Noise reduction air pump device and automobile seat pneumatic system

Abstract

The invention provides a noise reduction air pump device and an automobile seat pneumatic system, and relates to the technical field of automobile parts, the noise reduction air pump device comprises an air pump shell, an air inlet, an air outlet and a noise reduction device, the noise reduction air pipe structure is of a multi-layer hollow structure, and air flow channels formed by the noise reduction air pipe structure comprise at least one air outlet channel and at least one air inlet channel; one end of the air outlet channel is communicated with the air outlet, and the other end is communicated with the air-using component; one end of the air inlet channel communicates with the space between the air pump body and the air pump shell, and the other end of the air inlet channel communicates with an air source. When the air pump device is in a working state, air of the air source firstly enters the air pump shell through the air inlet channel, then enters the air pump main body through the air inlet of the air pump main body, and finally is fed into an air using component through the air outlet and the air outlet channel. Dual performance improvement of noise reduction and airflow optimization is achieved, and the noise control and power output capacity of an automobile seat pneumatic system is effectively improved.

Description

Technical Field

[0001] The present application generally relates to the technical field of vehicle components, and more particularly to a noise-reducing air pump device and a car seat pneumatic system. Background Art

[0002] The air pump in a car seat's pneumatic system serves as the core power source for functions like pneumatic massage and airbag support. Its noise control and airflow stability directly impact the passenger experience. Existing car seat air pumps generally face two major technical bottlenecks: First, the air pump's air inlet is typically directly connected to a single-walled smooth air tube. This type of air tube is made of unsupported flexible material (such as ordinary rubber tubing), with a smooth outer surface and soft walls. During dynamic seat adjustment, it can be easily bent and deformed due to squeezing, leading to frequent sudden changes in the cross-sectional area of ​​the airflow channel. This not only causes fluctuations in gas flow, but also generates significant turbulent noise due to friction between the airflow and the smooth tube wall, seriously impacting ride comfort. Second, the air intake path within the air pump housing is designed to be short (typically less than 10 cm), allowing airflow to enter the air pump cavity without effective buffering. This results in the superposition of the air pump's own vibration noise and the airflow pulse noise, which is then transmitted into the cabin through the housing structure. Especially in models with higher requirements for quietness, such as new energy vehicles, the noise problem of traditional air pump systems is further amplified. The measured increase in cabin noise can reach 10-15dB(A), which is significantly different from the automotive NVH (noise, vibration and harshness) design standards.

[0003] Currently, some solutions offer passive noise reduction by wrapping the air tube with sound-insulating foam or installing an independent soundproofing cover around the air pump. However, these approaches not only increase system weight and cost, but also restrict the flexibility of airbag layout due to the additional structure occupying interior seat space. Therefore, we propose a noise-reducing air pump device and automotive seat pneumatic system to address these issues. Summary of the Invention

[0004] In view of the above-mentioned defects or deficiencies in the prior art, it is desired to provide a noise-reducing air pump device and a car seat pneumatic system that reduce noise inside the car, improve the air intake and exhaust volume and the driving experience.

[0005] In a first aspect, the present application provides a noise-reducing air pump device, comprising: An air pump housing, wherein an air pump body is disposed inside the air pump housing, and the air pump body has an air inlet and an air outlet; A noise reduction air pipe structure, wherein the noise reduction air pipe structure is a multi-layer hollow structure, wherein at least one air flow passage formed therein is an air outlet passage, and at least one air flow passage formed therein is an air inlet passage; one end of the air outlet passage is connected to the air outlet, and the other end is used to communicate with the air-using component; one end of the air inlet passage is connected to the space between the air pump body and the air pump housing, and the other end is used to communicate with the air source; When the air pump device is in working state, the gas from the air source first enters the interior of the air pump housing through the air inlet channel, then enters the air pump body through the air inlet of the air pump body, and finally is sent into the air-using component through the air outlet and the air outlet channel.

