Mute air cover structure and micro air pump

Abstract

The utility model relates to the technical field of air pumps, in particular to a mute air cover structure and a micro air pump. The exhaust valve comprises an exhaust seat, a silencing part, a one-way valve and a valve seat, and by optimizing the layout and the connection mode of all the parts, effective control over a gas flowing path is achieved, and noise is remarkably reduced. Specifically, the exhaust seat is fixedly connected with the valve seat to form an exhaust cavity and an air outlet cavity; the one-way valve is mounted on the valve seat to ensure one-way gas circulation; the silencing piece is installed on the valve seat, and noise generated in the working process is further reduced. In addition, the structure supports multiple types of one-way valves, and different numbers of air supply cavities and silencing pieces can be selected according to actual requirements, so that the optimal noise reduction effect is achieved. According to the air pump, the effects of effectively reducing the noise generated in the operation process of the air pump and improving the user experience are achieved.

Description

Technical Field

[0001] This application relates to the technical field of air pumps, and in particular to a silent air cover structure and a miniature air pump. Background Technology

[0002] Air pumps, as common fluid delivery devices, are widely used in various fields such as homes and healthcare. Especially in the application of miniature air pumps, their compact size makes them suitable for small medical devices such as blood pressure monitors and eye massagers, as well as various small household appliances, greatly improving the user experience. However, with the increasing demand for low-noise devices, reducing the noise level of air pumps during operation has become an important technical challenge.

[0003] To address this challenge, existing air pumps typically add sound-absorbing materials such as sound-dampening cotton to the exhaust end to absorb noise, or add a sound-insulating layer to the air pump casing to reduce noise propagation. This means the noise reduction only applies to the exhaust outlet. However, air pumps generate noise from more than just the exhaust outlet, so the noise reduction effect is limited. Utility Model Content

[0004] In order to improve the noise reduction effect of the silent air cover structure in areas other than the exhaust end outlet, the purpose of this application is to provide a silent air cover structure and a miniature air pump.

[0005] The silent air cover structure and miniature air pump provided in this application adopt the following technical solution:

[0006] A silent gas cover structure includes an exhaust seat, a silencer, a one-way valve, and a valve seat. The exhaust seat and the valve seat are fixedly connected. The exhaust seat and / or the valve seat are provided with an exhaust chamber. An exhaust chamber is formed between the exhaust seat and the valve seat. The exhaust chamber and the exhaust chamber are in communication. The one-way valve is installed on the valve seat. The valve seat is provided with an air supply chamber that is restricted to one-way communication with the exhaust chamber by the one-way valve. The silencer is installed on the valve seat. An silencer chamber is formed between the silencer and the valve seat. The air supply chamber has an opening for communicating with the exhaust chamber. The opening of the air supply chamber is located inside the silencer chamber.

[0007] By adopting the above technical solution, during operation, gas enters the air supply chamber, causing the gas pressure inside the air supply chamber to be greater than the gas pressure inside the exhaust chamber. The one-way valve, under pressure, undergoes elastic deformation to open the opening of the air supply chamber. At this time, gas can enter the exhaust chamber through the air supply chamber and finally be discharged through the exhaust chamber. When gas stops entering the air supply chamber, the gas pressure inside the air supply chamber decreases, causing the one-way valve to rebound against the pressure. At this time, the opening of the air supply chamber is closed by the one-way valve, preventing gas in the exhaust chamber from flowing back into the air supply chamber, thus achieving one-way air supply.

[0008] After entering the exhaust chamber, the gas undergoes multiple reversals due to the limited airflow design. Each reversal generates vibration with the base of the exhaust seat or valve seat, thus producing noise. The high velocity and relatively concentrated flow of gas immediately following the intake chamber contribute to the significant noise at the connection between the exhaust and intake chambers. The muffler design allows the gas from the intake chamber to first enter the muffler chamber, where it is then silenced before entering the exhaust chamber, significantly reducing noise at the connection point. Therefore, the silent gas cover structure of this application effectively reduces noise in areas other than the exhaust outlet, thereby improving the noise reduction effect of the silent gas cover structure.

