Micro pump with positive and negative rotation for controlling inflation and exhaust

Abstract

The utility model discloses a micro pump with positive and negative rotation for controlling inflation and exhaust. Comprising a lower shell, a middle shell, an upper shell, a tower-shaped piston piece arranged between the middle shell and the upper shell, a piston frame arranged at the bottom of the tower-shaped piston piece, a motor arranged at the bottom of the lower shell, a driving block arranged on a main shaft of the motor and used for driving the piston frame to swing, and a steel needle arranged between the driving block and the piston frame. A crescent air inlet valve plate with an upward opening and a crescent air outlet valve plate with a downward opening are arranged on the tower-shaped piston plate; an air outlet nozzle penetrating through the tower-shaped piston piece and the middle shell to be communicated with the lower shell is arranged in the center of the upper shell, and a sealing gasket which can abut against the lower end of the middle shell to block the end of the air outlet nozzle and is used for reverse exhaust is arranged between the piston frame and the middle shell; the driving block is provided with a spiral track used for being in butt joint with a steel needle.

Description

Technical fields:

[0001] This utility model relates to the field of micropump technology, specifically to a micropump with forward and reverse rotation control for inflation and deflation. Background technology:

[0002] In many applications, especially in portable devices or space-constrained environments such as micro-analytical instruments, portable medical devices, and spacecraft, miniaturization and integration are critical. Traditional separate pump and valve designs can consume excessive space, resulting in an overly large or difficult-to-integrate overall system. Multiple joints and seals in separate pump and valve systems increase the likelihood of leaks; furthermore, more components mean higher maintenance costs and more complex troubleshooting processes. Independent control and operation of pumps and valves in traditional systems can lead to unnecessary energy waste. Additionally, the procurement, assembly, and commissioning of multiple components increase the overall system cost.

[0003] A flat micro air pump with a pressure relief valve, disclosed in Chinese Patent Publication No. CN 205064268 U, includes a motor 1, an eccentric cap 11, a fixed base 2, a bell cup base 3, an umbrella pin base 4, a top cover 5, umbrella pins 6, a bell cup 7, a connecting rod frame 8, and a steel needle 9. The motor 1 drives the connecting rod frame 8 to reciprocate through the eccentric cap 11 and the steel needle 9. The connecting rod frame 8 then drives the bell cup 7 to perform a cyclical expanding and contracting motion. The two umbrella pins 6 alternately open their pin holes, thus pumping gas from the inlet 16 to the outlet 15. However, the patented design uses the umbrella pins 6 as a one-way valve, making the entire pump's airflow unidirectional and preventing reverse exhaust. This necessitates additional air passages and valves for reverse exhaust, increasing the number of components, size, and cost.

[0004] In view of the above, the inventors propose the following technical solution. Utility model content:

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a micro pump with forward and reverse control for inflation and deflation.

[0006] To solve the above-mentioned technical problems, this utility model adopts the following technical solution: a micro pump with forward and reverse rotation control for inflation and deflation, comprising: a lower housing, a middle housing, an upper housing, a tower-shaped piston plate disposed between the middle housing and the upper housing, a piston frame disposed at the bottom of the tower-shaped piston plate for driving its operation, a motor disposed at the bottom of the lower housing, a drive block disposed on the motor main shaft for driving the piston frame to swing, and a steel needle disposed between the drive block and the piston frame. The tower-shaped piston plate is provided with multiple upward-opening crescent-shaped intake valve plates, and... The valve plate has a crescent-shaped air outlet with a downward opening; the center of the upper housing has an air outlet that passes through the tower-shaped piston plate and the middle housing and connects to the lower housing; a sealing gasket is provided between the piston frame and the middle housing to press against the lower end of the middle housing to block the end of the air outlet and to facilitate reverse exhaust; the drive block is provided with a spiral track for engaging with the steel needle. When the drive block rotates forward with the motor, it will lift the steel needle and push the piston frame upward to press the sealing gasket to block the air outlet. When the drive block rotates in reverse with the motor, the steel needle will lose its upward thrust, causing the piston frame to lose its pressure on the sealing gasket and open the air outlet.

