Lightweight VPSA (Vacuum Pressure Swing Adsorption) oxygen generator

Abstract

The utility model discloses a gentle-tone VPSA oxygen generator, and belongs to the technical field of medical and household oxygen generators. The gentle-tone VPSA oxygen generator comprises a shell, a base, a console, a molecular sieve tank group, a fan cabin, an air compressor cabin, an air inlet silencing assembly and an exhaust silencing assembly. Wherein the shell is provided with an air inlet and a secondary filtering cabin. An outlet of the second-stage filtering cabin is connected with an air inlet silencing assembly through an air inlet pipe, and the air inlet silencing assembly is connected with an air inlet pipeline of the air compressor. And the air compressor is connected with the molecular sieve tank group and the exhaust silencing assembly. In-cover sound insulation cotton is arranged in a cover shell of the air compressor cabin, and in-shell sound insulation cotton is arranged in an outer shell. The air inlet silencing assembly comprises a cover plate, an air inlet silencing shell and air inlet silencing cotton. An air guide pipe is arranged on the cover plate, one side of the air guide pipe is connected with the air inlet pipe, the other side of the air guide pipe extends into the air inlet silencing shell, and a flanging is arranged at the end of an extending pipe section and provided with side holes in the circumferential direction. The noise of the light-tone VPSA oxygen generator can be reduced to 30 decibels or below, and the experience feeling of a user can be improved.

Description

Technical Field

[0001] This utility model belongs to the field of medical and home oxygen concentrator technology, specifically relating to a quiet VPSA oxygen concentrator. Background Technology

[0002] The VPSA oxygen concentrator uses pressure adsorption and vacuum desorption to produce oxygen. The VPSA oxygen concentrator compressor has a four-cylinder structure: a positive pressure inlet cylinder, a positive pressure outlet cylinder, a negative pressure inlet cylinder, and a negative pressure outlet cylinder. After entering and undergoing filtration and noise reduction, the air is first compressed in the positive pressure inlet cylinder and then discharged through the positive pressure outlet cylinder into the gas control valve. The gas control valve sends the gas to the molecular sieve tower for adsorption. The nitrogen adsorbed in the molecular sieve tower is then discharged through the gas control valve into the negative pressure inlet cylinder of the compressor for negative pressure desorption. Finally, the nitrogen is discharged through the negative pressure outlet cylinder. This method changes the instantaneous nitrogen discharge of the PSA oxygen concentrator compressor to real-time nitrogen discharge, which is very beneficial for reducing the noise of the oxygen concentrator. Furthermore, the nitrogen desorption is more thorough, greatly reducing the impact on the working efficiency of the molecular sieve in the oxygen concentrator.

[0003] Although VPSA oxygen concentrators effectively reduce noise to around 50 decibels by altering nitrogen emissions, this still has a significant impact on users. Noise reduction remains a long-standing technical challenge in the oxygen concentrator manufacturing industry. The main sources of noise from oxygen concentrators are as follows:

[0004] First, there's the noise from the air compressor itself. When the air compressor is working, the high-speed rotation of the internal motor rotor and other mechanisms causes structural vibrations, generating low- to mid-frequency noise. Simultaneously, the flow of compressed, high-pressure air within the pipes also produces high-frequency turbulence noise. This is the primary source of noise in an oxygen concentrator.

[0005] Second, the intake noise is generated by the continuous airflow and friction between the airflow and the oxygen generator components during the process of air entering the oxygen generator.

[0006] Third, the exhaust noise caused by turbulence due to pressure changes during nitrogen release.

[0007] In addition, there are unconventional noises caused by loose parts. Although various noise reduction methods have been developed, noise from oxygen concentrators is still unavoidable and affects the user experience. Utility Model Content

[0008] (a) Technical problems to be solved

[0009] This invention aims to solve the technical problem of excessive noise in existing VPSA oxygen concentrators, which affects the user experience.

