WO2022041908A1

WO2022041908A1 - Air compressor

Info

Publication number: WO2022041908A1
Application number: PCT/CN2021/097864
Authority: WO
Inventors: 曹再华; 潘军辉
Original assignee: 浙江巨霸机电科技股份有限公司
Priority date: 2020-08-24
Filing date: 2021-06-02
Publication date: 2022-03-03
Also published as: CN212774687U

Abstract

An air compressor, comprising: a drive motor (1) and a seat body (2) located at an end part of the drive motor (1). The seat body (2) has a cylindrical shape that runs through at both ends. An eccentric disk (3) is connected to an output shaft of the drive motor (1), and the eccentric disk (3) is located within the seat body (2). A cylinder body (4) is fixedly provided on the peripheral surface of the seat body (2). A piston (5) is provided within the cylinder body (4). The piston (5) is connected to a piston rod (6) extending into the seat body (2). One end part of the piston rod (6) faces the peripheral surface of the eccentric disk (3), and when rotating eccentrically, the eccentric disk (3) is capable of driving the piston rod (6) to move linearly. The present air compressor has a compact structure and a long service life.

Description

an air compressor

technical field

The utility model belongs to the technical field of compressor manufacturing, and relates to an air compressor.

Background technique

Air compressor, referred to as air compressor, is a device used to compress gas. It converts the mechanical energy of the prime mover (usually an electric motor or a diesel engine) into gas pressure energy, and provides air power. It is the core equipment of the pneumatic system. , has become one of the main mechanical power equipment of many enterprises. The existing air compressor generally includes a motor, a crankcase and a cylinder assembly. The motor has a motor casing and a motor end cover. The crankcase is fixedly installed on the motor end cover, and the eccentric wheel is installed on the motor shaft. The cylinder assembly is connected to the eccentric through a connecting rod. When working, the motor drives the eccentric wheel to realize the movement of the connecting rod piston, and the movement of the connecting rod piston realizes the work of the cylinder assembly; according to the actual needs, the vacuum pump assembly has a single cylinder and a multi-cylinder, of which the multi-cylinder vacuum pump is generally double-cylinder or four-cylinder. , Generally, the two sides of the motor with four cylinders are distributed in twos. Each cylinder needs to be matched with the connecting rod and the eccentric. Due to the different phase angles of the cylinders, the vibration and noise of the air compressor are relatively large during operation.

For example, a Chinese patent (announcement number: CN107120257B; authorization announcement date: 2020-06-26) discloses an oil-free air compressor, which includes a motor and a fan blade, and a crankcase is fixedly connected to the end of the motor. Two cylinders are fixedly connected, a piston is arranged in the cylinder, the motor shaft of the motor extends into the crankcase, and an eccentrically arranged crankshaft is fixedly connected to the end of the motor shaft, and the crankshaft is connected with the piston through a connecting rod assembly. It is characterized in that an eccentric shaft is fixedly connected to the end of the crankshaft, the eccentric shaft and the motor shaft have the same axis line, one end of the eccentric shaft protrudes from the end face of the crankcase, the fan blades are arranged outside the crankcase, and the eccentric shaft is located outside the crankcase. The end is fixedly connected with the central position of the fan blade.

In the above-mentioned patent documents, the piston in the cylinder is connected with the crankshaft through an eccentric connecting rod. When there are multiple cylinders, since the eccentric connecting rod has a certain thickness, the multiple eccentric connecting rods are sequentially sleeved on the crankshaft, which will cause phase dislocation. , cannot be located on the same plane, and the corresponding cylinders should also be staggered along the crankshaft axis, which will lead to an increase in the length of the entire air compressor, which is not compact enough and has a large volume; in addition, the eccentric connecting rod swings and reciprocates under the drive of the crankshaft. The mixed motion of the piston will be unstable in the reverse direction, and the lateral force will cause wear of the piston or cylinder, which will affect the service life of the air compressor.

SUMMARY OF THE INVENTION

The utility model provides an air compressor according to the above problems existing in the prior art, and the technical problem to be solved by the utility model is: how to improve the structure compactness and service life of the air compressor.

