Eccentric wheel structure and air compressor

Abstract

The invention discloses an eccentric wheel structure and an air compressor, and belongs to the technical field of air compressors, the eccentric wheel structure comprises a circular first mounting part (1), and a first through hole (11) is formed in the position, deviating from the circle center, in the first mounting part (1); a second through hole (212) which coincides with and communicates with the axis of the first through hole (11) is formed in the second mounting part (2), one end of the second mounting part (2) is fixedly connected with the first mounting part (1) in the axis direction of the rotor shaft, and the other end of the second mounting part (2) is fixedly connected with the third mounting part (3) in the radial direction of the rotor shaft or is integrally formed with the third mounting part (3); the third mounting part (3) is formed into a sector ring shape and is used for a counterweight part of the eccentric wheel structure; the projection area of the second installation part (2) is located on the lower portion of the first installation part (1), and the projection area of the second installation part (2) is 60%-80% of the area of the first installation part (1). The gravity center of the eccentric wheel deviates in the direction of the third installation part, the mass center of the balance weight part is farther away from the rotation center, relative rotation inertia force is increased, the inertia force is improved, preparation materials are saved, and occupied space is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of air compressors, and in particular to an eccentric wheel structure and an air compressor. Background Art

[0002] There are two main types of oil-free air compressors for oxygen concentrators on the market. One type of oil-free air compressor has a connecting rod component, an eccentric wheel, a rotor bearing, and an eccentric wheel bearing. When the oil-free air compressor is working, the connecting rod component, the eccentric wheel, the rotor bearing, and the eccentric wheel bearing rotate at high speed. The eccentric wheel used in common oil-free air compressors drives the connecting rod to make reciprocating motion. The connecting rod is subjected to greater force during the compression process and less force during the retraction. The eccentric wheel structure needs to increase the counterweight to make it run smoothly. In order to provide sufficient eccentric force, the existing eccentric wheel usually has a large volume and requires more raw materials for production. It is easy to interfere with other parts in the oil-free air compressor when rotating, and it is difficult to install in the oil-free air compressor housing. Summary of the invention

[0003] The purpose of the present application is to provide a reduced eccentric wheel structure to solve the problems of large volume, heavy weight and high assembly difficulty of the eccentric wheel structure in the prior art.

[0004] According to a first aspect of the present application, an eccentric wheel structure is provided, which includes a first mounting portion 1, which is formed in a circular shape, and a first through hole 11 is provided at a position offset from the center of the circle, which is used to fix and connect the rotor shaft or the output shaft driven by the rotor shaft; a second mounting portion 2, in which a second through hole 212 is provided, which coincides with and is connected to the axis of the first through hole 11, and one end of which is fixedly connected to the first mounting portion 1 along the axial direction of the rotor shaft, and the other end is fixedly connected to the third mounting portion 3 along the radial direction of the rotor shaft or is integrally formed with the third mounting portion 3; the third mounting portion 3 is formed in a fan-shaped shape and is used as the counterweight part of the eccentric wheel structure; wherein the projection area of ​​the second mounting portion 2 is located at the lower part of the first mounting portion 1, and its projection area is 60%-80% of the area of ​​the first mounting portion 1.

[0005] Preferably, the outer diameter of the second mounting portion 2 is greater than or equal to 1 / 4 of the outer diameter of the first mounting portion 1 , and less than or equal to 4 / 5 of the outer diameter of the first mounting portion 1 .

[0006] Through this downward eccentric design, the overall center of gravity of the eccentric wheel structure is shifted toward the direction of the third mounting portion 3, and the connecting portion (second mounting portion) of the eccentric wheel is greatly reduced, thereby greatly reducing the weakening effect of the weight of the connecting portion on the balancing effect. In this way, the weight of the second mounting portion 2 weakens the counterweight effect of the third mounting portion 3 as the counterweight portion less, reducing the weight and volume of the entire eccentric wheel, and also allowing the eccentric wheel to have room for further reduction.

