of the silencer filter element and the first exhaust holes, the noise generated by the high-pressure gas medium is reduced. In summary, the one-way valve of this embodiment can simultaneously achieve one-way exhaust and noise reduction without requiring additional noise reduction components, which helps reduce the manufacturing cost of the oxygen concentrator.

[0105] like Figures 6 to 7 As shown, this application embodiment also provides a muffler, which includes: an air inlet end cap 20 and an exhaust end cap 30 disposed opposite to each other; a cylinder 40 disposed between the air inlet end cap 20 and the exhaust end cap 30, the cylinder 40, the air inlet end cap 20, and the exhaust end cap 30 forming a cavity; and a one-way valve 10 of any of the above embodiments, the one-way valve 10 being disposed in the cavity, and the housing 11 also having a first air inlet pipe 112 at the air inlet 111, the first air inlet pipe 112 being connected to the air inlet end cap 20.

[0106] In this embodiment, the silencer includes an inlet cap 20, an exhaust cap 30, and a cylinder 40. The inlet cap 20, exhaust cap 30, and cylinder 40 form a cavity, within which a one-way valve 10 is installed. The first inlet pipe 112 of the one-way valve 10 is connected to the inlet cap 20. Thus, when the silencer is installed in the nitrogen discharge channel of the oxygen generator, the high-pressure gas medium flows in from the inlet cap 20 and sequentially flows through the one-way valve 10, the cavity area outside the one-way valve 10, and is discharged through the exhaust cap 30. On one hand, because the one-way valve 10 has a one-way conduction function, it can prevent the high-pressure gas medium from convection to the molecular sieve of the oxygen generator, thus preventing accelerated aging of the molecular sieve. Simultaneously, it can completely isolate the molecular sieve in the oxygen generator's adsorption tower from the outside air, preventing outside air from flowing from the outlet to the inlet and then entering the adsorption tower to contact the molecular sieve and cause it to fail. On the other hand, since the one-way valve 10 has a noise reduction function, it can effectively reduce the noise generated during nitrogen emission. In addition, after the noise-reduced high-pressure gas medium flows into the cavity, the flow rate decreases, which can further reduce noise.

[0107] It should be noted that in this embodiment, the structure of the one-way valve 10 is the same as that of the one-way valve 10 in any of the above embodiments, and its beneficial effects are similar, so it will not be described in detail here. In addition, both the air inlet cap 20 and the exhaust cap 30 can be detachably connected to the cylinder 40. The detachable connection method between the air inlet cap 20 and the cylinder 40, and between the exhaust cap 30 and the cylinder 40, can be a threaded connection, a snap-fit ​​connection, or other connection methods, which are not limited here.

[0108] Specifically, the air intake end cover 20 includes an end cover body 21 and an air intake pipe 22, which is disposed through the end cover body 21; the air intake pipe 22 is connected to the first air intake pipe 112.

[0109] In this embodiment, since an air inlet pipe 22 is provided that penetrates the end cap body 21, the air inlet pipe 22 can connect the nitrogen emission channel of the oxygen generator and the one-way valve 10, so that the high-pressure gas medium first enters the one-way valve 10, realizing the one-way flow of high-pressure gas and noise reduction.

[0110] It should be noted that the intake pipe 22 can consist of one pipe or at least two pipes. This application does not limit the specific composition of the intake pipe 22, and those skilled in the art can customize it according to actual needs. In one embodiment, the intake pipe 22 consists of at least two pipes, including a first pipe section 221 and a second pipe section 222 arranged sequentially along the extension direction of the intake pipe 22. The first pipe section 221 is located on the side of the end cap body 21 near the cylinder 40, and the end of the first pipe section 221 near the end cap body 21 penetrates the end cap body 21. The inner wall of the first pipe section 221 is provided with a first thread. The second pipe section 222 is located on the side of the end cap body 21 away from the cylinder 40, and the outer wall of the end of the second pipe section 222 near the end cap body 21 is provided with a second thread. The second thread engages with the first thread to connect the first pipe section 221 and the second pipe section 222.

[0111] In some alternative embodiments of this application, the muffler further includes a silicone connecting tube 50, which is sleeved on at least a portion of the first air intake pipe 112 and the air intake fitting 22 to connect the first air intake pipe 112 and the air intake fitting 22.

