Oil-free vacuum machine

Abstract

The utility model provides an oil-free vacuum machine which comprises a cam main shaft, a first bearing sleeved on the cam main shaft, a double-eccentric cam sleeved on the first bearing, a second bearing sleeved on the double-eccentric cam, a guide sliding block and a driving assembly for driving the cam main shaft to rotate, a cylinder assembly and a piston assembly which are arranged in a rotary connection mode and horizontally opposite to each other are arranged on the connecting rod, the cylinder assembly is provided with an air inlet used for pumping high-pressure air into the cylinder assembly and an air outlet used for discharging the high-pressure air, and when the cam main shaft rotates, a first bearing arranged on the cam main shaft in a sleeving mode drives the double-eccentric cam. The double-eccentric cam drives the second bearing to do corresponding circular motion in the guide sliding block, the connecting rod drives the piston assembly to do reciprocating rectilinear motion on the same plane and the same center line on the air cylinder assembly, and when the piston assembly does reciprocating rectilinear motion, air is pumped through the air inlet and exhausted through the air outlet, so that a reciprocating cycle is completed.

Description

Technical Field

[0001] The utility model relates to an oil-free vacuum machine. Background Art

[0002] In the prior art, vacuum machines are widely used equipment. Vacuum machines are closely related to all areas of modern industry and life, and are general-purpose mechanical equipment that plays an important role. Vacuum machines can be used in semiconductors, chemical processes, machinery manufacturing, electricity, medical treatment, food processing, and almost every place where compressed gas is needed. At present, the commonly used vacuum machines are mainly screw vacuum machines and oil-free reciprocating vacuum machines. Although these two vacuum machines have their own advantages, they also have certain shortcomings. For example, a screw vacuum pump is an exhaust device that uses a pair of screws to rotate synchronously and at high speed in the pump housing to produce suction and exhaust effects, but the rotor will still be damaged after long-term use; an oil-free reciprocating vacuum pump is a vacuum pump that mainly relies on the reciprocating motion of the piston to periodically change the working volume of the pump chamber (cylinder) to exhaust air, but it is noisy and has poor stability and large vibrations, and requires not only high wear resistance of the material.

[0003] Therefore, further improvement is needed. Utility Model Content

[0004] Based on this, the purpose of the utility model is to provide an oil-free vacuum machine to overcome the shortcomings of the prior art. It is easy to operate, reliable in operation, energy-saving and efficient, highly wear-resistant, and easy to manufacture, saving materials and costs.

[0005] An oil-free vacuum machine designed for this purpose comprises a cam main shaft, a first bearing sleeved on the cam main shaft, a double eccentric cam sleeved on the first bearing, a second bearing sleeved on the double eccentric cam and a guide slider, and a driving assembly for driving the cam main shaft to rotate, the guide slider is provided with a connecting rod, the connecting rod is provided with a cylinder assembly and a piston assembly which are screwed and horizontally opposed, the cylinder assembly has an air inlet for drawing high-pressure gas into the cylinder assembly and an air outlet for discharging the high-pressure gas, when the cam main shaft rotates, the first bearing sleeved on the cam main shaft drives the double eccentric cam, the double eccentric cam drives the second bearing to make corresponding circular motion in the guide slider, the connecting rod drives the piston assembly to make reciprocating linear motion on the same plane and center line of the cylinder assembly, when the piston assembly makes reciprocating linear motion, the air is drawn through the air inlet and exhausted from the air outlet to complete a reciprocating cycle.

[0006] The cam main shaft comprises a connecting end and a transmission end, the central axis of the transmission end coincides with the central axis of the cam main shaft, and the central axis of the connecting end is eccentrically arranged with the central axis of the cam main shaft; the driving assembly is transmission-connected to the transmission end.

[0007] There are multiple first bearings, and the multiple first bearings are spaced and sleeved on the connecting end, and a gasket is arranged between each of the first bearings; the double eccentric cam includes a connecting hole that matches the outer diameter of the first bearing in a circumferential direction.

