Air pump device with noise reduction structure

Abstract

The present application belongs to the technical field of air pumps, and particularly relates to an air pump device with a noise reduction structure, aiming to solve the problem that the noise reduction function of an air pump soundproof cover is significantly weakened due to heat dissipation design. The air pump device with the noise reduction structure comprises a soundproof cover, a fan, an air pump body and a noise reduction structure. The soundproof cover is provided with a containing cavity and air inlets and outlets, and the fan and the air pump body are arranged in the containing cavity. The air inlets and the air outlets are both provided with the noise reduction structure, which is provided with a plurality of gas passages, a plurality of expansion cavities are connected in series on the passages, and the maximum flow-through cross-sectional area of the expansion cavities is greater than that of the gas passages. The expansion cavities are wrapped with auxiliary cavities on the outside, and the auxiliary cavities are communicated with the expansion cavities through communication holes. The present application attenuates the middle and low frequency noise by using the impedance mutation of the expansion cavities, and then forms a resonance structure with the auxiliary cavities and the communication holes to realize secondary noise reduction. While ensuring the airflow circulation, heat dissipation effect and normal operation of the air pump, the present application reduces noise overflow and improves the problem that the noise reduction and heat dissipation of the traditional soundproof cover are difficult to be considered simultaneously.

Description

Technical Field

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

[0002] Air pumps generate significant noise during operation. To reduce the impact of this noise on the surrounding environment and equipment, it is common practice to install the air pump inside a soundproof enclosure to achieve noise shielding and thus reduce noise. However, air pumps continuously generate a large amount of heat during operation. If this heat cannot be dissipated to the outside of the soundproof enclosure in time, it will cause the internal temperature of the enclosure to rise abnormally, leading to performance degradation and malfunction of the air pump. In severe cases, it can cause irreversible damage to the air pump, directly affecting its long-term stable operation and service life.

[0003] To address the heat dissipation issue inside the soundproof enclosure, a fan is installed to drive airflow circulation and facilitate heat exchange. Correspondingly, densely packed elongated holes are created on the enclosure's shell. These holes serve as channels for airflow in and out of the enclosure, ensuring effective air circulation driven by the fan. This allows cool external air to enter the enclosure and hot internal air to escape, thus promptly removing the heat generated by the air pump and preventing excessively high internal temperatures, ensuring the air pump maintains normal operating conditions.

[0004] However, the dense, elongated holes created to meet heat dissipation requirements, while ensuring smooth airflow, compromise the integrity of the soundproof enclosure and become the main leakage path for the air pump's operating noise to propagate outwards. Summary of the Invention

[0005] To address the aforementioned problems in the prior art, the present invention provides an air pump device with a noise reduction structure.

[0006] To solve the above-mentioned technical problems, the technical solution provided by the present invention is as follows:

[0007] An air pump device with a noise reduction structure includes: A soundproof enclosure having a receiving cavity and an air inlet and an air outlet communicating with the receiving cavity; A fan, installed in the receiving cavity, is used to drive airflow from the air inlet to the air outlet; The air pump body is installed inside the receiving cavity and located in the airflow path; The noise reduction structure is installed at both the air inlet and the air outlet. The noise reduction structure includes multiple gas channels for connecting the cavity to the external environment; An expansion cavity is connected in series on the gas channel, and the maximum flow cross-sectional area of ​​the expansion cavity is larger than the flow cross-sectional area of ​​the gas channel. An auxiliary cavity is also wrapped around the expansion cavity, and the auxiliary cavity is connected to the expansion cavity through a connecting hole.

[0008] Furthermore, the soundproof cover is integrally formed with the noise reduction structure or is detachably connected.

[0009] Furthermore, both the expansion cavity and the auxiliary cavity are configured as spherical cavities.

[0010] Furthermore, the plurality of the connecting holes are evenly distributed on the wall of the expansion cavity.

[0011] Furthermore, multiple sound-absorbing grooves are formed on the wall surface of the auxiliary cavity away from the expansion cavity.

