Oil pumping device, compressor and electric appliance

Abstract

The invention relates to an oil pumping device, a compressor and an electric appliance. The oil pumping device comprises a crankshaft, an oil pump and an elastic piece. An inner cavity is provided in the crankshaft, and the end, facing an oil pool, of the crankshaft is provided with a positioning groove. The oil pump is arranged in the inner cavity, forms a spiral oil groove with the inner cavity and is provided with a positioning part in clearance fit with the positioning groove. One end of the elastic piece is connected into the oil pump. The crankshaft rotates, and oil enters the spiral oil groove from the oil pool to drive the oil pump and the elastic piece to spirally ascend relative to the crankshaft until the positioning part abuts against the positioning groove. No matter the compressor is in a shutdown period or an operation period, the loss between the oil pump and the oil pool can be reduced, the friction loss after operation is lower, the rotating mechanical friction of the oil pump in the compressor is avoided, the rotating noise of the crankshaft is reduced, and the service life of the oil pump and even the compressor is ensured; it is guaranteed that the compressor has the excellent oil pumping effect at low frequency, and the energy efficiency ratio of the compressor is increased; and the oil pump and the elastic piece are simple in structure, automatic production and assembly are easy, and the assembly precision can be guaranteed.

Description

technical field [0001] The present application relates to the field of oil pumping structures, in particular to an oil pumping device, a compressor and an electrical appliance. Background technique [0002] With the development of technology, common home appliances such as refrigerators and air conditioners can use frequency modulation to change the working mode, and then the compressor can be operated according to different modes. Whether the piston compressor can run efficiently depends on the lubricity of the moving parts of the pump body. At present, the refrigerator compressor is basically a vertical crank bearing lubricating oil pump. An oil pool is formed at the bottom of the compressor. When the compressor is running, the motor drives the oil pump through the crankshaft, and the oil in the oil pool is transported to the position of the whole pump body that needs lubrication through the oil circuit inside the crankshaft, so as to ensure the efficient operation of the ...

AI Technical Summary

Problems solved by technology

[0003] When the compressor runs at high frequency, the oil pumping effect basically meets the requirements, but when the compressor runs at a low frequency, the centrifugal oil pump cannot meet the needs of pumping oil, which affects the lubricity between the parts of the pump body and increases mechanical friction and noise , leading to an increase in the power consumption of the compressor at low frequency operation, thereby reducing the energy efficiency ratio of the compressor

In order to improve the oil pumping effect of the compressor at low frequency operation, the existing structure sets the pump core inside the crankshaft, so that the pump core and the crankshaft form a nested structure. As the crankshaft rotates, the oil passes through the gap between the pump core and the crankshaft Upstream lubrication, if the concentricity between the pump core and the crankshaft is poor, the friction between the pump core and the oil pump will increase as the crankshaft runs at high speed

Therefore, although these structures reduce the friction loss of the oil pump, considering the inevitable dimensional deviation in the processing and assembly process and the plastic material of the screw oil pump, it will still lead to a certain degree of friction loss, and the accuracy of the oil pump will decrease in the long run; and currently The parts and components of most of the screw oil pump mechanisms put into production are complex in process, which consumes a lot of process costs, and the complexity of the assembly process also makes it almost impossible to automate the assembly process

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