[0007] Furthermore, in the above technical solution, a metal support for contacting and pressing against the piston frame is fitted onto the sealing gasket.

[0008] Furthermore, in the above technical solution, the sealing gasket has a three-claw structure design, which includes a central pressing part for pressing against the center of the middle housing to block the air outlet, and a first elastic arm, a second elastic arm, and a third elastic arm that are circumferentially arranged on the outer wall of the central pressing part and extend outward, wherein a metal support is tightly installed on the central pressing part.

[0009] Furthermore, in the above technical solution, the tower-shaped piston plate is provided with at least three air bladder chambers for alternating compression, and the piston frame is provided with at least three piston rods that are respectively interference-fitted into the first mounting holes at the bottom of the air bladder chambers. Among them, at least three crescent-shaped intake valve plates are provided and located at the bottom of the air bladder chambers, and the center of the piston rod is provided with a first intake hole that communicates with the inner cavity of the lower housing and presses against the crescent-shaped intake valve plate.

[0010] Furthermore, in the above technical solution, an exhaust collection groove is provided between the bottom of the tower-shaped piston plate and the middle shell, and at least three crescent-shaped exhaust valve plates with downward openings and connected to the exhaust collection groove are provided on the tower-shaped piston plate. At least three exhaust structures are provided at the bottom of the upper shell for connecting the air bladder cavity and the crescent-shaped exhaust valve plates respectively.

[0011] Furthermore, in the above technical solution, the air collection groove is located between the three airbag cavities, and the center of the air collection groove is provided with a first exhaust hole for outward exhaust; the exhaust structure includes a first convex ring formed on the bottom of the upper shell and capable of interference fit into the airbag cavity, a first protruding block formed on the bottom of the upper shell and pressing against the crescent-shaped air outlet valve plate, and a first strip-shaped groove formed on the bottom of the upper shell and extending into the first convex ring and the first protruding block.

[0012] Furthermore, in the above technical solution, the middle part of the housing is provided with a reverse exhaust port that connects to the exhaust collection groove, and the sealing gasket is located below the reverse exhaust port and can be used for pressure sealing.

[0013] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art: In the present invention, the air outlet of the upper shell passes through the tower-shaped piston plate and the air outlet of the middle shell, so that the air outlet can directly communicate with the inner cavity of the lower shell. A sealing gasket that can elastically press and block the communication between the air outlet and the lower shell is provided below the middle shell. The piston frame presses against the sealing gasket. The different forces exerted on the steel needle by the spiral track on the drive block when rotating forward and reverse cause the piston frame to be pushed up to block the air outlet when the motor rotates forward, and release the pushing force on the sealing gasket to open the air outlet when the motor rotates in reverse. Thus, it is possible to charge when the motor rotates forward and exhaust in reverse when the motor rotates in reverse, thereby eliminating the need for additional exhaust channels and valves, greatly reducing the number of overall parts, and achieving the purpose of reducing volume and cost. Attached image description:

[0014] Figure 1 This is a perspective view of the present invention;

[0015] Figure 2 This is a breakdown of the utility model. Figure 1 ;

[0016] Figure 3 This is a breakdown of the utility model. Figure 2 ;

[0017] Figure 4 This is a cross-sectional view of the present invention;

[0018] Figure 5 This is a schematic diagram of the tower-shaped piston plate in this utility model;

[0019] Figure 6 This is a schematic diagram of the sealing gasket structure in this utility model;

[0020] Figure 7 This is a schematic diagram of the structure of the shell in this utility model;

[0021] Figure 8 This is a schematic diagram of the drive block in this utility model. Detailed implementation method:

[0022] The present invention will be further described below with reference to specific embodiments and accompanying drawings.

