Noise reducing air pump

Abstract

The application relates to the technical field of air pumps, in particular to a noise-reducing air pump, which comprises a shell, the shell being provided with a first inner cavity, the first inner cavity being provided with an opening; a sound insulation cover, the sound insulation cover being covered on the opening to close the first inner cavity; a piston member, the piston member being axially reciprocated in the first inner cavity; a motor, the output shaft of the motor being connected with a connecting rod; the piston head is provided with a first air hole and a first one-way valve covered in the air outlet direction of the first air hole; the front end of the shell is provided with a second air hole and a second one-way valve covered in the air outlet direction of the second air hole; the sound insulation cover, the inner wall of the shell and the back surface of the piston head jointly form a sound attenuation cavity structure, and the first air hole is communicated with the sound attenuation cavity structure, so that the problem of large noise of the air pump during operation is solved.

Description

Technical Field

[0001] This application relates to the field of air pump technology, and more particularly to a noise-reducing air pump. Background Technology

[0002] When using an air pump to inflate an object, the piston and motor work together to produce air quickly, thus inflating the object rapidly. However, the noise generated by the piston movement and motor rotation makes the air pump particularly noisy during inflation, affecting the user's inflation experience.

[0003] In the field of inflatable equipment, air pumps, driven by pistons and motors, can efficiently compress and transport gas, enabling rapid inflation of various inflatable objects (such as inflatable mattresses, swimming rings, and hovercraft). Their convenience and inflation efficiency have become one of the core market demands.

[0004] However, noise issues in existing air pumps consistently affect the user experience during operation. As the piston reciprocates linearly within the cylinder, the sliding friction between the piston and the cylinder wall, the impact between the piston head and the gas, and the turbulent disturbances caused by the high-speed flow of air in the intake and exhaust channels further generate mid-to-high frequency noise.

[0005] This type of noise is particularly noticeable in close-range use scenarios (such as home inflation, outdoor camping, etc.), which can not only cause auditory discomfort to users, but also cause noise interference to the surrounding environment. Therefore, this problem needs to be solved. Utility Model Content

[0006] The purpose of this application is to provide a noise-reducing air pump to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this application provides the following technical solution:

[0008] A noise-reducing air pump, comprising:

[0009] An outer shell, the interior of which is hollow to form a first inner cavity, the first inner cavity having an opening;

[0010] A soundproof cover, which closes over the opening to seal the first inner cavity;

[0011] A piston assembly, the piston assembly including a piston head and a connecting rod connected to the piston head, the outer periphery of the piston head being adapted to the inner wall of the first inner cavity for axial reciprocating movement therein;

[0012] The motor, the output shaft of which is connected to the connecting rod;

[0013] The piston head is provided with a first air hole and a first one-way valve covering the air outlet direction of the first air hole;

[0014] The front end of the outer casing is provided with a second vent and a second one-way valve covering the vent in the venting direction.

[0015] The soundproof cover, the inner wall of the outer shell, and the back of the piston head together form a sound-absorbing cavity structure, and the first air hole is connected to the sound-absorbing cavity structure.

[0016] Furthermore, the first vent and the second vent are arranged in a staggered manner.

[0017] Furthermore, the thickness of the soundproof cover is 1-5mm.

[0018] Furthermore, the contour of the soundproof cover is adapted to the contour of the opening.

[0019] Furthermore, it includes a side cover that mates with the front end of the outer shell to form an inflation chamber;

[0020] The side cover is provided with an air inlet, which is connected to the air chamber.

[0021] Furthermore, it includes a sealing ring, which is disposed at the connection between the side cover and the front end of the outer shell.

[0022] Furthermore, the housing includes a first component and a second component;

[0023] A plurality of first threaded holes extending along the length direction of the first component are arranged on the outer periphery of the first component;

[0024] A second threaded hole is provided at a position corresponding to the position of the first threaded hole in the second component;

[0025] The first threaded hole and the second threaded hole are arranged coaxially;

[0026] Fasteners pass through the first threaded hole and the second threaded hole in sequence to achieve a fixed connection between the first component and the second component;

[0027] The second component has the opening.