[0010] (II) Technical Solution

[0011] To solve the above-mentioned technical problems, this utility model provides a low-noise VPSA oxygen concentrator, and the specific technical solution adopted is as follows:

[0012] A low-noise VPSA oxygen generator includes a housing, a base installed at the bottom of the housing, a control console installed at the top of the housing, and molecular sieve tanks, a fan compartment, an air compressor compartment, an intake silencer assembly, and an exhaust silencer assembly located inside the housing; the intake silencer assembly and the exhaust silencer assembly are fixedly installed inside the air compressor compartment. The outer shell is equipped with an air inlet and a secondary filter chamber. The outlet of the secondary filter chamber is connected to the air intake silencer assembly via an air intake pipe. The air intake silencer assembly is connected to the air compressor intake pipe in the air compressor compartment. The air compressor is connected to the molecular sieve tank group, supplying compressed air to the molecular sieve tank group, and is connected to the exhaust silencer assembly via an exhaust pipe. Sound insulation cotton is installed inside the cover of the air compressor compartment. Sound insulation cotton is installed between the outer shell and the cover of the air compressor compartment. The air intake silencer assembly includes a cover plate, an air intake silencer housing, and air intake silencer cotton. An air guide pipe is provided on the cover plate, one side of which is connected to the air intake pipe, and the other side extends into the air intake silencer housing, pressing against the air intake silencer cotton located inside the air intake silencer housing. A flange is provided at the end of the section of the air guide pipe extending into the air intake silencer housing, and multiple side holes are provided circumferentially on the extended section.

[0013] Preferably, an air intake grille is provided inside the air intake of the outer casing, and a detachable air intake cover is provided outside the air intake grille; the air intake cover is provided with inwardly recessed side cavities on both sides, a primary filter cotton is provided in the side cavities, and an air intake hole for air circulation is provided on the side cavities; an inner cavity is provided between the two air intake holes, and a primary filter sound insulation cotton is provided in the inner cavity.

[0014] Preferably, the secondary filter chamber is a partially recessed structure located on the same side as the air inlet of the outer shell, with an inward curve and an outward opening; an air inlet slit communicating with the inner side of the outer shell is provided on the secondary filter chamber; a buckle plate is provided on the outer side of the secondary filter chamber, and a relatively closed chamber is formed with the outer shell through the buckle plate; a secondary filter sound insulation cotton attached to the buckle plate and a secondary filter cotton located inside the air inlet slit are provided in the chamber; an air outlet interface for connecting the air inlet pipe is provided at the filter outlet end of the secondary filter cotton.

[0015] Preferably, the intake muffler housing is divided into multiple cavities by partitions, and each cavity is filled with intake muffler cotton; the upper end of the partition is provided with a notch, and the notches of adjacent partitions are staggered, and the multiple cavities are connected by the staggered notches.

[0016] More preferably, a groove is provided on the top surface of each partition; a ridge corresponding to the groove is provided on the lower surface of the cover plate; after the intake muffler assembly is installed, the ridge is inserted into the groove; a sealing ring is also provided between the cover plate and the intake muffler housing.

[0017] Preferably, the exhaust silencing assembly includes an exhaust silencing housing, exhaust silencing cotton, an end plate, and an exhaust silencing inlet pipe; the exhaust silencing cotton is filled in the cavity of the exhaust silencing housing, and the exhaust silencing inlet pipe passes through the end plate and is inserted into the exhaust silencing cotton; the end plate is fixedly connected to the open end face of the exhaust silencing housing, and multiple air outlet holes are provided on the end plate.

[0018] More preferably, the exhaust silencing assembly further includes a guide plate; the guide plate is opposite to the exhaust port and is fixedly connected to the air compressor housing of the air compressor compartment; and a guide plate with silencing cotton is provided on the inner side of the guide plate.

[0019] More preferably, the exhaust muffler assembly further includes a lifting ring installed on the outside of the exhaust muffler housing; the upper part of the lifting ring is fixedly connected to the top surface of the air compressor housing.

[0020] Preferably, the fan nacelle is installed on the upper part of the air compressor nacelle, and the fan outlet in the fan nacelle is connected to the air compressor nacelle; the air compressor nacelle is connected to the base with an air outlet, and the low-temperature air blown by the fan passes through the air compressor nacelle and is discharged through the air outlet of the base, taking away the hot air in the air compressor nacelle.

[0021] More preferably, the molecular sieve tank assembly is installed on one side of the fan nacelle and air compressor nacelle assembly.