[0007] Optionally, a third through hole 211 vertically connected to the second through hole 212 is provided on the upper portion of the second mounting portion 2; and a portion of the second mounting portion 2 located above the second through hole 212 is set to a minimum thread length for screw installation.

[0008] By this arrangement, the second mounting portion 2 is reduced to only the space necessary for mounting the screws, resulting in that the rotation radius R of the eccentric wheel is reduced by about 23% and the weight of the eccentric wheel is reduced by about 13%.

[0009] Optionally, fourth through holes 311 vertically connected to the second through hole 212 are provided on both sides or any one side of the second mounting portion 2; and a portion of the second mounting portion 2 located above the second through hole 212 is set to have a thread length of 1-8.

[0010] Optionally, a fourth through hole 311 vertically connected to the second through hole 212 is provided inside the third mounting portion 3; and a portion of the second mounting portion 2 located above the second through hole 212 is set to have a thread length of 1-10.

[0011] With this structural arrangement, the portion of the second mounting portion 2 located above the second through hole 212 can be further reduced, thereby reducing its volume and weight, and ultimately achieving a reduction in the rotation radius R of the rear eccentric by about 26% and a reduction in the weight of the eccentric by about 17%.

[0012] Optionally, when the second mounting portion 2 is reduced, the third mounting portion 3 is reduced in proportion without affecting the deflection balance force of the eccentric wheel structure, so that the rotation radius of the eccentric wheel is reduced to 10%-23%.

[0013] Optionally, when the second mounting portion 2 is reduced, at least a portion of the third mounting portion 3 away from the second mounting portion 2 is reduced so that the rotational inertia force formed by the reduced portion is roughly equal to the rotational inertia force formed by the reduced area of ​​the second mounting portion 2.

[0014] Preferably, the outer diameter of the end of the third mounting portion 3 away from the second mounting portion 2 is reduced by 1 / 4 to 1 / 2.

[0015] Optionally, a counterweight block 31 having a material density greater than that of the third mounting portion 3 is disposed on the third mounting portion 3 .

[0016] In this way, a larger deflection inertia force can be obtained without increasing the overall size of the eccentric wheel, so that a larger rotational inertia force can be balanced with a minimum eccentric wheel size.

[0017] According to another aspect of the present invention, an air compressor is provided, which includes: a motor and a cylinder, and the eccentric wheel structure described in any one of the above embodiments.

[0018] The above technical solution of the present application has the following beneficial technical effects:

[0019] The embodiment of the present application provides a reduced eccentric wheel structure, which realizes a variety of reduced eccentric wheel structures by reducing at least a part of the upper area of ​​the second mounting portion, on the one hand, achieving the balance and stability of the rotational inertia force and reducing the vibration of the eccentric wheel structure. On the other hand, the volume and weight of the eccentric wheel structure are significantly reduced, and the rotation area of ​​the eccentric wheel is reduced, which provides design space for the miniaturization and compact structure of the air compressor as a whole, and provides the possibility of designing air compressors of various models, specifications and sizes, saving manufacturing materials and expanding the scope of use of the air compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] FIG1 is a schematic structural diagram of an eccentric wheel of the present invention.

[0021] in, Figure 1a A schematic diagram showing the structure of the back side of the eccentric wheel. Figure 1b A schematic diagram showing the cross section of an eccentric wheel. Figure 1c A schematic diagram showing the structure of the front side of the eccentric wheel.

[0022] FIG. 2 is a schematic diagram of an optimized eccentric wheel structure in a preferred embodiment of the present invention.

[0023] in, Figure 2a A schematic diagram showing the structure of the back side of the eccentric wheel. Figure 2b A schematic diagram showing the cross section of an eccentric wheel. Figure 2c A schematic diagram showing the structure of the front side of the eccentric wheel.

[0024] Figure 3 A schematic diagram of the eccentric wheel structure further optimized in the present invention is shown.

