Inflator pump

Abstract

An inflator pump comprises a cylinder body, a cylinder cover, a driving mechanism and a piston assembly installed in the cylinder body, and is characterized in that the driving mechanism comprises an eccentric gear, a cam structure is arranged in the eccentric gear, the eccentric gear is meshed with an output gear of a motor, an eccentric shaft on the eccentric gear is rotationally connected with the lower end of a connecting rod, and meanwhile the connecting rod is connected with the cylinder cover. The other end of the eccentric shaft is connected with the cam on the other side, and the eccentric gear and the cam are rotatably arranged on the support. The utility model has the advantages of simple and reasonable structure, stable and energy-saving rotation, high air inlet efficiency, uniform and rapid air exhaust, effective improvement of air inflation efficiency, convenience in assembly and maintenance, and prolonged service life.

Description

Technical Field

[0001] The utility model relates to the technical field of inflation equipment, and particularly relates to an air pump. Background Art

[0002] An air pump, also called an air compressor, air inflater, is an inflation tool that works by the operation of a motor. The working principle of the air pump is as follows: when the motor runs and sucks air, the valve of the communicating vessel is pushed open by the air pressure of the atmosphere, and the air enters the air cylinder. When inflating a tire, the valve is closed by the air pressure in the air cylinder, and the air then enters the tire. The air pump has a wide range of application fields, including automobiles, motorcycles, bicycles, balls, rubber boats, etc.

[0003] Traditional air pumps generally include a cylinder block and a cylinder head. When the piston moves upward, the intake valve closes and the exhaust valve opens, and the air is discharged from the exhaust port through the exhaust valve. When the piston moves downward, the intake valve opens and the air enters the cylinder block, while the exhaust valve closes. The traditional air pump has the following defects during use:

[0004] First, the traditional exhaust method usually installs an exhaust valve plate on the central hole. Although this method can meet the basic exhaust requirements, in some special scenarios, such as when high-efficiency and uniform exhaust are required, the central hole exhaust method may have limitations.

[0005] Second, in the traditional intake method, the valve plate is usually installed on the piston, and the piston ring is installed on the outside of the piston. Although this design can achieve the basic inflation function, it has a complex structure, is prone to air leakage if assembled improperly, and is also very inconvenient for maintenance.

[0006] Third, for the traditional air pump bracket, due to the special shape of the bracket, the motor screw holes are often blocked, making it difficult to install the screws, which affects the installation efficiency and stability of the air pump.

[0007] Fourth, the traditional eccentric wheel is to set an eccentric pin on the gear, and the weight and center of the cam on the opposite side are seriously unequal, which is easy to cause the driving mechanism to deflect and generate noise.

[0008] Therefore, it is necessary to improve the structure of the traditional air pump to make the air pump easy to assemble, have high inflation efficiency, and be convenient for maintenance. Summary of the Invention

[0009] The technical problem to be solved by the utility model is to provide an air pump with a simple and reasonable structure and stable transmission in view of the above technical status.

[0010] The technical solution adopted by the present utility model to solve the above technical problems is as follows: An air pump includes a cylinder block, a cylinder head, a driving mechanism, and a piston assembly installed in the cylinder block. It is characterized in that: the driving mechanism includes an eccentric gear, the inside of the eccentric gear has a cam structure, the eccentric gear is meshed with the output gear of the motor, the eccentric shaft on the eccentric gear is rotatably connected to the lower end of the connecting rod, and at the same time, the other end of the eccentric shaft is connected to a cam on the other side. The eccentric gear and the cam are rotatably arranged on the bracket.

[0011] Furthermore, the bracket is formed by the butting of an upper cover and a lower cover. After the upper cover and the lower cover are butted, bearing seats are formed on the left and right sides. The motor is installed outside the left side of the bracket. The central rotating shaft of the eccentric gear is connected to the bearing installed in the left bearing seat, and the camshaft is connected to the bearing installed in the right bearing seat, making the transmission more stable.

[0012] Furthermore, the cylinder block includes a bracket and a cylinder liner. A plurality of air outlet holes are annularly and evenly distributed at the upper end of the cylinder liner. An air outlet hole valve is arranged above the air outlet holes. The air outlet hole valve is installed on the cylinder liner by screws. The piston assembly includes a piston and a piston ring. The piston ring is a valve sheet piston ring integrated by a valve sheet and a piston ring. The valve sheet piston ring is installed on the piston to form an integral part with the piston, greatly simplifying the structure, facilitating assembly, and improving the air inflation efficiency.

