Air pump device with sound absorbing structure

Abstract

This invention discloses an air pump device with a noise reduction structure, including a housing with an air inlet and an air outlet; a noise reduction mechanism disposed within the housing, comprising a flexible noise reduction channel and a guide and shaping assembly disposed at the bend of the flexible noise reduction channel, one end of the flexible noise reduction channel communicating with the air inlet; and a drive mechanism disposed within the housing for driving the other end of the flexible noise reduction channel to move axially according to airflow parameters; the guide and shaping assembly includes a movable seat slidably disposed along the axial direction of the flexible noise reduction channel, and two positioning rollers disposed on the movable seat and located on both sides of the flexible noise reduction channel. This invention achieves dual adaptive adjustment of the "curvature" and "diameter cross-section" of the noise reduction channel, balancing the requirements of high-efficiency noise reduction at low flow rates and low wind resistance at high flow rates.

Description

Technical Field

[0001] This invention relates to the field of air pump technology, and more particularly to an air pump device with a noise reduction structure. Background Technology

[0002] When an air pump or air pump operates at high speed, the impeller rotation cutting the airflow and the violent fluctuation of the airflow will generate strong aerodynamic noise. With people's increasing requirements for the comfort of the user environment and increasingly stringent noise pollution control regulations, the noise problem generated by the air pump during operation has become one of the key factors restricting the user experience and market competitiveness of the product. The market demand for low noise or even ultra-quiet air pumps is becoming increasingly urgent.

[0003] To control the intake noise of the air pump, a tortuous silencer channel is designed at the intake or exhaust port. By setting multiple bends, detours, or spiral flow channel structures within the airflow channel, the airflow undergoes multiple changes in direction and energy dissipation as it flows through these tortuous structures, thereby reducing the intensity of noise radiation. The noise reduction mechanism of the tortuous channel mainly includes: the local pressure loss caused by the sudden change in airflow direction at the bend, resulting in a reduction of sound energy; multiple reflections and scattering of sound waves by the channel wall, achieving sound wave attenuation; and the tortuous path increasing the propagation path of sound waves, enhancing the natural attenuation effect of mid-to-high frequency noise.

[0004] However, the aforementioned tortuous silencer channel design has a fundamental technical flaw—its channel structure is a rigid, fixed design. This means the degree of curvature and cross-sectional area of ​​the channel are fixed after the product leaves the factory, making it impossible to adaptively adjust according to the actual operating conditions of the air pump. This leads to the following technical problems: Under low airflow or low flow rate conditions, the airflow velocity in the tortuous channel is low, and the reflection and scattering effect of the channel wall on the sound wave is weakened. The noise reduction capacity of the channel is often insufficient, making it difficult to reduce the noise to below the target level. In particular, for low-frequency intake noise, the wavelength of low-frequency sound waves in the tortuous channel is large under low flow rate conditions. The effective noise reduction band of the tortuous structure is difficult to cover the low-frequency band, causing low-frequency noise to penetrate the channel and leak outward. Users can still perceive obvious low-frequency humming or pulsating sounds, affecting the comfort of use.

[0005] Under conditions of high air volume or high flow velocity, the airflow will generate a large local pressure loss and turbulence intensity when passing through each bend due to the sudden change in flow direction. As the bend angle increases, the total flow resistance of the flow channel increases sharply, which leads to a significant reduction in the ventilation efficiency of the air pump. The pump body needs to consume more energy to overcome the flow resistance, resulting in increased energy consumption.

[0006] Therefore, it is necessary to design an air pump device with a noise reduction structure to solve the above problems. Summary of the Invention

[0007] The purpose of this invention is to address the shortcomings of existing technologies by proposing an air pump device with a noise reduction structure. This invention achieves dual adaptive adjustment of the "curvature" and "diameter cross-section" of the noise reduction channel, taking into account both the requirements of high-efficiency noise reduction at low flow rates and low wind resistance at high flow rates.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: An air pump device with a noise reduction structure includes a housing, on which an air inlet and an air outlet are provided; A noise reduction mechanism is disposed within the housing. The noise reduction mechanism includes a flexible noise reduction channel and a guide and shaping component disposed at the bend of the flexible noise reduction channel. One end of the flexible noise reduction channel is connected to the air inlet. A drive mechanism, disposed within the housing, is used to drive the other end of the flexible silencing channel to move axially according to airflow parameters; The guiding and shaping assembly includes a movable seat that is slidably disposed along the axial direction of the flexible silencing channel, and two positioning rollers disposed on the movable seat and located on both sides of the flexible silencing channel; When the drive mechanism stretches or contracts the flexible silencing channel, it simultaneously drives the moving seat to translate axially to change the curvature of the flexible silencing channel.

