Direct connection type piston crankshaft structure of air compressor

Abstract

The utility model provides a direct connection type piston crankshaft structure of an air compressor, and belongs to the technical field of air compressors. The direct connection type piston crankshaft structure of the air compressor comprises a piston body, a piston bearing and an eccentric crankshaft, the eccentric crankshaft mainly comprises an eccentric positioning block and a bearing seat, and the eccentric crankshaft is directly connected with the piston body through matching of the bearing seat and the piston bearing; the bottom of the eccentric positioning block protrudes to form a pointing block, the whole eccentric positioning block is of a bilateral symmetry structure, a shaft through hole and a balance weight hole are sequentially formed in the eccentric crankshaft above the pointing block in a penetrating mode, the shaft through hole, the balance weight hole and the pointing block are located on the same symmetry axis, a motor output shaft is installed in the shaft through hole in an inserted mode, and a pin hole is perpendicularly formed in the eccentric positioning block. And a positioning pin is mounted in the pin hole in a matched manner and abuts against the output shaft to relatively fix the eccentric crankshaft and the output shaft. The utility model has the advantages that the structure is simple and easy to disassemble, assemble and overhaul, the integrated design structure has higher strength and is not easy to damage, the direct connection type installation reduces the torque transmission loss, and the efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to air compressor technical field, especially relate to a direct connection type piston crankshaft structure of air compressor. BACKGROUND

[0002] Air compressor is a kind of reciprocating piston compressor equipment to compress gas, when motor single-shaft drive compressor crankshaft rotates, through the transmission of connecting rod, the piston with self-lubricating without adding any lubricant does reciprocating motion, the working volume in cylinder will change periodically, inlet valve and exhaust valve open and close at appropriate time, so as to realize the compression and discharge of gas.

[0003] Such as the patent of application No. CN201711365506.2 discloses a crankshaft mounting structure of oil-free air compressor, the outer wall of the rotating shaft is provided with a positioning groove, the end face of the crankshaft is provided with a mounting hole, the rotating shaft is inserted into the mounting hole of the crankshaft, and a positioning screw hole is also formed in the crankshaft, the positioning bolt includes a threaded section and a positioning section with a straight cylindrical outer surface, the threaded section of the positioning bolt is screwed into the positioning screw hole, the positioning section of the positioning bolt is inserted into the positioning groove of the rotating shaft, the end face of the positioning section is pressed against the bottom face of the positioning groove, and the outer diameter of the positioning section matches the width of the positioning groove. The patent solves the problem of easy loosening of the crankshaft of the existing oil-free air compressor, but the connection structure is complex, difficult to install and maintain, and the crankshaft connection structure is easy to wear and deform after long-time operation, causing damage to the air compressor. UTILITY MODEL CONTENTS

[0004] The utility model aims at the above-mentioned problems existing in prior art, provides a direct connection type piston crankshaft structure of air compressor.

[0005] The utility model discloses a direct connection type piston crankshaft structure of air compressor, which can solve the problems of the prior art.

[0006] The eccentric positioning block is provided with a pointing block protruding outward at the bottom, and the pointing block makes the eccentric positioning block have a left-right symmetrical structure, the shaft through hole and the counterweight hole are sequentially and throughly formed in the eccentric crankshaft above the pointing block, the shaft through hole and the counterweight hole are located on the same symmetrical axis as the pointing block, and the through directions of the shaft through hole and the counterweight hole are parallel to the central axis of the eccentric crankshaft but not coincident with the central axis.

[0007] In the above-mentioned direct-drive piston crankshaft structure for an air compressor, the piston connecting rod has a connecting rod tail block protruding at the bottom of the connecting rod big end ring. A through bolt hole is provided on the side of the connecting rod tail block, and a fastening bolt is installed in the bolt hole.

[0008] In the above-mentioned direct-drive piston crankshaft structure for an air compressor, the eccentric crankshaft has through-holes symmetrically formed on both sides of the shaft through hole and the counterweight hole to reduce weight.

[0009] In the above-mentioned direct-drive piston crankshaft structure of an air compressor, a pin hole is vertically opened on the side of the eccentric positioning block facing away from the pointing block. The pin hole passes through the counterweight hole and communicates with the shaft through hole. A positioning pin is installed in the pin hole. When the motor output shaft passes through the shaft through hole, the positioning pin abuts against the keyway of the output shaft to fix the eccentric crankshaft relative to the output shaft.

