Miniature inflator pump machine core

Abstract

The utility model discloses a miniature inflator pump machine core, which relates to the technical field of miniature inflator pump machine core sealing and comprises an air cylinder shell, a piston connecting rod assembly and a driving mechanism for driving the piston connecting rod assembly to move. The piston connecting rod assembly is arranged in an inner cavity of the air cylinder shell and comprises a connecting rod, a piston installation head, a piston and a connector, one end of the connecting rod is fixedly connected with the piston installation head, and the other end of the connecting rod is fixedly connected with the connector. The section of the piston mounting head is I-shaped, a piston mounting groove is formed in the middle of the piston mounting head, a piston is sleeved with the piston mounting groove, the outer wall of the piston is connected with the air cylinder shell in a sealed mode, and four rectangular notches are formed in the end face, away from the connecting rod, of the piston mounting head. According to the miniature inflator pump core, four right-angle notches of an air inlet hole of a piston connecting rod assembly are changed into the rectangular notches, the opening size is reduced by 50%, the arc length size of a piston supporting arc is effectively increased, the air tightness of a piston is improved, and the air compression efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of sealing technology for micro air pump cores, and in particular to a micro air pump core. Background Technology

[0002] In modern society, inflatable equipment plays an indispensable role in many fields. From daily life to industrial production, from outdoor sports to medical emergency care, the application of air pumps is becoming increasingly widespread, and their technological development has undergone a long process.

[0003] Early inflation methods relied heavily on manual tools, such as air pumps. While air pumps are simple in structure and inexpensive, they require a lot of manpower to use and have low inflation efficiency, making them only suitable for scenarios with low inflation volume and infrequent inflation, such as inflating bicycle tires. With societal progress and increasing demands, this traditional manual inflation method has gradually become insufficient to meet diverse application needs, necessitating the development of a miniature air pump mechanism.

[0004] For example, Chinese utility model patent (CN219827058U) discloses an air pump mechanism and an air pump. The air pump mechanism includes a main frame, a cylinder, a piston rod assembly, and a motor for driving the piston rod assembly. The main frame includes a bottom mounting plate and a side mounting plate perpendicularly connected to each other, and a first reinforcing plate and a second reinforcing plate connecting the bottom mounting plate and the side mounting plate. The motor is mounted on the bottom mounting plate, and the cylinder is mounted on the side mounting plate. The motor drives the piston rod assembly through a drive gear assembly. The air pump mechanism structure of this application achieves miniaturization while maintaining structural strength and stability. It solves the defects of similar existing products, such as short service life and poor structural stability, which lead to higher mechanism current, increased power consumption, decreased inflation efficiency, and longer inflation time. It can reduce resource waste and improve user experience.

[0005] However, the air inlet holes of a conventional miniature DC brushed geared motor air pump connecting rod are four right-angled notches, such as Figure 1 As shown, the large opening size and small radial support arc length of the piston affect the piston's airtightness; moreover, the poor heat dissipation of the air pump's casing affects its service life. Based on this, we designed a miniature air pump mechanism. Utility Model Content

[0006] Therefore, it is necessary to provide a miniature air pump mechanism to address the above-mentioned technical problems, which effectively increases the arc length of the piston support arc, improves the piston airtightness, and increases air compression efficiency.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0008] A miniature air pump mechanism includes a cylinder housing, a piston-connecting rod assembly, and a drive mechanism for driving the piston-connecting rod assembly. The piston-connecting rod assembly is disposed in the inner cavity of the cylinder housing and includes a connecting rod, a piston mounting head, a piston, and a connecting head. One end of the connecting rod is fixedly connected to the piston mounting head, and the other end is fixedly connected to the connecting head. The piston mounting head has an "I"-shaped cross-section with a piston mounting groove in the middle. A piston is fitted inside the piston mounting groove, and the outer wall of the piston is sealed to the cylinder housing. The end face of the piston mounting head away from the connecting rod has four rectangular notches.

[0009] In a preferred embodiment of the miniature air pump mechanism provided by this utility model, the drive mechanism includes a drive motor, a drive gear, and a main gear; a bracket is connected to the outer wall of the cylinder housing, the drive motor is installed at the lower part of the bracket, the output end of the drive motor passes through the bracket and is connected to the main gear, the drive gear is rotatably installed at the upper part of the bracket via a rotating shaft, and the drive gear and the main gear mesh and transmit power; the connecting head of the connecting rod is rotatably connected to the upper edge of the drive gear via a rotating shaft.