[0008] The double eccentric cam comprises an eccentric wheel periphery, and the inner diameter of the second bearing is sleeved on the eccentric wheel periphery; an inner cavity is arranged on the guide slider, and the outer diameter of the second bearing is circumferentially matched and connected with the inner cavity.

[0009] There is more than one guide sliding block, and the more than one guide sliding block is relatively arranged on the cam main shaft; and a plurality of through holes are arranged on the double eccentric cam.

[0010] The oil-free vacuum machine also includes a pump housing, the drive assembly and the cylinder assembly are mounted on the outside of the pump housing, a plurality of mounting openings are provided on the pump housing, the cylinder assembly and the piston assembly form a compression structure, the compression structure is provided with a plurality of groups, and the plurality of groups of compression structures are respectively installed and arranged corresponding to the mounting openings; a third bearing and a rear end cover are provided on the pump housing, the third bearing is fixedly mounted on the top of the pump housing through the rear end cover, and the rear end cover is fixedly connected to the pump housing by screws.

[0011] The cylinder assembly includes a cylinder body, a cylinder sleeve and a valve cover, the cylinder sleeve is installed on the cylinder body, the piston assembly reciprocates in the cylinder sleeve through the connecting rod, the valve cover is arranged on one end of the cylinder body, the inner cavity of the valve cover is divided into a positive pressure chamber and a negative pressure chamber, the air inlet is located on the positive pressure chamber, the air outlet is located on the negative pressure chamber, a conducting pipe is provided between each of the compression structures, the air inlet on each of the compression structures is connected through the conducting pipe, the conducting pipe is connected to a vacuum container box, and the gas in the vacuum container box is supplied to the positive pressure chamber through the conducting pipe.

[0012] A ventilation assembly is provided between the cylinder liner and the valve cover, and the ventilation assembly includes a first ventilation valve plate and a second ventilation valve plate. The first ventilation valve plate cooperates with the cylinder liner, and the second ventilation valve plate cooperates with the valve cover. A first ventilation hole is provided on the first ventilation valve plate, and a second ventilation hole is provided on the second ventilation valve plate. When the first ventilation valve plate cooperates with the second ventilation valve plate, the first ventilation hole and the second ventilation hole are staggered.

[0013] The piston assembly is provided with multiple ones, and the piston assemblies are symmetrically arranged on both ends of the connecting rod and serve as positioning guides in the cylinder assembly. The piston assembly includes a piston ring, a leather cup and a leather cup pressure cover. The piston ring is arranged on the circumference of the end of the connecting rod, and the leather cup and the leather cup pressure cover are arranged on the end of the connecting rod.

[0014] A cam balance block is arranged on the connecting end.

[0015] An oil-free vacuum machine in the above embodiment includes a cam main shaft, a first bearing mounted on the cam main shaft, a double eccentric cam mounted on the first bearing, a second bearing and a guide slider mounted on the double eccentric cam, and a driving assembly for driving the cam main shaft to rotate. The guide slider is provided with a connecting rod, and the connecting rod is provided with a cylinder assembly and a piston assembly that are screwed and horizontally opposed. The cylinder assembly has an air inlet for drawing high-pressure gas into the cylinder assembly and an air outlet for discharging the high-pressure gas. When the cam main shaft rotates, the first bearing mounted on the cam main shaft drives the double eccentric cam, and the double eccentric cam drives the second bearing to perform corresponding circular motion in the guide slider. The connecting rod drives the piston assembly to perform reciprocating linear motion on the same plane and the same center line on the cylinder assembly. When the piston assembly performs reciprocating linear motion, air is drawn through the air inlet and exhausted from the air outlet to complete a reciprocating cycle. Specifically, the cam main shaft cooperates with the double eccentric cam, which helps to balance the load and reduce mechanical vibration; the first eccentric cam located on the front side is assembled in a group with one of the guide sliders and realizes a transmission connection, and the second eccentric cam located on the rear side is assembled in a group with another guide slider and realizes a transmission connection, and the guide slider is transmission-connected to the piston assembly through its connecting rod; the driving assembly drives the cam main shaft to perform circular motion, and the cam main shaft drives the guide slider to move back and forth along its length direction through the double eccentric cam, and the guide slider drives the piston assembly to perform piston motion in the cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and the description thereof are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 It is a schematic diagram of the overall structure of an oil-free vacuum machine in one embodiment of the utility model.

