CN211852126U

CN211852126U - Miniature air pump

Info

Publication number: CN211852126U
Application number: CN202020145048.2U
Authority: CN
Inventors: 许清香
Original assignee: Xiamen Keji Precision Equipment Co ltd
Current assignee: Xiamen Keji Precision Equipment Co ltd; Xiamen Koge Micro Tech Co Ltd
Priority date: 2019-12-13
Filing date: 2020-01-22
Publication date: 2020-11-03
Anticipated expiration: 2030-01-22
Also published as: CN111173723A; CN111255669A; CN111173723B; CN211852124U; CN211852123U; CN111255669B

Abstract

The utility model discloses a miniature air pump, include: the diaphragm is provided with a plurality of capsule bodies on one side, and the capsule bodies form a capsule cavity which is opened towards the other side of the diaphragm; the bag seat is provided with a plurality of bag openings penetrating through the thickness of the bag seat, the diaphragm is attached to the bag seat, the plurality of bag bodies respectively penetrate through the bag openings, and the bag seat is provided with an air inlet channel; the driving part, the driving part has motor cabinet and motor, the motor cabinet be equipped with the axle complex shaft hole of motor, the pore wall in shaft hole is equipped with the groove cave, the bag seat is connected on the motor cabinet, bag seat and diaphragm construct out the air chamber, the bottom of motor cabinet is equipped with air inlet channel, air chamber and air inlet channel intercommunication. According to the utility model discloses miniature air pump sets up the groove cave through the pore wall in the shaft hole, can reduce the air current and flow the noise and in time outwards spill the heat that the axle operation of motor produced to reduce the work noise of miniature air pump, prolong its life.

Description

Miniature air pump

This application is filed based on and claims priority from "chinese patent applications No. 201911280686.3 and No. 201922241927.5, which are hereby incorporated by reference in their entirety.

Technical Field

The utility model relates to a pump technical field, more specifically relates to a miniature air pump.

Background

In the related art, the working noise of the micro air pump is high, and the heat generated inside the air pump cannot be effectively dissipated outside in time, which affects the service life of the micro air pump.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of above-mentioned technical problem to a certain extent at least.

Therefore, the utility model provides a miniature air pump, this miniature air pump noise is low and long service life.

The utility model discloses miniature air pump, include: the diaphragm is provided with a plurality of capsule bodies on one side, and the capsule bodies form a capsule cavity which is opened towards the other side of the diaphragm; the bag seat is provided with a plurality of bag openings penetrating through the thickness of the bag seat, the diaphragm is attached to the bag seat, the bag bodies respectively penetrate through the bag openings, and the bag seat is provided with an air inlet channel; the driving part, the driving part has motor cabinet and motor, the motor cabinet be equipped with the axle complex shaft hole of motor, the pore wall in shaft hole is equipped with the groove cave, the bag seat connect in on the motor cabinet, the motor cabinet the bag seat with the air outlet chamber is established to the diaphragm, the bottom of motor cabinet is equipped with the inlet channel, the air chamber with the inlet channel intercommunication.

According to the utility model discloses miniature air pump sets up the groove cave through the pore wall in the shaft hole, can reduce the air current and flow the noise and in time outwards spill the heat that the axle operation of motor produced to reduce the work noise of miniature air pump, prolong its life.

In addition, according to the utility model discloses miniature air pump can also have following additional technical characterstic:

in some embodiments of the present invention, the groove cavity is formed by sinking from top to bottom, the depth of the shaft hole is h1, the depth of the groove cavity is h2, and h2 is smaller than h 1.

In an alternative embodiment, the plurality of slot pockets surround a shaft of the motor.

In some embodiments of the present invention, the inlet of the inlet runner is disposed in one radial direction of the motor base, the outlet of the inlet runner is disposed in another radial direction of the motor base, and the outlet of the inlet runner is communicated with the air chamber.

In an optional embodiment, a plurality of buffer flow channels are arranged on the inlet flow channel, and the buffer flow channels are distributed along two sides of the inlet flow channel.

