Heat dissipation air duct of oxygen generator and oxygen generator

Abstract

The heat dissipation air duct comprises a first air inlet, a second air inlet, a first air outlet, a second air outlet, a second air outlet, a heat dissipation device and a heat dissipation device, wherein the first air inlet is formed in a first side wall of a shell of the oxygen generator; the first air duct is connected with the first air inlet and located between the first side wall and a first side plate of the equipment cavity; a circuit board is arranged in the equipment cavity, and the circuit board is fixedly arranged on the first side plate; the first air inlet drains outside air to the first side plate. Heat dissipation gas entering the shell through the first air inlet is blown to the first side plate of the equipment cavity, heat transferred to the first side plate by the circuit board can be taken away, and cooling of the circuit board is achieved. By arranging the equipment cavity, heat generated by components in the equipment cavity is prevented from being quickly diffused to other areas in the oxygenerator shell, and normal work of other components is not affected; the space in the shell is divided into a plurality of interval spaces, the length of an air duct is increased, and the number of parts through which heat dissipation airflow flows is increased; and communication between the interval spaces and communication between the interval spaces and the outside are set, so that a bent and smooth air path is formed, and the heat dissipation efficiency of parts in the air channel is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of oxygen generators, and particularly relates to a heat dissipation air duct of an oxygen generator and an oxygen generator with the heat dissipation air duct. Background Art

[0002] An oxygen generator is a device that can extract oxygen from the air. It is mainly applied in the medical field to provide high-purity oxygen for patients in need of additional oxygen supply. Molecular sieve oxygen generators are currently commonly used, and two molecular sieves respectively perform the same cyclic process to achieve continuous gas supply. The working process is as follows: Raw air is pressurized by a compressor, and then the compressed air after treatment enters the molecular sieve through an intake valve. Nitrogen and the like are adsorbed in the molecular sieve, and the gas flowing out is high-purity oxygen.

[0003] When the compressor is used to compress a large amount of filtered air, the potential energy of the molecules in the compressed air is converted into kinetic energy, and the molecules move frequently and collide with each other to generate heat. If the generated heat cannot be discharged in time, it is likely to affect the service life of the oxygen generation equipment. Currently, a fan is set to dissipate heat for the compressor to ensure the working environment of the compressor; however, for other heat-generating components, which generate less heat than the compressor, heat dissipation treatment is generally not performed. For example, electrical components such as circuit boards will generate heat during operation, and the high temperature will seriously affect the service life of the electrical components.

[0004] In addition, currently, the frame structure design inside the housing is relatively complex, and the air duct design is not reasonable enough. Its sound insulation and noise reduction effects are poor, and the noise generated during operation is very large and there is also a high temperature rise, which seriously affects the use performance of the product.

[0005] The above information disclosed in this background art is only used to increase the understanding of the background art of this application. Therefore, it may include prior art that is not known to those of ordinary skill in the art. Summary of the Invention

[0006] The utility model aims at the above problems in the prior art and provides a heat dissipation air duct of an oxygen generator. The heat dissipation gas entering the housing through the first air inlet blows onto the first side plate of the equipment cavity, and can take away the heat transferred from the circuit board to the first side plate, thereby realizing the cooling of the circuit board.

[0007] To achieve the above utility model purpose, the utility model adopts the following technical solutions:

[0008] A heat dissipation air duct of an oxygen generator, comprising:

[0009] A first air inlet, which is opened on the first side wall of the oxygen generator housing;

[0010] a first air duct connected to the first air inlet and located between the first side wall and the first side plate of the equipment cavity;

[0011] A circuit board capable of generating heat is arranged in the equipment cavity, and the circuit board is fixed on the first side plate; the first air inlet guides external air to the first side plate.

[0012] In some embodiments of the present application, the equipment cavity has a second side panel arranged opposite to the first side panel; the heat dissipation duct also includes: a second air inlet penetrating the second side panel, which is used to introduce the heat dissipation airflow into the equipment cavity.

[0013] In some embodiments of the present application, the device cavity is spaced apart from the side wall of the shell, and the heat dissipation air duct also has a second air duct connecting the first air duct and the second air inlet, and the second air duct is located between the device cavity and the side wall of the shell.

