Exhaust silencer of oxygen generator

Abstract

The invention relates to the technical field of oxygen preparation equipment, in particular to an oxygen generator exhaust silencer, which comprises a shell, and an air inlet pipe and an air outlet pipe connected with the shell, and also comprises a silencing inner pipe which can be pushed to move relative to a silencing outer pipe when the air pressure reaches a fixed value when the device is used for silencing, and the silencing inner pipe can be pushed to move relative to the silencing outer pipe. Meanwhile, the silencing holes in the silencing inner pipe are leaked to balance the air pressure in the silencing outer pipe, so that the effect of automatically adjusting the number of the silencing holes according to the difference of the amount of air exhausted by the oxygen generator is achieved, and the situation that when the air pressure in the exhaust silencer is increased, the flow speed of airflow passing through the silencing holes is increased, and the noise is reduced is avoided as much as possible. Meanwhile, the device adopts the design of resetting by taking the self gravity of the silencing inner pipe as power, so that the air pressure in a cavity formed by the silencing outer pipe and the silencing inner pipe tends to be stable when the silencing inner pipe moves, and the flow speed of the air flow passing through the silencing holes is ensured to be consistent as much as possible; and therefore, a perfect silencing state is always realized.

Description

Technical Field

[0001] The invention relates to the technical field of oxygen preparation equipment, in particular to an exhaust muffler for an oxygen generator. Background Art

[0002] Oxygen generators use air separation technology, molecular sieve adsorption, and oil-free compressors as power to separate nitrogen from oxygen to produce high-concentration oxygen. It produces oxygen quickly and at high concentrations, and is suitable for oxygen therapy and health care for all groups of people. It is energy-saving and efficient, but the existing mechanical valve separation will produce a large instantaneous noise (usually more than 60 decibels) when discharging nitrogen, causing discomfort. Therefore, existing oxygen generator exhaust pipes are generally equipped with silencers, such as the porous diffusion silencer in the prior art, which is designed based on the principle that after the steam volume passes through the porous diffusion, the velocity and stagnation pressure will be reduced. After the gas diffuses through the porous structure, the pressure decreases, the flow rate is diffused and reduced, and the intensity of the radiated noise is correspondingly weakened. However, in the actual use of the existing exhaust venting silencer, the exhaust airflow flow rate in the exhaust pipe of the oxygen generator is not fixed, and the silencer hole is often designed with a specific size. Therefore, when the exhaust flow in the pipe exceeds the design standard of the exhaust venting silencer, the air pressure in the exhaust silencer increases, and the airflow velocity through the silencer hole increases, making the silencing effect of the airflow worse. For this reason, we propose an oxygen generator exhaust silencer. Summary of the invention

[0003] A technical problem to be solved by the present application is: how to design a silencer which can automatically adjust the number of silencer holes.

[0004] In order to solve the above technical problems, the embodiment of the present application provides an oxygen concentrator exhaust muffler, including a shell and an air inlet pipe and an air outlet pipe connected to the shell, and also includes: The outer silencer pipe is fixedly connected in the outer shell and is in communication with the air intake pipe, and the outer silencer pipe is provided with multiple layers of silencer holes evenly spaced at equal intervals; The silencer inner tube is slidably connected in the silencer outer tube, and a silencer hole is also opened on the silencer inner tube. The outer shell is designed to be placed vertically. The air pressure in the silencer outer tube increases to push the silencer inner tube to overcome its own gravity and move relative to the silencer outer tube to leak out of the silencer hole thereon. The limit assembly is arranged on the silencer outer tube and connected to the silencer inner tube. The silencer holes on the silencer inner tube adopt a multi-layer design to limit the moving distance of the silencer inner tube to an integral multiple of the distance between two adjacent layers of silencer holes.

[0005] In some embodiments, the limiting assembly includes a plurality of annular grooves equidistantly and evenly arranged on the silencer inner tube, the plurality of annular grooves corresponding one-to-one to the multi-layer silencer holes, a bayonet is slidably connected to the silencer outer tube, one end of the bayonet is located in the annular groove and adopts an arc-shaped design, which is used to temporarily lock the silencer inner tube, and a spring is fixedly connected between one end of the bayonet and the silencer outer tube.