[0025] FIG. 4 is a schematic diagram of an optimized eccentric wheel structure in another embodiment of the present invention.

[0026] in, Figure 4a This is a schematic diagram of the optimized eccentric wheel front shape. Figure 4b This is the side cross-sectional view of the optimized eccentric wheel. Figure 4c Schematic diagram of the optimized eccentric wheel rotation area.

[0027] FIG. 5 is a schematic diagram of the optimized eccentric wheel structure according to another embodiment of the present invention.

[0028] in, Figure 5a This is a schematic diagram of the optimized eccentric wheel. Figure 5b It is a cross-sectional schematic diagram of the eccentric wheel after optimization.

[0029] FIG6 is a schematic structural diagram of an optimized rear eccentric wheel according to another optional embodiment of the present application.

[0030] in, Figure 6a A schematic diagram showing the structure of a fourth through hole arranged inside the third mounting portion 3, Figure 6b A schematic structural diagram showing that fourth through holes are arranged on both sides of the second mounting portion. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application is further described in detail below in conjunction with specific implementations and with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present application. In addition, in the following description, the description of known structures and technologies is omitted to avoid unnecessary confusion of the concepts of the present application.

[0032] The eccentric wheel provided in the embodiment of the present application is described in detail below through specific embodiments and their application scenarios in conjunction with the accompanying drawings.

[0033] FIG1 is a schematic diagram of the structure of an eccentric wheel of the present invention. Figure 1a A schematic diagram showing the structure of the back side of the eccentric wheel. Figure 1b A schematic diagram showing the cross section of an eccentric wheel. Figure 1c A schematic diagram showing the structure of the front side of the eccentric wheel.

[0034] like Figure 1a-Figure 1c As shown, the eccentric wheel structure of the present invention generally includes three parts: a first mounting part 1, a second mounting part 2 and a third mounting part 3.

[0035] The first mounting part 1 is internally fixedly connected to the rotor shaft 5 or the output shaft driven by the rotor shaft 5; the connecting rod 4 is externally movably connected, and the connecting rod 4 is driven to reciprocate under the drive of the rotor shaft 5; the rotor shaft 5 is usually the shaft of the motor. The projection shape of the first mounting part 1 is circular, and a first through hole 11 is provided in the first mounting part 1, which is used to fix the rotor shaft 5 or the output shaft driven by the rotor shaft 5. The central axis of the first through hole 11 and the central axis of the first mounting part 1 do not overlap, but are parallel to each other, that is, the first mounting part 1 is an eccentric wheel, which performs eccentric motion under the drive of the rotor shaft 5, and drives the other end of the connecting rod 4 to perform linear reciprocating motion.

[0036] One end of the second mounting portion 2 is fixedly connected to the first mounting portion 1 along the axial direction of the rotor shaft, and the other end is fixedly connected to the third mounting portion 3 along the radial direction of the rotor shaft or is integrally formed with the third mounting portion 3. A second through hole 212 is provided on the end surface of the second mounting portion 2, and the second through hole 212 is connected to the first through hole 11 to form an assembly hole for the rotor shaft to pass through so as to be installed in cooperation with the rotor shaft, and the central axis of the second through hole 212 coincides with the central axis of the first through hole 11.

[0037] The second mounting portion 2 is provided with a third through hole 211, such as Figure 1b As shown, the third through hole 211 passes through the outer surface of the second mounting portion 2 and the second through hole 212 therein. During assembly, the third through hole 211 is connected with a fastener so that the fastener presses the rotor shaft to form a fixed structure. When the rotor shaft rotates, the first mounting portion 1 and the second mounting portion 2 can be driven to perform eccentric movement. Preferably, the third through hole 211 is arranged to be vertically connected to the second through hole 212.

