Silencing and cooling assembly and shell structure for VPSA oxygen generator

Abstract

The invention discloses a silencing and cooling assembly for a VPSA oxygen generator and a shell structure, and belongs to the technical field of oxygen generators. The assembly comprises an exhaust silencing part, a fan and an air compressor housing. Wherein the exhaust silencing part is mounted in the air compressor housing and comprises a housing, silencing cotton I, an end plate, an air inlet pipe, silencing cotton II and a silencing guide plate. The silencing cotton I is installed in a cavity formed by the shell and the end plate, and the air inlet pipe is arranged on the end plate and introduces discharged nitrogen into the cavity. The end plate is provided with a plurality of air outlets, and the silencing cotton II is installed in the silencing guide plate, located on the outer side of the end plate and opposite to the air outlets. The silencing flow guide plate is fixedly connected with the side face of the air compressor housing, the inner side face provided with the silencing cotton II is a curved face, and nitrogen is guided to the position below an air outlet of a fan. The fan is fixedly installed on the upper portion of the air compressor housing, and an air outlet faces downwards. Meanwhile, the invention further provides a shell structure comprising the assembly. The assembly can effectively reduce the noise and temperature of the VPSA oxygen generator.

Description

Technical Field

[0001] The present invention belongs to the technical field of oxygen concentrators, and in particular relates to a silencing and cooling component for a VPSA oxygen concentrator, and a shell structure for a VPSA oxygen concentrator containing the silencing and cooling component. Background Art

[0002] At present, the molecular sieve oxygen generators used at home are mainly divided into two types: PSA oxygen generator and VPSA oxygen generator. Among them, the PSA oxygen generator mainly generates pressurized gas by the operation of the compressor, and transmits pressure to the two molecular sieve towers respectively through the gas control valve. The gas is filtered through the molecular sieve to produce oxygen with a concentration of more than 90%. When the double molecular sieve oxygen production unit is working, the gas control valve first opens the first molecular sieve gas circuit to pressurize the inside. After filtering the molecular sieve material and extracting oxygen with a concentration of more than 90%, the gas control valve inlet gas circuit is closed, and the gas control valve exhaust gas circuit is opened to discharge the filtered nitrogen. At the same time, the gas circuit of the second molecular sieve tower is opened to pressurize the inside. After filtering the molecular sieve material, oxygen with a concentration of more than 90% is extracted and the gas circuit is closed again to work in a cycle. The pressurized adsorption and normal pressure desorption method of the PSA oxygen generator has the following problems:

[0003] First, the noise is loud. When the oxygen generator is working, the compressor will produce a certain low-frequency noise when it inhales air. At the same time, after the molecular sieve tower is pressurized and purified, there is a large pressure inside the molecular sieve tower. When the nitrogen is discharged, the pressure is released instantly, and the vibration of other related parts caused by it will produce a large noise, which will bring a very bad experience to the user.

[0004] Second, the molecular sieve tower desorbs nitrogen at normal pressure when discharging it, and there is a problem of incomplete desorption of nitrogen in the molecular sieve, which will affect the gas production concentration and flow rate of the oxygen generator.

[0005] Third, the nitrogen after pressurization and purification in the molecular sieve tower has a relatively high temperature. At the same time, in order to eliminate noise, silencer cotton or sound insulation cotton will be added inside the oxygen generator casing, which will cause the high-temperature gas to be unable to be discharged in time, thus affecting the life of the compressor.

[0006] The VPSA oxygen generator uses pressurized adsorption and vacuum desorption to produce oxygen. The VPSA oxygen generator compressor adopts a four-cylinder structure, namely a positive pressure inlet cylinder, a positive pressure exhaust cylinder, a negative pressure inlet cylinder and a negative pressure exhaust cylinder. After entering and being filtered and silenced, the air is first compressed by the positive pressure inlet cylinder and then discharged into the air control valve by the positive pressure exhaust cylinder. After the air control valve sends the gas into the molecular sieve tower for adsorption, the remaining nitrogen is then discharged into the negative pressure inlet cylinder of the compressor through the air control valve for negative pressure desorption, and the final nitrogen is discharged through the negative pressure exhaust cylinder. This method changes the instantaneous nitrogen discharge of the PSA oxygen compressor to real-time nitrogen discharge, which is very beneficial to reducing the noise of the oxygen generator, and the nitrogen desorption is relatively thorough, which greatly reduces the impact on the working efficiency of the molecular sieve of the oxygen generator.

