Negative pressure vacuum miniature air pump with simplified structural design

Abstract

The utility model discloses a negative-pressure vacuum miniature air pump with a simplified structural design. 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 a steel needle arranged between the driving block and the piston frame. A crescent air inlet valve plate and a crescent air outlet valve plate are arranged on the tower-shaped piston plate; the side wall of the lower shell is provided with a first air inlet nozzle communicated with the outside and the inner cavity, and the center of the upper shell is provided with an air outlet nozzle in butt joint with the first exhaust hole. The crescent air inlet valve plate with the upward opening and the crescent air outlet valve plate with the downward opening are arranged on the tower-shaped piston plate, so that a traditional umbrella piece is replaced, and the crescent air inlet valve plate and the crescent air outlet valve plate are integrally formed parts of the tower-shaped piston plate, so that the leakproofness of long-term use can be ensured; therefore, the service life of the air pump is prolonged.

Description

Technical field:

[0001] The utility model relates to the technical field of micro air pumps, in particular to a negative pressure vacuum micro air pump with a streamlined structural design. Background technology:

[0002] A vacuum pump is a device used to create and maintain a vacuum environment. It creates a vacuum or near-vacuum state by extracting gas molecules from the inside of a container or system, reducing the air pressure to below atmospheric pressure. Vacuum pumps are widely used in many fields, including laboratory research, manufacturing, electronics, and medical equipment. They play a key role in vacuum technology and are used to create and maintain the required vacuum environment. However, existing vacuum pumps have complex structures and are affected by surges in the gas output. The noise level during operation is relatively high, and they cannot be used in devices with high requirements for noise and stability. Because existing miniature vacuum pumps are composed of many small parts, their production cost is high, assembly is complex, and the multiple parts increase losses to a certain extent, which also increases the size accordingly.

[0003] A micro vacuum pump with a Chinese patent authorization announcement number of CN206785583U includes a motor 1, a bottom shell 2, a pump chamber 3, an eccentric wheel 31, a steel ball 32, a steel needle 33, a swing frame 34, a rubber diaphragm 35, a cylinder 36, a valve plate 37, an umbrella 38, an upper cover 4, a first air inlet chamber 42, a second air inlet chamber 43, a connecting groove 44, a guide groove 45, and a sponge 5. When working, the motor 1 is powered on and rotates and drives the eccentric wheel 31 at the end of the motor shaft 11 to move together, and the eccentric wheel 31 drives the device The movement of the steel ball 32 and steel needle 33 within the eccentric hole 311 causes the rubber valve within the swing frame 34 and rubber diaphragm 35 to swing back and forth within the cylinder 36. This causes air to be drawn from the air inlet 21 of the bottom shell 2, entering the rubber diaphragm 35 through the three air inlet holes 341 in the center of the swing frame 34. The compressed air then passes through the vent hole 372 on the valve plate 37, the shank 38, the first air inlet chamber 42, the connecting groove 44, the second air inlet chamber 43, the guide groove 45, the sponge 5, and the air outlet 411 before being discharged. However, this patented solution uses the shank 38 as a one-way valve to control the flow of gas. This not only complicates the assembly structure, but also causes the shank 38 to age over time, reducing its airtightness and shortening the lifespan of the air pump.

[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 negative pressure vacuum micro air pump with a streamlined structural design.

[0006] In order to solve the above technical problems, the utility model adopts the following technical solutions: a negative pressure vacuum micro air pump with a streamlined structural 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; a plurality of crescent-shaped air inlet valve plates opening upward and a crescent-shaped air outlet valve plate opening downward are arranged on the tower-shaped piston plate; a first air inlet nozzle connecting the outside and the inner cavity is arranged on the side wall of the lower shell, and an air outlet nozzle docking with the first exhaust hole is arranged in the center of the upper shell.

[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 rods which are respectively interference-fitted and inserted into the first mounting holes at the bottom of the airbag cavity, wherein at least three crescent-shaped intake valve plates are provided and are located at the bottom of the airbag cavity, 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 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, 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.

[0011] 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.

[0012] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0013] 1. The utility model adopts a method of arranging a crescent-shaped air intake valve plate with an upward opening and a crescent-shaped air outlet valve plate with a downward opening on the tower-shaped piston plate, thereby replacing the traditional umbrella-shaped parts. Since the crescent-shaped air intake valve plate and the crescent-shaped air outlet valve plate are integrally formed parts of the tower-shaped piston plate, they can ensure the airtightness for long-term use, thereby improving the service life of the air pump. By connecting the first air intake nozzle on the lower shell to the negative pressure chamber, vacuum can be generated to generate negative pressure.

[0014] 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:

[0015] Figure 1 This is the decomposition of the utility model Figure 1 ;

[0016] Figure 2 This is the decomposition of the utility model Figure 2 ;

[0017] Figure 3 It is the internal structure diagram of the utility model;

[0018] Figure 4 It is a three-dimensional diagram of the middle tower type piston piece of the utility model;

[0019] Figure 5 It is a structural diagram of the driving block in the utility model. Specific implementation method:

[0020] The present invention will be further described below with reference to specific embodiments and accompanying drawings.

[0021] See Figures 1 to 5As shown, a negative pressure vacuum micro air pump with a streamlined structural design is provided, comprising: 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 driving 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 driving block 7 and the piston rack 5; a plurality of crescent-shaped air inlet valve plates 43 opening upward and a crescent-shaped air outlet valve plate 45 opening downward are provided on the tower-shaped piston plate 4; a first air inlet nozzle 11 connecting the outside and the inner cavity is provided on the side wall of the lower shell 1, and an air outlet nozzle 32 docking with the first exhaust hole 46 is provided in the center of the upper shell 3. A crescent-shaped air intake valve plate 43 opening upward and a crescent-shaped air outlet valve plate 45 opening downward are respectively provided on the tower-shaped piston plate 4, thereby replacing the traditional umbrella-shaped parts. Since the crescent-shaped air intake valve plate 43 and the crescent-shaped air outlet valve plate 45 are integrally formed parts of the tower-shaped piston plate 4, they can ensure the airtightness for long-term use, thereby improving the service life of the air pump. By connecting the first air intake nozzle 11 on the lower shell 1 to the negative pressure chamber, vacuuming can be achieved to generate negative pressure.