[0006] According to the technical solution provided in the embodiment of the present application, a fixed sealing sleeve is provided on the outer wall of the noise reduction air pipe structure, and the fixed sealing sleeve is located at the connection position between the air pump housing and the noise reduction air pipe structure.

[0007] According to the technical solution provided in the embodiment of the present application, the fixed sealing sleeve is sponge or rubber.

[0008] According to the technical solution provided in the embodiment of the present application, the noise reduction airway structure includes: At least two layers of nested and concentrically arranged tube walls, with multiple local hollow wall structures provided between at least one group of adjacent tube walls, the extension direction of the local hollow wall structures being the same as the extension direction of the noise reduction airway structure; The tube wall in the inner layer forms the air outlet channel, and the local hollow wall structure forms the air inlet channel.

[0009] According to the technical solution provided in the embodiment of the present application, the total cross-sectional area of ​​all the local hollow wall structures is 15%-50% of the total cross-sectional area of ​​all the tube walls on the same section.

[0010] According to the technical solution provided in the embodiment of the present application, when the number of the tube walls is more than two layers and the local empty wall structure is provided between at least two groups of adjacent tube walls, the local empty wall structures in different groups are staggered, and the end portion of at least one group of the local empty wall structures intersects with the longitudinal section of at least another group of the local empty wall structures along the radial extension line of the noise reduction airway structure.

[0011] According to the technical solution provided in the embodiment of the present application, when the number of the tube walls is two or more and the local empty wall structures are provided between at least two groups of adjacent tube walls, the local empty wall structures in different groups are aligned and arranged.

[0012] According to the technical solution provided in the embodiment of the present application, the outer wall of the noise reduction airway structure is provided with a plurality of tooth-like structures, and the tooth-like structures are distributed circumferentially along the outer wall of the noise reduction airway structure.

[0013] According to the technical solution provided in the embodiment of the present application, an auxiliary air inlet is provided on the air pump housing, and the auxiliary air inlet is communicated with the space between the air pump body and the air pump housing.

[0014] In a second aspect, the present application provides a car seat pneumatic system, comprising: the above-mentioned noise reduction air pump device.

[0015] It can be seen from the above technical solution that this application has at least the following beneficial effects: The present application provides a noise-reducing air pump device, comprising: an air pump housing, an air pump body is arranged inside the air pump housing, and the air pump body has an air inlet and an air outlet; a noise-reducing air pipe structure, the noise-reducing air pipe structure is a multi-layer hollow structure, at least one air flow passage formed by it is an air outlet passage, and at least one air flow passage formed by it is an air inlet passage; one end of the air outlet passage is connected to the air outlet, and the other end is used to be connected to the air-using component; one end of the air inlet passage is connected to the space between the air pump body and the air pump housing, and the other end is used to be connected to the air source; when the air pump device is in working state, the gas of the air source enters the interior of the air pump housing through the air inlet passage, then enters the air pump body through the air inlet of the air pump body, and finally is sent to the air-using component through the air outlet and the air outlet passage.

[0016] On the one hand, the present application forms an airflow path through the multi-layer hollow structure of the noise-reducing air duct structure, wherein at least one airflow path is an outlet channel and at least one airflow path is an inlet channel. The layered layout of the inlet channel and the inner layer outlet channel extends the inlet path from the traditional direct connection to the air pump body to a tortuous path of "air source, inlet channel, space between the air pump body and the air pump housing, and air inlet of the air pump body." This extends the airflow path, increases the gas buffer time, reduces the airflow pulse frequency, and utilizes the internal space of the air pump housing to stabilize the airflow, reducing the vibration noise caused by the airflow directly impacting the air pump body. On the other hand, the multi-layer hollow structure allows noise to pass through different media (tube wall, air) during propagation, reducing its vibration frequency, thereby achieving the purpose of reducing noise and improving the driving experience. In addition, the extended inlet path allows the gas entering the air pump body per unit time to be fully diffused during the flow process, avoiding flow fluctuations caused by sudden changes in the cross-sectional area of ​​the airflow channel, thereby improving the stability of the effective air intake volume, ultimately achieving the dual performance improvements of noise reduction and airflow optimization, effectively improving the noise control and power output capabilities of the automotive seat pneumatic system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Other features, objects and advantages of the present application will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings.

