Eccentric bearings and reciprocating air compressors

Abstract

This application relates to the field of air compressors, specifically an eccentric bearing and a reciprocating air compressor. The eccentric bearing includes an inner ring and an outer ring that are coaxial and rotatably connected. An eccentric hole, penetrating the inner ring and eccentrically positioned thereoff, is provided on the inner ring for mounting the rotating shaft. At least two keyway grooves, which mate with the shaft key, are provided on the inner peripheral wall of the eccentric hole. The two ends of the keyway grooves extend to opposite sides of the inner ring, allowing the shaft key to penetrate the inner ring and slide along its axial direction. The eccentric bearing provided in this application, on the one hand, uses an eccentric bearing instead of a traditional eccentric wheel as the driving medium, improving driving efficiency; on the other hand, the keyway grooves within the eccentric hole penetrate the eccentric bearing, allowing for a sliding fit between the eccentric bearing and the rotating shaft. During installation, its axial position can be adjusted, facilitating assembly and disassembly of the eccentric bearing, thus improving assembly and disassembly efficiency.

Description

Technical Field

[0001] This application relates to the field of air compressors, specifically to an eccentric bearing and a reciprocating air compressor. Background Technology

[0002] Bearings are important components of the transmission mechanism in reciprocating air compressors. Traditionally, bearings are mainly used for support.

[0003] Traditional reciprocating air compressors have a crank-cam mechanism, which uses an eccentric wheel on the outside of the crank to drive the piston in reciprocating motion. The crank-cam mechanism has a bearing on the outside of the crank, and the bearing is fixedly connected to the crank by a key pin, which is not conducive to the disassembly and assembly of the crank-cam mechanism. Utility Model Content

[0004] To solve, or at least partially solve, the aforementioned technical problems, this application provides an eccentric bearing, which cooperates with a rotating shaft for use in a reciprocating air compressor, comprising:

[0005] The bearing body includes an inner ring and an outer ring that are coaxial and rotatably connected;

[0006] An eccentric hole is provided on the inner ring, which passes through the inner ring and is eccentrically disposed with respect to the inner ring. The eccentric hole is used to install the rotating shaft.

[0007] At least two key slots are provided on the inner peripheral wall of the eccentric hole to mate with the key of the rotating shaft. The two ends of the key slots extend to the opposite two sides of the inner ring, so that the key passes through the inner ring and can slide along the axial direction of the inner ring.

[0008] Optionally, the plurality of key slots are arranged in a centrally symmetrical manner, wherein the axis of symmetry of the central symmetry is the central axis of the eccentric hole.

[0009] Optionally, the number of key slots is three, and the three key slots are evenly distributed around the circumference of the eccentric hole.

[0010] Optionally, at least one keyway is located at the position furthest from the outer ring on the inner peripheral wall of the eccentric hole.

[0011] Optionally, the keyway includes a first inner wall and a second inner wall disposed opposite to each other, and a third inner wall connecting the first inner wall and the second inner wall, wherein the first inner wall and the second inner wall are both planar, and the third inner wall is an arc surface.

[0012] Optionally, the first inner wall and the second inner wall are respectively used for interference fit with the key, so that the key slides in contact with the first inner wall and the second inner wall respectively, and the third inner wall at least partially abuts the key to provide resistance to the sliding of the key.

[0013] Optionally, the bearing body has mating grooves on its opposite two sides along its axial direction, and a cover plate is provided in the mating groove.

[0014] Optionally, the mating groove is an annular groove formed by the inner ring and the outer ring, the annular groove is located outside the eccentric hole, and the annular groove is coaxially arranged with the inner ring.

[0015] Optionally, the outer ring has a positioning groove on its circumferential surface, and a positioning ring is engaged in the positioning groove, the positioning ring protruding from the circumferential surface of the outer ring.

[0016] This application provides a reciprocating air compressor, comprising:

[0017] A rotating shaft, one end of which is connected to a drive motor;

[0018] At least one eccentric bearing as described above, wherein a piston mechanism is externally fitted onto the eccentric bearing;

[0019] The eccentric bearing is sleeved on the rotating shaft and slides in cooperation with the rotating shaft;

[0020] Driven by the drive motor, the rotating shaft cooperates with the eccentric bearing to convert the rotational motion into the reciprocating motion of the piston mechanism.

