Low noise air pump

Abstract

The application discloses a low-noise air pump and relates to the technical field of air pumps.The air pump comprises a motor, an air pump assembly, an upper shell assembly and a lower shell assembly; the lower shell assembly is formed with a containing cavity for containing the air pump assembly; the motor is arranged on the lower shell assembly and is suitable for driving the air pump assembly to act; the air pump assembly comprises a leather cup assembly, a leather cup frame and an eccentric wheel; the leather cup assembly is arranged on the leather cup frame; the leather cup frame is rotatably arranged on the eccentric wheel; and the eccentric wheel is connected with the motor; the eccentric wheel comprises a main body portion; a first mounting hole is arranged at one end of the main body portion close to the motor; a second mounting hole is arranged at one end of the main body portion close to the leather cup frame; an extension portion is formed on one side of the main body portion away from the second mounting hole; and a third mounting hole is arranged on the extension portion; and the technical scheme provided by the application reduces the fluctuation range of the centrifugal force of the eccentric wheel through the balancing effect of the counterweight, thereby reducing the vibration noise.

Description

Technical Field

[0001] This application relates to the field of air pump technology, and in particular to a low-noise air pump. Background Technology

[0002] As a general-purpose power device that converts mechanical energy into gas pressure energy, air pumps are widely used in various fields. The stability, noise level and energy consumption during operation directly determine the user experience and suitable scenarios. However, most mainstream air pumps on the market currently have excessive noise in actual operation, which seriously limits their application in sensitive scenarios. One of the factors that generate noise is the vibration noise generated by the power transmission system.

[0003] Most existing air pumps adopt a transmission structure of "motor-eccentric wheel-cup holder". The motor drives the eccentric wheel to rotate, which in turn drives the cup holder and cup assembly to reciprocate, realizing the intake and exhaust of the air chamber. However, the traditional eccentric wheel design only focuses on the transmission function and generally lacks dynamic balance optimization. When the eccentric structure of the main body of the eccentric wheel rotates at high speed, it is prone to violent periodic vibration due to uneven centrifugal force, which in turn generates corresponding noise. Utility Model Content

[0004] The purpose of this application is to provide a low-noise air pump to solve at least one of the above-mentioned technical problems.

[0005] To solve the above-mentioned technical problems, this application provides a low-noise air pump, including a motor, an air pump assembly, an upper housing assembly, and a lower housing assembly; the lower housing assembly forms a receiving cavity for accommodating the air pump assembly, the motor is disposed on the lower housing assembly and adapted to drive the air pump assembly to operate, and the upper housing assembly is disposed at the end of the lower housing assembly away from the motor; The air pump assembly includes a cup assembly, a cup holder, and an eccentric wheel. The cup assembly is mounted on the cup holder, the cup holder is rotatably mounted on the eccentric wheel, and the eccentric wheel is connected to the motor. The eccentric wheel includes a main body, a first mounting hole at the end of the main body near the motor, a second mounting hole at the end of the main body near the leather cup holder, an extension portion extending from the side of the main body away from the second mounting hole, and a third mounting hole on the extension portion. The line connecting the second mounting hole and the third mounting hole intersects the axis of the first mounting hole. The first mounting hole is connected to the drive end of the motor, the second mounting hole is connected to the leather cup holder, and a counterweight is provided on the third mounting hole. In the above implementation process, the first mounting hole of the main body of this solution is precisely connected to the motor drive end to ensure the coaxiality of power transmission and reduce the eccentric vibration between the motor and the eccentric wheel; the second mounting hole connects to the cup holder to ensure that the eccentric wheel can stably drive the cup holder to reciprocate when rotating, avoiding impact noise caused by transmission gaps; and the counterweights on the extension and the third mounting hole, in conjunction with the layout that "the line connecting the second and third mounting holes intersects the axis of the first mounting hole", can accurately counteract the centrifugal force when the eccentric wheel rotates. Traditional eccentric wheels, due to the lack of dynamic balance design, will generate unbalanced centrifugal force when rotating at high speed, causing the cup holder to shake violently; this solution reduces the fluctuation amplitude of centrifugal force through the balancing effect of the counterweights, thereby reducing vibration noise.

