Air compressor structure

Abstract

To provide an air compressor structure having a cylinder, a piston, a cover, and a backflow prevention piece.SOLUTION: A cylinder includes a plurality of air holes. A piston is coupled in the cylinder in a reciprocating manner. A cover is attached to the cylinder. The cover includes a pressing pillar. An inner space of the cylinder and an inner space of the cover are in communication with each other through the air holes. A backflow prevention piece is provided in a movable manner between the cylinder and the cover. When the piston makes a first stroke, the piston moves closer to the air holes to compress the air in the cylinder. The compressed air passes through the air holes, thereafter pushes up the backflow prevention piece, and flows into the cover. When the piston makes a second stroke, a vacuum is formed inside the cylinder at the moment the piston moves away from the air holes. The backflow prevention piece is driven by the vacuum and the compressed air to cover and seal the air holes.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an air compressor structure. [Background technology]

[0002] The main structure of an air compressor is to use a motor to drive a piston, which performs a reciprocating compression motion in a cylinder, and then the compressed air can be filled into an expansion object connected to it.

[0003] In the air flow path of the above-mentioned air compressor, a rubber stopper is usually placed in combination with a spring, and the rubber stopper is driven by the elastic force of the spring to close the flow path, or the rubber stopper is driven by compressed air to overcome the elastic force of the spring and open the flow path, thereby being used as a check valve. However, in actual operation, due to limitations caused by the elastic force of the spring and the hardness of the rubber stopper, it is often not possible to completely close the flow path, and there are also cases where the elastic force of the spring is too strong, preventing the flow path from opening, or where the spring becomes fatigued over time.

[0004] Therefore, how to propose improvements to address the above problems is a topic that the relevant engineers need to consider. Summary of the Invention [Problem to be solved by the invention]

[0005] The present invention provides an air compressor structure that provides a backflow prevention function to a flow path by a simple combination of components. [Means for solving the problem]

[0006] The air compressor structure of the present invention comprises a cylinder, a piston, a cover, and a backflow prevention piece. The cylinder has a plurality of air holes. The piston is reciprocally connected within the cylinder. The cover is assembled to the cylinder. The cover has a pressure post. The internal spaces of the cylinder and the cover are connected to each other via the air hole. The backflow prevention piece is movably disposed between the cylinder and the cover. When the piston performs a first stroke, it approaches the air hole and compresses the air in the cylinder. The compressed air passes through the air hole, pushes up the backflow prevention piece, and flows into the cover. When the piston performs a second stroke, a vacuum is formed within the cylinder at the moment the piston leaves the air hole. The backflow prevention piece is driven by the vacuum and compressed air to cover and seal the air hole. [Effects of the Invention]

[0007] Based on the above, the air compressor structure of the present invention has a cover attached to a cylinder, and after the piston compresses the air in the cylinder, the compressed air is transmitted to the cover through a plurality of air holes in the cylinder. The air compressor structure further includes a backflow prevention piece movably disposed between the cover and the cylinder, which is pushed up by the influence of the air flow or can seal the air holes, and the function of preventing gas passage or backflow is achieved by combining the reciprocating motion of the piston within the cylinder.