[0009] In some possible implementations, the flexible noise-absorbing channel is configured as an S-shaped channel and is made of elastic rubber material; The silencing mechanism is configured in multiple groups and arranged in parallel within the outer casing; The outer casing is also equipped with an air guide plate, which is arc-shaped on the side near the outlet of the silencing mechanism.

[0010] In some possible implementations, the drive mechanism includes a cylinder fixedly mounted inside the bottom of the housing and a pull plate fixedly connected to the telescopic end of the cylinder; The other end of the S-shaped flow channel is fixedly connected to the pull plate; A connecting rod is fixedly connected to the pull plate, and a triangular block is fixedly connected to the connecting rod. The triangular block moves with the operation of the cylinder to push the movable seat located in the middle position.

[0011] In some possible implementations, a plurality of base plates are fixed to the bottom of the housing, and a first slide rail is fixed to the base plate, and the movable seat is slidably connected to the first slide rail; First racks are fixedly connected to both sides of the movable seat in the middle and to the adjacent sides of the movable seats on both sides. The bottom of the outer casing is rotatably connected to a rotating shaft, and a first gear is fixed on the rotating shaft. Two adjacent first racks respectively mesh with the two sides of the first gear. A fixing block is fixedly connected to the base plate located in the middle, and a spring is elastically connected between the movable seat and the fixing block.

[0012] In some possible implementations, a displacement adjustment mechanism is also included. During the axial translation of the movable seat, the displacement adjustment mechanism synchronously drives two positioning rollers to move relative to or away from each other, so as to change the cross-sectional area of ​​the flow channel at the bend of the flexible noise-absorbing flow channel. The displacement adjustment mechanism includes a second slide rail disposed on the upper end of the movable seat and two moving blocks slidably connected to the second slide rail. The two positioning rollers are respectively rotatably connected to the corresponding moving blocks. A bidirectional lead screw is rotatably mounted on the movable base, and the two movable blocks are respectively threaded onto the bidirectional lead screw.

[0013] In some possible implementations, a vertical rod is rotatably connected to the movable seat, and bevel gears that mesh with each other are fixedly connected to both the vertical rod and the bidirectional lead screw; A second gear is fixedly installed on the vertical rod, and a second rack that meshes with the second gear is fixedly connected to the base plate.

[0014] In some possible implementations, the housing includes a lower shell and an upper cover that fits over the lower shell; The air inlets are symmetrically located on the left and right sides of the lower shell, and the air outlets are located on the upper cover. A power module is also installed inside the lower shell.

[0015] In some possible implementations, the two air guides are fixedly connected to the pull plate, and the connection is located below the S-shaped flow channel, so that the airflow blown out of the S-shaped flow channel hits the air guides and thus changes the flow direction of the airflow.

[0016] The present invention has the following beneficial effects: 1. Dual dynamic adaptation of curvature and cross-sectional area: By driving the flexible silencing channel to move axially through the drive mechanism, not only can the curvature of the channel be changed, but also the positioning rollers on both sides can be moved towards or away from each other through the linkage adjustment mechanism to achieve synchronous compression or release of the pipe diameter and cross-sectional area. At low flow rates, deep curvature + narrow pipe diameter enhances the silencing of impedance changes; at high flow rates, straight bend + original pipe diameter eliminates wind resistance. 2. Multi-bend point linkage, smooth and efficient: The bidirectional meshing transmission of the first rack and the first gear is adopted. Only the middle moving seat needs to be pushed to drive the moving seats on both sides to move synchronously in the opposite direction, which ensures the smoothness, proportional stretching and reset of each bend peak or trough of the S-shaped flow channel. 3. Pure mechanical displacement conversion: Utilizing the travel of the moving seat sliding on the base plate, the axial linear motion is smoothly converted into the radial displacement motion of the two positioning rollers through the "second rack-second gear-bevel gear-double-direction screw". The structure is tight and reliable, and no additional motor drive is required.