[0014] In some embodiments of the present application, the projection of the first side panel on the first side wall covers the first air inlet; the equipment cavity also has a top plate and two third side panels connected between the first side panel and the second side panel; the second air duct has three branch air ducts located above the top plate of the equipment cavity and on the outside of the two third side panels.

[0015] In some embodiments of the present application, the projection of the first side panel on the first side wall is spaced apart from or partially overlaps with the first air inlet, and the first air inlet is inclined in an inward direction toward the first side panel.

[0016] In some embodiments of the present application, the equipment cavity also has a top plate and two third side plates connected between the first side plate and the second side plate; the second air duct is located on the outside of the third side plate in the inclination direction of the first air inlet.

[0017] In some embodiments of the present application, a fixing frame for fixing the circuit board is provided on the first side panel, the fixing frame has a supporting portion extending inward along the first side panel, and a fixing portion extending along the inner end of the supporting portion, and the circuit board is fixed on the fixing portion.

[0018] In some embodiments of the present application, a heat dissipation pipe connected to the compressor and used to transport compressed gas is provided in the equipment cavity, and the heat dissipation pipe is provided on the inner side of the second air inlet.

[0019] In some embodiments of the present application, the equipment cavity and the compressor cavity are arranged adjacent to each other vertically, and a third air inlet for supplying air from the equipment cavity to the compressor cavity is opened on the top of the equipment cavity, and the fan is fixed at the third air inlet.

[0020] In some embodiments of the present application, a first fan and a second fan for providing power to the air flow in the heat dissipation air duct are provided in the device cavity. The air inlet of the first fan faces the second air inlet; the second fan is vertically arranged with respect to the first fan, and the air inlet of the second fan is on the side close to the first fan.

[0021] In some embodiments of the present application, a silencing module is further included under the compressor cavity, and a fourth air inlet for delivering the air flow in the compressor cavity to the silencing module is provided on the bottom plate of the compressor cavity.

[0022] In some embodiments of the present application, an air outlet cavity extending downward is provided on the bottom shell of the outer shell, and an air outlet for discharging gas is provided on the side wall of the air outlet cavity.

[0023] In some embodiments of the present application, the projection of the first side plate on the first side wall covers the first air inlet; the first air inlet has a first air hole vertically arranged with respect to the first side plate for guiding the outside air to blow vertically onto the first side plate.

[0024] In some embodiments of the present application, the device cavity further has a top plate, and the first air inlet has a second air hole inclined towards the top plate for guiding the outside air to enter the first air duct inward and upward obliquely.

[0025] In some embodiments of the present application, the device cavity further has two third side plates connected between the first side plate and the second side plate; the first air inlet has at least a third air hole inclined towards one of the third side plates for guiding the outside air to enter the first air duct obliquely towards at least one third side plate in the inward direction.

[0026] Based on the above heat dissipation air duct, the present application further provides an oxygen generator having the above heat dissipation air duct. The heat dissipation gas entering the outer shell through the first air inlet blows onto the first side plate of the device cavity, and can take away the heat transferred by the circuit board to the first side plate, realizing the cooling of the circuit board.

[0027] An oxygen generator having the above heat dissipation air duct.

[0028] Compared with the prior art, the advantages and positive effects of the present utility model are as follows: The heat dissipation gas entering the housing through the first air inlet blows onto the first side plate of the equipment cavity, which can take away the heat transferred by the circuit board to the first side plate, thus achieving the cooling of the circuit board. By providing the equipment cavity, it is possible to prevent the heat generated by the internal components of the equipment cavity from quickly spreading to other areas within the oxygen generator housing, which may affect the normal operation of other components; and it is beneficial to divide the space within the housing into multiple spaced spaces, which is conducive to increasing the length of the air duct and the number of components through which the heat dissipation air flow passes; and by providing the connection between the spaced spaces and the connection to the outside, a bent and smooth air path is formed, which increases the heat dissipation efficiency of the components within the air duct.