[0008] More specifically, when the piston performs its first stroke (forward stroke), it compresses the air in the cylinder and transmits the compressed air to the cover through the air hole. At this time, the compressed air also drives the backflow prevention piece, pushing it up against the air hole so that the compressed air can flow smoothly into the cover. Conversely, when the piston performs its second stroke (return stroke), a vacuum is created in the cylinder as the piston leaves the air hole. Because the compressed air is still present in the cover, a pressure difference between the vacuum and the compressed air is generated against the backflow prevention piece, driving it to cover and seal the air hole. Therefore, the movable backflow prevention piece can move correspondingly by combining the movement of the piston and the resulting compressed air or vacuum, thereby achieving the desired backflow prevention function. Compared to prior art backflow prevention valves, the backflow prevention piece of the present invention undoubtedly achieves the desired needs with a simple structure, achieves the effect of simplifying components, and simultaneously solves the problems of the related prior art. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a schematic diagram of an air compressor structure according to an embodiment of the present invention; [Figure 2] FIG. 2 is an exploded view illustrating some components of the air compressor structure. [Figure 3] FIG. 2 is an exploded view illustrating some components of the air compressor structure from different perspectives. [Figure 4] FIG. 2 is a partial cross-sectional view illustrating the air compressor structure from a three-dimensional perspective. [Figure 5] FIG. 2 is a partial cross-sectional view of the air compressor structure. [Figure 6] FIG. 2 is a partial cross-sectional view of the air compressor structure. [Figure 7A] FIG. 4 is a partial cross-sectional view of an air compressor structure according to another embodiment of the present invention. [Figure 7B] FIG. 4 is a partial cross-sectional view of an air compressor structure according to another embodiment of the present invention. [Figure 8]FIG. 10 is a partial cross-sectional view of an air compressor structure according to yet another embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0010] FIG. 1 is a schematic diagram of an air compressor structure according to one embodiment of the present invention. FIGS. 2 and 3 are exploded views illustrating some components of the air compressor structure from different perspectives. For ease of description, Cartesian coordinates X, Y, and Z are provided. Referring simultaneously to FIGS. 1 to 3, in this embodiment, the air compressor structure 100 includes a cylinder 110, a piston 130, a cover 120, a transmission mechanism 140, a backflow prevention piece 180, a motor 150, an air reservoir 160, and a pressure gauge 170. The transmission mechanism 140 is connected between the bottom end of the piston 130 and the motor 150. The bottom end of the piston 130 is connected to the transmission mechanism 140, and the top end of the piston 130 is movably coupled within the cylinder 110. After receiving power, the motor 150 drives the piston 130 via the transmission mechanism 140 to reciprocate within the cylinder 110, thereby compressing the air within the cylinder 110. Alternatively, when the piston 130 is separated from the lid 120, air from the external environment can flow into the cylinder 110 to replenish it.

[0011] FIG. 4 is a partial cross-sectional view illustrating the structure of an air compressor from a three-dimensional perspective. Referring to FIGS. 2 to 4, in more detail, the cylinder 110 includes a cylindrical body 111, a plurality of protrusions 112 surrounding the cylindrical surface of the body 111, and a partition wall 115 separating the interior space of the cover 120 from the interior space of the cylinder 110. The partition wall 115 has a plurality of air holes 113, which are arranged annularly about the central axis CX of the body 111. As shown in FIG. 3, the inner wall of the cover 120 has a plurality of slots 122, and the cover 120 further includes a pressure post 121 located in the interior center and an air storage channel 123 corresponding to the interior space, so that the interior space of the cover 120 can be connected to the air reservoir 160 via the air storage channel 123. Therefore, by fitting the protrusion 112 and the slot 122 together, the lid body 120 is assembled to the main body 111 of the cylinder 110, and the internal space of the lid body 120 is adjacent to the internal space of the cylinder 110 via the partition wall 115, and the two internal spaces are connected by the air hole 113.

[0012] 1, the air reservoir 160 is provided with an air outlet 161 for connecting to an object to be inflated, such as a tire (not shown), and is provided with a pressure gauge 170 therein that can inform the user of the air pressure of the air reservoir 160. Simply put, when the piston 130 is driven to perform a reciprocating stroke within the cylinder 110, compressed air is continuously generated and transmitted from the interior space of the cylinder 110 through the interior space of the cover 120, the air storage channel 123, and the air reservoir 160, and then transmitted through the air outlet 161 to the object to be inflated, thereby filling the object with air.

[0013] 2 and 3 , the backflow prevention piece 180 of this embodiment is disposed between the cylinder 110 and the cover 120, and has a bowl-shaped profile such that the pressing post 121 of the cover 120 corresponds to the bowl inner bottom 184 of the backflow prevention piece 180. The backflow prevention piece 180 further has two annular ribs facing the cylinder 110 and sharing the same central axis CX, which are divided into an outer annular rib 182 and an inner annular rib 181, which respectively abut against the partition wall 115 of the cylinder 110, thereby reducing the contact area between the bowl-shaped profile and the partition wall 115. In short, the backflow prevention piece 180 of this embodiment has an upper surface (bowl inner bottom 184) and a bottom surface facing each other. The upper surface is flat so as to be pressed by the pressing post 121, and the annular ribs are located at the bottom and abut against the partition wall 115. Furthermore, the cylinder 110 further has a position limiting ring 114 extending from the partition wall 115 , and the bowl edge 183 of the bowl-shaped profile abuts against the inner annular wall of the position limiting ring 114 .