[0012] Furthermore, the sound-absorbing groove is configured as a hemispherical or cylindrical shape.

[0013] Furthermore, the soundproof enclosure includes: The first housing is equipped with the air pump body and has the air outlet. The second housing is detachably connected to the first housing and encloses it to form the receiving cavity. The second housing is equipped with the fan and has the air inlet.

[0014] Furthermore, the second housing is at least partially inserted into the first housing; The inner wall of the first housing is provided with an annular groove, and the second housing is provided with an annular protrusion that engages with the annular groove.

[0015] Furthermore, the second housing is also provided with a limiting protrusion, which abuts against the end face of the first housing to limit the depth to which the second housing is inserted into the first housing.

[0016] Furthermore, the air pump device with noise reduction structure also includes a shock absorber base, which is used to connect the air pump body and the sound insulation cover. The shock absorber base is made of elastic material.

[0017] In summary, the technical effects achieved by this invention are as follows: The air pump device with a noise reduction structure provided by the present invention includes: a soundproof cover having a receiving cavity and an air inlet and an air outlet communicating with the receiving cavity; a fan installed in the receiving cavity for driving airflow from the air inlet to the air outlet; an air pump body installed in the receiving cavity and located on the airflow path; a noise reduction structure having a noise reduction structure installed at both the air inlet and the air outlet; the noise reduction structure includes multiple gas channels for connecting the receiving cavity and the external environment; an expansion cavity is connected in series on the gas channels, the maximum flow cross-sectional area of ​​the expansion cavity being larger than the flow cross-sectional area of ​​the gas channels; an auxiliary cavity is also wrapped around the outside of the expansion cavity, and the auxiliary cavity is connected to the expansion cavity through a connecting hole.

[0018] The air pump device with noise reduction structure provided by this invention reduces the decrease in noise reduction effect of the soundproof enclosure caused by the opening of air vents by setting noise reduction structures at the air inlet and outlet of the soundproof enclosure. Specifically, by installing noise reduction structures at both the air inlet and outlet, an expansion cavity connected in series on the gas channel is used to initially cancel out low- and mid-frequency noise through impedance abrupt change; an auxiliary cavity wrapped around the outside of the expansion cavity is connected to the expansion cavity through a connecting hole to form a resonant noise reduction structure, which performs secondary noise reduction on residual sound energy, further improving the noise reduction effect. This structure effectively reduces the leakage of air pump operating noise without blocking airflow, ensuring air pump heat dissipation and stable operation. It has a simple structure, high practicality, and solves the problem that traditional soundproof enclosures cannot simultaneously achieve noise reduction and heat dissipation. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of an air pump device with a noise reduction structure provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the noise reduction structure; Figure 3 This is a schematic diagram of the gas channel structure; Figure 4 A three-dimensional schematic diagram of an air pump device with a noise reduction structure; Figure 5 A bottom view of an air pump device with a noise reduction structure; Figure 6 A front view schematic diagram of an air pump device with a noise reduction structure; Figure 7 A schematic diagram of an explosion involving an air pump device with a noise reduction structure; Figure 8 A cross-sectional schematic diagram of an air pump device with a noise reduction structure; Figure 9 Another cross-sectional schematic diagram of an air pump device with a noise reduction structure; Figure 10 This is another cross-sectional schematic diagram of an air pump device with a noise reduction structure.