[0029] After reading the specific embodiments of the present utility model in conjunction with the accompanying drawings, the other features and advantages of the present utility model will become clearer. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0031] Figure 1 FIG. is a schematic structural diagram of an embodiment of a heat dissipation air duct of an oxygen generator proposed by the present utility model;

[0032] Figure 2 is Figure 1 a vertical sectional view at the first air inlet;

[0033] Figure 3 is Figure 1 a horizontal sectional view at the first air inlet;

[0034] Figure 4 is Figure 3 an enlarged structural diagram at the first air inlet in;

[0035] Figure 5 is Figure 1 a left - right direction sectional view after removing the housing;

[0036] Figure 6 is Figure 1 a front - back direction sectional view after removing the housing;

[0037] Figure 7 is Figure 6 an enlarged structural diagram of area A in;

[0038] Wherein, the oxygen generator 100;

[0039] Housing 10; first side wall 11; second side wall 12; top wall 13; air outlet cavity 14; air outlet 141; air inlet groove 15; first air inlet 155;

[0040] Equipment cavity 20; first side plate 21; second air inlet 221; fixing bracket 211; supporting part 2111; fixing part 2112; second side plate 22; top plate 23; third side plate 24; fan 25; circuit board 27;

[0041] Compressor cavity 30; cavity top 33; third air inlet 331; fourth air inlet 341; compressor 35; heat dissipation pipe 351;

[0042] Heat dissipation air duct 40; first air duct 41; second air duct 42;

[0043] Sound absorption module 50. Detailed implementation manner

[0044] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model.

[0045] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. is based on the positional relationship shown in the accompanying drawings, with the direction close to the center of the oxygen generator being "inner" and the opposite being "outer". The terms are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation on the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance; the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "a plurality" means two or more unless otherwise specifically defined.

[0046] In the present utility model, unless otherwise clearly defined and limited, the terms "installed", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0047] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include direct contact between the first and second features, or may include the first and second features not being in direct contact but being in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "beneath" and "underneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is lower than that of the second feature.

[0048] The following disclosure provides many different embodiments or examples for implementing different structures of the present utility model. To simplify the disclosure of the present utility model, components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the present utility model. In addition, the present utility model may repeat reference numerals and / or reference letters in different examples. Such repetition is for the purpose of simplification and clarity and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present utility model provides examples of various specific processes and materials, but those of ordinary skill in the art may be aware of the application of other processes and / or the use of other materials.

[0049] See Figures 1-7 , which is an embodiment of a heat dissipation air duct of an oxygen generator proposed by the present utility model. The oxygen generator 100 has a housing 10, a device chamber 20 and a compressor chamber 30 arranged inside the housing 10. The device chamber 20 is located above the compressor chamber 30. By arranging the device chamber 20 and the compressor chamber 30, it is possible to prevent the heat generated by the components inside the compressor chamber 30 and the device chamber 20 from quickly spreading to other areas inside the housing of the oxygen generator and affecting the normal operation of other components. The housing 10 is a square shell and has four side walls. The compressor chamber 30 and the device chamber 20 are also square shells, and both the compressor chamber 30 and the device chamber 20 are arranged at intervals from the side walls of the housing 10. The first side wall 11 and the second side wall 12 on the housing 10 are parallel and oppositely arranged. The device chamber 20 is provided with a first side plate 21 adjacent to the first side wall 11 and a second side plate 22 adjacent to the second side wall 12.

[0050] In this embodiment, see Figure 2 and Figure 3As shown, a heat dissipation air duct 40 of an oxygen generator 100 includes: a first air duct 41 and a first air inlet 155. The first air inlet 155 is opened on the first side wall 11 of the housing 10. The first air duct 41 is located between the first side wall 11 and the first side plate 21 of the equipment chamber 20, and the first air duct 41 is connected to the first air inlet 155. A circuit board 27 that can generate heat is provided in the equipment chamber 20. The circuit board 27 is fixedly provided on the first side plate 21, and the first air inlet 155 diverts outside air to the first side plate 21. The heat generated by the circuit board 27 is transferred to the first side plate 21. The heat dissipation gas entering the housing 10 through the first air inlet 155 blows onto the first side plate 21 of the equipment chamber 20, and can take away the heat transferred from the circuit board 27 to the first side plate 21, realizing the cooling of the circuit board 27. By providing the equipment chamber 20, it is possible to prevent the heat generated by the internal components of the equipment chamber 20 from quickly spreading to other areas within the oxygen generator housing 10, which may affect the normal operation of other components; and it is beneficial to divide the space within the housing 10 into multiple spaced spaces, which is conducive to increasing the air duct length and the number of components through which the heat dissipation air flow passes; and by setting the connection between the spaced spaces and the connection to the outside, a bent and smooth air path is formed, increasing the heat dissipation efficiency of the components inside the air duct.

