Exhaust silencer and oxygen production equipment

Abstract

The utility model provides an exhaust silencer and oxygen generating equipment, the exhaust silencer comprises a cover body, a bottom shell and an exhaust hood, the top of the cover body forms an air inlet, the bottom shell forms a sunken groove, one end of the groove forms an air outlet, the exhaust hood is arranged in the groove, one end of the exhaust hood extends to the air outlet, and the other end of the exhaust hood forms a hollow hole. The cover body is connected to the bottom shell and covers the groove, a first silencing cavity communicated with the air inlet is formed between the outer side of the exhaust hood and the cover body, and a second silencing cavity communicated with the air outlet is formed between the inner side of the exhaust hood and the bottom shell; the exhaust hood prolongs the path of air flow, changes the direction of the air flow, consumes energy of sound and can reduce noise of the air flow, and the exhaust silencer is simple in overall structure, convenient to disassemble and assemble and low in cost.

Description

Technical Field

[0001] The utility model relates to the technical field of exhaust silencing, in particular to an exhaust silencing device; the utility model also relates to oxygen production equipment comprising the exhaust silencing device. Background Art

[0002] Oxygen production equipment uses a compressor to generate high-pressure air, and then transports the high-pressure air to an adsorption tower equipped with a molecular sieve, and then uses the pressure swing adsorption principle of the molecular sieve to produce high-concentration oxygen.

[0003] When oxygen concentrators are operating, the compressor generates noise and a significant amount of heat. The equipment is typically equipped with noise reduction structures and cooling ducts. However, the cooling vents of oxygen concentrators are located close to the compressor, and the exhaust air can carry internal noise. Oxygen concentrators are often used by people in poor health who require a quiet environment. This noise can significantly impact the user experience.

[0004] Therefore, there is an urgent need for a solution to the noise problem of existing oxygen production equipment. Summary of the Invention

[0005] The purpose of the utility model is to provide an exhaust silencer and an oxygen production device to solve the above-mentioned technical problems in the prior art.

[0006] According to a first aspect of the present invention, there is provided an exhaust silencing device, comprising:

[0007] a cover body, the top of which forms an air inlet;

[0008] A bottom shell, which forms a sunken groove, one end of which forms an air outlet;

[0009] an exhaust hood, which is arranged in the groove, with one end extending to the air outlet and the other end forming a hollow hole;

[0010] Wherein, the cover body is connected to the bottom shell and covers the groove, a first silencer cavity connected to the air inlet is formed between the outer side of the exhaust hood and the cover body, and a second silencer cavity connected to the air outlet is formed between the inner side of the exhaust hood and the bottom shell.

[0011] In one embodiment of the present invention, the air inlet includes a first air inlet and a second air inlet respectively close to the opposite ends of the cover body, the first air inlet is close to the air outlet of the bottom shell, and the second air inlet is close to the hollow hole of the exhaust hood.

[0012] In one embodiment of the present invention, the opening area of ​​the first air inlet is larger than the opening area of ​​the second air inlet.

[0013] In one embodiment of the present invention, the hollow holes are distributed on the top surface and side surfaces of the exhaust hood, a gap is formed between the side surfaces of the exhaust hood and the side walls of the groove, and the gap is connected to the first silencing cavity.

[0014] In one embodiment of the present invention, sound-absorbing cotton is respectively provided inside the first silencing cavity and the second silencing cavity; and / or sound-absorbing cotton is provided on the top surface of the cover.

[0015] In one embodiment of the present invention, the cover body includes a top plate and side plates connected to the edges of the top plate. The top surface of the top plate is provided with a first sound-absorbing cotton, the bottom surface of the top plate is provided with a second sound-absorbing cotton, and the inner side of the side plate is provided with a third sound-absorbing cotton. The first sound-absorbing cotton and the second sound-absorbing cotton respectively form through holes corresponding to the air inlet.

