Oilless air compressor

Abstract

The invention provides an oilless air compressor, belongs to the technical field of air compressors and solves the problem that an existing oilless air compressor is not stable enough in working. Theoilless air compressor comprises a motor, a crank case and fan blades, wherein the crank case is fixed onto the motor, and the fan blades are rotatably connected onto the crank case through fan bladeshafts. A motor shaft of the motor extends into the crank case, the end of the motor shaft is fixedly connected with parallel and eccentric cranks, the fan blade shafts and the motor shaft have the same axes, connectors capable of circumferentially fixing the motor shaft and the fan blade shafts are connected among the fan blade shafts and the cranks and circumferentially fixed to the fan blade shafts, and the connectors are in sliding fit with at least one of the fan blade shafts and the cranks in the vertical connecting line direction of the motor shaft and the cranks. The oilless air compressor is more stable in work and longer in service life.

Description

technical field [0001] The invention belongs to the technical field of air compressors, and relates to an oil-free air compressor. Background technique [0002] The oil-free air compressor is a miniature reciprocating piston compressor. When the motor drives the compressor crankshaft to rotate, through the transmission of the connecting rod, the piston with self-lubrication without adding any lubricant will reciprocate. The working volume formed by the top surface of the piston and the top surface of the piston will change periodically. Oil-free air compressors are divided into 2V, 3Y, 4V, 6Y and other models according to the number of cylinders. 2V means that one end of the motor has 2 cylinders, 3Y means that one end of the motor has 3 cylinders, and 4V means that the motor has 2 cylinders. There are 2 cylinders at both ends of the motor, and 6Y means that both ends of the motor have 3 cylinders. When the number of cylinders of the air compressor is large or the requireme...

AI Technical Summary

Problems solved by technology

[0003] However, when the air compressor has a small number of cylinders and requires a high exhaust volume, the exhaust volume of the cylinder needs to be increased, so the stroke of the piston needs to be increased, that is, the eccentric distance of the eccentric wheel needs to be increased, but the distance between the connecting rod and the eccentric wheel There is also a bearing structure with a larger diameter in between, so that the use of eccentric connection will cause the volume of the air compressor to be too large. Therefore, when the number of cylinders at one or both ends of the air compressor is small, such as 2V and 4V air compressors, at the same time When the displacement requirement is high, the crankshaft structure needs to be adopted, such as the crankshaft structure in the reference document (application number: 201520878040.6), (application number: 201520441903.3) and (application number: 201510935279.7), that is, the motor shaft Connected to the crankshaft, the connecting rod of the piston is directly sleeved on the crankshaft

However, as shown in the above comparative documents, the fan blades need to be fixed at the end of the crankshaft after the crankshaft is used. Therefore, the crankshafts in the above comparative documents are all fixed to the eccentric position of the fan blades. This structure is difficult to ensure the wind when the fan blades are installed. The concentricity between the blade and the motor shaft, and the blade is prone to instability during long-term use

[0004] Aiming at the above-mentioned problem of unstable rotation of fan blades after using a crankshaft, the patent document (application number: 201710561966.6) discloses an oil-free air compressor, an eccentric crankshaft is fixedly connected to the end of the motor shaft, and the end of the crankshaft is fixedly connected to the There is an eccentric shaft, the eccentric shaft has the same axis line as the motor shaft, one end of the eccentric shaft protrudes from the end face of the crankcase, the fan blade is arranged outside the crankcase, and the end of the eccentric shaft is fixed to the center of the fan blade Connected, that is, the fan blade is fixedly connected to the crankshaft through the eccentric shaft, so that the fan blade and the motor shaft are concentric. However, the eccentric shaft is positioned on the crankcase through the bearing, and the motor is also fixed on the crankcase. The eccentric shaft is fixedly connected, which not only requires that the eccentric distance between the crankshaft and the motor shaft is exactly the same as that of the eccentric shaft, but also because the eccentric shaft is installed on the crankcase cover, and the motor is fixed on the crankcase body , it is difficult to ensure that the motor shaft and the eccentric shaft have absolute coaxiality after the box cover and the box body are assembled, and when there is a slight deviation in the coaxiality of the two, the circular trajectory of the crankshaft is concentric with the motor shaft during operation , so it is difficult to be concentric with the fan blades. At this time, the crankshaft will generate a radial push-pull force on the fixedly connected eccentric shaft. Leaf operation stability, reduced service life

Images