[0028] Furthermore, this includes planetary gear components;

[0029] The planetary gear assembly includes a gearbox, an internal gear ring is provided along the inner wall of the gearbox, and a sun gear fixedly connected to the motor is installed in the gearbox.

[0030] A plurality of planetary gears are disposed between the sun gear and the internal gear ring;

[0031] Each planetary gear is connected to the sun gear at one end and to the internal gear ring core at the other end.

[0032] The planetary gear assembly also includes a planet carrier, which has multiple through holes, the holes of which correspond to the central holes of the planet gears.

[0033] It includes a number of fixing posts corresponding to the number of planetary gears, with each fixing post passing through the through hole and the shaft hole in sequence to fix the planetary gears in the planet carrier.

[0034] Furthermore, it includes an eccentric wheel, the output shaft of which is connected to the input end of the connecting rod, and the rotation of the eccentric wheel drives the connecting rod to move axially back and forth.

[0035] The central shaft of the eccentric wheel extends into the central bore of the planetary carrier and is interference-fitted with the inner wall of the central bore of the planetary carrier.

[0036] Furthermore, the device includes a shock-absorbing pad, which has a ring-shaped structure. The central hole of the shock-absorbing pad is passed through the central shaft of the eccentric wheel. The shock-absorbing pad is disposed between the planetary carrier and the eccentric wheel. The technical solution provided in this application embodiment has the following advantages compared with the prior art:

[0037] This application provides a noise-reducing air pump that effectively eliminates the mechanical and airflow noise directly generated and transmitted during the axial reciprocating motion of a piston. Specifically, by adapting the piston head to the inner wall of the outer casing and sealing the outer casing opening with a soundproof cover, a sound-absorbing cavity is formed by the soundproof cover, the inner wall of the outer casing, and the back of the piston head, enclosing the piston component. This design, through the soundproof cover and the outer casing, constitutes a physical barrier that directly blocks and reflects the sound energy generated by the piston movement, effectively isolating noise from propagating outwards. Furthermore, these noise waves undergo multiple reflections and interferences within the inner wall of the outer casing, gradually attenuating and losing sound energy. Therefore, this technical solution reduces the decibel level of noise generated by the piston component movement in the air pump by combining measures to isolate propagation and dissipate energy. Attached Figure Description

[0038] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0039] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0040] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0041] Figure 1 This is a schematic diagram of the external structure of the noise reduction air pump according to an embodiment of this application;

[0042] Figure 2 This is a schematic diagram showing the position and structure of the soundproof cover and opening of the noise-reducing air pump according to an embodiment of this application.

[0043] Figure 3 This is an exploded structural diagram of the noise reduction air pump according to an embodiment of this application;

[0044] Figure 4 This is an exploded structural diagram of the noise-reducing air pump from another angle, according to an embodiment of this application.

[0045] Explanation of reference numerals in the attached figures:

[0046] 1. Outer shell; 11. First component; 111. First threaded hole; 12. Second component; 121. Second threaded hole; 13. First inner cavity; 14. Opening; 15. Second vent; 16. Second check valve;

[0047] 2. Soundproof cover;

[0048] 3. Piston assembly; 31. Piston head; 311. First vent; 312. First check valve; 32. Connecting rod;

[0049] 4. Electric motor;

[0050] 5. Side cover; 51. Inflation port; 52. Inflation chamber;

[0051] 6. Sealing ring;

[0052] 7. Planetary gear components; 71. Gearbox housing; 711. Internal gear ring; 72. Sun gear; 73. Planet gears; 74. Planet carrier;

[0053] 8. Eccentric wheel; 81. Central shaft of eccentric wheel; 82. Output shaft of eccentric wheel;

[0054] 9. Shock-absorbing pads. Detailed Implementation

[0055] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0056] The following disclosure provides numerous different embodiments or examples for implementing various structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0057] For ease of description, spatial relative terms may be used in the text to describe the relative position or movement of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "front," "back," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure undergoes a positional flip, orientation change, or change of motion, these directional indications will change accordingly. For instance, an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0058] To address the issue that traditional air pumps generate strong mechanical and aerodynamic noise during operation due to piston movement, which propagates directly outward through the pump housing, resulting in a noisy working environment and a poor user experience.