[0013] Still further, the upper end of the cylinder liner is a reduced-diameter section for butting and connecting with the cylinder head. The cylinder head is hermetically butted at the upper end of the cylinder liner. A partition is horizontally arranged inside the cylinder liner corresponding to the lower part of the reduced-diameter section. The air outlet holes are annularly and evenly arranged on the partition. The middle position of the partition is thickened and provided with a threaded hole. A corresponding installation hole is provided in the middle of the air outlet hole valve sheet. The air outlet hole valve sheet is installed on the partition by screws, which can ensure that the gas can be discharged evenly and quickly, reduce the impact of the air flow on a single point, and reduce noise.

[0014] Furthermore, the piston assembly is arranged in the cylinder liner below the partition so as to be movable up and down. The piston is a connecting rod piston composed of a piston part and a connecting rod. The lower end of the connecting rod extends out of the cylinder liner and is connected to the driving mechanism installed on the bracket. An air inlet hole is provided on the piston part. The valve sheet piston ring is butted and sleeved on the upper end of the piston part.

[0015] Furthermore, the driving mechanism includes a motor. The motor is installed on the outer side surface of the bracket. The bracket is formed by the butting of an upper cover and a lower cover. After the upper cover and the lower cover are butted, an installation notch for the motor is formed on the side surface. Screw holes are provided at the edge of the installation notch. The motor is fixed on the side surface of the bracket by screws. Through holes for facilitating the passing of the screws are provided on the wall surfaces of the upper cover and the lower cover corresponding to the upper part of the screw holes, avoiding the screws being blocked during the installation process and facilitating the installation.

[0016] Finally, the cam structure and the cam are arranged symmetrically left and right, so that the center of gravity of the whole movement mechanism is on the center line, reducing the yaw phenomenon and making the transmission more stable.

[0017] Compared with the prior art, the advantages of the present utility model are as follows: The eccentric gear is designed with a cam structure on the circular part, which can reduce the problem of the center of gravity yaw of the driving mechanism, improve the rotational stability, save energy and reduce noise; The air outlet holes on the cylinder liner are improved from one in the traditional design to multiple annularly distributed ones, which can ensure that the gas can be discharged evenly and quickly, reduce the impact of the air flow on a single point, improve the stability and durability of the air pump, and at the same time reduce the noise; The piston ring and the valve plate are designed as an integral part and directly installed on the piston, which greatly simplifies the structure, is convenient for assembly, and improves the inflation efficiency; The bracket adopts the design of the upper cover and the lower cover being joined together, which is convenient for installation and disassembly. There are specific slot holes above the screw holes for installing the motor, which avoids the screws being blocked during the installation process, making the installation of the motor smooth and convenient. The structure of the present utility model is simple and reasonable, with high intake efficiency, uniform and fast exhaust, effectively improving the inflation efficiency, and at the same time being convenient for assembly and maintenance, effectively extending the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of an embodiment of the present utility model;

[0019] Figure 2 is a schematic internal structure diagram of the cylinder liner;

[0020] Figure 3 is a longitudinal sectional view of the cylinder liner;

[0021] Figure 4 is an exploded view of the piston assembly;

[0022] Figure 5 is a longitudinal sectional view after the cylinder head, cylinder liner and piston assembly are assembled;

[0023] Figure 6 is a schematic structural diagram of the motor installation position on the bracket;

[0024] Figure 7 is a sectional view after the motor is installed;

[0025] Figure 8 is an exploded view of an embodiment of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0027] As Figures 1 to 8As shown in the figure, an air pump includes a cylinder block, a cylinder head 1, a driving mechanism, and a piston assembly installed in the cylinder block. The driving mechanism includes an eccentric gear 7 with a cam structure inside. The eccentric gear 7 meshes with the output gear 61 of the motor 6. The eccentric shaft 8 on the eccentric gear 61 is rotatably connected to the lower end of the connecting rod 4. At the same time, the other end of the eccentric shaft 8 is connected to the cam 9 on the other side. The eccentric gear 7 and the cam 9 are rotatably arranged on the bracket 3. The cylinder block includes the bracket 3 and the cylinder liner 2. An air outlet 11 is provided on the side of the cylinder head 1. A plurality of air outlet holes 22 are annularly and evenly distributed above the upper end of the cylinder liner 2. An air outlet valve 20 is provided above the air outlet holes 22. The air outlet valve 20 is installed on the cylinder liner 2 through a screw a. The piston assembly includes a piston 4 and piston rings. The piston rings are a valve plate piston ring 5 integrally formed by a valve plate 52 and a piston ring 51. The valve plate piston ring 5 is directly installed on the piston 4 to form an integral part with the piston 4.