[0023] See Figures 1 to 8 As shown, a micro pump with forward and reverse control for inflation and deflation includes a lower housing 1, a middle housing 2, an upper housing 3, a tower-shaped piston plate 4 disposed between the middle housing 2 and the upper housing 3, a piston frame 5 disposed at the bottom of the tower-shaped piston plate 4 for driving its operation, a motor 6 disposed at the bottom of the lower housing 1, a drive block 7 disposed on the main shaft of the motor 6 for driving the piston frame 5 to swing, and a steel needle 8 disposed between the drive block 7 and the piston frame 5. The tower-shaped piston plate 4 is provided with multiple upward-opening crescent-shaped air intake valve plates 43 and downward-opening crescent-shaped air outlet valve plates 45; the upper housing 3... The center of the piston has an outlet 32 ​​that passes through the tower-shaped piston plate 4 and the middle housing 2 and connects to the lower housing 1. A sealing gasket 81 is provided between the piston frame 5 and the middle housing 2, which can press against the lower end of the middle housing 2 to block the end of the outlet 32 ​​and is used for reverse exhaust. The drive block 7 is provided with a spiral track 71 for docking with the steel needle 8. When the drive block 7 rotates forward with the motor 6, it will lift the steel needle 8 and push the piston frame 5 upward to press the sealing gasket 81 to block the outlet 32. When the drive block 7 rotates in reverse with the motor 6, the steel needle 8 will lose its upward thrust, and the piston frame 5 will lose its pressing force on the sealing gasket 81 and open the outlet 32. The air outlet 32 ​​of the upper housing 3 passes through the tower-shaped piston plate 4 and the air outlet 32 ​​of the middle housing 2, allowing the air outlet 32 ​​to directly communicate with the inner cavity of the lower housing 1. A sealing gasket 81 is provided below the middle housing 2 to elastically press and block the communication between the air outlet 32 ​​and the lower housing 1. The piston frame 5 presses against the sealing gasket 81. The spiral track 71 on the drive block 7 exerts different forces on the steel needle 8 when rotating forward and backward. When the motor 6 rotates forward, the piston frame 5 is forced to lift the sealing gasket 81 to block the air outlet 32. When the motor 6 rotates backward, the force on the sealing gasket 81 is released, opening the air outlet 32. This allows for inflation when the motor 6 rotates forward and reverse exhaust when the motor 6 rotates backward, eliminating the need for additional exhaust channels and valves, significantly reducing the number of overall parts, and achieving the goal of reducing size and cost.

[0024] The tower-shaped piston plate 4 is provided with multiple upward-opening crescent-shaped air intake valve plates 43 and downward-opening crescent-shaped air outlet valve plates 45; the bottom of the lower housing 1 is provided with a first air intake groove 11 connecting the outside and the inner cavity. By using upward-opening crescent-shaped air intake valve plates 43 and downward-opening crescent-shaped air outlet valve plates 45 on the tower-shaped piston plate 4, the traditional umbrella-shaped parts can be replaced. Since the crescent-shaped air intake valve plates 43 and crescent-shaped air outlet valve plates 45 are integrally formed parts of the tower-shaped piston plate 4, the airtightness of long-term use can be guaranteed, thereby improving the service life of the air pump.

[0025] A metal support 82 for contacting and pressing against the piston holder 5 is fitted onto the sealing gasket 81. The sealing gasket 81 has a three-claw structure design, including a central pressing part 811 for pressing against the center of the middle housing 2 to block the air outlet 32, and a first elastic arm 812, a second elastic arm 813, and a third elastic arm 814 that are circumferentially arranged on the outer wall of the central pressing part 811 and extend outward. The metal support 82 is tightly installed on the central pressing part 811. The metal support 82 is made of stainless steel by stamping and bending, and is tightly fitted with the sealing gasket 81. The circular three-claw design of the sealing gasket 81 is beneficial for assembly and for long service life of compression and rebound. The bottom of the middle housing 2 is also provided with a positioning groove for positioning the sealing gasket 81. The ends of the first elastic arm 812, the second elastic arm 813, and the third elastic arm 814 are all set as columns, and the periphery of the positioning groove is provided with three cylindrical slots 23 for locking with the columns.