[0006] Preferably, the counterweight includes a counterweight block and a locking member. A mounting shaft is formed on the counterweight block, and an external thread adapted to the locking member is formed on the outer wall of the end of the mounting shaft. The mounting shaft is adapted to pass through the third mounting hole, and the locking member is used to fix the mounting shaft. In the above implementation process, the counterweight in this solution passes through the third mounting hole via a mounting shaft. The external thread at the end of the mounting shaft is compatible with the locking component, which enables precise positioning and secure fixing of the counterweight. The presence of the locking component prevents the mounting shaft from loosening due to centrifugal force when the eccentric wheel rotates at high speed, ensuring the long-term stable operation of the counterweight and eliminating equipment failures and noise caused by the counterweight falling off. From a maintenance perspective, if the counterweight wears out or its dynamic balance is disrupted after long-term use of the air pump, it is not necessary to replace the entire eccentric wheel. Only the locking component needs to be disassembled, the counterweight replaced, or its position readjusted, effectively reducing maintenance costs.

[0007] Preferably, the lower housing assembly is provided with a first air guide shaft and a second air guide shaft along the axial direction of the motor drive shaft toward the motor side. A first air guide hole communicating with the accommodating cavity is formed on the first air guide shaft, and a second air guide hole communicating with the accommodating cavity is formed on the second air guide shaft. The diameter of the first air guide hole is larger than that of the second air guide hole. In the above implementation process, the air guiding structure of traditional air pumps is mostly a single air guiding hole, and the position is arbitrary. When the single air guiding hole is blocked, the path is completely closed. In this solution, an additional air guiding hole is added on the basis of the single air guiding hole, which can be understood as a main air guiding hole and a secondary air guiding hole. The diameter of the secondary air guiding hole is smaller than that of the main air guiding hole. Under normal conditions, the airflow mainly passes through the main air guiding hole (because the diameter of the secondary air guiding hole is smaller, the resistance is greater, so the airflow relies more on the main air guiding hole). The dual-hole design of this solution can reduce the problem of single hole blockage and achieve a longer effective service life.

[0008] Preferably, the first air guide shaft and the second air guide shaft are arranged diagonally on the lower housing assembly; In the above implementation process, the advantage of the first air guide shaft and the second air guide shaft being diagonally set in this solution is that "airflow is evenly distributed and pressure is balanced": the first and second air guide shafts are located at diagonal positions of the lower shell assembly, and airflow can enter and exit the accommodating cavity from two opposite directions to form "bidirectional airflow circulation"; in addition, the diagonal layout can also optimize the internal space utilization of the lower shell assembly: the air guide shafts are dispersed, avoiding concentrated openings in the same area that would reduce the structural strength of the shell, and the corners do not interfere with the assembly of the motor, resulting in high space utilization.

[0009] Preferably, the upper shell assembly includes a top shell, a middle shell, and a valve plate disposed between the top shell and the middle shell; the top shell is provided with a partition boss on the side near the valve plate, and the partition boss separates the top shell to form a first cavity and a second cavity surrounding the first cavity; An air outlet shaft is provided on the side of the top shell facing away from the valve plate, and a first air outlet hole communicating with the first cavity is formed on the air outlet shaft.

[0010] Preferably, a plurality of air guide columns are provided in the second cavity, and a first air inlet is formed on the air guide column along its axial direction, and the first air inlet is connected to the second cavity.

[0011] Preferably, the valve plate is provided with a first through hole corresponding to the first air inlet, and a first diaphragm is provided on the first through hole, the first diaphragm being adapted to abut against the first air inlet.

[0012] Preferably, the middle shell is provided with a second through hole communicating with the first through hole; the middle shell is also provided with a plurality of third through holes, the valve plate is provided with a fourth through hole corresponding to the third through hole, and a second diaphragm is provided on the fourth through hole, the second diaphragm being adapted to abut against the third through hole; The fourth through hole is connected to the first cavity.