[0028] The specific structure is as follows: The upper end of the cylinder liner 2 is a reduced-diameter section that is hermetically joined to the cylinder head 1. The cylinder head 1 is hermetically joined to the upper end of the cylinder liner 2. A partition plate 21 is horizontally provided inside the cylinder liner 2 and below the reduced-diameter section. In this embodiment, there are 6 air outlet holes. The air outlet holes 22 are annularly and evenly arranged on the partition plate 21. This can ensure that the gas can be discharged evenly and quickly, reduce the impact of the air flow on a single point, improve the stability and durability of the air pump. Since the gas is discharged from multiple air outlet holes 22 at the same time, the air flow velocity of a single air outlet hole 22 is reduced, and the noise generated by the air flow is reduced. The middle position of the partition plate 21 is thickened and provided with a threaded hole 23. The middle part of the air outlet valve plate 20 is provided with a corresponding mounting hole 201. The air outlet valve plate 20 is installed on the partition plate 21 through a screw a, which is not only convenient for disassembly, but also firmly installed and not easy to fall off.

[0029] The piston assembly is movably arranged up and down below the partition plate 21 inside the cylinder liner. The piston 4 is a connecting rod piston composed of a piston part 41 and a connecting rod 42. The lower end of the connecting rod 42 extends out of the cylinder liner 2 and is connected to the driving mechanism installed on the bracket 3. Four air inlet holes 40 are provided on the piston part 41. The valve plate piston ring 5 is sleeved on the upper end of the piston part 51 in a butted manner. The driving mechanism includes a motor 6. The motor 6 is installed on the outer side of the bracket 3. In this embodiment, it is installed on the left side. The bracket 3 is formed by butting an upper cover 31 and a lower cover 32, which is convenient for installation and disassembly. After the upper cover 31 and the lower cover 32 are butted, an installation slot for the motor 6 is formed on the left side. Screw holes are provided at the edge of the installation slot. The motor 6 is fixed to the side of the bracket 3 through a screw b. Through holes c that facilitate the passage of the screw b are provided on the walls of the upper cover 31 and the lower cover 32 above the corresponding screw holes.

[0030] An eccentric gear 7 is installed on the inner side of the bracket 3. The eccentric gear 7 has a cam structure inside, that is, the circular part of the eccentric gear 7 has a cam shape. The periphery of the circular part is a gear. The eccentric gear 7 meshes with the output gear 61 of the motor 6. The eccentric shaft 8 of the eccentric gear 7 is rotatably connected to the lower end of the connecting rod 42. By rotating the eccentric gear 7, the connecting rod 42 is driven to move up and down, so as to realize the up and down movement of the piston 4 in the cylinder liner 2. After the upper cover 31 and the lower cover 32 are joined together, bearing seats are formed on the left and right sides. The central rotating shaft 71 of the eccentric gear 7 is connected to the bearing 10 installed in the left bearing seat. One end of the eccentric shaft 8 is connected to the eccentric gear 7, and the other end of the eccentric shaft 8 passes through the connecting hole 421 at the lower end of the connecting rod 42 and is connected to the cam 9. The camshaft 91 is connected to the bearing 10 installed in the right bearing seat. Usually, the cam structure and the cam 9 are arranged symmetrically about the center line of the connecting rod 42 to reduce yaw.

[0031] In addition, the material of the bracket 3 can be selected as a material with a certain strength and toughness to ensure the stability and durability of the bracket 3.

[0032] The working principle is as follows: When the motor 6 is started and the motor 6 rotates, the eccentric gear 7 rotates. By rotating the eccentric gear 7, the connecting rod 42 is driven to move up and down. When the eccentric shaft 7 is at the bottom, the piston 4 moves downward, such as gas entering the cylinder liner 2. When the eccentric shaft 7 is at a high position, the piston 4 moves upward, and the gas is discharged from the air outlet hole 22 of the cylinder liner 2, enters the external gas storage tank through the air outlet 11 of the cylinder head 1 for storage and pressurization, and then is discharged through the exhaust port.

