Eccentric wheel structure and air compressor

Abstract

The utility model relates to the technical field of air compressors, in particular to an eccentric wheel structure and an air compressor. The eccentric wheel structure comprises a first mounting part (1), the interior of the first mounting part is fixedly connected to a rotor shaft (5), the exterior is movably connected with a connecting rod (4), and the connecting rod (4) is driven by the rotor shaft (5) to reciprocate; one end of the second mounting part (2) is fixedly connected with the first mounting part (1) along the axis direction of the rotor shaft (5), and the other end of the second mounting part (2) is fixedly connected with the third mounting part (3) along the radial direction of the rotor shaft (5); and the third mounting part (3) forms a sector ring shape and is used for a counterweight part of the eccentric wheel structure. The eccentric wheel is reasonable in structure, materials used for the second installation part (2) are reduced, the gravity center of the third installation part (3) serving as a balance weight part is moved downwards, and therefore the materials are reduced on the premise that original inertia force is kept unchanged.

Description

TECHNICAL FIELD

[0001] The utility model relates to air compressor technical field, concretely relates to an eccentric wheel structure and air compressor. BACKGROUND

[0002] The oil -free air compressor for oxygen generator on market at present mainly divides into two kinds, one oil -free air compressor has connecting rod part, eccentric wheel, rotor bearing, eccentric wheel bearing, when the oil -free air compressor is at work, connecting rod part, eccentric wheel, rotor bearing, eccentric wheel bearing high -speed rotation. The eccentric wheel rotation of commonly seen oil -free air compressor drives the reciprocating motion of connecting rod, the connecting rod is under greater stress in the process of compression, and under smaller stress when returning, and the eccentric wheel structure needs to increase counterweight to make it run stably, but the existing counterweight is mostly circular and has larger mass, needs to use more raw materials to produce, greatly increases production cost. SUMMARY

[0003] The utility model aims at the problems in the background art, and provides an eccentric wheel structure and air compressor.

[0004] The technical scheme of the utility model relates to an eccentric wheel structure, which comprises:

[0005] A first mounting portion is fixedly connected to a rotor shaft inside and movably connected to a connecting rod outside, and drives the connecting rod to reciprocate under the driving of the rotor shaft;

[0006] A second mounting portion is fixedly connected to the first mounting portion along the axial direction of the rotor shaft at one end and fixedly connected to a third mounting portion along the radial direction of the rotor shaft at the other end;

[0007] The third mounting portion is formed in a fan ring shape and used as a counterweight part of the eccentric wheel structure.

[0008] Further, a first through hole for assembling the rotor shaft is arranged on the first mounting portion, and the central axis of the first through hole does not coincide with the central axis of the first mounting portion.

[0009] Further, a second through hole for assembling the rotor shaft is arranged on the end face of the second mounting portion, the second through hole is communicated with the first through hole, and the central axis of the second through hole coincides with the central axis of the first through hole.

[0010] Further, a third through hole perpendicular to the rotor shaft is arranged on the second mounting portion, and the third through hole penetrates the outer surface of the second mounting portion and the second through hole inside.

[0011] Further, the second mounting portion is formed into a first connecting piece with a circular arc projection shape, and the first connecting piece is fixedly connected to the third mounting portion along the radial direction of the rotor shaft.

[0012] Furthermore, the outer diameter of the first connecting member is smaller than the outer diameter of the first mounting portion.

[0013] Furthermore, the central axis of the first connecting member coincides with the central axis of the first mounting portion, and the first connecting member is connected to the first mounting portion.

[0014] Furthermore, the second mounting portion further includes a second connecting member having a rectangular projection shape, and the second connecting member is fixedly connected between the first connecting member and the third mounting portion, or is integrally formed.

[0015] Furthermore, the second mounting portion and the third mounting portion have the same thickness.

[0016] The utility model also provides an air compressor having the eccentric wheel structure in any of the above technical solutions.