[0013] Preferably, a third cavity is formed between the lower shell assembly and the middle shell, the third through hole communicates with the third cavity, and a fifth through hole is formed on the lower shell assembly to communicate with the third cavity and the accommodating cavity.

[0014] In the above implementation process, the second cavity and the first cavity are spatially separated by a partition boss, which also isolates the airflow. The airflow in the second cavity can enter the first through hole by pushing open the first diaphragm through the first air inlet on the air guide column. After passing through the first through hole, it enters the third cavity through the second through hole on the middle shell. The gas in the third cavity can enter the fourth through hole by pushing open the second diaphragm on the valve plate through the third through hole, and finally enter the first cavity. The gas in the first cavity can be discharged through the first air outlet.

[0015] Compared with the prior art, the beneficial effects of this application are as follows: In this solution, the first mounting hole of the main body is precisely connected to the motor drive end, ensuring the coaxiality of power transmission and reducing the eccentric vibration between the motor and the eccentric wheel; the second mounting hole connects to the cup holder, ensuring that the eccentric wheel can stably drive the cup holder to reciprocate when rotating, avoiding impact noise caused by transmission gaps; and the counterweights on the extension and the third mounting hole, in conjunction with the layout of "the line connecting the second and third mounting holes intersecting the axis of the first mounting hole", can accurately counteract the centrifugal force when the eccentric wheel rotates - traditional eccentric wheels, due to the lack of dynamic balance design, will generate unbalanced centrifugal force when rotating at high speed, causing the cup holder to shake violently; this solution reduces the amplitude of centrifugal force fluctuation through the balancing effect of the counterweights, thereby reducing vibration noise. Attached Figure Description

[0016] 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, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of this application; Figure 2 This is an exploded structural diagram of one embodiment of this application; Figure 3 This is a partial exploded structural diagram of one embodiment of this application; Figure 4 This is a partial structural schematic diagram of one embodiment of this application; Figure 5 This is a schematic diagram of the structure of an eccentric wheel according to one embodiment of this application; Figure 6 This is a schematic diagram of the structure of an eccentric wheel according to one embodiment of this application; Figure 7 A schematic diagram of the structure of a counterweight according to one embodiment of this application; Figure 8 This is a partial structural schematic diagram of the lower shell assembly according to one embodiment of this application; Figure 9 This is a schematic diagram of the top shell structure according to one embodiment of this application; Figure 10 This is a partial structural schematic diagram of one embodiment of this application; The components are as follows: 10. Motor; 20. Air pump assembly; 21. Leather cup assembly; 22. Leather cup holder; 23. Eccentric wheel; 231. Main body; 232. First mounting hole; 233. Second mounting hole; 234. Extension; 235. Third mounting hole; 241. Counterweight; 242. Mounting shaft; 243. Locking element; 30. Upper shell assembly; 31. Top shell; 311. First cavity; 312. Second cavity; 313. 3131 First air outlet; 314 First air inlet; 32 Middle shell; 321 Second through hole; 322 Third through hole; 33 Valve plate; 331 First through hole; 332 First diaphragm; 333 Fourth through hole; 334 Second diaphragm; 40 Lower shell assembly; 41 Receptacle; 42 First air guide shaft; 421 First air guide hole; 43 Second air guide shaft; 431 Second air guide hole. Detailed Implementation

[0018] The following drawings disclose several embodiments of this application. For clarity, many practical details will be described in the following description. However, it should be understood that these practical details should not be used to limit this application. That is, in some embodiments of this application, these practical details are not essential. In addition, for the sake of simplicity, some conventional structures and components will be shown in the drawings in a simple schematic manner.

[0019] It should be noted that all directional indications in the embodiments of this application, such as up, down, left, right, front, back, etc., are only used to explain the relative positional relationship and movement of the components in a specific posture as shown in the attached figure. If the specific posture changes, the directional indication will also change accordingly.