[0018] Figure 1 Schematic diagram of the structure of the air pump device for noise reduction.

[0019] Figure 2 A cross-sectional view of an air pump device for noise reduction.

[0020] Figure 3 A schematic diagram of the structure of a noise-reducing air pump device using a fixed sealing sleeve.

[0021] Figure 4A cross-sectional view of a noise-reducing air pump device using a fixed sealing sleeve.

[0022] Figure 5 for Figure 4 Enlarged view of part A.

[0023] Figure 6 A side view of a noise-reducing air pump device using a fixed sealing sleeve.

[0024] Figure 7 This is a cross-sectional view of the first noise reduction air pipe structure with a toothed structure.

[0025] Figure 8 Schematic diagram of the structure of the three-layer pipe wall.

[0026] Figure 9 This is a cross-sectional view of a structure in which local hollow walls are arranged on both layers of the tube wall.

[0027] Figure 10 This is a schematic diagram of the first structure in which the local empty wall structure is a strip-shaped hole.

[0028] Figure 11 Schematic diagram of the second structure in which the local empty wall structure is a strip-shaped hole.

[0029] Figure 12 Schematic diagram of the structure in which the local hollow wall structure is a circular hole.

[0030] Figure 13 Schematic diagram of the structure when local void wall structures are densely distributed.

[0031] Figure 14 This is a cross-sectional view of a second noise reduction air pipe structure with a tooth-like structure.

[0032] Figure 15 It is a cross-sectional view of an air pump device with an auxiliary air inlet.

[0033] Figure 16 A side view of an air pump device with an auxiliary air inlet.

[0034] Figure 17 for Figure 15 Magnified view of part B.

[0035] Numbers in the figure: 1. Air pump housing; 2. Air pump body; 3. Air inlet; 4. Air outlet; 5. Noise reduction air pipe structure; 6. Air outlet channel; 7. Air inlet channel; 8. Fixed sealing sleeve; 9. Pipe wall; 10. Partial hollow wall structure; 11. Toothed structure; 12. Auxiliary air inlet. DETAILED DESCRIPTION

[0036] The present application will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the relevant invention and are not intended to limit the invention. It should also be noted that, for ease of description, only portions relevant to the invention are shown in the accompanying drawings.

[0037] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0038] like Figure 1 、 Figure 3 and Figure 6 As shown, the present application provides a noise-reducing air pump device, comprising: An air pump housing 1 is provided with an air pump body 2 inside the air pump housing 1, and the air pump body 2 has an air inlet 3 and an air outlet 4; The noise reduction air pipe structure 5 is a multi-layer hollow structure. At least one air flow passage formed therein is an air outlet passage 6, and at least one air flow passage formed therein is an air inlet passage 7. One end of the air outlet passage 6 is connected to the air outlet 4, and the other end is used to communicate with the air-using component. One end of the air inlet passage 7 is connected to the space between the air pump body 2 and the air pump housing 1, and the other end is used to communicate with the air source. When the air pump device is in working state, the gas from the air source first enters the interior of the air pump housing 1 through the air inlet channel 7, then enters the air pump main body 2 through the air inlet 3 of the air pump main body 2, and finally is sent to the gas-using components through the air outlet 4 and the air outlet channel 6.

[0039] It should be noted that if Figure 2 As shown, the air pump housing 1 serves as the external support structure of the air pump device. Its interior houses the air pump body 2 and provides a buffer space for the air intake path. The air pump body 2 is the core power component of the air pump device, achieving gas intake and exhaust through mechanical movement. The space between the air pump housing 1 and the air pump body 2 communicates with the air intake channel 7 of the noise reduction air pipe structure 5, forming the air intake path.