[0007] Although the noise of the oxygen concentrator can be controlled at around 50 decibels after the above improvements, it will still have a significant impact on users, making the noise and cooling problems of the oxygen concentrator a technical issue that needs to be continuously improved.

[0008] In addition to using compressors based on different principles, the most common method for silencing in the prior art is to use a can silencer equipped with silencer cotton. For example, the prior art CN 204999612 U discloses an oxygen concentrator silencer. The oxygen concentrator silencer adopts a double shell structure, namely, it includes shell A and shell B. The two shells are connected at the ends through a chassis, with an air inlet pipe inserted in the middle, and air outlet pipes on both sides, and a silencer layer is inserted into the shell. It has a simple structure and is easy to use and maintain. However, the silencer effect is limited when used alone, and it is impossible to further improve the silent effect of the oxygen concentrator.

[0009] For another example, the prior art CN 108217601 A discloses a silencer device for a household oxygen concentrator. The silencer device includes a housing and a compressor installed in the housing, and a fan is provided on one side of the compressor. At the same time, an air guide plate is provided around the compressor on the outside of the compressor, and an annular air guide portion is provided on the inner surface of the housing, so that the housing and the annular air guide portion form an annular air duct. This scheme forms an annular air duct by extending the air duct, which is convenient for setting up a silencer structure. At the same time, it is also generally believed in the prior art that extending the silencer circuit is beneficial to improving the silencer effect. The above scheme uses the method of extending the air duct to make the structure of the oxygen concentrator more complicated and increase the manufacturing cost. Summary of the invention

[0010] 1. Technical issues to be resolved

[0011] The present invention aims to further optimize the noise and temperature reduction problems of the existing VPSA oxygen concentrator, and at the same time, further simplify the structure and reduce the manufacturing cost.

[0012] (II) Technical solution

[0013] In order to solve the above technical problems, the present invention provides a silencing and cooling component for a VPSA oxygen concentrator, and the specific technical solutions adopted are as follows:

[0014] A silencing and cooling component for a VPSA oxygen concentrator, the component comprising an exhaust silencing component 4, a fan 5 and an air compressor housing 6;

[0015] The exhaust silencer 4 is installed inside the air compressor housing 6; it includes a housing 41, silencer cotton I42, an end plate 43, an air inlet pipe 44, silencer cotton II45, and a silencer guide plate 46; the silencer cotton I42 is installed in a cavity formed by the housing 41 and the end plate 43, and the air inlet pipe 44 is constructed on the end plate 43 to introduce the discharged nitrogen into the cavity; a plurality of air outlet holes 43-1 are provided on the end plate 43; the silencer cotton II45 is installed in the silencer guide plate 46, located on the outside of the end plate 43 and opposite to the air outlet holes 43-1; the silencer guide plate 46 is fixedly connected to the side of the air compressor housing 6, and the inner side surface on which the silencer cotton II45 is installed is a curved surface, which guides the nitrogen to the lower side of the air outlet of the fan 5;

[0016] The fan 5 is fixedly mounted on the upper part of the air compressor housing 6, with the air outlet facing downward to draw air into the air compressor housing 6 for cooling;

[0017] The air compressor cover 6 is arranged inside the oxygen concentrator housing and is used to protect the compressor.

[0018] Preferably, the exhaust silencer 4 further includes a hanging ring 47 made of elastic material; a plurality of hanging rings 47 are bundled with the outer side of the shell 41 and fixedly connected with the top plate 61 of the air compressor cover 6 .

[0019] Preferably, the silencing and cooling component also includes an exhaust pipe I 11; the air inlet end of the exhaust pipe I 11 is connected to the negative pressure exhaust cylinder outlet of the VPSA air compressor, and the air outlet end is connected to the air inlet pipe 44.

[0020] Preferably, the sound-absorbing cotton I42 is U-shaped sound-absorbing cotton.

[0021] Preferably, the silencing and cooling assembly further comprises an air intake silencer 3; the air intake silencer 3 is fixed to the bottom of the top plate 61 of the air compressor housing 6, and is connected to the positive pressure intake cylinder of the VPSA air compressor through a pipeline.