[0022] Preferably, the inner diameter of the section connecting the air guide pipe and the air inlet pipe is smaller than the inner diameter of the extension pipe section.

[0023] (III) Beneficial Effects

[0024] Compared with the prior art, the beneficial effects obtained by this utility model are as follows:

[0025] First, by installing sound-absorbing cotton inside the air compressor housing, sound-absorbing cotton between the outer shell and the air compressor housing, and sound-absorbing cotton at the air inlet and secondary filter compartment, the noise generated by the air compressor in the core internal parts of the oxygen generator is effectively isolated. Simultaneously, noise generated at the air inlet and secondary filter compartment is also isolated.

[0026] Second, by increasing the wall thickness of the intake pipe connecting the secondary filter chamber and the intake muffler housing, the resistance of the intake pipe to vibrations caused by airflow is enhanced, which helps reduce airflow noise in this area. Furthermore, by extending the air guide pipe, originally located on the intake muffler cover plate and only used to connect the intake pipe, into the intake muffler housing, it extends into the cavity of the intake muffler housing after installation, pressing against the intake muffler cotton. Since the inner diameter of this extended section is larger than that of the non-extended section, it helps reduce airflow velocity and weakens noise caused by high-speed air impact. Simultaneously, inside the intake muffler housing, multiple cavities connected by staggered notches for accommodating the intake muffler cotton are created, increasing the flow path length of the incoming air during the silencing process, thereby reducing intake noise.

[0027] Third, the end of the extension section inside the air duct of the cover plate is provided with a flange, and side holes are provided on the circumferential sidewall. The presence of side holes allows a portion of the incoming air to enter the cavity of the intake muffler housing through the side holes, effectively increasing the flow cross-section of the air entering the cavity of the intake muffler housing and further reducing the pressure inside the air duct. At the same time, the air flowing to the outside of the extension section mainly enters the intake muffler cotton through air static pressure, which helps to reduce noise generation. In addition, after long-term use, the outlet of the extension section end that directly presses against the intake muffler cotton is likely to be blocked due to the long-term accumulation of small solid particles. However, the circumferential side holes of the extension section, due to the gap between them and the intake muffler cotton, help to reduce blockage and ensure the air intake volume.

[0028] IV. Regarding exhaust, a single connecting pipe directly connects the negative pressure exhaust cylinder of the air compressor and the exhaust muffler assembly, reducing the length of the connecting pipe and thus helping to reduce noise generated by high-speed gas flow in the pipeline. The inlet and outlet ports of the exhaust muffler assembly are both located on its end plate. Nitrogen gas enters the exhaust muffler housing through the exhaust muffler inlet pipe at the center of the end plate, undergoes silencing treatment by the exhaust muffler cotton inside the housing, and is then deflected before being discharged through multiple small outlet ports on the end plate. During this process, the difficult-to-manage low-frequency noise generated by the VPSA compressor is converted into relatively easier-to-manage high-frequency noise, and the nitrogen gas flow rate is reduced after the deflection. Simultaneously, guide silencing cotton is also installed inside the guide plate opposite the outlet ports to further reduce the noise generated by the outflowing gas. Attached Figure Description

[0029] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments and descriptions of the utility model are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0030] Figure 1 The diagram schematically shows a front view of a preferred embodiment of the present invention, a quiet VPSA oxygen concentrator.

[0031] Figure 2 The diagram schematically shows a rear view of a quiet VPSA oxygen concentrator according to a preferred embodiment of the present invention.

[0032] Figure 3 for Figure 2 A sectional view along direction AA.

[0033] Figure 4 A perspective view of the rear half of the outer shell in a preferred embodiment of the present invention is shown schematically.

[0034] Figure 5 A perspective view of the air inlet cover of the quiet VPSA oxygen concentrator in a preferred embodiment of the present invention is shown schematically.

[0035] Figure 6 This is a partial enlarged view of the secondary filter chamber of the Qingyin VPSA oxygen concentrator in a preferred embodiment of this utility model.

[0036] Figure 7 This is a perspective view of a preferred embodiment of the present invention, showing the removal of the outer shell and the inner sound insulation cotton of the quiet VPSA oxygen concentrator.

