Silencing structure and oxygen generator

Abstract

The utility model relates to a silencing structure and an oxygen generator, and relates to the field of oxygen generation equipment. The utility model provides a noise elimination structure which comprises a shell, and a first noise elimination unit and a second noise elimination unit are arranged in the shell. A sound absorption piece is arranged in the first silencing unit; the second silencing unit comprises at least two stages of expansion cavities, and corresponding air holes are formed between every two adjacent expansion cavities to form a gas bending flow channel; gas enters from the first silencing unit, passes through the sound absorption part, enters the expansion cavities of all stages, passes through the gas bending flow channel and then is discharged out of the shell. The sound absorption piece is arranged in the first silencing unit, so that the sound absorption piece conducts resistive silencing on airflow; at least two stages of expansion cavities are formed in the second silencing unit and are used for reducing the wind resistance of airflow flowing in the gas bending flow channel, and resistant silencing is carried out on the airflow; the noise elimination structure realizes impedance composite noise elimination, reduces nitrogen exhaust noise, and solves the technical problem of poor effect of the existing nitrogen exhaust noise elimination structure.

Description

Technical Field

[0001] The utility model relates to the field of oxygen production equipment, in particular to a sound-absorbing structure and an oxygen generator. Background Art

[0002] The existing oxygen concentrators are noisy, and the noise mainly comes from the suction and closing sounds of the compressor and solenoid valve and the sound of nitrogen discharge.

[0003] The inventors have discovered that exhaust nitrogen is discharged into the compressor compartment or the bottom of the compressor compartment through a muffler. This structural design results in poor sealing of the expansion chamber, and the air inlet and outlet are large in size, which cannot effectively cause reflection and interference of sound waves to achieve silencing, resulting in poor silencing effect and high noise. Utility Model Content

[0004] The purpose of the utility model is to provide a silencer structure and an oxygen concentrator, so as to solve the technical problem that the silencer structure for nitrogen emission of the existing oxygen concentrator has poor silencer effect.

[0005] The embodiment of the present utility model is achieved as follows:

[0006] In the first aspect, the utility model proposes a sound-absorbing structure, comprising a shell, in which a first sound-absorbing unit and a second sound-absorbing unit are provided; a sound-absorbing component is provided in the first sound-absorbing unit; the second sound-absorbing unit comprises at least two levels of expansion chambers, and corresponding air holes are provided between each adjacent expansion chamber to form a gas bending flow channel; wherein, the gas enters from the first sound-absorbing unit and passes through the sound-absorbing component, then enters the expansion chambers at each level and is discharged from the shell through the gas bending flow channel.

[0007] Optionally, the at least two-stage expansion chamber includes a primary expansion chamber and at least one secondary expansion chamber that are connected in sequence, and the at least one secondary expansion chamber is at least arranged at the end of the primary expansion chamber.

[0008] Optionally, the first muffler unit includes a first expansion chamber;

[0009] The first-level expansion chamber includes a second expansion chamber and a third expansion chamber that are connected in sequence, and the second expansion chamber is connected to the first expansion chamber;

[0010] The secondary expansion chambers include two, and the two secondary expansion chambers are symmetrically arranged on both sides of the third expansion chamber.

[0011] Optionally, one of the secondary expansion chambers includes a fourth expansion chamber and a fifth expansion chamber that are sequentially connected, the fourth expansion chamber is connected to the third expansion chamber, and the fifth expansion chamber is provided with an air outlet;

[0012] Another second muffler unit includes a sixth expansion chamber and a seventh expansion chamber that are connected in sequence, the sixth expansion chamber is connected to the third expansion chamber, and the seventh expansion chamber is provided with an air outlet.

[0013] Optionally, the air outlet includes a plurality of exhaust holes arranged in a matrix or an annular arrangement;

[0014] The sound absorbing member is a porous sound absorbing material or a sound absorbing structure.

[0015] In a second aspect, the present invention further proposes an oxygen concentrator, comprising the muffler structure described in any one of the above items and a molecular sieve, wherein the molecular sieve is provided with a nitrogen exhaust port, and the nitrogen exhaust port is connected to the first muffler unit.