[0112] In this embodiment, since a silicone connecting tube 50 is provided, the silicone connecting tube 50 itself has a certain deformation capability. When the silicone connecting tube 50 is sleeved on at least part of the first air inlet pipe 112 and the air inlet pipe fitting 22, the silicone connecting tube 50 can deform to make its inner wall fit with the outer wall of the first air inlet pipe 112 and the air inlet pipe fitting 22, thereby realizing the connection between the first air inlet pipe 112 and the air inlet pipe fitting 22 and improving the airtightness of the connection.

[0113] It should be noted that, along the extending direction of the first air intake pipe 112, at least one annular protrusion is provided at intervals on the outer wall of the first air intake pipe 112. The diameter of the annular protrusion on the side closer to the air inlet 111 is larger than the diameter of the annular protrusion on the side farther from the air inlet 111. This facilitates the connection of the silicone connecting tube 50 to the first air intake pipe 112, while preventing the silicone connecting tube 50 from detaching, thereby effectively improving the connection reliability between the first air intake pipe 112 and the silicone connecting tube 50.

[0114] In some optional embodiments of this application, the exhaust end cap 30 is provided with a plurality of second exhaust holes 31, each of which communicates with the cavity.

[0115] In this embodiment, since the exhaust end cap 30 is provided with multiple second exhaust holes 31 that communicate with the cavity, the high-pressure gas medium that is guided and reduced by the one-way valve 10 enters the cavity and is discharged from the second exhaust holes 31. Under the sound-absorbing effect of the small holes in the second exhaust holes 31, secondary noise reduction can be achieved.

[0116] In some optional embodiments of this application, a plurality of guide plates 41 are provided at one end of the cylinder 40 near the exhaust end cap 30; the plurality of guide plates 41 are alternately arranged on the inner wall of the cylinder 40 along the extension direction of the cylinder 40.

[0117] In this embodiment, since multiple guide plates 41 are provided and are alternately arranged on the inner wall of the cylinder 40 along the extension direction of the cylinder 40, the guide plates 41 have the function of guiding airflow. When the high-pressure gas medium, which is guided and reduced by the one-way valve 10, flows upward, it will pass around in the guiding channel formed by the multiple guide plates 41 in turn, further reducing the flow rate of the high-pressure gas medium, which is conducive to further reducing the noise of the high-pressure gas medium.

[0118] It should be noted that, in order to further improve the gas circulation effect, the projections of two adjacent guide plates 41 in the first direction have overlapping parts, and the two projections, when superimposed along the first direction, are consistent with the opening size of the cylinder 40.

[0119] In some optional embodiments of this application, sound-absorbing cotton is provided between the cylinder 40 and the one-way valve 10. In this way, when the high-pressure gas medium, which has been guided and noise-reduced by the one-way valve 10, is discharged from the first exhaust port 113, it will flow through the sound-absorbing surface. Under the sound-absorbing effect of the sound-absorbing cotton, the noise of the high-pressure gas medium is further reduced.

[0120] It should be noted that sound-absorbing cotton is a material that can absorb or block sound. It can be felt, glass wool, polyurethane foam, foamed fiber aluminum board or other types of materials. There are no limitations here. Those skilled in the art can choose according to actual needs.

[0121] This application embodiment also provides a silencer, which includes: a cylinder 40, with a cavity formed inside the cylinder 40; an air inlet port and an air outlet port disposed on the cylinder 40, the air inlet port communicating with an air inlet 111; the air outlet port communicating with the cavity; a plurality of guide plates 41 disposed at one end of the cylinder 40 near the air outlet port, the plurality of guide plates 41 being alternately disposed on the inner wall of the cylinder 40 along the extending direction of the cylinder 40; and a one-way valve 10 of any of the above embodiments, the one-way valve 10 being disposed inside the cavity.