[0006] In some embodiments, sound-absorbing cotton is fixedly connected to the inner wall of the shell.

[0007] In some embodiments, the silencer holes on the silencer inner tube are designed in a spiral arrangement, and a spiral portion is fixedly connected to the end of the silencer outer tube to cover the silencer holes. A rotating part is provided in the silencer outer tube, and air pressure drives the silencer inner tube to move, and the rotating part is used to drive the silencer inner tube to rotate.

[0008] In some embodiments, the rotating member includes a mounting frame fixedly connected to the outer shell, a hollow column fixedly connected to the mounting frame, a round rod body fixedly connected to the top of the silencer inner tube, one end of the round rod body slides through the hollow column, and a spiral groove is provided on the round rod body, a cylindrical convex having one end located in the spiral groove is fixedly connected to the hollow column, and when the silencer inner tube is moved, the hollow column is driven to move, thereby driving the cylindrical convex to slide along the spiral groove, so that the silencer inner tube rotates.

[0009] In some embodiments, a fan is rotatably connected in the air intake pipe, a second shaft is rotatably connected on the mounting frame 1, and a transmission member is disposed in the housing, the fan is connected to the second shaft via the transmission member, the air intake pipe circulates gas to drive the fan to rotate, and the transmission member drives the second shaft to rotate; A piston plate is slidably connected in the silencer inner tube, and a docking assembly connected to the piston plate is arranged in the outer shell. The air pressure in the silencer inner tube increases to push the piston plate to move, and the docking assembly is used to connect the second shaft and the round rod body.

[0010] In some embodiments, the transmission member includes a mounting frame 2 fixedly connected in the air intake pipe, and a shaft 3 is rotatably connected to the mounting frame 2, and the shaft 3 is fixed to the fan, and one end of the shaft 2 is fixedly connected to a synchronous pulley, and one end of the shaft 3 is also fixedly connected to a synchronous pulley. The two synchronous pulleys are connected by a synchronous belt, and rotating the fan drives the shaft 2 to rotate.

[0011] In some embodiments, the docking assembly includes a guide rod fixedly connected to one side of the movable plate, one end of the guide rod slides through the silencer inner tube, and the round rod body adopts a hollow design, one side of the piston plate is fixedly connected to an axis four, one end of the axis four passes through the round rod body, a mounting plate is provided in the housing, one end of the round rod body passes through the mounting plate and is rotatably connected thereto, and one end of the axis two slides through the mounting plate; A toothed disc 1 is fixedly connected to one end of the shaft 4, a hollow shaft 5 is rotatably connected to the mounting plate, a toothed disc 2 is fixedly connected to the hollow shaft 5, and a sliding protrusion is fixedly connected inside the hollow shaft 5, the shaft 2 passes through the hollow shaft 5, a sliding groove is provided on the shaft 2, one end of the sliding protrusion is located in the sliding groove for guiding and limiting the sliding of the hollow shaft 5, and the air pressure in the silencer inner tube increases to push the piston plate to move, so as to drive the toothed disc 1 to engage with the toothed disc 2.

[0012] In some embodiments, a tension spring is sleeved on one end of the guide rod, and both ends of the tension spring are respectively fixed to the guide rod and the silencer inner tube, and a toothed disc three is fixedly connected to the hollow shaft five, and a toothed disc four meshing with the toothed disc three is rotatably connected to the mounting plate via a rotating shaft, and in the initial state of the tension spring, the toothed disc one is meshed with the toothed disc four, and the air pressure in the silencer inner tube increases to push the piston plate to move, while the tension spring is stretched to provide it with self-restoring elastic force.

[0013] In some embodiments, the diameter of the third toothed disc is smaller than that of the second toothed disc.

[0014] The present invention has at least the following beneficial effects: When the device is silencing, when the gas discharged by the oxygen generator increases, the air pressure in the inner silencer tube will increase, and then when the air pressure reaches a fixed value, the inner silencer tube will be pushed to move relative to the outer silencer tube, and at the same time, the silencer holes on the inner silencer tube will leak out to balance the air pressure in the outer silencer tube, thereby achieving the effect of automatically adjusting the number of silencer holes according to the amount of gas discharged by the oxygen generator, thereby avoiding as much as possible the problem that when the air pressure in the exhaust silencer increases, the flow rate of the airflow through the silencer holes will increase, making the silencing effect of the airflow worse.