[0021] Icons: 1. Soundproof enclosure; 101. Receiving cavity; 102. Air inlet; 103. Air outlet; 11. First housing; 12. Second housing; 13. Controller housing; 111. Annular groove; 121. Annular protrusion; 122. Limiting protrusion; 123. Air intake duct; 2. Fan; 3. Air pump body; 4. Noise reduction structure; 41. Gas passage; 42. Expansion cavity; 43. Auxiliary cavity; 44. Connecting hole; 45. Silencing groove; 5. Vibration damping seat; 6. First connector; 7. Second connector; 8. Third connector; 9. Circuit board. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0024] The following is combined Figures 1-10 Some embodiments of the present invention will be described in detail below. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0025] The air pump device with noise reduction structure provided in this embodiment includes a soundproof cover 1, a fan 2, an air pump body 3, and a noise reduction structure 4, such as... Figure 1 As shown. The soundproof enclosure 1 serves as the outer protective layer and sound insulation base for the air pump body 3, forming a relatively enclosed working space and reducing the direct transmission of internal noise to the outside. Specifically, the soundproof enclosure 1 has a receiving cavity 101 for installing the fan 2 and the air pump body 3. The soundproof enclosure 1 also has an air inlet 102 and an air outlet 103 communicating with the receiving cavity 101. The air inlet 102 introduces outside air, providing the airflow required for the air pump body 3 and the fan 2. The air outlet 103 discharges the airflow that has passed through the air pump body 3, ensuring airflow circulation. The air pump body 3 is installed inside the receiving cavity 101 and located in the airflow path, providing a stable air source for the air-using equipment. Optionally, the soundproof enclosure 1 can be made of metal, engineering plastic, or composite sound insulation material. The composite sound insulation material can be a three-layer structure consisting of an outer shell, sound insulation cotton, and an inner shell.

[0026] The fan 2 and the air pump body 3 provide cooling airflow and promote air circulation inside the housing cavity 101, preventing heat buildup generated during operation and ensuring long-term stable operation of the air pump device with noise reduction structure. Optionally, the fan 2 can be an axial fan or a centrifugal fan. The axial fan is suitable for driving airflow in small spaces with large flow rates, while the centrifugal fan is suitable for scenarios requiring higher air pressure. The connection between the fan 2 and the soundproof cover 1 can be fixed with bolts or clips. A buffer pad can be placed at the connection between the fan 2 and the soundproof cover 1 to weaken the vibration transmission generated during operation of the fan 2 and further reduce noise.

[0027] Considering that traditional air pump devices, which rely solely on a soundproof cover 1 with elongated holes as air inlets 102 and outlets 103, are insufficient to effectively block noise, this embodiment incorporates noise reduction structures 4 at both the air inlets 102 and outlets 103 of the soundproof cover 1. Through the multi-stage noise reduction design of these structures 4, targeted control of noise at different frequency bands is achieved. In this embodiment, the noise reduction structure 4 includes multiple gas channels 41. These gas channels 41 connect the accommodating cavity 101 to the external environment, serving as both airflow channels and the primary path for noise propagation. Therefore, the structure of the gas channels 41 needs to be optimized to reduce noise propagation without affecting airflow.

[0028] Specifically, an expansion cavity 42 is connected in series on the gas channel 41, such as... Figure 2 , Figure 3 As shown, the maximum flow cross-sectional area of ​​the expansion cavity 42 is larger than that of the gas channel 41. Its function is to achieve preliminary noise reduction of mid-to-low frequency noise through impedance abrupt change. That is, when the airflow carrying noise enters the larger expansion cavity 42 from the narrow gas channel 41, the acoustic impedance will change suddenly. Most of the mid-to-low frequency sound energy will be reflected and interfered inside the expansion cavity 42, canceling each other out, thereby achieving preliminary attenuation of mid-to-low frequency noise. Optionally, the gas channel 41 can be configured as a bent channel or a straight channel. A bent channel can extend the length of the air path, increase the noise propagation path, and further absorb noise, making it suitable for scenarios with high noise reduction requirements. A straight channel has low airflow resistance, making it suitable for scenarios with high heat dissipation requirements. The number of gas channels 41 can be flexibly set according to the size of the air inlet 102 and the air outlet 103 and the noise reduction requirements. Multiple gas channels 41 can be evenly distributed to ensure uniform airflow and improve the noise reduction effect. The shape of the expansion cavity 42 can be configured as spherical, cylindrical, or square, etc. Among them, the spherical expansion cavity 42 has a high volume utilization rate and a more uniform noise reduction effect, while the cylindrical expansion cavity 42 is easy to process and is easy to mass-produce.