[0059] In response, the applicant provides a noise-reducing air pump, comprising: a housing 1, the housing 1 being hollow to form a first inner cavity 13, the first inner cavity 13 having an opening 14; a soundproof cover 2, the soundproof cover 2 covering the opening 14 to seal the first inner cavity 13; a piston component 3, the piston component 3 including a piston head 31 and a connecting rod 32 connected to the piston head 31, the outer periphery of the piston head 31 being adapted to the inner wall of the first inner cavity 13 for axial reciprocating movement therein; a motor 4, the output shaft of the motor 4 being connected to the connecting rod 32; a first air hole 311 being provided on the piston head 31, and a first one-way valve 312 covering the air outlet direction of the first air hole 311; a second air hole 15 being provided at the front end of the housing 1, and a second one-way valve 16 covering the air outlet direction of the second air hole 15; the soundproof cover 2, the inner wall of the housing 1, and the back of the piston head 31 together forming a silencing cavity structure, the first air hole 311 communicating with the silencing cavity structure.

[0060] In this application, the side of the piston head 31 facing the soundproof cover 2 is the back side, and the side facing the second air hole 15 is the front side; correspondingly, one end of the outer shell 1 with the second air hole 15 is the front end of the outer shell 1, and the end near the soundproof cover 2 is the rear end of the outer shell 1.

[0061] In this embodiment, the air pump operates in two phases: intake and exhaust. During the intake phase, the air pump draws in external gas to prepare for inflating the item to be inflated. During the exhaust phase, the air pump fills the item with the gas drawn in during the intake phase, thus inflating the connected item.

[0062] Specifically, during the intake phase, the piston head 31 moves toward the front end of the outer casing 1 (away from the soundproof cover 2) to increase the volume of the first inner cavity 13, and external gas is first drawn in and fills the first inner cavity 13.

[0063] During the exhaust phase, when the piston head 31 moves toward the soundproof cover 2, it divides the first inner cavity 13 into a first sub-inner cavity near the second air hole 15 and a second sub-inner cavity near the soundproof cover 2. The compressed gas enters the first sub-inner cavity from the second sub-inner cavity through the first air hole 311. As the gas flows from the second sub-inner cavity into the first sub-inner cavity and the flow rate gradually increases, it eventually opens the second one-way valve 16 on the second air hole 15 at the front end of the outer shell 1 and flows to the front end of the outer shell 1 to finally reach the inflation chamber 52 located at the front end of the outer shell 1.

[0064] When the piston component 3 reciprocates, the mechanical noise generated by the friction between the piston head 31 and the inner wall of the outer shell 1 will be confined inside the sound-absorbing structure. After multiple reflections and mutual interferences by the inner wall of the outer shell 1, the sound energy will gradually attenuate and be lost, thereby achieving noise reduction of the air pump and improving the user experience.

[0065] In one specific embodiment, the first vent 311 and the second vent 15 are arranged in a staggered manner.

[0066] It should be understood that by spatially offsetting the first vent 311 and the second vent 15, a non-linear buffer is created in the airflow path. When the high-pressure gas compressed by the piston component 3 is ejected from the first vent 311, it impacts the inner wall of the opposite outer casing 1 instead of directly entering the second vent 15. Its kinetic energy is dispersed and dissipated, thus buffering and homogenizing the airflow, resulting in a smoother opening of the second one-way valve 16. This design effectively reduces secondary noise generated by gas flow, minimizes the direct impact of airflow on the second one-way valve 16, improves the stability and lifespan of the second one-way valve 16, and makes the exhaust process smoother and quieter.

[0067] Furthermore, the thickness of the soundproof cover 2 is 2-5mm. It should be understood that if the soundproof cover 2 is too thin, the soundproofing effect will be poor, and if it is too thick, it will lead to an unnecessary increase in the size and cost of the air pump.

