Miniature air pump

Abstract

The miniature air pump comprises an upper cover, a bottom cover, an air pump assembly and a motor, the upper cover is provided with an air outlet, the bottom cover is provided with an air inlet, the air pump assembly is arranged between the upper cover and the bottom cover and used for connecting or disconnecting an air path between the air outlet and the air inlet, the motor is arranged below the bottom cover, and an output shaft of the motor extends towards the bottom cover. A pump cavity is defined by the air pump assembly and the bottom cover, the bottom cover is provided with a roundabout air inlet channel, one end of the roundabout air inlet channel is communicated with an air inlet air channel, and the other end of the roundabout air inlet channel is communicated with a pump cavity air channel. A large number of tortuous air inlet channels are additionally arranged at the air inlet of the bottom cover, the sound transmission distance is increased, the sound intensity is inversely proportional to the square of the distance, the sound is gradually attenuated in the transmission process, meanwhile, the sound intensity is obviously reduced due to the increase of the transmission distance, and therefore the effects of reducing vibration and reducing noise are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of air pumps, more specifically to a micro air pump. Background Art

[0002] Micro air pumps are mainly used in aromatherapy machines, floor scrubbers and other scenes with high requirements for noise, so noise is an important concern. The gas passage area of ​​the micro air pump's outlet becomes smaller. As the outflow speed increases, in order to maintain balance, the pressure inside the cavity increases accordingly. The leather cup load increases and needs to overcome the pressure movement, resulting in increased friction. The leather cup cannot operate normally under this pressure, and obvious operating noise will be generated. Since sound propagation requires a medium, the umbrella tack closes too quickly, and the upper cover valve plate is ultrasonically welded, only a small part of the noise passes through the outlet, and most of it is transmitted to the air inlet through the swing frame cylinder, resulting in excessive noise and poor user experience.

[0003] Therefore, it is necessary to design a micro air pump that can effectively reduce noise. Utility Model Content

[0004] The utility model aims to overcome the deficiencies of the prior art and provide a micro air pump, aiming to improve the noise reduction effect of the micro air pump.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] The utility model provides a micro air pump, comprising:

[0007] The upper cover is provided with an air outlet;

[0008] bottom cover, provided with air inlet;

[0009] An air pump assembly, disposed between the upper cover and the bottom cover, for connecting or disconnecting the air path between the air outlet and the air inlet;

[0010] A motor is disposed below the bottom cover, wherein an output shaft of the motor extends toward the bottom cover and is connected to the air pump assembly;

[0011] The air pump assembly and the bottom cover define a pump cavity, the bottom cover is provided with a circuitous air inlet passage, one end of the circuitous air inlet passage is connected to the air inlet path, and the other end of the circuitous air inlet passage is connected to the pump cavity path.

[0012] Furthermore, the circuitous air inlet passage is arranged on the bottom surface of the bottom cover, and the air inlet is arranged on the side surface of the bottom cover.

[0013] Furthermore, the detour air intake channel is arranged in a spiral shape, the outermost circle of the detour air intake channel is provided with a gas inlet communicated with the air inlet, and the innermost circle of the detour air intake channel is provided with a gas outlet communicated with the pump chamber.

[0014] Furthermore, a sealing gasket is provided between the bottom cover and the motor.

[0015] Furthermore, a side of the detour air intake passage close to the sealing gasket is in an open state, and after the sealing gasket is installed, the sealing gasket seals the open side of the detour air intake passage.

[0016] Furthermore, the sealing gasket is made of rubber material.

[0017] Furthermore, the air pump assembly includes a valve plate, a leather cup, a cylinder body and a swing frame, the valve plate is arranged below the upper cover, the valve plate is provided with an umbrella, the valve plate is pressed on the top of the leather cup, the leather cup is installed on the cylinder body, the bottom of the leather cup is connected to the swing frame, an eccentric wheel is provided in the pump chamber, the swing frame is eccentrically connected to the eccentric wheel, and the output shaft of the motor extends into the pump chamber and is connected to the eccentric wheel.

[0018] Furthermore, the eccentric wheel is provided with an eccentric hole, the bottom end of the eccentric hole is provided with a steel ball, the top of the steel ball is plugged with a steel needle, and the upper end of the steel needle is connected to the swing frame.

[0019] Furthermore, an air inlet cavity is provided at a position of the upper cover corresponding to the umbrella shank, and the air inlet cavity is provided with at least two guide grooves for guiding the gas to the air outlet.

