Noise reduction structure and air pump

Abstract

The utility model relates to the field of air pumps, and discloses a noise reduction structure and an air pump. The noise reduction structure is installed on the air pump, the air pump is provided with an air outlet, the noise reduction structure comprises a positioning piece, an elastic piece, an elastic piece and an exhaust piece, the positioning piece is arranged on the plane where the air outlet is located, a positioning hole is formed in the elastic piece, the positioning piece penetrates through the positioning hole, the elastic piece is arranged on the periphery of the air outlet, and the elastic piece abuts against the surface of the elastic piece. The exhaust piece is fixedly installed on the air pump, and the elastic piece and the elastic piece are both located in the exhaust piece. According to the air pump, the elastic piece is installed through cooperation of the positioning piece and the positioning hole, the elastic piece is arranged between the elastic piece and the plane where the air outlet is located, and therefore the elastic piece makes contact with the elastic piece when the elastic piece is opened and closed, and noise generated when the air pump works is reduced.

Description

Technical Field

[0001] This application relates to the field of air pumps, and particularly to a noise reduction structure and an air pump. Background Art

[0002] In the manufacturing field of conventional piston pump cores, the fixing methods of the outlet stainless steel shrapnel usually adopt two methods: press riveting and screwing. Although these two methods ensure the stability of the shrapnel to a certain extent, there are certain defects. Specifically, when the stainless steel shrapnel is under the combined action of the screw locking force and the press riveting fixing force during the assembly process, its elastic arm will deform, resulting in a reduction in the opening and closing angle of the shrapnel, thereby affecting the air delivery efficiency. More seriously, this deformation may directly cause irreversible deformation of the shrapnel, increasing the noise level of the equipment. The existing fixing methods also require the use of special assembly jigs, increasing the complexity and labor cost in the production process, which is not conducive to the improvement of production efficiency and cost reduction. Summary of the Utility Model

[0003] In view of this, the purpose of this application is to overcome the deficiencies in the prior art and provide a noise reduction structure and an air pump.

[0004] To achieve the above purpose, the technical solution adopted in this application is as follows:

[0005] This application provides:

[0006] A noise reduction structure is installed on an air pump. The air pump has an air outlet. The noise reduction structure includes:

[0007] A positioning member is disposed on the plane where the air outlet is located;

[0008] A shrapnel is provided with a positioning hole, and the positioning member passes through the positioning hole;

[0009] An elastic member is disposed on the outer periphery of the air outlet, and the shrapnel abuts against the surface of the elastic member;

[0010] An exhaust member is fixedly installed on the air pump, and both the shrapnel and the elastic member are located inside the exhaust member.

[0011] Further, an installation groove is formed on the plane where the air outlet is located, and the elastic member is installed in the installation groove, and a part of the elastic member protrudes from the installation groove.

[0012] Further, the number of the positioning members is N, and the number of the positioning holes is M, satisfying: N = M ≥ 2.

[0013] Further, the elastic piece includes a mounting piece, the positioning hole is formed through the mounting piece, an elastic arm is arranged on the inner hole wall of the mounting piece, a cover plate is arranged on the elastic arm, and the cover plate is larger than the air outlet.

[0014] Further, the end face of the mounting piece, the end face of the elastic arm and the end face of the cover plate are located in the same plane.

[0015] Further, a sealing member is arranged between the exhaust member and the plane where the air outlet is located.

[0016] Further, the exhaust member includes a mounting cover, a receiving groove is formed in the end face of the mounting cover close to the air outlet direction, an avoidance groove is formed in the end face of the receiving groove away from the air outlet, an air outlet pipe is arranged on the outer wall of the mounting cover, and the air outlet pipe is communicated with the avoidance groove.

[0017] Further, at least one guiding groove is formed on the outer surface of the mounting cover.