[0122] In this embodiment, the silencer includes a cylinder 40 with an inlet and an outlet. A one-way valve 10 is installed inside the cavity of the cylinder 40, with its inlet 111 connected to the inlet port. Thus, when the silencer is installed in the nitrogen emission channel of the oxygen generator, the high-pressure gas medium flows in through the inlet port, sequentially passing through the one-way valve 10, the cavity area outside the one-way valve 10, and then exiting through the outlet port. On one hand, because the one-way valve 10 has a one-way flow function, it prevents the high-pressure gas medium from convection to the molecular sieve of the oxygen generator, thus preventing accelerated aging of the molecular sieve. Simultaneously, it completely isolates the molecular sieve in the oxygen generator's adsorption tower from the outside air, preventing outside air from flowing from the outlet to the inlet 111 and entering the adsorption tower to contact the molecular sieve and cause it to fail. On the other hand, because the one-way valve 10 has a noise reduction function, it can effectively reduce the noise generated during nitrogen emission. Furthermore, after the noise-reduced high-pressure gas medium flows into the cavity, its flow velocity decreases, thereby further reducing noise. Because multiple guide plates 41 are provided, and these guide plates 41 are alternately arranged along the extension direction of the cylinder 40 on its inner wall, the guide plates 41 have an airflow guiding function. When the noise-reduced high-pressure gas medium flows upward through the one-way valve 10, it will sequentially bypass the flow channels formed by the multiple guide plates 41, further reducing the flow velocity of the high-pressure gas medium and thus further reducing its noise.

[0123] It should be noted that in this embodiment, the shape of the guide plate 41 can be set in various ways, and can be a regular shape or an irregular shape, such as a rectangle, an arc, a streamline, etc., which is not limited here.

[0124] The structure of the one-way valve 10 is the same as that of the one-way valve 10 in any of the above embodiments, and its beneficial effects are also similar, so it will not be described in detail here.

[0125] This application also provides an oxygen generator, which includes the silencer described in any of the above embodiments. Installing this silencer in the nitrogen emission channel of the oxygen generator not only prevents outside air from flowing from the outlet side to the inlet side and entering the adsorption tower to contact the molecular sieve and cause it to fail, but also effectively reduces the noise generated during nitrogen emission. This not only ensures the performance of the oxygen generator but also effectively reduces costs.

[0126] It should be noted that in this embodiment, the structure of the muffler is the same as that of the muffler in any of the above embodiments, and its beneficial effects are similar, so it will not be described in detail here.

[0127] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0128] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A one-way valve characterized by, The one-way valve comprises a shell, a gravity valve rod assembly and a sound-absorbing filter element; The shell is provided with an air inlet; The gravity valve rod assembly is movably connected in the shell, and is used for opening or closing the air inlet to realize one-way flow of gas medium; when the air inlet pressure is greater than the gravity of the gravity valve rod assembly, the gravity valve rod assembly moves away from the air inlet to open the air inlet; when the air inlet pressure is less than the gravity of the gravity valve rod assembly, the gravity valve rod assembly closes the air inlet; the extension direction of the shell is a first direction, along the first direction, the shell has a first end and a second end which are arranged away from each other, and the air inlet is arranged at the second end; the first end is provided with a first top wall, and a guide limiting structure is arranged on the side of the first top wall close to the air inlet; along the first direction, the gravity valve rod assembly is slidably connected to the guide limiting structure to open or close the air inlet; The sound-absorbing filter element is arranged between the gravity valve rod assembly and the shell, and an inner wall of the sound-absorbing filter element and at least part of the shell form a first air cavity; the first air cavity is in communication with the air inlet; at least part of the shell is provided with a plurality of first exhaust holes at positions corresponding to the outer wall of the sound-absorbing filter element, so that the gas medium entering the first air cavity from the air inlet flows through the sound-absorbing filter element and the first exhaust holes in sequence and is then discharged; At least part of the shell is spaced apart from the sound-absorbing filter element, and an inner wall of at least part of the shell and an outer wall of the sound-absorbing filter element form a closed second air cavity; the shell further comprises a side wall extending from the periphery of the first top wall towards the air inlet; an inner side of the side wall is provided with a first boss for supporting the sound-absorbing filter element; the first boss is arranged in a circle along the periphery of the side wall.

2. The one-way valve of claim 1, wherein The guide limiting structure comprises a guide cylinder, and one end of the guide cylinder is fixedly connected to the first top wall; An inner wall of the guide cylinder is provided with a guide limiting block extending along the first direction, and the gravity valve rod assembly is slidably connected to the guide limiting block along the first direction to open or close the air inlet; Alternatively, an inner wall of the guide cylinder is provided with a guide limiting groove extending along the first direction, and the gravity valve rod assembly is slidably connected to the guide limiting groove along the first direction to open or close the air inlet.

3. The one-way valve of claim 2, wherein, The first top wall is provided with a reset hole in communication with the guide cylinder.

4. The one-way valve of claim 1, wherein Along the first direction, the side wall comprises a first side wall and a second side wall arranged in sequence, and the second side wall is away from the first top wall; The first exhaust hole is arranged on the first side wall, and the first boss is arranged on the second side wall.