[0020] Furthermore, an umbrella cover and an umbrella handle are provided on the umbrella shank, and the umbrella handle is arranged at the lower end of the middle part of the umbrella cover, so that the umbrella shank has an umbrella-shaped structure.

[0021] Compared with the prior art, the utility model has the following beneficial effects: a micro air pump, comprising an upper cover, a bottom cover, an air pump assembly and a motor, wherein the upper cover is provided with an air outlet, the bottom cover is provided with an air inlet, the air pump assembly is provided between the upper cover and the bottom cover, and is used to conduct or disconnect the air path between the air outlet and the air inlet, the motor is provided below the bottom cover, the output shaft of the motor extends in the direction of the bottom cover, and is connected to the air pump assembly, the air pump assembly and the bottom cover define a pump cavity, the bottom cover is provided with a circuitous air inlet channel, one end of the circuitous air inlet channel is connected to the air path of the air inlet, and the other end of the circuitous air inlet channel is connected to the air path of the pump cavity. By adding a large number of tortuous circuitous air inlet channels to the air inlet of the bottom cover, the distance of sound propagation is increased, the intensity of sound is inversely proportional to the square of the distance, the sound will gradually attenuate during the propagation process, and the increase in the propagation distance will also significantly reduce the sound intensity, thereby achieving the effect of reducing vibration and noise.

[0022] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the utility model more obvious and easy to understand, the following preferred embodiments are specifically cited and described in detail as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 A schematic diagram of the structure of a micro air pump provided in a specific embodiment of the utility model;

[0025] Figure 2 An exploded view of a micro air pump provided in a specific embodiment of the utility model;

[0026] Figure 3 A schematic diagram of the structure of a bottom cover of a micro air pump provided in a specific embodiment of the utility model;

[0027] Figure 4 The present invention is a schematic diagram of assembling a bottom cover and a sealing gasket in a micro air pump provided in a specific embodiment of the present invention.

[0028] Reference numerals

[0029] 1. Upper cover; 11. Air outlet; 2. Bottom cover; 21. Air inlet; 22. Roundabout air inlet channel; 221. Gas inlet; 222. Gas outlet; 3. Motor; 4. Air pump assembly; 41. Valve plate; 42. Leather cup; 43. Cylinder body; 44. Pendulum frame; 45. Eccentric wheel; 451. Eccentric hole; 46. Steel needle; 47. Steel ball; 48. Umbrella pin; 5. Sealing gasket. DETAILED DESCRIPTION

[0030] The following will be combined with the specific embodiments of the utility model to clearly and completely describe the technical solution of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] It should be understood that when used in this specification and claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or collections thereof.

[0032] It should also be understood that the terms used in the utility model specification are only for the purpose of describing specific embodiments and are not intended to limit the utility model. As used in the utility model specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0033] It should be further understood that the term “and / or” used in the present specification and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0034] like Figure 1-Figure 4 As shown, an embodiment of the utility model provides a micro air pump, including an upper cover 1, a bottom cover 2, an air pump assembly 4 and a motor 2. The upper cover 1 is provided with an air outlet 11, and the bottom cover 2 is provided with an air inlet 21. The air pump assembly 4 is arranged between the upper cover 1 and the bottom cover 2, and is used to connect or disconnect the air path between the air outlet 11 and the air inlet 21. The motor 2 is arranged below the bottom cover 2, and the output shaft of the motor 2 extends toward the bottom cover 2 and is connected to the air pump assembly 4. The air pump assembly 4 and the bottom cover 2 define a pump cavity, and the bottom cover 2 is provided with a detour air inlet channel 22, one end of the detour air inlet channel 22 is connected to the air path of the air inlet 21, and the other end of the detour air inlet channel 22 is connected to the pump cavity air path.

[0035] By adding a large number of tortuous and circuitous air inlet channels 22 to the air inlet 21 of the bottom cover 2, the distance of sound propagation is increased. The intensity of sound is inversely proportional to the square of the distance. The sound will gradually attenuate during the propagation process. At the same time, the increase in propagation distance will also significantly reduce the sound intensity, thereby reducing vibration and noise.