[0014] 5 and 6 are local cross-sectional views of the air compressor structure. Referring to FIGS. 5 and 6 simultaneously, in this embodiment, the backflow prevention piece 180 covers the air hole 113 of the partition wall 115, so that the backflow prevention piece 180 can move (along the Z axis) between the pressure post 121 and the partition wall 115 under the influence of the air flow. Details are as follows, where the air flow path is indicated by the wavy arrow.

[0015] 5, piston 130 performs a first stroke (forward stroke), that is, moves the upper end of piston 130 toward partition wall 115, compressing the air between piston 130 and partition wall 115 and transmitting the compressed air from the internal space of cylinder 110 to the internal space of cover 120 via air hole 113. At this time, the compressed air can push up backflow prevention piece 180, causing bowl inner bottom 184 of backflow prevention piece 180 to abut against pressure post 121, and bowl edge 183 is also driven by the compressed air to move away from the inner annular wall of position limit ring 114 (shown in FIG. 4), allowing the compressed air to smoothly flow into the internal space of cover 120.

[0016] As shown in FIG. 6, when the piston 130 performs its second stroke (return stroke), a vacuum is formed inside the cylinder 110 at the moment the upper end of the piston 130 separates from the air hole 113. At this time, the backflow prevention piece 180 is driven by the vacuum and the compressed air (located in the internal space of the cover 120) to move in the negative direction of the Z axis and abut against the partition wall 115, covering the air hole 113. The bowl edge 183 abuts against the inner annular wall of the position limit ring 114 (shown in FIG. 4). At the same time, the upper end of the piston 130, which separates from the partition wall 115, forms a gap G3 between the upper end of the piston 130 and the inner wall of the cylinder 110, allowing air from the external environment to flow into the cylinder 110 so that the air in the cylinder 110 can be compressed and flow in when the piston 130 next performs its first stroke.

[0017] As shown in FIG. 2, the air holes 113 in this embodiment are arranged annularly about the central axis CX. As shown in FIG. 5 or 6, the orthogonal projection of the air holes 113 on the backflow prevention piece 180 is located between two annular ribs (the outer annular rib 182 and the inner annular rib 181). This reduces the contact area between the bottom surface of the backflow prevention piece 180 and the partition wall 115 via the outer annular rib 182 and the inner annular rib 181, making it easier for the compressed air passing through the air holes 113 to smoothly push up the backflow prevention piece 180. Furthermore, when the piston 130 performs the second stroke, the backflow prevention piece 180 is pushed back by the compressed air inside the cover 120 due to the vacuum and the compressed air in the cover 120, and the outer annular rib 182 closes the gap between the air holes 113 and the interior space of the cover 120. At the same time, the bowl edge 183 again abuts against the inner annular wall of the position limiting ring 114, and together with the outer annular rib 182, provides the necessary backflow prevention function (preventing compressed air in the lid body 120 from flowing back into the cylinder 110).

[0018] 5 and 6, in the air compressor structure 100 of this embodiment, the piston 130 has an opening 131 and an intake blocking piece 190, which is elastically deformable and covers the opening 131 to open and close the opening 131. As shown in FIG. 6, when the piston 130 performs a second stroke, the intake blocking piece 190 creates a vacuum, allowing air from the external environment to push up the intake blocking piece 190 and enter the cylinder 110 through the opening 131. As shown in FIG. 5, when the piston 130 performs the first stroke, the intake blocking piece 190 returns to its original position to close the opening 131. Here, the intake blocking piece 190 is fixed to the top of the piston 130 via a fixing member 132b. The other side, which is not fixed, remains free so that the opening 131 can be smoothly opened and closed by the air flow. At the same time, the piston 130 further has a stopper 132a disposed on its upper part, which provides a stopper function for the opened intake blocking piece 190 when the piston 130 performs the second stroke, prevents the intake blocking piece 190 from being excessively deformed, and allows the intake blocking piece 190 to return smoothly when the piston 130 performs the first stroke.