[0016] Optionally, the oxygen concentrator further includes a compressor cabin and a base, and the compressor cabin is arranged on the top of the base;

[0017] A sealed installation cavity and a first opening and a second opening communicating with the installation cavity are provided in the compressor compartment. The muffler structure is provided in the compressor compartment, and an air outlet of the muffler structure communicates with the installation cavity.

[0018] The first opening is used for air intake, and the installation cavity is connected to the base through the second opening for exhaust.

[0019] Optionally, a pipeline structure is provided outside the compressor compartment, one end of the pipeline structure is used for air intake, and the other end is connected to the installation cavity through the first opening;

[0020] An exhaust component is also provided in the pipeline structure, and the exhaust component is arranged at the first opening.

[0021] Optionally, the molecular sieve is arranged on the outer side wall of the compressor compartment, and the sound-absorbing structure is arranged on the inner side wall of the compressor compartment and close to the molecular sieve.

[0022] Optionally, the oxygen concentrator further comprises a compressor and a muffler compartment, and the compressor shock absorber is arranged in the compressor compartment;

[0023] The air outlet of the compressor is connected to the air inlet of the molecular sieve through a pipeline;

[0024] The muffler compartment is arranged on the compressor compartment, and the air inlet end of the compressor is connected to the outside through the muffler compartment.

[0025] The beneficial effects of the embodiments of the present utility model are:

[0026] The silencer structure and oxygen concentrator proposed by the present invention are configured with a sound absorbing component in the first silencer unit so that the sound absorbing component performs resistive silence on the airflow; at least two-stage expansion chambers are configured in the second silencer unit to reduce the wind resistance of the airflow entering the gas bending flow channel, thereby performing resistive silence on the airflow entering the gas bending flow channel; the silencer structure configured in this way combines the first silencer unit and the second silencer unit to achieve impedance composite silencer, reduce nitrogen exhaust noise, and solve the technical problem of poor effect of existing nitrogen exhaust silencer structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 This is a schematic structural diagram of an oxygen concentrator according to an embodiment of the present invention;

[0029] Figure 2 This is a schematic structural diagram of the sound-absorbing structure of an embodiment of the utility model;

[0030] Figure 3 This is a top view of the noise reduction structure according to an embodiment of the present utility model;

[0031] Figure 4 This is a schematic diagram of the lower shell of the sound-absorbing structure of an embodiment of the present utility model.

[0032] Icons: 010-oxygen concentrator; 100-silencer structure; 101-shell; 1011-upper shell; 1012-lower shell; 102-air inlet; 103-air outlet; 104-sound-absorbing component; 110-first silencer unit; 111-first expansion chamber; 120-second silencer unit; 121-expansion chamber; 122-second expansion chamber; 123-third expansion chamber; 124-fourth expansion chamber; 125-fifth expansion chamber; 126-sixth expansion chamber; 127-seventh expansion chamber; 128-connecting port; 200-molecular sieve; 300-compressor; 310-inlet pipe; 320-outlet pipe; 400-compressor compartment; 410-installation cavity; 420-pipeline structure; 430-exhaust component; 440-silencer compartment; 500-base. DETAILED DESCRIPTION

[0033] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0035] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0036] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is typically placed when in use. These terms are intended solely to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0037] Furthermore, terms such as "horizontal" and "vertical" do not necessarily mean that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0038] It should also be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0039] This embodiment provides an oxygen concentrator 010, in which a silencer structure 100 is directly built into a compressor compartment 400, and impedance composite silencer is adopted to solve the technical problem of poor effect of existing nitrogen exhaust silencer structures.

[0040] Please refer to Figure 1 The oxygen concentrator 010 proposed in this embodiment includes a muffler structure 100 and a molecular sieve 200. The molecular sieve 200 is provided with a nitrogen exhaust port, which is connected to the air inlet 102 of the first muffler unit 110.

[0041] It is understandable that connecting the nitrogen exhaust port of the molecular sieve 200 with the air inlet 102 of the silencer structure 100 can reduce the noise of nitrogen exhaust from the nitrogen exhaust port and solve the technical problem of poor effect of the existing nitrogen exhaust silencer structure.

[0042] Please refer to Figure 1 In this embodiment, the oxygen concentrator 010 includes a compressor 300 .