[0040] The air inlet 3 of the air pump body 2 is connected to the space between the air pump housing 1 and the air pump body 2, receiving the gas transported through the air inlet channel 7. The air outlet 4 of the air pump body 2 is connected to the air outlet channel 6 of the noise reduction air pipe structure 5, outputting the compressed gas to the gas-using components.

[0041] The noise reduction air pipe structure 5 is a multi-layer hollow structure, at least one air flow path formed by it is an air outlet channel 6, and at least one air flow path formed by it is an air inlet channel 7. Figure 2As shown, the noise reduction air pipe structure 5 is a double-layer hollow structure, the inner layer of which forms an air outlet channel 6. The air outlet channel 6 is connected to the air outlet 4 of the air pump body 2, and the other end leads to the air-using component, which is, for example, a car seat airbag, and is used to transport the high-pressure gas discharged from the air pump body 2 to provide power for the air-using component. Figure 2 The outer layer of the noise reduction air pipe structure 5 forms an air intake channel 7, one end of the air intake channel 7 is connected to the air source, such as the outside air, and the other end is connected to the space between the air pump housing 1 and the air pump body 2, which is used to guide the outside gas into the inside of the air pump housing 1 and provide an air intake source for the air pump body 2.

[0042] Currently, the intake end of conventional air pumps is directly connected to a single-walled air pipe, resulting in a short airflow path, typically less than 10 cm, which is prone to pulse noise and vibration caused by airflow impact. In the present application, by connecting the intake channel 7 in series with the housing gap (the space between the air pump body 2 and the air pump housing 1), the intake path is significantly extended, providing more time for gas to buffer during flow, reducing the frequency of airflow pulses—that is, the number of airflow impacts per unit time—and thus reducing noise. Furthermore, before entering the air pump body 2, the gas diffuses within the housing gap, reducing the flow rate and making the distribution more uniform. This avoids turbulent noise caused by high-speed airflow directly impacting the air pump body intake. Furthermore, the multi-layer hollow structure allows noise to propagate through different media (the pipe wall, air), reducing its vibration frequency, thereby achieving the goal of reducing noise and improving the driving experience. In addition, the extended air intake path allows the gas entering the air pump body 2 per unit time to be fully diffused during the flow process, avoiding flow fluctuations caused by sudden changes in the cross-sectional area of ​​the air flow channel, thereby improving the stability of the effective air intake volume, and ultimately achieving the dual performance improvements of noise reduction and airflow optimization, effectively improving the noise control and power output capabilities of the car seat pneumatic system.

[0043] Further, if Figure 4 and Figure 5 As shown, a fixed sealing sleeve 8 is provided on the outer wall of the noise reduction air pipe structure 5 and is located at the connection position between the air pump housing 1 and the noise reduction air pipe structure 5 .

[0044] During operation, the air pump body 2 generates mechanical vibrations, which are transmitted outward through the connection interface between the air pump housing 1 and the noise-reducing air pipe structure 5. This vibration may cause the housing to resonate or the noise-reducing air pipe structure 5 to vibrate, exacerbating the noise. Therefore, a fixed sealing sleeve 8 is designed at the connection between the air pump housing 1 and the noise-reducing air pipe structure 5. The fixed sealing sleeve 8 forms a flexible sealing layer that absorbs the vibration energy between the air pump housing 1 and the air pipe noise-reducing air pipe structure 5, thereby reducing the vibration transmission efficiency and reducing noise. Here, the type of the fixed sealing sleeve 8 is, for example, sponge or rubber.

[0045] Furthermore, the noise reduction air pipe structure 5 includes: At least two layers of nested and concentrically arranged tube walls 9, with multiple partially hollow wall structures 10 provided between at least one group of adjacent tube walls 9, and the extension direction of the partially hollow wall structures 10 being the same as the extension direction of the noise reduction air pipe structure 5; The inner tube wall 9 forms an air outlet channel 6 , and the local hollow wall structure 10 forms an air inlet channel 7 .