[0068] To address this, the present invention limits the thickness of the soundproof cover 2 to 2-5mm. When sound waves impact the soundproof cover 2, the soundproofing material within this optimal thickness range can effectively dissipate a large amount of sound energy through internal damping, avoiding sound wave penetration due to insufficient thickness or material waste and bulky structure due to excessive thickness. It can be understood that this thickness range achieves the best balance between product lightweighting and cost control while ensuring sound insulation performance.

[0069] Furthermore, to ensure the airtightness of the soundproofing structure, the contour of the soundproof cover 2 is adapted to the contour of the opening 14.

[0070] It is understandable that if the soundproof cover 2 and the opening 14 of the outer shell 1 do not fit tightly, gaps will form, leading to noise leakage and significantly reducing the overall noise reduction effect. Therefore, by matching the contour of the soundproof cover 2 with the contour of the opening 14, a surface or line contact seal is achieved between the soundproof cover 2 and the opening 14 of the outer shell 1, eliminating sound leakage from gaps. This ensures that no noise can escape through the gaps at the cover joint, regardless of the movement of the piston component 3.

[0071] In another embodiment, a side cover 5 is included, which mates with the front end of the outer shell 1 to form an inflation cavity 52; the side cover 5 is provided with an inflation port 51, which communicates with the inflation cavity 52. ​​A sealing ring 6 is included, which is located at the connection between the side cover 5 and the front end of the outer shell 1.

[0072] This design allows gas to enter the inflation chamber 52 after the gas pushes open the second one-way valve 16 through the second air hole 15 during the air pump's output phase, preventing gas from escaping from the connection between the outer shell 1 and the side cover 5.

[0073] Specifically, the gas compressed by the piston component 3 enters the inflation chamber 52 through the second air hole 15, and is stably output to the item to be inflated through the inflation port 51 in the inflation chamber 52. The acoustic energy of the gas is buffered in the inflation chamber 52 before entering the item to be inflated, which can effectively reduce the generation of gas turbulence. The sealing ring 6 can dynamically compensate for the micro-unevenness of the mating surfaces of the parts according to its own elastic properties, and always maintain the airtightness at the connection between the side cover 5 and the outer shell 1. This achieves efficient and stable collection and output of compressed air, prevents high-pressure gas from leaking from the assembly gaps, and ensures the working efficiency and reliability of the air pump.

[0074] In addition, to reduce the noise of the air pump, this air pump also includes a planetary gear assembly 7; the planetary gear assembly 7 includes a gearbox 71, an internal gear ring 711 is arranged along the inner wall of the gearbox 71, and a sun gear 72 fixedly connected to the motor 4 is installed in the gearbox 71; a plurality of planet gears 73 are arranged between the sun gear 72 and the internal gear ring 711; one end of each planet gear 73 is meshed with the sun gear 72, and the other end is connected to the core of the internal gear ring 711; the planetary gear assembly 7 also includes a planet carrier 74, which is provided with a plurality of through holes, the through holes corresponding to the shaft holes of the planet gears 73, and includes a number of fixing posts corresponding to the number of planet gears 73, each fixing post passing through the through hole and the shaft hole in sequence to realize the planet carrier 74 fixing the planet gears 73. The system includes an eccentric wheel 8, whose output shaft 82 is connected to the input end of the connecting rod 32. The rotation of the eccentric wheel 8 drives the connecting rod 32 to reciprocate axially. The central shaft 81 of the eccentric wheel extends into the central bore of the planetary carrier 74 and is press-fitted to the inner wall of the central bore. The system also includes a shock-absorbing pad 9, which has a ring-shaped structure. The central bore of the shock-absorbing pad 9 is passed through by the central shaft of the eccentric wheel 8, and the shock-absorbing pad 9 is positioned between the planetary carrier 74 and the eccentric wheel 8.

[0075] It should be understood that the high-speed rotation of motor 4 needs to be converted into the low-speed reciprocating motion of the piston, and the mechanical vibration and impact during the conversion process are one of the main sources of noise. Therefore, this technical solution uses planetary gear component 7 to reduce speed and increase torque; uses eccentric wheel 8 to convert rotational motion into axial reciprocating motion; and sets shock-absorbing pad 9 between planetary carrier 74 and eccentric wheel 8. Through the cooperation of planetary gear component 7, eccentric wheel 8 and shock-absorbing pad 9, a mechanism that includes speed reduction and motion conversion functions is constructed.