[0016] and / or,

[0017] The top surface of the exhaust hood is provided with a fourth sound-absorbing cotton, the second silencing cavity is provided with a fifth sound-absorbing cotton, and the fifth sound-absorbing cotton is provided at the bottom of the groove.

[0018] In one embodiment of the present invention, a porous plate covering the air inlet is provided on the cover body, a plurality of sound-absorbing holes are provided on the porous plate, and a gap is left between the porous plate and the cover body.

[0019] In one embodiment of the present invention, the exhaust hood is fixedly connected to the bottom shell, and a positioning structure cooperating with the exhaust hood is provided in the groove; and / or a porous plate covering the air inlet is provided on the cover body, and a plurality of silencer holes are provided on the porous plate.

[0020] According to a second aspect of the present invention, an oxygen production device is provided, comprising a body and the above-mentioned exhaust silencing device.

[0021] In one embodiment of the present invention, a compressor is provided inside the body, the compressor is connected above the exhaust silencer, the outer cover of the compressor is provided with a silencer, and the air inlet of the exhaust silencer is connected to the air duct inside the silencer.

[0022] The beneficial effect of the present invention is that the exhaust hood of the exhaust silencer device separates a first silencer chamber and a second silencer chamber between the cover body and the bottom shell, and the airflow to be noise-reduced can enter the first silencer chamber through the air inlet on the cover body, and then enter the second silencer chamber through the hollow hole on the exhaust hood, and finally be discharged through the air outlet on the bottom shell. The hollow hole is arranged at the end of the exhaust hood away from the air outlet, which extends the path of the airflow through the second silencer chamber and changes the flow direction of the airflow, consumes the energy of the sound, and thus reduces the noise of the airflow; in addition, the cover body, the bottom shell and the exhaust hood also have the advantages of simple structure, easy disassembly and assembly, and low cost.

[0023] Other features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

[0025] Figure 1 This is a three-dimensional diagram of the exhaust silencer provided by the utility model;

[0026] Figure 2 This is a schematic diagram of the bottom structure of the exhaust silencer provided by the utility model;

[0027] Figure 3 This is a top view of the exhaust silencer provided by the utility model;

[0028] Figure 4 yes Figure 3 Sectional view along line AA;

[0029] Figure 5 yes Figure 3 Cross-sectional view along line BB;

[0030] Figure 6 This is an exploded view of the bottom shell and exhaust cover of the exhaust silencer provided by the utility model;

[0031] Figure 7 This is an exploded view of the cover and bottom shell of the exhaust muffler device provided by the present invention;

[0032] Figure 8 yes Figure 7 A schematic diagram of the structure of the exhaust hood;

[0033] Figure 9 This is a structural diagram of the bottom shell and exhaust cover of the exhaust silencer provided by the utility model;

[0034] Figure 10 yes Figure 9 A schematic diagram of the structure of the exhaust hood;

[0035] Figure 11 This is an exploded view of the exhaust silencer provided by the utility model;

[0036] Figure 12 This is a structural diagram of the cover body and sound-absorbing cotton of the exhaust silencer provided by the utility model;

[0037] Figure 13 This is an exploded view of the cover and sound-absorbing cotton of the exhaust silencer provided by the utility model;

[0038] Figure 14 This is a structural diagram of the cover of the exhaust silencer provided by the utility model;

[0039] Figure 15 This is another structural schematic diagram of the cover of the exhaust silencer provided by the utility model;

[0040] Figure 16 This is an exploded view of the first sound-absorbing cotton, the porous plate and the cover of the exhaust silencer provided by the utility model;

[0041] Figure 17 This is a cross-sectional view of the first sound-absorbing cotton, the porous plate and the cover of the exhaust silencer provided by the utility model;

[0042] Figure 18 This is a schematic diagram of the overall structure of the oxygen production equipment provided by the utility model;

[0043] Figure 19 This is a structural diagram of the silencer cover and exhaust silencer device of the oxygen production equipment provided by the utility model;

[0044] Figure 20 It is a schematic diagram of the silencer cover, compressor and exhaust silencer of the oxygen production equipment provided by the utility model.