[0019] FIG. 7A is a partial cross-sectional view of an air compressor structure according to another embodiment of the present invention. FIG. 7B is a partial cross-sectional view of an air compressor structure according to another embodiment of the present invention. Referring to FIGS. 7A and 7B, the piston 130 is in a different state from that shown in FIGS. 5 and 6. The backflow prevention piece 280 of this embodiment includes a position limiting ring 281, an inner annular rib 181, an outer annular rib 182, a bowl edge 183, and a recess 282. The inner annular rib 181, the outer annular rib 182, and the bowl edge 183 have been described in the previous embodiment, so further description will be omitted. The position limiting ring 281 extends and protrudes from the bowl inner bottom 184 and is correspondingly movably connected to the pressing post 121. When the backflow prevention piece 280 moves along the Z axis like the previously described backflow prevention piece 180, the pressing post 121 can maintain a connection with the position limiting ring 281, and the pressing post 121 provides the effect of limiting the position of the backflow prevention piece 280 in the XY plane.

[0020] FIG. 8 is a partial cross-sectional view of an air compressor structure according to another embodiment of the present invention. Referring to FIG. 8 and comparing it with FIG. 7A or 7B, in this embodiment, backflow prevention piece 380 includes position limiting ring 381, inner annular rib 382, outer annular rib 383, and bowl edge 384. Inner annular rib 382 also defines recess 385 on the outer bottom surface of the bowl. Position limiting ring 381, inner annular rib 382, outer annular rib 383, and bowl edge 384 perform the same functions as those of the previous embodiment (position limiting ring 281, inner annular rib 181, outer annular rib 182, and bowl edge 183). Furthermore, backflow prevention piece 380 has an increased structural thickness, width, and contour contour, thereby improving the structural strength of backflow prevention piece 380 and thereby enhancing its durability. Forming recess 385 is a means for reducing the contact area between backflow prevention piece 380 and partition wall 115 in accordance with the increase in the structural thickness and width, thereby allowing backflow prevention piece 380 to still smoothly drive compressed air. Also, compared to the backflow prevention piece 280 in which a step exists between bowl edge 183 and outer annular rib 182 to form recess 282 (as in backflow prevention piece 180), the annular rib (outer annular rib 383) of this embodiment is flush with bowl edge 384. The purpose of this is similarly to improve the structural strength of backflow prevention piece 380, provided that outer annular rib 383 can smoothly complete the function of the previous embodiment.

[0021] In summary, in the above embodiment of the present invention, the air compressor structure combines a movable backflow prevention piece with a pressure column of the cover body, so that the backflow prevention piece can open and close relative to the air hole under the influence of the air flow, allowing compressed air to pass when open and sealing the air hole when closed, thereby achieving the desired backflow prevention function.

[0022] More specifically, when the piston performs its first stroke (forward stroke), it compresses the air in the cylinder and delivers the compressed air to the cover through the air hole. At this time, the compressed air also drives the backflow prevention piece. An annular rib is arranged on the bottom surface of the backflow prevention piece, reducing the contact area between the backflow prevention piece and the partition wall. Therefore, the compressed air smoothly pushes up the backflow prevention piece and is delivered to the interior space of the cover. At this time, the backflow prevention piece moves upward and stops on the pressure column of the cover.

[0023] Conversely, when the piston performs its second stroke (return stroke), a vacuum is created inside the cylinder as it leaves the air hole. Because the compressed air is still present in the cover, the vacuum creates a pressure difference against the backflow prevention piece, driving it back to its position where it covers and seals the air hole. The backflow prevention piece abuts the cylinder's position limiting ring with its bowl edge and the partition wall with its annular rib, thereby retaining the compressed air in the cover and preventing it from flowing back into the cylinder. At the same time, the vacuum also allows air from the external environment to flow into the cylinder through the opening in the piston and the gap between the piston and the cylinder wall, preparing the piston for its next first stroke.