[0017] 4. Airflow guidance and reduction of secondary turbulence noise: By setting an arc-shaped air guide plate on the outlet side of the silencer mechanism, the high-speed airflow that will be ejected laterally from the S-shaped flow channel can be smoothly guided to blow upwards in an arc shape, avoiding the vortex generated by the two opposing forces, thereby reducing the secondary wind noise and flow resistance loss of the airflow inside the cavity.

[0018] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a gas pump device with a noise reduction structure proposed in this invention. Figure 2 This is a cross-sectional view of the air pump device with a noise reduction structure proposed in this invention from the right side. Figure 3 This is a top-view cross-sectional structural diagram of an air pump device with a noise reduction structure proposed in this invention. Figure 4 This is a schematic diagram of the noise reduction mechanism; Figure 5 for Figure 4 A structural diagram viewed from below; Figure 6 A schematic diagram of the structure of the guiding and shaping component; Figure 7 for Figure 6 A structural diagram from another perspective; Figure 8 This is a schematic diagram of the S-shaped flow channel for low-flow-rate air. Figure 9 This is a schematic diagram of the S-shaped flow channel for high-flow-rate air.

[0020] In the diagram: 101 Lower shell, 102 Upper cover, 103 Air outlet, 104 Air inlet, 105 Power module, 201 S-shaped flow channel, 202 Cylinder, 203 Pulling plate, 204 Connecting rod, 205 Triangular block, 206 Base plate, 207 First slide rail, 208 Moving seat, 209 Positioning roller, 210 Spring, 301 First rack, 302 Rotating shaft, 303 First gear, 401 Second slide rail, 402 Bidirectional lead screw, 403 Moving block, 404 Second rack, 405 Second gear, 406 Vertical rod, 407 Bevel gear, 501 Air guide plate. Detailed Implementation

[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0022] Reference Figures 1-3This embodiment provides an air pump device with a noise reduction structure, including a housing, a noise reduction mechanism and a drive mechanism; The outer casing includes a lower shell 101 and an upper cover 102. The lower shell 101 has symmetrical air inlets 104 on its left and right sides, and the upper cover 102 has an air outlet 103 on its top. The lower shell 101 has a power module 105 installed inside, and multiple sets of silencers connected to the air inlets 104 are symmetrically arranged inside.

[0023] Reference Figure 3 and Figure 4 The drive mechanism is fixedly installed at the bottom of the lower shell 101 and is used to drive the other end of the S-shaped flow channel 201 to move axially according to the airflow parameters.

[0024] Specifically, the drive mechanism includes a cylinder 202 and a pull plate 203. The cylinder 202 is fixedly installed on the inner bottom of the lower shell 101, and its telescopic end is fixedly connected to the pull plate 203. The end of the S-shaped flow channel 201 away from the air inlet 104 is fixedly connected to the pull plate 203.

[0025] When the cylinder 202 extends or retracts, the pulling plate 203 drives the end of the S-shaped flow channel 201 to move axially, thereby stretching or relaxing the S-shaped flow channel 201 as a whole and changing its curvature. The cylinder 202 adopts a pneumatic drive method, which has a fast response speed and stable output force, and can track changes in airflow conditions and quickly adjust the flow channel state.

[0026] A connecting rod 204 is fixedly connected to the side of the pull plate 203, and a triangular block 205 is fixedly connected to the extension end of the connecting rod 204. The triangular block 205 moves with the extension and retraction of the cylinder 202. Through the inclined structure of the triangular block 205, the axial output force of the cylinder 202 is smoothly converted into a lateral force that pushes the intermediate moving seat 208 to translate, thus realizing the mechanical transmission between the drive mechanism and the guide shaping component.

[0027] A gas flow rate sensor is installed at the air outlet 103. The cylinder 202 automatically adjusts its extension and contraction based on the airflow signal detected by the gas flow rate sensor, thereby changing the stretching degree and bending state of the S-shaped flow channel 201 in real time. This sensor feedback mechanism enables the device to sense the operating conditions of the air pump and automatically switch the flow channel configuration. It can achieve the optimal balance between high efficiency and noise reduction at low flow rate and low wind resistance at high flow rate without manual intervention.