[0026] The tower-shaped piston plate 4 is provided with at least three air bladder chambers 41 for alternating compression. The piston frame 5 is provided with at least three piston pins 51 that are respectively interference-fitted into the first mounting holes 42 at the bottom of the air bladder chambers 41. At least three crescent-shaped intake valve plates 43 are provided and located at the bottom of the air bladder chambers 41. The center of the piston pin 51 is provided with a first intake hole 52 that communicates with the inner cavity of the lower housing 1 and presses against the crescent-shaped intake valve plate 43.

[0027] An exhaust collection groove 44 is provided between the bottom of the tower-shaped piston plate 4 and the middle housing 2, and at least three crescent-shaped exhaust valve plates 45 with downward openings and connected to the exhaust collection groove 44 are provided on the tower-shaped piston plate 4. At least three exhaust structures 31 are provided at the bottom of the upper housing 3 for connecting the air bladder cavity 41 and the crescent-shaped exhaust valve plates 45 respectively.

[0028] The gas collection groove 44 is located between the three air chambers 41, and a first exhaust port 46 for outward exhaust is provided at the center of the gas collection groove 44. The exhaust structure 31 includes a first convex ring 311 formed on the bottom of the upper shell 3 and capable of interference fit into the air chamber 41, a first protrusion 312 formed on the bottom of the upper shell 3 and pressing against the crescent-shaped exhaust port valve plate 45, and a first strip-shaped slot 313 formed on the bottom of the upper shell 3 and extending into the first convex ring 311 and the first protrusion 312. The piston frame 5 alternately performs piston compression action on the three air chambers 41 of the tower-shaped piston plate 4, thereby continuously pumping the gas in the lower shell 1 into the air chambers 41, and then discharging it from the first exhaust port 46 through the gas collection groove 44. The unidirectional flow of air is achieved by the unidirectional action of the crescent-shaped intake valve plate 43 and the crescent-shaped exhaust port valve plate 45, thus completing the pressurized pumping of the gas.

[0029] The middle housing 2 has a reverse exhaust port 21 that connects to the exhaust collection groove 44. The sealing gasket 81 is located below the reverse exhaust port 21 and can be used for pressure sealing. The piston frame 5 has a centering protrusion 53 that presses against the metal support 82 at the top center. The piston frame 5 has a first sleeve portion 54 that is sleeved on the steel needle 8 at the bottom center. The inclined hole 71 is eccentrically located on one side of the drive block 7.

[0030] The drive block 7 is provided with an inclined hole 71 for engaging and locking with the steel needle 8. At the bottom of the inclined hole 71 is a hemisphere 72 for contacting the steel needle 8. By using a hemisphere 72 at the bottom of the inclined hole 71 of the drive block 7 to contact and press against the steel needle 8, and by using the hemisphere 72 instead of a traditional steel ball to reduce friction, noise can be reduced, costs are lower, wear can be reduced, and service life can be extended.

[0031] The lower end of the upper housing 3 is provided with at least three downwardly extending elastic buckle arms 33 for matching and fastening with the lower housing 1. The outer wall of the lower housing 1 is provided with at least three locking blocks 12 for matching and fastening with the elastic buckle arms 33. The outer wall of the middle housing 2 is provided with at least three first positioning grooves 22 for the elastic buckle arms 33 to pass through for positioning.

[0032] The first positioning groove 22 protrudes upward from the upper end face of the middle shell 2, and at least three second positioning grooves 47 corresponding to the first positioning groove 22 are provided on the outer wall of the tower-shaped piston plate 4.