[0046] It should be noted that the interior of the noise reduction air pipe structure 5 is hollow for gas to pass through. The material of the noise reduction air pipe structure 5 is, for example, polyester, polyurethane, polyether, PVC, rubber plastic, polyethylene or silicone. The noise reduction air pipe structure 5 includes at least two layers of pipe wall 9, such as Figure 7 As shown, the noise reduction air pipe structure 5 is composed of two layers of pipe walls 9, which are nested and concentrically arranged. The two layers of pipe walls 9 can be an integrally formed structure, which makes the structure of the entire noise reduction air pipe structure 5 more stable. A plurality of local hollow wall structures 10 are provided between the two layers of pipe walls 9. When noise propagates along the pipe walls 9, since the local hollow wall structures 10 are hollow structures, the noise will pass through different media (pipe walls, air) during propagation, and its vibration frequency will be reduced, thereby achieving the purpose of reducing noise and improving the driving experience.

[0047] Here, the air outlet end of the air source and the end of the noise reduction air pipe structure 5 are connected through an air nozzle or a quick-plug structure. If the noise reduction air pipe structure 5 and the air nozzle or the quick-plug structure are connected by plugging, the end face of the noise reduction air pipe structure 5 will abut against the end face of the air nozzle or the quick-plug structure, sealing the local hollow wall structure 10 of the noise reduction air pipe structure 5, thereby improving the noise reduction performance; if welding is used for connection, the end face will melt, and the local hollow wall structure 10 can also be sealed, which can also improve the noise reduction performance.

[0048] Furthermore, when the number of tube walls 9 is two or more and a partial hollow wall structure 10 is provided between at least two groups of adjacent tube walls 9, the partial hollow wall structures 10 in different groups are staggered, and the end of at least one group of partial hollow wall structures 10 intersects the longitudinal section of at least another group of partial hollow wall structures 10 along the radial extension line of the noise reduction air pipe structure 5. Figure 8 As shown, the local hollow wall structure 10 on the outer layer can cover the position of the inner layer where the local hollow wall structure 10 is not set, which can better block the transmission of noise. Figure 9 As shown, there are three layers of tube walls 9, and the outermost and middle layers of tube walls 9 are respectively provided with a group of local hollow wall structures 10, and the two groups of local hollow wall structures 10 are staggered, which can also better block the transmission of noise.

[0049] Furthermore, when there are two or more layers of tube walls 9 and partial hollow wall structures 10 are provided between at least two groups of adjacent tube walls 9, the partial hollow wall structures 10 in different groups are aligned. That is, the center lines connecting the partial hollow wall structures 10 in the same position in adjacent groups intersect and are perpendicular to the central axis of the noise reduction air pipe structure 5, which can also better block the transmission of noise.

[0050] Furthermore, the local hollow wall structures 10 in the same group are evenly distributed or unevenly distributed.

[0051] Specifically, if Figure 10 、 Figure 11 and Figure 12 As shown, the local hollow wall structures 10 in the same group are evenly distributed, which can better block the transmission of noise.

[0052] When the local hollow wall structures 10 in the same group are unevenly distributed, the effect of blocking noise transmission can be enhanced.

[0053] Based on the above content, it can be seen that regardless of whether it is a uniform distribution or a non-uniform distribution, the local hollow wall structure 10 can be designed to be densely distributed or non-densely distributed, which can enhance the effect of the local hollow wall structure 10 in blocking noise transmission and improve the vehicle driving experience.

[0054] Furthermore, the cross section of the local hollow wall structure 10 is a regular shape or an irregular shape. Here, the regular shape is, for example: Figure 10 The bar shape shown or Figure 12 It should be noted that the specifications of the local hollow wall structure 10 are not limited, such as Figure 10 and Figure 11 As shown, the cross-sectional area of ​​the strip-shaped partially hollow wall structure 10 can be large or small, but it should be noted that the total cross-sectional area of ​​all partially hollow wall structures 10 is 15%-50% of the total cross-sectional area of ​​all tube walls 9 on the same section. This design not only provides the trachea body with good bending resistance, but also achieves the purpose of noise reduction.

