A micro pump with automatic resilient rebound control exhaust

Abstract

The utility model discloses a kind of miniature pumps with elastic body automatic rebound control exhaust, comprising: lower shell 1, middle shell 2, upper shell 3, be set between middle shell 2 and upper shell 3 tower type piston sheet 4, be set in tower type piston sheet 4 bottom and be used to push its work piston frame 5, motor 6 being set in lower shell 1 bottom, drive block 7 being set on motor 6 main shaft and being located in lower shell 1, and steel needle 8 being set between drive block 7 and piston frame 5, upper shell 3 is provided with inflation mouth 31 and exhaust nozzle 32, and inflation mouth 31 and exhaust nozzle 32 are provided with exhaust passage 34 intercommunication, wherein, inflation mouth 31 is used for air pump to supply gas outward, exhaust nozzle 32 is used for reverse exhaust, when miniature pump works, gas flows out from inflation mouth 31 and supplies gas, when miniature pump stops working, gas enters from inflation mouth 31 after exhaust passage 34, and thus exhaust nozzle 32 reversely discharges.

Description

Technical fields:

[0001] This utility model relates to the field of micropump technology, and specifically to a micropump with an elastomer that automatically rebounds to control exhaust. 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 an elastomer automatic rebound control for exhaust.

[0006] To solve the above-mentioned technical problems, this utility model adopts the following technical solution: a micro pump with an elastic body automatic rebound control for exhaust, 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 and located inside the lower housing, and a steel needle disposed between the drive block and the piston frame; the upper housing is provided with an inflation nozzle and an exhaust nozzle, and an exhaust passage is provided between the inflation nozzle and the exhaust nozzle; the tower-shaped piston plate is provided with at least one air bladder cavity and an upwardly opening first crescent-shaped valve plate; the middle housing includes an upper middle housing and a lower middle housing located on both sides of the tower-shaped piston plate. The body comprises: a lower middle shell having at least one air inlet for connecting the lower shell and the tower-shaped piston plate cavity; a lower guide air passage connecting the first crescent-shaped valve plate and the air bladder cavity at the bottom of the upper middle shell; an upper guide air passage connecting the air bladder cavity and the exhaust passage at the top of the upper middle shell; and a first vent hole connecting the bottom and the top of the upper middle shell. An elastic valve body for controlling the gas flow direction is provided between the upper shell and the upper middle shell. The elastic valve body includes an arc-shaped switch valve located below the exhaust nozzle and capable of blocking the exhaust nozzle by air pressure; a second crescent-shaped valve plate located between the inflation nozzle and the upper guide air passage and opening upward; and a third crescent-shaped valve plate located between the upper guide air passage and the air bladder cavity and opening upward.

[0007] Furthermore, in the above technical solution, the elastic valve body is provided with a second valve chamber in the middle for connecting the inflation nozzle and the end of the upper guide air passage, and the second crescent-shaped valve plate is attached to and sealed at the end of the upper guide air passage in the default state; a third valve chamber is provided on the side of the second valve chamber for connecting the first vent hole and the beginning of the upper guide air passage, and the third crescent-shaped valve plate is attached to and sealed on the first vent hole in the default state; the elastic valve body is also provided with a fourth valve chamber located below the arc-shaped switch valve and connected to the middle of the upper guide air passage, and after gas is introduced into the fourth valve chamber, it can push up the arc-shaped switch valve to seal the exhaust nozzle.

[0008] Furthermore, in the above technical solution, the tower-shaped piston plate is also provided with at least a first valve cavity corresponding to the first crescent-shaped valve plate, and the upper end face of the tower-shaped piston plate is provided with a number of sealing ribs located around the air bladder cavity and the first valve cavity. The sealing ribs are located around the lower guide air passage so that the lower guide air passage can connect the air bladder cavity and the first valve cavity.