[0045] Figures 1 to 20 The one-to-one correspondence between the component names and the reference numerals is as follows:

[0046] In the figures, the reference numerals and their corresponding component names are as follows:

[0047] 1. Cover; 11. First air inlet; 12. Second air inlet; 13. Top plate; 14. Side plate;

[0048] 2. Bottom shell; 21. Groove; 22. Air outlet; 23. First positioning groove; 24. Second positioning groove;

[0049] 3. Exhaust hood; 31. Hollow hole; 32. Upper cover plate; 33. Side cover plate; 34. Overlap edge;

[0050] 4. The first silencing chamber;

[0051] 5. Second silencer chamber;

[0052] 6. Gap;

[0053] 7. Sound-absorbing cotton; 71. First sound-absorbing cotton; 72. Second sound-absorbing cotton; 73. Third sound-absorbing cotton; 74. Fourth sound-absorbing cotton; 75. Fifth sound-absorbing cotton;

[0054] 8. Multi-hole plate;

[0055] 9. Machine body; 91. Compressor; 92. Silencer. DETAILED DESCRIPTION

[0056] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention.

[0057] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present invention, its application, or uses.

[0058] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0059] It should be noted that like reference numerals and letters refer to like items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0060] In this document, “top”, “bottom”, “front”, “back”, “upper”, “lower”, etc. are only used to indicate the relative position relationship between related parts, rather than to limit the absolute positions of these related parts.

[0061] In this article, "first", "second", etc. are only used to distinguish each other, and do not indicate the importance and order, or the prerequisite for each other's existence.

[0062] In this document, “equal”, “same”, etc. are not strictly limited in a mathematical and / or geometric sense, but also include errors that can be understood by those skilled in the art and are allowed in manufacturing or use.

[0063] As used herein, unless otherwise specified, "plurality" means two or more.

[0064] Various specific examples of processes and materials are provided herein, but one of ordinary skill in the art may recognize the application of other processes and / or the use of other materials.

[0065] The utility model provides an exhaust silencer device, such as Figures 1 to 17 As shown, the exhaust silencer device includes a cover body 1, a bottom shell 2 and an exhaust cover 3.

[0066] The top of the cover 1 forms an air inlet, and the bottom shell 2 forms a sunken groove 21, one end of which forms an air outlet 22. The exhaust hood 3 is set in the groove 21, one end of the exhaust hood 3 extends to the air outlet 22, and the other end forms a hollow hole 31.

[0067] The cover 1 is connected to the bottom shell 2 and covers the groove 21. A first silencing chamber 4 is formed between the outer side of the exhaust hood 3 and the cover 1. The first silencing chamber 4 is connected to the air inlet. A second silencing chamber 5 is formed between the inner side of the exhaust hood 3 and the bottom shell 2. The second silencing chamber 5 is connected to the air outlet 22.

[0068] The airflow to be noise-reduced enters the first silencing chamber 4 through the air inlet on the cover 1, then enters the second silencing chamber 5 through the hollow hole 31 on the exhaust hood 3, and finally is discharged through the air outlet 22. The airflow from the first silencing chamber 4 through the hollow hole 31 into the second silencing chamber 5 changes its flow direction, consumes sound energy, reduces noise, and thus reduces the noise of the airflow discharged from the air outlet 22.

[0069] Specifically, the hollow hole 31 of the exhaust hood 3 is arranged at the end away from the air outlet 22, which can extend the path of the airflow through the second silencer chamber 5, thereby fully reducing the noise of the airflow. The air inlet can be arranged at the end of the cover body 1 away from the hollow hole 31 to extend the path of the airflow through the first silencer chamber 4 and improve the silencing effect. There are multiple hollow holes 31 on the exhaust hood 3, and they are distributed in an array, which can guide the direction of the airflow and play a silencing role. The air outlet 22 can be arranged on the side wall of the groove 21, or it can be arranged at the bottom of the groove 21.