[0028] Reference Figure 3 and Figure 4Each silencing mechanism includes multiple parallel flexible silencing channels and guide shaping components. The flexible silencing channels are S-shaped channels 201 made of elastic rubber. The use of elastic rubber in the S-shaped channels 201 gives them good flexibility and deformation capabilities. Under the stretching or relaxing action of the drive mechanism, they can freely change their bending curvature. Furthermore, they can withstand the radial extrusion of the positioning rollers 209 at the bends without easily breaking. This provides a material basis for the subsequent realization of dual adaptive adjustment of bending degree and pipe diameter cross-sectional area.

[0029] The silencing mechanism is set up in multiple groups and arranged in parallel inside the shell. The layout of multiple groups in parallel ensures that the total ventilation cross-sectional area meets the large flow rate requirements, while keeping the individual size of each flow channel within a small range. This enhances the reflection and scattering effect of sound waves on the wall of each flow channel, thereby improving the overall silencing performance.

[0030] One end of the S-shaped flow channel 201 is fixedly connected to the air inlet 104, and the other end is fixedly connected to the pull plate 203 of the drive mechanism. Each S-shaped flow channel 201 has three bending nodes, and each bending node is equipped with a set of guide and shaping components for shaping support and cross-sectional adjustment at the bend of the flow channel.

[0031] The noise reduction mechanism of the tortuous flow channel is as follows: the airflow experiences a sudden change in direction at the bend, resulting in local pressure loss and thus reducing sound energy; the channel wall reflects and scatters sound waves multiple times to achieve sound wave attenuation; the tortuous path increases the propagation path of sound waves, enhancing the natural attenuation effect of mid-to-high frequency noise. By changing the degree of curvature of the S-shaped flow channel 201 through the drive mechanism, the intensity of the above-mentioned noise reduction mechanism can be dynamically adjusted, enabling the device to maintain good noise reduction performance under different operating conditions.

[0032] Reference Figure 4 and Figure 7 The guide and shaping assembly is used for shaping support and cross-section adjustment at the bend of the S-shaped flow channel 201, and includes a moving seat 208 and a positioning roller 209.

[0033] Multiple base plates 206 are fixed to the inner bottom of the lower shell 101. Multiple first slide rails 207 extending axially are laid on the base plates 206. The movable seat 208 is slidably connected to the first slide rails 207 and can move axially back and forth along the first slide rails 207.

[0034] Three movable seats 208 are provided for each S-shaped flow channel 201, located at its three bending nodes respectively. The movable seat 208 in the middle position is fixedly connected to the left and right sides of the first rack 301 respectively. The adjacent sides of the movable seats 208 on both sides (i.e. the side closer to the middle) are also fixedly connected to the first rack 301 respectively. A rotating shaft 302 is rotatably connected to the base plate 206. A first gear 303 is fixedly sleeved on the rotating shaft 302. The two adjacent first racks 301 mesh with the left and right sides of the first gear 303 respectively, forming a gear and rack linkage mechanism. A fixing block is also fixedly connected to the base plate 206 in the middle position.

[0035] A spring 210 is elastically connected between the middle movable seat 208 and the fixed block. The spring 210 provides a continuous restoring force to the movable seat 208. When the cylinder 202 push rod extends and the triangular block 205 releases its push, the restoring force of the spring 210 drives the middle movable seat 208 to move back. Through gear and rack linkage, it drives the two movable seats 208 on both sides to move towards the middle synchronously, so that the S-shaped flow channel 201 automatically returns to the deep bending state, realizing the automatic reset of the flow channel configuration.

[0036] Specifically, when the cylinder 202 retracts, it pulls the pull plate 203, and the triangular block 205 pushes the middle movable seat 208 to move along the first slide rail 207. The first rack 301 on the middle movable seat 208 drives the first gear 303 to rotate, and the first gear 303 pushes the first rack 301 on the two movable seats 208 in the opposite direction, so that the three movable seats 208 are spread out in an equal proportion in the axial direction, thereby reducing the curvature of the S-shaped flow channel 201.

[0037] like Figure 6 and Figure 7 As shown, it also includes a displacement adjustment mechanism, which is used to simultaneously change the cross-sectional area of ​​the flow channel at the bend of the S-shaped flow channel 201 during the axial translation of the moving seat 208, thereby realizing the dual linkage adjustment of the curvature and the cross-sectional area of ​​the pipe diameter.

