KR20200023462A - Micro Air Injection Pump Housing Body Structure and Micro Air Injection Pump - Google Patents

Abstract

A micro air injection pump housing body structure and a micro air injection pump are provided, and the micro air injection pump includes a pump housing body 110, a cover plate 111, and a diaphragm 120 which are detachably assembled. Among them, the hollow inner cavity 117 is installed in the pump housing body 110, the air inlet 112 is installed on the top surface of the pump housing body 110, the air outlet 115 is the pump housing body ( It is installed on the side surface of the 110, the diaphragm 120 is located in the inner cavity 117 to separate the inner cavity 117 into the upper impeller chamber and the lower control chamber. The micro-injection pump housing body structure and the micro-injection pump separate the inner cavity 117 into the impeller chamber and the control chamber through the diaphragm 120 disposed in the pump housing body 110 so as to separate different internal components, respectively. Easy to assemble on the upper and lower surfaces of the diaphragm 120, the overall structure is small and light, it is convenient to carry and use.

Description

Micro Air Injection Pump Housing Body Structure and Micro Air Injection Pump

TECHNICAL FIELD The present invention relates to the field of air injection devices, and more particularly, to a type of micro air injection pump housing body structure and a micro air injection pump.

This application claims the priority of the Chinese patent application, filed with the Patent Office of the Chinese Patent Office on 07/07/2017, with the name "Micro air injection pump housing body structure and micro air injection pump", the entire contents Is incorporated herein by reference.

The air injection pump is also called an air pump, an inflator, and is an air injection mechanism that operates by driving a motor. The air injection pump may inject air into various products in the life, for example, air cushions or air pillows, which are always available when traveling; It can also be used as a cleaner to clean foreign objects in the keyboard. Many conventional air injection pumps are large in structure, inconvenient to carry, and cumbersome to use. Although there are some air-injection pumps that have a small structure at present, the inventors have found that the conventional micro-air injection pumps have a problem in that assembly is complicated and disassembly is inconvenient, although the structure is miniaturized.

An object of the present invention is to provide a micro air injection pump housing body structure to facilitate the assembly of the internal parts of the micro air injection pump through the structure of the micro air injection pump housing body.

Another object of the present invention is to provide a micro air injection pump that is easy to assemble.

Embodiments of the present invention are implemented through the following technical solutions.

Micro air injection pump housing body structure

A pump housing body in which a hollow inner cavity is installed inside, an air inlet is installed on an upper surface, an air outlet is installed on a side surface, and an opening suitable for assembling the internal parts is further installed;

A diaphragm located in the inner cavity for separating the inner cavity into an impeller chamber and a control chamber; And

And a cover plate detachably assembled to the opening.

In addition, a through hole is provided in the diaphragm.

In addition, the diaphragm enters the pump housing body through the opening and is removably fixed in the inner cavity.

In addition, the pump housing body is molded in one piece.

The micro air injection pump of the present invention is implemented as follows.

The micro air injection pump includes a micro air injection pump housing body structure,

A motor located within the control chamber and the output shaft inserted into the impeller chamber;

An impeller assembly located in the impeller chamber, the impeller assembly being connected to the output shaft of the motor and controlled to be rotated by the output shaft of the motor;

A control circuit board positioned in the control chamber to control the operation of the motor to rotate the impeller assembly;

The apparatus further includes a power supply unit electrically connected to the control circuit board.

In addition, both the motor and the control circuit board are fixedly connected to the diaphragm.

In addition, the micro-injection pump further includes an installation column connected to the diaphragm and positioned in the control chamber; The control circuit board is fixed to the installation column, and the control circuit board is located between the installation column and the motor.

In addition, a retainer plate is further disposed within the impeller chamber and surrounding the impeller assembly and connected to the top surface of the diaphragm.

Also, the top surface of the impeller assembly is lower than the top surface of the retainer plate; The top edge of the retainer plate bears against the inner cavity wall of the pump housing body.