In a further optional embodiment, the micro air pump further includes: the pump body comprises a valve seat and a pump cover which are overlapped, the valve seat is overlapped on the diaphragm, the valve seat and the pump cover form an air outlet cavity and a spring cavity which are independent of each other, an air outlet channel is arranged on the valve seat and is communicated with the bag cavity, the valve seat, the diaphragm and the bag seat form a backflow channel which is communicated with each other, and the backflow channel is communicated with the air inlet channel and is not communicated with the spring cavity; the air inlet valve is arranged in the flow direction of the air inlet channel and is used for conducting the bag cavity and the air inlet channel in a one-way mode; the air outlet valve is arranged in the flowing direction of the air outlet channel and is used for conducting the air outlet cavity and the bag cavity in a one-way mode; the pressure relief valve is arranged in the air outlet cavity and used for selectively communicating the backflow channel and the air outlet cavity; the pre-pressing assembly is arranged in the spring cavity and comprises a spring, and the spring applies pre-pressing force to the pressure release valve.

In a further optional example, the air outlet valve and the pressure release valve are integrally formed on a valve membrane, the pressure release valve is formed on one side, facing the valve seat, of the valve membrane, a groove is formed in the valve seat, and a communication hole for communicating the groove and the air outlet cavity is formed in the valve membrane.

Further optionally, the pressure relief valve is an annular lip surrounding the inlet of the return passage, and the annular lip abuts against the valve seat.

Further optionally, the groove comprises: the annular groove and be radially distribute in the circumferential bar groove of annular groove, the free end in bar groove with the intercommunicating pore sets up relatively.

Further optionally, the other side of valve membrane is equipped with the locating lever, pre-compaction subassembly still includes: the spring seat, the locating lever wears to establish the spring seat, the one end butt of spring in the spacing inslot that the spring seat was injectd.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a cross-sectional view of a micro air pump according to some embodiments of the present invention;

FIG. 2 is an enlarged view at A in FIG. 1;

FIG. 3 is an exploded view of a micro air pump according to some embodiments of the present invention;

FIG. 4 is a top view of the motor mount of FIG. 1;

FIG. 5 is a perspective view of the motor mount of FIG. 1;

FIG. 6 is a bottom view of the motor mount of FIG. 1;

FIG. 7 is another angled cross-sectional view of a micro air pump according to some embodiments of the present invention;

reference numerals:

a micro air pump 100;

a diaphragm 10; a balloon body 11; a capsule cavity 111;

a capsule seat 20; a bag mouth 21; an intake passage 22; a sink tank 23;

a valve seat 31; an air outlet passage 311; an annular groove 3121; a strip groove 3122;

a pump cover 32; a guide lumen 321; an air outlet cavity 33; a spring cavity 34; a return channel 35;

an intake valve 40;

a valve film 50; an air outlet valve 51; a pressure relief valve 52; a communication hole 53; a positioning rod 54;

a spring 71; a spring seat 72; a limiting groove 721; a stopper 73;

a valve cover 80; a buffer chamber 81;

a check valve 90;

a driving section 201;

a motor base 202; a shaft hole 2021; a well 20211;

a motor 203; a shaft 2031;

an air chamber 204;

an intake runner 205; an inlet 2051; an outlet 2052; a buffer runner 2053.

Detailed Description

Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

Referring now to fig. 1-6, a micro air pump 100 according to some embodiments of the present invention will be described.

The micro air pump 100 includes a diaphragm 10, a bag holder 20, and a driving part 201.

One side of the diaphragm 10 has a plurality of capsule bodies 11, and the capsule bodies 11 form a capsule cavity 111 which is open towards the other side of the diaphragm 10, as shown in fig. 1 and 3, the diaphragm 10 is approximately in a flat plate structure, and the flat plate structure is sunken downwards to form a plurality of capsule cavities 111 which are open upwards.

The bag seat 20 is provided with a plurality of bag openings 21 penetrating through the thickness of the bag seat, the diaphragm 10 is attached to the bag seat 20, the plurality of bag bodies 11 respectively penetrate through the bag openings 21, and the bag seat 20 is provided with an air inlet channel 22. The airflow may enter the bladder cavity 111 through the intake passage 22. Generally, a cavity 111 corresponds to an inlet valve 40 and an outlet valve 51, and when the cavity 111 pumps gas, one of the inlet valve 40 and the outlet valve 51 is opened, and the other is closed, so that the process of inhaling or exhausting the cavity 111 is realized. The principle of the micro gas pump 100 to pump gas is known to those skilled in the art and will not be described in detail herein.