[0051] In some embodiments of the present application, refer to Figure 4 As shown, the first air inlet 155 is opened at the bottom of the air inlet groove 15. A filter element can be provided in the air inlet groove 15 for filtering the gas entering the housing 10. A cover plate can also be provided at the open end of the air inlet groove 15 to block the first air inlet 155, so that the first air inlet 155 cannot be seen from the appearance surface, forming a hidden air inlet structure, which is beneficial to improving the appearance quality. And the outside air needs to pass through the filter element to reach the first air inlet 155, avoiding dust in the outside air from falling on the first air inlet 155 and improving the quality of the inlet air flow.

[0052] In some embodiments of the present application, refer to Figure 6 and Figure 7 As shown, the circuit board 27 is a middle circuit board, and the circuit board generates heat during operation. The circuit board 27 is parallel to and spaced from the first side plate 21. First, it can increase the damping effect and prevent the vibration of the first side plate 21 from being directly transmitted to the circuit board 27; second, the distance between the circuit board 27 and the first side plate 21 is small, and the heat generated by the circuit board 27 can be transferred to the first side plate 21, and the first side plate 21 serves as a radiator for the circuit board 27.

[0053] In some embodiments of the present application, a fixing bracket 211 for fixing the circuit board 27 is provided on the first side plate 21. The fixing bracket 211 has a supporting portion 2111 extending inward along the first side plate 21 and a fixing portion 2112 bent and extending from the inner end of the supporting portion 2111. The circuit board 27 is fixed on the fixing portion 2112. By providing the fixing bracket 211, the fixing of the circuit board 27 and the spaced arrangement from the first side plate 21 can be achieved. The circuit board 27 is fixed on the fixing portion 2112 by fasteners. The circuit board 27 is vertically arranged, and a plurality of fixing brackets 211 are provided on the first side plate 21.

[0054] In some embodiments of the present application, a second air inlet 221 is formed in the second side plate 22 of the equipment chamber 20. The air flow in the second air duct 42 enters the equipment chamber 20 through the second air inlet 221, then enters the fan 25, and then blows towards the compressor 35. It is set that the plane where the top plate 23 of the equipment chamber 20 is located is higher than the first air inlet 155, and the first side plate 21 faces the first air inlet 155, so that the air flow entering from the first air inlet 155 blows onto the first side plate 21 to take away the heat transferred from the circuit board 27 to the first side plate 21. A second air inlet 221 is formed in the second side plate 22. The heat dissipation air duct 40 further has a second air duct 42 connecting the first air duct 41 and the second air inlet 221, and the air flow in the second air duct 42 is sucked into the equipment chamber 20 through the second air inlet 221.

[0055] In some embodiments of the present application, there is a spaced arrangement between the equipment chamber 20 and the side wall of the housing 10, and the second air duct 20 is located between the equipment chamber 20 and the side wall of the housing 10. The air flow entering from the first air inlet 155 blows onto the first side plate 21, and then the air flow bends in the first air duct 41; then it bends again and reaches the second air duct 42. The equipment chamber 20 further has a top plate 23 and two third side plates 24 connected between the first side plate 21 and the second side plate 22.

[0056] In some embodiments of the present application, the first side wall 11 is arranged parallel to the first side plate 21. For the positional relationship between the first air inlet 155 and the first side plate 21, there can be various types:

[0057] The first positional relationship is that the projection of the first side plate 21 on the first side wall 11 covers the first air inlet 155, that is, the first air inlet 155 and the first side plate 21 are arranged opposite to each other; the outside air entering from the first air inlet 155 can blow vertically onto the first side plate 21. At this time, the first air inlet 155 can be provided with a first air hole vertically arranged with the first side plate 21 for guiding the outside air to blow vertically onto the first side plate 21. In the case of only setting the first air hole: the outside air enters the first air duct 41 through the first air inlet 155, blows vertically onto the first side plate 21, and then the air flow turns upward and to the left and right respectively, enters the three branch air ducts, and then turns again to reach the second air inlet 221. The second air duct 42 has three branch air ducts located above the top plate 23 of the equipment cavity 20 and outside the two third side plates 24.

