Miniature air pump with low rolling resistance and mute design

Abstract

The utility model discloses a miniature air pump with low rolling resistance and mute design. Comprising a lower shell 1, a middle shell 2, an upper shell 3, a tower-shaped piston piece 4 arranged between the middle shell 2 and the upper shell 3, a piston frame 5 arranged at the bottom of the tower-shaped piston piece 4 and used for pushing the tower-shaped piston piece 4 to work, a motor 6 arranged at the bottom of the lower shell 1, a driving block 7 arranged on a main shaft of the motor 6 and located in the lower shell 1, and a steel needle 8 arranged between the driving block 7 and the piston frame 5. The driving block 7 is provided with an inclined hole site 71 used for being in butt joint and clamped with the steel needle 8, and a hemisphere 72 used for making contact with the steel needle 8 is arranged at the bottom of the inclined hole site 71. The hemisphere 72 is arranged at the bottom of the inclined hole 71 of the driving block 7 to be in contact and abut against the steel needle 8, traditional steel balls are replaced by the hemisphere 72 to reduce friction force, noise can be reduced, cost is low, abrasion can be reduced, and the service life is prolonged.

Description

Technical field:

[0001] The utility model relates to the technical field of micro air pumps, in particular to a micro air pump with a low rolling resistance and silent design. Background technology:

[0002] A micro air pump is a small device typically used for gas transmission or pressurization. They are very compact in design and can be integrated into a variety of portable or space-constrained applications, such as medical equipment (such as ventilators, blood glucose monitors), laboratory instruments, environmental monitoring systems, automated control equipment, drones, and consumer electronics. Maintaining or improving the performance of the pump while reducing its size is an ongoing challenge. With the increase in portable applications, improving the energy efficiency of the pump and extending battery life are becoming increasingly important, and reducing production costs without sacrificing quality and performance is becoming increasingly important. Because existing micro air pumps are composed of many small parts, their production costs are high and assembly is complex. In addition, the multiple parts increase losses to a certain extent, which also increases the size accordingly.

[0003] China Patent Authorization Announcement No. CN 205064268 U discloses a flat micro air pump with a pressure self-relieving valve, comprising a motor 1, an eccentric cap 11, a fixing seat 2, a bell cup seat 3, an umbrella holder seat 4, an upper cover 5, an umbrella holder 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, and the connecting rod frame 8 then drives the bell cup 7 to perform a cyclic zooming motion, with the two umbrella holders 6 alternately opening the umbrella pin holes, thereby pumping gas from the air inlet 16 to the air outlet 15. However, the patented technical solution employs a steel ball 10 at the bottom end of the eccentric hole 12 on the eccentric cap 11, which is correspondingly connected to the steel needle 9. Although the steel ball can reduce friction and extend the service life of the product, it is noisy and expensive.

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

[0005] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a micro air pump with a low rolling resistance and silent design.

[0006] In order to solve the above technical problems, the utility model adopts the following technical solutions: a micro air pump with a low rolling resistance and silent design, comprising: a lower shell, a middle shell, an upper shell, a tower-shaped piston plate arranged between the middle shell and the upper shell, a piston rack arranged at the bottom of the tower-shaped piston plate and used to promote its work, a motor arranged at the bottom of the lower shell, a drive block arranged on the motor main shaft and located in the lower shell, and a steel needle arranged between the drive block and the piston rack, the drive block is provided with an inclined hole for connecting with the steel needle, and the bottom of the inclined hole is provided with a hemisphere for contacting the steel needle.

[0007] Furthermore, in the above technical solution, the tower-shaped piston plate is provided with at least three airbag cavities for alternating compression, and the piston rack is provided with at least three piston columns which are respectively interference fit and inserted into the first mounting holes at the bottom of the airbag cavity, wherein the bottom of the airbag cavity is provided with a crescent-shaped intake valve plate opening upward, and the center of the piston column is provided with a first intake hole which is connected to the inner cavity of the lower shell body and presses against the bottom of the crescent-shaped intake valve plate.