[0033] In this embodiment, a cam structure is designed on the circular part of the traditional eccentric gear 7, which can reduce the problem of the center of gravity yaw of the driving mechanism and improve the rotational stability; and one air outlet hole 22 is improved to a plurality of annularly distributed ones, which can ensure that the gas can be discharged evenly and quickly, reduce the impact of the air flow on a single point, and improve the inflation efficiency. Since the gas is discharged from a plurality of air outlet holes 22 at the same time, the air flow velocity of a single air outlet hole 22 is reduced, the noise generated by the air flow is reduced, and the uniform exhaust mode reduces the wear of the cylinder liner 2 and the air outlet valve piece 20, and prolongs the service life; the piston ring and the valve piece are designed as an integral part and directly installed on the piston 4, which greatly simplifies the structure, reduces the failure rate, improves the intake efficiency, shortens the inflation time, and is convenient to replace, reducing the maintenance cost; the bracket 3 adopts the design of the upper cover 31 and the lower cover 32 joined together, which is convenient for installation and disassembly. A specific slot c is provided above the screw hole for installing the motor 6 to avoid the screw being blocked during the installation process, making the installation of the motor 6 smooth and convenient.

[0034] The above are only the preferred embodiments of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present utility model, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present utility model.

Claims

1. An air pump, comprising a cylinder block, a cylinder head, a drive mechanism, and a piston assembly installed in the cylinder block, characterized in that: The driving mechanism includes an eccentric gear which has a cam structure inside. The eccentric gear meshes with the output gear of the motor. The eccentric shaft on the eccentric gear is rotatably connected to the lower end of the connecting rod. At the same time, the other end of the eccentric shaft is connected to a cam on the other side. The eccentric gear and the cam are rotatably arranged on the bracket.

2. The inflator according to claim 1, wherein: The bracket is formed by the mating of an upper cover and a lower cover. After the upper cover and the lower cover are mated, bearing seats are formed on the left and right sides. The motor is installed on the outer left side of the bracket. The central rotating shaft of the eccentric gear is connected to the bearing installed in the left bearing seat, and the camshaft is connected to the bearing installed in the right bearing seat.

3. The inflator according to claim 1, wherein: The cylinder block includes a bracket and a cylinder liner. A plurality of air outlet holes are annularly and evenly distributed at the upper end of the cylinder liner. An air outlet valve is provided above the air outlet holes. The air outlet valve is installed on the cylinder liner by screws. The piston assembly includes a piston and a piston ring. The piston ring is a valve sheet piston ring integrated by a valve sheet and a piston ring. The valve sheet piston ring is installed on the piston to form an integral part with the piston.

4. The inflator according to claim 3, wherein: The upper end of the cylinder liner is a reduced-diameter section for mating connection with the cylinder head. The cylinder head is hermetically mated to the upper end of the cylinder liner. A partition is transversely provided inside the cylinder liner, corresponding to the lower part of the reduced-diameter section. The air outlet holes are annularly and evenly opened on the partition. The middle position of the partition is thickened and provided with a threaded hole. The middle part of the air outlet valve sheet is provided with a corresponding mounting hole. The air outlet valve sheet is installed on the partition by screws.

5. The air pump according to claim 4, wherein: The piston assembly is vertically movably arranged inside the cylinder liner below the partition. The piston is a connecting rod piston composed of a piston part and a connecting rod. The lower end of the connecting rod extends out of the cylinder liner and is connected to the driving mechanism installed on the bracket. An air inlet hole is opened on the piston part. The valve sheet piston ring is coaxially sleeved on the upper end of the piston part.

6. The inflator according to claim 1, wherein: The driving mechanism includes a motor. The motor is installed on the outer side surface of the bracket. The bracket is formed by the mating of an upper cover and a lower cover. After the upper cover and the lower cover are mated, an installation notch for the motor is formed on the side surface. Screw holes are opened at the edge of the installation notch. The motor is fixed on the side surface of the bracket by screws. Through holes for facilitating the passing of screws are provided on the wall surfaces of the upper cover and the lower cover corresponding to the upper part of the screw holes.

7. The air pump according to any one of claims 1 to 6, characterized in that: The cam structure and the cam are arranged symmetrically left and right.

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