The purpose of the present utility model can be achieved through the following technical solutions:

An air compressor, comprising a drive motor and a seat located at the end of the drive motor, the seat is in the shape of a cylinder with two ends running through it, and is characterized in that an eccentric disc is connected to the output shaft of the drive motor. The eccentric disc is located in the seat body, a cylinder is fixed on the outer peripheral surface of the seat body, a piston is arranged in the cylinder body, and a piston rod extending into the seat body is connected to the piston, so One end of the piston rod faces the outer peripheral surface of the eccentric disk, and the eccentric disk can drive the piston rod to move linearly when the eccentric disk rotates eccentrically.

The principle is as follows: the cylinder block has an outlet hole and an inlet hole, and the outlet hole and the inlet hole are provided with a one-way structure. The compressed air flows out of the cylinder, and the piston reciprocates in the cylinder to generate compressed air; in this technical solution, the eccentric disc is driven to rotate by the drive motor, and the outer peripheral surface of the eccentric disc has an eccentric displacement amount, so as to push the piston rod to move linearly, thereby driving the piston to move Compressed gas is generated; in this technical solution, the piston rod and the cylinder body are coaxially arranged, and the piston rod does not need to swing left and right, and it always moves along the axis direction of the cylinder body, so there is only a stable axial force when the piston rod pushes the piston to move, and no It will give the piston lateral force to press the inner wall of the cylinder, which greatly reduces the wear of the piston and the cylinder, and improves the service life of the air compressor; when there are multiple cylinders distributed outside each seat, all the cylinders can surround In the direction of the outer peripheral surface of the eccentric disc, all the corresponding piston rods and the eccentric disc are located on the same plane, and there is no need to stagger each other, and the structure is more compact, which can greatly reduce the axial length of the air compressor under the premise of ensuring the power of the air compressor. , reducing its size and footprint.

In the above air compressor, a mounting seat is fixed on one end of the piston rod, and a roller is arranged on the mounting seat, the roller abuts against the outer peripheral surface of the eccentric disc, and the piston rod is on the A return spring is also sleeved, and both ends of the return spring act on the end face of the mounting seat and the end face of the cylinder body respectively. When the eccentric disc rotates eccentrically, the eccentric part of the eccentric disc pushes the roller and the mounting seat, and then pushes the piston rod and the piston to move linearly in the cylinder, compressing the air, and then after the eccentric part of the eccentric disc leaves, under the action of the return spring Drive the piston rod and the piston to reset. At this time, the cylinder is in the suction process. The roller roller friction between the piston rod and the eccentric disc reduces friction, wear and noise.

In the above air compressor, one end of the piston rod is fixed with a mounting seat, the mounting seat is provided with a roller, an eccentric bearing is sleeved on the outer peripheral surface of the eccentric disc, and the roller is connected to the The outer peripheral surface of the outer ring of the eccentric bearing abuts against; the piston rod is also sleeved with a return spring, and both ends of the return spring act on the end surface of the mounting seat and the end surface of the cylinder body respectively. By arranging the eccentric bearing, when the eccentric disc pushes the piston rod and the piston moves linearly in the cylinder, there is less friction between the piston rod and the eccentric disc, reducing wear and noise.

In the above-mentioned air compressor, a through hole corresponding to the cylinder is formed on the outer peripheral surface of the seat body, and a guide cylinder along the axial direction of the through hole is also provided on the outer peripheral surface of the seat body. ; The cylinder is fixed on the end of the guide cylinder, and the piston rod extends into the seat through the guide cylinder. Further, the guide cylinder and the through hole are arranged coaxially, and the guide cylinder and the seat are integrally formed by casting.

In the above-mentioned air compressor, the eccentric disc is provided with a number of weight reduction holes; the weight reduction holes are distributed at intervals along the circumference of the eccentric disc, and each of the weight reduction holes penetrates through the eccentric disc. two sides; the diameter of the weight reduction hole on one side of the eccentric part of the eccentric disk is larger than that of the other side. By setting the weight reduction holes, the mass of the eccentric disc is reasonably distributed, so that when the eccentric disc is running eccentrically, the eccentric inertia caused by uneven mass distribution is reduced, thereby reducing the damage to the drive motor and improving the service life of the air compressor; Setting weight-reducing holes can also save materials, reduce costs, and make the entire air compressor lighter.