[0036] Furthermore, if Figure 3 As shown, the detour air inlet channel 22 is arranged on the bottom surface of the bottom cover 2, and the air inlet 21 is arranged on the side of the bottom cover 2. The detour air inlet channel 22 is arranged on the bottom surface of the bottom cover 2, which makes full use of the bottom surface area space of the bottom cover 2, saves space, and makes the overall structure of the micro air pump more compact.

[0037] In this embodiment, the number of the air inlet 21 and the number of the air outlet 11 are both one. In other embodiments, the number of the air inlet 21 and the number of the air outlet 11 may be greater than one.

[0038] Furthermore, if Figure 3As shown, the detour air intake channel 22 is arranged in a spiral shape, the outermost circle of the detour air intake channel 22 is provided with a gas inlet port 221 communicating with the air inlet 21, and the innermost circle of the detour air intake channel 22 is provided with a gas outlet 222 communicating with the pump chamber.

[0039] Furthermore, if Figure 2-Figure 4 As shown, a sealing gasket 5 is provided between the bottom cover 2 and the motor 2. Preferably, the sealing gasket 5 is made of rubber material. The side of the detour air intake passage 22 close to the sealing gasket 5 is in an open state. After the sealing gasket 5 is installed, the sealing gasket 5 seals the open side of the detour air intake passage 22. The bottom cover 2 and the motor 2 are locked by screws and other connecting parts to seal the sealing gasket 5 and the bottom cover 2. Since the sealing gasket 5 is made of rubber material, when sound waves propagate through the solid medium of the sealing gasket 5, rubber has good sound absorption performance and can effectively absorb sound waves, so that the energy per unit area is reduced, so that the sound heard will become weak, which plays a role in further noise reduction. At the same time, the sealing gasket 5 can also play a certain shock-absorbing role.

[0040] Furthermore, if Figure 2 As shown, the air pump assembly 4 includes a valve plate 41, a leather cup 42, a cylinder body 43 and a swing frame 44. The valve plate 41 is arranged below the upper cover 1, and an umbrella 48 is arranged on the valve plate 41. The valve plate 41 is pressed on the top of the leather cup 42, and the leather cup 42 is installed on the cylinder body 43. The bottom of the leather cup 42 is connected to the swing frame 44. An eccentric wheel 45 is arranged in the pump chamber, and the swing frame 44 is eccentrically connected to the eccentric wheel 45. The output shaft of the motor 2 extends into the pump chamber and is connected to the eccentric wheel 45. An eccentric hole 451 is arranged on the eccentric wheel 45, and a steel ball 47 is arranged at the bottom end of the eccentric hole 451. A steel needle 46 is inserted at the top of the steel ball 47, and the upper end of the steel needle 46 is connected to the swing frame 44.

[0041] Specifically, the upper cover 1 is provided with an air inlet cavity at a position corresponding to the umbrella 48, and the air inlet cavity is provided with at least two guide grooves for guiding the gas to the gas outlet 11. In this embodiment, the air inlet cavity includes a first air inlet cavity for covering the umbrella 48 and a second air inlet cavity surrounding the periphery of the first air inlet cavity. The first air inlet cavity and the second air inlet cavity are connected through a plurality of connecting grooves so that the gas enters the second air inlet cavity from the first air inlet cavity, and the guide groove is provided on the second air inlet cavity. Through the structural coordination of the first air inlet cavity, the second air inlet cavity, the connecting groove and the guide groove, the gas flow rate of the vacuum pump can be effectively increased.

[0042] The upper end of the eccentric shaft is connected to the swing frame 44. The swing frame 44 is provided with at least two air inlets. A rubber diaphragm is provided at the upper end of the air inlet. A cylinder is provided at a position corresponding to each air inlet on the rubber diaphragm. A rubber valve (not shown in the figure) for covering the air inlet is provided in the cylinder. The cylinder body 43 is arranged between the swing frame 44 and the rubber diaphragm. A through hole is provided at a position corresponding to each cylinder of the cylinder body 43. The cylinder passes through the through hole and is connected to the air inlet correspondingly so that the rubber valve fits tightly on the air inlet. A ventilation position is provided at a position corresponding to each cylinder on the valve plate 41. At least one ventilation hole is provided on the ventilation position. The umbrella 48 covers the ventilation position. A mounting portion is provided at the lower end of the swing frame 44 for connecting the eccentric shaft. In this embodiment, four air inlet holes are provided at the upper end of the swing frame 44, and the air inlet holes are in the shape of a hollow cylinder. Correspondingly, four cylinders are provided on the rubber diaphragm, and the cylinders are in the shape of a cylinder. Four through holes are provided on the cylinder body 43, and the through holes are in the shape of a cylinder. Of course, in other embodiments, more air inlet holes can be provided on the swing frame 44 according to actual needs, and the structures of the rubber diaphragm and the cylinder body 43 can be designed accordingly.