[0038] Typically, the projection area of ​​the second mounting portion 2 is set to be slightly smaller than or equal to the area of ​​the first mounting portion 1. In this case, the center of gravity of the second mounting portion 2 is substantially close to or slightly lower than the center of gravity of the first mounting portion 1. In an optional embodiment, the second mounting portion 2 is formed as a first connecting member 21 with a projection shape of an arc, and preferably, the projection shape of the first connecting member 21 is a semicircle, and its outer diameter value is slightly smaller than or equal to the outer diameter value of the first mounting portion 1.

[0039] The third mounting portion 3 is connected to the side end surface of the second mounting portion 2, see Figure 1c The third mounting portion 3 is formed into a fan ring shape so that its center of gravity is located outside the axis of the rotor shaft. It is used as the counterweight part of the eccentric wheel structure and plays a counterweight role in the eccentric rotation.

[0040] The second mounting part 2 constitutes a connecting part of the eccentric wheel structure, and is mainly used to connect the first mounting part 1 for mounting the bearing and the third mounting part 3 for balancing the inertial force. The third mounting part 3 is used as a counterweight part to balance the rotational inertial force, and includes the first mounting part 1 for mounting the bearing, the bearing mounted thereon, and the rotating part converted by the connecting rod on the bearing. The rotational inertial force generated by these three parts ultimately realizes the control of the vibration amplitude of the air compressor.

[0041] It can be seen that the second mounting portion 2, which is the connecting portion of the eccentric wheel, is closer to the first mounting portion 1, which is the bearing mounting portion, and is farther away from the third mounting portion 3, which is the balancing inertia force portion, relative to the center of mass (mass center) of the rotating shaft. Therefore, the weight of the second mounting portion 2 weakens the balancing effect brought by the weight of the balancing inertia force portion, resulting in the overall heavy weight and large volume of the existing eccentric wheel.

[0042] At the same time, the volume and weight of the entire eccentric wheel structure are relatively large, which also leads to a large space occupied by the eccentric wheel when rotating (in order to avoid interference with other parts during rotation), resulting in a large overall size of the air compressor.

[0043] FIG2 is a schematic diagram of an optimized eccentric wheel structure in a preferred embodiment of the present invention. Figure 2a A schematic diagram showing the structure of the back side of the eccentric wheel. Figure 2b A schematic diagram showing the cross section of an eccentric wheel. Figure 2cA schematic diagram showing the structure of the front side of the eccentric wheel.

[0044] As shown in FIG2, in this preferred embodiment, the other components are substantially the same as the eccentric wheel structure shown in FIG1. Figure 2a-2c , the shaded parts S in the figure are all the reduced parts of the second mounting part 2 in this preferred embodiment. Specifically, the outer side of the second mounting part 2 is reduced toward the direction of the third mounting part 3, so that the projection area of ​​the second mounting part 2 is located at the lower part of the first mounting part 1, and its projection area is reduced to 60%-80% of the area of ​​the first mounting part 1, preferably reduced to 70%. At the same time, after being reduced downward, the center of gravity of the second mounting part 2 is lower than the center of gravity of the first mounting part 1. Preferably, the outer diameter value of the second mounting part 2 is set to be greater than or equal to 1 / 4 of the outer diameter value of the first mounting part 1, and less than or equal to 4 / 5 of the outer diameter value of the first mounting part 1.

[0045] See also Figure 2b The center of mass (mass center) of the reduced area S (shaded part) is usually above the rotor axis, and the center of mass of the third mounting portion 3 (fan-shaped part) is below the rotor axis. Therefore, there is a reverse balancing rotational inertia moment in the reduced area, which will affect the overall rotational balance of the eccentric wheel structure and cause the amplitude to increase. This is unreasonable and needs to be reduced.

[0046] In a preferred embodiment, the second mounting portion 2 is formed as a first connecting portion 21 having a semicircular projection shape, and the projected area of ​​the reduced first connecting member 21 is reduced to 60%-80%, preferably to 70%, of the area of ​​the first mounting portion 1. Accordingly, the radius of the first connecting member 21 is set to a ratio greater than or equal to 1 / 4 and less than or equal to 4 / 5 to the radius of the first mounting portion 1.