5. The one-way valve of claim 4, wherein, Along the first direction, the second side wall has a third end and a fourth end arranged away from each other, and the fourth end is away from the first side wall; Along the direction from the third end to the fourth end, the size of at least part of the second side wall decreases in sequence.

6. The one-way valve according to claim 4 or 5, characterized in that The sound-absorbing filter core comprises a second top wall perpendicular to the first direction, and a third side wall extending from the periphery of the second top wall towards the air inlet; The second top wall is provided with a mounting hole, and the guide limiting structure is arranged in the mounting hole; One end of the third side wall away from the second top wall is in abutment with the first boss.

7. The one-way valve according to claim 4 or 5, characterized in that The gravity valve rod assembly comprises a valve rod and a sealing ring; In the first direction, the valve rod has a fifth end and a sixth end arranged away from each other, and the sixth end is close to the air inlet; The fifth end is provided with a guide limiting groove extending in the first direction, and the guide limiting groove is in sliding connection with the guide limiting structure in the first direction to open or close the air inlet; The sixth end is provided with a groove, and the sealing ring is embedded in the groove; in the state that the sealing ring is in abutment with the second side wall, the air inlet is closed; and in the state that the sealing ring is out of abutment with the second side wall, the air inlet is opened.

8. The one-way valve of claim 4 or 5, wherein, The gravity valve rod assembly comprises a valve rod and a sealing ring; In the first direction, the valve rod has a fifth end and a sixth end arranged away from each other, and the sixth end is close to the air inlet; The fifth end is provided with a guide limiting groove extending in the first direction, and the guide limiting groove is in sliding connection with the guide limiting structure in the first direction to open or close the air inlet; and the sixth end has an abutment surface; The second side wall is provided with a second boss, and the sealing ring is fixedly connected to the second boss; in the state that the abutment surface is in abutment with the sealing ring, the air inlet is closed; and in the state that the abutment surface is out of abutment with the sealing ring, the air inlet is opened.

9. The one-way valve of claim 1, wherein, The extension direction of the shell is a first direction, and the shell comprises an upper shell and a lower shell arranged in the first direction; The upper shell and the lower shell are detachably connected.

10. The one-way valve of claim 1, wherein, The sound-absorbing filter core is a porous sintered filter core.

11. A muffler characterized by The sound-absorbing device comprises: Oppositely arranged air inlet end cover and air outlet end cover; A cylinder body is arranged between the air inlet end cover and the air outlet end cover, and the cylinder body, the air inlet end cover and the air outlet end cover form a cavity; And the one-way valve of any one of claims 1-10 is arranged in the cavity.

12. The muffler of claim 11, wherein, The shell is further provided with a first air inlet pipe at the air inlet, and the first air inlet pipe is connected with the air inlet end cover.

13. The muffler of claim 12, wherein, The air inlet end cover comprises an end cover body and an air inlet pipe element, and the air inlet pipe element is arranged through the end cover body; The air inlet pipe element is in communication with the first air inlet pipe.

14. The muffler of claim 13, wherein, The sound-absorbing device further comprises a silica gel connecting pipe, which is sleeved on at least part of the first air inlet pipe and the air inlet pipe element to make the first air inlet pipe and the air inlet pipe element communicate.

15. The muffler of claim 11, wherein, The air outlet end cover is provided with a plurality of second air outlet holes, and each second air outlet hole is in communication with the cavity.

16. The muffler of claim 11, wherein The cylinder body is provided with a plurality of guide plates at one end close to the air outlet end cover, and the plurality of guide plates are arranged on the inner wall of the cylinder body in turn and alternately.

17. The muffler of claim 11, wherein The cylinder body and the one-way valve are provided with sound-absorbing cotton therebetween.

18. A muffler characterized by The sound-absorbing device comprises: A cylinder body forms a cavity in the cylinder body; An air inlet port and an air outlet port are arranged on the cylinder, the air inlet port is communicated with the air inlet, and the air outlet port is communicated with the cavity; A plurality of guide plates are arranged on one end of the cylinder close to the air outlet port, and the plurality of guide plates are alternately arranged on the inner wall of the cylinder along the extension direction of the cylinder. The unidirectional valve is arranged in the cavity.

19. An oxygen generator, characterized by comprising: The oxygen generator comprises the silencer according to any one of claims 11-18.

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