Rotary compressor and its crankshaft

Abstract

The invention discloses a rotary compressor and its crankshaft. The crankshaft comprises a main shaft part and an eccentric part formed on the main shaft part. A trimming part is formed on the eccentric part. The trimming part passes through the upper end face of the eccentric part or passes through the lower end face of the eccentric part. According to the crankshaft of the embodiment and under the precondition of keeping eccentric magnitude of the crankshaft unchanged, eccentric mass of the crankshaft is mitigated, and distance from the center of gravity of the crankshaft to the rotating center axis is shortened. Meanwhile, rotating eccentric inertia force of the rotary compressor with the application of the crankshaft is minimized, vibration and noise of the compressor are decreased, and long-term running reliability of the compressor is raised. In addition, with the decreasing of the rotating eccentric inertia force, it can be convenient to reduce weight of a balancing piece inside the compressor and even avoid the use of the balancing piece so as to reduce manufacturing cost of the compressor. And air resistance applied on the balancing piece can be reduced during operation, and energy efficiency of the compressor can be enhanced.

Description

technical field [0001] The invention relates to the field of compressors, in particular to a rotary compressor and a crankshaft thereof. Background technique [0002] For rotary compressors, the main working part is the rolling piston nested on the eccentric crankshaft. When the compressor motor is powered on, the eccentric crankshaft connected to the motor rotor will drive the rolling piston to do eccentric movement in the compression chamber of the pump body. Thereby realizing the compression of the refrigerant gas. This type of mechanism is widely used in various refrigeration equipment technical fields due to its simple structure and high compression efficiency. [0003] Due to the eccentric rotation structure, the center of gravity of the moving parts is not on the rotating shaft, so the compressor will generate a rotational inertial force when it is running, and its direction points to the eccentric direction. The existence of eccentric inertial force will increase t...

AI Technical Summary

Problems solved by technology

Using this method can effectively reduce the noise and vibration of the compressor, but since the balance weight is installed on the motor rotor, in order to avoid the decline of the motor efficiency, the requirements for the magnetic permeability of the balance weight material are relatively strict, resulting in high cost of the balance weight material

In addition, after the balance weight is added to the motor rotor, the balance weight will be subjected to a large gas force during the operation of the compressor, which will increase the running resistance of the compressor, resulting in a decrease in the energy efficiency of the compressor, and even the high-speed rotation of the compressor. The middle balance weight produces a large inertial force, which will also increase the wear between the crankshaft and the bearing when the inertial force acts on the crankshaft

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