A pump piston

Abstract

The utility model discloses a kind of inflator piston, including the piston body for being installed in the inside of the cylinder body of inflator, the piston body includes inner tube sleeve and the outer tube sleeve being arranged to inner tube sleeve outside, the outer tube sleeve outside is equipped with upper outer edge and lower outer edge, annular groove for installing rubber ring is formed between the upper outer edge and lower outer edge, floating gap is left between rubber ring and annular groove upper and lower, the outer wall of rubber ring and cylinder inner wall are closely contacted;The inner tube sleeve bottom is equipped with the air inlet bottom plate with first air inlet hole distribution, air inlet bottom plate below is equipped with air inlet through slot, air inlet through slot is passed through annular groove both ends;First flexible pad capable of covering first air inlet hole is inserted in the middle of air inlet bottom plate;Second air inlet hole is equipped between the outer tube sleeve bottom and the inner tube sleeve bottom, second flexible pad capable of covering second air inlet hole is equipped on the mounting protrusion of outer tube sleeve bottom.

Description

Technical Field

[0001] This utility model relates to the technical field of air pumps, specifically to an air pump piston. Background Technology

[0002] As a core component of inflation tools, the piston structure of an air pump directly determines its inflation efficiency, manufacturing cost, and service life. In existing technologies, air pump pistons generally adopt a complex structure of "air chamber + double air cushions": an air chamber needs to be separately opened at the bottom of the piston, and air inlet and air outlet cushions need to be installed on both sides of the piston respectively. At the same time, corresponding air inlet and air outlet cushions adapted to the piston air cushions need to be set on both sides of the air chamber to realize the switching between air intake and air exhaust.

[0003] This design has significant drawbacks: Firstly, the need for coordination among multiple components (air chamber, dual air cushions) makes piston processing cumbersome, requiring separate machining of the air chamber cavity, air cushion mounting groove, and sealing surface. Furthermore, the high precision requirements for component assembly not only increase processing time but also raise material waste rates, ultimately leading to higher overall processing and material costs. Secondly, its working principle relies on airflow pressure to open and close the air cushion. The air cushion only opens when the air pressure reaches a threshold during inflation, affecting pumping efficiency. There is also a timing conflict between pumping and inflation, meaning that when the piston moves upward to pump air, some of the already inflated gas can easily flow back through the not-fully-sealed air cushion, causing pressure loss (depressurization). This is especially problematic when inflating items requiring higher air pressure, such as bicycles and basketballs, requiring repeated inflation, significantly reducing inflation efficiency.

[0004] Therefore, existing air pump pistons still have technical pain points that urgently need to be addressed in terms of structural simplification, cost control, and air pumping efficiency. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide an air pump piston in view of the above-mentioned shortcomings of the prior art.

[0006] To achieve its purpose, this utility model adopts the following technical solution: An air pump piston includes a piston body for installation inside the cylinder of the air pump. The piston body includes an inner sleeve and an outer sleeve disposed outside the inner sleeve. The outer sleeve has an upper outer edge and a lower outer edge, and an annular groove for installing a rubber ring is formed between the upper outer edge and the lower outer edge. A floating gap is left between the rubber ring and the annular groove. The outer wall of the rubber ring is in close contact with the inner wall of the cylinder. The bottom of the inner tube sleeve is provided with an air intake base plate with first air intake holes distributed thereon. An air intake groove is provided below the air intake base plate, and the air intake groove is connected to both ends of the through annular groove. A first flexible pad that can cover the first air intake hole is inserted in the middle of the air intake base plate. A second air intake hole is provided between the bottom of the outer tube sleeve and the bottom of the inner tube sleeve. A second flexible pad that can cover the second air intake hole is provided on the mounting protrusion at the bottom of the outer tube sleeve. When the piston body moves up or down inside the cylinder, the rubber ring moves down or up inside the annular groove to expose the gap, allowing air to enter the inner sleeve through the air inlet groove.

[0007] Preferably, the socket at the top of the inner tube is used to insert the inner air pump, and the threaded interface at the top of the outer tube is used to thread the outer air pump.

[0008] Preferably, the outer side of the second flexible pad is provided with an arc-shaped protective plate.