[0047] The following explains the magnitude of the eccentric design, such as Figure 2b As shown, the upper part of the second mounting part 2 of the eccentric wheel is provided with a third through hole 211 (preferably a threaded hole) for fastening to the rotor shaft during assembly. In the case where the third through hole 211 is provided on the upper part of the second mounting part 2, the reduced second mounting part 2 needs to retain the minimum thread length for screw installation, so the second mounting part 2 is reduced to only the necessary space for mounting the screw, for example, a minimum length of 5 pitches. In this embodiment, the rotation radius R of the eccentric wheel is reduced by about 23% after reduction, and the weight of the eccentric wheel is reduced by about 13%.

[0048] Furthermore, the third mounting portion (counterweight portion) can be arranged below the first mounting portion through an eccentric design.

[0049] In this preferred embodiment, through the downward eccentric design scheme, that is, by reducing the outer diameter of the second mounting part 2 in the direction of the eccentric wheel, the overall center of gravity of the eccentric wheel structure is shifted toward the direction of the third mounting part 3, and the connecting part of the eccentric wheel (the second mounting part) is greatly reduced, thereby greatly reducing the weakening effect of the weight of the connecting part on the balancing effect.

[0050] In this way, the weight of the second mounting part 2 less weakens the counterweight effect of the third mounting part 3 as the counterweight part, thereby reducing the weight and volume of the entire eccentric wheel and allowing room for further reduction of the eccentric wheel.

[0051] Ultimately, the relative rotational inertia force of the optimized eccentric wheel structure is increased, which helps to improve the inertia force and save preparation materials. At the same time, it reduces the space occupied by the eccentric wheel, reduces the difficulty of assembling the eccentric wheel, can form a stable structure, and improves the stability of the eccentric wheel rotation.

[0052] Figure 3 A schematic diagram of the eccentric wheel structure further optimized in the present invention is shown.

[0053] like Figure 3 As shown, the eccentric wheel is installed in the cavity of the air compressor, and rotates around the rotation center of the rotor shaft. The rotation radius is R, that is, the maximum distance from the center of the first through hole 11 on the eccentric wheel for assembling the rotor shaft to the edge of the eccentric wheel. The circle formed with R as the radius is the rotation area of ​​the eccentric wheel fan-shaped surface. The distance between the outer contour of the rotating area and the shell is X. In order to obtain a larger eccentric force, the smaller the distance, the better. It is preferably set within the range of 0.5 to 1.5 mm. Therefore, through the embodiments of the present invention, a smaller eccentric wheel can be designed and assembled, and the same or larger rotational inertia force can be obtained, and then a more miniaturized air compressor can be designed.

[0054] In the embodiment shown in FIG2 , by reducing the second mounting portion 2, a design space is provided for reducing the balancing inertia force of the eccentric wheel in the same proportion (the third mounting portion) without affecting the balancing inertia force of the eccentric wheel. Specifically, two optimization designs can be adopted at the same time, that is, reducing the second mounting portion 2 downward to move its center of mass downward (the embodiment shown in FIG2 ), and reducing the third mounting portion 3 (the fan-shaped portion) in the same proportion to reduce its weight. Thus, the lightweight of the product can be achieved according to actual needs, or a design space can be provided for a more complex structure inside the air compressor.

[0055] Preferably, the third mounting part (sector-shaped part) can be proportionally reduced while keeping the contour of the third mounting part (sector-shaped part) unchanged, so that its weight is reduced by about 10%-30%. As a result, the center of mass of the third mounting part, which is the part balancing the inertial force, moves toward the rotating shaft hole, so that the space occupied by the eccentric wheel when rotating is reduced, and the rotation radius can be reduced by 10%-23%. In a preferred embodiment, by proportionally reducing the third mounting part, the weight of the third mounting part can be reduced by 15%, and the rotation radius of the eccentric wheel can be reduced by 13%.

