Scissor type oil-free air compressor
By adopting scissor-type structure and moving disc slanting mechanism in the oil-free air compressor, the problems of large friction and noise of the eccentric shaft in the prior art are solved, and efficient, smooth and clean air pumping is achieved.
Patent Information
- Application Number
- CN202411221766.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-02
- Publication Date
- 2025-02-11
AI Technical Summary
The existing oil-free air compressors have high rotational friction, easy wear and noise during operation, resulting in poor pumping air and low efficiency.
The oil-free air compressor adopts a scissor-type structure. By setting a moving disk and a slider in the chamber, the center of the moving disk is connected to the eccentric shaft through the bearing, and the eccentric shaft is used to drive the moving disk to periodically eccentric, and between the slider and the moving disk The included angle changes simulate the cross-move of scissors to achieve periodic compression and release of air.
It reduces the rotational friction of the eccentric shaft, reduces wear, and has a smoother rotation. It is noise-free when pumping air, and is smooth and fast, ensuring clean and efficient pumping of the air.
Smart Images
Figure CN119412316A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of compressors, and in particular relates to a scissor-type oil-free air compressor. Background Art
[0002] Oil-free air compressors are used to pump air and can keep the pumped air free of oil residue, ensuring a continuous supply of clean, oil-free compressed air. They are used in applications with extremely high oil-free requirements or on electromechanical equipment.
[0003] The current oil-free air compressor structure has design defects. The rotational friction of the eccentric shaft is very large, the eccentric shaft is easily worn and produces noise, the eccentric shaft will shake, the pumped air is not smooth, and the efficiency of pumping air is reduced. Summary of the invention
[0004] The technical problem to be solved by the present invention is to overcome the defects of the prior art and solve the problem that the existing oil-free air compressor runs unsteadily and has low air pumping efficiency.
[0005] The technical solution adopted by the present invention to solve its technical problem is: a scissor-type oil-free air compressor, comprising a chamber: a moving plate is arranged inside the chamber, a slider and a bearing cover are movably connected between any end of the outer wall of the moving plate and any end of the inner wall of the chamber, and the center of the moving plate is connected to an eccentric shaft through a bearing.
[0006] In a preferred technical solution of the present invention, an upper cover and a bottom cover are respectively provided at the upper and lower ends of the chamber, at least three upper and lower cover positioning pins passing through the periphery of the chamber are interspersed between the upper cover and the bottom cover, the eccentric shaft is rotatably connected to the center of a circle between the upper cover and the bottom cover through a bearing, the lower end of the eccentric shaft passes downward through the lower end of the bottom cover, and a threaded connection portion is provided at the lower end of the eccentric shaft.
[0007] In a preferred technical solution of the present invention, a rotating locating pin is connected between the slider and the chamber via a bearing, a pair of bearing covers are provided and are symmetrically distributed up and down, the bearing covers are movably connected to the surface of the slider, a pair of yaw screws symmetrically distributed up and down are threadedly connected between the bearing cover and the moving plate, and at least two through holes are opened on the surface of the moving plate.
[0008] In a preferred technical solution of the present invention, a pair of yaw positioning pins are interspersed between the upper and lower bearing covers, and the yaw screw is located between the two yaw positioning pins.
[0009] In a preferred technical solution of the present invention, a second air inlet and outlet communicating with the interior of the chamber is opened on any side of the upper cover surface, and a first air inlet and outlet communicating with the interior of the chamber is opened on any side of the bottom cover surface.
[0010] In a preferred technical solution of the present invention, a plurality of first fastening screws are threadedly connected between the upper cover and the chamber, and a plurality of second fastening screws are threadedly connected between the bottom cover and the chamber.