[0017] Compared with the prior art, the above technical solution of the present invention has the following beneficial technical effects:

[0018] The eccentric wheel provided by the utility model has a reasonable structure, reduces the material consumption of the first mounting part and the second mounting part, and moves the center of gravity of the third mounting part serving as the counterweight part downward, thereby reducing the material consumption while maintaining the original inertial force unchanged, and greatly reducing the production cost of the eccentric wheel. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 、 Figure 2 and Figure 3 All of them are three-dimensional diagrams of an embodiment proposed by the utility model.

[0020] Reference numerals:

[0021] 1. First mounting portion; 11. First through hole; 2. Second mounting portion; 21. First connecting member; 22. Second connecting member; 211. Third through hole; 212. Second through hole; 3. Third mounting portion; 4. Connecting rod; 5. Rotor shaft. DETAILED DESCRIPTION

[0022] Example 1

[0023] like Figures 1-3 As shown, the eccentric wheel structure proposed by the present invention includes a first mounting portion 1 , a second mounting portion 2 and a third mounting portion 3 .

[0024] The first mounting portion 1 is internally fixedly connected to the rotor shaft 5 or the output shaft driven by the rotor shaft 5; the outside is movably connected to the connecting rod 4, which drives the connecting rod 4 to reciprocate under the drive of the rotor shaft 5; the rotor shaft 5 is usually the shaft of the motor; preferably, the first mounting portion 1 is rollingly connected to the connecting rod 4, for example, rollingly connected to the bearing hole of the connecting rod, and a bearing shell can be provided between the first mounting portion 1 and the connecting rod 4.

[0025] Second installation part, one end of the rotor shaft 5 along the axis direction fixed connection first installation part 1, the other end along the rotor shaft 5 radial direction fixed connection third installation part 3; preferably, the second installation part 2 compared with the first installation part 1 is located away from the motor housing side.

[0026] Third installation part 3 is formed into a fan ring, for the eccentric structure of the counterweight part. Because the connecting rod 4 one end with the first installation part 1 do circular motion, the other end of the piston do linear motion, the resulting thrust is ultimately on the piston of linear motion, with the connecting rod 4 pole angle changes, the process of motion rotor shaft 5 on the piston torque is always changing, and if the connecting rod piston is used in the cylinder of air compressor, connecting rod 4 and piston in the direction of the compressed air received force is larger, when the force is smaller, so need to carry out counterweight to provide inertia force makes connecting rod 4 and piston output smooth; in addition, the counterweight is also for the influence of connecting rod 4 movement on the rotor shaft 5, therefore, as the third installation part 3 of the counterweight is fan-shaped and only on one side of the second installation part 2, that is, the center of gravity is located outside the rotor shaft 5 axis, the center of gravity down to keep the original inertia force unchanged under the premise of reducing the material, greatly reduces the production cost of the eccentric structure.

[0027] The first installation part 1 is circular in projection shape, and a first through hole 11 is arranged in the thickness direction of the first installation part 1; the central axis of the first through hole 11 and the central axis of the first installation part 1 do not coincide and are parallel to each other, that is, the first installation part 1 is eccentric and moves eccentrically under the driving of the rotor shaft 5 to drive the other end of the connecting rod 4 to move linearly and reciprocally. In the installation state of the first installation part 1 in the air compressor, the first installation part 1 is connected to the bearing or bearing bush through the first through hole 11, and the connecting rod 4 is assembled on the bearing or bearing bush.

[0028] The second installation part 2 and the first installation part 1 are arranged side by side and parallel along the axis direction of the rotor shaft 5, and the second installation part 2 is connected to the first installation part 1. Optionally, the first installation part 1 is fixedly connected or integrally formed with the second installation part 2 to ensure that the rotation movements of the two are synchronous. A second through hole 212 is arranged on the end face of the second installation part 2, the second through hole 212 and the first through hole 11 are communicated to form an assembly hole for the rotor shaft 5 to penetrate to be matched and installed with the rotor shaft 5, and the central axis of the second through hole 212 and the central axis of the first through hole 11 coincide.