[0070] The cover 1 is fixedly connected to the bottom shell 2. Specifically, the cover 1 and the bottom shell 2 can be fixedly connected by fasteners, snap connections, plug-in connections, or other detachable methods. The exhaust hood 3 is detachably connected to the groove 21 of the bottom shell 2. The overall structure is simple, the manufacturing cost is low, the installation and removal are convenient, and the noise reduction effect is good.

[0071] The exhaust silencer can be applied to oxygen production equipment. The oxygen production equipment separates nitrogen and oxygen in the air to obtain high-concentration oxygen. A compressor 91 and an air duct for dissipating heat from the compressor 91 are provided inside the oxygen production equipment. The nitrogen separated by the oxygen production equipment and the heat dissipation air in the air duct can enter the exhaust silencer and be discharged. The exhaust silencer can reduce the noise of the airflow and reduce the noise transmitted from the inside of the oxygen production equipment, thereby providing users with a quiet oxygen use environment.

[0072] The exhaust silencer can be arranged below the compressor and located at the bottom of the oxygen production equipment, which can reduce the noise generated by the compressor from being transmitted from the bottom of the oxygen production equipment.

[0073] In one embodiment, Figure 3 and Figure 4 As shown, the air inlet on the cover body 1 includes a first air inlet 11 and a second air inlet 12. The first air inlet 11 and the second air inlet 12 are respectively close to the opposite ends of the cover body 1, and the air flow can enter the first silencer chamber 4 through the first air inlet 11 and the second air inlet 12.

[0074] Air inlets are provided at both ends of the cover 1 to increase the flow rate of air entering the exhaust muffler, ensuring that the cooling air in the air duct effectively dissipates heat from the compressor, thereby preventing the compressor from overheating. Furthermore, the first air inlet 11 and the second air inlet 12 are located near the cylinders at both ends of the compressor 91, allowing the cooling air to quickly remove heat from both ends of the compressor.

[0075] Furthermore, the first air inlet 11 is close to the air outlet 22 of the bottom shell 2, and the second air inlet 12 is close to the hollow hole 31 of the exhaust hood 3. After the airflow enters the second air inlet 12, it can quickly pass through the hollow hole 31 into the second silencer chamber 5, reducing the obstruction to the airflow, so that the airflow can be discharged smoothly, ensuring the heat dissipation effect of the compressor.

[0076] In a specific embodiment, Figure 3 and Figure 4 As shown, the opening area of ​​the first air inlet 11 is larger than that of the second air inlet 12. The airflow entering the first air inlet 11 is greater than that entering the second air inlet 12. More air flows through the first air inlet 11 into the first muffler chamber 4, creating a longer flow path within the first muffler chamber 4 and fully utilizing the noise reduction effect of the first muffler chamber 4. Furthermore, the purpose of providing the second air inlet 12 is to dissipate heat generated by the compressor above it, thereby preventing heat accumulation above it and thereby reducing its overall heat dissipation performance.

[0077] In some embodiments, as Figure 5 、 Figure 6 and Figure 7As shown, the hollow holes 31 are distributed on the top and side surfaces of the exhaust hood 3, and a gap 6 is formed between the side surface of the exhaust hood 3 and the side wall of the groove 21, and the gap 6 is connected to the first silencer chamber 4. Part of the gas in the first silencer chamber 4 can enter the gap 6, and then enter the second silencer chamber 5 through the hollow holes 31 on the side surface of the exhaust hood 3, which can reduce the obstruction of the exhaust hood 3 to the airflow. The exhaust hood 3 can be set to a U-shaped structure or an arc-shaped structure. One end of the exhaust hood 3 surrounds the air outlet 22, so that the airflow can only pass through the second silencer chamber 5 to reach the air outlet 22.

[0078] The exhaust cover 3 includes an upper cover plate 32 and at least one side cover plate 33. Hollow holes 31 are distributed on the upper cover plate 32 and the side cover plates 33. Gaps 6 are formed between the side cover plates 33 and the corresponding side walls of the groove 21.