[0011] Compared with the prior art, the present invention has the following beneficial effects:
[0012] Air is input into the chamber through the first air inlet and outlet, contacts the surface of the moving disk and flows into the through hole. The threaded connection part connects the eccentric shaft to the rotor at the power output end of the motor for providing a rotational driving force. The motor drives the eccentric shaft to rotate along the central axis between the upper cover and the bottom cover, and relies on the eccentric shaft to drive the moving disk to perform a periodic pendulum movement inside the chamber. The head and tail ends of the slider use the bearing cover and the rotating locating pin as rotation fulcrums respectively and swing with the rotation and pendulum of the moving disk. The change in the angle between the slider and the moving disk presents a change effect similar to the cross-reciprocating motion of scissors. The air contacts the surrounding of the moving moving disk inside the chamber, and the moving disk periodically squeezes and relaxes the air inside the chamber. The position between the inner wall of the air chamber and the surrounding of the moving moving disk is periodically compressed and released. The through hole contacts the air inside the chamber as the moving disk rotates and pendulums. The air When the passive disk is compressed, it will flow into the through hole, and when the air is released from the passive disk inside the chamber, it will be sucked out from the through hole. Half of the dynamic disk will be under positive pressure and the other half will be under negative pressure. The air will produce negative pressure and positive pressure inside the chamber, alternating in a periodic sinusoidal function, so that the air is pushed by the passive disk inside the chamber and performs periodic peristalsis. A pressure difference is generated between the head and tail ends inside the chamber. After the dynamic disk compresses the air, it discharges high-pressure air from the second air inlet and outlet, thereby causing the air to flow continuously and directional inside the compressor. The rotational friction of the eccentric shaft is very small, reducing wear, and the eccentric shaft rotates more smoothly. There is no noise when pumping air, and the process of pumping air is smoother and faster. This air compressor that uses a dynamic disk to pump air does not need to use lubricating oil to lubricate the eccentric shaft, avoiding oil contamination of the air inside the chamber. The pumped air is oil-free and clean, and has the effect of high-efficiency air pumping. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a top view of the overall structure of the present invention;
[0014] Figure 2 It is a bottom view of the overall structure of the present invention;
[0015] Figure 3 This is a bottom view of the external assembly of the chamber and the moving disk of the present invention;
[0016] Figure 4 This is a top view of the external assembly of the chamber and the moving disk of the present invention;
[0017] Figure 5 It is a schematic diagram of the external structure of the eccentric shaft of the present invention;
[0018] Figure 6 This is a schematic diagram of the external structure of the slider of the present invention;
[0019] Figure 7 It is the assembly effect diagram of the eccentric shaft of the present invention.
[0020] In the figure: 1. chamber; 2. upper cover; 3. bottom cover; 4. first air inlet and outlet; 5. eccentric shaft; 6. threaded connection; 7. second air inlet and outlet; 8. moving plate; 9. through hole; 10. upper and lower cover locating pins; 11. slider; 12. bearing cover; 13. yaw locating pin; 14. yaw screw; 15. rotation locating pin; 15. first fastening screw; 16. second fastening screw. DETAILED DESCRIPTION
[0021] For example, see Figure 1-7 The present invention provides a technical solution: a scissor-type oil-free air compressor, comprising a chamber 1: an upper cover 2 and a bottom cover 3 are respectively arranged at the upper and lower ends of the chamber 1, a moving plate 8 is arranged inside the chamber 1, and at least two through holes 9 are opened on the surface of the moving plate 8, and a slider 11 and a bearing cover 12 are movably connected between any end of the outer wall of the moving plate 8 and any end of the inner wall of the chamber 1, and a pair of bearing covers 12 are arranged and symmetrically distributed up and down, and the bearing covers 12 are movably connected to the surface of the slider 11, and the center of the moving plate 8 is connected to an eccentric shaft 5 through a bearing, and at least three upper and lower cover locating pins 10 that pass through the periphery of the chamber 1 are interspersed between the upper cover 2 and the bottom cover 3, and a precise positioning structure is provided for the upper cover 2 and the lower cover when they are assembled at the upper and lower ends of the chamber 1 through at least three upper and lower cover locating pins 10, and when the upper cover 2 and the bottom cover 3 touch the upper and lower cover locating pins 10, it means that the upper and lower ends of the chamber 1 are assembled in place, and the upper cover 2 and the bottom cover 3 are respectively far away A gap of about two millimeters is left at the upper and lower ends of the moving disk 8 to prevent the upper and lower ends of the moving disk 8 from hitting the upper cover 2 and the bottom cover 3. The upper cover 2 and the bottom cover 3 respectively seal and block the upper and lower ends of the chamber 1. A plurality of first fastening screws 15 are threadedly connected between the upper cover 2 and the chamber 1, and a plurality of second fastening screws 16 are threadedly connected between the bottom cover 3 and the chamber 1. The first fastening screw 15 fastens the lower end of the upper cover 2 to the upper end of the chamber 1, and the second fastening screw 16 fastens the upper end of the bottom cover 3 to the lower end of the chamber 1, so that the moving disk 8 is sealed inside the chamber 1. The eccentric shaft 5 is rotatably connected to the center of the circle between the upper cover 2 and the bottom cover 3 through a bearing, and the lower end of the eccentric shaft 5 downwardly penetrates the lower end of the bottom cover 3. A threaded connection portion 6 is provided at the lower end of the eccentric shaft 5, and the threaded connection portion 6 connects the eccentric shaft 5 to the rotor at the power output end of the motor for providing a rotational driving force. The motor drives the eccentric shaft 5 to rotate along the axis of the center of the circle between the upper cover 2 and the bottom cover 3.