[0018] The present application provides an air pump, which includes:

[0019] A cylinder block, a cylinder cavity is formed inside the cylinder block, an air outlet is formed through the end face of the cylinder cavity, and the air outlet is communicated with the cylinder cavity;

[0020] A noise reduction structure, any one of the above-mentioned noise reduction structures is installed on the cylinder block;

[0021] A piston, the piston is arranged inside the cylinder cavity, and the piston can move in the cylinder cavity;

[0022] A connecting rod, the connecting rod is installed and connected with the piston, and the end of the connecting rod away from the piston is located outside the cylinder cavity;

[0023] A driving device, the driving device is installed and connected with the connecting rod, and the driving device is used to drive the piston to move in the cylinder cavity.

[0024] Further, the driving device includes a mounting frame installed on the cylinder block, a gear set is rotatably installed on the mounting frame, and a rotary driving member is fixedly installed on the mounting frame. The rotary driving member is used to drive the gear set to rotate, and the gear set is connected with the connecting rod.

[0025] In the present application, the elastic piece is installed through the cooperation of the positioning piece and the positioning hole, and an elastic member is arranged between the elastic piece and the plane where the air outlet is located, so that when the elastic piece opens and closes, it contacts the elastic member, reducing the noise generated when the air pump works.

[0026] To make the above objects, features and advantages of the present application more obvious and understandable, the following specifically enumerates preferred embodiments and, in conjunction with the accompanying drawings, makes the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] To more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application and should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0028] Figure 1 Shows a schematic diagram of the exploded state of the noise reduction structure of the present application;

[0029] Figure 2 Shows a schematic cross-sectional view of the assembled state of the noise reduction structure and the air pump of the present application;

[0030] Figure 3 Shows the present application Figure 2 An enlarged schematic diagram at position A;

[0031] Figure 4 Shows a schematic diagram of the shrapnel structure of the present application;

[0032] Figure 5 Shows a schematic diagram of the exhaust part structure of the present application;

[0033] Figure 6 Shows a schematic diagram of the assembled state of the noise reduction structure, the air pump, and the driving device of the present application.

[0034] Description of the main component symbols:

[0035] 100 - Noise reduction structure; 110 - Positioning part; 120 - Shrapnel; 121 - Mounting piece; 122 - Elastic arm; 123 - Cover plate; 130 - Positioning hole; 140 - Elastic part; 150 - Exhaust part; 151 - Mounting cover; 152 - Accommodating groove; 153 - Avoidance groove; 154 - Air outlet pipe; 155 - Guide groove; 160 - Mounting groove; 170 - Sealing part; 200 - Air pump; 210 - Cylinder block; 220 - Cylinder cavity; 230 - Piston; 240 - Air outlet; 250 - Connecting rod; 300 - Driving device; 310 - Mounting frame; 320 - Gear set; 330 - Rotary driving part. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0036] The embodiments of the present application will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application and should not be construed as limiting the present application.

[0037] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0038] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, the meaning of "a plurality of" is two or more unless otherwise specifically defined.

[0039] In the present application, unless otherwise clearly defined and limited, the terms such as "mounted", "connected", "connected to", "fixed" and the like should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0040] In the present application, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0041] Embodiment:

[0042] The stainless steel spring at the air outlet of the piston pump is usually installed by riveting or screw fastening. Although these two methods ensure the stability of the spring, the elastic arm of the spring is easily deformed during assembly, resulting in a decrease in the opening and closing angle. If the spring undergoes irreversible deformation, it is easy to increase the noise when the air pump is working. In addition, the installation method using screws or riveting is more complicated, which leads to a decrease in assembly efficiency.

[0043] The present application sets a positioning member 110 on the plane where the air outlet 240 is located, and then opens a positioning hole 130 on the spring piece 120 that is adapted to the positioning member 110. The positioning member 110 cooperates with the positioning hole 130 to achieve rapid installation of the spring piece 120. In addition, by setting an elastic member 140 between the spring piece 120 and the plane where the air outlet 240 is located, the spring piece 120 contacts the elastic member 140 when opening and closing, that is, it can be in elastic contact, thereby achieving buffering, thereby reducing the noise generated during the opening and closing process of the spring piece 120.