[0009] Furthermore, in the above technical solution, the upper middle shell is provided with a plurality of first positioning posts for positioning the elastic valve body, the lower middle shell is provided with a plurality of second positioning posts for positioning the tower-shaped piston plate, and the air bladder cavity penetrates the lower middle shell and is connected to the piston frame.

[0010] Furthermore, in the above technical solution, two air bladder chambers are arranged side by side on the tower-shaped piston plate, the piston frame is "T" shaped, its lower part is connected to the steel needle, and its upper two ends are respectively connected to the bottom of the two air bladder chambers of the tower-shaped piston plate.

[0011] Furthermore, in the above technical solution, the driving block is provided with an inclined hole for engaging with the steel needle, and the bottom of the inclined hole is provided with a hemisphere for contacting the steel needle.

[0012] Furthermore, in the above technical solution, the bottom of the lower housing is provided with a first air inlet groove that connects the outside and the inner cavity, the lower end of the upper housing is provided with at least two downwardly extending elastic latching arms for matching and fastening with the lower housing, the outer wall of the lower housing is provided with at least two locking blocks for matching and fastening with the elastic latching arms, and the outer wall of the middle housing is provided with at least two first positioning grooves for the elastic latching arms to pass through for positioning.

[0013] Furthermore, in the above technical solution, at least two second positioning grooves are provided on the outer wall of the tower-shaped piston plate for the elastic buckle arm to pass through and be positioned.

[0014] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art: The present invention uses a special air passage composed of an air inlet, a lower guide air passage, a first vent, and an upper guide air passage on the middle shell, and adds an elastic valve body between the middle shell and the upper shell to realize the unidirectional flow of air. The first crescent-shaped valve plate on the tower-shaped piston plate and the second and third crescent-shaped valve plates of the elastic valve body realize the gas supply and flow when the micro pump is working. With the cooperation of the arc-shaped switching valve, the gas can only flow out from the inflation nozzle during the gas supply process. After the micro pump stops working, the gas can flow in from the inflation nozzle and flow out from the exhaust nozzle in the opposite direction to realize the exhaust. Therefore, there is no need for additional exhaust channels and valves, which greatly reduces the number of overall parts and achieves the purpose of reducing volume and cost. Attached image description:

[0015] Figure 1 This is a perspective view of the present invention;

[0016] Figure 2 This is a breakdown of the utility model. Figure 1 ;

[0017] Figure 3 This is a breakdown of the utility model. Figure 2 ;

[0018] Figure 4 This is a schematic diagram of the internal structure of this utility model;

[0019] Figure 5This is a schematic diagram of the drive block in this utility model;

[0020] Figure 6 This is a schematic diagram of the structure of the elastic valve body in this utility model;

[0021] Figure 7 This is a schematic diagram of the tower-shaped piston plate in this utility model;

[0022] Figure 8 This is a schematic diagram of the upper and middle shell structure of this utility model. Figure 1 ;

[0023] Figure 9 This is a schematic diagram of the upper and middle shell structure of this utility model. Figure 2 . Detailed implementation method:

[0024] The present invention will be further described below with reference to specific embodiments and accompanying drawings.

[0025] See Figures 1 to 9 As shown, a micro pump with an elastomer automatic rebound control for exhaust 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 and located inside the lower housing 1, and a steel needle 8 disposed between the drive block 7 and the piston frame 5. The upper housing 3 is provided with an inflation nozzle 31 and an exhaust nozzle 32, and an exhaust channel 34 is provided between the inflation nozzle 31 and the exhaust nozzle 32. The inflation nozzle 31 is used to supply air to the outside of the pump, and the exhaust nozzle 32 is used to exhaust air in the reverse direction. When the micro pump is working, gas flows out from the inflation nozzle 31 to supply air. When the micro pump stops working, gas enters from the inflation nozzle 31 and passes through the exhaust channel 34, thereby being discharged in the reverse direction from the exhaust nozzle 32.