As shown in fig. 1 to 4, the driving portion 201 includes a motor base 202 and a motor 203, the motor base 202 has a shaft hole 2021 engaged with a shaft 2031 of the motor 203, a groove hole 20211 is formed on a hole wall of the shaft hole 2021, the bag base 20 is connected to the motor base 202, the bag base 20 and the diaphragm 10 form an air outlet chamber 204, an air inlet channel 205 is formed at a bottom of the motor base 202, and the air outlet chamber 204 is communicated with the air inlet channel 205.

The pocket 20211 may reduce noise from the airflow as it enters the plenum 204 through the intake runner 205, and heat generated by the shaft 2031 of the motor 203 may dissipate outward through the pocket 20211. Wherein the cross-section of the pocket 20211 may be at least one of U-shaped, V-shaped, trapezoidal, or honeycomb-shaped.

In short, according to the embodiment of the present invention, the groove 20211 is disposed on the hole wall of the shaft hole 2021, so that the flowing noise of the air flow and the heat generated by the operation of the shaft 2031 of the motor 203 can be reduced to be dissipated outwards, thereby reducing the working noise of the micro air pump 100 and prolonging the service life thereof.

In an alternative embodiment, the cavity 20211 is recessed from the top to the bottom, the height of the shaft hole 2021 is h1, the height of the cavity 20211 is h2, and h2 is smaller than h 1. That is, the groove 20211 does not penetrate the wall thickness of the shaft hole 2021, and the lower end of the groove 20211 is closed.

Further alternatively, the slot pockets 20211 have a plurality of the slot pockets 20211 surrounding the shaft 2031 of the motor 203. Thereby, the groove 20211 can be made to have noise reduction and heat reduction effects.

In some embodiments, as shown in fig. 5 in conjunction with fig. 6, the inlet 2051 of the inlet conduit 205 is disposed in one radial direction of the motor base 202, the outlet 2052 of the inlet conduit 205 is disposed in the other radial direction of the motor base 202, and the outlet 2052 of the inlet conduit 205 is in communication with the plenum 204. That is, the outside airflow does not enter the air chamber 204 vertically upward from the bottom of the motor base 202, but enters the air chamber 204 after at least wrapping a section along the circumference of the motor base 202.

In a further alternative example, the inlet 2051 of the intake runner 205 is angled between 90 and 150 from the outlet 2052 of the intake runner 205. For example, 90 °, 100 °, 110 °, 120 °, 130 °, 140 °, and 150 °.

In one specific example, as shown in fig. 6, a plurality of buffer runners 2053 are provided on the intake runner 205, and the buffer runners 2053 are distributed along two sides of the intake runner 205. That is, a part of the intake airflow can be dispersed into the buffer runner 2053, so that the flow speed of the intake airflow is slowed down, and the airflow flowing noise is reduced.

Referring now to fig. 1, 3 and 7, a micro air pump 100 according to further embodiments of the present invention will be described.

The micro air pump 100 comprises a diaphragm 10, a bag seat 20, a pump body, an air inlet valve 40, an air outlet valve 51, a pressure relief valve 52 and a pre-pressing component.

As shown in fig. 1, 3 and 7, one side (lower side in fig. 1) of the diaphragm 10 has a plurality of capsules 11, and the capsules 11 define a capsule cavity 111 opened toward the other side (upper side in fig. 1) of the diaphragm 10. The diaphragm 10 is a flexible member, for example, made of a rubber material. Thus, the volume of the cavity 111 can be increased or decreased under the compression or stretching of the capsule body 11 by an external force, thereby realizing a process of pumping gas.

The capsule seat 20 is used for supporting the diaphragm 10, the capsule seat 20 is provided with a plurality of capsule openings 21 penetrating through the thickness of the capsule seat, the diaphragm 10 is flatly attached to the capsule seat 20, and the plurality of capsule bodies 11 respectively penetrate through the capsule openings 21.

Wherein the bag holder 20 is provided with an air intake passage 22. The gas inlet passage 22 is used to deliver gas to the bladder cavity 111. Of course, the intake passage 22 is not formed only on the bag holder 20. For example, the intake passage 22 may be formed in part on the capsule seat 20 and in part on the pump body, in which case the intake air flow first passes through the intake passage 22 on the capsule seat 20, then flows upward through the intake passage 22 on the pump body, then is deflected downward, and finally is sucked into the capsule 111, in which case the flow noise is reduced by lengthening the stroke of the intake air flow.