[0037] Figure 8 This is a perspective view of the core internal components of the quiet VPSA oxygen generator in a preferred embodiment of the present invention (excluding the outer shell, inner sound insulation cotton, inner sound insulation cotton, part of the air compressor cover, and part of the fan cover, etc.).

[0038] Figure 9 An exploded view schematically showing the oxygen generator intake silencer assembly and intake pipe in a preferred embodiment of the present invention.

[0039] Figure 10 for Figure 9 A three-dimensional image.

[0040] Figure 11 An exploded view of an oxygen generator exhaust silencing assembly according to a preferred embodiment of the present invention is shown schematically.

[0041] The reference numerals used in the above figures are as follows:

[0042] 100, oxygen concentrator;

[0043] 1. Outer casing; 2. Base; 3. Casters; 4. Control console; 5. Power connector; 6. Fan compartment; 7. Air compressor; 8. Intake silencer assembly; 9. Exhaust silencer assembly; 10. Intake pipe; 11. Inner sound insulation cotton; 12. Inner sound insulation cotton; 13. Vibration damping mechanism; 14. Air compressor housing; 15. Secondary filter sound insulation cotton; 16. Secondary filter cotton; 17. Molecular sieve tank assembly;

[0044] 101, Air inlet; 102, Air inlet cover; 103, Buckle plate; 104, Air intake grille; 105, Primary filter sound insulation cotton; 106, Secondary filter chamber; 107, Power port; 108, Base mounting slot;

[0045] 201, Air vent;

[0046] 601, fan; 602, fan housing;

[0047] 801, cover plate; 802, air intake sound-absorbing cotton; 803, sealing ring; 804, air intake sound-absorbing housing; 805, air outlet connector;

[0048] 901, Exhaust muffler housing; 902, Exhaust muffler cotton; 903, End plate; 904, Exhaust muffler intake pipe; 905, Flow guide muffler cotton; 906, Flow guide plate; 907, Lifting ring;

[0049] 102-1, Side cavity; 102-2, Air inlet; 102-3, Inner cavity; 102-4, Extension section; 102-5, Clamping claw;

[0050] 106-1, air inlet slit; 106-2, air outlet slit;

[0051] 801-1, Plate body; 801-2, Air guide tube; 801-3, Side hole; 801-4, Flanged edge; 801-5, Raised ridge;

[0052] 804-1, cavity; 804-2, partition; 804-3, notch; 804-4, groove;

[0053] 903-1, Vent. Detailed Implementation

[0054] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered by the claims.

[0055] In the following description of this utility model, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer" and "vertical" 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 description and do not mean that the device or component needs to have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0056] In the following description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 direct connection or an indirect connection through an intermediate medium; or they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0057] Furthermore, in the following description of this utility model, unless otherwise stated, "multiple", "multiple groups", or "multiple roots" means two or more.

[0058] The air compressor, base, and other components used in the following embodiments are identical to those in existing patent CN119664627A, so their structures will not be described in detail. The control console used is a conventional product of existing VPSA oxygen generators, integrating common components such as circuit boards, displays, oxygen output interfaces, switches, knobs, and indicator lights. Similarly, the molecular sieve tank assembly is also a conventional product integrating two molecular sieve tanks, one oxygen collecting tank, upper and lower end caps, and multiple valves including control valves and check valves. The specific structures of these two components are not the focus of this utility model and will not be described in detail below.

[0059] Figure 1 A schematic front view of a quiet VPSA oxygen concentrator according to a preferred embodiment of the present invention is shown. From Figure 1 As can be seen, in this embodiment, the oxygen concentrator 100 includes a housing 1 and a base 2 mounted on the bottom of the housing 1. To facilitate movement of the oxygen concentrator, four (two shown) casters 3 are also installed on the bottom of the base 2. Simultaneously, to facilitate user operation of the oxygen concentrator, a control panel 4 is provided on the upper part of the front of the housing 1, and the control panel 4 includes a switch, an oxygen output interface, indicator lights, adjustment knobs, and other components. Additionally, a handle is provided on the upper part of the oxygen concentrator 100 for easy transport.