[0008] Furthermore, in the above technical solution, an air outlet collecting groove is provided between the bottom of the tower-shaped piston plate and the middle shell body, and at least three crescent-shaped air outlet valve plates opening downward and connected to the air outlet collecting groove are provided on the tower-shaped piston plate, and at least three exhaust structures for connecting the airbag cavity and the crescent-shaped air outlet valve plates are provided at the bottom of the upper shell body.

[0009] Furthermore, in the above technical solution, the air outlet collecting groove is located between the three airbag cavities, and a first exhaust hole for outward exhaust is provided at the center of the air outlet collecting groove; the exhaust structure includes a first convex ring formed at the bottom of the upper shell and capable of interference fit and extending into the airbag cavity, a first protrusion block formed at the bottom of the upper shell and pressed against the crescent-shaped air outlet valve plate, and a first strip-shaped slot hole formed at the bottom of the upper shell and extending into the first convex ring and the first protrusion block.

[0010] Furthermore, in the above technical solution, a first air inlet groove communicating with the outside and the inner cavity is provided at the bottom of the lower shell, and an air outlet nozzle connected to the first exhaust hole is provided at the center of the upper shell.

[0011] Furthermore, in the above technical solution, a centering hole for positioning the piston frame is provided at the center of the middle shell, a centering convex portion pressed against the centering hole is provided at the top center of the piston frame, a first sleeve portion sleeved on the steel needle is provided at the bottom center of the piston frame, and the inclined hole is eccentrically located on one side of the driving block.

[0012] Furthermore, in the above technical solution, the lower end of the upper shell is provided with at least three elastic snap arms extending downward and used to match and snap with the lower shell, the outer wall of the lower shell is provided with at least three positioning blocks used to match and snap with the elastic snap arms, and the outer wall of the middle shell is provided with at least three first positioning grooves for the elastic snap arms to pass through for positioning.

[0013] Furthermore, in the above technical solution, the first positioning groove protrudes upward from the upper end surface of the middle shell, and at least three second positioning grooves corresponding to the first positioning grooves are provided on the outer wall of the tower-shaped piston piece.

[0014] Furthermore, in the above technical solution, a reinforcing rib is provided on the inner side of the elastic snap arm, wherein a first locking groove corresponding to the reinforcing rib is provided in the first positioning groove, and a first notch for the reinforcing rib to pass through is provided in the middle of the locking block; a third positioning groove for accommodating the locking block and for the elastic snap arm to be inserted into the locking position is provided on the outer wall of the lower shell, and a first gear bar for limiting the elastic snap arm is provided in the third positioning groove.

[0015] Furthermore, in the above technical solution, the motor is fixed to the bottom of the lower shell by screws, and a first positioning column protruding from the upper end surface and inserted into the middle shell for positioning is provided on the inner wall of the lower shell, and a first positioning post is provided on the middle shell for the first positioning post to be inserted and positioned.

[0016] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0017] 1. In the utility model, a hemisphere is set at the bottom of the inclined hole of the driving block to contact and press the steel needle. The hemisphere is used to replace the traditional steel ball to reduce friction, which not only reduces noise, but also has low cost, reduces wear and tear, and improves service life.

[0018] 2. In the utility model, a piston rack is used to alternately perform piston squeezing action on the three airbag cavities of the tower-shaped piston plate, thereby continuously pumping the gas in the lower shell into the airbag cavity, and then discharging it from the first exhaust hole through the air outlet collecting groove, and utilizing the one-way action of the crescent-shaped air inlet valve plate and the crescent-shaped air outlet valve plate to realize the one-way flow of airflow, thereby completing the pumping of air. Description of the drawings:

[0019] Figure 1 This is the decomposition of the utility model Figure 1 ;

[0020] Figure 2 This is the decomposition of the utility model Figure 2 ;

[0021] Figure 3 It is the internal structure diagram of the utility model;

[0022] Figure 4 It is a three-dimensional diagram of the middle tower type piston piece of the utility model;

[0023] Figure 5 It is a structural diagram of the driving block in the utility model. Specific implementation method:

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

[0025] See Figures 1 to 5As shown, a micro air pump with a low rolling resistance and silent design includes: a lower shell 1, a middle shell 2, an upper shell 3, a tower-shaped piston plate 4 arranged between the middle shell 2 and the upper shell 3, a piston rack 5 arranged at the bottom of the tower-shaped piston plate 4 and used to drive it to work, a motor 6 arranged at the bottom of the lower shell 1, a drive block 7 arranged on the main shaft of the motor 6 and located in the lower shell 1, and a steel needle 8 arranged between the drive block 7 and the piston rack 5. 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 with the steel needle 8. The hemisphere 72 is provided at the bottom of the inclined hole 71 of the drive block 7 to contact and press the steel needle 8, and the hemisphere 72 is used to replace the traditional steel ball to reduce friction. This not only reduces noise, but also has low cost, reduces wear, and increases service life.