[0015] The device adopts a design that uses the gravity of the silencer inner tube itself as the power for resetting, ensuring that the air pressure in the cavity formed by the silencer outer tube and the silencer inner tube tends to be stable when the silencer inner tube moves, thereby ensuring that the air flow rate through the silencer hole is always consistent as much as possible to always achieve a perfect silencer state.

[0016] The device temporarily fixes the moved silencer inner pipe by cooperating with the annular groove and the bayonet pin, thereby avoiding the silencer hole being in a semi-leaking state as much as possible, thereby reducing its silencer effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present invention; Figure 2 For the present invention Figure 1 Schematic diagram of the local cross-section structure; Figure 3 For the present invention Figure 2 Schematic diagram of the local cross-section structure; Figure 4 For the present invention Figure 3Schematic diagram of the structure of the middle A area; Figure 5 This is a schematic diagram of the structure of Embodiment 2 of the present invention; Figure 6 For the present invention Figure 5 Schematic diagram of the local cross-section structure; Figure 7 This is a schematic diagram of the structure of Embodiment 3 of the present invention; Figure 8 For the present invention Figure 7 Schematic diagram of the local cross-section structure; Fig. 9 For the present invention Figure 8 Schematic diagram of the structure of the middle B area; Fig.10 For the present invention Figure 8 Schematic diagram of the partial cross-section structure.

[0018] In the figure: 1-housing; 11-inlet pipe; 12-exhaust pipe; 2-silencer outer pipe; 3-silencer hole; 4-silencer inner pipe; 5-limiting assembly; 41-annular groove; 42-pin; 43-spring one; 44-silence cotton; 45-spiral portion; 46-rotating member; 47-mounting frame one; 48-hollow column; 49-round rod body; 51-spiral groove; 52-cylindrical convex; 53-fan; 54-axle two; 55-transmission member; 56-piston plate; 57-docking assembly; 58-mounting frame two; 59-axle three; 61-synchronous pulley; 62-guide rod; 64-axle four; 65-mounting plate; 66-toothed disc one; 67-hollow shaft five; 68-toothed disc two; 69-sliding convex; 71-sliding groove; 72-tension spring; 73-toothed disc three; 74-toothed disc four. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] Example 1: Please refer to Figure 1-Figure 4 The present invention provides a technical solution: an oxygen concentrator exhaust muffler, comprising a housing 1, an air inlet pipe 11 and an air outlet pipe 12 fixed and conductively connected to the housing 1, and also comprising: The silencer outer tube 2 is fixedly connected in the outer shell 1 and is in conduction connection with the air inlet pipe 11, and the silencer outer tube 2 is evenly and evenly provided with multiple layers of silencer holes 3; The silencer inner tube 4 is slidably connected in the silencer outer tube 2, and the silencer inner tube 4 is also provided with a silencer hole 3. The outer shell 1 is designed to be placed vertically, and the silencer inner tube 4 is designed with a light material to reduce its own gravity. The air pressure in the silencer outer tube 2 increases to push the silencer inner tube 4 to overcome its own gravity and move relative to the silencer outer tube 2 to leak out of the silencer hole 3 thereon; A limit assembly 5, which is arranged on the silencer outer tube 2 and connected to the silencer inner tube 4, and is used to limit the movement distance of the silencer inner tube 4 to an integer multiple of the distance between two adjacent layers of silencer holes 3; Specifically, when the device is silencing, when the gas discharged by the oxygen generator increases, the air pressure in the silencer inner tube 4 will increase, and then when the air pressure reaches a fixed value, the silencer inner tube 4 will be pushed to move relative to the silencer outer tube 2, and at the same time, the silencer holes 3 on the silencer inner tube 4 will leak out to balance the air pressure in the silencer outer tube 2, so as to achieve the effect of automatically adjusting the number of silencer holes 3 according to the different amount of gas discharged by the oxygen generator, thereby avoiding as much as possible that when the air pressure in the exhaust muffler increases, the air flow velocity through the silencer holes 3 will increase, which will cause the The problem of the deterioration of the silencing effect of the airflow is solved. At the same time, the device adopts a design that uses the gravity of the silencer inner tube 4 itself as the power to reset, ensuring that the air pressure in the cavity composed of the silencer outer tube 2 and the silencer inner tube 4 tends to be stable when the silencer inner tube 4 moves, thereby ensuring that the air flow rate through the silencer hole 3 is always consistent, so as to always be close to the perfect silencing state. At the same time, the moved silencer inner tube 4 is temporarily fixed by the cooperation of the annular groove 41 and the bayonet pin 42, so as to avoid the silencer hole 3 being in a semi-leaking state as much as possible, thereby reducing its silencing effect.