In addition, an air discharge nozzle which is lap jointed with an air discharge port is provided at the side end surface of the retainer plate.

The control circuit board also includes a single chip microcomputer and an overcurrent protection circuit electrically connected to the single chip microcomputer.

The overcurrent protection circuit also includes a protection chip, a control pin connected to the protection chip, a switch tube, and a sensitive resistor;

The switch tube and the sensitive resistor are connected in series with the protective branch circuit of the protective chip, and both ends of the sensitive resistor are connected with the measuring pin of the protective chip; The switch tube is arranged to conduct or interrupt the protective branch circuit.

The micro-injection pump further includes a switch button electrically connected to the single chip microcomputer, the switch button being for turning the motor on or off.

In addition, the switch hole is opened in the pump housing body, the flexible dust cap is installed in the switch hole; The flexible dust cap and the switch button are arranged to trigger the switch button when pressed.

The power supply unit also includes a rechargeable battery; The rechargeable battery is electrically connected to the control circuit board.

In addition, the micro air injection pump further comprises an input voltage switching circuit electrically connected to the rechargeable battery and a USB input port electrically connected to the input voltage switching circuit; The USB input port is installed in the pump housing body.

The impeller assembly also includes a rotation axis and at least six blades evenly distributed around the rotation axis;

The blade is connected perpendicular to the axis of rotation; And

The blade includes an integrally molded rectangle and an isosceles trapezoid located above the rectangle.

Embodiments of the present invention have at least the following advantages and beneficial effects:

The micro-injection pump housing body structure and the micro-injection pump provided by the present invention separate the inner cavity of the pump housing body into an impeller chamber and a control chamber through a diaphragm disposed in the pump housing body, thereby separating different inner parts of the diaphragm. It is easy to assemble on the upper and lower surfaces, that is, the assembly of the diaphragm and the pump housing body can be completed immediately, so that the assembly of the whole micro air injection pump can be completed immediately, thus improving the convenience of assembly and disassembly and repair. Do.

BRIEF DESCRIPTION OF DRAWINGS To describe the technical solutions in the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings that should be used in the embodiments. Should not be regarded as limiting. It should be understood that, for ordinary skilled persons in the art, other related drawings may be obtained based on these drawings, provided they do not carry out creative labor.
1 is a first perspective view of a micro air injection pump housing body structure provided in Embodiment 1 of the present invention.
FIG. 2 is a second perspective view of the micro pneumatic pump housing body structure provided in Embodiment 1 of the present invention. FIG.
3 is a front view of the micro-injection pump housing body structure provided in Example 1 of the present invention.
4 is a perspective view of a diaphragm provided in Embodiment 2 of the present invention.
5 is a front view of a diaphragm provided in Example 2 of the present invention.
Fig. 6 is a front view after mounting the motor on the diaphragm provided in the second embodiment of the present invention.
7 is a structural diagram of an overcurrent protection circuit provided in a second embodiment of the present invention.
8 is a structural diagram of a micro air injection pump provided in Example 2 of the present invention.

BRIEF DESCRIPTION OF DRAWINGS To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the accompanying drawings in the embodiments of the present invention will be described in detail below in a clear and complete description of the technical solutions of the embodiments of the present invention. Apparently, the described embodiments are some but not all of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained under the premise that the ordinary skilled person in the field does not perform creative labor are all within the protection scope of the present invention.

Accordingly, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely to illustrate alternative embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained under the premise that the ordinary skilled person in the field does not perform creative labor are all within the protection scope of the present invention.

In the description of the present invention, the terms indicating azimuth or positional relationship are based on the azimuth or positional relationship shown in the accompanying drawings, and for the convenience of description and the simplification of the description, the device or element indicating or implying Note that it does not necessarily have to have a particular orientation or to be constructed and manipulated in a particular orientation, and therefore should not be understood as limiting the invention.