[0038] The displacement adjustment mechanism includes a second slide rail 401 fixedly connected to the upper end of the movable seat 208. Two movable blocks 403 are slidably mounted on the second slide rail 401. Two positioning rollers 209 are vertically rotatably connected to the movable blocks 403 respectively. The bend of the S-shaped flow channel 201 is clamped between the two positioning rollers 209. When the S-shaped flow channel 201 moves axially during the stretching or resetting process, the contact between the positioning rollers 209 and the outer wall of the flow channel changes from sliding friction to rolling friction, which reduces frictional resistance and wear on the outer wall of the flow channel and extends the service life of the elastic rubber flow channel.

[0039] A bidirectional lead screw 402 is rotatably mounted inside the movable base 208. Two movable blocks 403 respectively mesh with the two threaded sections of the bidirectional lead screw 402. A vertical rod 406 is also vertically mounted on the movable base 208. The top of the vertical rod 406 is driven by a pair of bevel gears 407 to the bidirectional lead screw 402. A second gear 405 is fixed at the lower end of the vertical rod 406. A second rack 404 parallel to the first slide rail 207 is fixed on the base plate 206. The second gear 405 and the second rack 404 are in a meshing state.

[0040] Specifically, when the movable seat 208 moves axially along the first slide rail 207, the movable seat 208 drives the second gear 405 to roll along the fixed second rack 404, forcing the vertical rod 406 to rotate; the vertical rod 406 drives the bidirectional lead screw 402 to rotate through the bevel gear 407, thereby driving the two movable blocks 403 and the positioning roller 209 to move closer together on the second slide rail 401 to squeeze the pipe diameter, or to move away from each other to release the pipe diameter.

[0041] It also includes two air guide plates 501, with the opposite sides of the two air guide plates 501 being curved surfaces. The two air guide plates 501 are fixedly connected to the pull plate 203, and the connection point is located below the S-shaped flow channel 201. The high-speed airflow ejected laterally from the S-shaped flow channel 201 impacts the curved surface of the air guide plate 501. The curved surface applies a smooth upward steering force to the lateral high-speed airflow, so that the airflow smoothly transitions from a lateral flow state to an upward flow state, avoiding the generation of vortices between the two sets of opposing airflows, reducing secondary wind noise and flow resistance loss of the airflow inside the cavity, and finally guiding the airflow to be smoothly discharged from the top air outlet 103.

[0042] The working process of this invention is as follows: The operating mode of this device automatically switches according to the airflow magnitude: Reference Figure 8 Low flow rate or low velocity operating conditions: The cylinder 202 push rod extends, the pull plate 203 releases the S-shaped flow channel 201, and the triangular block 205 releases the push on the intermediate moving seat 208; Under the restoring force of spring 210, the three sets of moving seats 208 move towards the middle along the first slide rail 207, so that the S-shaped flow channel 201 returns to the deep bending state. During the process of the moving seat 208 approaching, the second gear 405 rolls in the opposite direction on the second rack 404, driving the two positioning rollers 209 to clamp each other through the bidirectional lead screw 402, squeezing the bend of the S-shaped flow channel 201 and narrowing the cross-sectional area of ​​the flow channel. At this time, a "deep tortuous bend + narrow contraction throat" is formed, which produces a strong reflection and resistance noise reduction effect on the high-frequency noise of the air pump.

[0043] Reference Figure 9 High flow rate or high flow velocity operating conditions: The cylinder 202 retracts, pulling the pull plate 203 and the end of the S-shaped flow channel 201. The triangular block 205 overcomes the resistance of the spring 210 and pushes the intermediate moving seat 208 to move horizontally. Through the linkage of the first gear 303 and the first rack 301, the moving seats 208 on both sides spread outward proportionally, reducing the curvature of the S-shaped flow channel 201. As the movable seat 208 moves horizontally, the second gear 405 rolls along the second rack 404, driving the bidirectional lead screw 402 to move the two positioning rollers 209 back apart and release the pipe diameter. The gas enters through a straightened and restored cross-sectional area flow channel, and then flows along the arc-shaped sidewall of the air guide plate 501. The arc-shaped sidewall applies a smooth upward steering force to the high-speed transverse airflow, causing the airflow to change from a horizontal flow state to an upward rising state, and finally exits from the top air outlet 103. The air guide plate 501 can avoid the generation of impact vortices, and minimizes the flow resistance and aerodynamic noise under high air volume.