[0020] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and does not specifically refer to any order or sequence, nor is it intended to limit this application. They are merely used to distinguish components or operations described using the same technical terms and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of various embodiments can be combined with each other, but only if they are feasible for those skilled in the art. If a combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0021] To further understand the utility model content, features, and effects of this application, the following embodiments are provided, and detailed descriptions are given below in conjunction with the accompanying drawings: Example

[0022] Existing air pumps mostly adopt a transmission structure of "motor-eccentric wheel-cup holder". The motor drives the eccentric wheel to rotate, which in turn drives the cup holder and cup assembly to reciprocate, realizing the intake and exhaust of the air chamber. However, traditional eccentric wheel designs only focus on the transmission function and generally lack dynamic balance optimization. When the eccentric structure of the eccentric wheel body rotates at high speed, it is prone to severe periodic vibration due to uneven centrifugal force, which in turn generates corresponding noise. To solve the above technical problems, this embodiment provides the following technical solution: For details, please see Figure 1-10 This embodiment provides a low-noise air pump, including a motor 10, an air pump assembly 20, an upper housing assembly 30, and a lower housing assembly 40; the lower housing assembly 40 forms a receiving cavity 41 for accommodating the air pump assembly 20, the motor 10 is disposed on the lower housing assembly 40 and adapted to drive the air pump assembly 20 to operate, and the upper housing assembly 30 is disposed at the end of the lower housing assembly 40 away from the motor 10. Furthermore, the air pump assembly 20 includes a cup assembly 21, a cup holder 22, and an eccentric wheel 23. The cup assembly 21 is mounted on the cup holder 22, and the cup holder 22 is rotatably mounted on the eccentric wheel 23. The eccentric wheel 23 is connected to the motor 10. For details, please see Figure 4-6 The eccentric wheel 23 includes a main body 231. A first mounting hole 232 is provided at the end of the main body 231 near the motor 10, and a second mounting hole 233 is provided at the end of the main body 231 near the leather cup holder 22. An extension 234 is formed on the side of the main body 231 away from the second mounting hole 233. A third mounting hole 235 is provided on the extension 234. The line connecting the second mounting hole 233 and the third mounting hole 235 intersects the axis of the first mounting hole 232. The first mounting hole 232 is connected to the drive end of the motor 10, the second mounting hole 233 is connected to the leather cup holder 22, and a counterweight is provided on the third mounting hole 235. In the above solution, the first mounting hole 232 of the main body 231 is precisely connected to the drive end of the motor 10 to ensure the coaxiality of power transmission and reduce the eccentric vibration between the motor 10 and the eccentric wheel 23; the second mounting hole 233 connects to the cup holder 22 to ensure that the eccentric wheel 23 can stably drive the cup holder 22 to reciprocate when rotating, avoiding impact noise caused by transmission gap; and the counterweights on the extension 234 and the third mounting hole 235, in conjunction with the layout that "the line connecting the second mounting hole 233 and the third mounting hole 235 intersects the axis of the first mounting hole 232", can accurately counteract the centrifugal force when the eccentric wheel 23 rotates - the traditional eccentric wheel 23, due to the lack of dynamic balance design, will generate unbalanced centrifugal force when rotating at high speed, causing the cup holder 22 to shake violently; this solution reduces the fluctuation amplitude of centrifugal force through the balancing effect of the counterweight, thereby reducing vibration noise.

[0023] For details, please see Figure 6The counterweight includes a counterweight block 241 and a locking member 243. A mounting shaft 242 is formed on the counterweight block 241. An external thread that matches the locking member 243 is formed on the outer wall of the end of the mounting shaft 242. The mounting shaft 242 is adapted to pass through the third mounting hole 235. The locking member 243 is used to fix the mounting shaft 242. In the above solution, the counterweight 241 passes through the third mounting hole 235 via the mounting shaft 242. The external thread at the end of the mounting shaft 242 is compatible with the locking component 243, which enables precise positioning and secure fixing of the counterweight 241. The presence of the locking component 243 prevents the mounting shaft 242 from loosening due to centrifugal force when the eccentric wheel 23 rotates at high speed, ensuring the long-term stable operation of the counterweight 241 and preventing equipment failure and noise caused by the counterweight 241 falling off. From a maintenance perspective, if the counterweight 241 wears or its dynamic balance is disrupted after long-term use of the air pump, it is not necessary to replace the entire eccentric wheel 23. Only the locking component 243 needs to be removed, the counterweight 241 replaced, or its position readjusted, effectively reducing maintenance costs.