In the above-mentioned air compressor, a sliding plate is fixed at one end of the piston rod, a sliding groove is opened on the side of the sliding plate, and the outer peripheral surface of the eccentric plate is slidably embedded in the sliding groove, so A return spring is also sleeved on the piston rod, and both ends of the return spring act on the end face of the sliding plate and the end face of the cylinder, respectively. When the eccentric disc rotates eccentrically, the eccentric part of the eccentric disc pushes the sliding disc, thereby pushing the piston rod and the piston to move linearly in the cylinder, compressing the air, and then after the eccentric part of the eccentric disc leaves, it drives the piston rod under the action of the return spring. And the piston is reset. At this time, the cylinder is in the suction process, and the outer periphery of the eccentric disc is embedded in the chute of the sliding disc. The two can maintain stability and reduce shaking, thereby ensuring the stable linear movement of the piston rod and the piston, and reducing wear and tear.

In the above-mentioned air compressor, a sliding plate is fixed at one end of the piston rod, a sliding groove is opened on the side of the sliding plate, an eccentric bearing is sleeved on the outer peripheral surface of the eccentric plate, and the eccentric bearing is The outer ring of the sliding plate is embedded in the chute; the piston rod is also sleeved with a return spring, and the two ends of the return spring act on the end face of the sliding plate and the end face of the cylinder respectively. By setting the eccentric bearing, when the eccentric disc pushes the piston rod and the piston to move linearly in the cylinder, there is less friction between the sliding disc and the eccentric disc, reducing wear and noise.

In the above-mentioned air compressor, one end of the piston rod is fixed with a connecting column, the other end of the piston rod is connected with the piston, and the outer peripheral surface of the eccentric disc is provided with an annular ring along its circumferential direction. a groove, and a rolling ball is embedded between the end surface of the connecting column and the annular groove. When the eccentric disc pushes the piston rod to move, the rolling contact between the two is achieved through the rolling ball, reducing friction and wear.

In the above air compressor, the groove wall and groove bottom of the annular groove are arc-shaped, and the middle of the end face of the connecting column has an arc-shaped concave cavity; the rolling ball is rolling and embedded in the arc-shaped concave cavity and inside the annular groove. This can effectively prevent the ball from falling off, and at the same time ensure the smoothness of the rolling of the ball. Further, there is a step on the outer peripheral surface of the connecting column, one end of the spring abuts on the step, and the other end abuts on the end surface of the cylinder.

In the above-mentioned air compressor, the eccentric disc is elliptical, the number of the cylinders is two, and the cylinders are symmetrically arranged on both sides of the base; one end of the piston rod is fixed with a mounting seat, so The mounting seat is provided with rollers, the rollers abut against the outer peripheral surface of the eccentric disc, the piston rod is also sleeved with a return spring, and both ends of the return spring act on the mounting seat respectively the end face of the cylinder and the end face of the cylinder. The end of the piston rod is connected to the middle of the eccentric disc, and the eccentric disc is oval, so that the eccentric disc has a symmetrical eccentric structure on both sides. When the eccentric disc rotates, it can push the pistons in the two cylinders to exhaust at the same time. power.

Compared with the prior art, the air compressor in the present utility model has the following advantages:

1. In this utility model, the piston rod and the cylinder body are coaxially arranged, and the piston rod does not need to swing left and right, and it always moves along the axis direction of the cylinder body, so there is only a stable axial force when the piston rod pushes the piston to move, which will not give The lateral force of the piston is pressed against the inner wall of the cylinder, which greatly reduces the wear of the piston and the cylinder, and improves the service life of the air compressor.

2. When a plurality of cylinders are distributed outside each seat in the present invention, all the cylinders can surround the outer peripheral surface of the eccentric disc, and all the corresponding piston rods and the eccentric disc are located on the same plane, and do not need to be staggered with each other, and the structure is more convenient. Compact, so on the premise of ensuring the power of the air compressor, the axial length of the air compressor can be greatly reduced, and its volume and occupied space can be reduced.

Description of drawings

FIG. 1 is a schematic three-dimensional structure diagram of the air compressor in the first embodiment.

2 is a schematic diagram of a partial explosion structure of the air compressor in the first embodiment.