[0026] The tower-shaped piston plate 4 is provided with at least three airbag cavities 41 for alternating compression, and the piston frame 5 is provided with at least three piston rods 51, which are interference-fitted into the first mounting holes 42 at the bottom of the airbag cavities 41. A crescent-shaped air intake valve plate 43 opening upward is provided at the bottom of the airbag cavity 41, and a first air intake hole 52 is provided at the center of the piston rod 51, which communicates with the inner cavity of the lower shell 1 and presses against the bottom of the crescent-shaped air intake valve plate 43. An air outlet 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 air outlet valve plates 45 opening downward and communicating with the air outlet collection grooves 44 are provided on the tower-shaped piston plate 4. The bottom of the upper shell 3 is provided with at least three exhaust structures 31, which are respectively used to connect the airbag cavities 41 with the crescent-shaped air outlet valve plates 45. The gas outlet collection groove 44 is located between the three airbag cavities 41, and a first exhaust hole 46 for outward exhaust is provided at the center of the gas outlet collection groove 44. The exhaust structure 31 includes a first protruding ring 311 formed on the bottom of the upper shell 3 and capable of interference fit and extending into the airbag cavity 41, a first protruding block 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 protruding ring 311 and the first protruding block 312. The piston holder 5 alternately applies piston compression to the three airbag cavities 41 of the tower-shaped piston plate 4, thereby continuously pumping gas from the lower shell 1 into the airbag cavity 41 and then out of the first exhaust hole 46 through the gas outlet collection groove 44. The unidirectional action of the crescent-shaped air inlet valve plate 43 and the crescent-shaped air outlet valve plate 45 achieves unidirectional air flow, completing the pressurized pumping of gas.

[0027] The bottom of the lower shell 1 is provided with a first air inlet groove 11 communicating with the outside and the inner cavity, and the center of the upper shell 3 is provided with an air outlet nozzle 32 connected to the first exhaust hole 46.

[0028] A centering hole 21 for positioning the piston frame 5 is provided at the center of the middle shell 2, a centering protrusion 53 is provided at the top center of the piston frame 5 to press against the centering hole 21, a first sleeve portion 54 is provided at the bottom center of the piston frame 5 to be sleeved on the steel needle 8, and the inclined hole 71 is eccentrically located on one side of the driving block 7.

[0029] The lower end of the upper shell 3 is provided with at least three elastic snap arms 33 extending downward and used to match and snap with the lower shell 1, the outer wall of the lower shell 1 is provided with at least three positioning blocks 12 used to match and snap with the elastic snap arms 33, and the outer wall of the middle shell 2 is provided with at least three first positioning grooves 22 for the elastic snap arms 33 to pass through for positioning.

[0030] The first positioning groove 22 protrudes upward from the upper end surface of the middle housing 2 , and at least three second positioning grooves 47 corresponding to the first positioning grooves 22 are provided on the outer wall of the tower-shaped piston plate 4 .

[0031] A reinforcing rib 331 is provided on the inner side of the elastic snap arm 33, wherein a first locking groove 221 corresponding to the reinforcing rib 331 is provided in the first positioning groove 22, and a first notch 121 for the reinforcing rib 331 to pass through is provided in the middle of the locking block 12; a third positioning groove 13 for accommodating the locking block 12 and for the elastic snap arm 33 to be inserted and locked is provided on the outer wall of the lower shell 1, and a first gear bar 14 for limiting the elastic snap arm 33 is provided in the third positioning groove 13.