In the present invention, the terms "installation", "connection", "combination", "fixed" and the like should be understood broadly unless specifically defined and limited otherwise. For example, it may be fixedly connected, may be detachably connected, or may be integrally formed; It may be a mechanical connection or an electrical connection; It may be a direct connection, an indirect connection through an intermediate medium, an internal communication between two devices, or an interaction relationship between two devices. Those skilled in the art will understand the specific meaning of the terms in the present invention according to the specific circumstances.

In the description of the present invention, the azimuth or positional relationship indicated by "up", "lower", etc., is based on the azimuth or positional relationship shown in the accompanying drawings, or the azimuth or positional relationship normally placed when using the invention product, It is merely for the convenience of description and for the simplification of the description that does not necessarily mean that a device or element which indicates or implies has to have a specific orientation, or is constructed and manipulated in a specific orientation, and therefore is understood to limit the invention. It should not be. In addition, terms such as “first” and “second” are merely for distinguishing purposes and should not be understood as indicating or implying relative importance.

Example 1:

The present embodiment provides a micro air injection pump housing body structure, and as shown in FIGS. 1 and 2, the pump housing body 110 and the cover plate 111, the air inlet 112, and the air outlet 115. And diaphragm 120. Among them, the hollow inner cavity 117 is installed in the pump housing body 110, the air inlet 112 is installed on the top surface of the pump housing body 110, the air outlet 115 is the pump housing body ( Is installed on the side surface of the 110, the diaphragm 120 is installed in the inner cavity 117 to separate the inner cavity 117 into the impeller chamber and the control chamber, the air inlet 112 and the air outlet 115 is All penetrate through the impeller chamber to form an air flow passage. The pump housing body 110 is further provided with an opening suitable for assembling internal components, and a cover plate 111 detachably assembled at the opening portion is correspondingly installed. The opening may be installed in the side end surface of the pump housing body 110, or may be installed in the low end surface of the pump housing body 110, the micro air injection pump housing body structure in the present embodiment is the opening of the pump housing body ( 110 is installed on the lower end surface.

Referring to FIG. 8, the design of the pump housing body 110 may adopt a cylindrical or square cylinder design, but is not limited thereto.

The detachable assembly of the pump housing body 110 and the cover plate 111 may adopt a fitting coupling connection, but is not limited thereto, and specifically, the cover plate 111 may be formed at the bottom end edge of the pump housing body 110. A fitting coupling groove 119 suitable for inserting a fitting coupling portion (not shown) on the top is installed to implement assembly or detachment of the pump housing body 110 and the cover plate 111.

4 and 5, a positioning hole column (not shown) is installed on the wall of the inner cavity 117 of the pump housing body 110 to assemble and position the diaphragm 120. The screw 120 is fixed to the pump housing body 110 by inserting the screw into the screw hole 127 and the corresponding positioning hole column through the screw hole 127 opened at a position corresponding to the positioning hole column. Install. The diaphragm 120 may enter and exit the inner cavity 117 through an opening installed in the pump housing body 110.

4 and 5, through holes 125 are formed in the diaphragm 120 to facilitate assembling other internal parts of the micro-air injection pump to the upper and lower end faces of the diaphragm 120.

In addition, in this embodiment, the pump housing body 110 is manufactured by an integral molding process, which helps to reduce the apparent assembly traces of the micro-injection pump housing body structure, thereby further increasing the appearance of the appearance. .

The micro-pneumatic pump housing body structure provided in this embodiment separates the inner cavity 117 into the impeller chamber and the control chamber through the diaphragm 120 disposed in the pump housing body 110, so as to separate different internal components, respectively. It is easy to assemble on the upper and lower surfaces of the diaphragm 120, that is, simply implement the assembly of the diaphragm 120 and the pump housing body 110 can immediately complete the assembly of the whole micro air injection pump, Convenience is improved. The micro-injection pump housing body structure reduces the appearance of the assembly marks, the appearance is beautiful, and the overall structure is small and light, it is convenient to carry and use.