[0029] To further enhance the noise reduction effect of mid-to-low frequency noise and solve the problem of residual sound energy leakage due to incomplete cancellation by the expansion cavity 42, an auxiliary cavity 43 is also wrapped around the outside of the expansion cavity 42, such as... Figure 3As shown, the auxiliary cavity 43 and the expansion cavity 42 are connected by a connecting hole 44. The auxiliary cavity 43 and the expansion cavity 42 work together to form a resonant silencing system, which performs secondary absorption and silencing of residual mid-to-low frequency sound energy that was not eliminated by the expansion cavity 42. Specifically, the residual sound energy inside the expansion cavity 42 is transmitted to the auxiliary cavity 43 through the connecting hole 44. The connecting hole 44 acts as a resonant neck, and the auxiliary cavity 43, as a resonant cavity, will resonate when the noise frequency matches the natural frequency of the resonant system, converting the sound energy into heat energy and further enhancing the silencing amplitude of mid-to-low frequency noise. Furthermore, residual sound energy that was not completely eliminated by the expansion cavity 42 is transmitted to the auxiliary cavity 43 through the connecting hole 44. The sound waves undergo multiple reflections inside the auxiliary cavity 43, prolonging the sound energy propagation path and causing the sound energy to interfere and be lost during reflection, gradually converting into heat energy and achieving secondary silencing. Optionally, the shape of the auxiliary cavity 43 can be configured as a spherical cavity, cylindrical cavity, or square cavity corresponding to the expansion cavity 42. When both the expansion cavity 42 and the auxiliary cavity 43 are configured as spherical cavities, they can be arranged concentrically, resulting in a more compact structure and a more uniform sound attenuation effect. The number of connecting holes 44 can be set according to the size of the expansion cavity 42 and the sound attenuation requirements. Multiple connecting holes 44 are evenly distributed on the wall of the expansion cavity 42, which can allow residual sound energy to be evenly transmitted to the auxiliary cavity 43, avoid local sound energy accumulation, and improve the uniformity of sound attenuation.

[0030] Considering the poor noise reduction effect of traditional noise reduction structure 4 on high-frequency noise, and the ease with which high-frequency noise propagates outward through the wall of auxiliary cavity 43, multiple noise-absorbing grooves 45 are formed on the wall surface of auxiliary cavity 43 away from expansion cavity 42 to weaken the propagation intensity of high-frequency noise. The noise-absorbing grooves 45 increase the surface area of ​​the cavity wall, enhancing the absorption and dissipation of sound energy, causing high-frequency sound energy to be reflected multiple times on the groove surface and gradually consumed, thereby effectively reducing the propagation intensity of high-frequency noise, compensating for the shortcomings of traditional structures in noise reduction, and broadening the frequency coverage of the overall noise reduction structure. Optionally, the noise-absorbing grooves 45 can be set as hemispherical or cylindrical. Hemispherical noise-absorbing grooves 45 are easy to process and can achieve all-round sound energy absorption, while cylindrical noise-absorbing grooves 45 can increase the surface area of ​​the cavity wall and improve the high-frequency noise reduction effect. Obviously, noise-absorbing grooves 45 can be formed on various inner wall surfaces of expansion cavity 42 and auxiliary cavity 43.

[0031] To further enhance high-frequency noise reduction performance and achieve all-round noise reduction protection across the entire frequency band, multiple expansion cavities 42 and auxiliary cavities 43 can be arranged in a staggered manner. The inner walls of each auxiliary cavity 43 form a structural plane that comprehensively covers the air inlet 102 and air outlet 103, creating an air cavity that covers both the air inlet 102 and air outlet 103. The air cavity utilizes the sound insulation effect of the air layer to block high-frequency noise from being emitted outwards. Combined with the multi-stage noise reduction effect of the sound-absorbing wall, this further weakens the propagation of high-frequency noise, forming a multi-stage noise reduction system: initial noise reduction by the expansion cavities 42, secondary noise reduction by the auxiliary cavities 43, high-frequency noise reduction by the noise-absorbing grooves 45, and sound insulation by the air cavity. This achieves comprehensive control of mid-low and high-frequency noise.