FIG. 3 is a schematic three-dimensional structure diagram of the base body of the air compressor in the first embodiment.

4 is a schematic diagram of a partial explosion structure of the air compressor in the second embodiment.

5 is a schematic diagram of a partial explosion structure of the air compressor in the third embodiment.

6 is a schematic diagram of a partial explosion structure of the air compressor in the fourth embodiment.

7 is a schematic diagram of a partial explosion structure of the air compressor in the fifth embodiment.

FIG. 8 is a schematic three-dimensional structure diagram of the air compressor in the sixth embodiment.

9 is a schematic diagram of a partial explosion structure of the air compressor in the sixth embodiment.

In the figure, 1, drive motor; 2, seat body; 2a, through hole; 2b, guide cylinder; 3, eccentric disc; 3a, weight reduction hole; 3b, annular groove; 4, cylinder body; 5, piston; 6. Piston rod; 7. Mounting seat; 8. Roller; 9. Return spring; 10. Eccentric bearing; 11. Sliding disc; 11a, chute; 12, connecting column; 12a, arc-shaped cavity; 12b, step ; 13, rolling ball; 14, shell; 15, fan blade.

detailed description

The following are specific embodiments of the present utility model combined with the accompanying drawings to further describe the technical solutions of the present utility model, but the present utility model is not limited to the following embodiments.

Example 1

As shown in FIGS. 1 , 2 and 3 , the air compressor in this embodiment includes a drive motor 1 and a base body 2 located at the end of the drive motor 1 . The base body 2 has a cylindrical shape with two ends penetrating through it. The shaft is connected with an eccentric disc 3 and the eccentric disc 3 is located in the seat body 2, a cylinder 4 is fixed on the outer peripheral surface of the seat body 2, a piston 5 is arranged in the cylinder body 4, and the piston 5 is connected to the seat body 2. The inner piston rod 6, one end of the piston rod 6 faces the outer peripheral surface of the eccentric disc 3, and the eccentric disc 3 can drive the piston rod 6 to move linearly when the eccentric disc 3 rotates eccentrically. Specifically, a mounting seat 7 is fixed on one end of the piston rod 6, a roller 8 is arranged on the mounting seat 7, the roller 8 abuts against the outer peripheral surface of the eccentric disc 3, and a return spring 9 is also sleeved on the piston rod 6 And both ends of the return spring 9 act on the end face of the mounting seat 7 and the end face of the cylinder block 4 respectively. The cylinder block 4 has an air outlet hole and an air inlet hole. The air outlet hole and the air inlet hole are provided with a one-way structure. The air flow at the air inlet hole can only flow to the cylinder block 4 in one direction, and the air flow at the air outlet hole can only flow out in one direction. Outside the cylinder 4, the piston 5 reciprocates in the cylinder 4 to generate compressed air; in this embodiment, the eccentric disc 3 is driven to rotate by the drive motor 1, and the outer peripheral surface of the eccentric disc 3 has an eccentric displacement, thereby pushing the piston rod 6 to move linearly , and then drive the piston 5 to move to generate compressed gas; in this embodiment, the piston rod 6 is arranged coaxially with the cylinder 4, and the piston rod 6 does not need to swing left and right, and it always moves along the axis of the cylinder 4, so the piston rod 6 pushes the piston When 5 moves, there is only one stable axial force, which will not give the piston 5 lateral force to press the inner wall of the cylinder block 4, which greatly reduces the wear of the piston 5 and the cylinder block 4, and improves the service life of the air compressor; When a plurality of cylinders 4 are distributed outside each seat body 2, all the cylinders 4 can surround the outer peripheral surface of the eccentric disc 3, and all the corresponding piston rods 6 and the eccentric disc 3 are located on the same plane, and do not need to be staggered with each other. Compact, so on the premise of ensuring the power of the air compressor, the axial length of the air compressor can be greatly reduced, and its volume and occupied space can be reduced.

In this embodiment, when the eccentric disc 3 rotates eccentrically, the eccentric portion of the eccentric disc 3 pushes the roller 8 and the mounting seat 7, thereby pushing the piston rod 6 and the piston 5 to move linearly in the cylinder 4, compressing the air, and then the eccentric disc 3 After the eccentric part leaves, the piston rod 6 and the piston 5 are driven to reset under the action of the reset spring 9. At this time, the inhalation process is in the cylinder 4, and the friction between the piston rod 6 and the eccentric disc 3 is reduced by the roller 8 Friction, reduce wear and reduce noise.