[0010] In the above-mentioned direct-drive piston crankshaft structure of an air compressor, a pin hole is vertically opened on the eccentric positioning block through the pointing block. The pin hole communicates with the shaft through hole, and a positioning pin is installed in the pin hole. When the motor output shaft passes through the shaft through hole, the positioning pin abuts against the keyway of the output shaft to fix the eccentric crankshaft relative to the output shaft.

[0011] Compared with the prior art, the direct-drive piston crankshaft structure for air compressors provided by this utility model integrates the crank arm, journal and balance weight of a conventional crankshaft into a monolithic eccentric crankshaft. This not only simplifies the crankshaft connection structure and ensures connection strength and coaxiality, but also enables the eccentric crankshaft to be directly connected to the piston connecting rod through the piston bearing, reducing torque transmission loss and facilitating disassembly and maintenance. Attached Figure Description

[0012] Figure 1 This is a structural diagram of the direct-drive piston crankshaft structure of this air compressor;

[0013] Figure 2 This is an exploded view of the direct-drive piston crankshaft structure of this air compressor;

[0014] Figure 3 This is a cross-sectional view of the eccentric positioning block in Embodiment 1;

[0015] Figure 4 This is a cross-sectional view of the eccentric positioning block in Embodiment 2;

[0016] In the above figure, 100 is the piston body; 110 is the piston connecting rod; 111 is the connecting rod big end ring; 120 is the connecting rod tail block; 121 is the bolt hole; 130 is the fastening bolt; 200 is the piston bearing; 300 is the eccentric crankshaft; 310 is the eccentric positioning block; 311 is the shaft through hole; 312 is the counterweight hole; 313 is the weight reduction hole; 314 is the pointing block; 315 is the pin hole; 320 is the bearing housing; and 330 is the positioning pin. Detailed Implementation

[0017] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments. Example 1:

[0018] like Figures 1 to 3 As shown, this air compressor has a direct-drive piston crankshaft structure, including a piston body 100, a piston bearing 200, and an eccentric crankshaft 300. The piston connecting rod 110 of the piston body 100 has a piston head and a connecting rod big end ring 111 formed at both ends, with the piston bearing 200 installed in the central hole of the connecting rod big end ring 111. The eccentric crankshaft 300 mainly includes an eccentric positioning block 310 and a bearing seat 320, with the bearing seat 320 extending into and engaging with the central hole of the piston bearing 200. When the eccentric crankshaft 300 is driven to rotate eccentrically by the motor output shaft, the piston bearing 200 converts the eccentric rotational motion of the eccentric crankshaft 300 into a reciprocating up-and-down displacement motion, thereby driving the piston head of the piston body 100 to reciprocate within the cylinder to compress gas.

[0019] like Figures 2 to 3 As shown, the outer diameter of the eccentric positioning block 310 on the eccentric crankshaft 300 is larger than the outer diameter of the bearing housing 320, so that after the bearing housing 320 and the piston bearing 200 are engaged, the eccentric positioning block 310 is locked on one side of the piston bearing 200 and performs eccentric rotational motion. The eccentric positioning block 310 has a pointing block 314 protruding outward at the bottom, so that the eccentric positioning block 310 has a left-right symmetrical structure. Above the pointing block 314, a shaft through hole 311 and a counterweight hole 312 are sequentially opened from bottom to top on the eccentric crankshaft 300. The shaft through hole 311 and the counterweight hole 312 are located on the same axis of symmetry as the pointing block 314, and their through direction is parallel to the central axis of the eccentric crankshaft 300. The shaft through hole 311 and the counterweight hole 312 do not coincide with the central axis of the eccentric crankshaft 300 and are located on the upper and lower sides of the central axis. The pointing block 314 can point to the side where the shaft through hole 311 is located. Since the side is provided with a protruding pointing block 314 and a through shaft through hole 311, in order to maintain the overall balance of the eccentric crankshaft 300, a counterweight hole 312 is provided on the other side, and the diameter of the shaft through hole 311 should be larger than the diameter of the counterweight hole 312.

[0020] The eccentric crankshaft 300 has through-holes 313 symmetrically opened on both sides of the shaft through-hole 311 and the counterweight hole 312. The weight reduction holes 313 are used to reduce the weight of the eccentric crankshaft 300 while ensuring the overall strength of the eccentric crankshaft 300, thereby reducing the rotational resistance of the eccentric crankshaft 300, reducing production materials, and saving production costs.