[0058] In some other embodiments, the first air inlet 155 can also be provided with a second air hole inclined toward the top plate 13 for guiding the outside air to enter the first air duct 41 inwardly and upwardly. The outside air enters the first air duct 41 through the first air inlet 155 and blows upwardly and obliquely onto the first side plate 21; then it enters the second air duct 42 located above the top plate 23.

[0059] In some other embodiments, the first air inlet 155 has a third air hole inclined at least toward one of the third side plates 24 for guiding the outside air to enter the first air duct 41 inwardly and at least obliquely toward one of the third side plates 24. The outside air enters the first air duct 41 through the first air inlet 155 and blows obliquely onto the first side plate 21 in the direction of one of the third side plates 24; then it enters the second air duct 42 outside the third side plate 24.

[0060] In some other embodiments, the first air inlet 155 has two kinds of third air holes respectively inclined toward the two third side plates 24 for guiding the outside air to enter the first air duct 41 inwardly and obliquely toward the two third side plates 24 respectively. The outside air enters the first air duct 41 through the first air inlet 155 and blows obliquely onto the first side plate 21 in the directions of the two third side plates 24 respectively; then it enters the branch air ducts of the second air duct 42 outside the two third side plates 24 respectively.

[0061] The second positional relationship is that the projection of the first side plate 21 on the first side wall 11 is spaced apart from or partially overlaps with the first air inlet 155, such as Figure 3As shown, that is, the first air inlet 155 and the first side plate 21 are offset. In order to blow the outside air entering from the first air inlet 155 onto the first side plate 21, the structure of the first air inlet 155 needs to be set. The first air inlet 155 is inclined in the inward direction towards the first side plate 21, and is used to blow the cooling air flow entering from the first air inlet 155 onto the first side plate 21 obliquely. The second air duct 42 is located outside the third side plate 24 of the equipment cavity in the inclined direction of the first air inlet 155.

[0062] In some embodiments of the present application, a heat dissipation pipe 351 connected to the compressor 35 is provided in the equipment cavity 20. The heat dissipation pipe 351 is used to transport compressed gas. The heat dissipation pipe 351 is arranged in an S-shaped structure for easy heat dissipation, and the heat dissipation pipe 351 is arranged inside the second air inlet 221. The air flow in the heat dissipation air duct 40 enters the equipment cavity 20 through the second air inlet 221, and at this time flows through the heat dissipation pipe 351 to achieve heat dissipation of the heat dissipation pipe 351.

[0063] In some embodiments of the present application, the equipment cavity 20 and the compressor cavity 30 are arranged adjacent to each other up and down. The bottom plate of the equipment cavity 20 also serves as the cavity top of the compressor cavity 30. A third air inlet 331 for sending air to the compressor cavity 30 is opened on the cavity top 33, and the fan 25 is fixed at the third air inlet 331. The fan 25 blows the cooling air flow downward into the compressor cavity 30 through the third air inlet 331.

[0064] In some embodiments of the present application, the oxygen generator 100 further includes a silencing module 50 located below the compressor cavity 30. A fourth air inlet 341 for transporting the air flow in the compressor cavity 30 to the silencing module 50 is opened on the bottom plate of the compressor cavity 30. An air outlet cavity 14 extending downward is provided on the bottom wall of the outer shell 10, and an air outlet 141 for discharging gas is opened on the side wall of the air outlet cavity 14. By providing the silencing module 50, it is used to silence when the gas is discharged to avoid excessive noise; by providing the air outlet cavity 14, it is avoided that the gas is directly discharged downward from the oxygen generator 100 and is discharged from the air outlet 141 on the side wall. One is that it can increase the length and bend of the air outlet path to further achieve a silencing effect, and the other is that it is avoided that the gas is directly discharged downward and impacts the ground, affecting the subsequent discharge of the gas.