[0044] The present application provides a noise reduction structure, which is installed on an air pump 200 . The air pump 200 has an air outlet 240 . Specifically, the noise reduction structure includes a positioning member 110 , a spring 120 , an elastic member 140 and an exhaust member 150 .

[0045] The positioning member 110 is arranged on the plane where the air outlet 240 is located, and a positioning hole 130 is opened on the spring piece 120. The positioning member 110 is passed through the positioning hole 130. The elastic member 140 is arranged on the periphery of the air outlet 240. The spring piece 120 abuts against the surface of the elastic member 140. The exhaust member 150 is fixedly installed on the air pump 200. The spring piece 120 and the elastic member 140 are both located inside the exhaust member 150.

[0046] See Figure 1 、 Figure 2 as well as Figure 3 As shown, in this embodiment, the air pump 200 is a piston pump. The present application first realizes the installation of the spring 120 by cooperating with the positioning member 110 and the positioning hole 130, and the diameter of the spring 120 is larger than the air outlet 240, thereby realizing the closure of the air outlet 240. Compared with the existing installation method using screws, the installation method of this embodiment is simpler and faster.

[0047] In this embodiment, the elastic member 140 is located at the outer circumference of the air outlet 240. The lower surface of the elastic sheet 120 contacts the surface of the elastic member 140 to close the opening of the air outlet 240. When the air pump 200 discharges air, it will press against the elastic sheet 120 through the air outlet 240, causing it to deform. As a result, the angle of the elastic sheet 120 increases, allowing the gas to be discharged through the air outlet 240 and finally discharged to the outside through the exhaust member 150, realizing the exhaust function. When the elastic sheet 120 is not subjected to the pressing force, due to its own elastic force, the elastic sheet 120 will return to its initial state, that is, the elastic sheet 120 contacts the surface of the elastic member 140. The elastic member 140 buffers the noise generated when the elastic sheet 120 returns to its initial state, realizing the noise reduction function.

[0048] In this embodiment, the elasticity of the elastic sheet 120 itself and the cooperation with the elastic member 140 achieve unidirectional conduction, that is, air can only be exhausted from the position of the air outlet 240, and air cannot enter from the position of the air outlet 240.

[0049] The number of the positioning members 110 is N, and the number of the positioning holes 130 is M, satisfying: N = M ≥ 2.

[0050] Refer to Figure 1 and Figure 4 As shown, the positioning members 110 are fixedly arranged on the plane where the air outlet 240 is located. The positioning holes 130 are sleeved on the outer surface of the positioning members 110. The number of the positioning members 110 and the positioning holes 130 is the same, that is, N = M in the above. In this embodiment, both the positioning members 110 and the positioning holes 130 are two, that is, N = M = 2 in the above. There is an interval between adjacent two positioning members 110 and between adjacent two positioning holes 130. The specific setting positions can be set as needed, and the number of the positioning members 110 and the positioning holes 130 can also be designed according to actual needs, which is not limited here.

[0051] It should be noted that the number of the positioning members 110 and the number of the positioning holes 130 are both set to be more than two. The purpose is to prevent the elastic sheet 120 from rotating, and the elastic sheet 120 is limited on the plane by two positioning members 110 and two positioning holes 130.

[0052] Furthermore, in this embodiment, the positioning members 110 and the positioning holes 130 have the same shape. The positioning members 110 are cylindrical shafts, and correspondingly, the positioning holes 130 are also circular holes adapted to the cylindrical shafts. Of course, the shapes of the positioning members 110 and the positioning holes 130 can be set as needed, which is not limited here.

[0053] An installation groove 160 is formed on the plane where the air outlet 240 is located. The elastic member 140 is installed in the installation groove 160, and a part of the elastic member 140 protrudes from the installation groove 160.