[0056] FIG4 is a schematic diagram of an optimized eccentric wheel structure in another embodiment of the present invention. Figure 4a This is a schematic diagram of the optimized eccentric wheel front shape. Figure 4b This is the side cross-sectional view of the optimized eccentric wheel. Figure 4c Schematic diagram of the optimized eccentric wheel rotation area.

[0057] As shown in FIG4 , the eccentric wheel in this embodiment also includes a first mounting portion 1, a second mounting portion 2 and a third mounting portion 3. The first mounting portion 1 is provided with a first through hole 11 penetrating along the thickness direction thereof, and the central axis of the first through hole 11 is located between the central axis of the first mounting portion 1 and the third mounting portion 3. The second mounting portion 2 is fixedly connected to the first mounting portion 1, and the second mounting portion 2 is provided with a second through hole 212 penetrating along the thickness direction thereof, the second through hole 212 is connected to the first through hole 11, the central axis of the second through hole 212 coincides with the central axis of the first through hole 11, and the second mounting portion 2 is provided with a third through hole 211 perpendicular to the axis of the second through hole 212, and the third through hole 211 is connected to the second through hole 212.

[0058] The third mounting portion 3 is fixedly connected to the second mounting portion 2. The third mounting portion 3 is a fan-shaped disc-shaped structure, and the center of the third mounting portion 3 is fixedly connected to the periphery of the second mounting portion 2. Figure 4a , Figure 4b As shown, unlike other embodiments of the present invention, in this embodiment, the third mounting portion 3 is at least partially reduced away from the outer side of the second mounting portion 2, so that the rotational inertia force formed by the cut portion of the third mounting portion 3 is roughly equal to the rotational inertia force formed by the reduced area of ​​the second mounting portion. Specifically, the outer diameter of the end of the third mounting portion 3 away from the second mounting portion 2 can be reduced by 1 / 4 to 1 / 2, preferably by 1 / 3. After the third mounting portion 3 is cut, it is formed into a reduced area S with an approximate quadrilateral interface, preferably formed into a rectangular cross-section. By optimizing the structure in this way, the weight of the third mounting portion 3 can be reduced, and the center of mass of the portion balancing the inertia force is moved toward the direction of the shaft hole, thereby reducing the rotation area of ​​the fan-shaped surface of the third mounting portion 3, providing a larger design space for the miniaturization design of the air compressor.

[0059] See also Figure 4cIn this embodiment, preferably, the third mounting portion 3 is cut and reduced along a straight line perpendicular to the midline of the sector surface to form Figure 4a In this case, the eccentric wheel rotates around the central axis of the second through hole 212 when in use. Since the center of the fan-shaped disc structure of the third mounting portion 3 is located on the side of the central axis of the second through hole 212 close to the third mounting portion 3, Figure 4c The solid circle on the outside is the eccentric wheel rotation area X1 that has not been cut off and reduced, and the dotted circle on the inside is the eccentric wheel rotation area X2 after the cut off in this embodiment. By comparison, it can be seen that the eccentric wheel provided in this embodiment can further reduce the occupied space when the eccentric wheel rotates by reducing the third mounting portion 3 by 1, and the rotation area is significantly reduced, which can avoid interference with other parts and provide design space for the miniaturization design of the air compressor.

[0060] FIG5 is a schematic diagram of the optimized eccentric wheel structure of another embodiment of the present invention. Figure 5a This is a schematic diagram of the optimized eccentric wheel. Figure 5b It is a cross-sectional schematic diagram of the eccentric wheel after optimization.

[0061] like Figure 5a , Figure 5b As shown, similar to the aforementioned embodiments, the eccentric wheel provided in this embodiment includes a first mounting portion 1, a second mounting portion 2 and a third mounting portion 3.