[0065] In this embodiment, the first side wall 11 is the rear wall of the housing 10, that is, the first air inlet 155 is opened on the rear wall of the housing 10. After the fan 25 is started, the gas in the equipment cavity 20 is first sucked into the fan 25, causing a negative pressure in the equipment cavity 20; the gas outside the equipment cavity 20 is supplemented into the equipment cavity 20 through the second air inlet 221 of the second side plate 22, that is, the gas in the second air duct 42 is sucked into the equipment cavity 20, causing a negative pressure in the second air duct 42; the gas in the first air duct 41 is supplemented into the second air duct 42, and then the outside air enters the first air duct 41 through the first air inlet 155 on the first side wall 11 of the housing 10. That is, the outside gas enters the first air duct 41 through the first air inlet 155, and the cooling air flow flows through the first side plate 21, taking away part of the heat dissipated by the circuit board 27, and then the cooling air flow bends and flows in the first air duct 41; then it bends and enters the second air duct 42 and enters the equipment cavity 20 through the second air inlet 221. The cooling air flow flows through the heat dissipation pipe 351, and part of the cooling air flow flows through the circuit board 27; then it enters the fan 25 and is blown downward into the compressor cavity 30 to dissipate heat from the compressor 35; then it passes downward through the third air inlet 331 into the sound insulation module 50 for sound insulation treatment; finally, it reaches the air outlet cavity 14 and is discharged through the air outlet 141.

[0066] In this embodiment, a fan 25 for providing power to the air flow in the cooling air duct is provided in the equipment cavity 20. The fan 25 has a first fan and a second fan. The air inlet of the first fan is arranged facing the second air inlet 221; the second fan is arranged perpendicular to the first fan, and the air inlet of the second fan is on the side close to the first fan.

[0067] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, for those of ordinary skill in the art, it is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions required to be protected by the present invention.

Claims

1. A heat dissipation air duct of an oxygen generator, characterized in that Comprising: A first air inlet, which is opened on the first side wall of the oxygen generator housing; A first air duct, which is connected to the first air inlet and is located between the first side wall and the first side plate of the equipment cavity; A circuit board is provided in the equipment cavity, and the circuit board is fixedly arranged on the first side plate; the first air inlet guides external air to the first side plate.

2. The heat dissipation air duct according to claim 1, characterized in that, The equipment cavity has a second side plate opposite to the first side plate; the heat dissipation air duct further includes: a second air inlet penetrating through the second side plate, which is used to introduce heat dissipation air flow into the equipment cavity.

3. The heat dissipation air duct according to claim 2, characterized in that, There is a gap between the equipment cavity and the side wall of the housing, and the heat dissipation air duct further has a second air duct connecting the first air duct and the second air inlet, and the second air duct is located between the equipment cavity and the side wall of the housing.

4. The heat dissipation air duct according to claim 2, wherein The projection of the first side plate on the first side wall covers the first air inlet; the first air inlet has a first air hole perpendicular to the first side plate, which is used to guide external air to blow vertically onto the first side plate.

5. The heat dissipation air duct according to claim 4, characterized in that The equipment cavity further has a top plate, and the first air inlet has a second air hole inclined towards the top plate direction, which is used to guide external air to enter the first air duct inward and upward obliquely.

6. The heat dissipation air duct according to claim 4, wherein, The equipment cavity further has two third side plates connected between the first side plate and the second side plate; the first air inlet has at least a third air hole inclined towards one of the third side plates, which is used to guide external air to enter the first air duct obliquely towards at least one third side plate in the inward direction.

7. The heat dissipation air duct according to claim 3, characterized in that, The projection of the first side plate on the first side wall is spaced apart from or partially overlaps with the first air inlet, and the first air inlet is inclined in the inward direction towards the first side plate.

8. The heat dissipation air duct according to claim 7, wherein, The equipment cavity further has a top plate and two third side plates connected between the first side plate and the second side plate; the second air duct is located outside the third side plate in the inclined direction of the first air inlet.

9. The heat dissipation air duct according to any one of claims 2 to 8, characterized in that, A first fan and a second fan for providing power to the air flow in the heat dissipation air duct are provided in the equipment cavity, and the air inlet of the first fan faces the second air inlet; the second fan is perpendicular to the first fan, and the air inlet of the second fan is on the side close to the first fan.

10. An oxygen generator, characterized in that, Having the heat dissipation air duct according to any one of claims 1 to 9.

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