Crank dynamic balance self-adaptive dynamic balancing device

Abstract

The invention discloses a crank dynamic balance self-adaptive dynamic balancing device which comprises a crank and a balance block. A balancing weight is riveted to the balance block. A groove is formed in the outer side face, away from the crank, of the balance block. A plurality of vertical stop pieces are arranged on the side, close to the balance block, of the balancing weight. Inner holes areformed in the positions, corresponding to the vertical stop pieces, of the side wall of the balance block. An elastic connecting piece is arranged between the balancing weight and the balance block.The elastic connecting piece comprises tension springs arranged in the inner holes or a leaf spring on the balancing weight. When a compressor is in the operaion process, the dynamic balancing devicecan self-adaptively adjust the position of the balancing weight on the balance block according to different rotating speeds, and therefore the gravity center of the crank is changed, the inertia forcegenerated by the mechanism is counteracted, the whole crank reaches balance, and the vibration, noise, fatigue damage and other phenomena generated in the operation process of the compressor can be reduced through the self-adaptive dynamic balancing device.

Description

technical field [0001] The invention relates to the technical field of compressor crankshafts, in particular to a crankshaft dynamic balance adaptive dynamic balance device. Background technique [0002] The refrigerator compressor drives the crankshaft to rotate through the motor, and the crankshaft makes the piston reciprocate through the connecting rod, so as to realize the transformation of low-temperature and low-pressure refrigerant vapor into high-temperature and high-pressure refrigerant, so that the cycle of pushing the working medium forms a refrigeration cycle. Inertial forces exist in all machines that have mass, the center of mass of components has acceleration, or the components have angular acceleration. Theoretically, the compressor is a crank-slider mechanism. During its movement, in addition to being affected by external loads such as the gas force in the compressor cylinder, it is also affected by the inertial force generated by its components themselves i...

AI Technical Summary

Problems solved by technology

For example, the Chinese utility model patent (notification number: CN206206123U) disclosed a crankshaft for refrigeration compressors in 2017. The balance weight of the crankshaft is connected with 1 to 2 counterweights by rivets to increase the stability of the crankshaft. However, the counterweight and the balance weight are relatively fixed, and the center of gravity remains basically unchanged. It cannot be adaptively matched and adjusted according to the crankshaft speed, and the elimination of inertial force is not good.

[0005] There is also a way to change the crankshaft counterweight by adding an adaptive counterweight component to the crankshaft. For example, in 2018, a Chinese utility model patent (notification number: CN207728512U) disclosed a refrigerator variable frequency compressor crankshaft self-adaptive counterweight component, including a crankshaft, Cylindrical shell, counterweight and spring. The crankshaft includes a main shaft and an eccentric shaft connected to the main shaft. One side of the cylindrical shell is assembled and connected to the eccentric shaft. The cylindrical shell is arranged coaxially with the main shaft. The other side of the cylindrical shell is inside The sliding connection has a counterweight, and the counterweight is connected to the cylindrical shell through a spring; the self-adaptive counterweight component can self-adaptively balance the inertial force, but the structure is complicated, which is equivalent to adding a shell to the original crankshaft, which will inevitably affect The arrangement of other components in the compressor increases the volume of the compressor; and during the high-speed rotation of the crankshaft and the compression and deformation of the spring, the spring may fall off

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