[0022] The driving block 7 is provided with an inclined hole 71 for engaging with the steel needle 8, and a hemispherical body 72 is provided at the bottom of the inclined hole 71 for contacting the steel needle 8. The hemispherical body 72 is provided at the bottom of the inclined hole 71 of the driving block 7 to contact and press against the steel needle 8, and the hemispherical body 72 is used to replace the traditional steel ball to reduce friction, thereby reducing noise, lowering costs, reducing wear, and extending service life.

[0023] 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 respectively inserted into the first mounting holes 42 at the bottom of the airbag cavities 41 with an interference fit. At least three crescent-shaped intake valve plates 43 are provided and are located at the bottom of the airbag cavities 41. The center of the piston rod 51 is provided with a first intake hole 52 that communicates with the inner cavity of the lower shell 1 and presses against the crescent-shaped 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 outlet valve plates 45 that open downward and communicate 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 that are respectively used to connect the airbag cavities 41 with the crescent-shaped 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.

[0024] 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.

[0025] 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.

[0026] 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 .

[0027] 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.

[0028] 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.

[0029] In summary, the present invention reduces component count to enhance stability and redirects airflow, allowing gas to flow through a tortuous, reverse-direction channel before exiting the exhaust port and entering the exhaust hole. This lengthens the gas flow path, allowing the gas to deflect and collide multiple times within the component, resulting in a smoother output flow, thereby reducing the operating noise of the vacuum pump and improving its silencing effectiveness.

[0030] In the present invention, the air pump is composed of a motor 6 and an air path structure. Conventional screws 9 are used to fix the motor 6 and the lower housing 1. The tower-shaped piston plate 4 uses a special air path design. The tower-shaped piston plate 4 divides the air path of the entire vacuum pump into layers, which are divided into a vacuum layer, a working layer, and an air outlet layer. The tower-shaped piston plate 4 is connected to the middle housing 2 and the piston rack 5, and then cooperates with the lower housing 1 and the motor 6 to form a vacuum layer. The upper layer of the tower-shaped piston plate 4 cooperates with the upper housing 1 to form the working layer, and the lower layer of the tower-shaped piston plate 4 cooperates with the middle housing 2 to form the air outlet layer. The upper housing 3 adopts a snap-fit ​​design, which fixes the various components together through snap-fits, eliminating the traditional screw-fixing connection method.

[0031] The specific working process is as follows: The positive and negative poles of motor 6 are energized, causing motor 6 to rotate drive block 7. The piston frame 5, equipped with a steel needle 8, rotates eccentrically and oscillates along with the drive block 7, thereby driving each pivot point of the piston frame 5 to perform piston motion. The entire structure is divided into three air chambers. Air chamber 1 consists of motor 6, lower housing 1, middle housing 2, and tower-shaped piston plate 4. An airway is provided on lower housing 1 to create negative pressure. Air chamber 2 consists of three sections. With each rotation of motor 6, the gas in each of the three sections of air chamber 2 is compressed once. The compressed gas flows forward through the annular airway of upper housing 33 and then through the stepped airway, entering air chamber 3. The two-stage annular airway and stepped airway of upper housing 3 form a one-way valve, allowing gas to be compressed from air chamber 2 into air chamber 3 in one direction, preventing backflow. After the gas in air chamber 2 is compressed into air chamber 3, the pressure in air chamber 2 becomes lower than that in air chamber 1. At this point, the tongue-shaped airway in air chamber 2 is opened by the pressure of air chamber 1, allowing the gas in air chamber 1 to re-enter air chamber 2, and this cycle repeats. With the reciprocating action, the air in chamber 1 is gradually extracted, thus forming a vacuum.

[0032] 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 nozzle 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.

[0033] After adopting the above solution, compared with the prior art, the utility model has the following effects:

[0034] 1. The fixing part of the upper shell 3 is made of PC material with an elastic snap arm 33 with a buckle design, eliminating the design of screw fasteners used in the prior art;

[0035] 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;

[0036] 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;

[0037] 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.

[0038] 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 negative pressure vacuum micro air pump with a streamlined structural 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 tower-shaped piston plate (4) is provided with a plurality of crescent-shaped intake valve plates (43) opening upward, and a crescent-shaped outlet valve plate (45) opening downward; A first air inlet nozzle (11) communicating with the outside and the inner cavity is provided on the side wall of the lower shell (1), and an air outlet nozzle (32) docking with the first exhaust hole (46) is provided at the center of the upper shell (3).

2. The negative pressure vacuum micro air pump with a streamlined structural 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 interference-fitted and inserted into the first mounting holes (42) at the bottom of the airbag cavity (41), wherein at least three crescent-shaped intake valve plates (43) are provided and are located at the bottom of the airbag cavity (41), and the center of the piston rod (51) is provided with a first intake hole (52) which is connected to the inner cavity of the lower shell (1) and presses against the crescent-shaped intake valve plate (43).

3. The negative pressure vacuum micro air pump with a streamlined structural 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 negative pressure vacuum micro air pump with a streamlined structural 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. A negative pressure vacuum micro air pump with a streamlined structure according to any one of claims 1 to 4, 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.

6. The negative pressure vacuum micro air pump with a streamlined structural design according to claim 5, 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).

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