[0044] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An air pump device with a noise reduction structure, characterized in that, include: The outer casing is provided with an air inlet (104) and an air outlet (103). A silencing mechanism is disposed inside the housing. The silencing mechanism includes a flexible silencing channel and a guide shaping component disposed at the bend of the flexible silencing channel. One end of the flexible silencing channel is connected to the air inlet (104). A drive mechanism, disposed within the housing, is used to drive the other end of the flexible silencing channel (201) to move axially according to airflow parameters; The guide shaping assembly includes a movable seat (208) that is slidably disposed along the axial direction of the flexible noise-absorbing channel (201), and two positioning rollers (209) disposed on the movable seat (208) and located on both sides of the flexible noise-absorbing channel. When the drive mechanism stretches or contracts the flexible silencing channel (201), it simultaneously drives the moving seat (208) to translate along the axial direction to change the curvature of the flexible silencing channel.

2. The air pump device with a noise reduction structure according to claim 1, characterized in that: The flexible noise-absorbing channel is designed as an S-shaped channel (201) and is made of elastic rubber material; The silencing mechanism is configured in multiple groups and arranged in parallel within the outer casing; The outer casing is also provided with an air guide plate (501), which is arc-shaped on the side near the outlet of the silencing mechanism.

3. The air pump device with a noise reduction structure according to claim 2, characterized in that: The drive mechanism includes a cylinder (202) fixedly installed at the bottom of the housing and a pull plate (203) fixedly connected to the telescopic end of the cylinder (202). The other end of the S-shaped flow channel (201) is fixedly connected to the pull plate (203); A connecting rod (204) is fixedly connected to the pull plate (203), and a triangular block (205) is fixedly connected to the connecting rod (204). The triangular block (205) moves with the cylinder (202) to push the movable seat (208) located in the middle position.

4. The air pump device with a noise reduction structure according to claim 3, characterized in that: Multiple base plates (206) are fixed inside the bottom of the outer shell, and a first slide rail (207) is fixed on the base plate (206). The movable seat (208) is slidably connected to the first slide rail (207). First racks (301) are fixedly connected to both sides of the movable seat (208) located in the middle and to the adjacent sides of the movable seats (208) located on both sides. The bottom of the housing is rotatably connected to a shaft (302), and a first gear (303) is fixed on the shaft (302). Two adjacent first racks (301) mesh with the two sides of the first gear (303) respectively. A fixing block is fixedly connected to the base plate (206) located in the middle, and a spring (210) is elastically connected between the movable seat (208) and the fixing block.

5. The air pump device with a noise reduction structure according to claim 4, characterized in that: It also includes a shift adjustment mechanism. During the axial translation process, the movable seat (208) synchronously drives two positioning rollers (209) to move relative to or away from each other through the shift adjustment mechanism to change the cross-sectional area of ​​the flow channel at the bend of the flexible noise-absorbing flow channel (201). The shift adjustment mechanism includes a second slide rail (401) set on the upper end of the movable seat (208) and two moving blocks (403) slidably connected to the second slide rail (401). The two positioning rollers (209) are respectively rotatably connected to the corresponding moving blocks (403). A bidirectional lead screw (402) is rotatably mounted on the movable seat (208), and two movable blocks (403) are threadedly connected to the bidirectional lead screw (402).

6. The air pump device with a noise reduction structure according to claim 5, characterized in that: A vertical rod (406) is vertically rotatably connected to the movable seat (208), and bevel gears (407) that mesh with each other are fixedly connected to both the vertical rod (406) and the double-acting screw (402). A second gear (405) is fixedly installed on the vertical rod (406), and a second rack (404) that meshes with the second gear (405) is fixedly connected to the base plate (206).

7. The air pump device with a noise reduction structure according to claim 1, characterized in that: The outer casing includes a lower casing (101) and an upper casing (102) covering the lower casing (101). The air inlet (104) is symmetrically located on the left and right sides of the lower shell (101), the air outlet (103) is located on the upper cover (102), and a power module (105) is also installed inside the lower shell (101).

8. The air pump device with a noise reduction structure according to claim 3, characterized in that: The two air guide plates (501) are fixedly connected to the pull plate (203), and the connection is located below the S-shaped flow channel (201), so that the airflow blown out by the S-shaped flow channel (201) hits the air guide plate (501) and thus changes the flow direction of the airflow.

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