[0062] The difference is that, in this embodiment, a mounting groove is provided on the third mounting portion 3, a counterweight 31 is provided in the mounting groove, and the material density of the counterweight 31 is preferably greater than the material density of the third mounting portion 3. Specifically, the mounting groove can be provided on the side of the third mounting portion 3 away from the first mounting portion 1, so that the deflection moment formed is greater. The shape of the mounting groove can be arc-shaped or annular, and is evenly arranged along the circumference of the third mounting portion 3 to enhance the balance of the eccentric wheel, and the shape of the counterweight 31 matches the mounting groove.

[0063] In this embodiment, a counterweight is added to the eccentric wheel on the side of the third mounting portion 3 away from the first mounting portion 1, which can further move the center of gravity of the eccentric wheel to the side of the third mounting portion 3, thereby increasing the inertia force of the eccentric wheel. In this way, a larger deflection inertia force can be obtained without increasing the overall size of the eccentric wheel, and a larger rotational inertia force can be balanced with a minimum eccentric wheel size.

[0064] In this embodiment, the counterweight 31 can be a material with higher density and heavier unit mass, such as a lead block, and the mass of the third part can be increased without changing the shape. If the inertia force to be balanced remains unchanged, the rotation radius R of the counterweight part can be further reduced. If a lead block is used, the rotation radius R can be further reduced by about 21%. In this way, while maintaining the original rotation inertia force, the size of the eccentric wheel can be designed to be smaller and its rotation area can be reduced, which is conducive to making the overall design of the air compressor more miniaturized and compact.

[0065] FIG6 is a schematic diagram of the structure of an optimized rear eccentric wheel according to another optional embodiment of the present application. Figure 6a A schematic diagram showing the structure of a fourth through hole arranged inside the third mounting portion 3, Figure 6b A schematic structural diagram showing that fourth through holes are arranged on both sides of the second mounting portion.

[0066] As shown in FIG. 6 , similar to the aforementioned embodiments, the eccentric wheel provided in this embodiment includes a first mounting portion 1 , a second mounting portion 2 and a third mounting portion 3 .

[0067] The difference is that, in this embodiment, there is no third through hole 211 on the upper part of the second mounting part 2. On the contrary, a fourth through hole 311 is provided inside the third mounting part 3 or on both sides or either side of the second mounting part 2, which is perpendicular to the axis of the second through hole 212, and the fourth through hole 311 is connected to the second through hole 212. The fourth through hole 311 is preferably formed as a threaded hole for installing a fastening screw to fasten the second mounting part 2 or the third mounting part 3 to the rotor shaft. In this case, the reduced portion of the second mounting part 2 located at the upper part of the second through hole 212 can be larger. For example, in the case where the fourth through hole 311 is provided on both sides or either side of the second mounting part 2, the second mounting part 2 can be reduced to a thickness of 1-8 thread lengths; in the case where the fourth through hole 311 is provided inside the third mounting part 3, the second mounting part 2 can be reduced to a thickness of 1-10 thread lengths, and in both cases, the thickness is reduced to a minimum of 1 thread length. Finally, the rotation radius R of the eccentric wheel after reduction can be reduced by about 26%, and the weight of the eccentric wheel can be reduced by about 17%.

[0068] As described above, the above-mentioned various embodiments of the present invention optimize the eccentric wheel structure from multiple angles, including reducing at least a portion of the upper area of ​​the second mounting portion, proportionally reducing the third mounting portion, cutting and reducing at least a portion of the outer area of ​​the third mounting portion, arranging a counterweight block on the third mounting portion, and arranging a fourth through hole 311 perpendicular to the axis of the second through hole 212 inside the third mounting portion 3 or on both sides or either side of the second mounting portion. Obviously, the implementation of the present invention is not limited to any one of the structures, but can be implemented independently according to actual design needs, or any two, three or four of the above-mentioned optimized design structures can be combined, as long as the weight of the eccentric wheel can be ultimately reduced, the space it occupies can be reduced, and the rotation amplitude can be maintained at a low level.