[0043] In this embodiment, the compressor 300 is used to compress air. The compressor 300 sucks in gas and compresses it, and then introduces the compressed air into the molecular sieve 200 for separation.

[0044] Among them, the compressor 300 is arranged in the compressor compartment 400, and is connected to the bottom wall of the compressor compartment 400 through elastic parts for shock absorption; the compressor 300 includes at least one air inlet end and an air outlet end, the air inlet end of the compressor 300 is connected to the silencer chamber 440 through the air inlet pipe 310, and the air outlet end of the compressor 300 is connected to the air inlet end of the molecular sieve 200 through the air outlet pipe 320.

[0045] Please refer to Figure 1 In this embodiment, the oxygen concentrator 010 includes a molecular sieve 200 .

[0046] In this embodiment, at least one molecular sieve 200 is provided on the sidewall of the compressor compartment 400. The molecular sieve 200 includes an air inlet, a nitrogen outlet for discharging nitrogen, and an oxygen outlet for discharging oxygen. The nitrogen outlet is connected to the air inlet 102 of the muffler structure 100 via a pipe, and the oxygen outlet is connected to the oxygen storage tank via a pipe.

[0047] Specifically, the molecular sieve 200 is used to separate compressed air into oxygen and other gases. The air intake of the compressor 300 draws air and compresses it into high-pressure gas, which is then fed into the molecular sieve 200. The molecular sieve 200 then separates the air into oxygen and other gases, completing the oxygen production of the oxygen concentrator 010 and outputting the separated oxygen to the oxygen storage tank for storage. The other gases are discharged through the nitrogen exhaust port into the sound-absorbing structure 100 for noise reduction before being discharged.

[0048] Please refer to Figure 1In this embodiment, the oxygen concentrator 010 includes a compressor compartment 400 and a base 500 .

[0049] In this embodiment, a compressor compartment 400 is provided on the top of the base 500, and the compressor compartment 400 is sealedly connected to the base 500 to ensure the sealing performance of the installation cavity 410 in the compressor compartment 400; it can be understood that the installation cavity 410 with better sealing performance can also further isolate the nitrogen exhaust noise.

[0050] In this embodiment, the compressor compartment 400 is a shell structure, which is sealed to form a sealed installation cavity 410, and a first opening and a second opening connected to the installation cavity 410 are provided on the shell structure; wherein, the first opening is provided at the top of the compressor compartment 400 and is used for air intake in the installation cavity 410; wherein, the second opening is provided at the bottom of the compressor compartment 400, and the installation cavity 410 is connected to the base 500 through the second opening for exhaust.

[0051] In this embodiment, a compressor 300 and a sound-absorbing structure 100 are installed in a compressor compartment 400, and a molecular sieve 200 is installed outside the compressor compartment 400. The compressor 300 is mounted in a mounting cavity 410 of the compressor compartment 400 and is damped by a shock-absorbing spring within the compressor compartment 400. The molecular sieve 200 is mounted on the outer wall of the compressor compartment 400, and the sound-absorbing structure 100 is mounted on the inner wall of the compressor compartment 400, adjacent to the molecular sieve 200.

[0052] Optionally, a pipe structure 420 is provided outside the compressor compartment 400, and the pipe structure 420 is arranged along the outer wall of the compressor compartment 400 and forms a ventilation cavity inside to allow gas to pass through; one end of the pipe structure 420 is used for air intake, and the other end is connected to the installation cavity 410 through the first opening; at the same time, an exhaust piece 430 is also provided inside the pipe structure 420, and the exhaust piece 430 is arranged at the first opening.

[0053] Optionally, the exhaust member 430 may be a structure such as a blower or a fan that can drive the rapid flow of gas.

[0054] Optionally, the compressor compartment 400 is further provided with a third opening connected to the mounting cavity 410. The third opening is provided at the top of the compressor compartment 400 and is used for the passage of the air intake pipe 310 of the compressor 300. Furthermore, a muffler compartment 440 is provided on the outer top wall of the compressor compartment 400. The muffler compartment 440 is arranged opposite the third opening, and the air intake end of the compressor 300 is connected to the outside through the muffler compartment 440.