[0032] In this embodiment, the noise reduction structure 4 can be manufactured by 3D printing or by lost-wax casting.

[0033] In this embodiment, the soundproof cover 1 includes a first housing 11 and a second housing 12, which are detachably connected and enclose a cavity 101 to facilitate the installation, maintenance, and repair of internal components such as the fan 2 and the air pump body 3. The air pump body 3 is mounted on the first housing 11 and has an air outlet 103 for fixing the air pump body 3; the fan 2 is mounted on the second housing 12 and has an air inlet 102 for fixing the fan 2. Optionally, the detachable connection between the first housing 11 and the second housing 12 can be achieved by snap-fit ​​connection, bolt connection, or insert connection. Snap-fit ​​connection is convenient to install and remove, bolt connection has a firm structure, and insert connection has good sealing performance.

[0034] To improve the sealing and stability of the connection between the first housing 11 and the second housing 12, prevent air leakage and noise overflow, and facilitate control of their assembly precision, the second housing 12 is at least partially inserted into the first housing 11. The inner wall of the first housing 11 is provided with an annular groove 111, and the second housing 12 is provided with an annular protrusion 121 that engages with the annular groove 111. Figure 8 , Figure 9 As shown. The annular protrusion 121 and the annular groove 111 engage to form an annular sealing structure, preventing airflow inside the receiving cavity 101 from leaking through the connection gap between the two, while also preventing internal noise from escaping through the gap, thus improving sound insulation and sealing performance. The annular protrusion 121 is made of an elastic material such as rubber. The elastic material has good deformation capability, which can fill the gap between the annular groove 111 and the annular protrusion 121, further improving the sealing performance. At the same time, it can weaken the vibration transmission between the first housing 11 and the second housing 12, reducing the noise generated by vibration. Optionally, multiple sets of annular grooves 111 and annular protrusions 121 can be provided, evenly distributed along the connection direction of the first housing 11 and the second housing 12. Multiple sets can further improve the sealing performance and connection stability. In addition to rubber, the elastic material can also be silicone, polyurethane, etc.

[0035] In this embodiment, the second housing 12 is further provided with a limiting protrusion 122, which abuts against the end face of the first housing 11 to limit the depth of the second housing 12 inserted into the first housing 11. The limiting protrusion 122 cooperates with the annular protrusion 121 to achieve precise positioning and stable connection of the second housing 12, ensuring that the second housing 12 is not over-inserted after being inserted into place, while ensuring precise engagement between the annular protrusion 121 and the annular groove 111, avoiding sealing failure and noise leakage caused by insertion deviation.

[0036] The air pump body 3 generates severe vibrations during operation. These vibrations not only produce additional noise but also affect the operational stability of the air pump body 3. Long-term vibration may also cause the connection between the air pump body 3 and the soundproof cover 1 to loosen. Therefore, in this embodiment, the air pump device with a noise reduction structure also includes a shock-absorbing base 5, such as... Figure 7 , Figure 9 , Figure 10 As shown, the vibration damping seat 5 is used to connect the air pump body 3 and the soundproof cover 1. It is made of elastic materials such as polyurethane and rubber. The function of the vibration damping seat 5 is to support and limit the air pump body 3, absorb the vibration generated when the air pump body 3 is working, and weaken the vibration transmission. The elastic material has good shock absorption and buffering performance. When the air pump body 3 vibrates, the vibration damping seat 5 will undergo elastic deformation, converting the vibration energy into heat energy and dissipating it, preventing the vibration from being transmitted to the soundproof cover 1, thereby reducing the noise generated by vibration. At the same time, it ensures the stability of the air pump body 3 within the soundproof cover 1, preventing displacement due to vibration and affecting the normal operation of the air pump device with noise reduction structure. Optionally, one end of the vibration damping seat 5 is inserted into the air pump body 3, and the other end is inserted into the soundproof cover 1. To ensure connection stability, the vibration damping seat 5 has two stepped surfaces to limit the insertion depth. The two stepped surfaces abut against the air pump body 3 and the soundproof cover 1 respectively, further improving the connection stability. Specifically, the vibration damping seat 5 is set as a stepped shaft with three sections. The diameter of the middle section is larger than the diameters of the two ends to form two stepped surfaces. Multiple shock absorber seats 5 can be installed to ensure reliable support and improve the shock absorption effect.