[0019] Figure 2 This is a schematic diagram of the overall structure of the oil-free vacuum machine in another direction in one embodiment of the utility model.

[0020] Figure 3 It is a top view of the overall structure of an oil-free vacuum machine in one embodiment of the utility model.

[0021] Figure 4 This is a cross-sectional view of the overall structure of an oil-free vacuum machine in one embodiment of the utility model.

[0022] Figure 5 It is a schematic structural diagram of a cylinder assembly and a piston assembly in one embodiment of the utility model.

[0023] Figure 6 It is a schematic structural diagram of a cylinder assembly, a gas exchange assembly and a piston assembly in one embodiment of the utility model.

[0024] Figure 7 It is a schematic diagram of the exploded structure of the cylinder assembly, the gas exchange assembly and the piston assembly in one embodiment of the utility model.

[0025] Figure 8 It is a cross-sectional view of the assembly structure of the cam main shaft and the driving assembly in one embodiment of the utility model.

[0026] Fig. 9 This is a cross-sectional view of the assembly structure of the cam main shaft and the driving assembly in another direction in one embodiment of the utility model.

[0027] Fig.10 This is an exploded view of the overall structure of an oil-free vacuum machine in one embodiment of the utility model.

[0028] Fig.11 It is a schematic diagram of the assembly structure of the cam main shaft, double eccentric cam, guide slider, connecting rod, piston assembly and cylinder in one embodiment of the utility model.

[0029] Fig.12 It is a cross-sectional view of the assembly structure of the cam main shaft, double eccentric cam, guide slider, connecting rod, piston assembly and cylinder assembly in another direction in one embodiment of the utility model.

[0030] Fig.13 It is a schematic diagram of the assembly structure of the cam spindle, guide slider, connecting rod, piston assembly and cylinder assembly in one embodiment of the utility model.

[0031] Fig.14 It is a cross-sectional view of a double eccentric cam structure in one embodiment of the utility model.

[0032] Fig.15 This is a cross-sectional view of the cam spindle structure in one embodiment of the utility model.

[0033] Fig.16 This is a cross-sectional view of the guide slider and connecting rod structure in one embodiment of the utility model. DETAILED DESCRIPTION

[0034] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0035] like Figure 1-Figure 10 As shown, an oil-free vacuum machine is provided, comprising a cam main shaft 1, a first bearing 2 sleeved on the cam main shaft 1, a double eccentric cam 3 sleeved on the first bearing 2, a second bearing 4 sleeved on the double eccentric cam 3 and a guide slider 5, and a driving assembly 8 for driving the cam main shaft 1 to rotate, a connecting rod 6 is provided on the guide slider 5, a cylinder assembly 701 and a piston assembly 702 are provided on the connecting rod 6, and the cylinder assembly 701 has an air inlet 70131 for extracting high-pressure gas into the cylinder assembly 701. a and an outlet 70132b for discharging high-pressure gas. When the cam main shaft 1 rotates, the first bearing 2 mounted on the cam main shaft 1 drives the double eccentric cam 3. The double eccentric cam 3 drives the second bearing 4 to make corresponding circular motion in the guide slider 5. The connecting rod 6 drives the piston assembly 702 to make reciprocating linear motion on the same plane and center line of the cylinder assembly 701. When the piston assembly 702 makes reciprocating linear motion, air is drawn in through the air inlet 70131a and exhausted from the air outlet 70132b to complete a reciprocating cycle.