[0009] Optionally, there are multiple air supply chambers, each air supply chamber is equipped with a one-way valve, and there is at least one silencer, with at least one air supply chamber connected to the silencer chamber of each silencer.

[0010] By adopting the above technical solution, the number of air supply chambers is matched with the number of cylinders. Each air supply chamber is equipped with a one-way valve, ensuring independent control of each channel, preventing gas backflow, and further improving the reliability and safety of the silent gas cover structure. Simultaneously, the silencer chamber of each silencer component is connected to the corresponding air supply chamber, allowing the gas to undergo silencer treatment before entering the exhaust chamber, significantly reducing noise at the connection between the air supply and exhaust chambers, and improving the overall quietness of the silent gas cover structure.

[0011] Optionally, the check valve can be an umbrella valve or a duckbill valve.

[0012] By adopting the above technical solutions, the one-way valve uses an umbrella valve or a duckbill valve, which can more effectively control the unidirectional flow of gas and avoid noise and performance degradation caused by gas backflow. The design of the umbrella valve or duckbill valve makes the valve more stable during opening and closing, reduces the impact noise caused by rapid valve opening and closing, and further improves the quietness of the silent gas cover structure.

[0013] Optionally, when the check valve is a duckbill valve, a fixing groove is provided on the side of the exhaust seat facing the valve seat, and the silencer is installed in the fixing groove.

[0014] By adopting the above technical solution, during production, the muffler is first installed in the fixing groove, and then the exhaust seat is fixedly connected to the valve seat with the duckbill valve installed. At this time, the end of the muffler facing the valve seat is pressed against the duckbill valve, thereby playing a role in fixing the duckbill valve. This ensures the noise reduction effect while facilitating the production and assembly of the silent air cover structure.

[0015] Optionally, there are multiple air delivery chambers, one check valve, and a fixed part and multiple valve heads. The fixed part is installed on the valve seat, and the multiple valve heads are arranged around the fixed part. The number of air delivery chambers is the same, and one valve head is configured accordingly. There is one silencer, and all air delivery chambers are connected to the silencer chamber of the silencer.

[0016] By adopting the above technical solution, the number of air supply chambers is matched with the number of cylinders. The openings of all air supply chambers are controlled by a one-way valve to simplify the structure of the silent air cover assembly and facilitate production and assembly.

[0017] Optionally, the valve seat has a mounting groove on the side facing the exhaust seat, and the silencer is installed in the mounting groove.

[0018] By adopting the above technical solution, a mounting groove is provided on the side of the valve seat facing the exhaust seat, and the muffler is installed in the mounting groove. This design allows the muffler to be more firmly fixed on the exhaust seat, avoiding loosening caused by vibration during use, thereby ensuring the stability and reliability of the air cover structure and reducing additional noise caused by the vibration of the muffler.

[0019] Optionally, the mounting groove is arranged in a ring shape, and the opening of the air delivery chamber is located inside the ring of the mounting groove.

[0020] By adopting the above technical solution, the annular mounting groove can better fix the muffler, thereby ensuring the stability of the muffler effect. At the same time, the opening of the air supply chamber is located inside the ring of the mounting groove, which can effectively prevent external impurities from entering the muffler chamber, further improving the working reliability and service life of the muffler.

[0021] Optionally, a pressing platform is provided on the side of the exhaust seat facing the valve seat, and the pressing platform presses against the silencer.

[0022] By adopting the above technical solution, the design of the clamping platform can ensure that the muffler is firmly clamped between the exhaust seat and the valve seat during installation, thereby ensuring the stability and reliability of the muffler and further improving the noise reduction effect of the silent air cover structure.

[0023] A miniature air pump, comprising any one of the above-mentioned silent air cover structures.

[0024] By adopting the above technical solution, and by optimizing the silent air cover structure to reduce noise in areas other than the exhaust end outlet, the miniature air pump of this application can effectively improve the noise reduction effect.