[0032] The motor 6 is fixed to the bottom of the lower shell 1 by screws 9. The inner wall of the lower shell 1 is provided with a first positioning column 15 protruding from the upper end surface and inserted into the middle shell 2 for positioning, and the middle shell 2 is provided with a first positioning pin 23 for the first positioning pin to be inserted and positioned.

[0033] To sum up, in the present invention, a crescent-shaped outlet valve plate 45 opening downward and a crescent-shaped inlet valve plate 43 opening upward are provided on the tower-shaped piston plate 4, and a double-layer air path design with a laminated structure is formed together with the middle shell 2 and the upper shell 3, and the upper surface of the upper shell 3 is concave to form an air duct of the air outlet, and the piston frame 5 has a cylindrical air inlet duct that is tightly matched with the tower-shaped piston plate 4, and an air inlet hole is opened on the air inlet duct, which cooperates with the crescent-shaped air inlet duct of the tower-shaped piston plate 4.

[0034] The following is an example of the process of an airbag cavity 41 being stretched and compressed by the piston frame 5: when the airbag cavity 41 of the tower-shaped piston plate 4 is stretched and its volume increases, the crescent-shaped air outlet valve plate 45 will press against the first protrusion block 312, so that the gas cannot enter the air outlet collection groove 44 from the first strip-shaped slot 313, and the gas will flow in from the first air inlet hole 52 on the piston frame 5 to push open the crescent-shaped air inlet valve plate 43 at the bottom of the airbag cavity 41. At this time, the outside gas enters the lower shell 1 through the first air inlet groove 11 of the lower shell 1, and then enters the airbag cavity 41 of the tower-shaped piston plate 4 through the first air inlet hole 52 of the piston frame 5; when the airbag cavity 41 is compressed and its volume decreases The crescent-shaped air inlet valve plate 43 will be close to the first air inlet hole 52 on the piston frame 5 to close the valve. At this time, the air flow in the airbag cavity 41 is squeezed and flows into the first linear slot hole 313 of the upper shell 3, pushing up the crescent-shaped air outlet valve plate 45 to open. At this time, the gas in the airbag cavity 41 enters the air outlet collecting groove 44 after pushing open the crescent-shaped air outlet valve plate 45 of the upper airway, and then enters the air outlet nozzle 32 of the upper shell 3 through the air outlet collecting groove 44 to be discharged; in the above manner, the piston frame 5 repeatedly pushes the three airbag cavities 41 on the tower-shaped piston plate 4 to be alternately stretched and compressed, and the gas in the upper shell 1 is continuously drawn into the air outlet nozzle 32 of the upper shell 3 for discharge, thereby realizing the air pump function.

[0035] After adopting the above solution, compared with the prior art, the micro air pump of the utility model has fewer parts, is easy to assemble, has low cost, and has a simple structure. The rotating shaft also has a low rolling resistance design, which reduces noise and improves the energy efficiency of the pump. It also has the following effects:

[0036] 1. The fixing part of the upper shell 3 is made of PC material with an elastic buckle arm 33 with a buckle design, eliminating the design of screw fasteners used in the prior art;

[0037] 2. The rubber tower piston 4 adopts a laminated upper and lower air layer design, eliminating the design of the umbrella-shaped parts and ultrasonic riveting process used in the prior art;

[0038] 3. The piston frame 5 and the tower-shaped piston 4 are designed to be tightly matched, eliminating the design of using Latin assembly and then cutting the handle in the existing technology;

[0039] 4. The inclined hole in the driving block 7 adopts a low rolling resistance design, eliminating the design of using steel balls for assembly in the prior art, thereby reducing costs, noise and current consumption.

[0040] Of course, the above description is only a specific embodiment of the present invention and is not intended to limit the scope of implementation of the present invention. Any equivalent changes or modifications made based on the structure, features and principles described in the scope of the patent application of the present invention should be included in the scope of the patent application of the present invention.

Claims

1. A micro air pump with low rolling resistance and silent design, comprising: A lower housing (1), a middle housing (2), an upper housing (3), a tower-shaped piston piece (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 piece (4) and used to drive the tower-shaped piston piece (4), 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 in the lower housing (1), and a steel needle (8) disposed between the drive block (7) and the piston frame (5), characterized in that: The driving block (7) is provided with an inclined hole (71) for docking with the steel needle (8), and a hemispherical body (72) for contacting the steel needle (8) is provided at the bottom of the inclined hole (71).