Example 2:

This embodiment provides a micro air injection pump, and with reference to FIG. 3 and FIG. 3, the micro air injection pump includes a micro air injection pump housing body structure provided in Example 1, and a motor. 150, impeller assembly, control circuit board and power supply unit. Among them, the motor 150 is located in the control chamber of the micro air injection pump housing body structure and the output shaft is inserted into the impeller chamber from the portion of the through hole 125 provided in the diaphragm 120. The impeller assembly is located in the impeller chamber and is connected to the output shaft of the motor 150 to control the rotation by the output shaft of the motor 150. The control circuit board is located in the control chamber and electrically connected to the motor 150. The control circuit board controls the operation of the motor 150, that is, the control circuit board controls the operation of the motor 150 to rotate the impeller assembly. . The power supply unit is electrically connected to the control circuit board to supply electricity to the control circuit board and the motor 150.

The control circuit board includes an overcurrent protection circuit electrically connected to the single chip microcomputer 130 and the single chip microcomputer 130. With the overcurrent protection circuit installed, when the current of main circuit exceeds the rated current, the overcurrent protection circuit automatically cuts off electricity to protect the micro air injection pump from damage.

The micro air injection pump further includes a switch button electrically connected to the single chip microcomputer 130, and pressing the switch button may control the on or off of the motor 150. Specifically, a switch hole facing the switch button 137 is opened on the wall of the inner cavity 117 of the pump housing body 110, and the switch hole is suitable for pressing and operating the switch button 137. In order to prevent foreign matter dust from entering the pump housing body 110, a flexible dust cap (not shown) is installed at the switch hole. When the flexible dust cap is pressed, the flexible dust cap is in contact with the switch button 137, thereby triggering the switch button 137 and controlling the on or off of the motor 150.

Both the motor 150 and the control circuit board are fixed to the bottom surface of the diaphragm 120. Specifically, the motor 150 and the diaphragm 120 are coupled through a screw. As shown in FIG. 6, referring to FIG. 4, in order to facilitate installation of the single chip microcomputer 130, an installation pillar 132 is installed on the bottom surface of the diaphragm 120. The installation pillar 132 is installed at a distance from the motor 150 while being perpendicular to the diaphragm 120. Installing the control circuit board between the installation pillar 132 and the motor 150 can enhance the protection of the control circuit board, and reduces the probability that the control circuit board is damaged due to external impact. In addition, the through hole 133 is disposed in the installation pillar 132 so that the switch button 137 penetrates the installation pillar 132, and the switch hole is installed corresponding to the through groove 133 on the installation pillar 132. It is easy to operate by pressing the switch button 137.

Referring to FIG. 4, a retainer plate 122 surrounding the impeller assembly and connected to the top surface of the diaphragm 120 is further disposed in the impeller chamber. An air discharge nozzle 123 which is lap jointed with the air discharge port 115 is formed at the side end surface of the retainer plate 122, and the upper edge of the retainer plate 122 is formed in the inner cavity 117 of the pump housing body 110. Held up to the wall. Combination of the retainer plate 122 and the air discharge nozzle 123 increases the cohesiveness of the wind toward the air discharge port 115 from the air discharge nozzle 123. The top surface of the impeller assembly is lower than the top surface of the retainer plate 122 to facilitate normal operation of the impeller assembly.

Optionally, as shown in FIG. 7, the overcurrent protection circuit includes a protection chip U1, a control pin connected to the protection chip U1, a switch tube U2, and a sensitive resistor RS. The switch tube U2 and the sensitive resistor RS are connected together in series to the protection branch circuit of the protection chip U1, and both ends of the sensitive resistor RS are connected to the measurement pin of the protection chip U1. The switch tube U2 is for conducting or interrupting the protective branch circuit. The protection chip U1 generates a control signal according to the measurement signal.