[0021] The eccentric bearing provided in this application improves driving efficiency by replacing the traditional eccentric wheel with an eccentric bearing as the driving medium. On the other hand, the keyway in the eccentric hole runs through the eccentric bearing, allowing for a sliding fit between the eccentric bearing and the shaft. During installation, its axial position can be adjusted, which facilitates the assembly and disassembly of the eccentric bearing, thus improving the efficiency of assembly and disassembly.

[0022] The reciprocating air compressor provided in this application, due to the installation of the aforementioned eccentric bearing, also possesses all the advantages described above. Attached Figure Description

[0023] To more clearly illustrate the embodiments of this application, the relevant drawings will be briefly described below. It is understood that the drawings described below are only for illustrating some embodiments of this application, and those skilled in the art can obtain many other technical features and connections not mentioned herein based on these drawings.

[0024] Figure 1 This is a schematic diagram of the eccentric bearing of this application;

[0025] Figure 2 This is a front view schematic diagram of the eccentric bearing of this application;

[0026] Figure 3 This is a side view of the eccentric bearing of this application.

[0027] Explanation of reference numerals in the attached figures:

[0028] 100. Inner ring; 110. Eccentric hole; 120. Keyway; 121. First inner wall; 122. Second inner wall; 123. Third inner wall;

[0029] 200. Outer ring;

[0030] 300. Cover plate; 310. Mating groove;

[0031] 400. Positioning ring; 410. Positioning groove;

[0032] 500, ball bearing; 600, ball bearing support. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0034] In the description of the embodiments of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0035] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model based on the specific circumstances.

[0036] The technical solutions in the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0037] Example 1

[0038] like Figures 1 to 3 As shown, this embodiment provides an eccentric bearing, including a bearing body, which is composed of an inner ring 100 and an outer ring 200. The outer ring 200 is sleeved outside the inner ring 100, and the inner ring 100 and the outer ring 200 are coaxially arranged and can rotate relative to each other.

[0039] like Figure 3 As shown, a plurality of balls 500 are provided between the inner ring 100 and the outer ring 200. The balls 500 are held in a predetermined position by the ball support 600 between the inner ring 100 and the outer ring 200 to prevent the balls 500 from falling off. The inner ring 100 and the outer ring 200 can rotate relative to each other through the balls 500.

[0040] In this embodiment, an eccentric hole 110 is provided on the inner ring 100, which passes through the inner ring 100 and is eccentrically disposed with respect to the inner ring 100. The eccentric hole 110 is used to install the rotating shaft.

[0041] The eccentric setting mentioned in this embodiment can be understood as follows: the central axis of the inner ring 100 is tangential to but does not coincide with the central axis of the eccentric hole 110, and the eccentric hole 110 is set on the side closer to the inner ring 100. In this way, the rotating shaft extends into the eccentric hole 110 and connects with the eccentric bearing. The rotation of the rotating shaft also drives the eccentric bearing to rotate. Due to the setting of the eccentric hole 110, the inner ring 100 drives the outer ring 200 to move, realizing the conversion of rotational motion into reciprocating motion.

[0042] like Figure 1 and Figure 2 As shown, at least two key slots 120 are provided on the inner peripheral wall of the eccentric hole 110 to cooperate with the key of the rotating shaft. The two ends of the key slots 120 extend to the opposite side surfaces of the inner ring 100, so that the key passes through the inner ring 100 and can slide along the axial direction of the inner ring 100.

[0043] In this embodiment, the rotating shaft is fitted with an eccentric bearing, and the eccentric bearing has an eccentric hole 110 in the middle that mates with the rotating shaft. The outer ring 200 of the eccentric bearing abuts against the piston mechanism.

[0044] Traditional reciprocating air compressors use a crank-cam mechanism, which includes a rotating shaft, a crank, eccentric wheels, and bearings. The crank is sleeved on the outside of the rotating shaft, and two bearings are set on opposite sides of the crank. Multiple eccentric wheels are set between the two bearings. The rotation of the rotating shaft drives the eccentric wheels to rotate. The eccentric wheels abut against the piston rod, and the rotation of the eccentric wheels drives the piston rod to reciprocate. In this way, the rotational motion of the rotating shaft can be changed into the linear reciprocating motion of the piston rod.