[0025] Optionally, it also includes an air supply structure, which includes a drive motor, a base, an eccentric wheel, a rocker arm, a cylinder, and a cylinder seat. The base is installed at the output end of the drive motor, and the output shaft of the drive motor extends into the base. The eccentric wheel is installed on the output shaft of the drive motor. The rocker arm is installed on the eccentric wheel and connected to the cylinder. The cylinder seat is installed on the base and fixedly connected to the valve seat. The cylinder is installed on the cylinder seat.

[0026] By adopting the above technical solution, the drive motor rotates the eccentric wheel, which in turn drives the cylinder to reciprocate via a rocker arm, thus achieving gas intake and exhaust. The cylinder's motion is transmitted to the valve seat through the cylinder seat, ensuring that the gas accurately enters the air supply chamber and then passes through the one-way valve into the exhaust chamber. This air supply structure not only ensures the stability and efficiency of gas flow but also seamlessly integrates with the silent air cover structure, further enhancing the overall quietness of the miniature air pump.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] 1. By setting a silencer between the air supply chamber and the exhaust chamber, the gas passes through the silencer before entering the exhaust chamber, which significantly reduces the noise at the connection between the exhaust chamber and the air supply chamber. By effectively reducing noise in the area of ​​the silent air cover structure except for the exhaust end outlet, the noise reduction effect of the air cover structure is improved.

[0029] 2. The valve seat has a mounting groove on the side facing the exhaust seat. The muffler is installed in the mounting groove. This design allows the muffler to be more firmly fixed on the exhaust seat, avoiding loosening caused by vibration during use. This ensures the stability and reliability of the air cover structure and reduces additional noise caused by the vibration of the muffler. Attached Figure Description

[0030] Figure 1 This is a cross-sectional structural diagram of Embodiment 1 of this application;

[0031] Figure 2 This is a cross-sectional view of the silent air cover structure according to Embodiment 1 of this application;

[0032] Figure 3 This is an exploded structural diagram of the silent air cover structure in Embodiment 1 of this application when the number of air delivery chambers is 2;

[0033] Figure 4 This is an exploded structural diagram of the silent air cover structure in Embodiment 1 of this application when the number of air delivery chambers is 3;

[0034] Figure 5 This is a cross-sectional view of the silent air cover structure of Embodiment 2 of this application;

[0035] Figure 6 This is a cross-sectional structural diagram of connection method ① in Embodiment 3 of this application;

[0036] Figure 7 This is a cross-sectional view of connection method ② in Embodiment 3 of this application;

[0037] Figure 8 This is a cross-sectional view of the silent air cover structure of Embodiment 4 of this application;

[0038] Figure 9 This is a cross-sectional structural schematic diagram of the silent air cover structure of Embodiment 5 of this application.

[0039] In the diagram: 1. Silent air cover structure; 11. Exhaust seat; 111. Pressing table; 112. Fixing groove; 12. Silencing component; 121. Plate part; 122. Ring part; 13. One-way valve; 131. Umbrella head; 132. Umbrella handle; 133. Fixing part; 134. Valve head; 135. Mounting part; 136. Duckbill part; 14. Valve seat; 141. Air supply chamber; 142. Mounting groove; 143. Fixing column; 15. Exhaust chamber; 16. Silencing chamber; 2. Air supply structure; 21. Drive motor; 22. Base; 23. Eccentric wheel; 24. Rocker arm; 25. Cylinder; 26. Cylinder seat. Detailed Implementation

[0040] The following is in conjunction with the appendix Figure 1-9 This application will be described in further detail below.

[0041] This application discloses a miniature air pump, including a silent air cover structure 1 and an air delivery structure 2. The core design feature of this application lies in the silent air cover structure 1. By optimizing the silent air cover structure 1, noise reduction is effectively achieved in areas other than the exhaust outlet, thereby improving the noise reduction effect of the miniature air pump. Although the medium described in the application is gas, liquid can also be used as a medium in actual use, although the effect and lifespan of using a fluid medium are relatively inferior to using gas. Therefore, using liquid as a medium is also within the scope of protection of this application.