[0022] Another object of the present invention is to provide a shell structure containing the above-mentioned silencer and cooling component, which shell structure includes a base 2, a fan cover 7 and an oxygen generator shell in addition to the silencer and cooling component; the base 2 is fixedly connected to the oxygen generator shell to form an outer layer structure of the oxygen generator, and silencer cotton is laid on the inner surface of the oxygen generator shell; the fan cover 7 is fixed to the upper part of the top plate 61 of the air compressor cover 6; the bottom of the air compressor cover 6 is fixedly connected to the base 2, and sound insulation cotton is laid circumferentially on the inner surfaces of the air compressor cover 6 and the fan cover 7.

[0023] Preferably, the base 2 includes a support plate 21, a bottom plate 22 and a partition plate 23;

[0024] The support plate 21 is an integrated structure, and is provided with an annular protrusion 21-1. The outer side of the annular protrusion 21-1 is a flange 21-2 extending in four directions, and the inner side is a concave cavity I 21-4. An air inlet hole 21-3 is provided on the vertical surface where the protrusion 21-1 and the concave cavity I 21-4 are connected.

[0025] The bottom plate 22 is an integrated three-step structure, with the highest edge 23-1 along the circumferential direction, the platform 22-3 located inside the edge 23-1 in the middle, and the lowest cavity II 22-4; an air outlet 22-1 is provided on one side of the cavity II 22-4;

[0026] The partition 23 is installed in the concave cavity II 22-4, and a ventilation grille 23-2 is provided at one end; the air flowing down from the air outlet of the fan 5 enters the space between the concave cavity I 21-4 and the concave cavity II 22-4 through the air inlet 21-3, then enters the concave cavity II 22-4 through the holes of the grille 23-2, and is finally discharged through the air outlet 22-1.

[0027] Preferably, the partition 23 is a П-shaped structure, and a vertical surface is provided with a plurality of fixing ears 23-3 extending outward, and a through hole for connection is provided on the fixing ears 23-3.

[0028] More preferably, the cavity II 22 - 4 is provided with a connection hole whose position corresponds to the through hole of the fixing ear 23 - 3 ; the bottom plate 22 and the partition plate 23 are fixedly connected via the through hole and the connection hole.

[0029] Preferably, a plurality of through holes are provided on the flange 21 - 2 of the support plate 21 , and a plurality of connecting holes corresponding to the positions of the through holes on the flange 21 - 2 are provided on the inner side of the edge 22 - 2 of the bottom plate 22 , and the support plate 21 and the bottom plate 22 are fixedly connected via the through holes and the connecting holes.

[0030] (III) Beneficial effects

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] In terms of optimizing and improving the noise and cooling effect of the VPSA oxygen concentrator, the applicant did not adopt the traditional method of extending the air duct and adding a silencer circuit. On the contrary, it creatively adopted a short and smooth method to improve the noise and temperature rise of the oxygen concentrator. At the outlet of the negative pressure exhaust cylinder of the VPSA compressor, the exhaust silencer is directly connected through the exhaust pipe. The air inlet and outlet of the exhaust silencer are both located on its end plate. Nitrogen enters the exhaust silencer through the central air inlet along the air inlet pipe and returns before being discharged through multiple small outlets located on the end plate. In this process, the difficult-to-handle low-frequency noise generated by the VPSA compressor is converted into relatively easy-to-handle high-frequency noise, and the flow rate of the nitrogen that has been returned is reduced. After measurement, the noise of the air inlet silencer is 43 decibels one meter away from the oxygen concentrator without the use of silencer guide plates and silencer cotton. After the installation of silencer guide plates and silencer cotton, the noise of the oxygen concentrator is reduced to 39.5 decibels one meter away.

[0033] A silencer guide plate is provided on the outer side of the end plate of the exhaust silencer, directly opposite to the air outlet, and silencer cotton is provided inside the silencer guide plate, so that the nitrogen coming out of the air outlet is blown to the silencer cotton for secondary silencer, while changing the flow direction of the nitrogen. A fan is provided above the downstream position of the nitrogen flow direction, and the air outlet of the fan is downward. The cold air flowing out at high speed from the air outlet of the fan drives the high-temperature nitrogen flowing at a low speed after the turn to flow rapidly downward, and is quickly discharged from the base, thereby greatly shortening the residence time of the high-temperature nitrogen in the oxygen generator body, and effectively solving the problem of excessive temperature rise of the VPSA compressor caused by high-temperature nitrogen. Specifically, compared with the applicant's previous generation of oxygen generators designed by extending the air duct, the operating temperature of the compressor of the oxygen generator is reduced from 89°C to 80°C.