[0029] The second installation part 2 is provided with a third through hole 211 penetrating through, such as Figure 1The third through hole 211 is arranged on the side opposite to the third mounting part 3, and the central axis of the third through hole 211 is perpendicular to the central axis of the second through hole 212, and the third through hole 211 is connected by using a fastening part to press the rotor shaft 5, so that a fixed structure is formed, and the first mounting part 1 and the second mounting part 2 can be driven to perform eccentric motion when the rotor shaft 5 rotates. Preferably, the third through hole 211 is a threaded hole, that is, an internal thread is arranged on the inner wall of the third through hole 211, so that a threaded fastener can be fixed therein.

[0030] The third mounting part 3 is connected to the side end face of the second mounting part 2, and the third mounting part 3 is used as a counterweight part of the eccentric wheel structure and plays a counterweight role in eccentric rotation.

[0031] Embodiment two

[0032] As Figures 1-2 shown, the utility model discloses an eccentric wheel structure, compared with embodiment one, the structure of the second mounting part 2 is recorded in detail in this embodiment.

[0033] In an optional embodiment, the second mounting part 2 is formed as a first connecting piece 21 with a circular arc projection shape. Preferably, the projection shape of the first connecting piece 21 is a semicircle, and the outer diameter value of the first connecting piece 21 is less than the outer diameter value of the first mounting part 1. In this way, the weight of the first connecting piece 21 weakens the counterweight effect of the third mounting part 3 as a counterweight part as little as possible, and the weight and volume of the entire eccentric wheel can be reduced as much as possible. Of course, the present patent is not limited to this. When the weight and volume of the eccentric wheel are large enough, the outer diameter value of the first connecting piece 21 can be greater than or equal to the outer diameter value of the first mounting part 1. In this way, the larger first connecting piece 21 does not significantly weaken the counterweight effect of the third mounting part 3.

[0034] Preferably, the central axis of the circular arc segment of the first connecting piece 21 coincides with the central axis of the first mounting part 1, and the first connecting piece 21 is fixedly connected to the first mounting part 1 or is integrally formed with the first mounting part 1. The third through hole 211 is arranged on the first connecting piece 21, and the third through hole 211 is arranged as a threaded hole for mounting a fastening screw to tightly press against the rotor shaft 5, thereby completing the fastening assembly of the first connecting piece 21 and the rotor shaft 5 bearing.

[0035] In another preferred embodiment, the second mounting part 2 is formed to include a first connecting piece 21 and a second connecting piece 22. The shape of the first connecting piece 21 is as described above. One end of the second connecting piece 22 is connected to the horizontal outer end face of the first connecting piece 21, and the other end of the second connecting piece 22 is connected to the third mounting part 3.

[0036] In an alternative embodiment, the projection shape of the second connecting piece 22 is a rectangle with a certain width, and optionally, the length of the rectangle is consistent with the diameter of the circular arc of the first connecting piece 21, and the width is greater than or equal to the diameter of the second through hole 212. The second connecting piece 22 is fixedly connected between the first connecting piece 21 and the third mounting portion 3, or is integrally formed. The thicknesses of the second mounting portion 2 and the third mounting portion 3 are the same, that is, the thicknesses of the first connecting piece 21, the second connecting piece 22 and the third mounting portion 3 are the same. The projection shape of the third mounting portion 3 is a sector ring shape, that is, a sector face or a circular arc face, so that the center of mass of the counterweight portion is farther away from the rotation center, and the relative rotational inertia force is also greater. The length value of the end face of the second connecting piece 22 connected with the first connecting piece 21 is the same as the length value of the horizontal side end face of the first connecting piece 21. The length value of the end face of the second connecting piece 22 connected with the first connecting piece 21 is the same as the length value of the end face of the third mounting portion 3 connected with the second connecting piece 22. The side end faces of the second connecting piece 22 and the third mounting portion 3 are connected in a circular arc transition manner.

[0037] In the embodiment, by arranging the second connecting piece 22 with a certain thickness between the first connecting piece 21 and the third mounting portion 3, the connection strength between the first connecting piece 21 and the third mounting portion 3 is further strengthened, so that the risk of fracture of the eccentric wheel is greatly reduced when the centrifugal force is generated by high-speed rotation of the eccentric wheel.