[0026] The tower-shaped piston plate 4 is provided with at least one air bladder cavity 41 and an upward-opening first crescent-shaped valve plate 42. The first crescent-shaped valve plate 42 is used to connect the air bladder cavity 41 and the inner cavity of the lower housing 1 in one direction. When the micro pump is working, the first crescent-shaped valve plate 42 is pushed open by gas during the stretching process of the air bladder cavity 41, and the gas flows from the inner cavity of the lower housing 1 into the air bladder cavity 41. When the air bladder cavity 41 is compressed, the gas is squeezed out from the air bladder cavity 41 and flows out from the inflation nozzle 31.

[0027] The middle housing 2 includes an upper middle housing 21 and a lower middle housing 22 located on both sides of the tower-shaped piston plate 4. The lower middle housing 22 has at least one air inlet 221 for connecting the lower housing 1 and the cavity of the tower-shaped piston plate 4. The bottom of the upper middle housing 21 has a lower guide air passage 211 connecting the first crescent-shaped valve plate 42 and the airbag cavity 41. The top of the upper middle housing 21 has an upper guide air passage 212 connecting the airbag cavity 41 and the exhaust passage 34. The upper part is provided with a first vent 213 that connects the bottom and the top. The gas flow direction is as follows: the airbag cavity 41 is stretched to generate negative pressure, which pushes open the first crescent-shaped valve plate 42, so that the gas in the inner cavity of the lower shell 1 can enter the airbag cavity 41 from the air inlet 221 through the lower guide air channel 211. When the airbag cavity 41 is compressed to generate positive pressure, the gas is pushed from the first vent 213 into the upper guide air channel 212, and then flows out from the inflation nozzle 31 through the upper guide air channel 212.

[0028] An elastic valve body 9 for controlling gas flow is provided between the upper shell and the upper middle shell 21. This elastic valve body 9 includes an arc-shaped switching valve 91 located below the exhaust nozzle 32 and capable of blocking the exhaust nozzle 32 under air pressure; a second crescent-shaped valve plate 92 located between the inflation nozzle 31 and the upper guide air passage 212 and opening upwards; and a third crescent-shaped valve plate 93 located between the upper guide air passage 212 and the air bladder cavity 41 and opening upwards. When the air bladder cavity 41 is stretched, the third crescent-shaped valve plate 93 is subjected to negative pressure and will press tightly against the first vent hole 213, blocking the communication between the upper guide air passage 212 and the air bladder cavity 41. Simultaneously, the first crescent-shaped valve plate 93... When the toothed valve 92 is opened by negative pressure, gas flows from the lower housing 1 through the air inlet 221 and the lower guide air passage 211 to the airbag cavity 41. When the airbag cavity 41 is compressed, the first crescent-shaped valve 92 will be pressed tightly against the air inlet 221, blocking the gas in the airbag cavity 41 from flowing back to the lower housing 1. At the same time, the third crescent-shaped valve 93 will be opened by pressure, and gas will enter the upper guide air passage 212 from the first vent 213. Then, it will push open the second crescent-shaped valve 92 and push up the arc-shaped switch valve 91 to block the exhaust nozzle 32, so that the gas entering the exhaust passage 34 can only flow out from the inflation nozzle 31 and cannot flow out from the exhaust nozzle 32.

[0029] A special air passage consisting of an air inlet 221, a lower guide air passage 211, a first vent 213, and an upper guide air passage 212 is set on the middle shell 2. An elastic valve body 9 is added between the middle shell 2 and the upper shell 3 to achieve unidirectional airflow. The gas supply and flow during the operation of the micro pump are realized by the first crescent-shaped valve plate 42 on the tower-shaped piston plate 4 and the second crescent-shaped valve plate 92 and the third crescent-shaped valve plate 93 on the elastic valve body 9. With the cooperation of the arc-shaped switching valve 91, the gas can only flow out from the inflation nozzle 31 during the gas supply process. After the micro pump stops working, the gas can flow in from the inflation nozzle 31 and flow out from the exhaust nozzle 32 in the opposite direction to achieve exhaust. Therefore, no additional exhaust channel and valve are needed, which greatly reduces the number of overall parts and achieves the purpose of reducing volume and cost.

