Low-noise structural oilless air compressor

Abstract

The invention belongs to the technical field of air compressors, and relates to a low-noise structural oilless air compressor which comprises a cylinder, a cylinder cover and a piston, wherein the piston is provided with a sealing ring or a sealing leather cup made of a self-lubricating material, a crankcase is tightly connected with a crankcase cover plate and forms a crankcase intake muffler, an air intake one-way valve is arranged at an air intake or an air intake passage of the crankcase intake muffler communicated with the outside atmosphere, a damping pad is arranged between an exhaust valve plate and a valve seat, the valve seat is connected with a silencing cap, a crank pin is made into the shape of a spline or similar to the spline, a heat insulation hole or a heat insulation slot is arranged on a connecting rod body, and a heat insulation pad is arranged at the joint of a fastening bolt and the piston or a connecting rod. The low-noise structural oilless air compressor has the advantages that the air intake noise is low, the working temperature and the mechanical noise of a bearing are low, and an auxiliary balance block is arranged on a cooling fan, thereby reducing the vibration amplitude of the compressors, and effectively reducing the body vibration noise.

Description

technical field [0001] The invention belongs to the technical field of air compressors, and relates to a reciprocating piston type oil-free air compressor, in particular to a reciprocating piston type oil-free air compressor with a low-noise structure. Background technique [0002] Chinese patent application CN200910186501.2 proposes a low-noise reciprocating piston air compressor, which belongs to an oil-free air compressor. A cylinder head is arranged on the cylinder, a piston is arranged in the cylinder, and the piston passes through a connecting rod and a large end of the connecting rod. Bearings and crank pins are connected with the crankshaft. A crankcase is arranged outside the crankshaft. A crankcase cover plate is fastened on the crankcase to form a crankcase intake muffler chamber. An exhaust valve plate and a valve seat are arranged on the cylinder. Equipped with sealing rings or sealing cups made of self-lubricating materials, the biggest feature of this compress...

AI Technical Summary

Problems solved by technology

However, although the compressor proposed in the patent application CN200910186501.2 has the quality of low noise, it is still not perfect in terms of noise reduction. There is a relatively strong intake pulsation anti-spray phenomenon at the port, which is because the volume of the crankcase is significantly reduced during the downward process of the piston, which forces part of the air that has entered the crankcase to return to the outside atmosphere through the intake port. 2) The exhaust valve plate of the compressor hits the valve seat, and the valve seat is directly rigidly connected with the cylinder or cylinder head, resulting in strong mechanical impact, 3) The high-pressure gas formed after compression is discharged from the cylinder through the exhaust check valve and then directly impacts the body of the cylinder head, resulting in a large noise in the cylinder head Exhaust impact noise caused by vibration; 4) The inner ring of the big end bearing of the connecting rod is in full contact with the crank pin, and the crank pin is connected to the rotor of the motor through the crankshaft to form an integral structure. A large amount of heat is generated during work, and a considerable part of the heat is transferred to the big end bearing of the connecting rod. In addition, the heat received by the piston cover will also be transmitted to the shaft of the connecting rod through the fastening screw and then to the outer surface of the big end bearing of the connecting rod. The above factors will make the temperature of the bearing very high, resulting in a larger bearing clearance and greater mechanical noise of the bearing; 5) Like the traditional reciprocating piston oil-free compressor, this compressor only uses one The balance weight, and the inertial force formed by the big end of the connecting rod, the big end bearing of the connecting rod and the crank pin, and the centrifugal force generated by the balance weight are not in a straight line. Due to the unreasonable balance, a certain additional torque is caused. With the compressor Running the additional torque also keeps rotating, resulting in vibration of the compressor, which eventually leads to vibration and noise of the machine body

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