[0069] The present invention also provides an air compressor, including a motor and a cylinder, having an eccentric wheel structure as described in the above embodiments, wherein the eccentric wheel structure can be fixedly mounted on the rotor shaft 5 of the motor, wherein the first mounting portion 1 is movably connected to the connecting rod 4, and the connecting rod 4 and the piston of the cylinder are driven by the motor to work. When the eccentric wheel structure is installed in the air compressor, the rotor shaft 5 in the air compressor passes through the second through hole 212 and the first through hole 11 in the eccentric wheel structure, and the eccentric wheel structure is fixed on the rotor shaft 5 by using a fastener to be installed in the third through hole 211; the bearing is installed in conjunction with the first mounting portion 1, and the connecting rod 4 is assembled on the bearing.

[0070] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. An eccentric wheel structure, characterized in that: include: The first mounting portion (1) is formed in a circular shape, and a first through hole (11) is provided at a position deviating from the center of the circle, for fixedly connecting the rotor shaft or the output shaft driven by the rotor shaft; A second mounting portion (2), wherein a second through hole (212) is arranged inside the second mounting portion (212) which is axially aligned with and connected to the first through hole (11), one end of the second mounting portion (212) being fixedly connected to the first mounting portion (1) along the axial direction of the rotor shaft, and the other end of the second mounting portion (212) being fixedly connected to the third mounting portion (3) along the radial direction of the rotor shaft or being integrally formed with the third mounting portion (3); A third mounting portion (3) is formed in a fan-shaped ring shape and is used for the counterweight portion of the eccentric wheel structure; The projection area of ​​the second mounting portion (2) is located below the first mounting portion (1), and its projection area is 60%-80% of the area of ​​the first mounting portion (1).

2. The eccentric wheel structure according to claim 1, characterized in that: The outer diameter of the second mounting portion (2) is greater than or equal to 1 / 4 of the outer diameter of the first mounting portion (1), and less than or equal to 4 / 5 of the outer diameter of the first mounting portion (1).

3. The eccentric wheel structure according to claim 1 or 2, characterized in that: The upper portion of the second mounting portion (2) is provided with a third through hole (211) vertically connected to the second through hole (212); The portion of the second mounting portion (2) located above the second through hole (212) is set to have a minimum thread length for screw mounting.

4. The eccentric wheel structure according to claim 1 or 2, characterized in that: Fourth through holes (311) vertically connected to the second through hole (212) are provided on both sides or on either side of the second mounting portion (2); The portion of the second mounting portion (2) located above the second through hole (212) is set to have a thread length of 1 to 8.

5. The eccentric wheel structure according to claim 1 or 2, characterized in that: A fourth through hole (311) vertically connected to the second through hole (212) is provided inside the third mounting portion (3); The portion of the second mounting portion (2) located above the second through hole (212) is set to have a thread length of 1-10.

6. The eccentric wheel structure according to any one of claims 1 to 5, characterized in that: The third mounting portion (3) is proportionally reduced, so that the rotation radius of the eccentric wheel is reduced to 10%-23%.

7. The eccentric wheel structure according to any one of claims 1 to 5, characterized in that: One end of the third mounting portion (3) away from the second mounting portion (2) is at least partially reduced, so that the rotational inertia force formed by the reduced portion is substantially equal to the rotational inertia force formed by the reduced area of ​​the second mounting portion (2).

8. The eccentric wheel structure according to claim 7, characterized in that: The outer diameter of an end of the third mounting portion (3) away from the second mounting portion (2) is reduced by 1 / 4 to 1 / 2.

9. The eccentric wheel structure according to any one of claims 1 to 8, characterized in that: The third mounting portion (3) is provided with a counterweight block (31) having a material density greater than that of the third mounting portion (3).

10. An air compressor, characterized in that: include: A motor and a cylinder, and an eccentric wheel structure as described in any one of claims 1 to 9.

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