[0042] It should be noted that the air delivery structure 2 is common knowledge known to those skilled in the art. Therefore, in order to ensure the completeness of the description of the micro air pump solution, the air delivery structure 2 in this application embodiment is only one solution. The air delivery structure 2 can also be replaced by related structures such as those disclosed in CN117547667A, CN218934675U, or CN111980893A.

[0043] Example 1:

[0044] Reference Figure 1 and Figure 2A miniature air pump includes a silent air cover structure 1 and an air delivery structure 2. The air delivery structure 2 is used to generate driving force to drive the gas flow within the silent air cover structure 1, thereby realizing gas delivery.

[0045] Reference Figure 2 and Figure 3 The silent gas cover structure 1 includes an exhaust seat 11, a silencer 12, a one-way valve 13, and a valve seat 14, with the exhaust seat 11 and the valve seat 14 fixedly connected. The exhaust seat 11 and / or the valve seat 14 are provided with an exhaust chamber. In this embodiment, the exhaust chamber is located on the valve seat 14. The exhaust chamber can be formed by an exhaust pipe integrally molded into the valve seat 14, and the exhaust pipe can be used to connect gas containers such as gas bags, depending on the actual application scenario.

[0046] The exhaust seat 11 is fixedly connected to the valve seat 14, and the connection method can be ultrasonic welding, snap-fit ​​connection, or screw connection. An exhaust chamber 15 is formed between the exhaust seat 11 and the valve seat 14, and the exhaust chamber communicates with the exhaust chamber 15. The exhaust chamber 15 can be entirely located in the exhaust seat 11, entirely located in the valve seat 14, or partially located in the exhaust seat 11 and partially in the valve seat 14.

[0047] Reference Figure 2 and Figure 3 One-way valve 13 is installed on valve seat 14. Valve seat 14 is provided with air supply chamber 141 that is restricted by one-way valve 13 to unidirectional communication with exhaust chamber 15. There can be multiple air supply chambers 141, such as two or three (e.g., Figure 4 There can be four or five air supply holes, depending on the actual design requirements and adapted to the air supply structure 2. The air supply chamber 141 has an opening for connecting to the exhaust chamber 15; that is, the opening of the air supply chamber 141 is located on the side of the air supply chamber 141 facing the exhaust chamber 15. A one-way valve 13 is used to open and close the opening of the air supply chamber 141 to limit the flow of gas within the air supply chamber 141 to the direction of the exhaust chamber 15. Each air supply chamber 141 can be a single air supply hole or a combination of multiple air supply holes.

[0048] In this first embodiment, the one-way valve 13 is an umbrella valve, and there are at least two umbrella valves. Each umbrella valve has an umbrella head 131 and an umbrella handle 132. The umbrella handle 132 passes through the valve seat 14 so that the one-way valve 13 can be fixed on the valve seat 14. The umbrella head 131 is located on the side of the valve seat 14 facing the exhaust seat 11 to open and close the opening of the air delivery chamber 141. The openings of the air delivery chamber 141 that cooperate with the umbrella valve are all located within the range of the umbrella head 131.

[0049] Reference Figure 2 and Figure 3 The silencing component 12 is a hard sintered component with countless tiny pores inside. This hard sintered component can be a PE sintered filter element, a bronze sintered filter element, or a stainless steel filter element, etc.

[0050] A silencer 12 is mounted on a valve seat 14, forming a silencer cavity 16 between the silencer 12 and the valve seat 14. The opening of the air supply cavity 141 connects to the exhaust cavity 15 via the silencer cavity 16. The silencer 12 is cylindrical, with a recessed hole structure on one end face. Therefore, the silencer 12 is divided into a plate portion 121 and a ring portion 122, with the exhaust cavity 15 located within the ring portion 122. The silencer 12 covers a one-way valve 13, so that the one-way valve 13 is located within the corresponding silencer cavity 16 and opens and closes the opening of the air supply cavity 141 within the corresponding silencer cavity 16.

