Scissor type oil-free air compressor
Through the periodic slant and cross-moving of the eccentric shaft with the eccentric shaft with the periodic slant and the slider, the problems of wear and noise of the eccentric shaft in the oil-free air compressor are solved, and efficient, oil-free and clean air pumping effect is achieved.
Patent Information
- Application Number
- CN202422148447.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-02
- Publication Date
- 2025-08-05
- Estimated Expiration
- 2034-09-02
AI Technical Summary
The existing oil-free air compressors have high rotational friction force of the eccentric shaft, which makes the eccentric shaft easy to wear, generate noise, and are not smooth in pumping air and are inefficient.
The oil-free air compressor adopts a scissor-type structure, which uses the periodic swing of the moving disc and the eccentric shaft and the cross-move of the slider to achieve periodic compression and release of air through the through holes, reduces the friction of the eccentric shaft and avoids the use of lubricating oil.
The eccentric shaft is achieved smoothly rotating, the pumped air is noise-free, smooth and fast, the output air is oil-free and clean, and has high efficiency.
Smart Images
Figure CN223190576U_ABST
Abstract
Description
Technical Field
[0001] The utility model 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 utility model is to overcome the defects of the prior art and solve the problem that the existing oil-free air compressors run unsteadily and thus have low air pumping efficiency.
[0005] The technical solution adopted by the utility model to solve the technical problem is: a scissor-type oil-free air compressor, comprising a chamber: a movable disc is provided inside the chamber, a slider and a bearing cover are movably connected between any end of the outer wall of the movable disc and any end of the inner wall of the chamber, and the center of the movable disc is connected to an eccentric shaft through a bearing;
[0006] A rotating positioning pin is connected between the slider and the chamber through 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 are threadedly connected between the bearing cover and the movable plate and are symmetrically distributed up and down, and at least two through holes are opened on the surface of the movable plate.
[0007] In a better 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, and 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 the circle between the upper cover and the bottom cover through a bearing, and 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.
[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 power output rotor of the motor for providing 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 periodic oscillation in the chamber. The head and tail ends of the slider use the bearing cover and the rotating positioning pin as the rotation fulcrum respectively and swing with the rotation and oscillation 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 in the chamber, and the moving disk periodically squeezes and relaxes the air in 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 in the chamber as the moving disk rotates and oscillates. The air in the chamber When the passive disk is compressed, it will flow into the through-hole, and when the air is released by the passive disk inside the chamber, it will be sucked out from the through-hole. Half of the pressure around the dynamic disk will be positive and the other half will be negative. The air will produce negative and positive pressure inside the chamber, alternating in a periodic sinusoidal function, causing the air to be pushed by the passive disk inside the chamber and perform periodic peristalsis. A pressure difference is generated between the head and tail ends inside the chamber. After compressing the air, the dynamic disk discharges high-pressure air from the second air inlet and outlet, thereby causing the air to flow continuously and directionally 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, with the effect of high-efficiency air pumping. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 This is a top view of the overall structure of the utility model;
[0014] Figure 2 This is a bottom view of the overall structure of the utility model;
[0015] Figure 3 This is a bottom-up rendering of the external assembly of the chamber and the moving disk of the utility model;
[0016] Figure 4 This is a top view of the external assembly of the chamber and the moving disk of the utility model;
[0017] Figure 5This is a schematic diagram of the external structure of the eccentric shaft of the utility model;
[0018] Figure 6 This is a schematic diagram of the external structure of the slider of the utility model;
[0019] Figure 7 This is an assembly effect diagram of the eccentric shaft of the utility model.
[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. Deflection locating pin; 14. Deflection screw; 15. Rotation locating pin; 151. First fastening screw; 16. Second fastening screw. DETAILED DESCRIPTION
[0021] For example 1, please refer to Figure 1-7 The utility model 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 provided at the upper and lower ends of the chamber 1, a moving disc 8 is provided inside the chamber 1, and at least two through holes 9 are opened on the surface of the moving disc 8, and a slider 11 and a bearing cover 12 are movably connected between any end of the outer wall of the moving disc 8 and any end of the inner wall of the chamber 1, and a pair of bearing covers 12 are provided 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 disc 8 is connected to the 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. The at least three upper and lower cover locating pins 10 are used to provide a precise positioning structure for the upper cover 2 and the lower cover when they are assembled at the upper and lower ends of the chamber 1. 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 There is a gap of about two millimeters from 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 151 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 151 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. The lower end of the eccentric shaft 5 downwardly penetrates the lower end of the bottom cover 3. A threaded connection part 6 is provided at the lower end of the eccentric shaft 5. The threaded connection part 6 connects the eccentric shaft 5 to the power output rotor of the motor for providing rotational driving force. The motor drives the eccentric shaft 5 to rotate along the center axis between the upper cover 2 and the bottom cover 3.
[0022] Embodiment 2, further supplemented based on the above embodiment: Since there are two 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 as 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. The upper section of the eccentric shaft 5 will rotate eccentrically and drive the movable disk 8 to oscillate inside the chamber 1. The eccentric shaft 5 is used to drive the movable disk 8 to exhibit periodic oscillation inside the chamber 1.
[0023] Embodiment 3, further supplemented according to the above embodiment: a pair of yaw screws 14 symmetrically distributed in the upper and lower directions 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, and 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 the shape of a gourd or the Arabic numeral "8". The shape of the head end of the slider 11 is complementary to that of the bearing cover 12. 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. Half of the volume of the bearing cover 12 extends into the "recessed gap". When the movable plate 8 deflects, it will drag the bearing cover 12 inward. The slider 11 is connected to the inner wall of the chamber 1 by the rotating locating pin 15, and 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 for the clockwise and counterclockwise directions. The bearing cover 12 drags the slider 11 to move inside the chamber 1. The slider 11 and the chamber 1 are connected by a rotating locating pin 15 through a bearing. The head and tail ends of the slider 11 use the bearing cover 12 and the rotating locating pin 15 as the rotating fulcrums respectively and swing with the rotation and deflection of the movable disk 8. The slider 11 periodically approaches and moves away from the movable disk 8, and the change in the angle between the slider 11 and the movable disk 8 presents a change effect similar to the cross-reciprocating motion of scissors, forming a scissor-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. 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. 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 dynamic 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. 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 dynamic 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] Example 5, summarized based on the above examples: 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 rest of the positions around the moving disk 8 and the inner wall of the chamber 1 will maintain a distance. There is only a 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, reducing wear, and 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, avoiding the air inside the chamber 1 from being contaminated by oil. The pumped air is oil-free and clean, with 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 provided 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; 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 directions, the bearing covers (12) are movably connected to the surface of the slider (11), a pair of deflection screws (14) are symmetrically distributed in the upper and lower directions are threadedly connected between the bearing cover (12) and the movable plate (8), and at least two through holes (9) are opened on the surface of the movable plate (8).
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) passing through the periphery of the chamber (1) are interspersed between the upper cover (2) and the bottom cover (3). 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. The lower end of the eccentric shaft (5) passes through the lower end of the bottom cover (3) downwardly. The lower end of the eccentric shaft (5) is provided with a threaded connection portion (6).
3. The scissor-type oil-free air compressor according to claim 1, 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).
4. 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).
5. The scissor-type oil-free air compressor according to claim 2, characterized in that: A plurality of first fastening screws (151) 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).