[0045] Compared to existing technologies, this application does not use an eccentric wheel, but instead uses an eccentric bearing. The eccentric bearing is sleeved on the outside of the rotating shaft, and its eccentric arrangement drives the piston mechanism to reciprocate. In this embodiment, the piston mechanism is coaxially arranged with the air compressor cylinder, eliminating the need for lateral oscillation and allowing it to move continuously along the cylinder's axial direction. Therefore, the piston rod exerts only a stable axial force on the piston, preventing lateral forces from pressing against the inner wall of the cylinder, thus reducing wear between the piston and the cylinder and improving the air compressor's operational stability and service life.

[0046] Moreover, compared with the traditional eccentric wheel drive method, the overall structure of the eccentric bearing in this embodiment is simpler. On the one hand, it reduces production costs. On the other hand, during assembly, the eccentric bearing can be first fitted onto the predetermined position of the rotating shaft. After the position is adjusted or after other equipment is installed, the eccentric bearing can be slid on the rotating shaft to fine-tune its position, so that the eccentric bearing reaches the ideal position for installation. This reduces the difficulty of disassembling and assembling the eccentric bearing and improves the efficiency of disassembly and assembly.

[0047] Furthermore, the keyway 120 provided in the eccentric bore 110 of the eccentric bearing extends through the eccentric bearing, thereby enabling a sliding fit between the shaft and the eccentric bearing. During the installation of the eccentric bearing, the installation position of the eccentric bearing is adjustable, which facilitates the relative adjustment of the positions of other structures installed on the shaft after the eccentric bearing is installed, thus improving the adjustment flexibility of the eccentric bearing.

[0048] For example, if there is more than one eccentric bearing on the shaft and the positions of the different eccentric bearings are relatively fixed, all the eccentric bearings can be put on the shaft first, and then their positions can be finely adjusted to further limit the position. In this way, the disassembly and assembly efficiency of the eccentric bearings in this embodiment is higher and the flexibility of use is greater.

[0049] Please refer to Figure 1 and Figure 2 In one embodiment, the number of key slots 120 is at least three, and the at least three key slots 120 are evenly distributed around the circumference of the eccentric hole 110.

[0050] This embodiment uses three keyway slots 120 as an example for illustration. Traditionally, the connection between the shaft and the bearing is a non-through connection method. For example, a non-through slot is opened along the wall of the hole in the middle of the bearing. During the installation of the bearing, it is engaged with the shaft by a key pin, and after the engagement is completed, their relative positions are determined and cannot be changed.

[0051] Because traditional rotating shafts and bearings are connected by only one key pin, after prolonged use, stress concentration at the key pin can cause stress torsion on the shaft itself, which is detrimental to the service life of the shaft.

[0052] Based on this, the present application provides three key slots 120 in the eccentric hole 110, which are evenly distributed around the circumference of the eccentric hole 110. This avoids the defect of stress concentration during operation of the shaft and the eccentric bearing, improves the service life of the shaft and the eccentric bearing, and thus improves the operational stability of the eccentric bearing.

[0053] Specifically, the rotating shaft is provided with a mating protrusion that matches the keyway 120. The mating protrusion is the shaft key on the rotating shaft. The mating protrusion is embedded in the keyway 120 and slides in axial direction with the eccentric bearing.

[0054] Traditionally, the shaft and bearing are positioned by key pins. For example, a key groove 120 is opened inside the middle hole of the bearing, and then the shaft and bearing are fixedly connected by key pins inserted into the key groove 120, so that the bearing and shaft move synchronously.

[0055] In this embodiment, a key is provided on the outside of the rotating shaft to mate with the keyway 120. The rotating shaft and the eccentric bearing are connected by the key and the keyway 120. The rotating shaft transmits rotational force to the eccentric bearing through the engagement of the key and the keyway 120. Then, other positioning elements are used to further limit the eccentric bearing's position in the axial direction of the rotating shaft. Thus, the installation of the eccentric bearing is divided into two steps: the first step is pre-installation, which involves fitting the eccentric bearing onto the rotating shaft; the second step is after the other structures are installed, at which point the position of the eccentric bearing can be determined. By limiting its position through positioning elements, the flexibility of eccentric bearing assembly and disassembly is improved.

[0056] The eccentric bearing in this embodiment includes an inner ring 100 and an outer ring 200. The inner ring 100 is engaged with the rotating shaft through an eccentric hole 110, and the outer ring 200 is connected to the piston mechanism.

[0057] That is, the eccentric hole 110 is opened in the inner ring 100, and the inner ring 100 and the outer ring 200 are engaged by multiple ball bearings 500.