[0024] For details, please see Figure 8-9 The lower housing assembly 40 is provided with a first air guide shaft 42 and a second air guide shaft 43 along the axial direction of the drive shaft of the motor 10 toward the motor 10. A first air guide hole 421 communicating with the accommodating cavity 41 is formed on the first air guide shaft 42, and a second air guide hole 431 communicating with the accommodating cavity 41 is formed on the second air guide shaft 43. The diameter of the first air guide hole 421 is larger than that of the second air guide hole 431. In the above solutions, the air guiding structure of traditional air pumps is mostly a single air guiding hole, and its position is arbitrary. When this single air guiding hole is blocked, the path is completely closed. In this solution, an additional air guiding hole is added to the single air guiding hole, which can be understood as a main air guiding hole and a secondary air guiding hole. The diameter of the secondary air guiding hole is smaller than that of the main air guiding hole. Under normal conditions, the airflow mainly passes through the main air guiding hole (because the diameter of the secondary air guiding hole is smaller, the resistance is greater, so the airflow relies more on the main air guiding hole). The dual-hole design of this solution can reduce the problem of single-hole blockage and achieve a longer effective service life.

[0025] Furthermore, the first air guide shaft 42 and the second air guide shaft 43 are arranged diagonally on the lower housing assembly 40; In the above scheme, the advantage of the first air guide shaft 42 and the second air guide shaft 43 being diagonally arranged is that they achieve "uniform airflow distribution and pressure balance": the first and second air guide shafts 43 are located at diagonal positions of the lower shell assembly 40, and the airflow can enter and exit the accommodating cavity 41 from two opposite directions, forming a "bidirectional airflow circulation"; in addition, the diagonal layout can also optimize the internal space utilization of the lower shell assembly 40: the air guide shafts are dispersed, avoiding concentrated openings in the same area that would reduce the structural strength of the shell, and the corners do not interfere with the assembly of the motor 10, resulting in high space utilization.

[0026] For details, please see Figure 9-10 The upper shell assembly 30 includes a top shell 31, a middle shell 32, and a valve plate 33 disposed between the top shell 31 and the middle shell 32; a partition boss is provided on the side of the top shell 31 near the valve plate 33, and the partition boss partitions the top shell 31 to form a first cavity 311 and a second cavity 312 surrounding the first cavity 311. Furthermore, an air outlet shaft 3131 is provided on the side of the top shell 31 facing away from the valve plate 33, and a first air outlet hole 313 communicating with the first cavity 311 is formed on the air outlet shaft 3131.

[0027] For details, please see Figure 9 A plurality of air guide columns are provided in the second cavity 312, and a first air inlet 314 is formed on the air guide column along its axial direction. The first air inlet 314 is connected to the second cavity 312.

[0028] Specifically, the valve plate 33 is provided with a first through hole 331 corresponding to the first air inlet 314, and a first diaphragm 332 is provided on the first through hole 331. The first diaphragm is adapted to abut against the first air inlet 314.

[0029] Specifically, the middle shell 32 is provided with a second through hole 321 communicating with the first through hole 331; the middle shell 32 is also provided with a plurality of third through holes 322, the valve plate 33 is provided with a fourth through hole 333 corresponding to the third through hole 322, and a second diaphragm 334 is provided on the fourth through hole 333, the second diaphragm 334 being adapted to abut against the third through hole 322; Furthermore, the fourth through hole 333 is connected to the first cavity 311.

[0030] Specifically, a third cavity is formed between the lower shell assembly and the middle shell 32, and a third through hole 322 communicates with the third cavity. A fifth through hole is formed on the lower shell assembly, which communicates with the third cavity and the accommodating cavity 41.