[0036] Specifically, the driving assembly 8 drives the cam main shaft 1 to rotate through the transmission end, and the cam main shaft 1 cooperates with the double eccentric cam 3 to help balance the load and reduce mechanical vibration; the first eccentric cam 3 located on the front side is assembled with one of the guide sliders 5 in a group and realizes transmission connection, and the second eccentric cam 3 located on the rear side is assembled with another guide slider 5 in a group and realizes transmission connection, and the guide slider 5 is transmission connected with the piston assembly 702 through its connecting rod 6; the driving assembly 8 drives the cam main shaft 1 to make a circular motion, and the cam main shaft 1 drives the guide slider 5 to move back and forth along its length direction through the double eccentric cam 3, and the guide slider 5 drives the piston assembly 702 in the cylinder assembly 701 The connecting rod 6 drives the piston assembly 702 to move forward, and air is sucked out through the air inlet 70131a. The volume of the cylinder assembly 701 increases, forming a negative pressure. When the connecting rod 6 drives the piston assembly 702 to move backward, the volume of the cylinder assembly 701 decreases, and the gas is compressed. The compressed gas is discharged through the air outlet 70132b. The driving assembly 8 continuously drives, the cam shaft 1 continuously rotates, the guide slider 5 and the connecting rod 6 also continuously reciprocate, and the piston assembly 702 continuously inhales and compresses air in the cylinder assembly 701, forming a continuous gas suction and compression process, and finally achieving a vacuum effect.

[0037] The first bearing 2 and the second bearing 4 play the role of bearing and positioning, ensuring that the cam main shaft 1 and the double eccentric cam 3 can rotate smoothly and accurately; when the cam main shaft 1 rotates, the circular motion of the double eccentric cam 3 is converted into the reciprocating linear motion of the connecting rod 6, and this linear motion directly drives the piston assembly 7 to perform synchronous reciprocating motion in the cylinder assembly 701.

[0038] The above-mentioned arrangement can solve the shortcomings of various existing vacuum machines and improve the efficiency of the vacuum machine. The utility model can not only effectively make the vacuum machine easy to operate, reliable in operation, energy-saving and efficient, and highly wear-resistant, but also easy to manufacture, save materials, and save costs.

[0039] When the cam main shaft 1 rotates, the first bearing 2 mounted thereon also rotates, and the first bearing 2 drives the double eccentric cam 3. Due to its design, the motion trajectory of the double eccentric cam 3 will deviate from the center line, resulting in eccentric motion. The double eccentric second bearing 4 performs corresponding circular motion in the guide slider 5, and drives the piston assembly 702 to perform reciprocating linear motion in the cylinder assembly 701 through the connecting rod 6. The above mechanical motion completes a reciprocating cycle, that is, the piston assembly 702 completes an intake and exhaust process in the cylinder assembly 701.

[0040] Further, if Figure 9-13As shown, the cam main shaft 1 includes a connecting end 101 and a transmission end 102 , the central axis of the transmission end 102 coincides with the central axis of the cam main shaft 1 , and the central axis of the connecting end 101 is eccentrically arranged with the central axis of the cam main shaft 1 ; the driving assembly 8 is transmission-connected to the transmission end 102 .

[0041] Specifically, the central axis of the transmission end 102 coincides with the central axis of the cam main shaft 1 , thereby ensuring direct and stable power transmission from the drive assembly to the cam main shaft 1 .

[0042] The central axis of the connecting end 101 is eccentric relative to the central axis of the cam shaft 1. This eccentric setting is the core mechanism for converting rotational motion into reciprocating linear motion. The greater the eccentricity, the greater the amplitude of the reciprocating motion generated. Therefore, this design can be adjusted as needed to adapt to different compression requirements.

[0043] The driving component 8 can preferably be an ordinary electric motor. After the motor is started, it drives the cam main shaft 1 to make a 360-degree circular motion, and then the cam main shaft 1 drives the double eccentric wheel 3 to rotate, and the double eccentric wheel 3 drives the guide slider 5 to reciprocate back and forth along its length direction, and drives the piston assembly 702 to make a piston motion in the cylinder assembly 701, so that the working volume formed by the inner wall of the cylinder assembly 701 and the piston assembly 702 will undergo periodic changes.

[0044] Further, if Figure 9-13 As shown, there are multiple first bearings 2 , which are spaced apart and sleeved on the connecting end 101 , with gaskets 9 provided between each first bearing 2 ; the double eccentric cam 3 includes a connecting hole 301 circumferentially matched with the outer diameter of the first bearing 2 .