If the skilled person in the art, the protection chip (U1) can calculate the current through the measured voltage and compare the threshold value to generate the control signal, as well as to generate the control signal by measuring the physical signal such as temperature I understand that. In other words, the sensitive resistance RS is one or a plurality of pressure-sensitive resistors, heat-sensitive resistors, photosensitive resistors, moisture sensitive resistors, magnetoresistances and gas sensitive resistors. The pin of the protection chip U1 measures a corresponding physical signal to generate a control signal when the preset threshold is reached. In the present embodiment, an example of generating a control signal by comparing a threshold value after calculating a current through a voltage measurement using the sensitive resistor RS as a reduced pressure resistor will be described. The built-in sensitive resistor (RS) enhances the filtering effect of the overcurrent protection circuit and reduces the space consumption, while at the same time achieving the technical effect of accurate overcurrent protection threshold value, good safety and long life of power supply. .

The measuring pin of the protection chip U1 comprises a pin VM and a pin VSS, and the pin VM is connected to the resistor R2 in series and then the pin 1 of the sensitive resistor RS and the switch tube U2. Is connected to pin S2 and pin S2 ', and pin VSS is connected to pin 2 and port B- of the sensitive resistor RS. The measuring pin of the protection chip U1 includes a pin DO and a pin CO, the pin DO is connected to the pin G2 of the switch tube U2, and the pin CO is connected to the switch tube U2. Is connected to pin G1).

The overcurrent protection circuit further includes a resistor R1, a capacitor C1, a capacitor C2A, a capacitor C2B, a capacitor C3, a capacitor C4, and a resistor R3. Among them, pin 1 of resistor R1 is connected to port B +, port P + and pin 1 of capacitor C4, and pin 2 is pin 1 of capacitor C1. Is connected to pin VDD of the protection chip U1; Pin 2 of capacitor C1 is connected in series to capacitor C2A, capacitor C2B, and then pin S1 of switch tube U2, pin S1 ', pin 2 of capacitor C3, Connected to pin 2 and port P− of resistor R3; Pin 1 of capacitor C3 is connected in series to capacitor C4 and then to port B +, pin 1 of resistor R1 and port P +; Pin 1 of resistor R3 is connected to port NTC.

The switch tube U2 uses a MOSFET tube, but is not limited thereto.

The overcurrent protection circuit is integrated in a circuit board installed in the control chamber, and the power supply for supplying electricity is the power supply unit in this embodiment.

The power supply unit in this embodiment includes a rechargeable battery (not shown). The rechargeable battery is located in the control chamber and the rated voltage is set to 3.7V DC. The micro air injection pump includes an input voltage switching circuit (not shown) electrically connected to the rechargeable battery and a USB input port 139 electrically connected to the input voltage switching circuit. The USB input port 139 is installed in the pump housing body 110. The rechargeable battery is charged through the USB input port 139. The rated voltage of the USB input port 139 is 5V, and the 5V power charger is the most common mobile phone power charger, and can charge the rechargeable battery anytime and anywhere, thereby reducing the limitation of charger selection. Through the installed input voltage switching circuit, the input voltage switching circuit is mainly composed of a converter, the converter is for converting the input 5V voltage to 3.7V to output.

Specifically, in order to meet the use requirements, the rechargeable battery in this embodiment uses a polymer lithium battery, and in order to ensure the electricity supply requirement, it is preferable to install two polymer lithium batteries. In the actual assembly process, the polymer lithium battery may be directly attached to the wall of the inner cavity 117 of the pump housing body 110, or the lithium battery fixing plate may be disposed on the bottom surface of the diaphragm 120 to divide the polymer lithium battery into the diaphragm 120 It can also be fixed to).