[0060] Figure 2 The diagram schematically shows a rear view of a quiet VPSA oxygen concentrator according to a preferred embodiment of the present invention. Figure 3 for Figure 2 A sectional view along direction AA. From Figure 2 As can be seen, in this embodiment, a rounded rectangular air inlet 101 is provided at the lower rear of the oxygen concentrator, and an air inlet cover 102 is connected to the inside of the air inlet 101 by a snap-fit. Similarly, on the upper left side of the air inlet 101, a snap-fit ​​plate 103 is provided, which is connected to the outer casing 1 by a snap-fit. The snap-fit ​​plate 103 is used to install related components of the secondary air filter. At the same time, a power connector 5 is provided on the lower left side of the air inlet 101 for connecting to an external power source.

[0061] from Figure 3 As can be seen, in this embodiment, the interior of the outer shell 1 is a large cavity, and the main structures within this cavity are the air compressor compartment where the air compressor 7 is located and the fan compartment 6 where the fan 601 is located. The air compressor compartment is located at the lower part and is fixedly connected to the base 2 via a shock-absorbing mechanism 13, while the fan compartment 6 is located at the upper part of the air compressor compartment. An intake silencer assembly 8 and an exhaust silencer assembly 9 are fixedly installed on the upper left and right sides of the air compressor compartment, respectively. Simultaneously, an inner sound insulation cotton 12 is provided inside the air compressor housing 14 of the air compressor compartment to isolate the noise generated during air compressor operation. Furthermore, an inner sound insulation cotton 11 is also provided in the gap between the air compressor housing 14 and the outer shell 1 to isolate the noise generated in this space and the noise transmitted from inside the air compressor housing 14.

[0062] At the air inlet 101, a primary filter and sound insulation cotton 105 is installed on the inner side of the air inlet cover 102 to isolate the intake noise generated at the air inlet 101. The innermost part of the air inlet 101 is the air intake grille 104. External air enters through the air inlet cover 102 inside the air inlet 101, passes through the air intake grille 104, and then enters the interior of the outer casing 1. Simultaneously, from... Figure 3 As can be seen, an air outlet 201 is provided in the middle of the base 2 to discharge the heat dissipation gas inside the oxygen generator.

[0063] Figure 4 A perspective view of the rear half of the outer casing in a preferred embodiment of the present invention is shown schematically. From Figure 4 As can be seen, in this embodiment, the outer shell 1 is mainly composed of two parts, front and back, which are fixedly connected by pre-designed bolt mounting holes to form the entire outer shell 1. Figure 2 The image shows the rear portion of the outer casing. At the lower center of the rear portion of the outer casing 1 is the air intake grille 104 of the air inlet 101. Above the air intake grille 104 is a secondary filter chamber 106 recessed inwards from the outer casing 1. An air intake slit 106-1 is provided on one side of the secondary filter chamber 106 to allow air entering the outer casing 1 from the air intake grille 104 to enter the secondary filter chamber 106. Simultaneously, an air outlet 106-2 is provided to facilitate the exhaust of gas from the secondary filter chamber 106. A power port 107 is provided below the secondary filter chamber 106 for easy installation of the power connector 5. A base mounting groove 108 is provided at the bottom of the outer casing 1 for easy connection to the base 2.

[0064] Figure 5 A perspective view of the air inlet cover of a quiet VPSA oxygen concentrator according to a preferred embodiment of the present invention is shown schematically. From Figure 5As can be seen, in this embodiment, the air inlet cover 102 is an integral structure with inwardly recessed rectangular side cavities 102-1 on both sides for filling with primary filter cotton for preliminary air filtration. Three rectangular air inlets 102-2 are provided inside the side cavities 102-1 to facilitate the entry of filtered air into the inner cavity 102-3. Primary filter sound insulation cotton (not shown) is provided in the inner cavity 102-3 to isolate noise at the air inlet 101. Simultaneously, to facilitate the fixing of the air inlet cover 102, extension portions 102-4 are provided on both sides, with two claws 102-5 on each side of the extension portions 102-4 for fixed connection with the air inlet 101.