[0045] Specifically, using a plurality of first bearings 2 can more evenly disperse the load and stress generated by the eccentric motion, and can improve the overall stability of the system, especially under high-speed operation and high-load conditions, and help maintain the correct alignment and smooth operation of the cam shaft 1; placing a gasket 9 between each first bearing 2 can accurately adjust the distance between the bearings, and the appropriate spacing helps to optimize the load distribution of the bearings and reduce friction and wear;

[0046] The connection hole 301 is used to fit tightly with the outer diameter of the first bearing 2. This fitting method helps to ensure the stability and accuracy of the double eccentric cam 3 during rotation, thereby reducing mechanical vibration and wear; ensuring a tight connection between the double eccentric cam 3 and the first bearing 2 can more effectively transmit the rotational power of the cam main shaft 1 to the double eccentric cam 3, and then to the entire mechanical drive system.

[0047] Further, if Fig.10 and Fig.16As shown, the double eccentric cam 3 includes an eccentric wheel periphery 302, and the inner diameter of the second bearing 4 is sleeved on the eccentric wheel periphery 302; an inner cavity 501 is provided on the guide slider 5, and the outer diameter of the second bearing 4 is circumferentially matched with the inner cavity 501.

[0048] Specifically, the eccentric wheel periphery 302 allows the second bearing 4 to be mounted thereon, allowing the double eccentric cam 3 to produce regular eccentric motion when rotating, thereby pushing the connecting rod 6 and the piston assembly to complete reciprocating motion;

[0049] The outer diameter of the second bearing 4 is precisely matched with the inner cavity 501 on the guide slider 5, ensuring the correct position and stability of the second bearing 4 in the guide slider 5, so that it can run smoothly without displacement or excessive swing.

[0050] Further, if Fig.14 As shown, more than one guide slider 5 is provided, and the more than one guide slider 5 is relatively arranged on the cam main shaft 1; a plurality of through holes 303 are provided on the double eccentric cam 3.

[0051] Specifically, in this embodiment, there are two guide sliders 5, and at least two guide sliders 5 move back and forth in mutually horizontal directions under the action of the double eccentric cam 3. The length direction of one guide slider 5 is set horizontally from left to right, and the length direction of the other guide slider 5 is set horizontally from front to back. The connecting rod 6 on each guide slider 5 is connected to the piston assembly 7 and the cylinder assembly 701 in a group transmission; thereby realizing a vacuum machine with various cylinder numbers: 1 cylinder, 2 cylinders, 3 cylinders, 4 cylinders, 5 cylinders, 6 cylinders, 7 cylinders, 7 cylinders, 9 cylinders, 10 cylinders, 11 cylinders, or 12 cylinders. In this embodiment, a connecting rod 6 is provided on both sides of each guide slider 5 to drive a group of cylinder assemblies 701 (i.e., 2 cylinders); the through hole 303 can reduce weight, reduce energy consumption and operating costs, and increase airflow to dissipate heat.

[0052] Further, if Figure 7 and Fig.10 As shown, the oil-free vacuum machine also includes a pump housing 10, a drive assembly 8, and a cylinder assembly 701 are installed on the outside of the pump housing 10, a plurality of installation openings 1001 are provided on the pump housing 10, the cylinder assembly 701 and the piston assembly 702 form a compression structure 7, and the compression structure 7 is provided with a plurality of groups, and the plurality of groups of compression structures 7 are installed and arranged corresponding to the installation openings 1001 respectively; a third bearing 11 and a rear end cover 12 are provided on the pump housing 10, the third bearing 11 is fixedly installed on the top of the pump housing 10 through the rear end cover 12, and the rear end cover 12 is fixedly connected to the pump housing 10 by screws.