[0051] In this first embodiment, the number and position of the silencers 12 correspond one-to-one with the number and position of the one-way valves 13. That is, each air delivery chamber 141 is equipped with one one-way valve 13, the number of silencers 12 is the same as the number of air delivery chambers 141, and each silencer 12 has a corresponding silencer chamber 16 connected to one air delivery chamber 141. In other embodiments, the number of silencers 12 may be less than the number of one-way valves 13. Each silencer 12 has at least one air delivery chamber 141 connected to its silencer chamber 16 as needed by design, and the one-way valves 13 corresponding to the number of air delivery chambers 141 are located in the corresponding silencer 12.

[0052] The valve seat 14 is provided with a mounting groove 142 around the outer ring of the umbrella head 131 of each one-way valve 13. The ring portion 122 of the silencer 12 is installed in the mounting groove 142 by embedding, so that the umbrella head 131 of the one-way valve 13 is completely located in the silencer cavity 16.

[0053] To improve the installation stability of the muffler 12, in addition to allowing an interference fit between the muffler 12 and the mounting groove 142, a clamping platform 111 can be provided on the side of the exhaust seat 11 facing the valve seat 14, with one clamping platform 111 for each muffler 12. When the valve seat 14 is fixedly connected to the exhaust seat 11, the clamping platform 111 presses against the muffler 12, that is, the clamping platform 111 applies pressure to the muffler 12 towards the mounting groove 142 to make the muffler 12 more stably installed in the mounting groove 142.

[0054] Reference Figure 1 The air delivery structure 2 includes a drive motor 21, a base 22, an eccentric wheel 23, a rocker arm 24, a cylinder 25, and a cylinder seat 26. The base 22 is mounted on the output end of the drive motor 21, and the output shaft of the drive motor 21 extends into the base 22. The eccentric wheel 23 is mounted on the output shaft of the drive motor 21. The rocker arm 24 is mounted on the eccentric wheel 23 and connected to the cylinder 25. The cylinder seat 26 is mounted on the base 22 and fixedly connected to the valve seat 14. The cylinder 25 is mounted on the cylinder seat 26. The cylinder 25 has multiple air bladders, the number of which is the same as the number of air delivery chambers 141, and their positions correspond one-to-one.

[0055] The principles of the air supply structure 2 and the flow of gas are common knowledge familiar to those skilled in the art, and will not be elaborated upon here.

[0056] The implementation principle of a miniature air pump according to Embodiment 1 of this application is as follows:

[0057] ① During operation, the drive motor 21 is energized to rotate its output shaft, which in turn drives the eccentric wheel 23 to rotate. The eccentric wheel 23 drives the rocker arm 24 to swing periodically, causing the air bladder of the cylinder 25 to periodically deliver air. When the air bladder compression volume decreases, gas enters the air delivery chamber 141, increasing the air pressure inside the air delivery chamber 141. At this time, the air pressure inside the air delivery chamber 141 is greater than the air pressure inside the silencer chamber 16. The one-way valve 13 undergoes elastic deformation under pressure to open the opening of the air delivery chamber 141. Gas can then enter the exhaust chamber 15 through the air delivery chamber 141 and the silencer chamber 16, and finally be discharged through the exhaust chamber.

[0058] ② When the machine stops working, the drive motor 21 is de-energized so that its output shaft stops rotating. The eccentric wheel 23, the rocker arm 24 and the cylinder 25 all stop working. The gas stops entering the air delivery chamber 141 so that the air pressure in the air delivery chamber 141 decreases. At this time, the one-way valve 13 rebounds against the pressure. At this time, the opening of the air delivery chamber 141 is closed by the one-way valve 13. The gas in the exhaust chamber 15 cannot flow back into the air delivery chamber 141, thereby realizing one-way air delivery.

[0059] Example 2:

[0060] The difference between this embodiment 2 and embodiment 1 lies in the silent air cover structure 1, mainly in: ① the structure of the silencer 12 ② the structure of the mounting groove 142 on the valve seat 14.