[0076] Specifically, when motor 4 starts, its output shaft drives sun gear 72 to rotate. Since planetary gears 73 are meshed with sun gear 72, sun gear 72 drives planetary gears 73 to rotate. Simultaneously, planetary gears 73 rotate along the external gear ring and drive the planet carrier 74, which is fixedly connected to them, to move. The central bore of planet carrier 74 is fixedly press-fitted to the central shaft of eccentric gear 8. When planet carrier 74 rotates, eccentric gear 8 also rotates simultaneously via the central shaft 81 of eccentric gear. However, since the output shaft 82 of eccentric gear and the central shaft of eccentric gear 8 are not on the same axis, eccentric gear 8, while rotating, can drive the connecting rod 32 connected to the output shaft 82 of eccentric gear to move axially back and forth. By placing a damping pad 9 between planet carrier 74 and eccentric gear 8, the damping pad 9 can absorb the vibration generated when planet carrier 74 drives eccentric gear 8, thereby reducing noise.

[0077] It should be understood that the planetary gear mechanism smoothly reduces the speed of motor 4 and increases the output torque; the eccentric wheel 8 converts rotary motion into linear reciprocating motion; and the shock-absorbing pad 9 dynamically absorbs and buffers the impact and vibration generated during gear meshing and motion conversion. This design, through the cooperation of these three components, achieves smooth, efficient, and low-noise power transmission, reduces vibration and noise generated by mechanical transmission, and improves the overall smoothness and lifespan of the machine.

[0078] In another embodiment, the outer casing 1 includes a first component 11 and a second component 12; a plurality of first threaded holes 111 extending along the length direction of the first component 11 are arranged on the outer periphery of the first component 11; a second threaded hole 121 is provided on the second component 12 at a position corresponding to the position of the first threaded hole 111; the first threaded hole 111 and the second threaded hole 121 are arranged coaxially; fasteners pass through the first threaded hole 111 and the second threaded hole 121 in sequence to realize the fixed connection between the first component 11 and the second component 12; an opening 14 is provided on the second component 12.

[0079] It should be noted that in this embodiment, the outer casing 1 is designed as two detachably connected components, so that one of the components can be replaced in the event of air pump failure, and at the same time, it is also convenient for production.

[0080] In addition, the air pump housing 1 is an important component of the noise reduction structure, and the stability and sealing of the air connection are also crucial.

[0081] To address this, the technical solution employs a plurality of first threaded holes 111 extending along the length of the first component 11 on the outer periphery of the first component 11; and a second threaded hole 121 is provided on the second component 12 at a position corresponding to the first threaded hole 111; the first threaded hole 111 and the second threaded hole 121 are arranged coaxially; and fasteners pass through the first threaded hole 111 and the second threaded hole 121 in sequence to achieve a fixed connection between the first component 11 and the second component 12.

[0082] It should be understood that each threaded hole constitutes a connection point, and when there are multiple threaded holes, multiple connections are formed. In this embodiment, a stable and reliable mechanical connection and seal between the two components is achieved through multiple circumferentially distributed connection points; this connection structure can withstand the periodic vibration impact caused by piston movement, maintain the structural integrity of long-term operation, and prevent abnormal noise or leakage caused by vibration-induced loosening of the connection.

[0083] It should be noted that, in this embodiment, the opening 14 described above is provided on the second component 12 so that the soundproof cover 2 covers the opening 14, so that the inner cavity enclosed by the first component 11 and the second component 12 is a sealed space. This allows the air pump in this embodiment to form the sound-absorbing cavity structure described above with the cooperation of the outer shell 1, the soundproof cover 2, and the piston head 31 formed by the first component 11 and the second component 12, thereby achieving noise reduction for the air pump when it is inhaling and exhaling air.

[0084] In addition, in this embodiment where the housing 1 is composed of the first component 11 and the second component 12, the planetary gear component 7 and the motor 4 described above are also provided to enable the air pump to operate normally.