[0053] Specifically, by installing the drive assembly 8 and the cylinder assembly 701 outside the housing 10, they are easy to inspect, maintain and replace, thereby improving the maintainability of the overall system; adding a third bearing 11 to the cam main shaft 1 helps to better disperse and bear the forces generated by the cam main shaft 1 and other drive components, which can significantly reduce the bending and deviation of the shaft, thereby improving the operating accuracy and reliability of the entire system; the rear end cover 14 not only serves to close the housing 10 and protect the internal components from the influence of the external environment, but also provides a solid mounting point, which is fixedly connected to the housing 10 by screws, ensuring the stability and protection of the third bearing 11. The design of fixing the rear end cover 14 with screws facilitates the removal and replacement of the bearing or maintenance of the system when necessary.

[0054] Further, if Figure 1-Figure 4 As shown, the cylinder assembly 701 includes a cylinder body 7011, a cylinder sleeve 7012 and a valve cover 7013. The cylinder sleeve 7012 is installed on the cylinder body 7011. The piston assembly 702 moves back and forth in the cylinder sleeve 7012 through the connecting rod 6. The valve cover 7013 is covered on one end of the cylinder body 7011. The inner cavity of the valve cover 7013 is divided into a positive pressure chamber 70131 and a negative pressure chamber 70132. The air inlet 70131a is located on the positive pressure chamber 70131, and the air outlet 70132b is located on the negative pressure chamber 70132. A conducting pipe 13 is provided between each compression structure 7. The air inlet 70131a on each compression structure 7 is connected through the conducting pipe 13. The conducting pipe 13 is connected to a vacuum container box. The gas in the vacuum container box is supplied to the positive pressure chamber 70131 through the conducting pipe 13.

[0055] Specifically, the role of the vacuum container box in the oil-free vacuum machine is to connect to the cylinder assembly 701 and each compression structure 7 through the guide pipe 13 to ensure that the gas can flow evenly in the system. The driving assembly 8 drives the cam main shaft 1 to rotate through the connecting end 101, and the first bearing 2 on the cam main shaft 1 rotates accordingly, driving the double eccentric cam 3 to rotate eccentrically. The second bearing 4 on the double eccentric cam 3 performs a circular motion in the guide slider 5. The guide slider 5 limits the motion trajectory of the second bearing 4 and converts its circular motion into a linear reciprocating motion; the guide slider 5 drives the connecting rod 6 to perform a linear reciprocating motion. The connecting rod 6 is connected to the piston assembly 702, so the linear motion of the connecting rod directly drives the piston assembly in the cylinder assembly 701. Reciprocating motion inside, when the connecting rod 6 drives the piston assembly 702 to move forward, the positive pressure chamber 70131 draws the gas in the vacuum container box through the air inlet 70131a, and the volume in the cylinder sleeve 7012 increases, forming a negative pressure; when the connecting rod 6 drives the piston assembly 702 to move reversely, the volume in the cylinder sleeve 7012 decreases, the gas is compressed, and the compressed gas is discharged through the air outlet 70132b of the negative pressure chamber 70132; through the continuous driving of the driving assembly 8, the cam main shaft 1 continuously rotates, the guide slider 5 and the connecting rod 6 also continuously reciprocate, the piston assembly 702 continuously inhales and compresses in the cylinder assembly 701, forming a continuous gas suction and compression process, and finally achieving the vacuum effect.

[0056] Further, if Figure 5-Figure 7 As shown, a ventilation assembly 7014 is provided between the cylinder liner 7012 and the valve cover 7013, and the ventilation assembly 7014 includes a first ventilation valve plate 70141 and a second ventilation valve plate 70142. The first ventilation valve plate 70141 cooperates with the cylinder liner 7012, and the second ventilation valve plate 70142 cooperates with the valve cover 7013. The first ventilation valve plate 70141 is provided with a first ventilation hole 70141c, and the second ventilation valve plate 70142 is provided with a second ventilation hole 70142d. When the first ventilation valve plate 70141 cooperates with the second ventilation valve plate 70142, the first ventilation hole 70141c and the second ventilation hole 70142d are staggered.