[0055] In this embodiment, a cavity structure for silencing is provided in the base 500, and the base 500 is connected to the installation cavity 410 of the compressor compartment 400 through a second opening; it can be understood that the gas in the pipe structure 420 is passed into the compressor compartment 400 through the exhaust piece 430 and dissipates heat and cools the compressor 300 in the compressor compartment 400, and the cooled gas enters the base 500 through the second opening for silencing and noise reduction before being discharged.

[0056] Please refer to Figure 1 In this embodiment, the oxygen concentrator 010 includes a sound-absorbing structure 100 .

[0057] Please refer to Figure 2-Figure 4 A sound attenuation structure 100 proposed in this embodiment includes a shell 101, in which a first sound attenuation unit 110 and a second sound attenuation unit 120 are provided; a sound absorbing member 104 is provided in the first sound attenuation unit 110; the second sound attenuation unit 120 includes at least two levels of expansion chambers 121, and corresponding air holes are provided between each adjacent expansion chamber 121 to form a gas bending flow channel; wherein, the gas enters from the first sound attenuation unit 110 and passes through the sound absorbing member 104, then enters the expansion chambers 121 at each level, passes through the gas bending flow channel, and is discharged from the shell 101.

[0058] Further, refer to Figure 1 , Figure 1 The arrows indicate the direction of airflow. First muffler unit 110 is connected to the exhaust port of an external device. Airflow from first muffler unit 110 enters second muffler unit 120, enters each level of expansion chamber 121, and exits housing 101 through the gas bend channel. The exhaust port of the external device is the nitrogen outlet for the molecular sieve 200 of oxygen concentrator 010.

[0059] It can be understood that by arranging the sound absorbing member 104 in the first silencer unit 110, the sound absorbing member 104 can perform resistive silence on the airflow; by arranging at least two-stage expansion chambers 121 in the second silencer unit 120, at least two-stage expansion chambers 121 can reduce the wind resistance of the airflow entering the gas bending flow channel, and resistive silence is performed on the airflow entering the gas bending flow channel; the silencer structure 100 arranged in this way combines the first silencer unit 110 and the second silencer unit 120, realizes impedance composite silencer, reduces nitrogen exhaust noise, and solves the technical problem of poor effect of existing nitrogen exhaust silencer structures.

[0060] In this embodiment, the sound absorption structure 100 includes a shell 101 .

[0061] In this embodiment, please refer to Figure 2 The shell 101 includes an upper shell 1011 and a lower shell 1012, and the upper shell 1011 and the lower shell 1012 are installed to form an internal cavity; the cavity forms a first sound-absorbing unit 110 and at least two second sound-absorbing units 120.

[0062] Among them, an air inlet 102 is provided at one end of the first sound-absorbing unit 110, at least two second sound-absorbing units 120 are respectively connected to at least two connecting ports 128 and are connected to the first sound-absorbing unit 110, and an air outlet 103 is provided at one end of the second sound-absorbing unit 120 away from the connecting port 128; at the same time, at least two levels of expansion chambers 121 are formed in the second sound-absorbing unit 120, and corresponding air holes are set between each adjacent expansion chamber 121 to form a gas bending flow channel.

[0063] An air intake pipe 310 structure is provided at the air intake port 102 .

[0064] Optionally, the at least two-stage expansion chamber 121 includes a first-stage expansion chamber and at least one second-stage expansion chamber connected in sequence, and the at least one second-stage expansion chamber is at least arranged at the end of the first-stage expansion chamber; the first-stage expansion chamber and the at least one second-stage expansion chamber form a gas bending flow channel, and the gas flows in the gas bending flow channel and the wind resistance of the gas gradually decreases, thereby achieving resistance to airflow silencing.

[0065] The expansion chambers 121 can be configured with two or three stages, etc., and can be configured specifically according to the model of the oxygen concentrator 010 to achieve the best noise reduction effect. Accordingly, the expansion chambers 121 are connected via the connection ports 128 .

[0066] In this embodiment, please refer to Figure 3-Figure 4 A first expansion chamber 111 is formed in the first muffler unit 110; the expansion chamber 121 in the second muffler unit 120 includes a primary expansion chamber and two secondary expansion chambers, and the two secondary expansion chambers are symmetrically arranged on both sides of the end of the primary expansion chamber.