[0055] Furthermore, a plurality of tooth-like structures 11 are provided on the outer wall of the noise reduction air pipe structure 5 , and the tooth-like structures 11 are distributed circumferentially along the outer wall of the noise reduction air pipe structure 5 .

[0056] Specifically, the tooth-like structure 11 supports the outer wall of the noise reduction air tube structure 5; under the action of the same bending force, the tooth-like structures 11 contact each other, thereby helping the noise reduction air tube structure 5 to bend less easily, so that there is a gap between the outer walls of the noise reduction air tube structure 5, thereby avoiding abnormal phenomena such as the noise reduction air tube structure 5 being bent, the gas flow being reduced due to bending, or the outer wall of the noise reduction air tube structure 5 rubbing against other structures inside the seat to produce abnormal noise, thereby enhancing the service life of the air tube and the driving experience.

[0057] like Figure 14 As shown, the inner wall of the noise-reducing air duct structure 5 can also be provided with multiple tooth-like structures 11, which are distributed circumferentially along the inner wall of the noise-reducing air duct structure 5. This can also help the noise-reducing air duct structure 5 to be less prone to bending, ensuring that there is always a gap inside the noise-reducing air duct structure 5. This prevents abnormal phenomena such as the noise-reducing air duct structure 5 being bent, the air flow being reduced due to bending, or the outer wall of the noise-reducing air duct structure 5 rubbing against other structures inside the seat, thereby enhancing the service life of the air duct and the driving experience. In addition, the tooth-like structures 11 provided inside the noise-reducing air duct structure 5 can also guide the airflow, making the turbulent airflow smooth and also play a noise reduction role.

[0058] In addition, the cross section of the tooth-like structure 11 is regular or irregular. Here, the regular shape is, for example, a cone, a trapezoid or a rectangle; the irregular shape is, for example, a wave shape.

[0059] The tooth-like structures 11 are continuous or intermittently distributed protrusions. Specifically, when the tooth-like structures 11 are continuously and evenly distributed along the outer wall of the noise-reduction air duct structure 5, the noise-reduction air duct structure 5 is not easily bent at any position. This ensures that no matter which direction or angle the noise-reduction air duct structure 5 is bent, there is always a certain gap between the outer walls of the noise-reduction air duct structure 5, thereby ensuring that the interior of the noise-reduction air duct structure 5 can always be ventilated, avoiding abnormal phenomena such as the noise-reduction air duct structure 5 being bent, the air flow being reduced due to bending, or the outer wall of the noise-reduction air duct structure 5 rubbing against other internal structures of the seat, causing abnormal noise.

[0060] When the tooth-like structures 11 are spaced and unevenly distributed along the outer wall of the noise reduction air pipe structure 5, the bending habits can be learned according to the actual application environment of the noise reduction air pipe structure 5. Figure 13 As shown, relatively dense tooth structures 11 are designed on both sides of the bending position, so that the noise reduction trachea structure 5 has a strong anti-bending ability, minimizing the probability of the trachea body 1 being bent.

[0061] like Figure 15 、 Figure 16 and Figure 17 As shown, an auxiliary air inlet 12 is provided on the air pump housing 1, and the auxiliary air inlet 12 is communicated with the space between the air pump body 2 and the air pump housing 1. The auxiliary air inlet 12 is used to assist in increasing the air intake of the air pump body 1, to avoid insufficient air intake of the air pump body 1 when the air intake of the air intake channel 7 is insufficient, thereby affecting the working efficiency and life of the air pump body 1.

[0062] The present application also provides a car seat pneumatic system, comprising: the above-mentioned noise reduction air pump device.