[0021] The silencer hole 3 on the silencer inner tube 4 adopts a multi-layer design, and the limiting component 5 includes a plurality of annular grooves 41 equidistantly and evenly arranged on the silencer inner tube 4, and the plurality of annular grooves 41 correspond one to one to the multi-layer silencer holes 3. A bayonet pin 42 is slidably connected to the silencer outer tube 2, and one end of the bayonet pin 42 is located in the annular groove 41 and adopts an arc-shaped design, which is used to temporarily lock the silencer inner tube 4. A spring 43 is fixedly connected between one end of the bayonet pin 42 and the silencer outer tube 2. During specific use, when the thrust generated by the air pressure in the cavity formed by the silencer outer tube 2 and the silencer inner tube 4 is greater than the gravity of the silencer inner tube 4 and the friction force between the silencer outer tube 2 and the silencer inner tube 4 and the fixing force of the bayonet pin 42, the silencer inner tube 4 moves out until the bayonet pin 42 is re-engaged in another annular groove 41.

[0022] A sound-absorbing cotton 44 is fixedly connected to the inner wall of the housing 1 to assist in sound reduction and improve the sound reduction effect of the device body.

[0023] Example 2: Please refer to Figure 1-Figure 6 The present invention provides a technical solution: Example 2 is another specific opening method of the silencer hole 3 on the silencer inner tube 4 in Example 1, and an implementation method of a specific structure derived from this opening method; The silencer holes 3 on the silencer inner tube 4 are designed with a spiral arrangement, and a spiral portion 45 is fixedly connected to the end of the silencer outer tube 2 to cover the silencer holes 3. A rotating member 46 is provided in the silencer outer tube 2. The air pressure pushes the silencer inner tube 4 to move, and the rotating member 46 is used to drive the silencer inner tube 4 to rotate. Specifically, when the air pressure pushes the silencer inner tube 4 to extend out of the silencer outer tube 2, the silencer inner tube 4 moves while rotating, so that the silencer holes 3 on the silencer inner tube 4 leak out one by one, thereby avoiding the silencer holes 3 from being in a semi-leaking state as much as possible, thereby reducing its silencer effect.

[0024] The rotating member 46 includes a mounting frame 47 fixedly connected to the inner wall of the outer shell 1, a hollow column 48 fixedly connected to the mounting frame 47, a round rod body 49 fixedly connected to the top of the silencer inner tube 4, one end of the round rod body 49 slides through the hollow column 48, and a spiral groove 51 is provided on the round rod body 49, a cylindrical protrusion 52 with one end located in the spiral groove 51 is fixedly connected in the hollow column 48, and the cylindrical protrusion 52 is slidably connected to the inner wall of the spiral groove 51, and when the silencer inner tube 4 is moved, the hollow column 48 is driven to move, so as to drive the cylindrical protrusion 52 to slide along the spiral groove 51, so that the silencer inner tube 4 rotates.

