Piston shaft for air pump

Abstract

The utility model discloses a piston shaft for an air pump, which comprises a piston shaft body, two sections of straight knurls are arranged on the shaft surface of one end of the piston shaft body, an annular step is arranged between the two sections of straight knurls, the end surface of one end of the piston shaft body far away from the straight knurls is a spherical surface, and the end surface of the other end of the piston shaft body far away from the straight knurls is a spherical surface. The shaft diameter of the section, close to the spherical end face, of the piston shaft body is smaller than that of the piston shaft body. According to the atomization air pump, the situations that the piston shaft is loosened, retreats and rotates in the using process of the atomization air pump can be effectively prevented, and meanwhile the service life of the atomization air pump can be effectively prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of air pump transmission systems, and particularly relates to a piston shaft for an air pump. Background Art

[0002] During the use of home medical nebulizer air pumps, its transmission system operates in high-speed, high-friction working conditions. When the air pump motor is running, the load is large, which can easily cause the piston shaft and piston frame to loosen, retreat, and rotate. The bottom end face of the piston shaft of a traditional nebulizer air pump is flat, the amount of residual lubricating grease is very small, and the contact area with the eccentric wheel is large. During the operation of the motor, the eccentric wheel is loaded with a large load and has a high temperature, which will cause the eccentric wheel to be worn out after continuous long-term operation, making it difficult to operate efficiently for a long time. Utility Model Content

[0003] The technical problem to be solved by the present invention is to address the deficiencies of the above-mentioned prior art and to provide a piston shaft for an air pump, which can effectively prevent the air pump piston shaft and the piston frame from loosening, retreating, rotating, and eccentric wheel wearing.

[0004] The technical solution adopted by the utility model is: a piston shaft for an air pump, comprising a piston shaft body, wherein the axial surface of one end of the piston shaft body is provided with straight knurling, the straight knurling is provided with two sections, an annular step is provided between the two sections of straight knurling, the end surface of the piston shaft body away from the straight knurling is a spherical surface, and the axial diameter of a section of the piston shaft body close to the spherical end surface is smaller than the axial diameter of the piston shaft body.

[0005] Preferably, the straight knurling has the same diameter as that of the piston shaft body, and the length of the straight knurling at the end of the piston shaft body is shorter than the length of the other section of the straight knurling.

[0006] Preferably, the other end of the piston shaft body is a spherical surface with an R of 3.6 mm.

[0007] Preferably, the diameter of a section of the piston shaft body close to the spherical end surface is the same as the diameter of the step formed between the two sections of straight knurling.

[0008] The beneficial effects of the present invention are:

[0009] (1) Two sections of straight knurling are designed, and a step is opened between the two sections of straight knurling, that is, a step surface is formed; after the piston shaft is plastic-coated and embedded in the piston frame, the plastic-coated material fills and flows into the step surface, which can effectively prevent the piston shaft from retreating and loosening. At the same time, the two sections of straight knurling are set to effectively prevent the piston shaft from rotating;

[0010] (2) The end of the piston shaft connected to the eccentric wheel is designed to be spherical, and the diameter of the piston shaft near the spherical end is reduced. After being installed on the eccentric wheel of the motor assembly, the contact area between the piston shaft and the hole wall and the bottom of the hole is reduced, and the lubricating grease can remain in the gap between the bottom curved surface of the piston shaft and the plane of the eccentric wheel and in the gap of the piston shaft with reduced diameter, which can provide cooling and lubrication for a long time, greatly reducing the friction between the piston shaft and the eccentric wheel, thereby improving the service life of the air pump.

[0011] The utility model can effectively prevent the piston shaft from being loosened, withdrawn and self-rotated during the use of the atomizing air pump, and can effectively prolong the service life of the atomizing air pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural diagram of the utility model;

[0013] Figure 2 This is a diagram of the use state of the utility model;

[0014] Figure 3 It is a working schematic diagram of the utility model.

[0015] In the figure: 1. Piston shaft body; 2. Straight knurling; 3. Step; 4. Spherical surface; 5. Piston holder; 6. Eccentric wheel; 7. Air inlet; 8. Air outlet. DETAILED DESCRIPTION

[0016] The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0017] Example

[0018] like Figure 1 、 Figure 2 and Figure 3 As shown, the piston shaft for the air pump provided in this embodiment includes a piston shaft body 1, and two sections of straight knurling 2 are provided on the axial surface of one end of the piston shaft body 1 connected to the piston frame 4. For the convenience of description, this embodiment is described using the first section of straight knurling 2 and the second section of straight knurling 2. The first section of straight knurling 2 is located at the end where the piston shaft body 1 is connected to the piston frame 4, and the second section of straight knurling 2 is located on the axial surface of the piston shaft body 1 close to the first section of straight knurling 2. An annular step 3 is provided between the first section of straight knurling 2 and the second section of straight knurling 2, and the length of the first section of straight knurling 2 is less than the length of the second section of straight knurling 2;

[0019] The diameter of the step 3 between the two sections of straight knurling 2 is smaller than the diameter of the piston shaft body 1, so that the first section of straight knurling 2 and the second section of straight knurling 2 form a step 3 surface. After the piston shaft body 1 is overmolded and embedded in the piston holder 4, the overmolded material fills and flows into the step 3 surface, which can effectively prevent the piston shaft from retreating and loosening. At the same time, the two sections of straight knurling 2 effectively prevent the piston shaft from rotating.

[0020] The end face of the piston shaft body 1 installed with the eccentric wheel 6 on the motor assembly is an R3.6mm spherical surface, and the shaft diameter of a section of the piston shaft body 1 close to the spherical end face is smaller than the shaft diameter of the piston shaft body 1; after the piston shaft body 1 is installed on the eccentric wheel 6 of the motor assembly, the contact area between the piston shaft and the hole wall and the bottom surface of the hole is reduced, and the lubricating grease can remain in the gap between the bottom curved surface of the piston shaft and the plane of the eccentric wheel 6 and in the section where the piston shaft diameter is reduced, which can be used for cooling and lubrication for a long time, greatly reducing the friction between the piston shaft and the eccentric wheel 6, thereby increasing the service life of the air pump; in the actual production process, the shaft diameter of a section of the piston shaft body 1 close to the spherical end face can be made the same as the shaft diameter of the step 3 formed between the two sections of straight knurling 2, which can facilitate production and processing.

[0021] The above is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any modification and replacement based on the technical solution and utility model concept provided by the present invention should be included in the protection scope of the present invention.

Claims

1. A piston shaft for an air pump, comprising a piston shaft body (1), one end axial surface of the piston shaft body (1) being provided with straight knurling (2), characterized in that: The straight knurling (2) is provided with two sections, an annular step (3) is provided between the two sections of the straight knurling (2), the end face of the piston shaft body (1) away from the straight knurling (2) is a spherical surface, and the shaft diameter of a section of the piston shaft body (1) close to the spherical end face is smaller than the shaft diameter of the piston shaft body (1).

2. The piston shaft for an air pump according to claim 1, characterized in that: The axial diameter of the straight knurling (2) is the same as the axial diameter of the piston shaft body (1), and the length of the straight knurling (2) located at the end of the piston shaft body (1) is shorter than the length of the other section of the straight knurling (2).

3. The piston shaft for an air pump according to claim 2, characterized in that: The other end of the piston shaft body (1) is a spherical surface with an R of 3.6 mm.

4. The piston shaft for an air pump according to claim 3, characterized in that: The diameter of a section of the piston shaft body (1) close to the spherical end surface is the same as the diameter of the step (3) formed between the two sections of straight knurling (2).

Images