As shown in Figures 2 and 3, a through hole 2a corresponding to the cylinder 4 is formed on the outer peripheral surface of the seat body 2, and the outer peripheral surface of the seat body 2 also has a guide cylinder 2b along the axial direction of the through hole 2a; The cylinder 4 is fixed on the end of the guide cylinder 2b, the piston rod 6 extends through the guide cylinder 2b into the seat body 2, the guide cylinder 2b and the through hole 2a are coaxially arranged, and the guide cylinder 2b and the seat body 2 One-piece casting. The eccentric disc 3 is provided with a number of weight reduction holes 3a; the weight reduction holes 3a are distributed at intervals along the circumferential direction of the eccentric disc 3, and each weight reduction hole 3a runs through both sides of the eccentric disc 3; The diameter of the heavy hole 3a is larger than that of the weight reduction hole 3a on the other side; by setting the weight reduction hole 3a, the mass of the eccentric disc 3 is reasonably distributed, so that when the eccentric disc 3 runs eccentrically, the eccentric inertia caused by uneven mass distribution is reduced, Thereby, damage to the driving motor 1 is reduced, and the service life of the air compressor is improved; in addition, by arranging the weight reduction holes 3a, materials can also be saved, costs can be reduced, and the entire air compressor can be made lighter.

In this embodiment, the number of bases 2 can be one or two. When the number of bases 2 is one, it is fixed to one end of the driving motor 1 , and when the number of bases 2 is two, it is symmetrically fixed to the driving motor. 1 ends. As shown in FIG. 1 and FIG. 2 , preferably, in this embodiment, the number of seats 2 is two, the eccentric disc 3 is directly sleeved on the output shaft of the drive motor 1 , and each seat 2 can be provided with a corresponding 1 to 4 cylinders 4, thereby improving work efficiency. Further, in this embodiment, both ends of the drive motor 1 are fixedly connected with a casing 14 , the base body 2 is located inside the casing 14 , and the outer peripheral surface of the drive motor 1 has a number of elongated heat sinks arranged along its axial direction. , the end face of the outer casing 14 is provided with a ventilation opening, and the outer casing 14 is provided with a fan blade 15, and the fan blade 15 is connected to the output shaft of the drive motor 1 and is located between the inner end face of the outer casing 14 and the outer end face of the base 2; the above-mentioned There is no need for a crankshaft in the connection structure of the piston rod 6, so the end of the output shaft of the drive motor 1 is directly fixed to the center of the fan blade 15, so that the fan blade 15 and the output shaft of the drive motor 1 have better coaxiality, The rotation of the fan blade 15 is also relatively stable.

Embodiment 2

As shown in FIG. 4 , the air compressor in this embodiment is roughly the same as the first embodiment, the difference is that in this embodiment, an eccentric bearing 10 is sleeved on the outer peripheral surface of the eccentric disc 3 , and the roller 8 and the eccentric bearing are sleeved. The outer peripheral surface of the outer ring of 10 abuts against each other; the piston rod 6 is also sleeved with a return spring 9 and both ends of the return spring 9 act on the end face of the mounting seat 7 and the end face of the cylinder 4 respectively; When the eccentric disc 3 pushes the piston rod 6 and the piston 5 to move linearly in the cylinder 4, there is less friction between the piston rod 6 and the eccentric disc 3, reducing wear and noise.

Embodiment 3

As shown in FIG. 5 , the air compressor in this embodiment is roughly the same as the first embodiment, the difference is that in this embodiment, one end of the piston rod 6 is fixed with a sliding plate 11 , and a side surface of the sliding plate 11 is provided with a sliding plate 11 . The chute 11a, the outer peripheral surface of the eccentric disc 3 is slidably embedded in the chute 11a, the piston rod 6 is also sleeved with a return spring 9, and both ends of the return spring 9 act on the end face of the sliding disc 11 and the cylinder 4 respectively. On the end face; when the eccentric disc 3 rotates eccentrically, the eccentric part of the eccentric disc 3 pushes the sliding disc 11, and then pushes the piston rod 6 and the piston 5 to move linearly in the cylinder 4, compressing the air, and then the eccentric part of the eccentric disc 3 leaves after , Under the action of the reset spring 9, the piston rod 6 and the piston 5 are driven to reset. At this time, the cylinder 4 is in the process of inhalation, and the outer periphery of the eccentric disk 3 is embedded in the chute 11a of the sliding disk 11, and the two can be kept stable. Reduce shaking, so as to ensure stable linear movement of piston rod 6 and piston 5; reduce wear.