As shown in FIG. 5, the impeller assembly includes a rotating shaft 140 and at least six blades 142 that are evenly distributed around the rotating shaft 140, and six or eight can be selectively installed, and actual micro-air injection The specific number of blades 142 may be set according to the size of the pump. The blade 142 is vertically connected to the rotating shaft 140, the vertical connection is easy to amplify the amount of air flowing through the air inlet. The blade 142 also includes an integrally formed rectangular portion and an isosceles trapezoidal portion located above the rectangular portion. The bottom of the isosceles trapezoidal portion is connected to the rectangular portion, that is, the combination of the waist structure and the rectangular portion of the isosceles trapezoidal portion further amplifies the rotational force of the wind to increase the air volume of the air outlet (115).

As shown in FIG. 3, in order to enable the micro-injection pump of the present invention to be applied to more product demands, an adapter member 160 having a plurality of different diameter adapter heads 162 is mounted at the air outlet 115. .

When using the micro-injection pump for a long time, in order to allow the heat energy emitted by the motor 150 to be immediately discharged, a slight heat dissipation groove (in the wall of the inner cavity 117 of the pump housing body 110 corresponding to the control chamber) Not shown) is installed.

The assembly process of the micro-air injection pump in the present embodiment is as follows: The motor 150 is installed on the bottom surface of the diaphragm 120, for example, by using a screw (but not limited to) the motor 150 ) Is connected and fixed to pass the output shaft of the motor 150 through the through hole 125 of the diaphragm 120. Thereafter, the rotary shaft 140 of the impeller assembly is fixedly connected to the portion fitted to the output shaft of the impeller chamber of the motor 150, so that the output shaft of the motor 150 rotates the rotary shaft 140 of the impeller assembly, and then the control circuit board It is fixed to the installation column (132). After completing the above steps, the diaphragm 120 is inserted into the inner cavity 117 of the pump housing body 110, and the diaphragm 120 installed on the wall of the inner cavity 117 of the pump housing body 110 is assembled. The diaphragm 120 is fixedly installed to the pump housing body 110 using, for example, a screw (but not limited thereto) through a positioning hole column for positioning. Then, the polymer lithium battery is fixed to the wall of the inner cavity 117 of the pump housing body 110 through an adhesive member, for example, a double-sided adhesive (but not limited thereto). Finally, when the cover plate 111 is covered on the bottom surface of the pump housing body 110, the installation of the overall micro air injection pump is completed.

The micro-injection pump provided in this embodiment separates the internal cavity 117 of the pump housing body 110 into an impeller chamber and a control chamber through a diaphragm 120 disposed in the pump housing body 110, thereby providing a different interior. It is easy to assemble the parts on the upper and lower surfaces of the diaphragm 120, that is, simply implement the assembly of the diaphragm 120 and the pump housing body 110 can immediately complete the assembly of the overall micro-air injection pump It is easy to disassemble and repair while improving the convenience of assembly.

The above descriptions are merely preferred embodiments of the present invention, but are not intended to limit the present invention, and those skilled in the art can make various changes and modifications to the present invention. Any modifications, equivalent replacements, improvements, and the like, which are implemented within the spirit and principles of the present invention, should all be included within the protection scope of the present invention.

The micro-injection pump housing body structure and the micro-injection pump provided by the present invention separate the inner cavity of the pump housing body into an impeller chamber and a control chamber through a diaphragm disposed in the pump housing body, thereby separating different inner parts of the diaphragm. It is easy to assemble on the upper and lower surfaces, that is, as soon as the assembly of the diaphragm and the pump housing body is completed, the assembly of the whole micro air injection pump can be completed immediately, thereby improving the convenience of assembly and disassembly and repair. .