[0037] In this embodiment, the air pump device with noise reduction structure also includes a circuit board 9, such as Figure 7 , Figure 9 As shown, circuit board 9 is used to control the start / stop and speed adjustment of the air pump and fan 2, ensuring that the air pump device with noise reduction structure can work flexibly according to actual needs. The soundproof enclosure 1 also includes a controller housing 13, which is inserted into the second housing 12. Circuit board 9 is installed inside the controller housing 13, which provides protection for circuit board 9. The connection between circuit board 9 and controller housing 13 can be secured by bolts or clips.

[0038] When using the controller housing 13 and circuit board 9, the structure of the controller housing 13 being inserted into the second housing 12 would cause the controller housing 13 to block the air inlet 102 on the second housing 12, affecting the airflow into the receiving cavity 101. Therefore, an air inlet duct 123 is opened on the side wall of the second housing 12, and the air inlet duct 123 communicates with the receiving cavity 101 to allow airflow to enter. Specifically, the air inlet duct 123 is located between the noise reduction structure 4 and the circuit board 9.

[0039] Considering that the air pump body 3 will vibrate during operation, the vibration damping seat 5 alone cannot completely limit its displacement. Long-term vibration may cause excessive deformation of the vibration damping seat 5, affecting the positional stability of the air pump body 3. At the same time, the connection between the controller housing 13 and the second housing 12 needs to be sufficiently robust to prevent loosening during operation. Therefore, the air pump device with a noise reduction structure also includes a first connecting member 6, a second connecting member 7, and a third connecting member 8 to further improve the connection stability of each component. Figure 6 , Figure 7 As shown. The first connecting piece 6 has a U-shaped structure and forms an annular part with the second connecting piece 7. The two are connected by a snap-fit ​​method. The annular part is sleeved on the air pump body 3 and located between the air pump body 3 and the soundproof cover 1. Its function is to limit the displacement of the air pump body 3, prevent excessive deformation of the shock absorber 5, and provide stable support for the air pump body 3. When the air pump body 3 vibrates significantly, the annular part contacts the soundproof cover 1, which can prevent it from displacing significantly and prevent the shock absorber 5 from being damaged due to excessive deformation. Optionally, the snap-fit ​​method of the first connecting piece 6 and the second connecting piece 7 can be a combination of a buckle and a slot. The buckle is set on the first connecting piece 6, and the slot is set on the second connecting piece 7. The snap-fit ​​is convenient and the connection is firm. The first connecting piece 6 and the second connecting piece 7 can be made of sheet metal. Sheet metal parts have high strength and are easy to process. They can be flexibly processed according to the size of the air pump body 3. Alternatively, engineering plastic parts can be used, which are lightweight and low in cost, making them suitable for lightweight air pump devices.

[0040] In this embodiment, the third connector 8 is used to connect the second housing 12 and the controller housing 13, ensuring a firm connection between the controller housing 13 and the second housing 12, preventing the controller housing 13 from loosening or shifting during operation, and ensuring the working stability of the circuit board 9. The third connector 8 is connected to the second housing 12 and the controller housing 13 respectively by bolts. The bolt connection structure is firm and detachable, facilitating the installation, maintenance, and repair of the controller housing 13. The third connector 8 can be made of sheet metal.