2. The micro air pump with low rolling resistance and silent design according to claim 1, characterized in that: The tower-shaped piston plate (4) is provided with at least three airbag cavities (41) for alternate compression, and the piston frame (5) is provided with at least three piston rods (51) which are respectively inserted into the first mounting holes (42) at the bottom of the airbag cavity (41) with interference fit, wherein the bottom of the airbag cavity (41) is provided with a crescent-shaped air intake valve plate (43) opening upward, and the center of the piston rod (51) is provided with a first air intake hole (52) which is connected to the inner cavity of the lower shell (1) and presses against the bottom of the crescent-shaped air intake valve plate (43).

3. The micro air pump with low rolling resistance and silent design according to claim 2, characterized in that: An air outlet collecting 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 air outlet valve plates (45) are provided on the tower-shaped piston plate (4) and are open downward and connected to the air outlet collecting groove (44). The bottom of the upper shell (3) is provided with at least three exhaust structures (31) for connecting the airbag cavity (41) and the crescent-shaped air outlet valve plates (45) respectively.

4. The micro air pump with low rolling resistance and silent design according to claim 3, characterized in that: The air outlet collecting groove (44) is located between the three airbag cavities (41), and a first exhaust hole (46) for exhausting air outward is provided at the center of the air outlet collecting 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 fitting and extending into the airbag cavity (41), a first protruding block (312) formed on the bottom of the upper shell (3) and pressed 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 protruding block (312).

5. The micro air pump with low rolling resistance and silent design according to claim 2, characterized in that: The bottom of the lower shell (1) is provided with a first air inlet groove (11) communicating with the outside and the inner cavity, and the center of the upper shell (3) is provided with an air outlet nozzle (32) docking with the first exhaust hole (46).

6. The micro air pump with low rolling resistance and silent design according to claim 1, characterized in that: A centering hole (21) for positioning the piston frame (5) is provided at the center of the middle housing (2), a centering protrusion (53) pressed against the centering hole (21) is provided at the top center of the piston frame (5), a first sleeve portion (54) sleeved on the steel needle (8) is provided at the bottom center of the piston frame (5), and the inclined hole (71) is eccentrically located on one side of the driving block (7).

7. A micro air pump with low rolling resistance and silent design according to any one of claims 1 to 6, characterized in that: The lower end of the upper shell (3) is provided with at least three elastic snap-fit ​​arms (33) extending downward and used for matching and snapping with the lower shell (1); the outer wall of the lower shell (1) is provided with at least three positioning blocks (12) used for matching and snapping with the elastic snap-fit ​​arms (33); and the outer wall of the middle shell (2) is provided with at least three first positioning slots (22) for the elastic snap-fit ​​arms (33) to pass through for positioning.

8. The micro air pump with low rolling resistance and silent design according to claim 7, characterized in that: The first positioning groove (22) protrudes upward from the upper end surface of the middle housing (2), and at least three second positioning grooves (47) corresponding to the first positioning grooves (22) are provided on the outer wall of the tower-shaped piston plate (4).

9. The micro air pump with low rolling resistance and silent design according to claim 7, characterized in that: A reinforcing rib (331) is provided on the inner side of the elastic snap arm (33), wherein a first locking groove (221) corresponding to the locking rib (331) is provided in the first positioning groove (22), and a first notch (121) for the reinforcing rib (331) to pass through is provided in the middle of the locking block (12); a third positioning groove (13) for accommodating the locking block (12) and for the elastic snap arm (33) to be inserted and locked is provided on the outer wall of the lower shell (1), and a first gear bar (14) for limiting the position of the elastic snap arm (33) is provided in the third positioning groove (13).

10. The micro air pump with low rolling resistance and silent design according to claim 7, characterized in that: The motor (6) is fixed to the bottom of the lower housing (1) by screws (9), and a first positioning column (15) protruding from the upper end surface and inserted into the middle housing (2) for positioning is provided on the inner wall of the lower housing (1), and a first positioning pin (23) for the first positioning pin (2) to be inserted and positioned is provided on the middle housing (2).

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