[0061] Reference Figure 5 In this second embodiment, the number of sound-absorbing components 12 is one, and the number of mounting slots 142 is also only one. Instead of surrounding the umbrella head 131, all umbrella heads 131 are included in the mounting slots.

[0062] All the openings of the air supply chambers 141 are connected to the silencer chamber 16 of the silencer 12, and the umbrella heads 131 of all the one-way valves 13 are located in the silencer chamber 16 of the silencer 12 to cooperate with the openings of the corresponding air supply chambers 141.

[0063] The implementation principle of this second embodiment is the same as that of the first embodiment.

[0064] Example 3:

[0065] The difference between this embodiment 3 and embodiment 2 lies in the silent gas cover structure 1, mainly in: ① the structure of the one-way valve 13 ② the structure of the valve seat 14 adapted to the one-way valve 13.

[0066] Reference Figure 6 and Figure 7In this third embodiment, there is one check valve 13. The check valve 13 includes a fixed part 133 and multiple valve heads 134. The multiple valve heads 134 are arranged around the fixed part 133. The number of air delivery chambers 141 is the same, and one valve head 134 is configured accordingly.

[0067] The fixing part 133 of the one-way valve 13 is fixedly connected to the valve seat 14, and the connection method includes, but is not limited to:

[0068] ① (e.g.) Figure 6 The one-way valve 13 is embedded in the mounting groove 142 of the valve seat 14, at which time the ring portion 122 of the silencer 12 presses against the edge area of ​​the fixing portion 133 of the one-way valve 13.

[0069] ② (e.g.) Figure 7 A boss is added to the edge of the fixing part 133 of the one-way valve 13. The boss is embedded in the mounting groove 142 of the valve seat 14. At this time, the ring part 122 of the silencer 12 presses against the area where the boss is located on the fixing part 133 of the one-way valve 13.

[0070] ③ A fixing post 143 is provided on the valve seat 14, and the fixing part 133 of the one-way valve 13 has an opening for the fixing post 143 to be inserted.

[0071] The implementation principle of this third embodiment is the same as that of the first embodiment.

[0072] Example 4:

[0073] The difference between this embodiment four and embodiment one lies in the silent gas cover structure 1, mainly in: ① the structure of the one-way valve 13 ② the position of the mounting groove 142 ③ the installation method of the one-way valve 13.

[0074] Reference Figure 8 In this third embodiment, the one-way valve 13 is a duckbill valve, having a mounting portion 135 and a duckbill portion 136. The duckbill portion 136 has a large end and a small end, and the mounting portion 135 is arranged around the large end of the duckbill portion 136. A one-way airflow chamber is formed inside the duckbill portion 136.

[0075] The mounting groove 142 adapted to the duckbill valve is arranged around the air supply chamber 141. The mounting part 135 of the duckbill valve is installed into the mounting groove 142. At this time, the opening of the air supply chamber 141 is connected to the one-way airflow chamber of the duckbill part 136 so that the opening and closing can be realized through the duckbill part 136.

[0076] When the muffler 12 is installed, the ring portion 122 of the muffler 12 presses on the mounting portion 135 of the duckbill valve, and the pressure plate 111 facing the exhaust seat 11 presses against the muffler 12, thereby achieving stable installation of the muffler 12 and the duckbill valve.

[0077] The implementation principle of this fourth embodiment is the same as that of the first embodiment.

[0078] Example 5:

[0079] The difference between this embodiment 5 and embodiment 3 lies in the silent gas cover structure 1, mainly in: ① the structure of the silencer 12 ② the structure of the valve seat 14 for matching the silencer 12 with the exhaust seat 11.

[0080] Reference Figure 9 In this third embodiment, the structure of the muffler 12 can retain only the ring portion 122. In this case, a fixing groove 112 is provided on the side of the exhaust seat 11 facing the valve seat 14. One end of the ring portion 122 of the muffler 12 is installed in the fixing groove 112, and the other end is installed in the mounting groove 142. The connection between the ring portion 122 of the muffler 12 and the fixing groove 112 can be achieved by snap-fit, or it can be placed inside the mold during injection molding of the exhaust seat 11.