[0034] Compared with the applicant's previous generation design of extending the air outlet duct, the silencer and cooling structure of the present application only requires one exhaust pipe and can simplify the structure of the base so that there is no need to form a dedicated nitrogen exhaust circuit in the base, thereby reducing the number of parts, optimizing the overall structure, and helping to reduce manufacturing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0036] Figure 1 A front view of a noise-reducing and heat-dissipating core structure of an existing VPSA oxygen concentrator of the applicant is schematically shown.

[0037] Figure 2 for Figure 1 Color rendering of .

[0038] Figure 3The schematic diagram of the front view structure of the VPSA oxygen generator in a preferred embodiment of the present invention is shown after removing the outer shell and part of the inner shell and the sound-absorbing cotton.

[0039] Figure 4 for Figure 3 Color rendering of .

[0040] Figure 5 for Figure 4 Stereoscopic diagram.

[0041] Figure 6 It is a schematic diagram of the explosion structure of the exhaust silencer in a preferred embodiment of the present invention.

[0042] Figure 7 It is a schematic diagram of the three-dimensional structure of a support plate in a VPSA oxygen generator base assembly in a preferred embodiment of the present invention.

[0043] Figure 8 It is a schematic diagram of the three-dimensional structure of the partition in the base assembly of the VPSA oxygen generator in a preferred embodiment of the present invention.

[0044] Fig. 9 It is a schematic diagram of the three-dimensional structure of the bottom plate in the base assembly of the VPSA oxygen generator in a preferred embodiment of the present invention.

[0045] Reference numerals in the above drawings:

[0046] 1, air compressor; 2, base; 3, air intake silencer; 4, exhaust silencer; 5, fan; 6, air compressor cover; 7, fan cover; 8, oxygen production unit;

[0047] 11, exhaust pipe I; 12, exhaust pipe II;

[0048] 21, support plate; 22, bottom plate; 23, partition plate;

[0049] 41, shell; 42, silencer cotton I; 43, end plate; 44, air intake pipe; 45, silencer cotton II; 46, silencer guide plate; 47, lifting ring;

[0050] 61, top plate;

[0051] 21-1, protrusion; 21-2, flange; 21-3, air inlet; 21-4, cavity I;

[0052] 22-1, air outlet; 22-2, edge; 22-3, platform; 22-4, cavity II; 22-5, connection hole;

[0053] 23-1, plate body; 23-2, grille; 23-3, fixing ears;

[0054] 43-1, vent. DETAILED DESCRIPTION

[0055] The embodiments of the present invention are described in detail below with reference to the accompanying drawings, but the present invention can be implemented in many different embodiments as defined and covered by the claims.

[0056] In the following description of the present invention, it should be noted that terms such as "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "top", "bottom", "inside", "outside" and "vertical" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific direction, be constructed and operated in a specific direction, and therefore, should not be understood as limiting the present invention.

[0057] In the following description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0058] In addition, in the following description of the present invention, unless otherwise specified, “plurality”, “multiple groups”, and “multiple roots” mean two or more.

[0059] During the development of the previous generation of VPSA oxygen concentrators, the applicant designed and manufactured an oxygen concentrator core structure based on the idea of ​​extending the air duct to reduce temperature and noise. Figure 1 As shown, a rendering of the same structure is provided to facilitate the distinction of the components. Figure 2 As shown in the figure, the four-cylinder VPSA air compressor is installed on the base 2 through a shock-absorbing device, and the upper part is respectively installed with an intake silencer 3 and an exhaust silencer 4 on both sides through injection-molded connectors. Among them, the intake silencer 3 is connected to the air intake pipe ( Figure 2 The green one shown in the figure is connected to the positive pressure inlet cylinder, and the exhaust silencer 4 is connected to the positive pressure inlet cylinder through two exhaust pipes ( Figure 2The exhaust silencer 4 is connected to the negative pressure exhaust cylinder outlet of the VPSA air compressor through the exhaust pipe I 11. After the nitrogen dedicated channel inside the base 2 flows through, it enters the exhaust pipe II 12 from the outlet, and finally enters the exhaust silencer 4 on the upper part along the exhaust pipe II 12. As a result, the air duct length for the high-noise and high-temperature nitrogen is relatively long. At the same time, two layers of sound insulation cotton are set in the cover and the shell to effectively control the noise of the oxygen generator to about 45 decibels, and the stable working temperature of the air compressor is about 89°C.