[0021] An output shaft is inserted into the shaft through hole 311. A flat-bottomed keyway is milled on the output shaft by a lathe. A pin hole 315 is vertically opened on the side of the eccentric positioning block 310 opposite to the pointing block 314. The pin hole 315 passes through the counterweight hole 312 and communicates with the shaft through hole 311. A positioning pin 330 is installed in the pin hole 315. During installation, the positioning pin 330 enters through the pin hole 315, passes through the counterweight hole 312, and abuts against the keyway of the output shaft to fix the eccentric crankshaft 300 relative to the output shaft. Thus, when the output shaft rotates, it can drive the eccentric crankshaft 300 to perform circumferential eccentric rotation through the connection and cooperation of the eccentric positioning block 310 and the positioning pin 330.

[0022] To further explain, the piston connecting rod 110 has a connecting rod tail block 120 protruding from the bottom of the connecting rod big end ring 111. The connecting tail block serves to provide overall counterweight to the piston body 100 and to point in the installation direction of the piston body 100. The connecting rod tail block 120 has a through bolt hole 121 on its side. A fastening bolt 130 is installed in the bolt hole 121. The fastening bolt 130 can keep the installation between the connecting big end ring and the piston bearing 200 in a tight state by pressing the connecting tail block, thereby strengthening the connection and preventing slippage. Example 2:

[0023] like Figure 4 As shown, based on Embodiment 1, the pin hole 315 and the positioning pin 330 on the eccentric positioning block 310 can be adjusted. A pin hole 315 is vertically opened on the eccentric positioning block 310, passing through the guide block 314. The pin hole 315 communicates with the shaft through hole 311. A positioning pin 330 is fitted inside the pin hole 315. During installation, the positioning pin 330 enters through the pin hole 315, is located inside the guide block 314, and abuts against the keyway of the output shaft, fixing the eccentric crankshaft 300 relative to the output shaft. Thus, when the output shaft rotates, the eccentric crankshaft 300 can also be driven to perform circumferential eccentric rotational motion through the connection and cooperation of the eccentric positioning block 310 and the positioning pin 330.

[0024] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0025] Although this document uses a variety of terms, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of this invention; interpreting them as any additional limitation would contradict the spirit of this invention.

Claims

1. A direct-drive piston crankshaft structure for an air compressor, comprising a piston body (100), a piston bearing (200), and an eccentric crankshaft (300); the piston connecting rod (110) of the piston body (100) has a piston head and a connecting rod big end ring (111) formed at both ends, and the piston bearing (200) is installed in the central hole of the connecting rod big end ring (111); Its features are, The eccentric crankshaft (300) mainly includes an eccentric positioning block (310) and a bearing housing (320). During installation, the bearing housing (320) extends into the central hole of the piston bearing (200) and is connected to it. The outer diameter of the eccentric positioning block (310) is larger than the outer diameter of the bearing housing (320), and a pointing block (314) is formed by protruding outward at the bottom. The pointing block (314) makes the eccentric positioning block (310) have a left-right symmetrical structure. A shaft through hole (311) and a counterweight hole (312) are sequentially opened on the eccentric crankshaft (300) above the pointing block (314). The shaft through hole (311) and the counterweight hole (312) are located on the same axis of symmetry as the pointing block (314), and the through direction of the two is parallel to the central axis of the eccentric crankshaft (300) but does not coincide.

2. The direct-drive piston crankshaft structure for an air compressor according to claim 1, characterized in that, The piston connecting rod (110) has a connecting rod tail block (120) protruding at the bottom of the connecting rod big end ring (111). The connecting rod tail block (120) has a through bolt hole (121) on its side, and a fastening bolt (130) is installed in the bolt hole (121).

3. The direct-drive piston crankshaft structure for an air compressor according to claim 1, characterized in that, The eccentric crankshaft (300) has through-holes (313) symmetrically formed on both sides of the shaft through-hole (311) and the counterweight hole (312).

4. A direct-drive piston crankshaft structure for an air compressor according to claim 1 or 3, characterized in that, The eccentric positioning block (310) has a pin hole (315) vertically opened on the side opposite to the pointing block (314). The pin hole (315) passes through the counterweight hole (312) and communicates with the shaft through hole (311). A positioning pin (330) is installed in the pin hole (315). When the motor output shaft passes through the shaft through hole (311), the positioning pin (330) abuts against the keyway of the output shaft to fix the eccentric crankshaft (300) relative to the output shaft.

5. A direct-drive piston crankshaft structure for an air compressor according to claim 1 or 3, characterized in that, The eccentric positioning block (310) has a pin hole (315) that passes through the pointing block (314) and is vertically opened. The pin hole (315) communicates with the shaft through hole (311). A positioning pin (330) is installed in the pin hole (315). When the motor output shaft passes through the shaft through hole (311), the positioning pin (330) abuts against the keyway of the output shaft to fix the eccentric crankshaft (300) relative to the output shaft.

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