110: pump housing body 111: cover plate
112: air inlet 115: air outlet
117: internal cavity 119: fitting groove
120: plate 122: retaining plate
123: air discharge nozzle 125: through hole
127: threader 130: single-chip microcomputer
132: single-chip microcomputer mounting pillar 133: through groove
137: switch button 139: USB input port
140: rotation axis 142: blade
150: motor 160: adapter member
162: adapter head U1: protection chip
U2: switch tube RS: sensitive resistor
R1: resistance R2: resistance
R3: resistor C1: capacitor
C2A: Capacitor C2B: Capacitor
C3: Capacitor C4: Capacitor

Claims (17)

In the micro air injection pump housing body structure,
A pump housing body in which a hollow inner cavity is installed inside, an air inlet is installed on an upper surface, an air outlet is installed on a side surface, and an opening suitable for assembling the internal parts is further installed;
A diaphragm located in said inner cavity for separating said inner cavity into an impeller chamber and a control chamber; And
And a cover plate detachably assembled to said opening. The method of claim 1,
Micro air injection pump housing body structure characterized in that the through-hole is installed in the diaphragm. The method of claim 1,
And the diaphragm enters the pump housing body through the opening and is detachably fixed in the inner cavity. The method of claim 1,
The pump housing body is a micro air injection pump housing body structure, characterized in that molded in one piece. In the micro air injection pump,
A micro air injection pump housing body structure according to any one of claims 1 to 4,
A motor located in the control chamber and having an output shaft inserted into the impeller chamber;
An impeller assembly located in the impeller chamber, the impeller assembly being connected to an output shaft of the motor and controlled to be rotated by the output shaft of the motor;
A control circuit board positioned in the control chamber to control the operation of the motor to rotate the impeller assembly;
And a power supply unit electrically connected to the control circuit board. The method of claim 5,
And the motor and the control circuit board are both fixedly connected to the diaphragm. The method of claim 6,
The micro air injection pump further comprises an installation column connected to the diaphragm and positioned in the control chamber; And the control circuit board is fixed to the mounting pillar, and the control circuit board is positioned between the mounting pillar and the motor. The method of claim 5,
And a retainer plate surrounding the impeller assembly and connected to the top surface of the diaphragm in the impeller chamber. The method of claim 8,
The top surface of the impeller assembly is lower than the top surface of the retainer plate; And an edge of an upper surface of the retainer plate is supported by an inner cavity wall of the pump housing body. The method of claim 8,
A micro air injection pump, characterized in that the air discharge nozzle which is lap joint with the air discharge port is opened on the side end surface of the retainer plate. The method of claim 5,
The control circuit board includes a single chip microcomputer and an overcurrent protection circuit electrically connected to the single chip microcomputer. The method of claim 11,
The overcurrent protection circuit includes a protection chip, a control pin connected to the protection chip, a switch tube, and a sensitive resistor;
The switch tube and the sensitive resistor are connected in series to a protective branch circuit of the protection chip, and both ends of the sensitive resistor are connected to the measurement pin of the protection chip; And said switch tube is arranged to conduct or interrupt said protective branch circuit. The method of claim 11 or 12,
The micro air injection pump further comprises a switch button electrically connected to the single chip microcomputer, wherein the switch button is for turning on or off the motor. The method of claim 13,
A switch hole is opened in the pump housing body, and a flexible dustproof stopper is installed at the switch hole; And the flexible dustproof stopper and the switch button are arranged to trigger the switch button when the flexible dustproof stopper is pressurized. The method of claim 5,
The power supply unit comprises a rechargeable battery; The rechargeable battery is a micro air injection pump, characterized in that connected to the control circuit board. The method of claim 15,
The micro air injection pump further comprises an input voltage switching circuit electrically connected to the rechargeable battery and a USB input port electrically connected to the input voltage switching circuit; The USB input port is a micro air injection pump, characterized in that installed in the pump housing body. The method of claim 5,
The impeller assembly comprises a rotating shaft and at least six blades evenly distributed around the rotating shaft;
The blade is connected perpendicular to the axis of rotation; And
The blade is a micro-injection pump, characterized in that it comprises a rectangular portion formed integrally and an isosceles trapezoidal portion located above the rectangular portion.

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