[0079] In a specific embodiment, the exhaust hood 3 includes an upper cover plate 32 and a side cover plate 33 , and forms an L-shaped structure.

[0080] In a specific embodiment, Figure 6 and Figure 8 As shown, the exhaust hood 3 includes an upper cover plate 32 and two side cover plates 33, and the two side cover plates 33 are respectively connected to the opposite side edges of the upper cover plate 32. The first silencer chamber 4 is located on the outside of the upper cover plate 32, the second silencer chamber 5 is located between the upper cover plate 32 and the two side cover plates 33, and a gap 6 is formed between the side cover plates 33 and the side walls of the groove 21. The hollow hole 31 is arranged at one end of the upper cover plate 32 and the two side cover plates 33 away from the air outlet 22. The bottom of the two side cover plates 33 is against the bottom of the groove 21, and one end of the upper cover plate 32 and the two side cover plates 33 extends to the air outlet 22, and the other end extends to the side wall of the groove 21 opposite to the air outlet 22.

[0081] In another specific embodiment, Figure 9 and Figure 10 As shown, the exhaust hood 3 includes an upper hood plate 32 and three side hood plates 33. One side edge of the upper hood plate 32 is close to the air outlet 22, and the three side hood plates 33 are respectively connected to the edge of the upper hood plate 32 away from the air outlet 22. Adjacent side hood plates 33 are connected to each other.

[0082] The first muffler chamber 4 is located outside the upper cover plate 32 , and the second muffler chamber 5 is located between the upper cover plate 32 and the three side cover plates 33 . Gaps 6 are formed between the three side cover plates 33 and the side walls of the groove 21 .

[0083] The arrangement of the first air inlet 11 and the second air inlet 12, as well as the structural arrangement of the exhaust hood 3, enables the exhaust silencer device to increase the exhaust volume to ensure the heat dissipation effect, and to fully reduce the noise of the airflow to ensure the noise reduction effect.

[0084] In some embodiments, as Figure 6 As shown, a positioning structure can be provided on the bottom shell 2, and the positioning structure cooperates with the exhaust hood 3 to define the installation position of the exhaust hood 3. Furthermore, the exhaust hood 3 can be fixedly connected to the bottom shell 2 by fasteners such as screws.

[0085] Specifically, the positioning structure includes a first positioning groove 23 provided at the bottom of the groove 21, and the bottom of the side cover plate 33 of the exhaust hood 3 is snap-fitted with the first positioning groove 23. The positioning structure also includes a second positioning groove 24 provided at the edge of the groove 21. The second positioning groove 24 is located at the top of the air outlet 22. The edge of the upper cover plate 32 of the exhaust hood 3 is provided with a lap 34, which can fit into the second positioning groove 24. The exhaust hood 3 is installed in place under the constraints of the positioning structure, and the edges of the exhaust hood 3 are abutted against the bottom shell 2. The airflow can only enter the second muffler chamber 5 through the hollow hole 31, avoiding the formation of a gap between the exhaust hood 3 and the bottom shell 2 that affects the flow path of the airflow.

[0086] In some embodiments, sound-absorbing cotton 7 is respectively provided inside the first silencing chamber 4 and / or the second silencing chamber 5 , and the sound-absorbing cotton 7 can absorb the noise of the airflow in the first silencing chamber 4 and / or the second silencing chamber 5 .

[0087] In some embodiments, the top surface of the cover 1 is provided with sound-absorbing cotton 7. The exhaust and silencer is provided at the bottom of the oxygen generator, and the compressor is located above the cover 1. The sound-absorbing cotton 7 on the top surface of the cover 1 can absorb the noise of the compressor.

[0088] The sound-absorbing cotton 7 can be arranged in a layered structure and fixedly connected to the cover 1, the bottom shell 2 or the exhaust cover 3 by bonding, clamping, fastener connection, etc. The sound-absorbing cotton 7 can be made of porous sound-absorbing cotton, such as inorganic fiber, organic fiber, inorganic foam, foam plastic, etc., or other existing sound-absorbing cotton.