[0025] Example 3: Please refer to Figure 1-Figure 10 , the present invention provides a technical solution: Example 3 is optimized on the basis of Example 2; A fan 53 is rotatably connected in the air inlet pipe 11, a second shaft 54 ​​is rotatably connected on the mounting frame 1 47, and a transmission member 55 is provided in the housing 1, the fan 53 and the second shaft 54 ​​are connected through the transmission member 55, the air inlet pipe 11 flows to drive the fan 53 to rotate, and the transmission member 55 drives the second shaft 54 ​​to rotate; A piston plate 56 is slidably connected in the silencer inner tube 4, and a docking assembly 57 connected to the piston plate 56 is provided in the outer shell 1. The air pressure in the silencer inner tube 4 increases to push the piston plate 56 to move, and the docking assembly 57 is used to connect the shaft 2 54 and the round rod body 49.

[0026] The transmission member 55 includes a mounting frame 2 58 fixedly connected to the intake pipe 11, and a shaft 3 59 is rotatably connected to the mounting frame 2 58 through a bearing. The shaft 3 59 is fixedly connected to the fan 53, and a synchronous pulley 61 is fixedly connected to one end of the shaft 2 54, and a synchronous pulley 61 is also fixedly connected to one end of the shaft 3 59. The two synchronous pulleys 61 are connected by a synchronous belt. The gas drives the fan 53 to rotate, and then drives the shaft 3 59 to rotate, which facilitates the synchronous pulley 61 to cooperate with the synchronous belt to drive the shaft 2 54 to rotate.

[0027] The docking assembly 57 includes a guide rod 62 fixedly connected to one side of the movable plate, one end of the guide rod 62 slides through the silencer inner tube 4, and the round rod body 49 adopts a hollow design, a shaft 4 64 is fixedly connected to one side of the piston plate 56, one end of the shaft 4 64 slides through the round rod body 49, a mounting plate 65 is arranged in the housing 1, one end of the round rod body 49 passes through the mounting plate 65 and is rotatably connected to the mounting plate 65 through a bearing, and one end of the shaft 2 54 slides through the mounting plate 65, and the movable round rod body 49 drives the mounting plate 65 to move; A toothed disc 1 66 is fixedly connected to one end of shaft 4 64, a hollow shaft 5 67 is rotatably connected to the mounting plate 65 through a bearing, a toothed disc 2 68 is fixedly connected to the hollow shaft 5 67, and a sliding protrusion 69 is fixedly connected inside the hollow shaft 5 67, shaft 2 54 passes through the hollow shaft 5 67, a sliding groove 71 is provided on shaft 2 54, one end of the sliding protrusion 69 is located in the sliding groove 71 and is slidably connected to the inner wall of the sliding groove, which is used to guide and limit the sliding of the hollow shaft 5 67, and the air pressure in the silencer inner tube 4 increases to push the piston plate 56 to move, so as to drive the toothed disc 1 66 to engage with the toothed disc 2 68, and at this time, the rotation of the fan 53 drives the toothed disc 2 68 to rotate, and then drives the toothed disc 1 66 to rotate, thereby driving the piston plate 56 and the silencer inner tube 4 to rotate.

[0028] A tension spring 72 is sleeved on one end of the guide rod 62, and the two ends of the tension spring 72 are fixedly connected to the guide rod 62 and the silencer inner tube 4 respectively, and a toothed disc 3 73 is fixedly connected to the hollow shaft 5 67, and a toothed disc 4 74 meshing with the toothed disc 3 73 is rotatably connected to the mounting plate 65 through a rotating shaft. In the initial state of the tension spring 72, the toothed disc 1 66 is meshed with the toothed disc 4 74, and the air pressure in the silencer inner tube 4 increases to push the piston plate 56 to move, and at the same time, the tension spring 72 is stretched to provide it with a self-restoring elastic force; In specific use, when the amount of gas discharged by the oxygen generator is small, the air pressure in the cavity formed by the silencer outer tube 2 and the silencer inner tube 4 is also small, so that the piston plate 56 can only be pushed to move a certain distance relative to the silencer inner tube 4, and at the same time, the tension spring 72 is stretched and the gear plate 1 66 is driven to move through the shaft 4 64, so that the gear plate 1 66 is located between the gear plate 2 68 and the gear plate 4 74. In this case, the rotation of the fan 53 will not drive the silencer inner tube 4 to move. When the amount of gas discharged by the oxygen generator increases, the air pressure in the cavity formed by the silencer outer tube 2 and the silencer inner tube 4 increases, thereby pushing the piston plate 56 to move a certain distance. The fan 53 rotates to drive the shaft 2 54 to rotate, thereby driving the hollow shaft 5 67 to rotate, thereby driving the toothed disc 2 68 to rotate, thereby driving the toothed disc 1 66 and the shaft 4 64 to rotate, thereby driving the round rod 49 to rotate, thereby driving the silencer inner tube 4 to rotate and move at the same time to leak out the silencer hole 3 to balance the pressure. On the contrary, when the air pressure in the cavity formed by the silencer outer tube 2 and the silencer inner tube 4 decreases, the piston plate 56 uses the tension spring 72 to reset to drive the toothed disc 1 66 to mesh with the toothed disc 4 74, thereby driving the silencer inner tube 4 to retract to cover the silencer hole 3.