It is understood that, in order to avoid the gas in the bladder cavity 111 from flowing backwards, the flow direction of the intake passage 22 may be provided with the intake valve 40, and the intake valve 40 may conduct the bladder cavity 111 and the intake passage 22 in a single direction, specifically, in the case of inhalation due to the stretching volume of the bladder cavity 111 increasing, the intake valve 40 is opened, and the gas is delivered into the bladder cavity 111 through the intake passage 22; in the case where the bag chamber 111 is deflated with the compression volume reduced, the intake valve 40 is closed, so that the reverse flow of the air flow is avoided by disposing the intake valve 40 in the flow direction of the intake air flow.

Further, the pump body includes a valve seat 31 and a pump cover 32 which are stacked on each other, and the valve seat 31 is stacked on the diaphragm 10. The pump body is typically made of a plastic material for ease of molding.

Specifically, as shown in fig. 1 and 3, the valve seat 31 and the pump cover 32 form an air outlet cavity 33 and a spring cavity 34 which are independent of each other, the valve seat 31 has an air outlet channel 311, and the air outlet channel 311 is communicated with the bag cavity 111. That is, when the capsule cavity 111 is compressed, the gas in the capsule cavity 111 can flow into the gas outlet cavity 33 through the gas outlet channel 311, and the gas flow does not flow into the spring cavity 34.

In order to avoid the reverse flow of the air in the air outlet channel 311, an air outlet valve 51 is also arranged in the flow direction of the air outlet channel 311, and the air outlet valve 51 is used for conducting the air outlet cavity 33 and the bag cavity 111 in a one-way manner. Specifically, in the case where the bag chamber 111 is drawn in by the increase in the pull-up volume, the gas outlet valve 51 is closed, and the gas is delivered into the bag chamber 111 through the gas inlet passage 22; in the case where the volume of the bag chamber 111 is reduced by compression and the air is discharged, the air outlet valve 51 is opened and the air flow is reversed from the air outlet passage 311. It will be appreciated that one of the inlet valve 40 and the outlet valve 51 is open and the other is closed, so that the bladder cavity 111 is caused to reciprocate for either the intake or exhaust pumping process.

The valve seat 31, the diaphragm 10 and the capsule seat 20 all constitute a return passage 35, the return passage 35 communicating with the intake passage 22 and not with the spring chamber 34. A pressure relief valve 52 is provided in the outlet chamber 33 for selectively communicating the return channel 35 with the outlet chamber 33. When the micro air pump 100 pressurizes the device to be inflated beyond the preset pressure, the pressure relief valve 52 is opened, and the backflow channel 35 leads out the air flow in the air outlet cavity 33 and flows back into the air inlet channel 22 through the backflow channel 35.

Referring to fig. 1 and 3, a preload assembly is provided in the spring chamber 34, the preload assembly including a spring 71, the spring 71 applying a preload force to the relief valve 52. Because the air outlet cavity 33 and the spring cavity 34 are independent from each other, the air flow in the air outlet cavity 33 cannot flow into the spring cavity 34, and the air flow in the backflow channel 35 cannot flow into the spring cavity 34, so that the problem that the spring 71 shakes or deflects due to the pressure relief air flow or the air outlet air flow is avoided, therefore, the assembly posture of the spring 71 in the spring cavity 34 can be kept unchanged, the same abutting force can be applied to the pressure relief valve 52, the pressure relief valve 52 is guaranteed to be accurately actuated, and the pressurizing stability of the miniature air pump 100 is improved.

In short, according to the utility model discloses miniature air pump 100, spring chamber 34 blocks with going out gas chamber 33 and return flow path 35 respectively to avoid giving vent to anger the air current or return air current flow to spring chamber 34 in, make spring 71 fix a position in spring chamber 34 relatively steadily, guarantee that spring 71 can remain unchanged all the time to the butt power of relief valve 52, improve the accuracy nature that relief valve 52 moved, and then improve miniature air pump 100 and treat the pressurized stability of air charging outfit.

In addition, since the return air flow is discharged into the intake passage 32, it is not directly discharged into the external atmosphere, so that the air flow noise can be reduced, and the operation noise of the micro air pump 100 can be reduced. The groove 20211 on the hole wall of the shaft hole 2021 of the motor base 202 can also absorb the heat of the flowing air flow, reduce the temperature of the inner cavity of the pump body and prolong the service life of the micro air pump 100.