[0065] Figure 6 This is a partially enlarged view of the secondary filter chamber of the quiet VPSA oxygen concentrator in a preferred embodiment of this utility model. Figure 6 As can be seen, in this embodiment, the innermost layer of the secondary filter chamber 106 is a secondary filter cotton 16, used for secondary filtration of the incoming air. Air entering the outer casing 1 from the air intake grille 104 enters the interior of the secondary filter chamber 106 through the air intake slit 106-1. Meanwhile, to ensure the relative enclosure of the secondary filter chamber 106, it is fixed and sealed on its outermost side by a snap-on plate 103. To reduce the transmission of noise generated here, a secondary filter sound insulation cotton 15 is also attached to the inner side of the snap-on plate 103.

[0066] Figure 7 This is a perspective view of a preferred embodiment of the quiet VPSA oxygen concentrator of this utility model, showing the outer shell and inner sound insulation cotton removed. Figure 7 As can be seen, in this embodiment, the molecular sieve tank assembly 17, one of the core components of the oxygen generator, is installed on the outside of the air compressor compartment and fan compartment 6 assembly. The bottom of the molecular sieve tank assembly 17 is connected to the air supply pipeline of the air compressor via a control valve connecting pipe. Above the secondary filter sound insulation cotton 15 is the air inlet pipe 10, which is connected to the air outlet interface 106-2 on the outer casing 1. To reduce noise generated by vibration of gas flowing in the air inlet pipe 10, a connecting pipe with a larger inner wall thickness can be selected, for example, a silicone tube with a wall thickness greater than 50% of the inner diameter. The air inlet pipe 10 enters the fan compartment 6 through the side through hole of the fan cover 602 of the fan compartment 6.

[0067] Figure 8 This is a perspective view of the core internal components of the quiet VPSA oxygen concentrator in a preferred embodiment of this utility model (excluding the outer shell, inner sound insulation cotton, inner cover sound insulation cotton, part of the air compressor cover, and part of the fan cover, etc.). Figure 8As can be seen, in this embodiment, after the intake pipe 10 penetrates into the fan compartment 6, it connects to the upper section of the air guide pipe 801-2 of the intake silencer assembly 8, which is fixed below the fan compartment 6 and inside the air compressor compartment, thereby introducing the air after secondary filtration into the intake silencer assembly 8. The intake silencer assembly 8 and the exhaust silencer assembly 9 are two cuboid structures, respectively installed on the top sides of the air compressor compartment. Between the two is the air outlet of the fan 601, which introduces cold air into the air compressor compartment and carries away the heat generated during the operation of the air compressor 7, along with gases such as nitrogen generated by the exhaust silencer assembly 9, through the air outlet 201 of the base 2.

[0068] Figure 9 An exploded view schematically showing the oxygen generator intake silencer assembly and intake pipe in a preferred embodiment of the present invention. Figure 10 for Figure 9 A three-dimensional image. From Figure 9 and Figure 10 As can be seen, in this embodiment, the intake muffler assembly 8 includes a cover plate 801, multiple intake muffler cottons 802, a sealing ring 803, and an intake muffler housing 804. The intake muffler housing 804 has three partitions 804-2, dividing its interior into four chambers 804-1, with the four intake muffler cottons 802 filling each chamber 804-1. Each partition 804-2 has a notch 804-3 at its upper part to allow communication between the different chambers 804-1. It should be noted that the notches 804-3 on the different partitions 804-2 are staggered to increase the path length of air passing through the intake muffler cottons 802. Each partition 804-2 has a groove 804-4 at its top for engaging with a corresponding protrusion 801-5 at the bottom of the cover plate 801. The cover plate 801 is sealed to the intake muffler housing 804 by a sealing ring 803 and is fixedly connected by six bolts. In addition, an exhaust connector 805 for connecting to a connecting pipeline is provided on one side of the bottom of the intake muffler housing 804.