[0058] The rotation of the shaft will drive the inner ring 100 to rotate, and the rotation of the inner ring 100 will drive the outer ring 200 to rotate eccentrically. During the rotation of the outer ring 200, it will press against the piston mechanism to reciprocate.

[0059] The eccentric bearing slides along the shaft axis, allowing it to be pre-installed during installation and then positioned using other fasteners.

[0060] Traditional bearings and shafts are fixedly connected by key pins. On the one hand, this causes stress concentration and the shaft to easily twist, affecting its service life. On the other hand, it is not conducive to the disassembly and assembly of bearings, making disassembly and assembly difficult and thus reducing the efficiency of disassembly and assembly of eccentric bearings.

[0061] like Figure 2 As shown, in one embodiment, one of the three key slots 120 is located at the position furthest from the outer ring 200 on the inner peripheral wall of the eccentric hole 110, which is also the thickest position on the inner ring 100, to ensure the structural strength of the inner ring 100. In short, key slots 120 should be avoided as much as possible from being located at the thinnest position on the inner ring 100 to prevent the inner ring 100 from being damaged due to excessive force.

[0062] like Figure 2 As shown, in one embodiment, the keyway 120 includes a first inner wall 121 and a second inner wall 122 disposed opposite to each other, and a third inner wall 123 connecting the first inner wall 121 and the second inner wall 122. The first inner wall 121 and the second inner wall 122 are both planar, and the third inner wall 123 can be a planar surface or an arc surface.

[0063] The first inner wall 121 and the second inner wall 122 are both flat and need to be able to slide with the key on the rotating shaft. The third inner wall 123 can also slide with the key on the rotating shaft and can also maintain a certain gap.

[0064] In this embodiment, the first inner wall 121 and the second inner wall 122 are respectively used for interference fit with the shaft key, so that the shaft key slides in contact with the first inner wall 121 and the second inner wall 122 respectively. In order to prevent the sliding fit between the eccentric bearing and the shaft key from being too sensitive and the resistance being too small, resulting in instability of the eccentric bearing, the third inner wall 123 at least partially abuts against the shaft key to provide resistance for the sliding of the shaft key.

[0065] like Figure 2 and Figure 3 As shown, the bearing body has mating grooves 310 on opposite sides along its axial direction, and a cover plate 300 is installed inside the mating grooves 310. The mating groove 310 is an annular groove formed by the inner ring 100 and the outer ring 200. The annular groove is located outside the eccentric hole 110 and is coaxial with the inner ring 100. The mating groove 310 corresponds to the position of the ball 500 and is used to install the ball 500. The cover plate 300 is used to cover the mating groove 310 and seal the ball 500 to prevent dust.

[0066] In one embodiment, such as Figure 2 and Figure 3 As shown, a positioning groove 410 is provided on the circumferential surface of the outer ring 200, and a positioning ring 400 is engaged in the positioning groove 410, with the positioning ring 400 protruding from the circumferential surface of the outer ring 200. The positioning ring 400 is an annular component, which can limit the structure mounted on the surface of the outer ring 200.

[0067] Specifically, the positioning groove 410 and the positioning ring 400 are set on one edge of the outer ring 200 to reserve installation space on the surface of the outer ring 200.

[0068] In some embodiments, the aforementioned mating groove 310 can also serve as a positioning groove, and the cover plate 300 can be replaced by a positioning element to achieve the limiting effect on the eccentric bearing.

[0069] For example, in one embodiment, the eccentric bearing has a mating groove 310 on each of its opposite sides along its axial direction, and one end of the positioning member is embedded in the mating groove 310.

[0070] That is, the positioning element is located on the outer ring 200 of the eccentric bearing to limit the position of the eccentric bearing along the axis of rotation. This embodiment improves the assembly and disassembly efficiency of the eccentric bearing by positioning the eccentric bearing with the positioning element.

[0071] Alternatively, in some other embodiments, other structures may be used to limit the position of the eccentric bearing, which are not limited here.

[0072] Example 2

[0073] This embodiment provides a reciprocating air compressor, which includes a drive motor, a rotating shaft, and a piston mechanism. Specifically, one end of the rotating shaft is connected to the drive motor; at least one eccentric bearing as described in the above embodiment is sleeved on the rotating shaft, and the piston mechanism is sleeved outside the eccentric bearing.