[0029] Tooth disc three 73 is designed with a diameter smaller than that of tooth disc two 68, because when the air pressure in the cavity formed by the silencer outer tube 2 and the silencer inner tube 4 increases, the movement of the silencer inner tube 4 can be driven not only by the fan 53, but also by the air pressure. When the air pressure in the cavity formed by the silencer outer tube 2 and the silencer inner tube 4 decreases from large to small, although the air pressure decreases from large to small, there is still air pressure. At this time, when the silencer inner tube 4 is retracted, the air pressure not only fails to promote it, but also forms resistance. Then, the driving force can be increased by the smaller diameter driving tooth disc three 73, thereby making the device run more smoothly.

[0030] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0031] While the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that many changes, modifications, substitutions and variations can be made to the embodiments without departing from the principles and spirit of the invention.

Claims

1. An oxygen concentrator exhaust silencer, comprising a housing (1) and an air inlet pipe (11) and an air outlet pipe (12) connected to the housing (1), characterized in that: Also included are: The silencer outer tube (2) is fixedly connected in the outer shell (1) and is conductively connected to the air intake pipe (11), and the silencer outer tube (2) is provided with multiple layers of silencer holes (3) at even intervals; The silencer inner tube (4) is slidably connected in the silencer outer tube (2), and the silencer inner tube (4) is also provided with a silencer hole (3), and the outer shell (1) is designed to be placed vertically, and the air pressure in the silencer outer tube (2) increases to push the silencer inner tube (4) to overcome its own gravity and move relative to the silencer outer tube (2) to leak out of the silencer hole (3) thereon; The limit assembly (5) is arranged on the silencer outer tube (2) and connected to the silencer inner tube (4), and the silencer holes (3) on the silencer inner tube (4) adopt a multi-layer design, so as to limit the movement distance of the silencer inner tube (4) to an integer multiple of the distance between two adjacent layers of silencer holes (3).

2. The oxygen concentrator exhaust muffler according to claim 1, characterized in that: The limit assembly (5) comprises a plurality of annular grooves (41) uniformly and equidistantly provided on the silencer inner tube (4), the plurality of annular grooves (41) corresponding one to one with the multi-layer silencer holes (3), a bayonet (42) slidably connected to the silencer outer tube (2), one end of the bayonet (42) being located in the annular groove (41) and adopting an arc-shaped design, and being used for temporarily locking the silencer inner tube (4), and a spring (43) being fixedly connected between one end of the bayonet (42) and the silencer outer tube (2).

3. The oxygen concentrator exhaust muffler according to claim 2, characterized in that: A sound-proofing cotton (44) is fixedly connected to the inner wall of the outer shell (1).

4. The oxygen concentrator exhaust muffler according to claim 1, characterized in that: The silencer holes (3) on the silencer inner tube (4) are designed in a spiral arrangement, and a spiral portion (45) is fixedly connected to the end of the silencer outer tube (2) for shielding the silencer holes (3). A rotating member (46) is provided in the silencer outer tube (2), and air pressure pushes the silencer inner tube (4) to move, while the rotating member (46) is used to drive the silencer inner tube (4) to rotate.