[0022] Embodiment 2, further supplemented based on the above embodiment: since there are two kinds of axes in the upper and lower sections of the eccentric shaft 5, the two axes are not on the same axis, and there is a distance called eccentricity between the two axes, the upper and lower sections of the eccentric shaft 5 are not on the same vertical axis, but the centers of the upper and lower ends of the eccentric shaft 5 are on the same vertical axis with the lower section of the eccentric shaft 5, the lower section of the eccentric shaft 5 rotates along the center of the bottom cover 3, and the upper end of the eccentric shaft 5 rotates along the center of the top cover, and the upper section of the eccentric shaft 5 will rotate eccentrically and drive the moving disk 8 to oscillate inside the chamber 1, and the eccentric shaft 5 is used to drive the moving disk 8 to present a periodic oscillation movement inside the chamber 1.
[0023] Embodiment 3, further supplemented according to the above embodiment: a pair of yaw screws 14 symmetrically distributed up and down are threadedly connected between the bearing cover 12 and the movable plate 8, a pair of yaw positioning pins 13 are interspersed between the upper and lower bearing covers 12, the yaw screw 14 is located between the two yaw positioning pins 13, the yaw positioning pins 13 and the yaw screw 14 are used to stack the two bearing covers 12 up and down and assemble them on any side around the movable plate 8, the bearing cover 12 is similar to a gourd shape or an Arabic numeral "8" shape, the head end of the slider 11 is complementary to the shape of the bearing cover 12, and the upper and lower sides of the head end of the slider 11 are provided with inward "recessed gaps" to wrap the upper and lower corresponding bearing covers 12, and half of the volume of the bearing cover 12 extends into the "recessed gap", and when the movable plate 8 is deflected, it will drag the bearing cover 12 inward. The slider 11 moves in the chamber 1, and the tail end of the slider 11 relies on the rotating locating pin 15 to keep connected with the inner wall of the chamber 1. The tail end of the slider 11 rotates back and forth alternately around the outer periphery of the rotating locating pin 15 with the rotating locating pin 15 as the rotating fulcrum. The slider 11 will swing with the movement of the bearing cover 12, and the slider 11 and the bearing cover 12 rotate back and forth alternately in the clockwise and counterclockwise direction. The bearing cover 12 drags the slider 11 to move inside the chamber 1. The slider 11 and the chamber 1 are connected with the rotating locating pin 15 through a bearing. The head and tail ends of the slider 11 respectively use the bearing cover 12 and the rotating locating pin 15 as the rotating fulcrum to swing with the rotation and deflection of the moving disk 8. The slider 11 periodically approaches and moves away from the moving disk 8, and the change in the angle between the slider 11 and the moving disk 8 presents a change effect similar to the cross-reciprocating motion of scissors, forming a scissors-type air oil-free compressor structure.
[0024] Embodiment 4, further supplemented according to the above embodiment: a second air inlet and outlet 7 communicating with the interior of the chamber 1 is provided on any side of the surface of the upper cover 2, and air is input into the interior of the chamber 1 through the first air inlet and outlet 4, and the air contacts the surface of the moving disk 8 and approaches the through hole 9 along the gap between the lower end of the upper cover 2 and the upper end of the moving disk 8 and the gap between the upper end of the bottom cover 3 and the lower end of the moving disk 8, respectively. At the same time, the air contacts the surrounding of the moving moving disk 8 inside the chamber 1, and the moving disk 8 periodically squeezes and relaxes the air inside the chamber 1, and the position between the inner wall of the air chamber 1 and the surrounding of the moving moving disk 8 is periodically compressed and released, and the through hole 9 contacts the air inside the chamber 1 as the moving disk 8 rotates and deflects. The air is moved by the moving disk 8 inside the chamber 1. When compressed, it will flow into the through hole 9, and when the passive disk 8 inside the chamber 1 releases the air, it will be sucked out from the through hole 9. The through hole 9 forms a buffer space for the air flowing inside the chamber 1 to increase the space for accommodating air inside the chamber 1. Half of the pressure around the moving disk 8 is positive and the other half is negative. The air generates negative pressure and positive pressure inside the chamber 1, which change alternately in a periodic sinusoidal function, so that the air is pushed by the passive disk 8 inside the chamber 1 and performs periodic peristalsis, and a pressure difference is generated between the head and tail ends of the chamber 1. A first air inlet and outlet 4 that passes through the interior of the chamber 1 is provided on either side of the surface of the bottom cover 3. The moving disk 8 compresses the air and discharges high-pressure air from the second air inlet and outlet 7, thereby causing the air to flow continuously and directionally inside the compressor.