In some embodiments of the present invention, as shown in fig. 1 and 3, the air outlet valve 51 and the pressure release valve 52 are integrally formed on one valve membrane 50. Namely, a gas outlet valve 51 and a pressure release valve 52 are integrated on the valve membrane 50. The valve membrane 50 is clamped between the valve seat 31 and the pump cover 32, so that the on-off of the air outlet channel 311 can be controlled through the air outlet valve 51, and the air pressure in the air outlet cavity 33 can be regulated and controlled through the pressure release valve 52, so that the pressurization of the device to be inflated is regulated and controlled.

Specifically, the relief valve 52 is formed on the side of the valve film 50 facing the valve seat 31, a groove is provided on the valve seat 31, and a communication hole 53 communicating the groove and the gas outlet chamber 33 is provided on the valve film 50. That is, the air flow in the air outlet chamber 33 can flow from the communication hole 53 to the groove, and when the relief valve 52 is opened, the air flow flows from the groove to the return channel 35, thereby realizing the pressure relief process.

Alternatively, as shown in fig. 3, the groove includes: the annular groove 3121 and the strip groove 3122 that is radially distributed in annular groove 3121 circumference, the free end of strip groove 3122 sets up with the intercommunicating pore 53 is relative. As can be seen from fig. 2 and 3, the backflow channel 35 is located in the middle of the pump body, the air outlet cavity 33 is located on the periphery of the pump body, the air flow in the air outlet cavity 33 on the periphery is guided to the annular groove 3121 in the middle through the strip groove 3122, and when the pressure release valve 52 is opened, the air flow can be guided out through the backflow channel 35.

Alternatively, as shown in fig. 1 and 3, the relief valve 52 is an annular lip that surrounds the inlet of the return passage 35 and abuts against the valve seat 31. The spring 71 of the preassembly is abutted on the valve membrane to enable the annular convex lip to be tightly attached to the valve seat 31, and when the air pressure in the air outlet cavity 33 is not enough to abut against the pressure relief valve 52, the groove is not communicated with the return channel 35; when the air pressure in the air outlet cavity 33 is greater than the abutting force of the spring 71, the relief valve 52 moves upward as a whole, so that the annular lip is separated from the abutting surface of the valve seat 31, and the groove is communicated with the return passage 35.

In an alternative embodiment, the other side of the valve membrane 50 is provided with a positioning rod 54, and the pre-pressing assembly further includes: the spring 71 seat, the positioning rod 54 is threaded through the spring 71 seat, and one end of the spring 71 is abutted against the limiting groove 721 limited by the spring 71 seat. The spring 71 is positioned on the valve membrane by the positioning rod 54, and the spring 71 is clamped in the limiting groove 721 and applies an abutting force to the spring 71, thereby indirectly abutting the relief valve 52 on the valve seat 31. That is, the spring 71 and the valve diaphragm can be firmly connected by the engagement of the spring 71 and the positioning rod 54.

In a further alternative embodiment, the pump cover 32 forms a guide cavity 321 communicated with the spring cavity 34, the other end of the spring 71 extends into the guide cavity 321, and a stop 73 for applying a pretightening force to the other end of the spring 71 is arranged in the guide cavity 321. That is, both ends of the spring 71 are defined between the seat of the spring 71 and the stopper 73 and are defined in the guide cavity 321 in the circumferential direction, preventing the rocking or wobbling thereof, thereby improving the stability of the pre-assembly in the spring cavity 34.

In other embodiments of the present invention, as shown in fig. 1 and fig. 3, the bag holder 20 is provided with a plurality of sinking grooves 23, and the sinking grooves 23 are respectively communicated with the air inlet passage 22 and the return passage 35. In this way, the return air flow can be dispersedly sent to different air inlet channels 22 through the plurality of sunken grooves 23, the return air flow is prevented from being concentrated on the return channel 35 of the bag seat 20 and flowing out, and therefore air flow noise is reduced.

In other embodiments of the present invention, as shown in fig. 1 and fig. 3, a valve cover 80 is disposed on the pump cover 32, a buffer cavity 81 is formed between the pump cover 32 and the valve cover 80, and the buffer cavity 81 is communicated with the air outlet cavity 33. That is, the gas flowing out of the gas outlet chamber 33 is not directly sent to the apparatus to be inflated, but reaches the buffer chamber 81 in advance. Thus, the air flow can be discharged after being muffled in the buffer chamber 81, thereby reducing the operation noise of the micro air pump 100.