[0030] The elastic valve body 9 is provided with a second valve chamber 94 in the middle for connecting the air inlet 31 and the end of the upper guide air passage 212, and the second crescent-shaped valve plate 92 is attached to and sealed at the end of the upper guide air passage 212 in the default state; a third valve chamber 95 is provided on the side of the second valve chamber 94 for connecting the first vent 213 and the beginning of the upper guide air passage 212, and the third crescent-shaped valve plate 93 is attached to and sealed on the first vent 213 in the default state; the elastic valve body 9 is also provided with a fourth valve chamber 96 located below the arc-shaped switch valve 91 and connected to the middle of the upper guide air passage 212, and after gas is introduced into the fourth valve chamber 96, it can lift the arc-shaped switch valve 91 to seal the exhaust nozzle 32.

[0031] The tower-shaped piston plate 4 is also provided with at least a first valve chamber 43 corresponding to the first crescent-shaped valve plate 42. The upper end face of the tower-shaped piston plate 4 is provided with a plurality of sealing ribs 44 located around the airbag chamber 41 and the first valve chamber 43. The sealing ribs 44 are located around the lower guide air passage 211 so that the lower guide air passage 211 can connect the airbag chamber 41 and the first valve chamber 43.

[0032] The upper middle housing 21 is provided with a plurality of first positioning posts 214 for positioning the elastic valve body 9, and the lower middle housing 22 is provided with a plurality of second positioning posts 222 for positioning the tower-shaped piston plate 4, and the air bladder cavity 41 passes through the lower middle housing 22 and is connected to the piston frame 5.

[0033] The tower-shaped piston plate 4 has two air bladder chambers 41 arranged side by side. The piston frame 5 is T-shaped, with its lower part connected to the steel needle 8 and its upper two ends connected to the bottom of the two air bladder chambers 41 of the tower-shaped piston plate 4, respectively.

[0034] 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.

[0035] The bottom of the lower housing 1 is provided with a first air inlet groove 11 connecting the outside and the inner cavity. The lower end of the upper housing 3 is provided with at least two downwardly extending elastic latching arms 33 for matching and engaging with the lower housing 1. The outer wall of the lower housing 1 is provided with at least two locking blocks 12 for matching and engaging with the elastic latching arms 33. The outer wall of the middle housing 2 is provided with at least two first positioning grooves 20 for the elastic latching arms 33 to pass through and be positioned. The outer wall of the tower-shaped piston plate 4 is provided with at least two second positioning grooves 45 for the elastic latching arms 33 to pass through and be positioned. The outer wall of the lower housing 1 is provided with a third positioning groove 13 for accommodating the locking blocks 12 and for the elastic latching arms 33 to be inserted and positioned. The third positioning groove 13 is provided with a first stop bar 14 for limiting the elastic latching arms 33. The motor 6 is fixed to the bottom of the lower housing 1 by screws 10.