[0067] A first expansion chamber 111 is formed in the first muffler unit 110 , and an air inlet 102 is provided in the first expansion chamber 111 .

[0068] The primary expansion chamber in the second muffler unit 120 includes a second expansion chamber 122 and a third expansion chamber 123 that are connected in sequence; the second expansion chamber 122 is connected to the first expansion chamber 111; and the third expansion chamber 123 is provided with two connecting ports 128. The two connecting ports 128 are symmetrically arranged on both sides of the third expansion chamber 123.

[0069] Among them, one of the second muffler units 120 is provided with a fourth expansion chamber 124 and a fifth expansion chamber 125 which are connected in sequence. The fourth expansion chamber 124 is connected with one of the third expansion chambers 123 through a connecting port 128 , and the fifth expansion chamber 125 is provided with an air outlet 103 .

[0070] The other second muffler unit 120 is provided with a sixth expansion chamber 126 and a seventh expansion chamber 127 which are connected in sequence. The sixth expansion chamber 126 is connected with the third expansion chamber 123 via a connecting port 128 , and the seventh expansion chamber 127 is provided with an air outlet 103 .

[0071] In this embodiment, please refer to Figure 2-Figure 3 The air outlet 103 includes a plurality of exhaust holes arranged in a matrix. Of course, in other embodiments, the air outlet 103 includes a plurality of exhaust holes arranged in a ring.

[0072] In this embodiment, please refer to Figure 3-Figure 4 The multiple expansion chambers 121 can be rectangular structures or cylindrical structures, and the multiple expansion chambers 121 are arranged at intervals; at the same time, the connecting port 128 can be set to a small-diameter pipe mouth structure, so as to achieve better resistance and sound insulation.

[0073] Among them, multiple expansion chambers 121 and small-diameter nozzle structures are formed by connecting the upper shell 1011 and the lower shell 1012.

[0074] Please refer to Figure 4 In this embodiment, the sound absorption structure 100 includes a sound absorbing member 104 .

[0075] Optionally, the sound absorbing member 104 is a porous sound absorbing material or a sound absorbing structure. The porous sound absorbing material may be sound absorbing cotton, glass fiber yarn, low carbon steel wire mesh, felt, etc. The sound absorbing structure may be a honeycomb structure or a multilayer board structure disposed in the cavity.

[0076] In this embodiment, please refer to Figure 4 , the sound absorbing member 104 is arranged in the first expansion chamber 111 .

[0077] The working principles of the noise reduction structure 100 and the oxygen generator 010 proposed in this embodiment are:

[0078] When compressor 300 is operating, gas is drawn into the inlet of compressor 300 through muffler chamber 440 and inlet pipe 310. Compressor 300 compresses the gas and then directs the compressed air from the outlet of compressor 300 into molecular sieve 200 for separation. Molecular sieve 200 separates the compressed air into oxygen and other gases, completing oxygen production in oxygen concentrator 010 and outputting the separated oxygen to an oxygen storage tank for storage. Other gases are discharged through the nitrogen outlet into muffler structure 100 for noise reduction before being discharged.

[0079] The nitrogen exhaust port of the molecular sieve 200 discharges air flow, and the air flow enters the silencer structure 100 through the air inlet 102. The air flow is in the first expansion chamber 111, and the sound-absorbing component 104 in the first expansion chamber 111 performs resistive silence on the air flow; then the air flow flows from the first expansion chamber 111 to the second expansion chamber 122 and the third expansion chamber 123 in sequence, and multiple expansion chambers 121 buffer and reduce noise for the air flow; the air flow is diverted in the third expansion chamber 123, and part of the air flow is diverted to the fourth expansion chamber 124 and the fifth expansion chamber 125, and is discharged from the air outlet 103 at the fifth expansion chamber 125 to the installation cavity 410 of the compressor cabin 400; the other part of the air flow is diverted to the sixth expansion chamber 126 and the seventh expansion chamber 127, and is discharged from the air outlet 103 at the seventh expansion chamber 127 to the installation cavity 410 of the compressor cabin 400.