[0063] It should be noted that the air-using component is, for example, an air bag; the air source is, for example, an air pump; the car seat pneumatic system has the functions and advantages of the above-mentioned noise-reducing air pump device, which will not be described in detail here.

[0064] The above description is merely a preferred embodiment of the present application and an illustration of the technical principles employed. Those skilled in the art should understand that the scope of the invention herein is not limited to the technical solutions formed by the specific combination of the above-mentioned technical features, but also encompasses other technical solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the inventive concept. For example, a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features having similar functions disclosed in this application.

Claims

1. A noise-reducing air pump device, characterized in that: include: An air pump housing (1), wherein an air pump body (2) is provided inside the air pump housing (1), and the air pump body (2) has an air inlet (3) and an air outlet (4); A noise reduction air pipe structure (5), wherein the noise reduction air pipe structure (5) is a multi-layer hollow structure, wherein at least one air flow passage formed therein is an air outlet passage (6), and at least one air flow passage formed therein is an air inlet passage (7); one end of the air outlet passage (6) is connected to the air outlet (4), and the other end is used to be connected to an air-using component; one end of the air inlet passage (7) is connected to the space between the air pump body (2) and the air pump housing (1), and the other end is used to be connected to an air source; When the air pump device is in operation, the gas from the air source first enters the interior of the air pump housing (1) through the air inlet channel (7), then enters the air pump body (2) through the air inlet (3) of the air pump body (2), and finally is delivered to the air-using component through the air outlet (4) and the air outlet channel (6).

2. A noise-reducing air pump device according to claim 1, characterized in that: The outer wall of the noise reduction air pipe structure (5) is provided with a fixed sealing sleeve (8), and the fixed sealing sleeve (8) is located at the connection position between the air pump housing (1) and the noise reduction air pipe structure (5).

3. A noise-reducing air pump device according to claim 2, characterized in that: The fixed sealing sleeve (8) is sponge or rubber.

4. The noise-reducing air pump device according to claim 1, characterized in that: The noise reduction air pipe structure (5) comprises: At least two layers of nested and concentrically arranged tube walls (9), a plurality of local hollow wall structures (10) are provided between at least one group of adjacent tube walls (9), and the extension direction of the local hollow wall structures (10) is the same as the extension direction of the noise reduction air pipe structure (5); The tube wall (9) in the inner layer forms the air outlet channel (6), and the local hollow wall structure (10) forms the air inlet channel (7).

5. A noise-reducing air pump device according to claim 4, characterized in that: The total cross-sectional area of ​​all the local hollow wall structures (10) is 15%-50% of the total cross-sectional area of ​​all the tube walls (9) on the same section.

6. The noise-reducing air pump device according to claim 4, characterized in that: When the number of the tube walls (9) is two or more and the local hollow wall structures (10) are provided between at least two groups of adjacent tube walls (9), the local hollow wall structures (10) in different groups are staggered, and the ends of at least one group of the local hollow wall structures (10) intersect with the longitudinal section of at least another group of the local hollow wall structures (10) along the radial extension line of the noise reduction air pipe structure (5).

7. The noise-reducing air pump device according to claim 4, characterized in that: When the number of the tube walls (9) is two or more and the local hollow wall structures (10) are provided between at least two groups of adjacent tube walls (9), the local hollow wall structures (10) in different groups are aligned and arranged.

8. The noise-reducing air pump device according to claim 4, characterized in that: The outer wall of the noise reduction air pipe structure (5) is provided with a plurality of tooth-shaped structures (11), and the tooth-shaped structures (11) are distributed circumferentially along the outer wall of the noise reduction air pipe structure (5).

9. The noise-reducing air pump device according to claim 8, characterized in that: An auxiliary air inlet (12) is provided on the air pump housing (1), and the auxiliary air inlet (12) is communicated with the space between the air pump body (2) and the air pump housing (1).

10. A car seat pneumatic system, characterized in that: include: A noise-reducing air pump device according to any one of claims 1 to 9.

Images