[0085] It should also be noted that, regardless of whether the air pump with a one-piece casing 1 as described above, or one with a casing 1 composed of the first component 11 and the second component 12, an air inlet is provided between the motor 4 and the gearbox 71 of the planetary gear component 7. This air inlet communicates with the first inner cavity 13. When the motor 4 starts, gas enters the first inner cavity 13 through the air inlet to achieve the air pump's suction operation. Additionally, a fan is installed at the tail of the motor to dissipate heat from the entire air pump.

[0086] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0087] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0088] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0089] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0090] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0091] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. The illustrative expressions of the above terms in this specification should not be construed as necessarily referring to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0092] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Since these modifications and variations fall within the scope of the claims and their equivalents, this application also intends to include these modifications and variations.

[0093] The above describes specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A noise-reducing air pump, characterized in that, include: An outer shell, the interior of which is hollow to form a first inner cavity, the first inner cavity having an opening; A soundproof cover, which closes over the opening to seal the first inner cavity; A piston assembly, the piston assembly including a piston head and a connecting rod connected to the piston head, the outer periphery of the piston head being adapted to the inner wall of the first inner cavity for axial reciprocating movement therein; The motor, the output shaft of which is connected to the connecting rod; The piston head is provided with a first air hole and a first one-way valve covering the air outlet direction of the first air hole; The front end of the outer casing is provided with a second vent and a second one-way valve covering the vent in the venting direction. The soundproof cover, the inner wall of the outer shell, and the back of the piston head together form a sound-absorbing cavity structure, and the first air hole is connected to the sound-absorbing cavity structure.

2. The noise-reducing air pump according to claim 1, characterized in that: The first vent and the second vent are arranged in a staggered manner.

3. The noise-reducing air pump according to claim 1, characterized in that: The thickness of the soundproof cover is 1-5mm.

4. The noise-reducing air pump according to claim 1, characterized in that: The contour of the soundproof cover is adapted to the contour of the opening.

5. The noise-reducing air pump according to claim 1, characterized in that: Includes a side cover, which mates with the front end of the outer shell to form an inflation chamber; The side cover is provided with an air inlet, which is connected to the air chamber.

6. The noise-reducing air pump according to claim 5, characterized in that: Includes a sealing ring, which is located at the connection between the side cover and the front end of the outer shell.

7. The noise-reducing air pump according to claim 1, characterized in that: The outer casing includes a first component and a second component; A plurality of first threaded holes extending along the length direction of the first component are arranged on the outer periphery of the first component; A second threaded hole is provided at a position corresponding to the position of the first threaded hole in the second component; The first threaded hole and the second threaded hole are arranged coaxially; Fasteners pass through the first threaded hole and the second threaded hole in sequence to achieve a fixed connection between the first component and the second component; The second component has the opening.

8. The noise-reducing air pump according to claim 1, characterized in that: Includes planetary gear components; The planetary gear assembly includes a gearbox, an internal gear ring is provided along the inner wall of the gearbox, and a sun gear fixedly connected to the motor is installed in the gearbox. A plurality of planetary gears are disposed between the sun gear and the internal gear ring; Each planetary gear is connected to the sun gear at one end and to the internal gear ring core at the other end. The planetary gear assembly also includes a planet carrier, which has multiple through holes, the holes of which correspond to the central holes of the planet gears. It includes a number of fixing posts corresponding to the number of planetary gears, with each fixing post passing through the through hole and the shaft hole in sequence to fix the planetary gears in the planet carrier.

9. The noise-reducing air pump according to claim 8, characterized in that: It includes an eccentric wheel, the output shaft of which is connected to the input end of the connecting rod. The rotation of the eccentric wheel drives the connecting rod to move axially back and forth. The central shaft of the eccentric wheel extends into the central bore of the planetary carrier and is interference-fitted with the inner wall of the central bore of the planetary carrier.

10. The noise-reducing air pump according to claim 9, characterized in that: It includes a shock-absorbing pad, which has a ring-shaped structure. The central hole of the shock-absorbing pad is passed through the central shaft of the eccentric wheel, and the shock-absorbing pad is disposed between the planetary carrier and the eccentric wheel.

Images