[0033] The inner side of the elastic buckle arm 33 is provided with a reinforcing rib 331. The first positioning groove 22 is provided with a first positioning groove 221 corresponding to the reinforcing rib 331. The middle part of the positioning block 12 is provided with a first slot 121 for the reinforcing rib 331 to pass through. The outer wall of the lower housing 1 is provided with a third positioning groove 13 for accommodating the positioning block 12 and for the elastic buckle arm 33 to be inserted into the positioning position. The third positioning groove 13 is provided with a first stop bar 14 for limiting the elastic buckle arm 33.

[0034] The motor 6 is fixed to the bottom of the lower housing 1 by screws 9. The inner wall of the lower housing 1 is provided with a first positioning post 15 that protrudes from the upper end face and is inserted into the middle housing 2 for positioning. The middle housing 2 is provided with a first positioning post 23 for the first positioning post to be inserted for positioning.

[0035] In summary, the integrated design of this utility model can significantly reduce the overall size of the equipment, making the system more compact. Reducing the number of joints and seals can greatly reduce the risk of fluid leakage, improve the safety and reliability of the system, and fewer components mean lower maintenance requirements and costs. At the same time, a simpler system design can reduce energy consumption and initial investment costs. The integrated pump and valve system can more accurately control the delivery of fluid, improving the performance and efficiency of the entire system.

[0036] This utility model provides a micro pump valve integrated for controlling the inflation and deflation of an electric motor by forward and reverse rotation. It includes a tower-shaped piston plate 4 and an upper housing 3 pressed onto the tower-shaped piston plate 4. The tower-shaped piston plate 4 includes a crescent-shaped outlet valve plate 45 with a downward opening and a crescent-shaped inlet valve plate 43 with an upward opening. It forms a double-layer air passage design with the upper housing 3 and the middle housing 2. The upper surface of the upper housing 3 is recessed to form an air passage for the outlet. The piston frame 5 has a cylindrical air passage that fits tightly with the tower-shaped piston plate 4. An air inlet hole is opened on the air passage to cooperate with the crescent-shaped air passage of the air inlet of the tower-shaped piston plate 4. When the motor 6 drives the drive block 7 to rotate forward, the steel needle 8 is at the highest point of the spiral track 71, which drives the piston frame 5 to rise and press against the metal bearing 82. This causes the sealing gasket 81 to seal the reverse exhaust port 21 of the middle housing 2. The air bladder 41 of the tower-shaped piston plate 4 is stretched, thus increasing its volume. The crescent-shaped air inlet valve plate 43 opens, and the outside gas enters the cavity through the first air inlet groove 11 of the lower housing 1, and then enters the air bladder 41 of the tower-shaped piston plate 4 through the air inlet hole of the piston frame 5. When the air bladder 41 is compressed, thus reducing its volume, the crescent-shaped air inlet valve plate 43 and the crescent-shaped air outlet valve plate 45 open. The gas in the air bladder 41 passes through the air outlet of the upper housing 3, pushes open the crescent-shaped air outlet valve plate 45 in the upper air channel, enters the lower air channel, and then enters the air outlet 32 ​​of the upper housing 3 for discharge. When the motor 6 drives the drive block 7 to reverse, the steel needle 8 is at the lowest point of the spiral track 71, which drives the piston frame 5 to descend and leave the metal support 82, thereby driving the sealing gasket 81 to cancel the seal of the reverse exhaust port 21 of the central housing 2. The reverse exhaust port 21 is opened, and all the gas that has passed through the upper housing 3 returns and is discharged from here.

[0037] Compared with existing technologies, the integrated miniature pump and valve of this invention reduces space requirements, lowers leakage risk, simplifies maintenance and saves costs, and enhances control precision, providing a more efficient, reliable and economical solution for modern industry and scientific research.