[0010] During operation, the drive motor drives the main gear to rotate, which in turn drives the drive gear to rotate. The drive gear then drives the piston connecting rod assembly to reciprocate within the cylinder housing, thereby achieving the inflation action.

[0011] In a preferred embodiment of the miniature air pump mechanism provided by this utility model, the front end of the cylinder housing is provided with an air outlet pipe, and a one-way valve is provided at the connection between the air outlet pipe and the cylinder housing; when the piston moves forward, the one-way valve opens, and when the piston moves backward, the one-way valve closes.

[0012] In a preferred embodiment of the miniature air pump mechanism provided by this utility model, the width of the piston mounting groove is greater than the width of the piston, and the piston can move back and forth within the piston mounting groove. When the piston connecting rod assembly moves forward, the piston, under the action of air pressure, presses against the rear plate of the piston mounting head, and the four rectangular notches are sealed, thereby forcing the gas in the cylinder housing into the outlet pipe. When the piston connecting rod assembly moves backward, the piston presses against the front plate of the piston mounting head, and the four rectangular notches are unobstructed, allowing external gas to enter the cylinder housing.

[0013] In a preferred embodiment of the miniature air pump mechanism provided by this utility model, the outer surface of the cylinder shell is a non-flat wall surface, which is used to increase the contact area with the outside air and increase the heat dissipation of the cylinder shell.

[0014] In a preferred embodiment of the miniature air pump mechanism provided by this utility model, the outer surface of the cylinder housing is provided with a plurality of grooves arranged along its axial direction.

[0015] As a preferred embodiment of the miniature air pump mechanism provided by this utility model, the outer surface of the cylinder housing is provided with a plurality of heat dissipation fins arranged along its axial direction.

[0016] In a preferred embodiment of the miniature air pump mechanism provided by this utility model, the speed ratio of the reducer of the drive mechanism is 3-10.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The present invention provides a miniature air pump mechanism, which changes the four right-angled notches of the air inlet of the piston connecting rod assembly to rectangular notches, reducing the opening size by 50%, effectively increasing the arc length of the piston support arc, improving piston air tightness, and improving air compression efficiency.

[0019] 2. The miniature air pump core provided by this utility model has a non-flat wall surface for the cylinder shell, which helps to increase the contact area with air and enhance heat dissipation. Attached Figure Description

[0020] To more clearly illustrate the solutions in this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 A schematic diagram of the air outlet of the connecting rod in an existing air pump;

[0022] Figure 2 A schematic diagram of the structure of the miniature air pump core provided by this utility model;

[0023] Figure 3 A rear view of the miniature air pump mechanism provided by this utility model;

[0024] Figure 4 This is a schematic diagram of the piston connecting rod assembly in this utility model;

[0025] Figure 5 This is a schematic diagram of the front end of the piston connecting rod assembly in this utility model;

[0026] Figure 6 This is a left view of the piston connecting rod assembly in this utility model.

[0027] The markings in the diagram are explained as follows:

[0028] 1. Cylinder housing; 2. Piston connecting rod assembly; 3. Drive gear; 4. Drive motor; 5. Exhaust pipe; 6. Bracket; 7. Main gear;

[0029] 101. Groove;

[0030] 22. Connecting rod; 23. Piston mounting head; 24. Piston; 25. Connecting head;

[0031] Piston mounting groove; 222, rectangular notch. Detailed Implementation

[0032] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0033] As described in the background section, the air inlet of a conventional micro DC brushed geared motor air pump connecting rod consists of four right-angled notches, such as... Figure 1 As shown, a large opening size and a small radial support arc length for the piston affect the piston's airtightness.

[0034] To solve this technical problem, this utility model provides a miniature air pump mechanism, which is applied to a miniature air pump mechanism.

[0035] For details, please refer to Figure 2-6 A miniature air pump mechanism includes a cylinder housing 1, a piston-connecting rod assembly 2, and a drive mechanism for driving the piston-connecting rod assembly 2. The piston-connecting rod assembly 2 is disposed in the inner cavity of the cylinder housing 1 and includes a connecting rod 21, a piston mounting head 22, a piston 23, and a connecting head 24. One end of the connecting rod 21 is fixedly connected to the piston mounting head 22, and the other end is fixedly connected to the connecting head 24. The piston mounting head 22 has an "I"-shaped cross-section with a piston mounting groove 221 in the middle. The piston 23 is fitted inside the piston mounting groove 221, and the outer wall of the piston 23 is sealed to the cylinder housing 1. The end face of the piston mounting head 22 away from the connecting rod 21 has four rectangular notches 222, which are the air inlets.