[0060] Because the noise and temperature of the previous generation of VPSA oxygen concentrators still need to be further optimized, the applicant changed the idea and designed and manufactured another VPSA oxygen concentrator. Figure 3 , 4 The VPSA oxygen concentrator shown in 5 is equipped with the silencer and cooling assembly of the present invention. For the convenience of display, the oxygen concentrator housing (and the sound insulation cotton inside the housing), part of the air compressor housing 6 and part of the fan housing 7, as well as other connecting parts are omitted.

[0061] from Figure 3-5 It can be seen that in this preferred embodiment of the present invention, an air compressor housing 6 is installed on the base 2 of the VPSA oxygen generator, and a fan housing 7 is installed on the upper part of the air compressor housing 6. A fan 5 is installed inside the fan housing 7, and the air outlet of the fan 5 faces downward so as to convey cooling air to the lower air compressor housing 6 through the through hole on the fixing plate. A four-cylinder VPSA air compressor is installed in the air compressor housing 6, and the air intake pipe ( Figure 4 Green pipe), one end of which is connected to the air inlet silencer 3, and the other end is connected to the air inlet of the positive pressure inlet cylinder of the VPSA air compressor. The exhaust of the air compressor 1 only passes through one exhaust pipe, namely, the exhaust pipe I 11 ( Figure 4 Red pipe), connected to the exhaust silencer 4.

[0062] from Figure 5 It can be seen that the main body of the exhaust silencer 4 is fixedly installed at the lower part of the top plate 61 of the air compressor housing 6, and its main body is a shell 41 of a rectangular parallelepiped structure, and the end is an end plate 43. Opposite to the end plate 43 is a silencer guide plate 46, which is fixedly connected to the side wall (not shown) of the air compressor housing 6 by bolts. At the same time, it can be seen from the figure that the silencer guide plate 46 is close to the fan outlet and is located at its lower end.

[0063] Figure 6 FIG. 1 is a schematic diagram of the explosion structure of an exhaust muffler in a preferred embodiment of the present invention. Figure 6It can be seen that in this preferred embodiment, the exhaust silencer 4 is mainly composed of a rectangular shell 41 with an open end, a U-shaped silencer cotton I 42, an end plate 43, an air inlet pipe 44, a silencer cotton II 45, a silencer guide plate 46 and two elastic hanging rings 47. Among them, the U-shaped silencer cotton I 42 is inserted into the shell 41 and connected through the end plate 43. The air inlet pipe 44 is a curved pipe, one end of which is inserted into the U-shaped silencer cotton I 42 through the end plate 43, and the other end is connected to the exhaust pipe I 11. A plurality of air outlet holes 43-1 with a diameter much smaller than the diameter of the air inlet pipe 44 are provided on the end plate 43. The silencer cotton II 45 is opposite to the end plate 43 and is installed in the inner curved surface of the silencer guide plate 46, and the silencer guide plate 46 is fixedly connected to the side wall of the air compressor cover 6 by bolts.

[0064] In a preferred embodiment of the present invention, Figure 6 The exhaust silencer 4 shown, Figure 3 The air compressor housing 6 and the fan 5 shown in the figure can constitute the main structure of the silencer and cooling component. The high-noise and high-temperature nitrogen discharged from the air compressor 1 is discharged through the exhaust pipe I 11 and then enters the housing 41 through the air intake pipe 44. After being silenced and turned back in the silencer cotton I 42, it is discharged through the multiple air outlets 43-1 on the end plate 43. As a result, the low-frequency noise generated by the operation of the air compressor 1 is converted into relatively easy-to-handle high-frequency noise. After being silenced and decelerated and discharged, the nitrogen moves to the silencer cotton II 45 opposite to the end plate 43 for secondary noise reduction, and finally flows along the silencer guide plate 46 to the fan air inlet, and flows with the fast-circulating low-temperature air to the base 2 for discharge.