[0036] In summary, during operation, the motor 6 drives the drive block 7 to rotate, and the drive block 7, through the steel needle 8, drives the piston frame 5 to rotate and swing. During the swinging process of the piston frame 5, the air bladder cavity 41 of the tower-shaped piston plate 4 is repeatedly stretched and compressed. Furthermore, when the air bladder cavity 41 is stretched, the resulting negative pressure will generate suction to the outside. At this time, the third crescent-shaped valve plate 93, under negative pressure, will stick tightly to the first vent 213, blocking the communication between the upper guide air passage 212 and the air bladder cavity 41. Simultaneously, the first crescent-shaped valve 92 opens under negative pressure, allowing gas to flow from the lower housing 1 through the air inlet 221 and the lower guide air passage 211 into the airbag cavity 41, filling the airbag cavity 41 with gas. Furthermore, when the airbag cavity 41 is compressed, outward pressure is generated. At this time, the first crescent-shaped valve 92 is forced to press tightly against the air inlet 221, blocking the gas flow from the airbag cavity 41 back to the lower housing 1. Simultaneously, the third crescent-shaped valve 93 is forced open by pressure, allowing gas to enter through the first vent 213. The gas enters the upper guide air passage 212 and pushes open the second crescent-shaped valve plate 92, allowing gas to flow into the exhaust passage 34. After the gas enters the upper guide air passage 212, it pushes up the arc-shaped switch valve 91 to block the exhaust nozzle 32, so that the gas entering the exhaust passage 34 can only flow out from the inflation nozzle 31 and not from the exhaust nozzle 32. Thus, under the drive of the motor 6, the gas in the lower housing 1 is continuously drawn out and blown out from the inflation nozzle 31. After the gas in the lower housing 1 is drawn out, the external gas will flow out from the first... An air inlet 11 enters the lower housing 1 to continuously replenish air; furthermore, when the motor 6 stops working, the air pressure in the upper guide air passage 212 tends to be balanced. At this time, the arc-shaped switch valve 91 loses the pressure to open outward and naturally resumes contraction, releasing the pressure on the exhaust nozzle 32, so that the exhaust nozzle 32 and the inflation nozzle 31 are directly connected through the exhaust passage 34. The gas that previously flowed out from the inflation nozzle 31 will flow back through the inflation nozzle 31 and be discharged from the exhaust nozzle 32 under the condition of internal pressure, thereby realizing the release of air.

[0037] In the above-described solution, this utility model provides a miniature pump and valve integrated with an elastomer-based automatic rebound control for venting. The integrated design significantly reduces the overall size of the equipment, making the system more compact. Reducing the number of joints and seals greatly reduces the risk of fluid leakage, improving system safety and reliability. Fewer components mean lower maintenance requirements and costs. Simultaneously, a simpler system design reduces energy consumption and initial investment costs. The integrated pump and valve system allows for more precise control of fluid delivery, improving the overall system performance and efficiency. Compared to existing technologies, this utility model's miniature pump and valve integrated design 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] After adopting the above solution, the present invention also has the following technical effects:

[0039] 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;

[0040] 2. The middle shell 2 adopts a special air passage design, eliminating the use of umbrella-shaped components and ultrasonic riveting process in the existing technology;

[0041] 3. A special elastic valve body 9 is used in conjunction with the upper shell 3 and the middle shell 2 to control the gas flow direction, which realizes the function of continuous inflation and deflation once the motor stops;

[0042] 4. The oblique hole in the drive block 7 adopts a low rolling resistance design, eliminating the use of steel ball assembly in the existing technology, reducing costs, noise and current consumption.

[0043] 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 automatic elastic rebound control for air exhaust, comprising: The lower housing (1), the middle housing (2), the upper housing (3), the tower-shaped piston plate (4) disposed between the middle housing (2) and the upper housing (3), the piston frame (5) disposed at the bottom of the tower-shaped piston plate (4) and used to drive it, the motor (6) disposed at the bottom of the lower housing (1), the drive block (7) disposed on the main shaft of the motor (6) and located in the lower housing (1), and the steel needle (8) disposed between the drive block (7) and the piston frame (5), characterized in that: An air inlet (31) and an air outlet (32) are provided on the upper shell (3), and an air outlet (34) is provided between the air inlet (31) and the air outlet (32) to connect them; The tower-shaped piston plate (4) is provided with at least one air bladder cavity (41) and an upward-opening first crescent-shaped valve plate (42); The middle shell (2) includes an upper middle shell (21) and a lower middle shell (22) located on both sides of the tower-shaped piston plate (4). The lower middle shell (22) is provided with at least one air inlet (221) for connecting the lower shell (1) and the cavity of the tower-shaped piston plate (4). The bottom of the upper middle shell (21) is provided with a lower guide air passage (211) connecting the first crescent-shaped valve plate (42) and the air bladder cavity (41). The top of the upper middle shell (21) is provided with an upper guide air passage (212) connecting the air bladder cavity (41) and the exhaust passage (34). The upper middle shell (21) is provided with a first vent hole (213) that connects the bottom and the top. An elastic valve body (9) for controlling the gas flow direction is provided between the upper housing (3) and the upper middle housing (21). The elastic valve body (9) includes an arc-shaped switch valve (91) located below the exhaust nozzle (32) and capable of blocking the exhaust nozzle (32) by air pressure, a second crescent-shaped valve plate (92) located between the inflation nozzle (31) and the upper guide air passage (212) and opening upward, and a third crescent-shaped valve plate (93) located between the upper guide air passage (212) and the air bladder cavity (41) and opening upward.