[0036] The present invention provides a miniature air pump mechanism, which changes the four right-angled notches of the air inlet of the piston connecting rod assembly 2 to rectangular notches 222. The opening size is reduced by about 50% compared with the existing right-angled notches, which effectively increases the arc length of the piston 23 support arc, improves the air tightness of the piston 23, and improves the air compression efficiency.

[0037] Example 1

[0038] Please refer to Figure 2-6 A miniature air pump mechanism includes a cylinder housing 1, a piston rod assembly 2, and a drive mechanism for driving the piston rod assembly 2. The piston rod assembly 2 is disposed in the inner cavity of the cylinder housing 1 and includes a connecting rod 21, a piston mounting head 22, a piston 23, and a connecting head 24. One end of the connecting rod 21 is fixedly connected to the piston mounting head 22, and the other end is fixedly connected to the connecting head 24. The piston mounting head 22 has an "I" shaped cross section with a piston mounting groove 221 in the middle. The piston mounting groove 221 has a front plate on the front side and a rear plate on the rear side. The piston 23 is fitted inside the piston mounting groove 221, and the outer wall of the piston 23 is sealed to the cylinder housing 1.

[0039] The piston mounting head 22 has four rectangular notches 222 on its end face away from the connecting rod 21. The four rectangular notches 222 are the air intake holes. The drive mechanism includes a drive motor 4, a drive gear 3, and a main gear 7. A bracket 6 is connected to the outer wall of the cylinder housing 1. The drive motor 4 is installed at the lower part of the bracket 6. The output end of the drive motor 4 passes through the bracket 6 and is connected to the main gear 7. The drive gear 3 is rotatably mounted on the upper part of the bracket 6 through a rotating shaft, and the drive gear 3 and the main gear 7 mesh and transmit power. The connecting head 24 of the connecting rod 21 is rotatably connected to the upper edge of the drive gear 3 through a rotating shaft.

[0040] During operation, the drive motor 4 drives the main gear 7 to rotate, the main gear 7 drives the drive gear 3 to rotate, and the drive gear 3 drives the piston connecting rod assembly 2 to reciprocate within the cylinder housing 1, thereby achieving the inflation action.

[0041] The cylinder housing 1 has an exhaust pipe 5 at its front end, and a one-way valve is provided at the connection between the exhaust pipe 5 and the cylinder housing 1. When the piston 23 moves forward, the one-way valve opens, and when the piston 23 moves backward, the one-way valve closes.

[0042] The width of the piston mounting groove 221 is greater than the width of the piston 23, and the piston 23 can move back and forth within the piston mounting groove 221. When the piston connecting rod assembly 2 moves forward, the piston 23, under the action of air pressure, presses against the rear plate of the piston mounting head 22, and the four rectangular notches 222 are sealed, thereby forcing the gas in the cylinder housing 1 into the exhaust pipe 5. When the piston connecting rod assembly 2 moves backward, the piston 23 presses against the front plate of the piston mounting head 22, and the four rectangular notches 222 are unobstructed, allowing external gas to enter the cylinder housing 1.

[0043] Example 2

[0044] The miniature air pump mechanism provided in Example 1 has been further optimized, specifically, as follows: Figure 2 and Figure 3As shown, the outer surface of the cylinder housing 1 is a non-flat wall surface, which is used to increase the contact area with the outside air and increase the heat dissipation of the cylinder housing 1. Specifically, the outer surface of the cylinder housing 1 is provided with a number of grooves 101 arranged along its axial direction.

[0045] In other embodiments, the outer surface of the cylinder housing 1 is provided with a plurality of heat dissipation fins (not shown in the figure) arranged axially or radially at the bottom of the groove 101. The height of the heat dissipation fins does not exceed the height of the protrusion on the outer surface of the cylinder housing 1, so as to avoid the subsequent terminal being unable to be installed due to excessive height.

[0046] The present invention provides a miniature air pump core in which the cylinder shell 1 is designed as a non-flat wall surface, which helps to increase the contact area with air and enhance heat dissipation.

[0047] Example 3

[0048] The miniature air pump mechanism provided in Example 1 is further optimized. Specifically, the speed ratio of the reducer of the drive mechanism is designed to be 3 to 10. By designing the number of meshing teeth of the main gear 7 and the drive gear 3, the compression efficiency can be adjusted by regulating the output speed, which helps to reduce the vibration and noise of the whole machine.