[0025] Embodiment 5 is summarized based on the above embodiments: since the moving disk 8 presents periodic deflection to compress and release the air, each side around the moving disk 8 contacts each side of the inner wall of the chamber 1 in turn. In addition, the remaining positions around the moving disk 8 and the inner wall of the chamber 1 will maintain a distance. There is only one straight line in the contact part between the moving disk 8 and the chamber 1, and it mainly relies on the eccentric centrifugal force generated by the moving disk 8 on the chamber 1 when the moving disk 8 deflects to continue to move inside the chamber 1. The moving disk 8 relies on the eccentric centrifugal force to bear most of the force borne by the eccentric shaft 5. In addition, the eccentric shaft 5 is connected by a bearing to separate the contact with the upper cover 2 and the bottom cover 3. The eccentric shaft 5 is very labor-saving when rotating. Therefore, the rotational friction of the eccentric shaft 5 is very small, which reduces wear. The eccentric shaft 5 rotates more smoothly, there is no noise when pumping air, and the process of pumping air is smoother and faster. This air compressor that uses a moving disk 8 to pump air does not need to use lubricating oil to lubricate the eccentric shaft 5, so as to avoid the air inside the chamber 1 being contaminated by oil. The pumped air is oil-free and clean, and has the effect of high-efficiency air pumping.
Claims
1. A scissor-type oil-free air compressor, comprising a chamber (1), characterized in that: A moving disk (8) is arranged inside the chamber (1), a slider (11) and a bearing cover (12) are movably connected between any end of the outer wall of the moving disk (8) and any end of the inner wall of the chamber (1), and the center of the moving disk (8) is connected to an eccentric shaft (5) via a bearing.
2. A scissor-type oil-free air compressor according to claim 1, characterized in that: The chamber (1) is provided with an upper cover (2) and a bottom cover (3) at the upper and lower ends respectively; at least three upper and lower cover positioning pins (10) are interspersed between the upper cover (2) and the bottom cover (3) and pass through the periphery of the chamber (1); the eccentric shaft (5) is rotatably connected to the center of a circle between the upper cover (2) and the bottom cover (3) through a bearing; the lower end of the eccentric shaft (5) passes downward through the lower end of the bottom cover (3); and a threaded connection portion (6) is provided at the lower end of the eccentric shaft (5).
3. A scissor-type oil-free air compressor according to claim 1, characterized in that: A rotating positioning pin (15) is connected between the slider (11) and the chamber (1) via a bearing, a pair of bearing covers (12) are provided and are symmetrically distributed in the upper and lower parts, the bearing covers (12) are movably connected to the surface of the slider (11), a pair of sway screws (14) are threadedly connected between the bearing cover (12) and the moving plate (8) and are symmetrically distributed in the upper and lower parts, and at least two through holes (9) are opened on the surface of the moving plate (8).
4. A scissor-type oil-free air compressor according to claim 3, characterized in that: A pair of yaw positioning pins (13) are interspersed between the upper and lower bearing covers (12), and the yaw screw (14) is located between the two yaw positioning pins (13).
5. A scissor-type oil-free air compressor according to claim 2, characterized in that: A second air inlet and outlet (7) communicating with the interior of the chamber (1) is provided on any side of the surface of the upper cover (2), and a first air inlet and outlet (4) communicating with the interior of the chamber (1) is provided on any side of the surface of the bottom cover (3).
6. A scissor-type oil-free air compressor according to claim 2, characterized in that: A plurality of first fastening screws (15) are threadedly connected between the upper cover (2) and the chamber (1), and a plurality of second fastening screws (16) are threadedly connected between the bottom cover (3) and the chamber (1).