Embodiment 4

As shown in FIG. 6 , the air compressor in this embodiment is roughly the same as the third embodiment, the difference is that in this embodiment, one end of the piston rod 6 is fixed with a sliding plate 11 , and a side surface of the sliding plate 11 is provided with a sliding plate 11 . The chute 11a, the eccentric bearing 10 is sleeved on the outer peripheral surface of the eccentric disc 3, and the outer ring of the eccentric bearing 10 is embedded in the chute 11a; the piston rod 6 is also sleeved with a return spring 9 and both ends of the return spring 9 Act on the end face of the sliding disk 11 and the end face of the cylinder 4 respectively; by setting the eccentric bearing 10, when the eccentric disk 3 pushes the piston rod 6 and the piston 5 to move linearly in the cylinder 4, the sliding disk 11 and the eccentric disk 3 There is less friction between them, reducing wear and noise.

Embodiment 5

As shown in FIG. 7 , the air compressor in this embodiment is roughly the same as the first embodiment, the difference is that in this embodiment, one end of the piston rod 6 is fixed with a connecting column 12 , and the other end of the piston rod 6 is connected to the piston rod 6 . 5 are connected, the outer peripheral surface of the eccentric disc 3 is provided with an annular groove 3b along its circumferential direction, and a rolling ball 13 is embedded between the end surface of the connecting column 12 and the annular groove 3b. Further, the groove wall and groove bottom of the annular groove 3b are arc-shaped, and the middle of the end face of the connecting column 12 has an arc-shaped concave cavity 12a; the rolling ball 13 is rolled and embedded in the arc-shaped concave cavity 12a and the annular groove 3b; connecting The outer peripheral surface of the column 12 has a step 12 b , one end of the spring abuts on the step 12 b , and the other end abuts on the end surface of the cylinder 4 . When the eccentric disc 3 pushes the piston rod 6 to move, the rolling contact between the two is achieved through the rolling ball 13 to reduce friction and wear.

Embodiment 6

As shown in FIGS. 8 and 9 , the air compressor in this embodiment is roughly the same as that in Embodiment 1, the difference is that in this embodiment, the eccentric disk 3 is elliptical, and the number of cylinders 4 is two and symmetrical It is arranged on both sides of the seat body 2; one end of the piston rod 6 is fixed with a mounting seat 7, the mounting seat 7 is provided with a roller 8, the roller 8 abuts against the outer peripheral surface of the eccentric disc 3, and the piston rod 6 is also sleeved There is a return spring 9 and both ends of the return spring 9 act on the end face of the mounting seat 7 and the end face of the cylinder 4 respectively; the end of the piston rod 6 is connected to the middle of the eccentric disc 3, and the eccentric disc 3 is oval, so that the eccentric The disc 3 has an eccentric structure with symmetrical two sides. When the eccentric disc 3 rotates, it can simultaneously push the pistons 5 in the two cylinders 4 to exhaust to the outside, thereby increasing the power.

The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art of the present invention can make various modifications or supplements to the described specific embodiments or replace them in similar ways, but will not deviate from the spirit of the present invention or go beyond the appended claims the defined range.