[0089] It should be noted that sound-absorbing cotton mainly achieves noise reduction through its internal porous structure and fiber material. When sound enters the sound-absorbing cotton, the sound waves cause the internal material to vibrate, and then convert the sound wave capacity into tiny heat energy through its fiber material, so that the sound intensity becomes weaker. However, if too much sound-absorbing cotton is installed, the heat dissipation performance will be reduced. Therefore, it is necessary to reasonably distribute the setting position of the sound-absorbing cotton and the patency of the airway to ensure the heat dissipation and quietness of the equipment.

[0090] In some embodiments, sound-absorbing cotton 7 is provided on the top of the cover 1 and in the first silencing cavity 4. Specifically, Figure 11 、 Figure 12 、 Figure 13As shown, the cover body 1 includes a top plate 13 and side plates 14. The side plates 14 are connected to the four edges of the top plate 13. The top surface of the top plate 13 is provided with a first sound-absorbing cotton 71, which is used to reduce the internal noise of the oxygen production equipment. The bottom surface of the top plate 13 is provided with a second sound-absorbing cotton 72, and the inner side of the side plate 14 is provided with a third sound-absorbing cotton 73. The second sound-absorbing cotton 72 and the third sound-absorbing cotton 73 are arranged in the first silencer chamber 4 to absorb the noise of the airflow in the first silencer chamber 4. The first sound-absorbing cotton 71 and the second sound-absorbing cotton 72 respectively form through holes corresponding to the air inlets. In detail, the first sound-absorbing cotton 71 and the second sound-absorbing cotton 72 respectively form through holes corresponding to the first air inlet 11 and the second air inlet 12, exposing the first air inlet 11 and the second air inlet 12 to facilitate the rapid circulation of air.

[0091] A fourth sound-absorbing cotton pad 74 is provided on the top surface of the exhaust hood 3. The fourth sound-absorbing cotton pad 74 is configured to avoid the gap 6 on the side of the exhaust hood 3 and the hollow hole 31 on the top surface of the exhaust hood 3, thereby reducing the air intake resistance and allowing the airflow in the first silencing chamber 4 to pass smoothly through the exhaust hood 3 into the second silencing chamber 5. The fourth sound-absorbing cotton pad 74 is located in the first silencing chamber 4 and absorbs the noise of the airflow in the first silencing chamber 4.

[0092] The second sound-absorbing cotton 72 , the third sound-absorbing cotton 73 and the fourth sound-absorbing cotton 74 surround the inner wall of the first silencing cavity 4 . When the airflow passes through the space surrounded by the second sound-absorbing cotton 72 , the third sound-absorbing cotton 73 and the fourth sound-absorbing cotton 74 , the sound is absorbed.

[0093] Further, if Figure 4 、 Figure 5 、 Figure 6 As shown, a fifth sound-absorbing cotton 75 is provided in the second silencing cavity 5 . The fifth sound-absorbing cotton 75 is provided at the bottom of the groove 21 and can reduce the noise of the airflow in the second silencing cavity 5 .

[0094] Sound-absorbing cotton can also be set on the side walls of the groove 21 and the outside of the side cover plate 33 of the exhaust hood 3 to reduce the noise of the airflow in the gap 6. The sound-absorbing cotton in the gap 6 needs to avoid the hollow hole 31 on the side of the exhaust hood 3.

[0095] The first sound-absorbing cotton 71, the second sound-absorbing cotton 72, the fourth sound-absorbing cotton 74 and the fifth sound-absorbing cotton 75 are arranged below the compressor to form a multi-layer sound-absorbing structure, which can fully isolate the noise generated by the compressor and effectively prevent the noise of the compressor from being transmitted from the bottom of the oxygen production equipment.