[0065] Based on the above-mentioned silencing and cooling components, the applicant designed and manufactured a matching double-layer shell structure of the VPSA oxygen concentrator. The structure is mainly composed of an oxygen concentrator casing, a base 2, a fan cover 7, a silencing and cooling component, and common connectors such as bolts, gaskets, and nuts. In order to ensure the silencing effect, at least one layer of sound insulation cotton is provided on the inner circumference of the oxygen concentrator casing, the air compressor cover 6, and the fan cover 7. The bottom of the oxygen concentrator casing is fixed to the base 2, and the specific shape can be determined according to actual requirements or conventionally selected. The base 2 is mainly composed of a support plate 21, a bottom plate 22, and a partition plate 23. In a preferred embodiment of the present invention, the base 2 can be made of Figure 7 The support plate 21 shown Figure 8 The partition 23 and Fig. 9 The bottom plate 22 is shown.

[0066] Figure 7 This is a schematic diagram of the three-dimensional structure of the support plate in the base assembly of the VPSA oxygen generator in a preferred embodiment of the present invention. Figure 7It can be seen that in this preferred embodiment, the support plate 21 is an integrated structure, with a protrusion 21-1 in the middle, a flange 21-2 extending outward from the outside of the protrusion 21-1, and a plurality of connecting through holes on the flange 21-2. A concave cavity I 21-4 is concave downward in the middle of the protrusion 21-1. Two air inlet holes 21-3 in different directions are provided at the connection between the protrusion 21-1 and the concave cavity I 21-4.

[0067] Figure 8 This is a schematic diagram of the three-dimensional structure of the partition in the base assembly of the VPSA oxygen generator in a preferred embodiment of the present invention. Figure 8 It can be seen that in this preferred embodiment, the partition 23 is a П-shaped structure as a whole, and a grille 23-2 is provided on one side of the plate body 23-1. At the same time, a fixing ear 23-3 is provided at each of the four corners of the two vertical surfaces, and a through hole for connection is provided on the fixing ear 23-3.

[0068] Fig. 9 This is a schematic diagram of the three-dimensional structure of the bottom plate in the base assembly of the VPSA oxygen generator in a preferred embodiment of the present invention. Fig. 9 It can be seen that in this preferred embodiment, the bottom plate 22 is a three-step integrated structure. The highest step is an annular edge 22-2, the inner side of the edge 22-2 is a second step platform 22-3, and the middle of the second step platform 22-3 is a concave third step cavity II 22-4. Four connecting holes 22-5 are provided on the cavity II 22-4, which are used to be connected and fixed in series with the connecting holes on the fixing ears of the partition 23 by means of bolts.

[0069] The working principle and process of the above-mentioned silencing and cooling components and shell structure are as follows:

[0070] When the high-noise and high-temperature nitrogen generated by the air compressor is discharged through the negative pressure exhaust cylinder, it enters the exhaust silencer through the exhaust pipe. After being silenced by the silencer cotton in the exhaust silencer, the nitrogen returns and is discharged through the numerous small air outlets on the end plate, and then encounters the silencer cotton on the silencer guide plate for secondary silencer. In this way, the intensity of the high-frequency noise that has been converted from low-frequency noise is further reduced. After being guided by the silencer guide plate, the nitrogen flows to the bottom of the fan air inlet and flows to the base with the high-speed air flow. At the base, it first enters the middle of the two concave cavities of the base through the air inlet hole, then passes through the grille on the partition and finally enters the bottom plate concave cavity with the air outlet, and is finally discharged from the oxygen generator body.

[0071] The entire flow process of nitrogen is Figure 1 and 2The previous generation structure shown is shorter and smoother. The noise of the VPSA oxygen generator with this structure can be reduced to 39.5 decibels (1 meter away from the oxygen generator), and the stable operating temperature of the air compressor is only 80°C. At the same time, the exhaust structure reduces one exhaust pipe and reduces the structural requirements for the base, which helps to reduce manufacturing costs.

[0072] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A silencing and cooling component for a VPSA oxygen concentrator, characterized in that: It comprises an exhaust silencer (4), a fan (5) and an air compressor housing (6); The exhaust silencer (4) is installed inside the air compressor housing (6); it comprises a housing (41), silencer cotton I (42), an end plate (43), an air inlet pipe (44), silencer cotton II (45), and a silencer guide plate (46); the silencer cotton I (42) is installed in a cavity formed by the housing (41) and the end plate (43); the air inlet pipe (44) is constructed on the end plate (43) to introduce the discharged nitrogen into the cavity; the end plate (43) is provided with a plurality of air outlet holes (43-1); the silencer cotton II (45) is installed in the silencer guide plate (46), located outside the end plate (43) and opposite to the air outlet holes (43-1); the silencer guide plate (46) is fixedly connected to the side of the air compressor housing (6); the inner side surface on which the silencer cotton II (45) is installed is a curved surface, and guides the nitrogen to the lower side of the air outlet of the fan (5); The fan (5) is fixedly mounted on the upper part of the air compressor housing (6), with the air outlet facing downward, so as to draw air into the air compressor housing (6) for cooling; The air compressor cover (6) is arranged inside the oxygen generator housing and is used to protect the compressor.