[0069] It is worth noting that an air guide pipe 801-2 is provided at one end of the cover plate 801-1. This air guide pipe 801-2 is divided into upper and lower sections. The upper section is connected to the air inlet pipe 10, and the lower section is an extension pipe extending towards the air intake sound-absorbing cotton 802. The inner diameter of the upper section is smaller than that of the extension pipe. After air enters the extension pipe through the air inlet pipe 10 along the upper section, the air velocity decreases due to the increased volume, which helps to reduce noise. At the same time, a flange 801-4 is provided on the inlet end face of the extension pipe, and multiple side holes 801-3 are provided circumferentially on the extension pipe. In actual manufacturing, it has been found that the side holes 801-3 and the flange 801-4 are beneficial to noise reduction. This may be because the side holes 801-3 increase the cross-section of airflow and reduce the air pressure and velocity. Furthermore, the air entering the outer side of the extension pipe section, which is expanded by the flange 801-4, and the air in the gap between the air intake sound-absorbing cotton 802, experiences a further reduction in flow velocity, and largely enters the air intake sound-absorbing cotton 802 through air static pressure. In addition, the existence of the aforementioned gaps helps prevent the accumulation and blockage of solid microparticles during long-term use, ensuring the air supply.

[0070] Figure 11 An exploded view schematically illustrates an oxygen generator exhaust silencing assembly according to a preferred embodiment of the present invention. From Figure 11 As can be seen, in this embodiment, the exhaust silencing assembly 9 mainly consists of an exhaust silencing housing 901, exhaust silencing cotton 902, an end plate 903, an exhaust silencing inlet pipe 904, a guide plate 906, a guide silencing cotton 905, and multiple lifting rings 907. The exhaust silencing housing 901 is a cuboid structure with one open end, and the U-shaped exhaust silencing cotton 902 fills the cavity within the exhaust silencing housing 901. The end plate 903 is fixedly connected to the opening of the exhaust silencing housing 901, and the exhaust silencing inlet pipe 904 passes through the end plate 903 and inserts into the exhaust silencing cotton 902. To facilitate the discharge of gas entering the exhaust silencing housing 901, multiple air outlets 903-1 are provided on the end plate 903. The guide plate 906 is fixed to the air compressor housing 14 opposite to the air outlets 903-1. To reduce the noise generated by the outflowing air, a sound-absorbing cotton 905 is fixed inside the baffle 906 to further reduce exhaust noise. Two lifting rings 907 are installed on the outside of the exhaust silencer housing 901 and are fixedly connected to the top surface of the air compressor housing 14 via the top.

[0071] The gas flow process during operation of the aforementioned quiet VPSA oxygen concentrator 100 is as follows: After the oxygen concentrator is turned on, external air enters through the side of the air inlet cover 102 inside the air inlet 101, passes through the primary filter cotton, and then enters the interior of the outer casing 1 through the air inlet grille 104. After preliminary filtration, the air enters the interior of the secondary filter chamber 106 along the air inlet slot 106-1, passes through the secondary filter cotton 16, and then enters the air inlet pipe 10 through the air outlet 106-2, and then enters the air intake silencer assembly 8 along the air intake pipe 10. After being silenced by the air intake, the air flows out from the air outlet joint 805 of the air intake silencer assembly 8 and enters the interior of the air compressor 7 along the connecting pipe. After being compressed by the air compressor 7, the air enters the molecular sieve tank group 17 for oxygen separation. The separated gas then enters the exhaust silencer assembly 9 through the air compressor 7. After being silenced by the exhaust silencer assembly 9, the air is drawn into the base 2 by the cold air from the fan 601 and discharged to the outside of the oxygen generator 100 through the air outlet 201.

[0072] The aforementioned quiet VPSA oxygen concentrator effectively reduces noise during operation by incorporating multiple layers of sound insulation cotton and unique intake and exhaust noise reduction components. Measurements show that during normal operation, the noise level at a distance of one meter can be reduced to below 30 decibels, effectively minimizing the negative impact of noise on users and thus enhancing the user experience.