2. The micro pump with automatic elastic rebound control for exhaust gas as described in claim 1, characterized in that: The elastic valve body (9) is provided with a second valve chamber (94) in the middle for connecting the air inlet (31) and the end of the upper guide air passage (212), and the second crescent-shaped valve plate (92) is attached to and sealed at the end of the upper guide air passage (212) in the default state; a third valve chamber (95) is provided on the side of the second valve chamber (94) for connecting the first vent (213) and the beginning of the upper guide air passage (212), and the third crescent-shaped valve plate (93) is attached to and sealed on the first vent (213) in the default state; a fourth valve chamber (96) is also provided on the elastic valve body (9) located below the arc-shaped switch valve (91) and connected to the middle of the upper guide air passage (212), and after gas is introduced into the fourth valve chamber (96), it can lift the arc-shaped switch valve (91) to seal the exhaust nozzle (32).

3. A micro pump with automatic elastic rebound control for exhaust as described in claim 1, characterized in that: The tower-shaped piston plate (4) is also provided with at least a first valve chamber (43) corresponding to the first crescent-shaped valve plate (42). The upper end face of the tower-shaped piston plate (4) is provided with a plurality of sealing ribs (44) located around the airbag chamber (41) and the first valve chamber (43). The sealing ribs (44) are located around the lower guide air passage (211) so that the lower guide air passage (211) can connect the airbag chamber (41) and the first valve chamber (43).

4. A micro pump with automatic elastic rebound control for exhaust as described in claim 1, characterized in that: The upper middle housing (21) is provided with a plurality of first positioning posts (214) for positioning the elastic valve body (9), and the lower middle housing (22) is provided with a plurality of second positioning posts (222) for positioning the tower-shaped piston plate (4), and the air bladder cavity (41) passes through the lower middle housing (22) and is connected to the piston frame (5).

5. A micro pump with automatic elastic rebound control for exhaust as described in claim 1, characterized in that: The tower-shaped piston plate (4) has two air bladder chambers (41) arranged side by side. The piston frame (5) is T-shaped, with its lower part connected to the steel needle (8) and its upper two ends connected to the bottom of the two air bladder chambers (41) of the tower-shaped piston plate (4).

6. A micro pump with automatic elastic rebound control for exhaust as described in claim 1, characterized in that: The drive block (7) is provided with an inclined hole (71) for docking with the steel needle (8), and the bottom of the inclined hole (71) is provided with a hemisphere (72) for contacting the steel needle (8).

7. A micro pump with automatic elastic rebound control for exhaust gas as described in any one of claims 1-6, characterized in that: The bottom of the lower housing (1) is provided with a first air inlet groove (11) that connects the outside and the inner cavity. The lower end of the upper housing (3) is provided with at least two downwardly extending elastic latching arms (33) for matching and fastening with the lower housing (1). The outer wall of the lower housing (1) is provided with at least two locking blocks (12) for matching and fastening with the elastic latching arms (33). The outer wall of the middle housing (2) is provided with at least two first positioning grooves (20) for the elastic latching arms (33) to pass through for positioning.

8. A micro pump with automatic elastic rebound control for exhaust as described in claim 7, characterized in that: At least two second positioning grooves (45) are provided on the outer wall of the tower-shaped piston plate (4) for the elastic buckle arm (33) to pass through for positioning.

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