[0081] In other embodiments, the one-way valve 13 can be replaced with an umbrella valve, and the valve seat 14 is used for structural adaptation adjustments to install the umbrella valve.

[0082] The implementation principle of this fifth embodiment is the same as that of the first embodiment.

[0083] The embodiments described herein are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings, while the terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be included within the scope of protection of this application.

Claims

1. A silent air cover structure (1), characterized in that, It includes an exhaust seat (11), a muffler (12), a one-way valve (13), and a valve seat (14). The exhaust seat (11) is fixedly connected to the valve seat (14). The exhaust seat (11) and / or the valve seat (14) are provided with an exhaust chamber. An exhaust chamber (15) is formed between the exhaust seat (11) and the valve seat (14). The exhaust chamber is connected to the exhaust chamber (15). The one-way valve (13) is installed on the valve seat (14), and the valve seat (14) is provided with an air supply chamber (141) that is restricted by the one-way valve (13) to communicate unidirectionally with the exhaust chamber (15). The muffler (12) is installed on the valve seat (14), and a muffler chamber (16) is formed between the muffler (12) and the valve seat (14). The air supply chamber (141) has an opening for communicating with the exhaust chamber (15), and the opening of the air supply chamber (141) is located inside the muffler chamber (16).

2. The silent air cover structure (1) according to claim 1, characterized in that, There are multiple air delivery chambers (141), each air delivery chamber (141) is equipped with one of the one-way valves (13), and there is at least one silencer (12), with at least one air delivery chamber (141) correspondingly connected in the silencer chamber (16) of each silencer (12).

3. The silent air cover structure (1) according to claim 2, characterized in that, The one-way valve (13) is an umbrella valve or a duckbill valve.

4. The silent air cover structure (1) according to claim 3, characterized in that, When the one-way valve (13) is a duckbill valve, the exhaust seat (11) facing the valve seat (14) is provided with a fixing groove (112), and the silencer (12) is installed in the fixing groove (112).

5. The silent air cover structure (1) according to claim 1, characterized in that, There are multiple air delivery chambers (141), and one check valve (13). The check valve (13) includes a fixing part (133) and multiple valve heads (134). The fixing part (133) is installed on the valve seat (14), and multiple valve heads (134) are arranged around the fixing part (133). The number of air delivery chambers (141) is the same, and one valve head (134) is configured accordingly. There is one silencer (12), and all air delivery chambers (141) are connected to the silencer chamber (16) of the silencer (12).

6. The silent air cover structure (1) according to claim 1, characterized in that, The valve seat (14) has a mounting groove (142) on the side facing the exhaust seat (11), and the muffler (12) is installed in the mounting groove (142).

7. A silent air cover structure (1) according to claim 6, characterized in that, The mounting groove (142) is arranged in a ring shape, and the opening of the air delivery chamber (141) is located inside the ring of the mounting groove (142).

8. A silent air cover structure (1) according to claim 6, characterized in that, The exhaust seat (11) is provided with a pressing platform (111) on the side facing the valve seat (14), and the pressing platform (111) presses against the silencer (12).

9. A miniature air pump, characterized in that, Includes the silent air cover structure (1) as described in any one of claims 1-8.

10. A miniature air pump according to claim 9, characterized in that, It also includes an air supply structure (2), which includes a drive motor (21), a base (22), an eccentric wheel (23), a rocker arm (24), a cylinder (25), and a cylinder seat (26). The base (22) is installed at the output end of the drive motor (21), and the output shaft of the drive motor (21) extends into the base (22). The eccentric wheel (23) is installed on the output shaft of the drive motor (21). The rocker arm (24) is installed on the eccentric wheel (23) and connected to the cylinder (25). The cylinder seat (26) is installed on the base (22) and fixedly connected to the valve seat (14). The cylinder (25) is installed on the cylinder seat (26).

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