[0096] In some embodiments, as Figure 5 As shown, the area covered by the cover 1 is larger than the groove 21, and the space in the first silencing chamber 4 is larger than the space in the second silencing chamber 5. This can achieve the effect of variable-diameter sound reduction, and the airflow stays in the first silencing chamber 4 longer, effectively reducing noise. The fourth sound-absorbing cotton 74 extends to the edge of the groove 21, fully surrounding the first silencing chamber 4.

[0097] In one embodiment, Figure 14 As shown, the air inlet on the cover body 1 is a single through hole. Specifically, the first air inlet 11 and the second air inlet 12 are single through holes, respectively, and the first air inlet 11 and the second air inlet 12 are close to opposite ends of the cover body 1 and extend to opposite sides of the cover body 1 to increase the opening area.

[0098] In one embodiment, Figure 15 As shown, the air inlet on the cover 1 is composed of a plurality of small holes distributed in an array. Specifically, the first air inlet 11 and the second air inlet 12 are each composed of multiple small holes, which have a sound-absorbing effect and can reduce the noise of the passing airflow. Furthermore, the total area of ​​all the small holes in the first air inlet 11 is greater than the total area of ​​all the small holes in the second air inlet 12, thereby ensuring that the air intake of the first air inlet 11 is greater than that of the second air inlet 12.

[0099] In one embodiment, Figure 16 and Figure 17 As shown, the cover body 1 is provided with a porous plate 8 covering the air inlet, and the porous plate 8 is provided with a plurality of silencer holes, which has a noise reduction effect.

[0100] Specifically, the porous plate 8 is arranged between the top surface of the cover body 1 and the first sound-absorbing cotton 71. The airflow enters the air inlet of the cover body 1 after passing through the silencer holes on the porous plate 8. The silencer holes can initially reduce the noise of the airflow.

[0101] Furthermore, a gap is left between the porous plate 8 and the cover 1 , and the airflow speed can be increased by providing the porous plate 8. Specifically, a gap is left between the porous plate 8 and the top plate 13 of the cover 1 .

[0102] The porous plate 8 can support the first sound-absorbing cotton 71. Through the arrangement of the first sound-absorbing cotton 71, the porous plate 8, and the top plate 13 of the cover body 1, the sound-absorbing effect of increasing the diameter of the airflow passing through and extending the path can be achieved.

[0103] The utility model also provides an oxygen production device, such as Figures 18 to 20 As shown, the oxygen production equipment includes a body 9 and an exhaust silencer provided by the utility model. The specific structure, principle, function, etc. of the exhaust silencer can be referred to the above introduction of the utility model, so it will not be repeated here.

[0104] In some embodiments, a compressor 91 is provided inside the body 9, and an exhaust muffler is provided at the bottom of the body 9. The compressor 91 is connected above the exhaust muffler, and a muffler cover 92 is provided on the outer cover of the compressor 91.

[0105] Specifically, the bottom of the muffler cover 92 is opened, and the exhaust muffler is connected to the bottom of the muffler cover 92. The bottom edge of the muffler cover 92 can be fixedly connected to the cover 1 or the bottom shell 2 of the exhaust muffler. The compressor 91 is located in the cavity enclosed by the exhaust muffler and the muffler cover 92, which can reduce the noise generated by the compressor 91 from being transmitted out of the machine body 9. The exhaust muffler can also serve as a mounting base for the compressor 91.

[0106] An air duct is formed inside the muffler cover 92, and the air flow in the air duct can remove the heat of the compressor 91 to prevent the compressor 91 from overheating. The air inlet of the exhaust muffler is connected to the air duct inside the muffler cover 92, and the air flow in the air duct can enter the exhaust muffler through the air inlet and be discharged through the air outlet 22 of the exhaust muffler after being silenced and noise reduced.

[0107] Specifically, the compressor 91 adopts an oil-free air compressor, and the first air inlet 11 and the second air inlet 12 of the exhaust silencer are respectively close to the cylinders at opposite ends of the compressor 91, so that the airflow can quickly dissipate heat from the cylinders.