5. The oxygen concentrator exhaust muffler according to claim 4, characterized in that: The rotating member (46) comprises a mounting frame (47) fixedly connected to the outer shell (1), a hollow column (48) fixedly connected to the mounting frame (47), a round rod (49) fixedly connected to the top end of the silencer inner tube (4), one end of the round rod (49) slidingly passing through the hollow column (48), and a spiral groove (51) is formed on the round rod (49), and a cylindrical protrusion (52) with one end located in the spiral groove (51) is fixedly connected to the hollow column (48), and when the silencer inner tube (4) is moved, the hollow column (48) is driven to move, thereby driving the cylindrical protrusion (52) to slide along the spiral groove (51), so that the silencer inner tube (4) rotates.

6. The oxygen concentrator exhaust muffler according to claim 5, characterized in that: A fan (53) is rotatably connected in the air intake pipe (11), a second shaft (54) is rotatably connected on the mounting frame (47), and a transmission member (55) is provided in the housing (1), the fan (53) and the second shaft (54) are connected via the transmission member (55), the air intake pipe (11) circulates gas to drive the fan (53) to rotate, and the transmission member (55) drives the second shaft (54) to rotate; A piston plate (56) is slidably connected in the silencer inner tube (4), and a docking assembly (57) connected to the piston plate (56) is provided in the outer shell (1). The air pressure in the silencer inner tube (4) increases to push the piston plate (56) to move, and the docking assembly (57) is used to connect the second shaft (54) and the round rod body (49).

7. The oxygen concentrator exhaust muffler according to claim 6, characterized in that: The transmission member (55) comprises a second mounting frame (58) fixedly connected to the air intake pipe (11); a third shaft (59) is rotatably connected to the second mounting frame (58); the third shaft (59) is fixed to the fan (53); one end of the second shaft (54) is fixedly connected to a synchronous pulley (61); one end of the third shaft (59) is also fixedly connected to a synchronous pulley (61); the two synchronous pulleys (61) are connected via a synchronous belt; rotating the fan (53) drives the second shaft (54) to rotate.

8. The oxygen concentrator exhaust muffler according to claim 7, characterized in that: The docking assembly (57) comprises a guide rod (62) fixedly connected to one side of the movable plate, one end of the guide rod (62) slides through the silencer inner tube (4), and the round rod body (49) adopts a hollow design, one side of the piston plate (56) is fixedly connected to a fourth shaft (64), one end of the fourth shaft (64) passes through the round rod body (49), a mounting plate (65) is arranged in the housing (1), one end of the round rod body (49) passes through the mounting plate (65) and is rotatably connected thereto, and one end of the second shaft (54) slides through the mounting plate (65); A toothed disc 1 (66) is fixedly connected to one end of the shaft 4 (64), a hollow shaft 5 (67) is rotatably connected to the mounting plate (65), a toothed disc 2 (68) is fixedly connected to the hollow shaft 5 (67), and a sliding protrusion (69) is fixedly connected inside the hollow shaft 5 (67), the shaft 2 (54) passes through the hollow shaft 5 (67), a sliding groove (71) is provided on the shaft 2 (54), one end of the sliding protrusion (69) is located in the sliding groove (71) for guiding and limiting the sliding of the hollow shaft 5 (67), and the air pressure of the silencer inner tube (4) increases to push the piston plate (56) to move, so as to drive the toothed disc 1 (66) to engage with the toothed disc 2 (68).

9. The oxygen concentrator exhaust muffler according to claim 8, characterized in that: A tension spring (72) is sleeved on one end of the guide rod (62), and the two ends of the tension spring (72) are respectively fixed to the guide rod (62) and the silencer inner tube (4), and a toothed disc three (73) is fixedly connected to the hollow shaft five (67), and a toothed disc four (74) meshing with the toothed disc three (73) is rotatably connected to the mounting plate (65) via a rotating shaft. In the initial state of the tension spring (72), the toothed disc one (66) is meshed with the toothed disc four (74), and the air pressure in the silencer inner tube (4) increases to push the piston plate (56) to move, while the tension spring (72) is stretched to provide a self-restoring elastic force for it.

10. The oxygen concentrator exhaust muffler according to claim 9, characterized in that: The toothed disc three (73) is designed to have a smaller diameter than the toothed disc two (68).

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