[0057] Specifically, the ventilation assembly 7014 is located between the cylinder liner 7012 and the valve cover 7013, and plays a role in regulating the inflow and outflow of gas; the first ventilation valve plate 70141 cooperates with the cylinder liner 7012: ensuring that the first ventilation valve plate can effectively control the path of gas through the cylinder liner; the second ventilation valve plate 70142 cooperates with the valve cover 7013: ensuring that the second ventilation valve plate can effectively control the path of gas through the valve cover; the first ventilation hole 70141c and the second ventilation hole 70142d are staggered: this design ensures that gas exchange can be achieved through the ventilation holes only under specific conditions (such as pressure difference), thereby controlling the inflow and outflow path of the gas and avoiding direct passage of the gas.

[0058] Further, if Figure 5-Figure 7 As shown, there are multiple piston assemblies 702, which are symmetrically arranged on both ends of the connecting rod 6 and serve as positioning guides in the cylinder assembly 701. The piston assembly 702 includes a piston ring 7021, a leather cup 7022 and a leather cup pressure cover 7023. The piston ring 7021 is circumferentially sleeved on the end of the connecting rod 6, and the leather cup 7022 and the leather cup pressure cover 7023 are arranged on the end of the connecting rod 6.

[0059] Specifically, the piston assembly 702 is symmetrically arranged at both ends of the connecting rod 6 to ensure balanced and stable movement in the cylinder assembly 701. The symmetrical arrangement can reduce vibration during movement and improve the smooth operation of the equipment; the piston ring 7021 is sleeved on the circumference of the end of the connecting rod 6 to play a sealing and guiding role to ensure that the piston maintains sealing during the reciprocating motion in the cylinder.

[0060] Further, if Figure 8-Figure 13 As shown, a cam balance block 14 is provided on the connecting end 101 .

[0061] Specifically, the cam balance block 14 is used to adjust and optimize the load balance of the cam main shaft 1. In high-speed rotation applications, the cam main shaft 1 may cause excessive or uneven loads on certain parts due to its structure. The cam balance block 14 can compensate for this imbalance by adjusting the weight distribution and reduce mechanical vibration and noise.

[0062] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0063] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0064] In the present invention, unless otherwise clearly defined and specified, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0065] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0066] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0067] It should also be understood that when explaining the connection relationship or positional relationship of elements, although not explicitly described, the connection relationship and positional relationship are interpreted as including an error range, which should be within the acceptable deviation range of a specific value determined by those skilled in the art. For example, "approximately", "approximately" or "substantially" may mean within one or more standard deviations, which are not limited here.

[0068] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0069] The above embodiments only express several implementation methods of the utility model, and the descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. An oil-free vacuum machine, characterized in that: The invention comprises a cam main shaft (1), a first bearing (2) sleeved on the cam main shaft (1), a double eccentric cam (3) sleeved on the first bearing (2), a second bearing (4) sleeved on the double eccentric cam (3) and a guide slider (5), and a driving assembly (8) for driving the cam main shaft (1) to rotate, wherein the guide slider (5) is provided with a connecting rod (6), and the connecting rod (6) is provided with a cylinder assembly (701) and a piston assembly (702) which are screwed together and horizontally opposed, and the cylinder assembly (701) has an air inlet (70131a) for extracting high-pressure gas into the cylinder assembly (701) and a piston assembly (702) for injecting high-pressure gas into the cylinder assembly (701). The double eccentric cam (3) is driven by the first bearing (2) mounted on the cam main shaft (1) to make a corresponding circular motion in the guide slider (5). The connecting rod (6) drives the piston assembly (702) to make a reciprocating linear motion on the same plane and the center line of the cylinder assembly (701). When the piston assembly (702) makes a reciprocating linear motion, it draws air through the air inlet (70131a) and exhausts air from the air outlet (70132b) to complete a reciprocating cycle.

2. The oil-free vacuum machine according to claim 1, characterized in that: The cam main shaft (1) comprises a connecting end (101) and a transmission end (102); the central axis of the transmission end (102) coincides with the central axis of the cam main shaft (1); the central axis of the connecting end (101) is eccentrically arranged with the central axis of the cam main shaft (1); and the driving assembly (8) is transmission-connected to the transmission end (102).