[0054] Refer to Figure 1 As shown, in order to enable the installation of the elastic member 140, an installation groove 160 is formed in the plane where the air outlet 240 is located for installing the elastic member 140. In the height direction, the height of the elastic member 140 is greater than the depth of the installation groove 160, that is, the elastic member 140 can protrude from the plane where the air outlet 240 is located. When the elastic piece 120 contacts the elastic member 140, the air outlet 240 can be closed, and at the same time, noise reduction and sealing effects can be achieved when contacting the elastic piece 120.

[0055] In this embodiment, the air outlet 240 is circular, and the elastic member 140 can be made of rubber, such as a rubber sealing ring, or other materials that can achieve a certain elastic deformation. Specifically, it is not limited here.

[0056] The elastic piece 120 includes an installation piece 121, the positioning hole 130 is formed through the installation piece 121, an elastic arm 122 is provided on the inner hole wall of the installation piece 121, and a cover plate 123 is provided on the elastic arm 122, and the cover plate 123 is larger than the air outlet 240.

[0057] The end face of the installation piece 121, the end face of the elastic arm 122, and the end face of the cover plate 123 are located on the same plane.

[0058] Refer to Figure 4 As shown, the installation piece 121 has an inner hole, and the elastic arm 122 is integrally formed on the inner wall of the inner hole. Then, the cover plate 123 is integrally formed at the end of the elastic arm 122 away from the installation piece 121. That is, at this time, the cover plate 123 is located inside the installation piece 121. In this embodiment, the installation piece 121, the elastic arm 122, and the cover plate 123 are integrally formed, and can be manufactured by stamping. Moreover, in order to ensure that the cover plate 123 can cover and seal the air outlet 240, the upper surfaces of the installation piece 121, the elastic arm 122, and the cover plate 123 can be in the same plane, and the lower surfaces of the installation piece 121, the elastic arm 122, and the cover plate 123 can be in the same plane.

[0059] Please continue to refer to Figure 4, in this embodiment, the positioning hole 130 is formed through the surface of the mounting piece 121, and the positioning hole 130 is located at the positions in the opposite directions of the elastic arms 122. In this way, the cover plate 123 can be opened and closed upward with the elastic arms 122 as the bending points, so as to release the state of closing the air outlet 240. Since the cover plate 123 is limited only at one position of the elastic arms 122 and is not restricted by the screw fixation in the existing installation method, the cover plate 123 can have a larger opening and closing angle compared with the plane where the air outlet 240 is located, so that the exhaust is more smooth and efficient. It should be noted that the elastic arms 122 themselves have a certain elasticity and can return to the initial state.

[0060] In this embodiment, the mounting piece 121, the elastic arms 122 and the cover plate 123 can be integrally stamped from stainless steel material. In other embodiments, other elastic materials can also be selected, and the specific materials are not limited here.

[0061] A seal 170 is provided between the exhaust member 150 and the plane where the air outlet 240 is located.

[0062] Refer to Figures 1 to 4 As shown, in order to enable the gas from the air pump 200 to be discharged through the exhaust member 150, it is necessary to seal between the exhaust member 150 and the air pump 200 to prevent gas leakage.

[0063] In this embodiment, the seal 170 is an O-ring. The model and size of the O-ring are not limited here and are selected and designed according to actual needs. <()

[0064] The exhaust member 150 includes a mounting cover 151. A receiving groove 152 is formed in the end face of the mounting cover 151 close to the air outlet 240 direction. An avoidance groove 153 is formed in the end face of the receiving groove 152 away from the air outlet 240. An air outlet pipe 154 is provided on the outer wall of the mounting cover 151, and the air outlet pipe 154 communicates with the avoidance groove 153.

[0065] Refer to Figure 2 , Figure 3 and Figure 5 As shown, a receiving groove 152 is formed in the bottom surface of the mounting cover 151, an avoidance groove 153 is formed in the inner top surface of the receiving groove 152, and the avoidance groove 153 communicates with the air outlet pipe 154. When exhaust is required, the air outlet 240, the avoidance groove 153 and the air outlet pipe 154 form a channel for gas to be discharged.