[0108] A molecular sieve device is also provided in the body 9 to separate nitrogen and oxygen in the air. The separated nitrogen can be discharged into the air duct in the silencer cover 92. The nitrogen enters the exhaust silencer along with the air flow in the air duct, and is discharged through the air outlet 22 of the exhaust silencer after being silenced and noise reduced.

[0109] The exhaust silencer and the silencer cover 92 sufficiently reduce the noise generated by the compressor 91. The exhaust silencer can also silence and reduce the noise of the airflow to be discharged from the body 9, thereby providing a quiet oxygen use environment for users.

[0110] While various embodiments of the present invention have been described above, the above descriptions are illustrative, non-exhaustive, and not intended to be limiting of the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is selected to best explain the principles of the embodiments, their practical applications, or technological improvements in the marketplace, or to enable others skilled in the art to understand the embodiments disclosed herein. The scope of the present invention is defined by the appended claims.

Claims

1. An exhaust silencer, characterized in that: include: a cover body, the top of which forms an air inlet; A bottom shell, which forms a sunken groove, one end of which forms an air outlet; an exhaust hood, which is arranged in the groove, with one end extending to the air outlet and the other end forming a hollow hole; Wherein, the cover body is connected to the bottom shell and covers the groove, a first silencer cavity connected to the air inlet is formed between the outer side of the exhaust hood and the cover body, and a second silencer cavity connected to the air outlet is formed between the inner side of the exhaust hood and the bottom shell.

2. The exhaust muffler device according to claim 1, characterized in that: The air inlet includes a first air inlet and a second air inlet respectively close to opposite ends of the cover body, the first air inlet is close to the air outlet of the bottom shell, and the second air inlet is close to the hollow hole of the exhaust hood.

3. The exhaust muffler device according to claim 2, characterized in that: An opening area of ​​the first air inlet is larger than an opening area of ​​the second air inlet.

4. The exhaust muffler device according to claim 1, characterized in that: The hollow holes are distributed on the top surface and side surfaces of the exhaust cover, and a gap is formed between the side surfaces of the exhaust cover and the side walls of the groove, and the gap is communicated with the first silencing cavity.

5. The exhaust muffler device according to claim 1, characterized in that: The first silencing cavity and / or the second silencing cavity are respectively provided with sound-absorbing cotton; and / or the top surface of the cover is provided with sound-absorbing cotton.

6. The exhaust muffler device according to claim 5, characterized in that: The cover body includes a top plate and side plates connected to the edges of the top plate. The top surface of the top plate is provided with a first sound-absorbing cotton, the bottom surface of the top plate is provided with a second sound-absorbing cotton, and the inner side of the side plate is provided with a third sound-absorbing cotton. The first sound-absorbing cotton and the second sound-absorbing cotton respectively form through holes corresponding to the air inlet. and / or, The top surface of the exhaust hood is provided with a fourth sound-absorbing cotton, the second silencing cavity is provided with a fifth sound-absorbing cotton, and the fifth sound-absorbing cotton is provided at the bottom of the groove.

7. The exhaust muffler device according to claim 1, characterized in that: The cover body is provided with a porous plate covering the air inlet, the porous plate is provided with a plurality of sound-absorbing holes, and a gap is left between the porous plate and the cover body.

8. The exhaust muffler device according to any one of claims 1 to 7, characterized in that: The exhaust cover is fixedly connected to the bottom shell, and a positioning structure that cooperates with the exhaust cover is provided in the groove; and / or, The cover body is provided with a porous plate covering the air inlet, and the porous plate is provided with a plurality of sound-absorbing holes.

9. An oxygen production equipment, characterized in that: It comprises a machine body and also comprises the exhaust silencer device according to any one of claims 1 to 8.

10. The oxygen production equipment according to claim 9, characterized in that: A compressor is provided inside the machine body, and the compressor is connected above the exhaust silencer. An external cover of the compressor is provided with a silencer cover, and an air inlet of the exhaust silencer is communicated with an air duct in the silencer cover.

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