[0073] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A low-noise VPSA oxygen concentrator, comprising a housing, a base mounted at the bottom of the housing, a control console mounted at the top of the housing, and molecular sieve tanks, a fan compartment, an air compressor compartment, an intake silencer assembly, and an exhaust silencer assembly located inside the housing; wherein the intake silencer assembly and the exhaust silencer assembly are fixedly installed inside the air compressor compartment; characterized in that, The outer shell is provided with an air inlet and a secondary filter chamber; the outlet of the secondary filter chamber is connected to the air intake silencer assembly via an air intake pipe; the air intake silencer assembly is connected to the air compressor intake pipe in the air compressor compartment; the air compressor is connected to the molecular sieve tank group, supplying compressed air to the molecular sieve tank group, and is connected to the exhaust silencer assembly via an exhaust pipe; sound insulation cotton is provided inside the cover of the air compressor compartment; sound insulation cotton is provided between the outer shell and the cover of the air compressor compartment; the air intake silencer assembly includes a cover plate, an air intake silencer housing, and air intake silencer cotton; an air guide pipe is provided on the cover plate, one side of the air guide pipe is connected to the air intake pipe, and the other side extends into the air intake silencer housing and presses against the air intake silencer cotton located inside the air intake silencer housing; a flange is provided at the end of the section of the air guide pipe extending into the air intake silencer housing, and multiple side holes are provided around the circumference of the extended section.

2. The quiet VPSA oxygen concentrator according to claim 1, characterized in that, An air intake grille is provided on the inner side of the air intake of the outer shell, and a removable air intake cover is provided on the outer side of the air intake grille; the air intake cover is provided on both sides with inward side cavities, and a primary filter cotton is provided in the side cavities, and an air intake hole for air circulation is provided on the side cavities; an inner cavity is provided between the two air intake holes, and a primary filter sound insulation cotton is provided in the inner cavity.

3. The quiet VPSA oxygen concentrator according to claim 1, characterized in that, The secondary filter chamber is a partially recessed structure located on the same side as the air inlet of the outer shell, with an inward curve and an outward opening. An air inlet slit communicating with the inner side of the outer shell is provided on the secondary filter chamber. A buckle plate is provided on the outer side of the secondary filter chamber, forming a relatively closed chamber with the outer shell through the buckle plate. Secondary filter sound insulation cotton attached to the buckle plate and secondary filter cotton located inside the air inlet slit are provided in the chamber. An air outlet port for connecting the air inlet pipe is provided at the filter outlet end of the secondary filter cotton.

4. The quiet VPSA oxygen concentrator according to claim 1, characterized in that, The intake muffler housing is divided into multiple cavities by partitions, and each cavity is filled with intake muffler cotton; there is a notch at the upper end of the partition, and the notches of adjacent partitions are staggered, and the multiple cavities are connected by the staggered notches.

5. The quiet VPSA oxygen concentrator according to claim 4, characterized in that, A groove is provided on the top surface of each partition; a ridge corresponding to the groove is provided on the lower surface of the cover plate; after the intake muffler assembly is installed, the ridge is inserted into the groove; a sealing ring is also provided between the cover plate and the intake muffler housing.

6. The quiet VPSA oxygen concentrator according to claim 1, characterized in that, The exhaust silencing assembly includes an exhaust silencing shell, exhaust silencing cotton, an end plate, and an exhaust silencing inlet pipe; the exhaust silencing cotton is filled in the cavity of the exhaust silencing shell, and the exhaust silencing inlet pipe passes through the end plate and is inserted into the exhaust silencing cotton; the end plate is fixedly connected to the open end face of the exhaust silencing shell, and multiple air outlet holes are provided on the end plate.

7. The quiet VPSA oxygen concentrator according to claim 6, characterized in that, It also includes a guide plate; the guide plate is opposite to the air outlet and is fixedly connected to the air compressor housing of the air compressor compartment; the inner side of the guide plate is provided with air-guiding and sound-absorbing cotton.

8. The quiet VPSA oxygen concentrator according to claim 6, characterized in that, It also includes a lifting ring installed on the outside of the exhaust muffler housing; the upper part of the lifting ring is fixedly connected to the top surface of the air compressor housing.

9. The quiet VPSA oxygen concentrator according to claim 1, characterized in that, The fan nacelle is installed on the upper part of the air compressor nacelle, and the fan outlet in the fan nacelle is connected to the air compressor nacelle; the air compressor nacelle is connected to the base with an air outlet, and the low-temperature air blown by the fan passes through the air compressor nacelle and is discharged through the air outlet of the base, taking away the hot air in the air compressor nacelle.

10. The quiet VPSA oxygen concentrator according to claim 9, characterized in that, The molecular sieve tank assembly is installed on one side of the fan nacelle and air compressor nacelle assembly.

Images