[0066] Please refer to Figure 3As shown, a space for installing the seal 170 is formed between the receiving groove 152 and the cylinder block 210 in the air pump 200. The avoidance groove 153 is used to avoid the position change generated when the cover plate 123 is opened, preventing the cover plate 123 from directly contacting the inner wall of the avoidance groove 153, thereby providing a space for the cover plate 123 to open and close.

[0067] At least one guiding groove 155 is formed on the outer surface of the installation cover 151. Refer to Figure 1 and Figure 5 As shown, through the cooperation of the guiding groove 155 and the installation post (not labeled in the figure) on the air pump 200, rapid positioning and installation are achieved, making the assembly efficiency higher.

[0068] The present application provides an air pump. The air pump 200 includes a cylinder block 210, any one of the above noise reduction structures 100, a piston 230, a connecting rod 250, and a driving device 300.

[0069] A cylinder cavity 220 is formed inside the cylinder block 210. An air outlet 240 is formed through the end face of the cylinder cavity 220, and the air outlet 240 is communicated with the cylinder cavity 220. The noise reduction structure 100 is installed on the cylinder block 210. A piston 230 is arranged inside the cylinder cavity 220. The piston 230 can move in the cylinder cavity 220. The connecting rod 250 is installed and connected with the piston 230, and the end of the connecting rod 250 away from the piston 230 is located outside the cylinder cavity 220. The driving device 300 is installed and connected with the connecting rod 250, and the driving device 300 is used to drive the piston 230 to move in the cylinder cavity 220.

[0070] Refer to Figure 1 、 Figure 2 and Figure 6 As shown, the power from the driving device 300 is transmitted to the piston 230 through the connecting rod 250, enabling the piston 230 to perform reciprocating motion in the cylinder cavity 220, thereby realizing exhaust. Specifically, the gas in the cylinder cavity 220 is discharged through the gas path channel composed of the air outlet 240, the avoidance groove 153, and the air outlet pipe 154. Specifically, the elastic piece 120 cooperates with the air outlet 240 to realize the one-way exhaust function, that is, the gas in the cylinder cavity 220 can only be discharged through the air outlet 240, and the gas cannot enter the cylinder cavity 220 through the air outlet 240. In order to continuously realize exhaust, an intake one-way valve (not shown in the figure) is further installed on the cylinder block 210, that is, after the exhaust is completed, the gas enters the cylinder cavity 220 through the intake one-way valve to prepare for the next exhaust.

[0071] Refer to Figure 2As shown, in this embodiment, the piston 230 moves upward to compress the gas in the cylinder chamber 220. At this time, the cover plate 123 is subjected to the pressure of the gas in the cylinder chamber 220, and thus is opened upward at a certain angle for exhaust, relieving the blockage of the air outlet 240, so that the compressed gas is discharged through the air outlet 240 and finally conveyed to a predetermined pipeline or device through the air outlet pipe 154; when the piston 230 moves downward, the cylinder chamber 220 is in negative pressure at this time, and the external gas enters the cylinder chamber 220 through the intake check valve. During this process, the cover plate 123 returns to its initial state, that is, the cover plate 123 blocks the air outlet 240 at this time; repeating the above operations continuously realizes the function of continuous external exhaust.

[0072] The driving device 300 includes a mounting frame 310 installed on the cylinder block 210. A gear set 320 is rotatably installed on the mounting frame 310, and a rotary driving member 330 is fixedly installed. The rotary driving member 330 is used to drive the gear set 320 to rotate, and the gear set 320 is connected to the connecting rod 250.

[0073] Refer to Figure 6 As shown, in order to enable the piston 230 to reciprocate up and down in the cylinder chamber 220, that is, to continuously compress the gas for exhaust, the driving device 300 is used as the power source to drive the piston 230 to reciprocate through the transmission of the connecting rod 250.