[0041] The air pump device with noise reduction structure provided in this embodiment solves the problems of severe noise leakage and difficulty in balancing heat dissipation and noise reduction during the operation of traditional air pumps through the coordinated cooperation of various components. It achieves the dual effects of full-band noise control and stable heat dissipation, while also possessing the advantages of compact structure and strong practicality. Specifically, the noise reduction effect is significantly improved, achieving full-band coverage. Through the impedance change silencing of the expansion cavity 42, most of the mid- and low-frequency sound energy is efficiently canceled, solving the problem of severe mid- and low-frequency noise leakage in traditional structures. Then, secondary noise reduction is achieved through the resonance system formed by the auxiliary cavity 43, which specifically treats the residual harmonics of mid- and low-frequency frequencies. Combined with the sound-absorbing grooves 45 set on the auxiliary cavity 43 and the sound-absorbing walls and air cavities formed by staggered arrangement, high-frequency noise propagation is effectively weakened. At the same time, the heat dissipation function is not affected, ensuring the stable operation of the air pump. The optimized structure only modifies the structure of the gas channel 41 without blocking the airflow path. The fan 2 can still drive the airflow circulation normally, ensuring that the heat dissipation requirements of the air pump are met.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An air pump device with a noise reduction structure, characterized in that, include: The soundproof cover (1) has a receiving cavity (101) and an air inlet (102) and an air outlet (103) communicating with the receiving cavity (101). A fan (2) is installed in the receiving cavity (101) to drive airflow from the air inlet (102) to the air outlet (103); The air pump body (3) is installed in the receiving cavity (101) and located in the airflow path; The noise reduction structure (4) is installed on both the air inlet (102) and the air outlet (103). The noise reduction structure (4) includes multiple gas channels (41) for connecting the cavity (101) and the external environment. An expansion cavity (42) is connected in series on the gas channel (41), and the maximum flow cross-sectional area of ​​the expansion cavity (42) is greater than the flow cross-sectional area of ​​the gas channel (41). An auxiliary cavity (43) is also wrapped around the outside of the expansion cavity (42), and the auxiliary cavity (43) is connected to the expansion cavity (42) through a connecting hole (44).

2. The air pump device with a noise reduction structure according to claim 1, characterized in that, The soundproof cover (1) and the noise reduction structure (4) are integrally formed or detachably connected.

3. The air pump device with a noise reduction structure according to claim 1, characterized in that, Both the expansion cavity (42) and the auxiliary cavity (43) are configured as spherical cavities.

4. The air pump device with a noise reduction structure according to claim 3, characterized in that, The multiple connecting holes (44) are evenly distributed on the wall of the expansion cavity (42).

5. The air pump device with a noise reduction structure according to claim 1, characterized in that, The auxiliary cavity (43) has multiple sound-absorbing grooves (45) on its wall surface away from the expansion cavity (42).

6. The air pump device with a noise reduction structure according to claim 5, characterized in that, The sound-absorbing groove (45) is configured as a hemispherical or cylindrical shape.

7. The air pump device with a noise reduction structure according to claim 1, characterized in that, The soundproof enclosure (1) includes: The first housing (11) is equipped with the air pump body (3) and has the air outlet (103). The second housing (12) is detachably connected to the first housing (11) and surrounds it to form the receiving cavity (101). The second housing (12) is equipped with the fan (2) and has the air inlet (102).

8. The air pump device with a noise reduction structure according to claim 7, characterized in that, The second housing (12) is at least partially inserted into the first housing (11); The inner wall of the first housing (11) is provided with an annular groove (111), and the second housing (12) is provided with an annular protrusion (121) that engages with the annular groove (111).

9. The air pump device with a noise reduction structure according to claim 8, characterized in that, The second housing (12) is also provided with a limiting protrusion (122), which abuts against the end face of the first housing (11) to limit the depth of the second housing (12) inserted into the first housing (11).

10. The air pump device with a noise reduction structure according to claim 1, characterized in that, It also includes a shock absorber (5), which is used to connect the air pump body (3) and the soundproof cover (1), and the shock absorber (5) is made of elastic material.

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