[0009] The beneficial effects of this utility model are: This invention eliminates the separate air chamber and auxiliary air cushion assembly found in the prior art. Air intake control can be achieved solely through the air intake base plate at the bottom of the inner tube sleeve, the second air intake hole of the outer tube sleeve, and the double flexible pads. This design eliminates multiple parts, eliminates the need to process complex air chambers, reduces the complexity of processing procedures and the amount of materials used, and effectively controls processing and material costs.

[0010] The outer upper and lower outer edges of the outer sleeve of this utility model form an annular groove, and the rubber ring has floating gaps at both the upper and lower ends of the annular groove. When the piston moves up and down, the rubber ring can float flexibly along the annular groove according to the change of air pressure inside the cylinder. On the one hand, this avoids the problem of jamming of the fixed sealing component and improves the smoothness of piston movement; on the other hand, the rubber ring can adapt to the processing error of the inner wall of the cylinder during the floating process, always maintaining close contact with the inner wall of the cylinder, ensuring the sealing effect and preventing air pressure leakage.

[0011] The first flexible pad on the inner tube sleeve air inlet base plate of this utility model can cover the first air inlet hole, and the second flexible pad on the outer tube sleeve mounting protrusion can cover the second air inlet hole. When pumping air, pushing the air pump handle moves the piston body upward in the cylinder, allowing air to enter through the outer tube sleeve. The second flexible pad deforms downward, opening the second air inlet hole and achieving air pumping. When inflating air, pulling the air pump handle moves the piston body downward or upward in the cylinder, causing the rubber ring to move up or down in the annular groove, allowing air to enter the air inlet channel. The first flexible pad deforms upward, separating from the air inlet base plate, opening the first air inlet hole and achieving bidirectional inflation. This design fundamentally solves the pressure loss problem of existing technologies, increases the effective inflation volume per pump, and significantly improves inflation efficiency. Attached Figure Description

[0012] For ease of explanation, this utility model is described in detail below with reference to the specific embodiments and accompanying drawings.

[0013] Figure 1 This is a perspective view of this embodiment; Figure 2 This is the front view of this embodiment; Figure 3 for Figure 2 Sectional view at point AA; Figure 4 This is a top view of this embodiment; Figure 5 This is a bottom view of this embodiment; Figure 6 This is a perspective view from a low angle in this embodiment; Figure 7 This is a top view of the embodiment without the first flexible pad and the second flexible pad; Figure 8 This is a bottom view of the embodiment without the first flexible pad and the second flexible pad; Figure 9 This is a perspective view taken from below, with the first and second flexible pads removed from this embodiment.

[0014] In the picture: 1-Piston body; 11-Inner sleeve; 111-Inlet base plate; 112-First air inlet hole; 113-Insertion port; 12-Outer sleeve; 121-Second air inlet hole; 122-Mounting protrusion; 123-Threaded interface; 13-Upper outer edge; 14-Lower outer edge; 15-Annular groove; 16-Inlet passage groove; 17-Arc-shaped guard plate; 2-First flexible pad; 3-Second flexible pad. Detailed Implementation

[0015] The following are specific embodiments of the present invention, described in conjunction with the accompanying drawings, to further illustrate the technical solution of the present invention. However, the present invention is not limited to these embodiments. Specific details, such as particular configurations and components, are provided in the following description merely to aid in a comprehensive understanding of the embodiments of the present invention. Therefore, those skilled in the art should understand that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present invention. Furthermore, for clarity and brevity, descriptions of known functions and structures have been omitted.

[0016] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0017] like Figure 1-9The image shows a pump piston provided in this embodiment, including a piston body 1 for installation inside the cylinder of the pump. The piston body 1 includes an inner sleeve 11 and an outer sleeve 12 disposed outside the inner sleeve 11. The outer wall of the outer sleeve 12 is integrally formed with an upper outer edge 13 and a lower outer edge 14 in the middle. An annular groove 15 is formed between the upper outer edge 13 and the lower outer edge 14. A rubber ring (not shown) is fitted inside the annular groove 15. The height of the rubber ring is slightly less than the height of the annular groove 15, so that there is a floating gap between the rubber ring and the upper and lower groove walls of the annular groove 15. The outer diameter of the rubber ring is adapted to the inner diameter of the pump cylinder, and it can be in close contact with the inner wall of the cylinder under natural conditions.