[0074] An eccentric bearing is fitted onto the rotating shaft and slides in contact with it. Driven by a drive motor, the rotating shaft, in conjunction with the eccentric bearing, converts the rotational motion into the reciprocating motion of the piston mechanism.

[0075] A reciprocating air compressor includes a compression cylinder and a piston inside the compression cylinder. The piston moves within the compression cylinder to achieve normal operation of the air compressor. The operation of the compression mechanism of the reciprocating air compressor is common knowledge in the field and will not be described in this embodiment.

[0076] The reciprocating air compressor in this embodiment is equipped with the eccentric bearing mentioned in the above embodiment. The outer ring 200 of the eccentric bearing abuts against the piston rod, thereby driving the piston to reciprocate.

[0077] As can be seen, the reciprocating air compressor in this embodiment also has an air tank and a unit base (not shown in the figure). The air tank is connected to the compression cylinder and is used to store compressed air. The unit base is used to install and fix the compression mechanism, the eccentric bearing and the air tank.

[0078] The reciprocating air compressor provided in this embodiment has the eccentric bearing mentioned in the above embodiment, so this embodiment also has all the advantages mentioned above, and will not be repeated here.

[0079] In this embodiment of the utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0080] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0081] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. An eccentric bearing, used in conjunction with a rotating shaft in a reciprocating air compressor, characterized in that, include: The bearing body includes an inner ring (100) and an outer ring (200) that are coaxial and rotatably connected; An eccentric hole (110) is provided on the inner ring (100) through the inner ring (100) and eccentrically disposed with respect to the inner ring (100). The eccentric hole (110) is used to install the rotating shaft. At least two key slots (120) are provided on the inner peripheral wall of the eccentric hole (110) to cooperate with the key of the rotating shaft. The two ends of the key slots (120) extend to the opposite side surfaces of the inner ring (100) so that the key passes through the inner ring (100) and can slide along the axial direction of the inner ring (100).

2. The eccentric bearing according to claim 1, characterized in that, The multiple keyway slots (120) are arranged in a centrally symmetrical manner, and the axis of symmetry of the central symmetry is the central axis of the eccentric hole (110).

3. The eccentric bearing according to claim 2, characterized in that, The number of key slots (120) is three, and the three key slots (120) are evenly distributed around the eccentric hole (110) in a circumferential direction.

4. The eccentric bearing according to claim 1, characterized in that, At least one keyway (120) is located at the position furthest from the outer ring (200) on the inner peripheral wall of the eccentric hole (110).

5. The eccentric bearing according to claim 1, characterized in that, The keyway (120) includes a first inner wall (121) and a second inner wall (122) disposed opposite to each other, and a third inner wall (123) connecting the first inner wall (121) and the second inner wall (122). The first inner wall (121) and the second inner wall (122) are both planar, and the third inner wall (123) is an arc surface.

6. The eccentric bearing according to claim 5, characterized in that, The first inner wall (121) and the second inner wall (122) are respectively used to interfere with the key so that the key slides in contact with the first inner wall (121) and the second inner wall (122) respectively, and the third inner wall (123) at least partially abuts the key to provide resistance to the sliding of the key.

7. The eccentric bearing according to any one of claims 1 to 6, characterized in that, The bearing body has mating grooves (310) on its opposite two sides along its axial direction, and a cover plate (300) is provided in the mating groove (310).

8. The eccentric bearing according to claim 7, characterized in that, The mating groove (310) is an annular groove formed by the inner ring (100) and the outer ring (200). The annular groove is located outside the eccentric hole (110) and is coaxially arranged with the inner ring (100).

9. The eccentric bearing according to any one of claims 1 to 6, characterized in that, The outer ring (200) has a positioning groove (410) on its circumferential surface. A positioning ring (400) is engaged in the positioning groove (410) and protrudes from the circumferential surface of the outer ring (200).

10. A reciprocating air compressor, characterized in that, include: A rotating shaft, one end of which is connected to a drive motor; At least one eccentric bearing as described in any one of claims 1 to 9, wherein a piston mechanism is externally fitted onto the eccentric bearing; The eccentric bearing is sleeved on the rotating shaft and slides in cooperation with the rotating shaft; Driven by the drive motor, the rotating shaft cooperates with the eccentric bearing to convert the rotational motion into the reciprocating motion of the piston mechanism.

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