[0038] Embodiment three

[0039] The air compressor provided by the utility model, comprising a motor and a cylinder, has the eccentric wheel structure recorded in embodiment one or embodiment two, the eccentric wheel structure can be fixedly installed on the rotor shaft 5 of the motor, wherein the first mounting portion 1 is movably connected with the connecting rod 4, and drives the connecting rod 4 and the piston of the cylinder under the driving of the motor. When the eccentric wheel structure is installed in the air compressor, the rotor shaft 5 in the air compressor penetrates 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 fastening piece to cooperate with installation in the third through hole 211; the bearing is cooperatively installed with the first mounting portion 1, and the connecting rod 4 is assembled on the bearing.

[0040] The embodiments of the utility model are described in detail above in combination with the drawings, but the utility model is not limited to this, and various changes can be made within the knowledge range possessed by the person skilled in the art without departing from the purpose of the utility model.

Claims

1. An eccentric wheel structure, characterized in that: include: A first mounting portion (1) is internally fixedly connected to the rotor shaft (5) and externally movably connected to a connecting rod (4), and is driven by the rotor shaft (5) to drive the connecting rod (4) to reciprocate; A second mounting portion (2), one end of which is fixedly connected to the first mounting portion (1) along the axial direction of the rotor shaft (5), and the other end of which is fixedly connected to the third mounting portion (3) along the radial direction of the rotor shaft (5); The third mounting portion (3) is formed in a fan-shaped ring shape and is used for the counterweight portion of the eccentric wheel structure.

2. The eccentric wheel structure according to claim 1, characterized in that: The first mounting portion (1) is provided with a first through hole (11) for assembling the rotor shaft (5), and the central axis of the first through hole (11) does not coincide with the central axis of the first mounting portion (1).

3. The eccentric wheel structure according to claim 2, characterized in that: A second through hole (212) for assembling the rotor shaft (5) is provided on the end surface of the second mounting portion (2); the second through hole (212) is connected to the first through hole (11), and the central axis of the second through hole (212) coincides with the central axis of the first through hole (11).

4. The eccentric wheel structure according to claim 3, characterized in that: The second mounting portion (2) is provided with a third through hole (211) perpendicular to the rotor axis (5), and the third through hole (211) passes through the outer surface of the second mounting portion (2) and the second through hole (212) inside the second mounting portion (2).

5. The eccentric wheel structure according to any one of claims 1 to 4, characterized in that: The second mounting portion (2) is formed as a first connecting member (21) having a projected arc shape, and the first connecting member (21) is fixedly connected to the third mounting portion (3) along the radial direction of the rotor shaft (5).

6. The eccentric wheel structure according to claim 5, characterized in that: The outer diameter of the first connecting member (21) is smaller than the outer diameter of the first mounting portion (1).

7. The eccentric wheel structure according to claim 5, characterized in that: The central axis of the first connecting member (21) coincides with the central axis of the first mounting portion (1), and the first connecting member (21) is connected to the first mounting portion (1).

8. The eccentric wheel structure according to claim 6, characterized in that: The central axis of the first connecting member (21) coincides with the central axis of the first mounting portion (1), and the first connecting member (21) is connected to the first mounting portion (1).

9. The eccentric wheel structure according to claim 5, characterized in that: The second mounting portion (2) further comprises a second connecting member (22) having a rectangular projection shape, wherein the second connecting member (22) is fixedly connected between the first connecting member (21) and the third mounting portion (3), or is integrally formed.

10. The eccentric wheel structure according to claim 6, characterized in that: The second mounting portion (2) further comprises a second connecting member (22) having a rectangular projection shape, wherein the second connecting member (22) is fixedly connected between the first connecting member (21) and the third mounting portion (3), or is integrally formed.

11. The eccentric wheel structure according to claim 7, characterized in that: The second mounting portion (2) further comprises a second connecting member (22) having a rectangular projection shape, wherein the second connecting member (22) is fixedly connected between the first connecting member (21) and the third mounting portion (3), or is integrally formed.

12. The eccentric wheel structure according to any one of claims 1 to 4, characterized in that: The second mounting portion (2) and the third mounting portion (3) have the same thickness.

13. An air compressor, characterized in that: The invention comprises a motor and a cylinder, and the eccentric wheel structure according to any one of claims 1 to 12.

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