3. The oil-free vacuum machine according to claim 2, characterized in that: A plurality of the first bearings (2) are provided, and the plurality of the first bearings (2) are sleeved on the connection end (101) at intervals, and a gasket (9) is provided between each of the first bearings (2); the double eccentric cam (3) comprises a connection hole (301) circumferentially matched with the outer diameter of the first bearing (2).

4. The oil-free vacuum machine according to claim 1, characterized in that: The double eccentric cam (3) comprises an eccentric wheel periphery (302), and the inner diameter of the second bearing (4) is sleeved on the eccentric wheel periphery (302); an inner cavity (501) is provided on the guide slider (5), and the outer diameter of the second bearing (4) is circumferentially matched and connected with the inner cavity (501).

5. The oil-free vacuum machine according to claim 1, characterized in that: There is more than one guide slider (5), and the more than one guide slider (5) is relatively arranged on the cam main shaft (1); and the double eccentric cam (3) is provided with a plurality of through holes (303).

6. The oil-free vacuum machine according to claim 2, characterized in that: The oil-free vacuum machine further comprises a pump housing (10), the drive assembly (8) and the cylinder assembly (701) being mounted on the outside of the pump housing (10), the pump housing (10) being provided with a plurality of mounting openings (1001), the cylinder assembly (701) and the piston assembly (702) forming a compression structure (7), the compression structure (7) being provided with a plurality of groups, the plurality of groups of compression structures (7) being respectively mounted and arranged corresponding to the mounting openings (1001); the pump housing (10) being provided with a third bearing (11) and a rear end cover (12), the third bearing (11) being fixedly mounted on the top of the pump housing (10) via the rear end cover (12), the rear end cover (12) being fixedly connected to the pump housing (10) via screws.

7. The oil-free vacuum machine according to claim 6, characterized in that: The cylinder assembly (701) comprises a cylinder body (7011), a cylinder sleeve (7012) and a valve cover (7013); the cylinder sleeve (7012) is mounted on the cylinder body (7011); the piston assembly (702) reciprocates in the cylinder sleeve (7012) via the connecting rod (6); the valve cover (7013) is mounted on one end of the cylinder body (7011); the inner cavity of the valve cover (7013) is divided into a positive pressure chamber (70131) and a negative pressure chamber (70132); the air inlet ( The positive pressure chamber (70131a) is located on the positive pressure chamber (70131), the air outlet (70132b) is located on the negative pressure chamber (70132), a conducting pipe (13) is provided between each of the compression structures (7), the air inlet (70131a) on each of the compression structures (7) is connected via the conducting pipe (13), the conducting pipe (13) is connected to a vacuum container box, and the gas in the vacuum container box is supplied to the positive pressure chamber (70131) via the conducting pipe (13).

8. The oil-free vacuum machine according to claim 7, characterized in that: A ventilation assembly (7014) is provided between the cylinder sleeve (7012) and the valve cover (7013), and the ventilation assembly (7014) comprises a first ventilation valve plate (70141) and a second ventilation valve plate (70142); the first ventilation valve plate (70141) cooperates with the cylinder sleeve (7012), and the second ventilation valve plate (70142) cooperates with the valve cover (7013); a first ventilation hole (70141c) is provided on the first ventilation valve plate (70141), and a second ventilation hole (70142d) is provided on the second ventilation valve plate (70142); when the first ventilation valve plate (70141) cooperates with the second ventilation valve plate (70142), the first ventilation hole (70141c) and the second ventilation hole (70142d) are arranged in a staggered manner.

9. The oil-free vacuum machine according to claim 1, characterized in that: The piston assembly (702) is provided in plurality. The piston assembly (702) is symmetrically arranged at both ends of the connecting rod (6) and serves as a positioning guide in the cylinder assembly (701). The piston assembly (702) comprises a piston ring (7021), a leather cup (7022) and a leather cup pressure cover (7023). The piston ring (7021) is sleeved on the circumference of the end of the connecting rod (6), and the leather cup (7022) and the leather cup pressure cover (7023) are arranged on the end of the connecting rod (6).

10. The oil-free vacuum machine according to claim 2, characterized in that: A cam balancing block (14) is provided on the connecting end (101).

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