[0049] The micro air pump mechanism provided by this utility model is used as follows:

[0050] During operation, the drive motor 4 drives the main gear 7 to rotate, the main gear 7 drives the drive gear 3 to rotate, and the drive gear 3 drives the piston connecting rod assembly 2 to reciprocate within the cylinder housing 1. When the piston connecting rod assembly 2 moves forward, the piston 23, under the action of air pressure, presses against the rear plate of the piston mounting head 22, the four rectangular notches 222 are sealed, and the one-way valve at the air outlet pipe 5 is opened, thereby forcing the gas in the cylinder housing 1 into the air outlet pipe 5.

[0051] When the piston connecting rod assembly 2 moves backward, the piston 23 is pressed against the front plate of the piston mounting head 22, the four rectangular notches 222 are unobstructed, and the one-way valve at the air outlet pipe 5 is closed. At this time, the outside gas enters the cylinder housing 1 to prepare for the next inflation. This process is repeated to realize the inflation action.

[0052] Because the air intake port of the piston connecting rod assembly 2 is changed from four right-angled notches to rectangular notches 222, the opening size is reduced by 50%, which effectively increases the arc length of the front plate supporting the piston 23, ensuring that the piston 23 does not deform, improving air tightness, and increasing air compression efficiency; at the same time, the outer surface of the cylinder housing 1 is a non-flat wall surface, which is used to increase the contact area with the outside air and increase the heat dissipation of the cylinder housing 1.

[0053] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0054] Obviously, the embodiments described above are only some embodiments of this utility model, not all embodiments. The accompanying drawings show preferred embodiments of this utility model, but do not limit the patent scope of this utility model. This utility model can be implemented in many different forms; rather, the purpose of providing these embodiments is to provide a more thorough and comprehensive understanding of the disclosure of this utility model. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this utility model specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the patent protection scope of this utility model.

Claims

1. A miniature air pump mechanism, characterized in that, It includes a cylinder housing (1), a piston rod assembly (2), and a drive mechanism for driving the piston rod assembly (2) to move; The piston connecting rod assembly (2) is disposed in the inner cavity of the cylinder housing (1), and includes a connecting rod (21), a piston mounting head (22), a piston (23) and a connector (24). One end of the connecting rod (21) is fixedly connected to the piston mounting head (22), and the other end is fixedly connected to the connector (24). The cross-section of the piston mounting head (22) is "I" shaped, with a piston mounting groove (221) in the middle. A piston (23) is fitted inside the piston mounting groove (221). The outer wall of the piston (23) is sealed to the cylinder housing (1). The piston mounting head (22) has four rectangular notches (222) on one end face away from the connecting rod (21).

2. The miniature air pump mechanism according to claim 1, characterized in that, The drive mechanism includes a drive motor (4), a drive gear (3), and a main gear (7); a bracket (6) is connected to the outer wall of the cylinder housing (1), the drive motor (4) is installed at the lower part of the bracket (6), the output end of the drive motor (4) passes through the bracket (6) and connects to the main gear (7), the drive gear (3) is rotatably installed at the upper part of the bracket (6) through a rotating shaft, and the drive gear (3) and the main gear (7) mesh and transmit power; the connector (24) of the connecting rod (21) is rotatably connected to the upper edge of the drive gear (3) through a rotating shaft.

3. The miniature air pump mechanism according to claim 2, characterized in that, The cylinder housing (1) is provided with an exhaust pipe (5) at the front end, and a one-way valve is provided at the connection between the exhaust pipe (5) and the cylinder housing (1); when the piston (23) moves forward, the one-way valve opens, and when the piston (23) moves backward, the one-way valve closes.

4. The miniature air pump mechanism according to claim 3, characterized in that, The width of the piston mounting groove (221) is greater than the width of the piston (23), and the piston (23) can move back and forth within the piston mounting groove (221).

5. The miniature air pump mechanism according to claim 1, characterized in that, The outer surface of the cylinder housing (1) is a non-flat wall surface, which is used to increase the contact area with the outside air.

6. The miniature air pump mechanism according to claim 5, characterized in that, The outer surface of the cylinder housing (1) is provided with a plurality of grooves (101) arranged along its axial direction.

7. A miniature air pump mechanism according to claim 5, characterized in that, The outer surface of the cylinder housing (1) is provided with several heat dissipation fins arranged along its axial direction.

8. The miniature air pump mechanism according to claim 1, characterized in that, The speed ratio of the reducer in the drive mechanism is 3 to 10.

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