[0018] The inner sleeve 11 is a hollow tubular structure with an integrally formed air intake base plate 111 at its bottom. Several first air intake holes 112 are evenly distributed on the air intake base plate 111 for air to enter the interior of the inner sleeve 11. An air intake groove 16 is provided below the air intake base plate 111, which passes through both ends of the annular groove 15.

[0019] A first flexible pad 2 is inserted into the middle of the air intake base plate 111 via a slot. The diameter of the first flexible pad 2 is larger than the distribution range of the first air intake holes 112 on the air intake base plate 111. Under normal conditions, it can completely cover all the first air intake holes 112. It can only deform upward and open under negative pressure.

[0020] The bottom of the outer sleeve 12 is provided with a second air inlet 121, and a second flexible pad 3 is installed on the bottom protrusion 122 of the outer sleeve 12. The area of ​​the second flexible pad 3 can completely cover the second air inlet 121. In addition, an arc-shaped protective plate 17 is provided on the outer side of the second flexible pad 3. The protective plate is integrally formed with the bottom of the outer sleeve 12. The curvature of the protective plate 17 is adapted to the deformation trajectory of the second flexible pad 3, which can prevent foreign objects from contacting or airflow from damaging the second flexible pad 3.

[0021] The top of the inner tube sleeve 11 is provided with a socket 113, the inner diameter of which is adapted to the outer diameter of the inner air tube, and the inner air tube is inserted by means of interference fit; the top of the outer tube sleeve 12 is provided with a threaded interface, which can be connected to the outer air tube by thread.

[0022] The working process of this utility model: Air extraction stage: When the air pump handle is pushed to move the piston body 1 upward in the cylinder, air enters through the outer sleeve, and the second flexible pad 3 deforms downward, causing the second air inlet 121 to open, thus achieving air extraction.

[0023] Inflation stage: When the handle of the air pump is pulled, the piston body 1 moves downward or upward in the cylinder. The rubber ring moves up or down in the annular groove 15. Air enters the air inlet groove 16. The first flexible pad 2 deforms upward and separates from the air inlet base plate 111. The first air inlet 112 opens, realizing bidirectional inflation.

[0024] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0025] In the description of this application, it should be understood that the terms "upper" and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0026] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

Claims

1. An air pump piston, characterized in that, The device includes a piston body (1) for installation inside the cylinder of an air pump. The piston body (1) includes an inner sleeve (11) and an outer sleeve (12) disposed outside the inner sleeve (11). The outer sleeve (12) has an upper outer edge (13) and a lower outer edge (14) on its outer side. An annular groove (15) for installing a rubber ring is formed between the upper outer edge (13) and the lower outer edge (14). A floating gap is left between the rubber ring and the annular groove (15) at the top and bottom. The outer wall of the rubber ring is in close contact with the inner wall of the cylinder. The bottom of the inner sleeve (11) is provided with an air intake base plate (111) with first air intake holes (112) distributed thereon. The bottom of the air intake base plate (111) is provided with an air intake channel (16), and the air intake channel (16) is connected to both ends of the through annular groove (15). A first flexible pad (2) that can cover the first air intake hole (112) is inserted in the middle of the air intake base plate (111). A second air intake hole (121) is provided between the bottom of the outer sleeve (12) and the bottom of the inner sleeve (11). A second flexible pad (3) that can cover the second air intake hole (121) is provided on the mounting protrusion (122) at the bottom of the outer sleeve (12). When the piston body (1) moves up or down in the cylinder, the rubber ring moves down or up in the annular groove (15) to expose the gap, so that air enters the inner sleeve (11) through the air inlet groove (16).

2. The air pump piston according to claim 1, characterized in that, The insertion port (113) at the top of the inner sleeve (11) is used to insert the inner air pump pipe, and the threaded interface at the top of the outer sleeve (12) is used to thread the outer air pump pipe.

3. The air pump piston according to claim 1, characterized in that, The second flexible pad (3) has an arc-shaped protective plate (17) on its outer side.

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