Claims

An air compressor, comprising a drive motor (1) and a seat body (2) located at the end of the drive motor (1), the seat body (2) being in the shape of a cylinder with two ends penetrating, characterized in that the An eccentric disc (3) is connected to the output shaft of the drive motor (1), and the eccentric disc (3) is located in the seat body (2), and a cylinder is fixed on the outer peripheral surface of the seat body (2). body (4), a piston (5) is arranged in the cylinder body (4), and a piston rod (6) extending into the seat body (2) is connected to the piston (5), the piston rod One end of (6) faces the outer peripheral surface of the eccentric disc (3) and the eccentric disc (3) can drive the piston rod (6) to move linearly when the eccentric disc (3) rotates eccentrically.
The air compressor according to claim 1, wherein a mounting seat (7) is fixed on one end of the piston rod (6), and a roller (8) is arranged on the mounting seat (7), so The roller (8) abuts against the outer peripheral surface of the eccentric disc (3), the piston rod (6) is also sleeved with a return spring (9), and the two ends of the return spring (9) act respectively. On the end face of the mounting seat (7) and the end face of the cylinder (4).
The air compressor according to claim 1, wherein a mounting seat (7) is fixed on one end of the piston rod (6), and a roller (8) is arranged on the mounting seat (7), so An eccentric bearing (10) is sleeved on the outer peripheral surface of the eccentric disc (3), and the roller (8) abuts against the outer peripheral surface of the outer ring of the eccentric bearing (10); on the piston rod (6) A return spring (9) is also sleeved, and both ends of the return spring (9) act on the end face of the mounting seat (7) and the end face of the cylinder (4) respectively.
The air compressor according to claim 1, 2 or 3, characterized in that, a through hole (2a) corresponding to the cylinder (4) is formed on the outer peripheral surface of the seat body (2), so The outer peripheral surface of the seat body (2) is further provided with a guide cylinder (2b) along the axial direction of the through hole (2a); the cylinder (4) is fixed on the end of the guide cylinder (2b) The piston rod (6) extends into the seat body (2) through the guide cylinder body (2b).
The air compressor according to claim 1, 2 or 3, characterized in that, the eccentric disc (3) is provided with a plurality of weight reduction holes (3a); the weight reduction holes (3a) are along the eccentric The disks (3) are distributed at intervals in the circumferential direction, and each of the weight-reducing holes (3a) runs through both sides of the eccentric disk (3); the weight-reducing holes (3a) on one side of the eccentric portion of the eccentric disk (3) The hole diameter is larger than that of the weight reduction hole (3a) on the other side.
The air compressor according to claim 1, wherein a sliding plate (11) is fixed at one end of the piston rod (6), and a sliding groove (11a) is formed on the side of the sliding plate (11). , the outer peripheral surface of the eccentric disc (3) is slidably embedded in the chute (11a), the piston rod (6) is also sleeved with a return spring (9) and the return spring (9) is Both ends act on the end face of the sliding plate (11) and the end face of the cylinder (4) respectively.
The air compressor according to claim 1, wherein a sliding plate (11) is fixed at one end of the piston rod (6), and a sliding groove (11a) is formed on the side of the sliding plate (11). , an eccentric bearing (10) is sleeved on the outer peripheral surface of the eccentric disc (3), and the outer ring of the eccentric bearing (10) is embedded in the chute (11a); the piston rod (6) A return spring (9) is also sleeved on the upper part, and both ends of the return spring (9) act on the end face of the sliding plate (11) and the end face of the cylinder (4) respectively.
The air compressor according to claim 1, characterized in that a connecting column (12) is fixed at one end of the piston rod (6), and the other end of the piston rod (6) is connected to the piston (5) connected, the outer peripheral surface of the eccentric disc (3) is provided with an annular groove (3b) along its circumferential direction, and the end face of the connecting column (12) and the annular groove (3b) are embedded There are boules (13).
The air compressor according to claim 8, characterized in that the groove wall and groove bottom of the annular groove (3b) are arc-shaped, and the middle of the end face of the connecting column (12) has an arc-shaped cavity (12a) ); the rolling ball (13) is rollingly embedded in the arc-shaped concave cavity (12a) and the annular groove (3b).
The air compressor according to claim 1, characterized in that, the eccentric disc (3) is elliptical, the number of the cylinders (4) is two, and the cylinders (4) are symmetrically arranged on the side of the seat (2). two sides; one end of the piston rod (6) is fixed with a mounting seat (7), the mounting seat (7) is provided with a roller (8), the roller (8) and the eccentric disc ( 3) against the outer peripheral surface of the piston rod (6), a return spring (9) is also sleeved on the piston rod (6), and the two ends of the return spring (9) act on the end surface of the mounting seat (7) and the on the end face of the cylinder body (4).