[0043] Furthermore, an umbrella cover and an umbrella handle are provided on the umbrella tee 48, and the umbrella handle is provided at the middle lower end of the umbrella cover, so that the umbrella tee 48 has an umbrella-shaped structure. The size of the umbrella cover matches the size of the ventilation position of the valve plate 41, and a mounting hole for passing the umbrella handle is provided in the middle of the ventilation position, so that the umbrella tee 48 can move up and down relative to the ventilation position.

[0044] During operation, the motor 2 is energized to drive the output shaft of the motor 2 to rotate, and the eccentric wheel 45 rotates synchronously. The eccentric wheel 45 drives the eccentric shaft to move, so that the swing frame 44 and the rubber valve in the rubber diaphragm make reciprocating up and down swinging motions in the cylinder body 43. At this time, air is extracted at the air inlet 21 of the bottom cover 2, and the gas enters the rubber diaphragm through the four air inlet holes in the middle of the swing frame 44 after passing through the circuitous air inlet channel 22. Then the compressed gas passes through the air vents on the valve plate 41, the umbrella 48, the first air inlet cavity, the connecting groove, the second air inlet cavity, the guide groove, and the air outlet 11 in sequence and is discharged.

[0045] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the utility model, and these modifications or replacements should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A micro air pump, characterized in that: include: The upper cover is provided with an air outlet; bottom cover, provided with air inlet; An air pump assembly, disposed between the upper cover and the bottom cover, and used to open or close the air path between the air outlet and the air inlet; A motor is disposed below the bottom cover, wherein an output shaft of the motor extends toward the bottom cover and is connected to the air pump assembly; The air pump assembly and the bottom cover define a pump cavity, the bottom cover is provided with a circuitous air inlet passage, one end of the circuitous air inlet passage is connected to the air inlet path, and the other end of the circuitous air inlet passage is connected to the pump cavity path.

2. A micro air pump according to claim 1, characterized in that: The detour air inlet passage is arranged on the bottom surface of the bottom cover, and the air inlet is arranged on the side surface of the bottom cover.

3. A micro air pump according to claim 1, characterized in that: The detour air intake channel is arranged in a spiral shape, the outermost circle of the detour air intake channel is provided with a gas inlet communicated with the air inlet, and the innermost circle of the detour air intake channel is provided with a gas outlet communicated with the pump chamber.

4. A micro air pump according to claim 1, characterized in that: A sealing gasket is provided between the bottom cover and the motor.

5. A micro air pump according to claim 4, characterized in that: The side of the detour air intake passage close to the sealing gasket is in an open state. After the sealing gasket is installed, the sealing gasket seals the open side of the detour air intake passage.

6. A micro air pump according to claim 5, characterized in that: The sealing pad is made of rubber material.

7. A micro air pump according to claim 1, characterized in that: The air pump assembly includes a valve plate, a leather cup, a cylinder body and a swing frame, the valve plate is arranged below the upper cover, the valve plate is provided with an umbrella, the valve plate is pressed on the top of the leather cup, the leather cup is installed on the cylinder body, the bottom of the leather cup is connected to the swing frame, an eccentric wheel is provided in the pump chamber, the swing frame is eccentrically connected to the eccentric wheel, and the output shaft of the motor extends into the pump chamber and is connected to the eccentric wheel.

8. A micro air pump according to claim 7, characterized in that: The eccentric wheel is provided with an eccentric hole, the bottom end of the eccentric hole is provided with a steel ball, the top of the steel ball is plugged with a steel needle, and the upper end of the steel needle is connected with the swing frame.

9. A micro air pump according to claim 7, characterized in that: An air inlet cavity is provided at a position of the upper cover corresponding to the umbrella shank, and at least two guide grooves for guiding the gas to the air outlet are provided on the air inlet cavity.

10. A micro air pump according to claim 7, characterized in that: An umbrella cover and an umbrella handle are arranged on the umbrella shank, and the umbrella handle is arranged at the middle lower end of the umbrella cover so that the umbrella shank has an umbrella-shaped structure.

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