[0080] The airflow enters the installation cavity 410 , which can further isolate the nitrogen exhaust noise due to its good sealing performance; then the airflow enters the base 500 through the second opening and is exhausted.

[0081] In summary, the silencer structure 100 and the oxygen concentrator 010 proposed in the present invention perform resistive silence on the airflow by providing a sound-absorbing member 104; and perform resistive silence on the airflow entering the cavity by providing a plurality of expansion chambers 121 that are spaced apart and connected to each other to reduce the wind resistance of the airflow entering the cavity; the combination of the two realizes impedance composite silencer, reduces nitrogen exhaust noise, and solves the technical problem of poor effect of existing nitrogen exhaust silencer structures.

[0082] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A sound-absorbing structure, characterized in that: include: a housing, wherein a first muffler unit and a second muffler unit are provided in the housing; a first sound-absorbing unit, wherein a sound-absorbing member is provided in the first sound-absorbing unit; The second muffler unit includes at least two expansion chambers, and corresponding air holes are provided between adjacent expansion chambers to form a gas bending flow channel; The gas enters from the first muffler unit and passes through the sound absorbing component, then enters the expansion chambers at each level and is discharged from the shell through the gas bending flow channel.

2. The sound-absorbing structure according to claim 1, characterized in that: The at least two-stage expansion chamber includes a primary expansion chamber and at least one secondary expansion chamber that are connected in sequence, and the at least one secondary expansion chamber is at least arranged at the end of the primary expansion chamber.

3. The sound-absorbing structure according to claim 2, characterized in that: The first muffler unit includes a first expansion chamber; The first-level expansion chamber includes a second expansion chamber and a third expansion chamber that are connected in sequence, and the second expansion chamber is connected to the first expansion chamber; The secondary expansion chambers include two, and the two secondary expansion chambers are symmetrically arranged on both sides of the third expansion chamber.

4. The sound-absorbing structure according to claim 3, characterized in that: One of the secondary expansion chambers includes a fourth expansion chamber and a fifth expansion chamber that are sequentially connected, the fourth expansion chamber is connected to the third expansion chamber, and the fifth expansion chamber is provided with an air outlet; Another second muffler unit includes a sixth expansion chamber and a seventh expansion chamber that are connected in sequence, the sixth expansion chamber is connected to the third expansion chamber, and the seventh expansion chamber is provided with an air outlet.

5. The sound-absorbing structure according to claim 4, characterized in that: The air outlet comprises a plurality of exhaust holes arranged in a matrix or an annular arrangement; The sound absorbing member is a porous sound absorbing material or a sound absorbing structure.

6. An oxygen concentrator, characterized in that: include: The sound-absorbing structure according to any one of claims 1 to 5; A molecular sieve is provided with a nitrogen exhaust port, and the nitrogen exhaust port is connected to the first muffler unit.

7. The oxygen concentrator according to claim 6, characterized in that The oxygen concentrator further includes a compressor cabin and a base, wherein the compressor cabin is arranged on the top of the base; A sealed installation cavity and a first opening and a second opening communicating with the installation cavity are provided in the compressor compartment. The muffler structure is provided in the compressor compartment, and an air outlet of the muffler structure communicates with the installation cavity. The first opening is used for air intake, and the installation cavity is connected to the base through the second opening for exhaust.

8. The oxygen concentrator according to claim 7, characterized in that A pipeline structure is provided outside the compressor compartment, one end of the pipeline structure is used for air intake, and the other end is connected to the installation cavity through the first opening; An exhaust component is also provided in the pipeline structure, and the exhaust component is arranged at the first opening.

9. The oxygen concentrator according to claim 7, characterized in that: The molecular sieve is arranged on the outer side wall of the compressor compartment, and the sound-absorbing structure is arranged on the inner side wall of the compressor compartment and close to the molecular sieve.

10. The oxygen concentrator according to claim 7, characterized in that: The oxygen concentrator further comprises a compressor and a muffler compartment, wherein the compressor shock absorber is arranged in the compressor compartment; The air outlet of the compressor is connected to the air inlet of the molecular sieve through a pipeline; The muffler compartment is arranged on the compressor compartment, and the air inlet end of the compressor is connected to the outside through the muffler compartment.

Images