[0031] In the above scheme, the second cavity 312 and the first cavity 311 are spatially separated by a partition boss, which also isolates the airflow. The airflow in the second cavity 312 can enter the first through hole 331 by pushing open the first diaphragm 332 through the first air inlet 314 on the air guide column. After passing through the first through hole 331, it enters the third cavity through the second through hole 321 on the middle shell 32. The gas in the third cavity can enter the fourth through hole 333 by pushing open the second diaphragm 334 on the valve plate 33 through the third through hole 322. Finally, it enters the first cavity 311. The gas in the first cavity 311 can be discharged through the first air outlet 313.

[0032] The above description is merely a preferred embodiment of this application and is not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application shall fall within the scope of the technical solution of this application.

Claims

1. A low-noise air pump, characterized in that: It includes a motor, an air pump assembly, an upper housing assembly, and a lower housing assembly; the lower housing assembly forms a receiving cavity for accommodating the air pump assembly, the motor is disposed on the lower housing assembly and adapted to drive the air pump assembly to operate, and the upper housing assembly is disposed at the end of the lower housing assembly away from the motor; The air pump assembly includes a cup assembly, a cup holder, and an eccentric wheel. The cup assembly is mounted on the cup holder, the cup holder is rotatably mounted on the eccentric wheel, and the eccentric wheel is connected to the motor. The eccentric wheel includes a main body, a first mounting hole at the end of the main body near the motor, a second mounting hole at the end of the main body near the leather cup holder, an extension portion extending from the side of the main body away from the second mounting hole, a third mounting hole on the extension portion, the line connecting the second mounting hole and the third mounting hole intersecting the axis of the first mounting hole; the first mounting hole is connected to the drive end of the motor, the second mounting hole is connected to the leather cup holder, and a counterweight is provided on the third mounting hole.

2. The low-noise air pump according to claim 1, characterized in that: The counterweight includes a counterweight block and a locking member. A mounting shaft is formed on the counterweight block. An external thread adapted to the locking member is formed on the outer wall of the end of the mounting shaft. The mounting shaft is adapted to pass through the third mounting hole. The locking member is used to fix the mounting shaft.

3. The low-noise air pump according to claim 1, characterized in that: The lower housing assembly is provided with a first air guide shaft and a second air guide shaft along the axial direction of the motor drive shaft toward the motor. A first air guide hole communicating with the accommodating cavity is formed on the first air guide shaft, and a second air guide hole communicating with the accommodating cavity is formed on the second air guide shaft. The diameter of the first air guide hole is larger than that of the second air guide hole.

4. The low-noise air pump according to claim 3, characterized in that: The first air guide shaft and the second air guide shaft are arranged diagonally on the lower shell assembly.

5. The low-noise air pump according to claim 1, characterized in that: The upper shell assembly includes a top shell, a middle shell, and a valve plate disposed between the top shell and the middle shell; the top shell is provided with a partition boss on the side near the valve plate, and the partition boss separates the top shell to form a first cavity and a second cavity surrounding the first cavity; An air outlet shaft is provided on the side of the top shell facing away from the valve plate, and a first air outlet hole communicating with the first cavity is formed on the air outlet shaft.

6. The low-noise air pump according to claim 5, characterized in that: The second cavity is provided with a plurality of air guide columns, and a first air inlet is formed on the air guide column along its axial direction. The first air inlet is connected to the second cavity.

7. The low-noise air pump according to claim 6, characterized in that: The valve plate is provided with a first through hole corresponding to the first air inlet, and a first diaphragm is provided on the first through hole, the first diaphragm being adapted to abut against the first air inlet.

8. The low-noise air pump according to claim 7, characterized in that: The middle shell is provided with a second through hole communicating with the first through hole; the middle shell is also provided with a plurality of third through holes, the valve plate is provided with a fourth through hole corresponding to the third through hole, and a second diaphragm is provided on the fourth through hole, the second diaphragm being adapted to abut against the third through hole; The fourth through hole is connected to the first cavity.

9. The low-noise air pump according to claim 8, characterized in that: A third cavity is formed between the lower shell assembly and the middle shell, and a third through hole communicates with the third cavity. A fifth through hole is formed on the lower shell assembly, which communicates with the third cavity and the accommodating cavity.

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