[0038] The specific working process of air extraction is as follows: When the positive and negative terminals of motor 6 are energized, motor 6 drives drive block 7 to rotate. The piston frame 5, equipped with steel needle 8, rotates and eccentrically swings with drive block 7, thereby driving each fulcrum of piston frame 5 to perform piston movement. The whole is divided into three air chambers. Air chamber one consists of motor 6, lower shell 1, middle shell 2, and tower-shaped piston plate 4. Air passages are set on lower shell 1 to form negative pressure. Air chamber two has three parts. Every time motor 6 rotates once, the gas in each of the three parts of air chamber two is compressed once. The compressed gas passes through the annular air passage of upper shell 33 forward, and then passes through the stepped air passage to enter air chamber three. The two-section annular air passage and stepped air passage of the upper shell 3 form a one-way valve effect, allowing gas to be compressed from the second air chamber into the third air chamber in one direction without backflow. When the gas in the second air chamber is compressed into the third air chamber, the pressure in the second air chamber is less than that in the first air chamber. At this time, the tongue-shaped air passage of the second air chamber is opened by the pressure of the first air chamber, and the gas in the first air chamber re-enters the second air chamber. This process is repeated to draw the air from the first air chamber to the outlet 32 ​​of the upper shell 3.

[0039] The following example illustrates the process of stretching and compressing a gas chamber 41 by a piston holder 5: When the gas chamber 41 of the tower-shaped piston plate 4 is stretched, increasing its volume, the crescent-shaped outlet valve plate 45 presses against the first protrusion 312, preventing gas from entering the outlet collection groove 44 from the first slot 313. Instead, gas flows in from the first inlet hole 52 on the piston holder 5, opening the crescent-shaped inlet valve plate 43 at the bottom of the gas chamber 41. At this time, external gas enters the lower housing 1 through the first inlet nozzle 11, and then enters the gas chamber 41 of the tower-shaped piston plate 4 through the first inlet hole 52 of the piston holder 5. When the gas chamber 41 is compressed, decreasing its volume... When the crescent-shaped air inlet valve plate 43 closes the valve by sticking to the first air inlet hole 52 on the piston frame 5, the airflow in the air bladder cavity 41 is squeezed into the first groove hole 313 of the upper housing 3, which pushes up the crescent-shaped air outlet valve plate 45 and opens it. At this time, the gas in the air bladder cavity 41 enters the air outlet collection groove 44 after pushing open the crescent-shaped air outlet valve plate 45 of the upper air passage, and then enters the air outlet 32 ​​of the upper housing 3 for discharge. In this way, the piston frame 5 repeatedly pushes the three air bladder cavities 41 on the tower-shaped piston plate 4 to stretch and compress alternately, and continuously draws the gas in the upper housing 1 into the air outlet 32 ​​of the upper housing 3 for discharge, thus realizing the function of the air pump.

[0040] By adopting the above solution, compared with the prior art, this utility model has the following effects:

[0041] 1. The fasteners of the upper housing 3 are made of PC material with a snap-fit ​​design, eliminating the use of screw fasteners in the existing technology;

[0042] 2. The rubber tower-shaped piston 4 adopts a stacked upper and lower air layer design, eliminating the use of umbrella-shaped components and ultrasonic riveting process in the existing technology;

[0043] 3. The piston holder 5 and the tower-shaped piston 4 adopt a tight-fitting design, eliminating the design of using Latin assembly and then cutting off the pull handle in the existing technology;

[0044] 4. The inclined hole in the drive block 7 is designed with a spiral track 71 to drive the component to rise and fall when rotating in both directions to achieve the functions of inflation and deflation.

[0045] 5. The metal bearing 82 and sealing gasket 81 are specially designed to achieve easy assembly, low cost, simple structure, low resistance, and easy springback.

[0046] Of course, the above description is only a specific embodiment of the present utility model and is not intended to limit the scope of the present utility model. All equivalent changes or modifications made to the structure, features and principles described in the claims of the present utility model should be included in the scope of the claims of the present utility model.