[0024] Therefore, the movable anti-reflux piece can move correspondingly by combining the movement of the piston and the resulting compressed air or vacuum, thereby achieving the desired compressed air passage or anti-reflux function. Compared with the prior art anti-reflux valves, the anti-reflux piece of the present invention significantly achieves the effect of simplifying the components, while at the same time overcoming the related problems faced by the prior art anti-reflux valves. [Industrial Applicability]

[0025] The air compressor structure of the present invention can be applied to air compressor equipment. [Explanation of symbols]

[0026] 100: Air compressor structure 110: Cylinder 111:Main body 112: Convex 113: Air vent 114: Position limit ring 115: Bulkhead 120: Lid 121: Pressurized column 122: Slot 123: Air storage channel 130: Piston 131:Aperture 132a:Stopper 132b: Fixing member 140: Transmission mechanism 150: Motor 160: Air reservoir 161: Air outlet 170: Pressure gauge 180, 280, 380: Backflow prevention piece 181, 382: Inner annular rib 182, 383: Outer annular rib 183, 384: Bowl Edge 184: Bowl bottom 190: Intake obstruction piece 281, 381: Position limit ring 282, 385: recesses CX: Central axis G3: Gap XYZ: Cartesian coordinates

Claims

1. a cylinder having a plurality of air holes; a piston reciprocably coupled within the cylinder; a lid body to be assembled to the cylinder, the lid body having a pressing post, and an internal space of the cylinder and an internal space of the lid body communicating with each other via the plurality of air holes; a backflow prevention piece movably disposed between the cylinder and the lid; Equipped with When the piston performs a first stroke, the piston approaches the plurality of air holes and compresses the air in the cylinder, and the compressed air passes through the plurality of air holes, pushes up the backflow prevention piece, and flows into the cover body; When the piston performs a second stroke, a vacuum is formed in the cylinder at the moment the piston leaves the plurality of air holes, and the backflow prevention piece is driven by the vacuum and the compressed air located in the cover body to cover and seal the plurality of air holes. Air compressor structure.

2. The backflow prevention piece has two annular ribs facing the cylinder and having the same central axis, and abuts against a partition wall of the cylinder, the partition wall having the plurality of air holes. The air compressor structure according to claim 1 .

3. The plurality of air holes are arranged in an annular arrangement, and orthogonal projections of the plurality of air holes on the backflow prevention piece are located between the two annular ribs.

3. The air compressor structure according to claim 2.

4. The backflow prevention piece has an upper surface and a bottom surface facing each other, the two annular ribs are located on the bottom surface, and the pressing post is adapted to abut on the upper surface.

3. The air compressor structure according to claim 2.

5. The backflow prevention piece has a bowl-shaped profile, the cylinder further has a partition wall and a position limiting ring extending from the partition wall, a bowl edge of the bowl-shaped profile abuts on an inner annular wall of the position limiting ring, the pressing post is adapted to abut on an inner bottom of the bowl-shaped profile, and the partition wall has the plurality of air holes. The air compressor structure according to claim 1 .

6. The backflow prevention piece has at least one annular rib located on an outer bottom of the bowl of the bowl-shaped profile, the annular rib being flush with the bowl edge.

6. The air compressor structure according to claim 5.

7. The backflow prevention piece has at least one annular rib located on the outer bottom of the bowl of the bowl-shaped contour, and there is a step between the annular rib and the bowl edge, forming a recess.

6. The air compressor structure according to claim 5.

8. The backflow prevention piece has a position limiting ring, which is movably connected to the pressing pole, and the pressing pole limits the position of the backflow prevention piece. The air compressor structure according to claim 1 .

9. The piston has an opening and an intake blocking piece, the intake blocking piece elastically deformably covers the opening to open and close the opening, when the piston performs the second stroke, the intake blocking piece is pushed up by the vacuum and enters the cylinder through the opening, and when the piston performs the first stroke, the intake blocking piece returns to its original position to close the opening. The air compressor structure according to claim 1 .

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