In order to avoid the air flow from flowing back to the air outlet cavity 33, a one-way valve 90 is arranged at the air outlet of the valve cover 80 or the pump cover 32, and the one-way valve 90 is opened only when the air outlet cavity 33 supplies air to the outside; when the air outlet cavity 33 does not supply air to the outside, the check valve 90 is in a closed state.

In other embodiments of the present invention, the intake valve 40 is integrally formed with the diaphragm 10 and is disposed opposite to the outlet of the intake passage 22. I.e. the inlet valve 40 is part of the diaphragm 10, when the capsule 111 is inhaling, the inlet air flow can be fed into the capsule 111 directly through the inlet passage 22 formed by the capsule seat 20.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly above and obliquely above the second feature, or simply meaning that the first feature is at a lesser level than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although embodiments of the present invention have been shown and described, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that changes, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the principles and spirit of the present invention.

Claims

1. A micro air pump, comprising:

the diaphragm is provided with a plurality of capsule bodies on one side, and the capsule bodies form a capsule cavity which is opened towards the other side of the diaphragm;

the bag seat is provided with a plurality of bag openings penetrating through the thickness of the bag seat, the diaphragm is attached to the bag seat, the bag bodies respectively penetrate through the bag openings, and the bag seat is provided with an air inlet channel;

the driving part, the driving part has motor cabinet and motor, the motor cabinet be equipped with the axle complex shaft hole of motor, the pore wall in shaft hole is equipped with the groove cave, the bag seat connect in on the motor cabinet, the motor cabinet the bag seat with the air outlet chamber is established to the diaphragm, the bottom of motor cabinet is equipped with the inlet channel, the air chamber with the inlet channel intercommunication.

2. The micro air pump as claimed in claim 1, wherein the groove is formed by recessing from top to bottom, the depth of the shaft hole is h1, the depth of the groove is h2, and h2 is smaller than h 1.

3. The micro air pump according to claim 2, wherein the groove hole has a plurality of groove holes surrounding a shaft of the motor.

4. The micro air pump as claimed in claim 1, wherein the inlet of the inlet flow channel is disposed in one radial direction of the motor base, the outlet of the inlet flow channel is disposed in the other radial direction of the motor base, and the outlet of the inlet flow channel is communicated with the air chamber.

5. The micro air pump as claimed in claim 4, wherein the inlet flow channel is provided with a plurality of buffer flow channels, and the buffer flow channels are distributed along two sides of the inlet flow channel.

6. The micro air pump according to claim 5, further comprising:

the pump body comprises a valve seat and a pump cover which are overlapped, the valve seat is overlapped on the diaphragm, the valve seat and the pump cover form an air outlet cavity and a spring cavity which are independent of each other, an air outlet channel is arranged on the valve seat and is communicated with the bag cavity, the valve seat, the diaphragm and the bag seat form a backflow channel which is communicated with each other, and the backflow channel is communicated with the air inlet channel and is not communicated with the spring cavity;

the air inlet valve is arranged in the flow direction of the air inlet channel and is used for conducting the bag cavity and the air inlet channel in a one-way mode;

the air outlet valve is arranged in the flowing direction of the air outlet channel and is used for conducting the air outlet cavity and the bag cavity in a one-way mode;

the pressure relief valve is arranged in the air outlet cavity and used for selectively communicating the backflow channel and the air outlet cavity;

the pre-pressing assembly is arranged in the spring cavity and comprises a spring, and the spring applies pre-pressing force to the pressure release valve.

7. The miniature air pump according to claim 6, wherein said air outlet valve and said pressure relief valve are integrally formed on a valve membrane, said pressure relief valve is formed on a side of said valve membrane facing said valve seat, said valve seat is provided with a groove, and said valve membrane is provided with a communication hole for communicating said groove with said air outlet chamber.

8. The miniature air pump according to claim 7, wherein said pressure relief valve is an annular lip surrounding said inlet of said return channel, said annular lip abutting said valve seat.

9. The micro air pump according to claim 7, wherein the groove comprises: the annular groove and be radially distribute in the circumferential bar groove of annular groove, the free end in bar groove with the intercommunicating pore sets up relatively.

10. The micro air pump according to claim 7, wherein a positioning rod is disposed on the other side of the valve membrane, and the pre-pressing assembly further comprises: the spring seat, the locating lever wears to establish the spring seat, the one end butt of spring in the spacing inslot that the spring seat was injectd.