Claims

1. A micro pump with forward and reverse control for inflation and deflation, comprising a lower housing (1), a middle housing (2), an upper housing (3), a tower-shaped piston plate (4) disposed between the middle housing (2) and the upper housing (3), a piston frame (5) disposed at the bottom of the tower-shaped piston plate (4) for driving its operation, a motor (6) disposed at the bottom of the lower housing (1), a drive block (7) disposed on the main shaft of the motor (6) for driving the piston frame (5) to swing, and a steel needle (8) disposed between the drive block (7) and the piston frame (5), characterized in that: The tower-shaped piston plate (4) is provided with multiple crescent-shaped intake valve plates (43) with upward opening and crescent-shaped exhaust valve plates (45) with downward opening. The upper housing (3) is provided with an air outlet (32) that passes through the tower-shaped piston plate (4) and the middle housing (2) and connects to the lower housing (1). A sealing gasket (81) is provided between the piston frame (5) and the middle housing (2) to press against the lower end of the middle housing (2) to block the end of the air outlet (32) and to exhaust air in reverse. The drive block (7) is provided with a spiral track (71) for docking with the steel needle (8). When the drive block (7) rotates forward with the motor (6), it will lift the steel needle (8) and push the piston frame (5) upward to press the sealing gasket (81) to block the air outlet (32). When the drive block (7) rotates in reverse with the motor (6), the steel needle (8) will lose its upward thrust, causing the piston frame (5) to lose its pressing force on the sealing gasket (81) and open the air outlet (32).

2. A micro pump with forward and reverse rotation control for inflation and deflation as described in claim 1, characterized in that: A metal support (82) for contacting and pressing against the piston frame (5) is fitted onto the sealing gasket (81).

3. A micro pump with forward and reverse rotation control for inflation and deflation according to claim 2, characterized in that: The sealing gasket (81) has a three-claw structure design, including a central pressing part (811) for pressing against the center of the middle housing (2) to block the air outlet (32), and a first elastic arm (812), a second elastic arm (813), and a third elastic arm (814) that are circumferentially arranged on the outer wall of the central pressing part (811) and extend outward. The metal support (82) is tightly installed on the central pressing part (811).

4. A micro pump with forward and reverse rotation control for inflation and deflation according to any one of claims 1-3, characterized in that: The tower-shaped piston plate (4) is provided with at least three air bladder chambers (41) for alternating compression. The piston frame (5) is provided with at least three piston columns (51) that are respectively inserted into the first mounting hole (42) at the bottom of the air bladder chamber (41) by interference fit. Among them, at least three crescent-shaped air intake valve plates (43) are provided and located at the bottom of the air bladder chamber (41). The center of the piston column (51) is provided with a first air intake hole (52) that communicates with the inner cavity of the lower housing (1) and presses against the crescent-shaped air intake valve plate (43).

5. A micro pump with forward and reverse rotation control for inflation and deflation according to claim 4, characterized in that: An exhaust collection groove (44) is provided between the bottom of the tower-shaped piston plate (4) and the middle shell (2), and at least three crescent-shaped exhaust valve plates (45) with downward openings and connected to the exhaust collection groove (44) are provided on the tower-shaped piston plate (4). At least three exhaust structures (31) are provided at the bottom of the upper shell (3) for connecting the airbag cavity (41) and the crescent-shaped exhaust valve plates (45).

6. A micro pump with forward and reverse rotation control for inflation and deflation according to claim 5, characterized in that: The air collection groove (44) is located between the three airbag cavities (41), and the center of the air collection groove (44) is provided with a first exhaust hole (46) for exhausting air outward; the exhaust structure (31) includes a first convex ring (311) formed on the bottom of the upper shell (3) and capable of interference fit into the airbag cavity (41), a first protrusion (312) formed on the bottom of the upper shell (3) and pressing against the crescent-shaped air outlet valve plate (45), and a first strip-shaped slot (313) formed on the bottom of the upper shell (3) and extending into the first convex ring (311) and the first protrusion (312).

7. A micro pump with forward and reverse rotation control for inflation and deflation as described in claim 6, characterized in that: The middle shell (2) is provided with a reverse exhaust port (21) that connects to the exhaust collection groove (44) in the middle part, and the sealing gasket (81) is located below the reverse exhaust port (21) and can be used for pressure sealing.

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