2. The silencing and cooling assembly for a VPSA oxygen concentrator according to claim 1, characterized in that: The exhaust silencer (4) further comprises a lifting ring (47) made of an elastic material; a plurality of lifting rings (47) are bundled with the outside of the shell (41) and fixedly connected to the top plate (61) of the air compressor cover (6).

3. The silencing and cooling assembly for a VPSA oxygen concentrator according to claim 1, characterized in that: It also includes an exhaust pipe I (11); the air inlet end of the exhaust pipe I (11) is connected to the negative pressure exhaust cylinder outlet of the VPSA air compressor, and the air outlet end is connected to the air inlet pipe (44).

4. The silencing and cooling assembly for a VPSA oxygen concentrator according to claim 1, characterized in that: The sound-absorbing cotton I (42) is a U-shaped sound-absorbing cotton.

5. The silencing and cooling assembly for a VPSA oxygen concentrator according to claim 1, characterized in that: It also includes an air intake silencer (3); the air intake silencer (3) is fixed to the bottom of the top plate (61) of the air compressor housing (6) and is connected to the positive pressure air intake cylinder of the VPSA air compressor through a pipeline.

6. A shell structure containing the silencing and cooling assembly according to any one of claims 1 to 5, characterized in that: It also comprises a base (2), a fan housing (7) and an oxygen concentrator housing; the base (2) is fixedly connected to the oxygen concentrator housing to form an outer structure of the oxygen concentrator, and the inner surface of the oxygen concentrator housing is paved with sound-absorbing cotton; the fan housing (7) is fixed to the upper part of the top plate (61) of the air compressor housing (6); the bottom of the air compressor housing (6) is fixedly connected to the base (2), and sound-absorbing cotton is paved along the circumferential direction on the inner surfaces of the air compressor housing (6) and the fan housing (7).

7. The housing structure according to claim 6, characterized in that: The base (2) comprises a supporting plate (21), a bottom plate (22) and a partition plate (23); The support plate (21) is an integrated structure and is provided with an annular protrusion (21-1). The outer side of the annular protrusion (21-1) is a flange (21-2) extending in four directions, and the inner side is a concave cavity I (21-4). An air inlet hole (21-3) is provided on the vertical surface where the protrusion (21-1) and the concave cavity I (21-4) are connected. The bottom plate (22) is an integrated three-step structure, with an edge (23-1) at the highest position along the circumferential direction, a platform (22-3) located inside the edge (23-1) in the middle, and a concave cavity II (22-4) at the lowest position; an air outlet (22-1) is provided on one side of the concave cavity II (22-4); The partition plate (23) is installed in the concave cavity II (22-4) and is provided with a ventilation grille (23-2) at one end; air flowing down from the air outlet of the fan (5) enters the space between the concave cavity I (21-4) and the concave cavity II (22-4) through the air inlet hole (21-3), then enters the concave cavity II (22-4) through the holes of the grille (23-2), and finally is discharged through the air outlet (22-1).

8. The housing structure according to claim 6, characterized in that: The partition plate (23) is a П-shaped structure, and a vertical surface is provided with a plurality of fixing ears (23-3) extending outward, and a through hole for connection is provided on the fixing ears (23-3).

9. The housing structure according to claim 8, characterized in that: The concave cavity II (22-4) is provided with a connection hole whose position corresponds to the through hole of the fixing ear (23-3); the bottom plate (22) and the partition plate (23) are fixedly connected via the through hole and the connection hole.

10. The housing structure according to claim 7, characterized in that: A plurality of through holes are provided on the flange (21-2) of the support plate (21), a plurality of connection holes corresponding to the positions of the through holes on the flange (21-2) are provided on the inner side of the edge (22-2) of the bottom plate (22), and the support plate (21) and the bottom plate (22) are fixedly connected via the through holes and the connection holes.

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