[0074] In this embodiment, the gear set 320 includes a small gear and a large gear. The small gear is meshed and connected with the large gear. The large gear is rotatably installed on the mounting frame 310. The small gear is installed on the driving shaft of the rotary driving member 330. The large gear is rotatably installed with the connecting rod 250. Specifically, the installation point of the large gear and the connecting rod 250 is not coaxial with the large gear. Therefore, the connecting rod 250 can be reciprocally driven, and further the piston 230 is driven to reciprocate in the cylinder chamber 220.

[0075] In this embodiment, the rotary driving member 330 is a motor.

[0076] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0077] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present application.

Claims

1. A noise reduction structure is installed on an air pump (200), and the air pump (200) has an air outlet (240), characterized in that, The noise reduction structure includes: A positioning member (110) disposed on the plane where the air outlet (240) is located; A resilient piece (120) having a positioning hole (130) formed therein, and the positioning member (110) passes through the positioning hole (130); An elastic member (140) disposed on the outer periphery of the air outlet (240), and the resilient piece (120) abuts against the surface of the elastic member (140); An exhaust member (150) fixedly installed on the air pump (200), and both the resilient piece (120) and the elastic member (140) are located inside the exhaust member (150).

2. The noise reduction structure according to claim 1, wherein An installation groove (160) is formed on the plane where the air outlet (240) is located, and the elastic member (140) is installed in the installation groove (160), and a part of the elastic member (140) protrudes from the installation groove (160).

3. The noise reduction structure according to claim 1, wherein The number of the positioning members (110) is N, and the number of the positioning holes (130) is M, satisfying: N = M ≥ 2.

4. The noise reduction structure according to claim 1, wherein The resilient piece (120) includes an installation piece (121), the positioning hole (130) is formed through the installation piece (121), elastic arms (122) are provided on the inner hole wall of the installation piece (121), and a cover plate (123) is provided on the elastic arms (122), and the cover plate (123) is larger than the air outlet (240).

5. The noise reduction structure according to claim 4, characterized in that, The end face of the installation piece (121), the end face of the elastic arms (122), and the end face of the cover plate (123) are located on the same plane.

6. The noise reduction structure according to claim 1, wherein, A sealing member (170) is provided between the exhaust member (150) and the plane where the air outlet (240) is located.

7. The noise reduction structure according to claim 1, characterized in that The exhaust member (150) includes an installation cover (151), a receiving groove (152) is formed on the end face of the installation cover (151) close to the air outlet (240) direction, an avoidance groove (153) is formed on the end face of the receiving groove (152) away from the air outlet (240), and an air outlet pipe (154) is provided on the outer wall of the installation cover (151), and the air outlet pipe (154) communicates with the avoidance groove (153).

8. The noise reduction structure according to claim 7, wherein At least one guiding groove (155) is formed on the outer surface of the installation cover (151).

9. An air pump, characterized in that, The air pump (200) includes: A cylinder block (210) having a cylinder cavity (220) formed therein, an air outlet (240) is formed through the end face of the cylinder cavity (220), and the air outlet (240) communicates with the cylinder cavity (220); A noise reduction structure (100), and the noise reduction structure (100) according to any one of claims 1 to 8 is installed on the cylinder block (210); A piston (230) is disposed inside the cylinder cavity (220), and the piston (230) can move in the cylinder cavity (220); A connecting rod (250) is installed and connected to the piston (230), and the end of the connecting rod (250) away from the piston (230) is located outside the cylinder cavity (220); A driving device (300), the driving device (300) is installed and connected to the connecting rod (250), and the driving device (300) is used to drive the piston (230) to move in the cylinder cavity (220).

10. The air pump according to claim 9, characterized in that, The driving device (300) includes a mounting frame (310) mounted on the cylinder block (210), a gear set (320) is rotatably mounted on the mounting frame (310), and a rotary driving member (330) is fixedly mounted. The rotary driving member (330) is used to drive the gear set (320) to rotate, and the gear set (320) is connected to the connecting rod (250).

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